meter: improve meter usage across micro framework (#409)

Reviewed-on: #409
Co-authored-by: Vasiliy Tolstov <v.tolstov@unistack.org>
Co-committed-by: Vasiliy Tolstov <v.tolstov@unistack.org>

.github.old/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,24 @@
+---
+name: Bug report
+about: For reporting bugs in go-micro
+title: "[BUG]"
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+
+1. What are you trying to do?
+2. What did you expect to happen?
+3. What happens instead?
+
+**How to reproduce the bug:**
+
+If possible, please include a minimal code snippet here.
+
+**Environment:**
+Go Version: please paste `go version` output here
+```
+please paste `go env` output here
+```

.github.old/ISSUE_TEMPLATE/feature-request---enhancement.md

@@ -0,0 +1,17 @@
+---
+name: Feature request / Enhancement
+about: If you have a need not served by go-micro
+title: "[FEATURE]"
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github.old/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,14 @@
+---
+name: Question
+about: Ask a question about go-micro
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+Before asking, please check if your question has already been answered: 
+
+1. Check the documentation - https://micro.mu/docs/
+2. Check the examples and plugins - https://github.com/micro/examples & https://github.com/micro/go-plugins
+3. Search existing issues

.github.old/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,9 @@
+## Pull Request template
+Please, go through these steps before clicking submit on this PR.
+
+1. Give a descriptive title to your PR.
+2. Provide a description of your changes.
+3. Make sure you have some relevant tests.
+4. Put `closes #XXXX` in your comment to auto-close the issue that your PR fixes (if applicable).
+
+**PLEASE REMOVE THIS TEMPLATE BEFORE SUBMITTING**

.github.old/dependabot.yml

@@ -0,0 +1,26 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    commit-message:
+      prefix: "chore"
+      include: "scope"
+
+  # Maintain dependencies for Golang
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    commit-message:
+      prefix: "chore"
+      include: "scope"
+

.github.old/workflows/autoapprove.yml

@@ -0,0 +1,24 @@
+name: "autoapprove"
+
+on:
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
+  workflow_run:
+    workflows: ["prbuild"]
+    types:
+      - completed
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  autoapprove:
+    runs-on: ubuntu-latest
+    steps:
+      - name: approve
+        uses: hmarr/auto-approve-action@v3
+        if: github.actor == 'vtolstov' || github.actor == 'dependabot[bot]'
+        id: approve
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}

.github.old/workflows/automerge.yml

@@ -0,0 +1,21 @@
+name: "automerge"
+
+on:
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  automerge:
+    runs-on: ubuntu-latest
+    if: github.actor == 'vtolstov'
+    steps:
+      - name: merge
+        id: merge
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.TOKEN}}

.github.old/workflows/build.yml

@@ -0,0 +1,47 @@
+name: build
+on:
+ push:
+    branches:
+    - master
+    - v3
+jobs:
+  test:
+    name: test
+    runs-on: ubuntu-latest
+    steps:
+    - name: setup
+      uses: actions/setup-go@v3
+      with:
+        go-version: 1.17
+    - name: checkout
+      uses: actions/checkout@v3
+    - name: cache
+      uses: actions/cache@v3
+      with:
+        path: ~/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: ${{ runner.os }}-go-
+    - name: deps
+      run: go get -v -t -d ./...
+    - name: test
+      env:
+        INTEGRATION_TESTS: yes
+      run: go test -mod readonly -v ./...
+  lint:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v3
+      - name: lint
+        uses: golangci/golangci-lint-action@v3.4.0
+        continue-on-error: true
+        with:
+          # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.
+          version: v1.30
+          # Optional: working directory, useful for monorepos
+          # working-directory: somedir
+          # Optional: golangci-lint command line arguments.
+          # args: --issues-exit-code=0
+          # Optional: show only new issues if it's a pull request. The default value is `false`.
+          # only-new-issues: true

.github.old/workflows/codecov.yml

@@ -0,0 +1,39 @@
+name: "codecov"
+
+on:
+  workflow_run:
+    workflows: ["build"]
+    types:
+      - completed
+  push:
+    branches: [ v3 ]
+  pull_request:
+    branches: [ v3 ]
+  schedule:
+    - cron: '34 1 * * 0'
+
+jobs:
+  codecov:
+    name: codecov
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'go' ]
+
+    steps:
+    - name: checkout
+      uses: actions/checkout@v3
+    - name: setup
+      uses: actions/setup-go@v3
+      with:
+        go-version: 1.17
+    - name: Run coverage
+      run: go test -v -race -coverprofile=coverage.out -covermode=atomic ./...
+    - name: codecov
+      uses: codecov/codecov-action@v3.1.1

.github.old/workflows/codeql-analysis.yml

@@ -0,0 +1,78 @@
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "codeql"
+
+on:
+  workflow_run:
+    workflows: ["prbuild"]
+    types:
+      - completed
+  push:
+    branches: [ master, v3 ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ master, v3 ]
+  schedule:
+    - cron: '34 1 * * 0'
+
+jobs:
+  analyze:
+    name: analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'go' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
+        # Learn more:
+        # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
+
+    steps:
+    - name: checkout
+      uses: actions/checkout@v3
+    - name: setup
+      uses: actions/setup-go@v3
+      with:
+        go-version: 1.17
+    # Initializes the CodeQL tools for scanning.
+    - name: init
+      uses: github/codeql-action/init@v2
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: autobuild
+      uses: github/codeql-action/autobuild@v2
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 https://git.io/JvXDl
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+
+    - name: analyze
+      uses: github/codeql-action/analyze@v2

.github.old/workflows/dependabot-automerge.yml

@@ -0,0 +1,27 @@
+name: "dependabot-automerge"
+
+on:
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  automerge:
+    runs-on: ubuntu-latest
+    if: github.actor == 'dependabot[bot]'
+    steps:
+      - name: metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v1.3.6
+        with:
+          github-token: "${{ secrets.TOKEN }}"
+      - name: merge
+        id: merge
+        if: ${{contains(steps.metadata.outputs.dependency-names, 'go.unistack.org')}}
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.TOKEN}}

.github.old/workflows/pr.yml

@@ -0,0 +1,40 @@
+name: prbuild
+on:
+  pull_request:
+    branches:
+    - master
+    - v3
+jobs:
+  test:
+    name: test
+    runs-on: ubuntu-latest
+    steps:
+    - name: setup
+      uses: actions/setup-go@v3
+      with:
+        go-version: 1.17
+    - name: checkout
+      uses: actions/checkout@v3
+    - name: cache
+      uses: actions/cache@v3
+      with:
+        path: ~/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: ${{ runner.os }}-go-
+    - name: deps
+      run: go get -v -t -d ./...
+    - name: test
+      env:
+        INTEGRATION_TESTS: yes
+      run: go test -mod readonly -v ./...
+  lint:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v3
+      - name: lint
+        uses: golangci/golangci-lint-action@v3.4.0
+        continue-on-error: true
+        with:
+          version: v1.30

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,18 @@
+---
+name: Bug report
+about: For reporting bugs in micro
+title: "[BUG]"
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+
+1. What are you trying to do?
+2. What did you expect to happen?
+3. What happens instead?
+
+**How to reproduce the bug:**
+
+If possible, please include a minimal code snippet here.

.github/ISSUE_TEMPLATE/feature-request---enhancement.md

@@ -0,0 +1,17 @@
+---
+name: Feature request / Enhancement
+about: If you have a need not served by micro
+title: "[FEATURE]"
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,8 @@
+---
+name: Question
+about: Ask a question about micro
+title: ''
+labels: ''
+assignees: ''
+
+---

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,9 @@
+## Pull Request template
+Please, go through these steps before clicking submit on this PR.
+
+1. Give a descriptive title to your PR.
+2. Provide a description of your changes.
+3. Make sure you have some relevant tests.
+4. Put `closes #XXXX` in your comment to auto-close the issue that your PR fixes (if applicable).
+
+**PLEASE REMOVE THIS TEMPLATE BEFORE SUBMITTING**

.github/autoapprove.yml

@@ -0,0 +1,28 @@
+name: "autoapprove"
+
+on:
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
+  workflow_run:
+    workflows: ["prbuild"]
+    types:
+      - completed
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  autoapprove:
+    runs-on: ubuntu-latest
+    steps:
+      - name: approve
+        run: [ "curl -o tea https://dl.gitea.com/tea/main/tea-main-linux-amd64",
+               "chmod +x ./tea",
+               "./tea login add --name unistack --token ${{ secrets.GITHUB_TOKEN }} --url https://git.unistack.org",
+               "./tea pr --repo ${{ github.event.repository.name }}"
+        ]
+        if: github.actor == 'vtolstov'
+        id: approve
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/job_coverage.yml

@@ -0,0 +1,53 @@
+name: coverage
+
+on:
+  push:
+    branches: [ main, v3, v4 ]
+    paths-ignore:
+      - '.github/**'
+      - '.gitea/**'
+  pull_request:
+    branches: [ main, v3, v4 ]
+
+jobs:
+
+  build:
+    if: github.server_url != 'https://github.com'
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v4
+      with:
+        filter: 'blob:none'
+
+    - name: setup go
+      uses: actions/setup-go@v5
+      with:
+        cache-dependency-path: "**/*.sum"
+        go-version: 'stable'
+
+    - name: test coverage
+      run: |
+        go test -v -cover ./... -covermode=count -coverprofile coverage.out -coverpkg ./...
+        go tool cover -func coverage.out -o coverage.out
+
+    - name: coverage badge
+      uses: tj-actions/coverage-badge-go@v2
+      with:
+        green: 80
+        filename: coverage.out
+
+    - uses: stefanzweifel/git-auto-commit-action@v4
+      name: autocommit
+      with:
+        commit_message: Apply Code Coverage Badge
+        skip_fetch: false
+        skip_checkout: false
+        file_pattern: ./README.md
+
+    - name: push
+      if: steps.auto-commit-action.outputs.changes_detected == 'true'
+      uses: ad-m/github-push-action@master
+      with:
+        github_token: ${{ github.token }}
+        branch: ${{ github.ref }}

.github/workflows/job_lint.yml

@@ -0,0 +1,29 @@
+name: lint
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    branches: [ master, v3, v4 ]
+    paths-ignore:
+      - '.github/**'
+      - '.gitea/**'
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v4
+      with:
+        filter: 'blob:none'
+    - name: setup go
+      uses: actions/setup-go@v5
+      with:
+        cache-dependency-path: "**/*.sum"
+        go-version: 'stable'
+    - name: setup deps
+      run: go get -v ./...
+    - name: run lint
+      uses: golangci/golangci-lint-action@v6
+      with:
+        version: 'latest'

.github/workflows/job_sync.yml

@@ -0,0 +1,94 @@
+name: sync
+
+on:
+  schedule:
+    - cron: '*/5 * * * *'
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  sync:
+    if: github.server_url != 'https://github.com'
+    runs-on: ubuntu-latest
+    steps:
+    - name: init
+      run: |
+        git config --global user.email "vtolstov <vtolstov@users.noreply.github.com>"
+        git config --global user.name "github-actions[bot]"
+        echo "machine git.unistack.org login vtolstov password ${{ secrets.TOKEN_GITEA }}" >> /root/.netrc
+        echo "machine github.com login vtolstov password ${{ secrets.TOKEN_GITHUB }}" >> /root/.netrc
+
+    - name: check master
+      id: check_master
+      run: |
+        src_hash=$(git ls-remote https://github.com/${GITHUB_REPOSITORY} refs/heads/master | cut -f1)
+        dst_hash=$(git ls-remote ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} refs/heads/master | cut -f1)
+        echo "src_hash=$src_hash"
+        echo "dst_hash=$dst_hash"
+        if [ "$src_hash" != "$dst_hash" ]; then
+          echo "sync_needed=true" >> $GITHUB_OUTPUT
+        else
+          echo "sync_needed=false" >> $GITHUB_OUTPUT
+        fi
+
+    - name: sync master
+      if: steps.check_master.outputs.sync_needed == 'true'
+      run: |
+        git clone --filter=blob:none --filter=tree:0 --branch master --single-branch ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} repo
+        cd repo
+        git remote add --no-tags --fetch --track master upstream https://github.com/${GITHUB_REPOSITORY}
+        git pull --rebase upstream master
+        git push upstream master --progress
+        git push origin master --progress
+        cd ../
+        rm -rf repo
+
+    - name: check v3
+      id: check_v3
+      run: |
+        src_hash=$(git ls-remote https://github.com/${GITHUB_REPOSITORY} refs/heads/v3 | cut -f1)
+        dst_hash=$(git ls-remote ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} refs/heads/v3 | cut -f1)
+        echo "src_hash=$src_hash"
+        echo "dst_hash=$dst_hash"
+        if [ "$src_hash" != "$dst_hash" ]; then
+          echo "sync_needed=true" >> $GITHUB_OUTPUT
+        else
+          echo "sync_needed=false" >> $GITHUB_OUTPUT
+        fi
+
+    - name: sync v3
+      if: steps.check_v3.outputs.sync_needed == 'true'
+      run: |
+        git clone --filter=blob:none --filter=tree:0 --branch v3 --single-branch ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} repo
+        cd repo
+        git remote add --no-tags --fetch --track v3 upstream https://github.com/${GITHUB_REPOSITORY}
+        git pull --rebase upstream v3
+        git push upstream v3 --progress
+        git push origin v3 --progress
+        cd ../
+        rm -rf repo
+
+    - name: check v4
+      id: check_v4
+      run: |
+        src_hash=$(git ls-remote https://github.com/${GITHUB_REPOSITORY} refs/heads/v4 | cut -f1)
+        dst_hash=$(git ls-remote ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} refs/heads/v4 | cut -f1)
+        echo "src_hash=$src_hash"
+        echo "dst_hash=$dst_hash"
+        if [ "$src_hash" != "$dst_hash" ]; then
+          echo "sync_needed=true" >> $GITHUB_OUTPUT
+        else
+          echo "sync_needed=false" >> $GITHUB_OUTPUT
+        fi
+
+    - name: sync v4
+      if: steps.check_v4.outputs.sync_needed == 'true'
+      run: |
+        git clone --filter=blob:none --filter=tree:0 --branch v4 --single-branch ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} repo
+        cd repo
+        git remote add --no-tags --fetch --track v4 upstream https://github.com/${GITHUB_REPOSITORY}
+        git pull --rebase upstream v4
+        git push upstream v4 --progress
+        git push origin v4 --progress
+        cd ../
+        rm -rf repo

.github/workflows/job_test.yml

@@ -0,0 +1,31 @@
+name: test
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    branches: [ master, v3, v4 ]
+  push:
+    branches: [ master, v3, v4 ]
+    paths-ignore:
+      - '.github/**'
+      - '.gitea/**'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v4
+      with:
+        filter: 'blob:none'
+    - name: setup go
+      uses: actions/setup-go@v5
+      with:
+        cache-dependency-path: "**/*.sum"
+        go-version: 'stable'
+    - name: setup deps
+      run: go get -v ./...
+    - name: run test
+      env:
+        INTEGRATION_TESTS: yes
+      run: go test -mod readonly -v ./...

.github/workflows/job_tests.yml

@@ -0,0 +1,50 @@
+name: test
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    branches: [ master, v3, v4 ]
+  push:
+    branches: [ master, v3, v4 ]
+    paths-ignore:
+      - '.github/**'
+      - '.gitea/**'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v4
+      with:
+        filter: 'blob:none'
+    - name: checkout tests
+      uses: actions/checkout@v4
+      with:
+        ref: master
+        filter: 'blob:none'
+        repository: unistack-org/micro-tests
+        path: micro-tests
+    - name: setup go
+      uses: actions/setup-go@v5
+      with:
+        cache-dependency-path: "**/*.sum"
+        go-version: 'stable'
+    - name: setup go work
+      env:
+        GOWORK: ${{ github.workspace }}/go.work
+      run: |
+        go work init
+        go work use .
+        go work use micro-tests
+    - name: setup deps
+      env:
+        GOWORK: ${{ github.workspace }}/go.work
+      run: go get -v ./...
+    - name: run tests
+      env:
+        INTEGRATION_TESTS: yes
+        GOWORK: ${{ github.workspace }}/go.work
+      run: |
+        cd micro-tests
+        go test -mod readonly -v ./... || true

.gitignore

@@ -0,0 +1,39 @@
+# Develop tools
+/.vscode/
+/.idea/
+.idea
+.vscode
+
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Folders
+_obj
+_test
+_build
+.DS_Store
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+# Test binary, build with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# vim temp files
+*~
+*.swp
+*.swo

.golangci.yml

@@ -0,0 +1,5 @@
+run:
+  concurrency: 8
+  timeout: 5m
+  issues-exit-code: 1
+  tests: true

.travis.yml

@@ -1,7 +0,0 @@
-language: go
-go:
-- 1.10.x
-- 1.11.x
-notifications:
-  slack:
-    secure: aEvhLbhujaGaKSrOokiG3//PaVHTIrc3fBpoRbCRqfZpyq6WREoapJJhF+tIpWWOwaC9GmChbD6aHo/jMUgwKXVyPSaNjiEL87YzUUpL8B2zslNp1rgfTg/LrzthOx3Q1TYwpaAl3to0fuHUVFX4yMeC2vuThq7WSXgMMxFCtbc=

LICENSE

@@ -176,7 +176,8 @@
 
    END OF TERMS AND CONDITIONS
 
-   Copyright 2015 Asim Aslam.
+   Copyright 2015-2020 Asim Aslam.
+   Copyright 2019-2020 Unistack LLC.
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.

README.md

@@ -1,56 +1,43 @@
-# Go Micro [![License](https://img.shields.io/:license-apache-blue.svg)](https://opensource.org/licenses/Apache-2.0) [![GoDoc](https://godoc.org/github.com/micro/go-micro?status.svg)](https://godoc.org/github.com/micro/go-micro) [![Travis CI](https://api.travis-ci.org/micro/go-micro.svg?branch=master)](https://travis-ci.org/micro/go-micro) [![Go Report Card](https://goreportcard.com/badge/micro/go-micro)](https://goreportcard.com/report/github.com/micro/go-micro)
+# Micro
+![Coverage](https://img.shields.io/badge/Coverage-34.1%25-yellow)
+[![License](https://img.shields.io/:license-apache-blue.svg)](https://opensource.org/licenses/Apache-2.0)
+[![Doc](https://img.shields.io/badge/go.dev-reference-007d9c?logo=go&logoColor=white&style=flat-square)](https://pkg.go.dev/go.unistack.org/micro/v4?tab=overview)
+[![Status](https://git.unistack.org/unistack-org/micro/actions/workflows/job_tests.yml/badge.svg?branch=v4)](https://git.unistack.org/unistack-org/micro/actions?query=workflow%3Abuild+branch%3Av4+event%3Apush)
+[![Lint](https://goreportcard.com/badge/go.unistack.org/micro/v4)](https://goreportcard.com/report/go.unistack.org/micro/v4)
 
-Go Micro is a framework for micro service development.
+Micro is a standard library for microservices.
 
 ## Overview
 
-Go Micro provides the core requirements for distributed systems development including RPC and Event driven communication. 
-The **micro** philosophy is sane defaults with a pluggable architecture. We provide defaults to get you started quickly 
-but everything can be easily swapped out. 
-
-<img src="https://micro.mu/docs/images/go-micro.svg" />
-
-Plugins are available at [github.com/micro/go-plugins](https://github.com/micro/go-plugins).
-
-Follow us on [Twitter](https://twitter.com/microhq) or join the [Slack](http://slack.micro.mu/) community.
+Micro provides the core requirements for distributed systems development including RPC and Event driven communication. 
 
 ## Features
 
-Go Micro abstracts away the details of distributed systems. Here are the main features.
+Micro abstracts away the details of distributed systems. Here are the main features.
+
+- **Dynamic Config** - Load and hot reload dynamic config from anywhere. The config interface provides a way to load application 
+level config from any source such as env vars, cmdline, file, consul, vault... You can merge the sources and even define fallbacks.
+
+- **Data Storage** - A simple data store interface to read, write and delete records. It includes support for memory, file and 
+s3. State and persistence becomes a core requirement beyond prototyping and Micro looks to build that into the framework.
 
 - **Service Discovery** - Automatic service registration and name resolution. Service discovery is at the core of micro service 
-development. When service A needs to speak to service B it needs the location of that service. The default discovery mechanism is 
-multicast DNS (mdns), a zeroconf system. You can optionally set gossip using the SWIM protocol for p2p networks or consul for a
-resilient cloud-native setup.
-
-- **Load Balancing** - Client side load balancing built on service discovery. Once we have the addresses of any number of instances 
-of a service we now need a way to decide which node to route to. We use random hashed load balancing to provide even distribution 
-across the services and retry a different node if there's a problem. 
+development. When service A needs to speak to service B it needs the location of that service.
 
 - **Message Encoding** - Dynamic message encoding based on content-type. The client and server will use codecs along with content-type 
 to seamlessly encode and decode Go types for you. Any variety of messages could be encoded and sent from different clients. The client 
-and server handle this by default. This includes protobuf and json by default.
+and server handle this by default.
 
-- **Sync Streaming** - RPC based request/response with support for bidirectional streaming. We provide an abstraction for synchronous 
-communication. A request made to a service will be automatically resolved, load balanced, dialled and streamed. The default 
-transport is http/1.1 or http2 when tls is enabled.
+- **Async Messaging** - Pub/Sub is built in as a first class citizen for asynchronous communication and event driven architectures.
+Event notifications are a core pattern in micro service development.
 
-- **Async Messaging** - PubSub is built in as a first class citizen for asynchronous communication and event driven architectures. 
-Event notifications are a core pattern in micro service development. The default messaging is point-to-point http/1.1 or http2 when tls 
-is enabled.
+- **Synchronization** - Distributed systems are often built in an eventually consistent manner. Support for distributed locking and 
+leadership are built in as a Sync interface. When using an eventually consistent database or scheduling use the Sync interface.
 
-- **Pluggable Interfaces** - Go Micro makes use of Go interfaces for each distributed system abstraction. Because of this these interfaces 
-are pluggable and allows Go Micro to be runtime agnostic. You can plugin any underlying technology. Find plugins in 
-[github.com/micro/go-plugins](https://github.com/micro/go-plugins).
+- **Pluggable Interfaces** - Micro makes use of Go interfaces for each system abstraction. Because of this these interfaces 
+are pluggable and allows Micro to be runtime agnostic.
 
-## Getting Started
+## License
 
-See the [docs](https://micro.mu/docs/go-micro.html) for detailed information on the architecture, installation and use of go-micro.
+Micro is Apache 2.0 licensed.
 
-## Sponsors
-
-Sixt is an Enterprise Sponsor of Micro
-
-<a href="https://micro.mu/blog/2016/04/25/announcing-sixt-sponsorship.html"><img src="https://micro.mu/sixt_logo.png" width=150px height="auto" /></a>
-
-Become a sponsor by backing micro on [Patreon](https://www.patreon.com/microhq)

broker/broker.go

@@ -1,70 +1,91 @@
 // Package broker is an interface used for asynchronous messaging
 package broker
 
+import (
+	"context"
+	"errors"
+	"time"
+
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/metadata"
+)
+
+// DefaultBroker default memory broker
+var DefaultBroker Broker = NewBroker()
+
+var (
+	// ErrNotConnected returns when broker used but not connected yet
+	ErrNotConnected = errors.New("broker not connected")
+	// ErrDisconnected returns when broker disconnected
+	ErrDisconnected = errors.New("broker disconnected")
+	// ErrInvalidMessage returns when invalid Message passed
+	ErrInvalidMessage = errors.New("invalid message")
+	// ErrInvalidHandler returns when subscriber passed to Subscribe
+	ErrInvalidHandler = errors.New("invalid handler, ony func(Message) error and func([]Message) error supported")
+	// DefaultGracefulTimeout
+	DefaultGracefulTimeout = 5 * time.Second
+)
+
 // Broker is an interface used for asynchronous messaging.
 type Broker interface {
+	// Name returns broker instance name
+	Name() string
+	// Init initilize broker
+	Init(opts ...Option) error
+	// Options returns broker options
 	Options() Options
+	// Address return configured address
 	Address() string
-	Connect() error
-	Disconnect() error
-	Init(...Option) error
-	Publish(string, *Message, ...PublishOption) error
-	Subscribe(string, Handler, ...SubscribeOption) (Subscriber, error)
+	// Connect connects to broker
+	Connect(ctx context.Context) error
+	// Disconnect disconnect from broker
+	Disconnect(ctx context.Context) error
+	// NewMessage create new broker message to publish.
+	NewMessage(ctx context.Context, hdr metadata.Metadata, body interface{}, opts ...MessageOption) (Message, error)
+	// Publish message to broker topic
+	Publish(ctx context.Context, topic string, messages ...Message) error
+	// Subscribe subscribes to topic message via handler
+	Subscribe(ctx context.Context, topic string, handler interface{}, opts ...SubscribeOption) (Subscriber, error)
+	// String type of broker
 	String() string
+	// Live returns broker liveness
+	Live() bool
+	// Ready returns broker readiness
+	Ready() bool
+	// Health returns broker health
+	Health() bool
 }
 
-// Handler is used to process messages via a subscription of a topic.
-// The handler is passed a publication interface which contains the
-// message and optional Ack method to acknowledge receipt of the message.
-type Handler func(Publication) error
+type (
+	FuncPublish   func(ctx context.Context, topic string, messages ...Message) error
+	HookPublish   func(next FuncPublish) FuncPublish
+	FuncSubscribe func(ctx context.Context, topic string, handler interface{}, opts ...SubscribeOption) (Subscriber, error)
+	HookSubscribe func(next FuncSubscribe) FuncSubscribe
+)
 
-type Message struct {
-	Header map[string]string
-	Body   []byte
-}
-
-// Publication is given to a subscription handler for processing
-type Publication interface {
+// Message is given to a subscription handler for processing
+type Message interface {
+	// Context for the message.
+	Context() context.Context
+	// Topic returns message destination topic.
 	Topic() string
-	Message() *Message
+	// Header returns message headers.
+	Header() metadata.Metadata
+	// Body returns broker message []byte slice
+	Body() []byte
+	// Unmarshal try to decode message body to dst.
+	// This is helper method that uses codec.Unmarshal.
+	Unmarshal(dst interface{}, opts ...codec.Option) error
+	// Ack acknowledge message if supported.
 	Ack() error
 }
 
 // Subscriber is a convenience return type for the Subscribe method
 type Subscriber interface {
+	// Options returns subscriber options
 	Options() SubscribeOptions
+	// Topic returns topic for subscription
 	Topic() string
-	Unsubscribe() error
-}
-
-var (
-	DefaultBroker Broker = newHttpBroker()
-)
-
-func NewBroker(opts ...Option) Broker {
-	return newHttpBroker(opts...)
-}
-
-func Init(opts ...Option) error {
-	return DefaultBroker.Init(opts...)
-}
-
-func Connect() error {
-	return DefaultBroker.Connect()
-}
-
-func Disconnect() error {
-	return DefaultBroker.Disconnect()
-}
-
-func Publish(topic string, msg *Message, opts ...PublishOption) error {
-	return DefaultBroker.Publish(topic, msg, opts...)
-}
-
-func Subscribe(topic string, handler Handler, opts ...SubscribeOption) (Subscriber, error) {
-	return DefaultBroker.Subscribe(topic, handler, opts...)
-}
-
-func String() string {
-	return DefaultBroker.String()
+	// Unsubscribe from topic
+	Unsubscribe(ctx context.Context) error
 }

broker/context.go

@@ -0,0 +1,63 @@
+package broker
+
+import (
+	"context"
+)
+
+type brokerKey struct{}
+
+// FromContext returns broker from passed context
+func FromContext(ctx context.Context) (Broker, bool) {
+	if ctx == nil {
+		return nil, false
+	}
+	c, ok := ctx.Value(brokerKey{}).(Broker)
+	return c, ok
+}
+
+// MustContext returns broker from passed context
+func MustContext(ctx context.Context) Broker {
+	b, ok := FromContext(ctx)
+	if !ok {
+		panic("missing broker")
+	}
+	return b
+}
+
+// NewContext savess broker in context
+func NewContext(ctx context.Context, s Broker) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	return context.WithValue(ctx, brokerKey{}, s)
+}
+
+// SetSubscribeOption returns a function to setup a context with given value
+func SetSubscribeOption(k, v interface{}) SubscribeOption {
+	return func(o *SubscribeOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}
+
+// SetMessageOption returns a function to setup a context with given value
+func SetMessageOption(k, v interface{}) MessageOption {
+	return func(o *MessageOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}
+
+// SetOption returns a function to setup a context with given value
+func SetOption(k, v interface{}) Option {
+	return func(o *Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}

broker/context_test.go

@@ -0,0 +1,61 @@
+package broker
+
+import (
+	"context"
+	"testing"
+)
+
+func TestFromContext(t *testing.T) {
+	ctx := context.WithValue(context.TODO(), brokerKey{}, NewBroker())
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("FromContext not works")
+	}
+}
+
+func TestFromNilContext(t *testing.T) {
+	// nolint: staticcheck
+	c, ok := FromContext(nil)
+	if ok || c != nil {
+		t.Fatal("FromContext not works")
+	}
+}
+
+func TestNewContext(t *testing.T) {
+	ctx := NewContext(context.TODO(), NewBroker())
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}
+
+func TestNewNilContext(t *testing.T) {
+	// nolint: staticcheck
+	ctx := NewContext(nil, NewBroker())
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}
+
+func TestSetSubscribeOption(t *testing.T) {
+	type key struct{}
+	o := SetSubscribeOption(key{}, "test")
+	opts := &SubscribeOptions{}
+	o(opts)
+
+	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
+		t.Fatal("SetSubscribeOption not works")
+	}
+}
+
+func TestSetOption(t *testing.T) {
+	type key struct{}
+	o := SetOption(key{}, "test")
+	opts := &Options{}
+	o(opts)
+
+	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
+		t.Fatal("SetOption not works")
+	}
+}

broker/http/http.go

@@ -1,11 +0,0 @@
-// Package http provides a http based message broker
-package http
-
-import (
-	"github.com/micro/go-micro/broker"
-)
-
-// NewBroker returns a new http broker
-func NewBroker(opts ...broker.Option) broker.Broker {
-	return broker.NewBroker(opts...)
-}

broker/http/options.go

@@ -1,23 +0,0 @@
-package http
-
-import (
-	"context"
-	"net/http"
-
-	"github.com/micro/go-micro/broker"
-)
-
-// Handle registers the handler for the given pattern.
-func Handle(pattern string, handler http.Handler) broker.Option {
-	return func(o *broker.Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		handlers, ok := o.Context.Value("http_handlers").(map[string]http.Handler)
-		if !ok {
-			handlers = make(map[string]http.Handler)
-		}
-		handlers[pattern] = handler
-		o.Context = context.WithValue(o.Context, "http_handlers", handlers)
-	}
-}

broker/http_broker.go

@@ -1,680 +0,0 @@
-package broker
-
-import (
-	"bytes"
-	"context"
-	"crypto/tls"
-	"errors"
-	"fmt"
-	"io"
-	"io/ioutil"
-	"math/rand"
-	"net"
-	"net/http"
-	"net/url"
-	"runtime"
-	"strconv"
-	"strings"
-	"sync"
-	"time"
-
-	"github.com/google/uuid"
-	"github.com/micro/go-micro/codec/json"
-	merr "github.com/micro/go-micro/errors"
-	"github.com/micro/go-micro/registry"
-	"github.com/micro/go-rcache"
-	maddr "github.com/micro/util/go/lib/addr"
-	mnet "github.com/micro/util/go/lib/net"
-	mls "github.com/micro/util/go/lib/tls"
-	"golang.org/x/net/http2"
-)
-
-// HTTP Broker is a point to point async broker
-type httpBroker struct {
-	id      string
-	address string
-	opts    Options
-
-	mux *http.ServeMux
-
-	c *http.Client
-	r registry.Registry
-
-	sync.RWMutex
-	subscribers map[string][]*httpSubscriber
-	running     bool
-	exit        chan chan error
-
-	// offline message inbox
-	mtx   sync.RWMutex
-	inbox map[string][][]byte
-}
-
-type httpSubscriber struct {
-	opts  SubscribeOptions
-	id    string
-	topic string
-	fn    Handler
-	svc   *registry.Service
-	hb    *httpBroker
-}
-
-type httpPublication struct {
-	m *Message
-	t string
-}
-
-var (
-	DefaultSubPath   = "/_sub"
-	broadcastVersion = "ff.http.broadcast"
-	registerTTL      = time.Minute
-	registerInterval = time.Second * 30
-)
-
-func init() {
-	rand.Seed(time.Now().Unix())
-}
-
-func newTransport(config *tls.Config) *http.Transport {
-	if config == nil {
-		config = &tls.Config{
-			InsecureSkipVerify: true,
-		}
-	}
-
-	dialTLS := func(network string, addr string) (net.Conn, error) {
-		return tls.Dial(network, addr, config)
-	}
-
-	t := &http.Transport{
-		Proxy: http.ProxyFromEnvironment,
-		Dial: (&net.Dialer{
-			Timeout:   30 * time.Second,
-			KeepAlive: 30 * time.Second,
-		}).Dial,
-		TLSHandshakeTimeout: 10 * time.Second,
-		DialTLS:             dialTLS,
-	}
-	runtime.SetFinalizer(&t, func(tr **http.Transport) {
-		(*tr).CloseIdleConnections()
-	})
-
-	// setup http2
-	http2.ConfigureTransport(t)
-
-	return t
-}
-
-func newHttpBroker(opts ...Option) Broker {
-	options := Options{
-		Codec:   json.Marshaler{},
-		Context: context.TODO(),
-	}
-
-	for _, o := range opts {
-		o(&options)
-	}
-
-	// set address
-	addr := ":0"
-	if len(options.Addrs) > 0 && len(options.Addrs[0]) > 0 {
-		addr = options.Addrs[0]
-	}
-
-	// get registry
-	reg, ok := options.Context.Value(registryKey).(registry.Registry)
-	if !ok {
-		reg = registry.DefaultRegistry
-	}
-
-	h := &httpBroker{
-		id:          "broker-" + uuid.New().String(),
-		address:     addr,
-		opts:        options,
-		r:           reg,
-		c:           &http.Client{Transport: newTransport(options.TLSConfig)},
-		subscribers: make(map[string][]*httpSubscriber),
-		exit:        make(chan chan error),
-		mux:         http.NewServeMux(),
-		inbox:       make(map[string][][]byte),
-	}
-
-	// specify the message handler
-	h.mux.Handle(DefaultSubPath, h)
-
-	// get optional handlers
-	if h.opts.Context != nil {
-		handlers, ok := h.opts.Context.Value("http_handlers").(map[string]http.Handler)
-		if ok {
-			for pattern, handler := range handlers {
-				h.mux.Handle(pattern, handler)
-			}
-		}
-	}
-
-	return h
-}
-
-func (h *httpPublication) Ack() error {
-	return nil
-}
-
-func (h *httpPublication) Message() *Message {
-	return h.m
-}
-
-func (h *httpPublication) Topic() string {
-	return h.t
-}
-
-func (h *httpSubscriber) Options() SubscribeOptions {
-	return h.opts
-}
-
-func (h *httpSubscriber) Topic() string {
-	return h.topic
-}
-
-func (h *httpSubscriber) Unsubscribe() error {
-	return h.hb.unsubscribe(h)
-}
-
-func (h *httpBroker) saveMessage(topic string, msg []byte) {
-	h.mtx.Lock()
-	defer h.mtx.Unlock()
-
-	// get messages
-	c := h.inbox[topic]
-
-	// save message
-	c = append(c, msg)
-
-	// max length 64
-	if len(c) > 64 {
-		c = c[:64]
-	}
-
-	// save inbox
-	h.inbox[topic] = c
-}
-
-func (h *httpBroker) getMessage(topic string, num int) [][]byte {
-	h.mtx.Lock()
-	defer h.mtx.Unlock()
-
-	// get messages
-	c, ok := h.inbox[topic]
-	if !ok {
-		return nil
-	}
-
-	// more message than requests
-	if len(c) >= num {
-		msg := c[:num]
-		h.inbox[topic] = c[num:]
-		return msg
-	}
-
-	// reset inbox
-	h.inbox[topic] = nil
-
-	// return all messages
-	return c
-}
-
-func (h *httpBroker) subscribe(s *httpSubscriber) error {
-	h.Lock()
-	defer h.Unlock()
-
-	if err := h.r.Register(s.svc, registry.RegisterTTL(registerTTL)); err != nil {
-		return err
-	}
-
-	h.subscribers[s.topic] = append(h.subscribers[s.topic], s)
-	return nil
-}
-
-func (h *httpBroker) unsubscribe(s *httpSubscriber) error {
-	h.Lock()
-	defer h.Unlock()
-
-	var subscribers []*httpSubscriber
-
-	// look for subscriber
-	for _, sub := range h.subscribers[s.topic] {
-		// deregister and skip forward
-		if sub.id == s.id {
-			_ = h.r.Deregister(sub.svc)
-			continue
-		}
-		// keep subscriber
-		subscribers = append(subscribers, sub)
-	}
-
-	// set subscribers
-	h.subscribers[s.topic] = subscribers
-
-	return nil
-}
-
-func (h *httpBroker) run(l net.Listener) {
-	t := time.NewTicker(registerInterval)
-	defer t.Stop()
-
-	for {
-		select {
-		// heartbeat for each subscriber
-		case <-t.C:
-			h.RLock()
-			for _, subs := range h.subscribers {
-				for _, sub := range subs {
-					_ = h.r.Register(sub.svc, registry.RegisterTTL(registerTTL))
-				}
-			}
-			h.RUnlock()
-		// received exit signal
-		case ch := <-h.exit:
-			ch <- l.Close()
-			h.RLock()
-			for _, subs := range h.subscribers {
-				for _, sub := range subs {
-					_ = h.r.Deregister(sub.svc)
-				}
-			}
-			h.RUnlock()
-			return
-		}
-	}
-}
-
-func (h *httpBroker) ServeHTTP(w http.ResponseWriter, req *http.Request) {
-	if req.Method != "POST" {
-		err := merr.BadRequest("go.micro.broker", "Method not allowed")
-		http.Error(w, err.Error(), http.StatusMethodNotAllowed)
-		return
-	}
-	defer req.Body.Close()
-
-	req.ParseForm()
-
-	b, err := ioutil.ReadAll(req.Body)
-	if err != nil {
-		errr := merr.InternalServerError("go.micro.broker", "Error reading request body: %v", err)
-		w.WriteHeader(500)
-		w.Write([]byte(errr.Error()))
-		return
-	}
-
-	var m *Message
-	if err = h.opts.Codec.Unmarshal(b, &m); err != nil {
-		errr := merr.InternalServerError("go.micro.broker", "Error parsing request body: %v", err)
-		w.WriteHeader(500)
-		w.Write([]byte(errr.Error()))
-		return
-	}
-
-	topic := m.Header[":topic"]
-	delete(m.Header, ":topic")
-
-	if len(topic) == 0 {
-		errr := merr.InternalServerError("go.micro.broker", "Topic not found")
-		w.WriteHeader(500)
-		w.Write([]byte(errr.Error()))
-		return
-	}
-
-	p := &httpPublication{m: m, t: topic}
-	id := req.Form.Get("id")
-
-	h.RLock()
-	for _, subscriber := range h.subscribers[topic] {
-		if id == subscriber.id {
-			// sub is sync; crufty rate limiting
-			// so we don't hose the cpu
-			subscriber.fn(p)
-		}
-	}
-	h.RUnlock()
-}
-
-func (h *httpBroker) Address() string {
-	h.RLock()
-	defer h.RUnlock()
-	return h.address
-}
-
-func (h *httpBroker) Connect() error {
-	h.RLock()
-	if h.running {
-		h.RUnlock()
-		return nil
-	}
-	h.RUnlock()
-
-	h.Lock()
-	defer h.Unlock()
-
-	var l net.Listener
-	var err error
-
-	if h.opts.Secure || h.opts.TLSConfig != nil {
-		config := h.opts.TLSConfig
-
-		fn := func(addr string) (net.Listener, error) {
-			if config == nil {
-				hosts := []string{addr}
-
-				// check if its a valid host:port
-				if host, _, err := net.SplitHostPort(addr); err == nil {
-					if len(host) == 0 {
-						hosts = maddr.IPs()
-					} else {
-						hosts = []string{host}
-					}
-				}
-
-				// generate a certificate
-				cert, err := mls.Certificate(hosts...)
-				if err != nil {
-					return nil, err
-				}
-				config = &tls.Config{Certificates: []tls.Certificate{cert}}
-			}
-			return tls.Listen("tcp", addr, config)
-		}
-
-		l, err = mnet.Listen(h.address, fn)
-	} else {
-		fn := func(addr string) (net.Listener, error) {
-			return net.Listen("tcp", addr)
-		}
-
-		l, err = mnet.Listen(h.address, fn)
-	}
-
-	if err != nil {
-		return err
-	}
-
-	addr := h.address
-	h.address = l.Addr().String()
-
-	go http.Serve(l, h.mux)
-	go func() {
-		h.run(l)
-		h.Lock()
-		h.address = addr
-		h.Unlock()
-	}()
-
-	// get registry
-	reg, ok := h.opts.Context.Value(registryKey).(registry.Registry)
-	if !ok {
-		reg = registry.DefaultRegistry
-	}
-	// set rcache
-	h.r = rcache.New(reg)
-
-	// set running
-	h.running = true
-	return nil
-}
-
-func (h *httpBroker) Disconnect() error {
-
-	h.RLock()
-	if !h.running {
-		h.RUnlock()
-		return nil
-	}
-	h.RUnlock()
-
-	h.Lock()
-	defer h.Unlock()
-
-	// stop rcache
-	rc, ok := h.r.(rcache.Cache)
-	if ok {
-		rc.Stop()
-	}
-
-	// exit and return err
-	ch := make(chan error)
-	h.exit <- ch
-	err := <-ch
-
-	// set not running
-	h.running = false
-	return err
-}
-
-func (h *httpBroker) Init(opts ...Option) error {
-	h.RLock()
-	if h.running {
-		h.RUnlock()
-		return errors.New("cannot init while connected")
-	}
-	h.RUnlock()
-
-	h.Lock()
-	defer h.Unlock()
-
-	for _, o := range opts {
-		o(&h.opts)
-	}
-
-	if len(h.opts.Addrs) > 0 && len(h.opts.Addrs[0]) > 0 {
-		h.address = h.opts.Addrs[0]
-	}
-
-	if len(h.id) == 0 {
-		h.id = "broker-" + uuid.New().String()
-	}
-
-	// get registry
-	reg, ok := h.opts.Context.Value(registryKey).(registry.Registry)
-	if !ok {
-		reg = registry.DefaultRegistry
-	}
-
-	// get rcache
-	if rc, ok := h.r.(rcache.Cache); ok {
-		rc.Stop()
-	}
-
-	// set registry
-	h.r = rcache.New(reg)
-
-	// reconfigure tls config
-	if c := h.opts.TLSConfig; c != nil {
-		h.c = &http.Client{
-			Transport: newTransport(c),
-		}
-	}
-
-	return nil
-}
-
-func (h *httpBroker) Options() Options {
-	return h.opts
-}
-
-func (h *httpBroker) Publish(topic string, msg *Message, opts ...PublishOption) error {
-	// create the message first
-	m := &Message{
-		Header: make(map[string]string),
-		Body:   msg.Body,
-	}
-
-	for k, v := range msg.Header {
-		m.Header[k] = v
-	}
-
-	m.Header[":topic"] = topic
-
-	// encode the message
-	b, err := h.opts.Codec.Marshal(m)
-	if err != nil {
-		return err
-	}
-
-	// save the message
-	h.saveMessage(topic, b)
-
-	// now attempt to get the service
-	h.RLock()
-	s, err := h.r.GetService("topic:" + topic)
-	if err != nil {
-		h.RUnlock()
-		// ignore error
-		return nil
-	}
-	h.RUnlock()
-
-	pub := func(node *registry.Node, t string, b []byte) error {
-		scheme := "http"
-
-		// check if secure is added in metadata
-		if node.Metadata["secure"] == "true" {
-			scheme = "https"
-		}
-
-		vals := url.Values{}
-		vals.Add("id", node.Id)
-
-		uri := fmt.Sprintf("%s://%s:%d%s?%s", scheme, node.Address, node.Port, DefaultSubPath, vals.Encode())
-		r, err := h.c.Post(uri, "application/json", bytes.NewReader(b))
-		if err != nil {
-			return err
-		}
-
-		// discard response body
-		io.Copy(ioutil.Discard, r.Body)
-		r.Body.Close()
-		return nil
-	}
-
-	srv := func(s []*registry.Service, b []byte) {
-		for _, service := range s {
-			// only process if we have nodes
-			if len(service.Nodes) == 0 {
-				continue
-			}
-
-			switch service.Version {
-			// broadcast version means broadcast to all nodes
-			case broadcastVersion:
-				var success bool
-
-				// publish to all nodes
-				for _, node := range service.Nodes {
-					// publish async
-					if err := pub(node, topic, b); err == nil {
-						success = true
-					}
-				}
-
-				// save if it failed to publish at least once
-				if !success {
-					h.saveMessage(topic, b)
-				}
-			default:
-				// select node to publish to
-				node := service.Nodes[rand.Int()%len(service.Nodes)]
-
-				// publish async to one node
-				if err := pub(node, topic, b); err != nil {
-					// if failed save it
-					h.saveMessage(topic, b)
-				}
-			}
-		}
-	}
-
-	// do the rest async
-	go func() {
-		// get a third of the backlog
-		messages := h.getMessage(topic, 8)
-		delay := (len(messages) > 1)
-
-		// publish all the messages
-		for _, msg := range messages {
-			// serialize here
-			srv(s, msg)
-
-			// sending a backlog of messages
-			if delay {
-				time.Sleep(time.Millisecond * 100)
-			}
-		}
-	}()
-
-	return nil
-}
-
-func (h *httpBroker) Subscribe(topic string, handler Handler, opts ...SubscribeOption) (Subscriber, error) {
-	options := NewSubscribeOptions(opts...)
-
-	// parse address for host, port
-	parts := strings.Split(h.Address(), ":")
-	host := strings.Join(parts[:len(parts)-1], ":")
-	port, _ := strconv.Atoi(parts[len(parts)-1])
-
-	addr, err := maddr.Extract(host)
-	if err != nil {
-		return nil, err
-	}
-
-	// create unique id
-	id := h.id + "." + uuid.New().String()
-
-	var secure bool
-
-	if h.opts.Secure || h.opts.TLSConfig != nil {
-		secure = true
-	}
-
-	// register service
-	node := &registry.Node{
-		Id:      id,
-		Address: addr,
-		Port:    port,
-		Metadata: map[string]string{
-			"secure": fmt.Sprintf("%t", secure),
-		},
-	}
-
-	// check for queue group or broadcast queue
-	version := options.Queue
-	if len(version) == 0 {
-		version = broadcastVersion
-	}
-
-	service := &registry.Service{
-		Name:    "topic:" + topic,
-		Version: version,
-		Nodes:   []*registry.Node{node},
-	}
-
-	// generate subscriber
-	subscriber := &httpSubscriber{
-		opts:  options,
-		hb:    h,
-		id:    id,
-		topic: topic,
-		fn:    handler,
-		svc:   service,
-	}
-
-	// subscribe now
-	if err := h.subscribe(subscriber); err != nil {
-		return nil, err
-	}
-
-	// return the subscriber
-	return subscriber, nil
-}
-
-func (h *httpBroker) String() string {
-	return "http"
-}

broker/http_broker_test.go

@@ -1,351 +0,0 @@
-package broker
-
-import (
-	"sync"
-	"testing"
-	"time"
-
-	glog "github.com/go-log/log"
-	"github.com/google/uuid"
-	"github.com/micro/go-log"
-	"github.com/micro/go-micro/registry/memory"
-)
-
-func newTestRegistry() *memory.Registry {
-	r := memory.NewRegistry()
-	m := r.(*memory.Registry)
-	m.Setup()
-	return m
-}
-
-func sub(be *testing.B, c int) {
-	// set no op logger
-	log.SetLogger(glog.DefaultLogger)
-
-	be.StopTimer()
-	m := newTestRegistry()
-
-	b := NewBroker(Registry(m))
-	topic := uuid.New().String()
-
-	if err := b.Init(); err != nil {
-		be.Fatalf("Unexpected init error: %v", err)
-	}
-
-	if err := b.Connect(); err != nil {
-		be.Fatalf("Unexpected connect error: %v", err)
-	}
-
-	msg := &Message{
-		Header: map[string]string{
-			"Content-Type": "application/json",
-		},
-		Body: []byte(`{"message": "Hello World"}`),
-	}
-
-	var subs []Subscriber
-	done := make(chan bool, c)
-
-	for i := 0; i < c; i++ {
-		sub, err := b.Subscribe(topic, func(p Publication) error {
-			done <- true
-			m := p.Message()
-
-			if string(m.Body) != string(msg.Body) {
-				be.Fatalf("Unexpected msg %s, expected %s", string(m.Body), string(msg.Body))
-			}
-
-			return nil
-		}, Queue("shared"))
-		if err != nil {
-			be.Fatalf("Unexpected subscribe error: %v", err)
-		}
-		subs = append(subs, sub)
-	}
-
-	for i := 0; i < be.N; i++ {
-		be.StartTimer()
-		if err := b.Publish(topic, msg); err != nil {
-			be.Fatalf("Unexpected publish error: %v", err)
-		}
-		<-done
-		be.StopTimer()
-	}
-
-	for _, sub := range subs {
-		sub.Unsubscribe()
-	}
-
-	if err := b.Disconnect(); err != nil {
-		be.Fatalf("Unexpected disconnect error: %v", err)
-	}
-}
-
-func pub(be *testing.B, c int) {
-	// set no op logger
-	log.SetLogger(glog.DefaultLogger)
-
-	be.StopTimer()
-	m := newTestRegistry()
-	b := NewBroker(Registry(m))
-	topic := uuid.New().String()
-
-	if err := b.Init(); err != nil {
-		be.Fatalf("Unexpected init error: %v", err)
-	}
-
-	if err := b.Connect(); err != nil {
-		be.Fatalf("Unexpected connect error: %v", err)
-	}
-
-	msg := &Message{
-		Header: map[string]string{
-			"Content-Type": "application/json",
-		},
-		Body: []byte(`{"message": "Hello World"}`),
-	}
-
-	done := make(chan bool, c*4)
-
-	sub, err := b.Subscribe(topic, func(p Publication) error {
-		done <- true
-		m := p.Message()
-		if string(m.Body) != string(msg.Body) {
-			be.Fatalf("Unexpected msg %s, expected %s", string(m.Body), string(msg.Body))
-		}
-		return nil
-	}, Queue("shared"))
-	if err != nil {
-		be.Fatalf("Unexpected subscribe error: %v", err)
-	}
-
-	var wg sync.WaitGroup
-	ch := make(chan int, c*4)
-	be.StartTimer()
-
-	for i := 0; i < c; i++ {
-		go func() {
-			for _ = range ch {
-				if err := b.Publish(topic, msg); err != nil {
-					be.Fatalf("Unexpected publish error: %v", err)
-				}
-				select {
-				case <-done:
-				case <-time.After(time.Second):
-				}
-				wg.Done()
-			}
-		}()
-	}
-
-	for i := 0; i < be.N; i++ {
-		wg.Add(1)
-		ch <- i
-	}
-
-	wg.Wait()
-	be.StopTimer()
-	sub.Unsubscribe()
-	close(ch)
-	close(done)
-
-	if err := b.Disconnect(); err != nil {
-		be.Fatalf("Unexpected disconnect error: %v", err)
-	}
-}
-
-func TestBroker(t *testing.T) {
-	m := newTestRegistry()
-	b := NewBroker(Registry(m))
-
-	if err := b.Init(); err != nil {
-		t.Fatalf("Unexpected init error: %v", err)
-	}
-
-	if err := b.Connect(); err != nil {
-		t.Fatalf("Unexpected connect error: %v", err)
-	}
-
-	msg := &Message{
-		Header: map[string]string{
-			"Content-Type": "application/json",
-		},
-		Body: []byte(`{"message": "Hello World"}`),
-	}
-
-	done := make(chan bool)
-
-	sub, err := b.Subscribe("test", func(p Publication) error {
-		m := p.Message()
-
-		if string(m.Body) != string(msg.Body) {
-			t.Fatalf("Unexpected msg %s, expected %s", string(m.Body), string(msg.Body))
-		}
-
-		close(done)
-		return nil
-	})
-	if err != nil {
-		t.Fatalf("Unexpected subscribe error: %v", err)
-	}
-
-	if err := b.Publish("test", msg); err != nil {
-		t.Fatalf("Unexpected publish error: %v", err)
-	}
-
-	<-done
-	sub.Unsubscribe()
-
-	if err := b.Disconnect(); err != nil {
-		t.Fatalf("Unexpected disconnect error: %v", err)
-	}
-}
-
-func TestConcurrentSubBroker(t *testing.T) {
-	m := newTestRegistry()
-	b := NewBroker(Registry(m))
-
-	if err := b.Init(); err != nil {
-		t.Fatalf("Unexpected init error: %v", err)
-	}
-
-	if err := b.Connect(); err != nil {
-		t.Fatalf("Unexpected connect error: %v", err)
-	}
-
-	msg := &Message{
-		Header: map[string]string{
-			"Content-Type": "application/json",
-		},
-		Body: []byte(`{"message": "Hello World"}`),
-	}
-
-	var subs []Subscriber
-	var wg sync.WaitGroup
-
-	for i := 0; i < 10; i++ {
-		sub, err := b.Subscribe("test", func(p Publication) error {
-			defer wg.Done()
-
-			m := p.Message()
-
-			if string(m.Body) != string(msg.Body) {
-				t.Fatalf("Unexpected msg %s, expected %s", string(m.Body), string(msg.Body))
-			}
-
-			return nil
-		})
-		if err != nil {
-			t.Fatalf("Unexpected subscribe error: %v", err)
-		}
-
-		wg.Add(1)
-		subs = append(subs, sub)
-	}
-
-	if err := b.Publish("test", msg); err != nil {
-		t.Fatalf("Unexpected publish error: %v", err)
-	}
-
-	wg.Wait()
-
-	for _, sub := range subs {
-		sub.Unsubscribe()
-	}
-
-	if err := b.Disconnect(); err != nil {
-		t.Fatalf("Unexpected disconnect error: %v", err)
-	}
-}
-
-func TestConcurrentPubBroker(t *testing.T) {
-	m := newTestRegistry()
-	b := NewBroker(Registry(m))
-
-	if err := b.Init(); err != nil {
-		t.Fatalf("Unexpected init error: %v", err)
-	}
-
-	if err := b.Connect(); err != nil {
-		t.Fatalf("Unexpected connect error: %v", err)
-	}
-
-	msg := &Message{
-		Header: map[string]string{
-			"Content-Type": "application/json",
-		},
-		Body: []byte(`{"message": "Hello World"}`),
-	}
-
-	var wg sync.WaitGroup
-
-	sub, err := b.Subscribe("test", func(p Publication) error {
-		defer wg.Done()
-
-		m := p.Message()
-
-		if string(m.Body) != string(msg.Body) {
-			t.Fatalf("Unexpected msg %s, expected %s", string(m.Body), string(msg.Body))
-		}
-
-		return nil
-	})
-	if err != nil {
-		t.Fatalf("Unexpected subscribe error: %v", err)
-	}
-
-	for i := 0; i < 10; i++ {
-		wg.Add(1)
-
-		if err := b.Publish("test", msg); err != nil {
-			t.Fatalf("Unexpected publish error: %v", err)
-		}
-	}
-
-	wg.Wait()
-
-	sub.Unsubscribe()
-
-	if err := b.Disconnect(); err != nil {
-		t.Fatalf("Unexpected disconnect error: %v", err)
-	}
-}
-
-func BenchmarkSub1(b *testing.B) {
-	sub(b, 1)
-}
-func BenchmarkSub8(b *testing.B) {
-	sub(b, 8)
-}
-
-func BenchmarkSub32(b *testing.B) {
-	sub(b, 32)
-}
-
-func BenchmarkSub64(b *testing.B) {
-	sub(b, 64)
-}
-
-func BenchmarkSub128(b *testing.B) {
-	sub(b, 128)
-}
-
-func BenchmarkPub1(b *testing.B) {
-	pub(b, 1)
-}
-
-func BenchmarkPub8(b *testing.B) {
-	pub(b, 8)
-}
-
-func BenchmarkPub32(b *testing.B) {
-	pub(b, 32)
-}
-
-func BenchmarkPub64(b *testing.B) {
-	pub(b, 64)
-}
-
-func BenchmarkPub128(b *testing.B) {
-	pub(b, 128)
-}

broker/memory/memory.go

@@ -1,180 +1,341 @@
-// Package memory provides a memory broker
-package memory
+package broker
 
 import (
-	"errors"
+	"context"
+	"strings"
 	"sync"
 
-	"github.com/google/uuid"
-	"github.com/micro/go-micro/broker"
+	"go.unistack.org/micro/v4/broker"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/options"
+	maddr "go.unistack.org/micro/v4/util/addr"
+	"go.unistack.org/micro/v4/util/id"
+	mnet "go.unistack.org/micro/v4/util/net"
+	"go.unistack.org/micro/v4/util/rand"
 )
 
-type memoryBroker struct {
-	opts broker.Options
-
-	sync.RWMutex
-	connected   bool
-	Subscribers map[string][]*memorySubscriber
+type Broker struct {
+	funcPublish   broker.FuncPublish
+	funcSubscribe broker.FuncSubscribe
+	subscribers   map[string][]*Subscriber
+	addr          string
+	opts          broker.Options
+	mu            sync.RWMutex
+	connected     bool
 }
 
-type memoryPublication struct {
-	topic   string
-	message *broker.Message
+type memoryMessage struct {
+	c     codec.Codec
+	topic string
+	ctx   context.Context
+	body  []byte
+	hdr   metadata.Metadata
+	opts  broker.MessageOptions
 }
 
-type memorySubscriber struct {
-	id      string
-	topic   string
-	exit    chan bool
-	handler broker.Handler
-	opts    broker.SubscribeOptions
+func (m *memoryMessage) Ack() error {
+	return nil
 }
 
-func (m *memoryBroker) Options() broker.Options {
-	return m.opts
+func (m *memoryMessage) Body() []byte {
+	return m.body
 }
 
-func (m *memoryBroker) Address() string {
+func (m *memoryMessage) Header() metadata.Metadata {
+	return m.hdr
+}
+
+func (m *memoryMessage) Context() context.Context {
+	return m.ctx
+}
+
+func (m *memoryMessage) Topic() string {
 	return ""
 }
 
-func (m *memoryBroker) Connect() error {
-	m.Lock()
-	defer m.Unlock()
+func (m *memoryMessage) Unmarshal(dst interface{}, opts ...codec.Option) error {
+	return m.c.Unmarshal(m.body, dst)
+}
 
-	if m.connected {
+type Subscriber struct {
+	ctx     context.Context
+	exit    chan bool
+	handler interface{}
+	id      string
+	topic   string
+	opts    broker.SubscribeOptions
+}
+
+func (b *Broker) newCodec(ct string) (codec.Codec, error) {
+	if idx := strings.IndexRune(ct, ';'); idx >= 0 {
+		ct = ct[:idx]
+	}
+	b.mu.RLock()
+	c, ok := b.opts.Codecs[ct]
+	b.mu.RUnlock()
+	if ok {
+		return c, nil
+	}
+	return nil, codec.ErrUnknownContentType
+}
+
+func (b *Broker) Options() broker.Options {
+	return b.opts
+}
+
+func (b *Broker) Address() string {
+	return b.addr
+}
+
+func (b *Broker) Connect(ctx context.Context) error {
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
+
+	b.mu.Lock()
+	defer b.mu.Unlock()
+
+	if b.connected {
 		return nil
 	}
 
-	m.connected = true
+	// use 127.0.0.1 to avoid scan of all network interfaces
+	addr, err := maddr.Extract("127.0.0.1")
+	if err != nil {
+		return err
+	}
+	var rng rand.Rand
+	i := rng.Intn(20000)
+	// set addr with port
+	addr = mnet.HostPort(addr, 10000+i)
+
+	b.addr = addr
+	b.connected = true
 
 	return nil
 }
 
-func (m *memoryBroker) Disconnect() error {
-	m.Lock()
-	defer m.Unlock()
+func (b *Broker) Disconnect(ctx context.Context) error {
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
 
-	if !m.connected {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+
+	if !b.connected {
 		return nil
 	}
 
-	m.connected = false
-
+	b.connected = false
 	return nil
 }
 
-func (m *memoryBroker) Init(opts ...broker.Option) error {
+func (b *Broker) Init(opts ...broker.Option) error {
 	for _, o := range opts {
-		o(&m.opts)
+		o(&b.opts)
 	}
+
+	b.funcPublish = b.fnPublish
+	b.funcSubscribe = b.fnSubscribe
+
+	b.opts.Hooks.EachPrev(func(hook options.Hook) {
+		switch h := hook.(type) {
+		case broker.HookPublish:
+			b.funcPublish = h(b.funcPublish)
+		case broker.HookSubscribe:
+			b.funcSubscribe = h(b.funcSubscribe)
+		}
+	})
+
 	return nil
 }
 
-func (m *memoryBroker) Publish(topic string, message *broker.Message, opts ...broker.PublishOption) error {
-	m.Lock()
-	defer m.Unlock()
-
-	if !m.connected {
-		return errors.New("not connected")
+func (b *Broker) NewMessage(ctx context.Context, hdr metadata.Metadata, body interface{}, opts ...broker.MessageOption) (broker.Message, error) {
+	options := broker.NewMessageOptions(opts...)
+	if options.ContentType == "" {
+		options.ContentType = b.opts.ContentType
+	}
+	m := &memoryMessage{ctx: ctx, hdr: hdr, opts: options}
+	c, err := b.newCodec(m.opts.ContentType)
+	if err == nil {
+		m.body, err = c.Marshal(body)
+	}
+	if err != nil {
+		return nil, err
 	}
 
-	subs, ok := m.Subscribers[topic]
+	return m, nil
+}
+
+func (b *Broker) Publish(ctx context.Context, topic string, messages ...broker.Message) error {
+	return b.funcPublish(ctx, topic, messages...)
+}
+
+func (b *Broker) fnPublish(ctx context.Context, topic string, messages ...broker.Message) error {
+	return b.publish(ctx, topic, messages...)
+}
+
+func (b *Broker) publish(ctx context.Context, topic string, messages ...broker.Message) error {
+	b.mu.RLock()
+	if !b.connected {
+		b.mu.RUnlock()
+		return broker.ErrNotConnected
+	}
+	b.mu.RUnlock()
+
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
+
+	b.mu.RLock()
+	subs, ok := b.subscribers[topic]
+	b.mu.RUnlock()
 	if !ok {
 		return nil
 	}
 
-	p := &memoryPublication{
-		topic:   topic,
-		message: message,
-	}
+	var err error
 
 	for _, sub := range subs {
-		if err := sub.handler(p); err != nil {
-			return err
+		switch s := sub.handler.(type) {
+		default:
+			if b.opts.Logger.V(logger.ErrorLevel) {
+				b.opts.Logger.Error(ctx, "broker  handler error", broker.ErrInvalidHandler)
+			}
+		case func(broker.Message) error:
+			for _, message := range messages {
+				msg, ok := message.(*memoryMessage)
+				if !ok {
+					if b.opts.Logger.V(logger.ErrorLevel) {
+						b.opts.Logger.Error(ctx, "broker handler error", broker.ErrInvalidMessage)
+					}
+				}
+				msg.topic = topic
+				if err = s(msg); err == nil && sub.opts.AutoAck {
+					err = msg.Ack()
+				}
+				if err != nil {
+					if b.opts.Logger.V(logger.ErrorLevel) {
+						b.opts.Logger.Error(ctx, "broker handler error", err)
+					}
+				}
+			}
+		case func([]broker.Message) error:
+			if err = s(messages); err == nil && sub.opts.AutoAck {
+				for _, message := range messages {
+					err = message.Ack()
+					if err != nil {
+						if b.opts.Logger.V(logger.ErrorLevel) {
+							b.opts.Logger.Error(ctx, "broker handler error", err)
+						}
+					}
+				}
+			}
 		}
 	}
 
 	return nil
 }
 
-func (m *memoryBroker) Subscribe(topic string, handler broker.Handler, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
-	m.Lock()
-	defer m.Unlock()
+func (b *Broker) Subscribe(ctx context.Context, topic string, handler interface{}, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
+	return b.funcSubscribe(ctx, topic, handler, opts...)
+}
 
-	if !m.connected {
-		return nil, errors.New("not connected")
+func (b *Broker) fnSubscribe(ctx context.Context, topic string, handler interface{}, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
+	if err := broker.IsValidHandler(handler); err != nil {
+		return nil, err
 	}
 
-	var options broker.SubscribeOptions
-	for _, o := range opts {
-		o(&options)
+	b.mu.RLock()
+	if !b.connected {
+		b.mu.RUnlock()
+		return nil, broker.ErrNotConnected
+	}
+	b.mu.RUnlock()
+
+	sid, err := id.New()
+	if err != nil {
+		return nil, err
 	}
 
-	sub := &memorySubscriber{
+	options := broker.NewSubscribeOptions(opts...)
+
+	sub := &Subscriber{
 		exit:    make(chan bool, 1),
-		id:      uuid.New().String(),
+		id:      sid,
 		topic:   topic,
 		handler: handler,
 		opts:    options,
+		ctx:     ctx,
 	}
 
-	m.Subscribers[topic] = append(m.Subscribers[topic], sub)
+	b.mu.Lock()
+	b.subscribers[topic] = append(b.subscribers[topic], sub)
+	b.mu.Unlock()
 
 	go func() {
 		<-sub.exit
-		m.Lock()
-		var newSubscribers []*memorySubscriber
-		for _, sb := range m.Subscribers[topic] {
+		b.mu.Lock()
+		newSubscribers := make([]*Subscriber, 0, len(b.subscribers)-1)
+		for _, sb := range b.subscribers[topic] {
 			if sb.id == sub.id {
 				continue
 			}
 			newSubscribers = append(newSubscribers, sb)
 		}
-		m.Subscribers[topic] = newSubscribers
-		m.Unlock()
+		b.subscribers[topic] = newSubscribers
+		b.mu.Unlock()
 	}()
 
 	return sub, nil
 }
 
-func (m *memoryBroker) String() string {
+func (b *Broker) String() string {
 	return "memory"
 }
 
-func (m *memoryPublication) Topic() string {
-	return m.topic
+func (b *Broker) Name() string {
+	return b.opts.Name
 }
 
-func (m *memoryPublication) Message() *broker.Message {
-	return m.message
+func (b *Broker) Live() bool {
+	return true
 }
 
-func (m *memoryPublication) Ack() error {
-	return nil
+func (b *Broker) Ready() bool {
+	return true
 }
 
-func (m *memorySubscriber) Options() broker.SubscribeOptions {
+func (b *Broker) Health() bool {
+	return true
+}
+
+func (m *Subscriber) Options() broker.SubscribeOptions {
 	return m.opts
 }
 
-func (m *memorySubscriber) Topic() string {
+func (m *Subscriber) Topic() string {
 	return m.topic
 }
 
-func (m *memorySubscriber) Unsubscribe() error {
+func (m *Subscriber) Unsubscribe(ctx context.Context) error {
 	m.exit <- true
 	return nil
 }
 
+// NewBroker return new memory broker
 func NewBroker(opts ...broker.Option) broker.Broker {
-	var options broker.Options
-	for _, o := range opts {
-		o(&options)
-	}
-
-	return &memoryBroker{
-		opts:        options,
-		Subscribers: make(map[string][]*memorySubscriber),
+	return &Broker{
+		opts:        broker.NewOptions(opts...),
+		subscribers: make(map[string][]*Subscriber),
 	}
 }

broker/memory/memory_test.go

@@ -1,50 +1,74 @@
-package memory
+package broker
 
 import (
+	"context"
 	"fmt"
 	"testing"
 
-	"github.com/micro/go-micro/broker"
+	"go.uber.org/atomic"
+	"go.unistack.org/micro/v4/broker"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/metadata"
 )
 
-func TestMemoryBroker(t *testing.T) {
-	b := NewBroker()
+type hldr struct {
+	c atomic.Int64
+}
 
-	if err := b.Connect(); err != nil {
+func (h *hldr) Handler(m broker.Message) error {
+	h.c.Add(1)
+	return nil
+}
+
+func TestMemoryBroker(t *testing.T) {
+	b := NewBroker(broker.Codec("application/octet-stream", codec.NewCodec()))
+	ctx := context.Background()
+
+	if err := b.Init(); err != nil {
+		t.Fatalf("Unexpected init error %v", err)
+	}
+
+	if err := b.Connect(ctx); err != nil {
 		t.Fatalf("Unexpected connect error %v", err)
 	}
 
 	topic := "test"
-	count := 10
+	count := int64(10)
 
-	fn := func(p broker.Publication) error {
-		return nil
-	}
+	h := &hldr{}
 
-	sub, err := b.Subscribe(topic, fn)
+	sub, err := b.Subscribe(ctx, topic, h.Handler)
 	if err != nil {
 		t.Fatalf("Unexpected error subscribing %v", err)
 	}
 
-	for i := 0; i < count; i++ {
-		message := &broker.Message{
-			Header: map[string]string{
-				"foo": "bar",
-				"id":  fmt.Sprintf("%d", i),
-			},
-			Body: []byte(`hello world`),
+	for i := int64(0); i < count; i++ {
+		message, err := b.NewMessage(ctx,
+			metadata.Pairs(
+				"foo", "bar",
+				"id", fmt.Sprintf("%d", i),
+			),
+			[]byte(`"hello world"`),
+			broker.MessageContentType("application/octet-stream"),
+		)
+		if err != nil {
+			t.Fatal(err)
 		}
 
-		if err := b.Publish(topic, message); err != nil {
-			t.Fatalf("Unexpected error publishing %d", i)
+		if err := b.Publish(ctx, topic, message); err != nil {
+			t.Fatalf("Unexpected error publishing %d err: %v", i, err)
 		}
 	}
 
-	if err := sub.Unsubscribe(); err != nil {
+	if err := sub.Unsubscribe(ctx); err != nil {
 		t.Fatalf("Unexpected error unsubscribing from %s: %v", topic, err)
 	}
 
-	if err := b.Disconnect(); err != nil {
+	if err := b.Disconnect(ctx); err != nil {
 		t.Fatalf("Unexpected connect error %v", err)
 	}
+
+	if h.c.Load() != count {
+		t.Fatal("invalid messages count received")
+	}
 }

broker/noop.go

@@ -0,0 +1,179 @@
+package broker
+
+import (
+	"context"
+	"strings"
+	"sync"
+
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/options"
+)
+
+type NoopBroker struct {
+	funcPublish   FuncPublish
+	funcSubscribe FuncSubscribe
+	opts          Options
+	mu            sync.RWMutex
+}
+
+func (b *NoopBroker) newCodec(ct string) (codec.Codec, error) {
+	if idx := strings.IndexRune(ct, ';'); idx >= 0 {
+		ct = ct[:idx]
+	}
+	b.mu.RLock()
+	c, ok := b.opts.Codecs[ct]
+	b.mu.RUnlock()
+	if ok {
+		return c, nil
+	}
+	return nil, codec.ErrUnknownContentType
+}
+
+func NewBroker(opts ...Option) *NoopBroker {
+	b := &NoopBroker{opts: NewOptions(opts...)}
+	b.funcPublish = b.fnPublish
+	b.funcSubscribe = b.fnSubscribe
+
+	return b
+}
+
+func (b *NoopBroker) Health() bool {
+	return true
+}
+
+func (b *NoopBroker) Live() bool {
+	return true
+}
+
+func (b *NoopBroker) Ready() bool {
+	return true
+}
+
+func (b *NoopBroker) Name() string {
+	return b.opts.Name
+}
+
+func (b *NoopBroker) String() string {
+	return "noop"
+}
+
+func (b *NoopBroker) Options() Options {
+	return b.opts
+}
+
+func (b *NoopBroker) Init(opts ...Option) error {
+	for _, opt := range opts {
+		opt(&b.opts)
+	}
+
+	b.funcPublish = b.fnPublish
+	b.funcSubscribe = b.fnSubscribe
+
+	b.opts.Hooks.EachPrev(func(hook options.Hook) {
+		switch h := hook.(type) {
+		case HookPublish:
+			b.funcPublish = h(b.funcPublish)
+		case HookSubscribe:
+			b.funcSubscribe = h(b.funcSubscribe)
+		}
+	})
+
+	return nil
+}
+
+func (b *NoopBroker) Connect(_ context.Context) error {
+	return nil
+}
+
+func (b *NoopBroker) Disconnect(_ context.Context) error {
+	return nil
+}
+
+func (b *NoopBroker) Address() string {
+	return strings.Join(b.opts.Addrs, ",")
+}
+
+type noopMessage struct {
+	c    codec.Codec
+	ctx  context.Context
+	body []byte
+	hdr  metadata.Metadata
+	opts MessageOptions
+}
+
+func (m *noopMessage) Ack() error {
+	return nil
+}
+
+func (m *noopMessage) Body() []byte {
+	return m.body
+}
+
+func (m *noopMessage) Header() metadata.Metadata {
+	return m.hdr
+}
+
+func (m *noopMessage) Context() context.Context {
+	return m.ctx
+}
+
+func (m *noopMessage) Topic() string {
+	return ""
+}
+
+func (m *noopMessage) Unmarshal(dst interface{}, opts ...codec.Option) error {
+	return m.c.Unmarshal(m.body, dst)
+}
+
+func (b *NoopBroker) NewMessage(ctx context.Context, hdr metadata.Metadata, body interface{}, opts ...MessageOption) (Message, error) {
+	options := NewMessageOptions(opts...)
+	if options.ContentType == "" {
+		options.ContentType = b.opts.ContentType
+	}
+	m := &noopMessage{ctx: ctx, hdr: hdr, opts: options}
+	c, err := b.newCodec(m.opts.ContentType)
+	if err == nil {
+		m.body, err = c.Marshal(body)
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	return m, nil
+}
+
+func (b *NoopBroker) fnPublish(_ context.Context, _ string, _ ...Message) error {
+	return nil
+}
+
+func (b *NoopBroker) Publish(ctx context.Context, topic string, msg ...Message) error {
+	return b.funcPublish(ctx, topic, msg...)
+}
+
+type NoopSubscriber struct {
+	ctx     context.Context
+	topic   string
+	handler interface{}
+	opts    SubscribeOptions
+}
+
+func (b *NoopBroker) fnSubscribe(ctx context.Context, topic string, handler interface{}, opts ...SubscribeOption) (Subscriber, error) {
+	return &NoopSubscriber{ctx: ctx, topic: topic, opts: NewSubscribeOptions(opts...), handler: handler}, nil
+}
+
+func (b *NoopBroker) Subscribe(ctx context.Context, topic string, handler interface{}, opts ...SubscribeOption) (Subscriber, error) {
+	return b.funcSubscribe(ctx, topic, handler, opts...)
+}
+
+func (s *NoopSubscriber) Options() SubscribeOptions {
+	return s.opts
+}
+
+func (s *NoopSubscriber) Topic() string {
+	return s.topic
+}
+
+func (s *NoopSubscriber) Unsubscribe(_ context.Context) error {
+	return nil
+}

broker/noop_test.go

@@ -0,0 +1,35 @@
+package broker
+
+import (
+	"context"
+	"testing"
+)
+
+type testHook struct {
+	f bool
+}
+
+func (t *testHook) Publish1(fn FuncPublish) FuncPublish {
+	return func(ctx context.Context, topic string, messages ...Message) error {
+		t.f = true
+		return fn(ctx, topic, messages...)
+	}
+}
+
+func TestNoopHook(t *testing.T) {
+	h := &testHook{}
+
+	b := NewBroker(Hooks(HookPublish(h.Publish1)))
+
+	if err := b.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := b.Publish(context.TODO(), "", nil); err != nil {
+		t.Fatal(err)
+	}
+
+	if !h.f {
+		t.Fatal("hook not works")
+	}
+}

broker/options.go

@@ -3,63 +3,146 @@ package broker
 import (
 	"context"
 	"crypto/tls"
+	"time"
 
-	"github.com/micro/go-micro/codec"
-	"github.com/micro/go-micro/registry"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/meter"
+	"go.unistack.org/micro/v4/options"
+	"go.unistack.org/micro/v4/register"
+	"go.unistack.org/micro/v4/sync"
+	"go.unistack.org/micro/v4/tracer"
 )
 
+// Options struct
 type Options struct {
-	Addrs     []string
-	Secure    bool
-	Codec     codec.Marshaler
+	// Name holds the broker name
+	Name string
+
+	// Tracer used for tracing
+	Tracer tracer.Tracer
+	// Register can be used for clustering
+	Register register.Register
+	// Codecs holds the codecs for marshal/unmarshal based on content-type
+	Codecs map[string]codec.Codec
+	// Logger used for logging
+	Logger logger.Logger
+	// Meter used for metrics
+	Meter meter.Meter
+	// Context holds external options
+	Context context.Context
+
+	// Wait waits for a collection of goroutines to finish
+	Wait *sync.WaitGroup
+	// TLSConfig holds tls.TLSConfig options
 	TLSConfig *tls.Config
-	// Other options for implementations of the interface
-	// can be stored in a context
-	Context context.Context
+
+	// Addrs holds the broker address
+	Addrs []string
+	// Hooks can be run before broker Publish/BatchPublish and
+	// Subscribe/BatchSubscribe methods
+	Hooks options.Hooks
+
+	// GracefulTimeout contains time to wait to finish in flight requests
+	GracefulTimeout time.Duration
+
+	// ContentType will be used if no content-type set when creating message
+	ContentType string
 }
 
-type PublishOptions struct {
-	// Other options for implementations of the interface
-	// can be stored in a context
-	Context context.Context
-}
-
-type SubscribeOptions struct {
-	// AutoAck defaults to true. When a handler returns
-	// with a nil error the message is acked.
-	AutoAck bool
-	// Subscribers with the same queue name
-	// will create a shared subscription where each
-	// receives a subset of messages.
-	Queue string
-
-	// Other options for implementations of the interface
-	// can be stored in a context
-	Context context.Context
-}
-
-type Option func(*Options)
-
-type PublishOption func(*PublishOptions)
-
-type SubscribeOption func(*SubscribeOptions)
-
-type contextKeyT string
-
-var (
-	registryKey = contextKeyT("github.com/micro/go-micro/registry")
-)
-
-func NewSubscribeOptions(opts ...SubscribeOption) SubscribeOptions {
-	opt := SubscribeOptions{
-		AutoAck: true,
+// NewOptions create new Options
+func NewOptions(opts ...Option) Options {
+	options := Options{
+		Register:        register.DefaultRegister,
+		Logger:          logger.DefaultLogger,
+		Context:         context.Background(),
+		Meter:           meter.DefaultMeter,
+		Codecs:          make(map[string]codec.Codec),
+		Tracer:          tracer.DefaultTracer,
+		GracefulTimeout: DefaultGracefulTimeout,
+		ContentType:     DefaultContentType,
 	}
 
 	for _, o := range opts {
-		o(&opt)
+		o(&options)
 	}
 
-	return opt
+	return options
+}
+
+// DefaultContentType is the default content-type if not specified
+var DefaultContentType = ""
+
+// Context sets the context option
+func Context(ctx context.Context) Option {
+	return func(o *Options) {
+		o.Context = ctx
+	}
+}
+
+// ContentType used by default if not specified
+func ContentType(ct string) Option {
+	return func(o *Options) {
+		o.ContentType = ct
+	}
+}
+
+// MessageOptions struct
+type MessageOptions struct {
+	// ContentType for message body
+	ContentType string
+	// BodyOnly flag says the message contains raw body bytes and don't need
+	// codec Marshal method
+	BodyOnly bool
+	// Context holds custom options
+	Context context.Context
+}
+
+// NewMessageOptions creates MessageOptions struct
+func NewMessageOptions(opts ...MessageOption) MessageOptions {
+	options := MessageOptions{
+		Context: context.Background(),
+	}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}
+
+// SubscribeOptions struct
+type SubscribeOptions struct {
+	// Context holds external options
+	Context context.Context
+	// Group holds consumer group
+	Group string
+	// AutoAck flag specifies auto ack of incoming message when no error happens
+	AutoAck bool
+	// BodyOnly flag specifies that message contains only body bytes without header
+	BodyOnly bool
+	// BatchSize flag specifies max batch size
+	BatchSize int
+	// BatchWait flag specifies max wait time for batch filling
+	BatchWait time.Duration
+}
+
+// Option func
+type Option func(*Options)
+
+// MessageOption func
+type MessageOption func(*MessageOptions)
+
+// MessageContentType sets message content-type that used to Marshal
+func MessageContentType(ct string) MessageOption {
+	return func(o *MessageOptions) {
+		o.ContentType = ct
+	}
+}
+
+// MessageBodyOnly publish only body of the message
+func MessageBodyOnly(b bool) MessageOption {
+	return func(o *MessageOptions) {
+		o.BodyOnly = b
+	}
 }
 
 // Addrs sets the host addresses to be used by the broker
@@ -69,52 +152,116 @@ func Addrs(addrs ...string) Option {
 	}
 }
 
-// Codec sets the codec used for encoding/decoding used where
-// a broker does not support headers
-func Codec(c codec.Marshaler) Option {
+// Codec sets the codec used for encoding/decoding messages
+func Codec(ct string, c codec.Codec) Option {
 	return func(o *Options) {
-		o.Codec = c
+		o.Codecs[ct] = c
 	}
 }
 
-// DisableAutoAck will disable auto acking of messages
-// after they have been handled.
-func DisableAutoAck() SubscribeOption {
+// SubscribeGroup sets the name of the queue to share messages on
+func SubscribeGroup(name string) SubscribeOption {
 	return func(o *SubscribeOptions) {
-		o.AutoAck = false
+		o.Group = name
 	}
 }
 
-// Queue sets the name of the queue to share messages on
-func Queue(name string) SubscribeOption {
-	return func(o *SubscribeOptions) {
-		o.Queue = name
-	}
-}
-
-func Registry(r registry.Registry) Option {
+// Register sets register option
+func Register(r register.Register) Option {
 	return func(o *Options) {
-		o.Context = context.WithValue(o.Context, registryKey, r)
+		o.Register = r
 	}
 }
 
-// Secure communication with the broker
-func Secure(b bool) Option {
-	return func(o *Options) {
-		o.Secure = b
-	}
-}
-
-// Specify TLS Config
+// TLSConfig sets the TLS Config
 func TLSConfig(t *tls.Config) Option {
 	return func(o *Options) {
 		o.TLSConfig = t
 	}
 }
 
+// Logger sets the logger
+func Logger(l logger.Logger) Option {
+	return func(o *Options) {
+		o.Logger = l
+	}
+}
+
+// Tracer to be used for tracing
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}
+
+// Meter sets the meter
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
+// Name sets the name
+func Name(n string) Option {
+	return func(o *Options) {
+		o.Name = n
+	}
+}
+
+// Hooks sets hook runs before action
+func Hooks(h ...options.Hook) Option {
+	return func(o *Options) {
+		o.Hooks = append(o.Hooks, h...)
+	}
+}
+
 // SubscribeContext set context
 func SubscribeContext(ctx context.Context) SubscribeOption {
 	return func(o *SubscribeOptions) {
 		o.Context = ctx
 	}
 }
+
+// SubscribeAutoAck contol auto acking of messages
+// after they have been handled.
+func SubscribeAutoAck(b bool) SubscribeOption {
+	return func(o *SubscribeOptions) {
+		o.AutoAck = b
+	}
+}
+
+// SubscribeBodyOnly consumes only body of the message
+func SubscribeBodyOnly(b bool) SubscribeOption {
+	return func(o *SubscribeOptions) {
+		o.BodyOnly = b
+	}
+}
+
+// SubscribeBatchSize specifies max batch size
+func SubscribeBatchSize(n int) SubscribeOption {
+	return func(o *SubscribeOptions) {
+		o.BatchSize = n
+	}
+}
+
+// SubscribeBatchWait specifies max batch wait time
+func SubscribeBatchWait(td time.Duration) SubscribeOption {
+	return func(o *SubscribeOptions) {
+		o.BatchWait = td
+	}
+}
+
+// SubscribeOption func
+type SubscribeOption func(*SubscribeOptions)
+
+// NewSubscribeOptions creates new SubscribeOptions
+func NewSubscribeOptions(opts ...SubscribeOption) SubscribeOptions {
+	options := SubscribeOptions{
+		AutoAck: true,
+		Context: context.Background(),
+	}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}

broker/subscriber.go

@@ -0,0 +1,14 @@
+package broker
+
+// IsValidHandler func signature
+func IsValidHandler(sub interface{}) error {
+	switch sub.(type) {
+	default:
+		return ErrInvalidHandler
+	case func(Message) error:
+		break
+	case func([]Message) error:
+		break
+	}
+	return nil
+}

client/backoff.go

@@ -4,14 +4,27 @@ import (
 	"context"
 	"math"
 	"time"
+
+	"go.unistack.org/micro/v4/util/backoff"
 )
 
+// BackoffFunc is the backoff call func
 type BackoffFunc func(ctx context.Context, req Request, attempts int) (time.Duration, error)
 
-// exponential backoff
-func exponentialBackoff(ctx context.Context, req Request, attempts int) (time.Duration, error) {
-	if attempts == 0 {
-		return time.Duration(0), nil
-	}
-	return time.Duration(math.Pow(10, float64(attempts))) * time.Millisecond, nil
+// BackoffExp using exponential backoff func
+func BackoffExp(_ context.Context, _ Request, attempts int) (time.Duration, error) {
+	return backoff.Do(attempts), nil
+}
+
+// BackoffInterval specifies randomization interval for backoff func
+func BackoffInterval(minTime time.Duration, maxTime time.Duration) BackoffFunc {
+	return func(_ context.Context, _ Request, attempts int) (time.Duration, error) {
+		td := time.Duration(math.Pow(float64(attempts), math.E)) * time.Millisecond * 100
+		if td < minTime {
+			return minTime, nil
+		} else if td > maxTime {
+			return maxTime, nil
+		}
+		return td, nil
+	}
 }

client/backoff_test.go

@@ -2,26 +2,55 @@ package client
 
 import (
 	"context"
-	"math"
 	"testing"
 	"time"
 )
 
-func TestBackoff(t *testing.T) {
-	delta := time.Duration(0)
+func TestBackoffExp(t *testing.T) {
+	results := []time.Duration{
+		0 * time.Second,
+		100 * time.Millisecond,
+		600 * time.Millisecond,
+		1900 * time.Millisecond,
+		4300 * time.Millisecond,
+		7900 * time.Millisecond,
+	}
 
-	c := NewClient()
+	r := &testRequest{
+		service: "test",
+		method:  "test",
+	}
 
 	for i := 0; i < 5; i++ {
-		d, err := exponentialBackoff(context.TODO(), c.NewRequest("test", "test", nil), i)
+		d, err := BackoffExp(context.TODO(), r, i)
 		if err != nil {
 			t.Fatal(err)
 		}
 
-		if d < delta {
-			t.Fatalf("Expected greater than %v, got %v", delta, d)
+		if d != results[i] {
+			t.Fatalf("Expected equal than %v, got %v", results[i], d)
+		}
+	}
+}
+
+func TestBackoffInterval(t *testing.T) {
+	minTime := 100 * time.Millisecond
+	maxTime := 300 * time.Millisecond
+
+	r := &testRequest{
+		service: "test",
+		method:  "test",
+	}
+
+	fn := BackoffInterval(minTime, maxTime)
+	for i := 0; i < 5; i++ {
+		d, err := fn(context.TODO(), r, i)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if d < minTime || d > maxTime {
+			t.Fatalf("Expected %v < %v < %v", minTime, d, maxTime)
 		}
-
-		delta = time.Millisecond * time.Duration(math.Pow(10, float64(i+1)))
 	}
 }

client/buffer.go

@@ -1,14 +0,0 @@
-package client
-
-import (
-	"bytes"
-)
-
-type buffer struct {
-	*bytes.Buffer
-}
-
-func (b *buffer) Close() error {
-	b.Buffer.Reset()
-	return nil
-}

client/client.go

@@ -5,34 +5,47 @@ import (
 	"context"
 	"time"
 
-	"github.com/micro/go-micro/codec"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/metadata"
+)
+
+var (
+	// DefaultClient is the global default client
+	DefaultClient = NewClient()
+	// DefaultContentType is the default content-type if not specified
+	DefaultContentType = ""
+	// DefaultBackoff is the default backoff function for retries (minimum 10 millisecond and maximum 5 second)
+	DefaultBackoff = BackoffInterval(10*time.Millisecond, 5*time.Second)
+	// DefaultRetry is the default check-for-retry function for retries
+	DefaultRetry = RetryNever
+	// DefaultRetries is the default number of times a request is tried
+	DefaultRetries = 0
+	// DefaultRequestTimeout is the default request timeout
+	DefaultRequestTimeout = time.Second * 5
+	// DefaultPoolSize sets the connection pool size
+	DefaultPoolSize = 100
+	// DefaultPoolTTL sets the connection pool ttl
+	DefaultPoolTTL = time.Minute
 )
 
 // Client is the interface used to make requests to services.
-// It supports Request/Response via Transport and Publishing via the Broker.
-// It also supports bidiectional streaming of requests.
+// It also supports bidirectional streaming of requests.
 type Client interface {
-	Init(...Option) error
+	Name() string
+	Init(opts ...Option) error
 	Options() Options
-	NewMessage(topic string, msg interface{}, opts ...MessageOption) Message
-	NewRequest(service, endpoint string, req interface{}, reqOpts ...RequestOption) Request
+	NewRequest(service string, endpoint string, req interface{}, opts ...RequestOption) Request
 	Call(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error
 	Stream(ctx context.Context, req Request, opts ...CallOption) (Stream, error)
-	Publish(ctx context.Context, msg Message, opts ...PublishOption) error
 	String() string
 }
 
-// Router manages request routing
-type Router interface {
-	SendRequest(context.Context, Request) (Response, error)
-}
-
-// Message is the interface for publishing asynchronously
-type Message interface {
-	Topic() string
-	Payload() interface{}
-	ContentType() string
-}
+type (
+	FuncCall   func(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error
+	HookCall   func(next FuncCall) FuncCall
+	FuncStream func(ctx context.Context, req Request, opts ...CallOption) (Stream, error)
+	HookStream func(next FuncStream) FuncStream
+)
 
 // Request is the interface for a synchronous request used by Call or Stream
 type Request interface {
@@ -47,7 +60,7 @@ type Request interface {
 	// The unencoded request body
 	Body() interface{}
 	// Write to the encoded request writer. This is nil before a call is made
-	Codec() codec.Writer
+	Codec() codec.Codec
 	// indicates whether the request will be a streaming one rather than unary
 	Stream() bool
 }
@@ -55,14 +68,14 @@ type Request interface {
 // Response is the response received from a service
 type Response interface {
 	// Read the response
-	Codec() codec.Reader
-	// read the header
-	Header() map[string]string
+	Codec() codec.Codec
+	// Header data
+	Header() metadata.Metadata
 	// Read the undecoded response
 	Read() ([]byte, error)
 }
 
-// Stream is the inteface for a bidirectional synchronous stream
+// Stream is the interface for a bidirectional synchronous stream
 type Stream interface {
 	// Context for the stream
 	Context() context.Context
@@ -71,13 +84,19 @@ type Stream interface {
 	// The response read
 	Response() Response
 	// Send will encode and send a request
-	Send(interface{}) error
+	Send(msg interface{}) error
 	// Recv will decode and read a response
-	Recv(interface{}) error
+	Recv(msg interface{}) error
+	// SendMsg will encode and send a request
+	SendMsg(msg interface{}) error
+	// RecvMsg will decode and read a response
+	RecvMsg(msg interface{}) error
 	// Error returns the stream error
 	Error() error
 	// Close closes the stream
 	Close() error
+	// CloseSend closes the send direction of the stream
+	CloseSend() error
 }
 
 // Option used by the Client
@@ -86,65 +105,5 @@ type Option func(*Options)
 // CallOption used by Call or Stream
 type CallOption func(*CallOptions)
 
-// PublishOption used by Publish
-type PublishOption func(*PublishOptions)
-
-// MessageOption used by NewMessage
-type MessageOption func(*MessageOptions)
-
 // RequestOption used by NewRequest
 type RequestOption func(*RequestOptions)
-
-var (
-	// DefaultClient is a default client to use out of the box
-	DefaultClient Client = newRpcClient()
-	// DefaultBackoff is the default backoff function for retries
-	DefaultBackoff = exponentialBackoff
-	// DefaultRetry is the default check-for-retry function for retries
-	DefaultRetry = RetryOnError
-	// DefaultRetries is the default number of times a request is tried
-	DefaultRetries = 1
-	// DefaultRequestTimeout is the default request timeout
-	DefaultRequestTimeout = time.Second * 5
-	// DefaultPoolSize sets the connection pool size
-	DefaultPoolSize = 100
-	// DefaultPoolTTL sets the connection pool ttl
-	DefaultPoolTTL = time.Minute
-)
-
-// Makes a synchronous call to a service using the default client
-func Call(ctx context.Context, request Request, response interface{}, opts ...CallOption) error {
-	return DefaultClient.Call(ctx, request, response, opts...)
-}
-
-// Publishes a publication using the default client. Using the underlying broker
-// set within the options.
-func Publish(ctx context.Context, msg Message, opts ...PublishOption) error {
-	return DefaultClient.Publish(ctx, msg, opts...)
-}
-
-// Creates a new message using the default client
-func NewMessage(topic string, payload interface{}, opts ...MessageOption) Message {
-	return DefaultClient.NewMessage(topic, payload, opts...)
-}
-
-// Creates a new client with the options passed in
-func NewClient(opt ...Option) Client {
-	return newRpcClient(opt...)
-}
-
-// Creates a new request using the default client. Content Type will
-// be set to the default within options and use the appropriate codec
-func NewRequest(service, endpoint string, request interface{}, reqOpts ...RequestOption) Request {
-	return DefaultClient.NewRequest(service, endpoint, request, reqOpts...)
-}
-
-// Creates a streaming connection with a service and returns responses on the
-// channel passed in. It's up to the user to close the streamer.
-func NewStream(ctx context.Context, request Request, opts ...CallOption) (Stream, error) {
-	return DefaultClient.Stream(ctx, request, opts...)
-}
-
-func String() string {
-	return DefaultClient.String()
-}

client/client_call_options.go

@@ -0,0 +1,23 @@
+package client
+
+import (
+	"context"
+)
+
+type clientCallOptions struct {
+	Client
+	opts []CallOption
+}
+
+func (s *clientCallOptions) Call(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error {
+	return s.Client.Call(ctx, req, rsp, append(s.opts, opts...)...)
+}
+
+func (s *clientCallOptions) Stream(ctx context.Context, req Request, opts ...CallOption) (Stream, error) {
+	return s.Client.Stream(ctx, req, append(s.opts, opts...)...)
+}
+
+// NewClientCallOptions add CallOption to every call
+func NewClientCallOptions(c Client, opts ...CallOption) Client {
+	return &clientCallOptions{c, opts}
+}

client/context.go

@@ -6,11 +6,48 @@ import (
 
 type clientKey struct{}
 
+// FromContext get client from context
 func FromContext(ctx context.Context) (Client, bool) {
+	if ctx == nil {
+		return nil, false
+	}
 	c, ok := ctx.Value(clientKey{}).(Client)
 	return c, ok
 }
 
+// MustContext get client from context
+func MustContext(ctx context.Context) Client {
+	c, ok := FromContext(ctx)
+	if !ok {
+		panic("missing client")
+	}
+	return c
+}
+
+// NewContext put client in context
 func NewContext(ctx context.Context, c Client) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
 	return context.WithValue(ctx, clientKey{}, c)
 }
+
+// SetCallOption returns a function to setup a context with given value
+func SetCallOption(k, v interface{}) CallOption {
+	return func(o *CallOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}
+
+// SetOption returns a function to setup a context with given value
+func SetOption(k, v interface{}) Option {
+	return func(o *Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}

client/context_test.go

@@ -0,0 +1,62 @@
+package client
+
+import (
+	"context"
+	"testing"
+)
+
+func TestFromContext(t *testing.T) {
+	ctx := context.WithValue(context.TODO(), clientKey{}, NewClient())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("FromContext not works")
+	}
+}
+
+func TestFromNilContext(t *testing.T) {
+	// nolint: staticcheck
+	c, ok := FromContext(nil)
+	if ok || c != nil {
+		t.Fatal("FromContext not works")
+	}
+}
+
+func TestNewContext(t *testing.T) {
+	ctx := NewContext(context.TODO(), NewClient())
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}
+
+func TestNewNilContext(t *testing.T) {
+	// nolint: staticcheck
+	ctx := NewContext(nil, NewClient())
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}
+
+func TestSetCallOption(t *testing.T) {
+	type key struct{}
+	o := SetCallOption(key{}, "test")
+	opts := &CallOptions{}
+	o(opts)
+
+	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
+		t.Fatal("SetCallOption not works")
+	}
+}
+
+func TestSetOption(t *testing.T) {
+	type key struct{}
+	o := SetOption(key{}, "test")
+	opts := &Options{}
+	o(opts)
+
+	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
+		t.Fatal("SetOption not works")
+	}
+}

client/lookup.go

@@ -0,0 +1,53 @@
+package client
+
+import (
+	"context"
+	"sort"
+
+	"go.unistack.org/micro/v4/errors"
+	"go.unistack.org/micro/v4/router"
+)
+
+// LookupFunc is used to lookup routes for a service
+type LookupFunc func(context.Context, Request, CallOptions) ([]string, error)
+
+// LookupRoute for a request using the router and then choose one using the selector
+func LookupRoute(_ context.Context, req Request, opts CallOptions) ([]string, error) {
+	// check to see if an address was provided as a call option
+	if len(opts.Address) > 0 {
+		return opts.Address, nil
+	}
+
+	if opts.Router == nil {
+		return nil, router.ErrRouteNotFound
+	}
+
+	// construct the router query
+	query := []router.QueryOption{router.QueryService(req.Service())}
+
+	// if a custom network was requested, pass this to the router. By default the router will use it's
+	// own network, which is set during initialisation.
+	if len(opts.Network) > 0 {
+		query = append(query, router.QueryNetwork(opts.Network))
+	}
+
+	// lookup the routes which can be used to execute the request
+	routes, err := opts.Router.Lookup(query...)
+	if err == router.ErrRouteNotFound {
+		return nil, errors.InternalServerError("go.micro.client", "service %s: %s", req.Service(), err.Error())
+	} else if err != nil {
+		return nil, errors.InternalServerError("go.micro.client", "error getting next %s node: %s", req.Service(), err.Error())
+	}
+
+	// sort by lowest metric first
+	sort.Slice(routes, func(i, j int) bool {
+		return routes[i].Metric < routes[j].Metric
+	})
+
+	addrs := make([]string, 0, len(routes))
+	for _, route := range routes {
+		addrs = append(addrs, route.Address)
+	}
+
+	return addrs, nil
+}

client/mock/context.go

@@ -1,16 +0,0 @@
-package mock
-
-import (
-	"context"
-)
-
-type responseKey struct{}
-
-func fromContext(ctx context.Context) (map[string][]MockResponse, bool) {
-	r, ok := ctx.Value(responseKey{}).(map[string][]MockResponse)
-	return r, ok
-}
-
-func newContext(ctx context.Context, r map[string][]MockResponse) context.Context {
-	return context.WithValue(ctx, responseKey{}, r)
-}

client/mock/mock.go

@@ -1,132 +0,0 @@
-// Package mock provides a mock client for testing
-package mock
-
-import (
-	"context"
-	"fmt"
-	"reflect"
-	"sync"
-
-	"github.com/micro/go-micro/client"
-	"github.com/micro/go-micro/errors"
-)
-
-var (
-	_ client.Client = NewClient()
-)
-
-type MockResponse struct {
-	Endpoint string
-	Response interface{}
-	Error    error
-}
-
-type MockClient struct {
-	Client client.Client
-	Opts   client.Options
-
-	sync.Mutex
-	Response map[string][]MockResponse
-}
-
-func (m *MockClient) Init(opts ...client.Option) error {
-	m.Lock()
-	defer m.Unlock()
-
-	for _, opt := range opts {
-		opt(&m.Opts)
-	}
-
-	r, ok := fromContext(m.Opts.Context)
-	if !ok {
-		r = make(map[string][]MockResponse)
-	}
-	m.Response = r
-
-	return nil
-}
-
-func (m *MockClient) Options() client.Options {
-	return m.Opts
-}
-
-func (m *MockClient) NewMessage(topic string, msg interface{}, opts ...client.MessageOption) client.Message {
-	return m.Client.NewMessage(topic, msg, opts...)
-}
-
-func (m *MockClient) NewRequest(service, endpoint string, req interface{}, reqOpts ...client.RequestOption) client.Request {
-	return m.Client.NewRequest(service, endpoint, req, reqOpts...)
-}
-
-func (m *MockClient) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
-	m.Lock()
-	defer m.Unlock()
-
-	response, ok := m.Response[req.Service()]
-	if !ok {
-		return errors.NotFound("go.micro.client.mock", "service not found")
-	}
-
-	for _, r := range response {
-		if r.Endpoint != req.Endpoint() {
-			continue
-		}
-
-		if r.Error != nil {
-			return r.Error
-		}
-
-		v := reflect.ValueOf(rsp)
-
-		if t := reflect.TypeOf(rsp); t.Kind() == reflect.Ptr {
-			v = reflect.Indirect(v)
-		}
-		response := r.Response
-		if t := reflect.TypeOf(r.Response); t.Kind() == reflect.Func {
-			response = reflect.ValueOf(r.Response).Call([]reflect.Value{})[0].Interface()
-		}
-
-		v.Set(reflect.ValueOf(response))
-
-		return nil
-	}
-
-	return fmt.Errorf("rpc: can't find service %s", req.Endpoint())
-}
-
-func (m *MockClient) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {
-	m.Lock()
-	defer m.Unlock()
-
-	// TODO: mock stream
-	return nil, nil
-}
-
-func (m *MockClient) Publish(ctx context.Context, p client.Message, opts ...client.PublishOption) error {
-	return nil
-}
-
-func (m *MockClient) String() string {
-	return "mock"
-}
-
-func NewClient(opts ...client.Option) *MockClient {
-	options := client.Options{
-		Context: context.TODO(),
-	}
-
-	for _, opt := range opts {
-		opt(&options)
-	}
-
-	r, ok := fromContext(options.Context)
-	if !ok {
-		r = make(map[string][]MockResponse)
-	}
-
-	return &MockClient{
-		Client:   client.DefaultClient,
-		Opts:     options,
-		Response: r,
-	}
-}

client/mock/mock_test.go

@@ -1,38 +0,0 @@
-package mock
-
-import (
-	"context"
-	"testing"
-
-	"github.com/micro/go-micro/errors"
-)
-
-func TestClient(t *testing.T) {
-	type TestResponse struct {
-		Param string
-	}
-
-	response := []MockResponse{
-		{Endpoint: "Foo.Bar", Response: map[string]interface{}{"foo": "bar"}},
-		{Endpoint: "Foo.Struct", Response: &TestResponse{Param: "aparam"}},
-		{Endpoint: "Foo.Fail", Error: errors.InternalServerError("go.mock", "failed")},
-		{Endpoint: "Foo.Func", Response: func() string { return "string" }},
-		{Endpoint: "Foo.FuncStruct", Response: func() *TestResponse { return &TestResponse{Param: "aparam"} }},
-	}
-
-	c := NewClient(Response("go.mock", response))
-
-	for _, r := range response {
-		req := c.NewRequest("go.mock", r.Endpoint, map[string]interface{}{"foo": "bar"})
-		var rsp interface{}
-
-		err := c.Call(context.TODO(), req, &rsp)
-
-		if err != r.Error {
-			t.Fatalf("Expecter error %v got %v", r.Error, err)
-		}
-
-		t.Log(rsp)
-	}
-
-}

client/mock/options.go

@@ -1,17 +0,0 @@
-package mock
-
-import (
-	"github.com/micro/go-micro/client"
-)
-
-// Response sets the response methods for a service
-func Response(service string, response []MockResponse) client.Option {
-	return func(o *client.Options) {
-		r, ok := fromContext(o.Context)
-		if !ok {
-			r = make(map[string][]MockResponse)
-		}
-		r[service] = response
-		o.Context = newContext(o.Context, r)
-	}
-}

client/noop.go

@@ -0,0 +1,502 @@
+package client
+
+import (
+	"context"
+	"fmt"
+	"strconv"
+	"time"
+
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/errors"
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/options"
+	"go.unistack.org/micro/v4/selector"
+	"go.unistack.org/micro/v4/semconv"
+	"go.unistack.org/micro/v4/tracer"
+)
+
+// DefaultCodecs will be used to encode/decode data
+var DefaultCodecs = map[string]codec.Codec{
+	"application/octet-stream": codec.NewCodec(),
+}
+
+type noopClient struct {
+	funcCall   FuncCall
+	funcStream FuncStream
+	opts       Options
+}
+
+type noopRequest struct {
+	body        interface{}
+	codec       codec.Codec
+	service     string
+	method      string
+	endpoint    string
+	contentType string
+	stream      bool
+}
+
+// NewClient returns new noop client
+func NewClient(opts ...Option) Client {
+	n := &noopClient{opts: NewOptions(opts...)}
+
+	n.funcCall = n.fnCall
+	n.funcStream = n.fnStream
+
+	return n
+}
+
+func (n *noopClient) Name() string {
+	return n.opts.Name
+}
+
+func (n *noopRequest) Service() string {
+	return n.service
+}
+
+func (n *noopRequest) Method() string {
+	return n.method
+}
+
+func (n *noopRequest) Endpoint() string {
+	return n.endpoint
+}
+
+func (n *noopRequest) ContentType() string {
+	return n.contentType
+}
+
+func (n *noopRequest) Body() interface{} {
+	return n.body
+}
+
+func (n *noopRequest) Codec() codec.Codec {
+	return n.codec
+}
+
+func (n *noopRequest) Stream() bool {
+	return n.stream
+}
+
+type noopResponse struct {
+	codec  codec.Codec
+	header metadata.Metadata
+}
+
+func (n *noopResponse) Codec() codec.Codec {
+	return n.codec
+}
+
+func (n *noopResponse) Header() metadata.Metadata {
+	return n.header
+}
+
+func (n *noopResponse) Read() ([]byte, error) {
+	return nil, nil
+}
+
+type noopStream struct {
+	err error
+	ctx context.Context
+}
+
+func (n *noopStream) Context() context.Context {
+	return n.ctx
+}
+
+func (n *noopStream) Request() Request {
+	return &noopRequest{}
+}
+
+func (n *noopStream) Response() Response {
+	return &noopResponse{}
+}
+
+func (n *noopStream) Send(interface{}) error {
+	return nil
+}
+
+func (n *noopStream) Recv(interface{}) error {
+	return nil
+}
+
+func (n *noopStream) SendMsg(interface{}) error {
+	return nil
+}
+
+func (n *noopStream) RecvMsg(interface{}) error {
+	return nil
+}
+
+func (n *noopStream) Error() error {
+	return n.err
+}
+
+func (n *noopStream) Close() error {
+	if sp, ok := tracer.SpanFromContext(n.ctx); ok && sp != nil {
+		if n.err != nil {
+			sp.SetStatus(tracer.SpanStatusError, n.err.Error())
+		}
+		sp.Finish()
+	}
+	return n.err
+}
+
+func (n *noopStream) CloseSend() error {
+	return n.err
+}
+
+func (n *noopClient) Init(opts ...Option) error {
+	for _, o := range opts {
+		o(&n.opts)
+	}
+
+	n.funcCall = n.fnCall
+	n.funcStream = n.fnStream
+
+	n.opts.Hooks.EachPrev(func(hook options.Hook) {
+		switch h := hook.(type) {
+		case HookCall:
+			n.funcCall = h(n.funcCall)
+		case HookStream:
+			n.funcStream = h(n.funcStream)
+		}
+	})
+
+	return nil
+}
+
+func (n *noopClient) Options() Options {
+	return n.opts
+}
+
+func (n *noopClient) String() string {
+	return "noop"
+}
+
+func (n *noopClient) Call(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error {
+	ts := time.Now()
+	n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Inc()
+	var sp tracer.Span
+	ctx, sp = n.opts.Tracer.Start(ctx, "rpc-client",
+		tracer.WithSpanKind(tracer.SpanKindClient),
+		tracer.WithSpanLabels("endpoint", req.Endpoint()),
+	)
+	err := n.funcCall(ctx, req, rsp, opts...)
+	n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Dec()
+	te := time.Since(ts)
+	n.opts.Meter.Summary(semconv.ClientRequestLatencyMicroseconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+	n.opts.Meter.Histogram(semconv.ClientRequestDurationSeconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+
+	if me := errors.FromError(err); me == nil {
+		sp.Finish()
+		n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "success", "code", strconv.Itoa(int(200))).Inc()
+	} else {
+		sp.SetStatus(tracer.SpanStatusError, err.Error())
+		n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "failure", "code", strconv.Itoa(int(me.Code))).Inc()
+	}
+
+	return err
+}
+
+func (n *noopClient) fnCall(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error {
+	// make a copy of call opts
+	callOpts := n.opts.CallOptions
+	for _, opt := range opts {
+		opt(&callOpts)
+	}
+
+	// check if we already have a deadline
+	d, ok := ctx.Deadline()
+	if !ok {
+		var cancel context.CancelFunc
+		// no deadline so we create a new one
+		ctx, cancel = context.WithTimeout(ctx, callOpts.RequestTimeout)
+		defer cancel()
+	} else {
+		// got a deadline so no need to setup context
+		// but we need to set the timeout we pass along
+		opt := WithRequestTimeout(time.Until(d))
+		opt(&callOpts)
+	}
+
+	// should we noop right here?
+	select {
+	case <-ctx.Done():
+		return errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
+	default:
+	}
+
+	// make copy of call method
+	hcall := func(ctx context.Context, addr string, req Request, rsp interface{}, opts CallOptions) error {
+		return nil
+	}
+
+	// use the router passed as a call option, or fallback to the rpc clients router
+	if callOpts.Router == nil {
+		callOpts.Router = n.opts.Router
+	}
+
+	if callOpts.Selector == nil {
+		callOpts.Selector = n.opts.Selector
+	}
+
+	// inject proxy address
+	// TODO: don't even bother using Lookup/Select in this case
+	if len(n.opts.Proxy) > 0 {
+		callOpts.Address = []string{n.opts.Proxy}
+	}
+
+	var next selector.Next
+
+	// return errors.New("go.micro.client", "request timeout", 408)
+	call := func(i int) error {
+		// call backoff first. Someone may want an initial start delay
+		t, err := callOpts.Backoff(ctx, req, i)
+		if err != nil {
+			return errors.InternalServerError("go.micro.client", "%s", err)
+		}
+
+		// only sleep if greater than 0
+		if t.Seconds() > 0 {
+			time.Sleep(t)
+		}
+
+		if next == nil {
+			var routes []string
+			// lookup the route to send the reques to
+			// TODO apply any filtering here
+			routes, err = n.opts.Lookup(ctx, req, callOpts)
+			if err != nil {
+				return errors.InternalServerError("go.micro.client", "%s", err)
+			}
+
+			// balance the list of nodes
+			next, err = callOpts.Selector.Select(routes)
+			if err != nil {
+				return err
+			}
+		}
+
+		node := next()
+
+		// make the call
+		err = hcall(ctx, node, req, rsp, callOpts)
+		// record the result of the call to inform future routing decisions
+		if verr := n.opts.Selector.Record(node, err); verr != nil {
+			return verr
+		}
+
+		// try and transform the error to a go-micro error
+		if verr, ok := err.(*errors.Error); ok {
+			return verr
+		}
+
+		return err
+	}
+
+	ch := make(chan error, callOpts.Retries)
+	var gerr error
+
+	for i := 0; i <= callOpts.Retries; i++ {
+		go func() {
+			ch <- call(i)
+		}()
+
+		select {
+		case <-ctx.Done():
+			return errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
+		case err := <-ch:
+			// if the call succeeded lets bail early
+			if err == nil {
+				return nil
+			}
+
+			retry, rerr := callOpts.Retry(ctx, req, i, err)
+			if rerr != nil {
+				return rerr
+			}
+
+			if !retry {
+				return err
+			}
+
+			gerr = err
+		}
+	}
+
+	return gerr
+}
+
+func (n *noopClient) NewRequest(service, endpoint string, _ interface{}, _ ...RequestOption) Request {
+	return &noopRequest{service: service, endpoint: endpoint}
+}
+
+func (n *noopClient) Stream(ctx context.Context, req Request, opts ...CallOption) (Stream, error) {
+	ts := time.Now()
+	n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Inc()
+	var sp tracer.Span
+	ctx, sp = n.opts.Tracer.Start(ctx, "rpc-client",
+		tracer.WithSpanKind(tracer.SpanKindClient),
+		tracer.WithSpanLabels("endpoint", req.Endpoint()),
+	)
+	stream, err := n.funcStream(ctx, req, opts...)
+	n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Dec()
+	te := time.Since(ts)
+	n.opts.Meter.Summary(semconv.ClientRequestLatencyMicroseconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+	n.opts.Meter.Histogram(semconv.ClientRequestDurationSeconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+
+	if me := errors.FromError(err); me == nil {
+		sp.Finish()
+		n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "success", "code", strconv.Itoa(int(200))).Inc()
+	} else {
+		sp.SetStatus(tracer.SpanStatusError, err.Error())
+		n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "failure", "code", strconv.Itoa(int(me.Code))).Inc()
+	}
+
+	return stream, err
+}
+
+func (n *noopClient) fnStream(ctx context.Context, req Request, opts ...CallOption) (Stream, error) {
+	var err error
+
+	// make a copy of call opts
+	callOpts := n.opts.CallOptions
+	for _, o := range opts {
+		o(&callOpts)
+	}
+
+	// check if we already have a deadline
+	d, ok := ctx.Deadline()
+	if !ok && callOpts.StreamTimeout > time.Duration(0) {
+		var cancel context.CancelFunc
+		// no deadline so we create a new one
+		ctx, cancel = context.WithTimeout(ctx, callOpts.StreamTimeout)
+		defer cancel()
+	} else {
+		// got a deadline so no need to setup context
+		// but we need to set the timeout we pass along
+		o := WithStreamTimeout(time.Until(d))
+		o(&callOpts)
+	}
+
+	// should we noop right here?
+	select {
+	case <-ctx.Done():
+		return nil, errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
+	default:
+	}
+
+	/*
+		// make copy of call method
+		hstream := h.stream
+		// wrap the call in reverse
+		for i := len(callOpts.CallWrappers); i > 0; i-- {
+			hstream = callOpts.CallWrappers[i-1](hstream)
+		}
+	*/
+
+	// use the router passed as a call option, or fallback to the rpc clients router
+	if callOpts.Router == nil {
+		callOpts.Router = n.opts.Router
+	}
+
+	if callOpts.Selector == nil {
+		callOpts.Selector = n.opts.Selector
+	}
+
+	// inject proxy address
+	// TODO: don't even bother using Lookup/Select in this case
+	if len(n.opts.Proxy) > 0 {
+		callOpts.Address = []string{n.opts.Proxy}
+	}
+
+	var next selector.Next
+
+	call := func(i int) (Stream, error) {
+		// call backoff first. Someone may want an initial start delay
+		t, cerr := callOpts.Backoff(ctx, req, i)
+		if cerr != nil {
+			return nil, errors.InternalServerError("go.micro.client", "%s", cerr)
+		}
+
+		// only sleep if greater than 0
+		if t.Seconds() > 0 {
+			time.Sleep(t)
+		}
+
+		if next == nil {
+			var routes []string
+			// lookup the route to send the reques to
+			// TODO apply any filtering here
+			routes, err = n.opts.Lookup(ctx, req, callOpts)
+			if err != nil {
+				return nil, errors.InternalServerError("go.micro.client", "%s", err)
+			}
+
+			// balance the list of nodes
+			next, err = callOpts.Selector.Select(routes)
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		node := next()
+
+		stream, cerr := n.stream(ctx, node, req, callOpts)
+
+		// record the result of the call to inform future routing decisions
+		if verr := n.opts.Selector.Record(node, cerr); verr != nil {
+			return nil, verr
+		}
+
+		// try and transform the error to a go-micro error
+		if verr, ok := cerr.(*errors.Error); ok {
+			return nil, verr
+		}
+
+		return stream, cerr
+	}
+
+	type response struct {
+		stream Stream
+		err    error
+	}
+
+	ch := make(chan response, callOpts.Retries)
+	var grr error
+
+	for i := 0; i <= callOpts.Retries; i++ {
+		go func() {
+			s, cerr := call(i)
+			ch <- response{s, cerr}
+		}()
+
+		select {
+		case <-ctx.Done():
+			return nil, errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
+		case rsp := <-ch:
+			// if the call succeeded lets bail early
+			if rsp.err == nil {
+				return rsp.stream, nil
+			}
+
+			retry, rerr := callOpts.Retry(ctx, req, i, err)
+			if rerr != nil {
+				return nil, rerr
+			}
+
+			if !retry {
+				return nil, rsp.err
+			}
+
+			grr = rsp.err
+		}
+	}
+
+	return nil, grr
+}
+
+func (n *noopClient) stream(ctx context.Context, _ string, _ Request, _ CallOptions) (Stream, error) {
+	return &noopStream{ctx: ctx}, nil
+}

client/options.go

@@ -2,128 +2,189 @@ package client
 
 import (
 	"context"
+	"crypto/tls"
+	"net"
 	"time"
 
-	"github.com/micro/go-micro/broker"
-	"github.com/micro/go-micro/codec"
-	"github.com/micro/go-micro/registry"
-	"github.com/micro/go-micro/selector"
-	"github.com/micro/go-micro/transport"
+	"go.unistack.org/micro/v4/broker"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/meter"
+	"go.unistack.org/micro/v4/options"
+	"go.unistack.org/micro/v4/register"
+	"go.unistack.org/micro/v4/router"
+	"go.unistack.org/micro/v4/selector"
+	"go.unistack.org/micro/v4/selector/random"
+	"go.unistack.org/micro/v4/tracer"
 )
 
+// Options holds client options
 type Options struct {
-	// Used to select codec
+	// Codecs map
+	Codecs map[string]codec.Codec
+
+	// Proxy is used for proxy requests
+	Proxy string
+	// ContentType is used to select codec
 	ContentType string
+	// Name is the client name
+	Name string
 
-	// Plugged interfaces
-	Broker    broker.Broker
-	Codecs    map[string]codec.NewCodec
-	Registry  registry.Registry
-	Selector  selector.Selector
-	Transport transport.Transport
+	// Selector used to select needed address
+	Selector selector.Selector
+	// Logger used to log messages
+	Logger logger.Logger
+	// Tracer used for tracing
+	Tracer tracer.Tracer
+	// Broker used to publish messages
+	Broker broker.Broker
+	// Meter used for metrics
+	Meter meter.Meter
+	// Context is used for external options
+	Context context.Context
+	// Router used to get route
+	Router router.Router
 
-	// Router sets the router
-	Router Router
+	// TLSConfig specifies tls.Config for secure connection
+	TLSConfig *tls.Config
 
-	// Connection Pool
-	PoolSize int
-	PoolTTL  time.Duration
+	// Lookup func used to get destination addr
+	Lookup LookupFunc
+	// ContextDialer used to connect
+	ContextDialer func(context.Context, string) (net.Conn, error)
 
-	// Middleware for client
+	// Wrappers contains wrappers
 	Wrappers []Wrapper
+	// Hooks can be run before broker Publish/BatchPublish and
+	// Subscribe/BatchSubscribe methods
+	Hooks options.Hooks
 
-	// Default Call Options
+	// CallOptions contains default CallOptions
 	CallOptions CallOptions
 
-	// Other options for implementations of the interface
-	// can be stored in a context
-	Context context.Context
+	// PoolSize connection pool size
+	PoolSize int
+	// PoolTTL connection pool ttl
+	PoolTTL time.Duration
 }
 
+// NewCallOptions creates new call options struct
+func NewCallOptions(opts ...CallOption) CallOptions {
+	options := CallOptions{}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}
+
+// CallOptions holds client call options
 type CallOptions struct {
+	// RequestMetadata holds additional metadata for call
+	RequestMetadata metadata.Metadata
+
+	// Network name
+	Network string
+	// Content-Type
+	ContentType string
+	// AuthToken string
+	AuthToken string
+
+	// Selector selects addr
+	Selector selector.Selector
+	// Context used for deadline
+	Context context.Context
+	// Router used for route
+	Router router.Router
+	// Retry func used for retries
+
+	// ResponseMetadata holds additional metadata from call
+	ResponseMetadata *metadata.Metadata
+
+	Retry RetryFunc
+	// Backoff func used for backoff when retry
+	Backoff BackoffFunc
+	// ContextDialer used to connect
+	ContextDialer func(context.Context, string) (net.Conn, error)
+
+	// Address specifies static addr list
+	Address []string
+	// SelectOptions selector options
 	SelectOptions []selector.SelectOption
 
-	// Address of remote host
-	Address string
-	// Backoff func
-	Backoff BackoffFunc
-	// Check if retriable func
-	Retry RetryFunc
-	// Transport Dial Timeout
-	DialTimeout time.Duration
-	// Number of Call attempts
-	Retries int
-	// Request/Response timeout
+	// StreamTimeout stream timeout
+	StreamTimeout time.Duration
+	// RequestTimeout request timeout
 	RequestTimeout time.Duration
 
-	// Middleware for low level call func
-	CallWrappers []CallWrapper
-
-	// Other options for implementations of the interface
-	// can be stored in a context
-	Context context.Context
+	// DialTimeout dial timeout
+	DialTimeout time.Duration
+	// Retries specifies retries num
+	Retries int
 }
 
-type PublishOptions struct {
-	// Other options for implementations of the interface
-	// can be stored in a context
-	Context context.Context
+// ContextDialer pass ContextDialer to client
+func ContextDialer(fn func(context.Context, string) (net.Conn, error)) Option {
+	return func(o *Options) {
+		o.ContextDialer = fn
+	}
 }
 
-type MessageOptions struct {
-	ContentType string
+// Context pass context to client
+func Context(ctx context.Context) Option {
+	return func(o *Options) {
+		o.Context = ctx
+	}
 }
 
+// NewRequestOptions creates new RequestOptions struct
+func NewRequestOptions(opts ...RequestOption) RequestOptions {
+	options := RequestOptions{}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}
+
+// RequestOptions holds client request options
 type RequestOptions struct {
-	ContentType string
-	Stream      bool
-
-	// Other options for implementations of the interface
-	// can be stored in a context
+	// Context used for external options
 	Context context.Context
+	// ContentType specify content-type of message
+	ContentType string
+	// Stream flag
+	Stream bool
 }
 
-func newOptions(options ...Option) Options {
-	opts := Options{
-		Codecs: make(map[string]codec.NewCodec),
+// NewOptions creates new options struct
+func NewOptions(opts ...Option) Options {
+	options := Options{
+		Context:     context.Background(),
+		ContentType: DefaultContentType,
+		Codecs:      DefaultCodecs,
 		CallOptions: CallOptions{
+			Context:        context.Background(),
 			Backoff:        DefaultBackoff,
 			Retry:          DefaultRetry,
 			Retries:        DefaultRetries,
 			RequestTimeout: DefaultRequestTimeout,
-			DialTimeout:    transport.DefaultDialTimeout,
 		},
+		Lookup:   LookupRoute,
 		PoolSize: DefaultPoolSize,
 		PoolTTL:  DefaultPoolTTL,
+		Selector: random.NewSelector(),
+		Logger:   logger.DefaultLogger,
+		Broker:   broker.DefaultBroker,
+		Meter:    meter.DefaultMeter,
+		Tracer:   tracer.DefaultTracer,
+		Router:   router.DefaultRouter,
 	}
 
-	for _, o := range options {
-		o(&opts)
+	for _, o := range opts {
+		o(&options)
 	}
 
-	if len(opts.ContentType) == 0 {
-		opts.ContentType = DefaultContentType
-	}
-
-	if opts.Broker == nil {
-		opts.Broker = broker.DefaultBroker
-	}
-
-	if opts.Registry == nil {
-		opts.Registry = registry.DefaultRegistry
-	}
-
-	if opts.Selector == nil {
-		opts.Selector = selector.NewSelector(
-			selector.Registry(opts.Registry),
-		)
-	}
-
-	if opts.Transport == nil {
-		opts.Transport = transport.DefaultTransport
-	}
-
-	return opts
+	return options
 }
 
 // Broker to be used for pub/sub
@@ -133,20 +194,48 @@ func Broker(b broker.Broker) Option {
 	}
 }
 
+// Tracer to be used for tracing
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}
+
+// Logger to be used for log mesages
+func Logger(l logger.Logger) Option {
+	return func(o *Options) {
+		o.Logger = l
+	}
+}
+
+// Meter to be used for metrics
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
 // Codec to be used to encode/decode requests for a given content type
-func Codec(contentType string, c codec.NewCodec) Option {
+func Codec(contentType string, c codec.Codec) Option {
 	return func(o *Options) {
 		o.Codecs[contentType] = c
 	}
 }
 
-// Default content type of the client
+// ContentType used by default if not specified
 func ContentType(ct string) Option {
 	return func(o *Options) {
 		o.ContentType = ct
 	}
 }
 
+// Proxy sets the proxy address
+func Proxy(addr string) Option {
+	return func(o *Options) {
+		o.Proxy = addr
+	}
+}
+
 // PoolSize sets the connection pool size
 func PoolSize(d int) Option {
 	return func(o *Options) {
@@ -154,58 +243,66 @@ func PoolSize(d int) Option {
 	}
 }
 
-// PoolSize sets the connection pool size
+// PoolTTL sets the connection pool ttl
 func PoolTTL(d time.Duration) Option {
 	return func(o *Options) {
 		o.PoolTTL = d
 	}
 }
 
-// Registry to find nodes for a given service
-func Registry(r registry.Registry) Option {
+// Register sets the routers register
+func Register(r register.Register) Option {
 	return func(o *Options) {
-		o.Registry = r
+		if o.Router != nil {
+			_ = o.Router.Init(router.Register(r))
+		}
 	}
 }
 
-// Transport to use for communication e.g http, rabbitmq, etc
-func Transport(t transport.Transport) Option {
+// Router is used to lookup routes for a service
+func Router(r router.Router) Option {
 	return func(o *Options) {
-		o.Transport = t
+		o.Router = r
 	}
 }
 
-// Select is used to select a node to route a request to
+// Selector is used to select a route
 func Selector(s selector.Selector) Option {
 	return func(o *Options) {
 		o.Selector = s
 	}
 }
 
-// Adds a Wrapper to a list of options passed into the client
-func Wrap(w Wrapper) Option {
-	return func(o *Options) {
-		o.Wrappers = append(o.Wrappers, w)
-	}
-}
-
-// Adds a Wrapper to the list of CallFunc wrappers
-func WrapCall(cw ...CallWrapper) Option {
-	return func(o *Options) {
-		o.CallOptions.CallWrappers = append(o.CallOptions.CallWrappers, cw...)
-	}
-}
-
-// Backoff is used to set the backoff function used
-// when retrying Calls
+// Backoff is used to set the backoff function used when retrying Calls
 func Backoff(fn BackoffFunc) Option {
 	return func(o *Options) {
 		o.CallOptions.Backoff = fn
 	}
 }
 
-// Number of retries when making the request.
-// Should this be a Call Option?
+// Name sets the client name
+func Name(n string) Option {
+	return func(o *Options) {
+		o.Name = n
+	}
+}
+
+// Lookup sets the lookup function to use for resolving service names
+func Lookup(l LookupFunc) Option {
+	return func(o *Options) {
+		o.Lookup = l
+	}
+}
+
+// TLSConfig specifies a *tls.Config
+func TLSConfig(t *tls.Config) Option {
+	return func(o *Options) {
+		// set the internal tls
+		o.TLSConfig = t
+	}
+}
+
+// Retries sets the retry count when making the request.
 func Retries(i int) Option {
 	return func(o *Options) {
 		o.CallOptions.Retries = i
@@ -219,43 +316,48 @@ func Retry(fn RetryFunc) Option {
 	}
 }
 
-// The request timeout.
-// Should this be a Call Option?
+// RequestTimeout is the request timeout.
 func RequestTimeout(d time.Duration) Option {
 	return func(o *Options) {
 		o.CallOptions.RequestTimeout = d
 	}
 }
 
-// Transport dial timeout
+// StreamTimeout sets the stream timeout
+func StreamTimeout(d time.Duration) Option {
+	return func(o *Options) {
+		o.CallOptions.StreamTimeout = d
+	}
+}
+
+// DialTimeout sets the dial timeout
 func DialTimeout(d time.Duration) Option {
 	return func(o *Options) {
 		o.CallOptions.DialTimeout = d
 	}
 }
 
-// Call Options
+// WithContextDialer pass ContextDialer to client call
+func WithContextDialer(fn func(context.Context, string) (net.Conn, error)) CallOption {
+	return func(o *CallOptions) {
+		o.ContextDialer = fn
+	}
+}
 
-// WithAddress sets the remote address to use rather than using service discovery
-func WithAddress(a string) CallOption {
+// WithContentType specifies call content type
+func WithContentType(ct string) CallOption {
+	return func(o *CallOptions) {
+		o.ContentType = ct
+	}
+}
+
+// WithAddress sets the remote addresses to use rather than using service discovery
+func WithAddress(a ...string) CallOption {
 	return func(o *CallOptions) {
 		o.Address = a
 	}
 }
 
-func WithSelectOption(so ...selector.SelectOption) CallOption {
-	return func(o *CallOptions) {
-		o.SelectOptions = append(o.SelectOptions, so...)
-	}
-}
-
-// WithCallWrapper is a CallOption which adds to the existing CallFunc wrappers
-func WithCallWrapper(cw ...CallWrapper) CallOption {
-	return func(o *CallOptions) {
-		o.CallWrappers = append(o.CallWrappers, cw...)
-	}
-}
-
 // WithBackoff is a CallOption which overrides that which
 // set in Options.CallOptions
 func WithBackoff(fn BackoffFunc) CallOption {
@@ -280,6 +382,20 @@ func WithRetries(i int) CallOption {
 	}
 }
 
+// WithResponseMetadata is a CallOption which adds metadata.Metadata to Options.CallOptions
+func WithResponseMetadata(md *metadata.Metadata) CallOption {
+	return func(o *CallOptions) {
+		o.ResponseMetadata = md
+	}
+}
+
+// WithRequestMetadata is a CallOption which adds metadata.Metadata to Options.CallOptions
+func WithRequestMetadata(md metadata.Metadata) CallOption {
+	return func(o *CallOptions) {
+		o.RequestMetadata = md
+	}
+}
+
 // WithRequestTimeout is a CallOption which overrides that which
 // set in Options.CallOptions
 func WithRequestTimeout(d time.Duration) CallOption {
@@ -288,6 +404,13 @@ func WithRequestTimeout(d time.Duration) CallOption {
 	}
 }
 
+// WithStreamTimeout sets the stream timeout
+func WithStreamTimeout(d time.Duration) CallOption {
+	return func(o *CallOptions) {
+		o.StreamTimeout = d
+	}
+}
+
 // WithDialTimeout is a CallOption which overrides that which
 // set in Options.CallOptions
 func WithDialTimeout(d time.Duration) CallOption {
@@ -296,23 +419,52 @@ func WithDialTimeout(d time.Duration) CallOption {
 	}
 }
 
-// Request Options
+// WithAuthToken is a CallOption which overrides the
+// authorization header with the services own auth token
+func WithAuthToken(t string) CallOption {
+	return func(o *CallOptions) {
+		o.AuthToken = t
+	}
+}
 
-func WithContentType(ct string) RequestOption {
+// WithRouter sets the router to use for this call
+func WithRouter(r router.Router) CallOption {
+	return func(o *CallOptions) {
+		o.Router = r
+	}
+}
+
+// WithSelector sets the selector to use for this call
+func WithSelector(s selector.Selector) CallOption {
+	return func(o *CallOptions) {
+		o.Selector = s
+	}
+}
+
+// WithSelectOptions sets the options to pass to the selector for this call
+func WithSelectOptions(sops ...selector.SelectOption) CallOption {
+	return func(o *CallOptions) {
+		o.SelectOptions = sops
+	}
+}
+
+// StreamingRequest specifies that request is streaming
+func StreamingRequest(b bool) RequestOption {
+	return func(o *RequestOptions) {
+		o.Stream = b
+	}
+}
+
+// RequestContentType specifies request content type
+func RequestContentType(ct string) RequestOption {
 	return func(o *RequestOptions) {
 		o.ContentType = ct
 	}
 }
 
-func StreamingRequest() RequestOption {
-	return func(o *RequestOptions) {
-		o.Stream = true
-	}
-}
-
-// WithRouter sets the client router
-func WithRouter(r Router) Option {
+// Hooks sets hook runs before action
+func Hooks(h ...options.Hook) Option {
 	return func(o *Options) {
-		o.Router = r
+		o.Hooks = append(o.Hooks, h...)
 	}
 }

client/options_test.go

@@ -1,85 +0,0 @@
-package client
-
-import (
-	"testing"
-	"time"
-
-	"github.com/micro/go-micro/transport"
-)
-
-func TestCallOptions(t *testing.T) {
-	testData := []struct {
-		set      bool
-		retries  int
-		rtimeout time.Duration
-		dtimeout time.Duration
-	}{
-		{false, DefaultRetries, DefaultRequestTimeout, transport.DefaultDialTimeout},
-		{true, 10, time.Second, time.Second * 2},
-	}
-
-	for _, d := range testData {
-		var opts Options
-		var cl Client
-
-		if d.set {
-			opts = newOptions(
-				Retries(d.retries),
-				RequestTimeout(d.rtimeout),
-				DialTimeout(d.dtimeout),
-			)
-
-			cl = NewClient(
-				Retries(d.retries),
-				RequestTimeout(d.rtimeout),
-				DialTimeout(d.dtimeout),
-			)
-		} else {
-			opts = newOptions()
-			cl = NewClient()
-		}
-
-		// test options and those set in client
-		for _, o := range []Options{opts, cl.Options()} {
-			if o.CallOptions.Retries != d.retries {
-				t.Fatalf("Expected retries %v got %v", d.retries, o.CallOptions.Retries)
-			}
-
-			if o.CallOptions.RequestTimeout != d.rtimeout {
-				t.Fatalf("Expected request timeout %v got %v", d.rtimeout, o.CallOptions.RequestTimeout)
-			}
-
-			if o.CallOptions.DialTimeout != d.dtimeout {
-				t.Fatalf("Expected %v got %v", d.dtimeout, o.CallOptions.DialTimeout)
-			}
-
-			// copy CallOptions
-			callOpts := o.CallOptions
-
-			// create new opts
-			cretries := WithRetries(o.CallOptions.Retries * 10)
-			crtimeout := WithRequestTimeout(o.CallOptions.RequestTimeout * (time.Second * 10))
-			cdtimeout := WithDialTimeout(o.CallOptions.DialTimeout * (time.Second * 10))
-
-			// set call options
-			for _, opt := range []CallOption{cretries, crtimeout, cdtimeout} {
-				opt(&callOpts)
-			}
-
-			// check call options
-			if e := o.CallOptions.Retries * 10; callOpts.Retries != e {
-				t.Fatalf("Expected retries %v got %v", e, callOpts.Retries)
-			}
-
-			if e := o.CallOptions.RequestTimeout * (time.Second * 10); callOpts.RequestTimeout != e {
-				t.Fatalf("Expected request timeout %v got %v", e, callOpts.RequestTimeout)
-			}
-
-			if e := o.CallOptions.DialTimeout * (time.Second * 10); callOpts.DialTimeout != e {
-				t.Fatalf("Expected %v got %v", e, callOpts.DialTimeout)
-			}
-
-		}
-
-	}
-}

client/retry.go

@@ -3,10 +3,10 @@ package client
 import (
 	"context"
 
-	"github.com/micro/go-micro/errors"
+	"go.unistack.org/micro/v4/errors"
 )
 
-// note that returning either false or a non-nil error will result in the call not being retried
+// RetryFunc that returning either false or a non-nil error will result in the call not being retried
 type RetryFunc func(ctx context.Context, req Request, retryCount int, err error) (bool, error)
 
 // RetryAlways always retry on error
@@ -14,22 +14,37 @@ func RetryAlways(ctx context.Context, req Request, retryCount int, err error) (b
 	return true, nil
 }
 
-// RetryOnError retries a request on a 500 or timeout error
-func RetryOnError(ctx context.Context, req Request, retryCount int, err error) (bool, error) {
+// RetryNever never retry on error
+func RetryNever(ctx context.Context, req Request, retryCount int, err error) (bool, error) {
+	return false, nil
+}
+
+// RetryOnError retries a request on a 500 or 408 (timeout) error
+func RetryOnError(_ context.Context, _ Request, _ int, err error) (bool, error) {
 	if err == nil {
 		return false, nil
 	}
-
-	e := errors.Parse(err.Error())
-	if e == nil {
-		return false, nil
-	}
-
-	switch e.Code {
+	me := errors.FromError(err)
+	switch me.Code {
 	// retry on timeout or internal server error
 	case 408, 500:
 		return true, nil
-	default:
+	}
+	return false, nil
+}
+
+// RetryOnErrors retries a request on specified error codes
+func RetryOnErrors(codes ...int32) RetryFunc {
+	return func(_ context.Context, _ Request, _ int, err error) (bool, error) {
+		if err == nil {
+			return false, nil
+		}
+		me := errors.FromError(err)
+		for _, code := range codes {
+			if me.Code == code {
+				return true, nil
+			}
+		}
 		return false, nil
 	}
 }

client/retry_test.go

@@ -0,0 +1,70 @@
+package client
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	"go.unistack.org/micro/v4/errors"
+)
+
+func TestRetryAlways(t *testing.T) {
+	tests := []error{
+		nil,
+		errors.InternalServerError("test", "%s", "test"),
+		fmt.Errorf("test"),
+	}
+
+	for _, e := range tests {
+		ok, er := RetryAlways(context.TODO(), nil, 1, e)
+		if !ok || er != nil {
+			t.Fatal("RetryAlways not works properly")
+		}
+	}
+}
+
+func TestRetryNever(t *testing.T) {
+	tests := []error{
+		nil,
+		errors.InternalServerError("test", "%s", "test"),
+		fmt.Errorf("test"),
+	}
+
+	for _, e := range tests {
+		ok, er := RetryNever(context.TODO(), nil, 1, e)
+		if ok || er != nil {
+			t.Fatal("RetryNever not works properly")
+		}
+	}
+}
+
+func TestRetryOnError(t *testing.T) {
+	tests := []error{
+		fmt.Errorf("test"),
+		errors.NotFound("test", "%s", "test"),
+		errors.Timeout("test", "%s", "test"),
+	}
+
+	for i, e := range tests {
+		ok, er := RetryOnError(context.TODO(), nil, 1, e)
+		if i == 2 && (!ok || er != nil) {
+			t.Fatal("RetryOnError not works properly")
+		}
+	}
+}
+
+func TestRetryOnErrors(t *testing.T) {
+	tests := []error{
+		fmt.Errorf("test"),
+		errors.NotFound("test", "%s", "test"),
+		errors.Timeout("test", "%s", "test"),
+	}
+
+	fn := RetryOnErrors(404)
+	for i, e := range tests {
+		ok, er := fn(context.TODO(), nil, 1, e)
+		if i == 1 && (!ok || er != nil) {
+			t.Fatal("RetryOnErrors not works properly")
+		}
+	}
+}

client/rpc/rpc.go

@@ -1,11 +0,0 @@
-// Package rpc provides an rpc client
-package rpc
-
-import (
-	"github.com/micro/go-micro/client"
-)
-
-// NewClient returns a new micro client interface
-func NewClient(opts ...client.Option) client.Client {
-	return client.NewClient(opts...)
-}

client/rpc_client.go

@@ -1,529 +0,0 @@
-package client
-
-import (
-	"bytes"
-	"context"
-	"fmt"
-	"net"
-	"strconv"
-	"sync"
-	"sync/atomic"
-	"time"
-
-	"github.com/google/uuid"
-	"github.com/micro/go-micro/broker"
-	"github.com/micro/go-micro/codec"
-	"github.com/micro/go-micro/errors"
-	"github.com/micro/go-micro/metadata"
-	"github.com/micro/go-micro/registry"
-	"github.com/micro/go-micro/selector"
-	"github.com/micro/go-micro/transport"
-)
-
-type rpcClient struct {
-	once sync.Once
-	opts Options
-	pool *pool
-	seq  uint64
-}
-
-func newRpcClient(opt ...Option) Client {
-	opts := newOptions(opt...)
-
-	rc := &rpcClient{
-		once: sync.Once{},
-		opts: opts,
-		pool: newPool(opts.PoolSize, opts.PoolTTL),
-		seq:  0,
-	}
-
-	c := Client(rc)
-
-	// wrap in reverse
-	for i := len(opts.Wrappers); i > 0; i-- {
-		c = opts.Wrappers[i-1](c)
-	}
-
-	return c
-}
-
-func (r *rpcClient) newCodec(contentType string) (codec.NewCodec, error) {
-	if c, ok := r.opts.Codecs[contentType]; ok {
-		return c, nil
-	}
-	if cf, ok := DefaultCodecs[contentType]; ok {
-		return cf, nil
-	}
-	return nil, fmt.Errorf("Unsupported Content-Type: %s", contentType)
-}
-
-func (r *rpcClient) call(ctx context.Context, node *registry.Node, req Request, resp interface{}, opts CallOptions) error {
-	address := node.Address
-	if node.Port > 0 {
-		address = fmt.Sprintf("%s:%d", address, node.Port)
-	}
-
-	msg := &transport.Message{
-		Header: make(map[string]string),
-	}
-
-	md, ok := metadata.FromContext(ctx)
-	if ok {
-		for k, v := range md {
-			msg.Header[k] = v
-		}
-	}
-
-	// set timeout in nanoseconds
-	msg.Header["Timeout"] = fmt.Sprintf("%d", opts.RequestTimeout)
-	// set the content type for the request
-	msg.Header["Content-Type"] = req.ContentType()
-	// set the accept header
-	msg.Header["Accept"] = req.ContentType()
-
-	// setup old protocol
-	cf := setupProtocol(msg, node)
-
-	// no codec specified
-	if cf == nil {
-		var err error
-		cf, err = r.newCodec(req.ContentType())
-		if err != nil {
-			return errors.InternalServerError("go.micro.client", err.Error())
-		}
-	}
-
-	var grr error
-	c, err := r.pool.getConn(address, r.opts.Transport, transport.WithTimeout(opts.DialTimeout))
-	if err != nil {
-		return errors.InternalServerError("go.micro.client", "connection error: %v", err)
-	}
-	defer func() {
-		// defer execution of release
-		r.pool.release(address, c, grr)
-	}()
-
-	seq := atomic.LoadUint64(&r.seq)
-	atomic.AddUint64(&r.seq, 1)
-	codec := newRpcCodec(msg, c, cf)
-
-	rsp := &rpcResponse{
-		socket: c,
-		codec:  codec,
-	}
-
-	stream := &rpcStream{
-		context:  ctx,
-		request:  req,
-		response: rsp,
-		codec:    codec,
-		closed:   make(chan bool),
-		id:       fmt.Sprintf("%v", seq),
-	}
-	defer stream.Close()
-
-	ch := make(chan error, 1)
-
-	go func() {
-		defer func() {
-			if r := recover(); r != nil {
-				ch <- errors.InternalServerError("go.micro.client", "panic recovered: %v", r)
-			}
-		}()
-
-		// send request
-		if err := stream.Send(req.Body()); err != nil {
-			ch <- err
-			return
-		}
-
-		// recv request
-		if err := stream.Recv(resp); err != nil {
-			ch <- err
-			return
-		}
-
-		// success
-		ch <- nil
-	}()
-
-	select {
-	case err := <-ch:
-		grr = err
-		return err
-	case <-ctx.Done():
-		grr = ctx.Err()
-		return errors.Timeout("go.micro.client", fmt.Sprintf("%v", ctx.Err()))
-	}
-}
-
-func (r *rpcClient) stream(ctx context.Context, node *registry.Node, req Request, opts CallOptions) (Stream, error) {
-	address := node.Address
-	if node.Port > 0 {
-		address = fmt.Sprintf("%s:%d", address, node.Port)
-	}
-
-	msg := &transport.Message{
-		Header: make(map[string]string),
-	}
-
-	md, ok := metadata.FromContext(ctx)
-	if ok {
-		for k, v := range md {
-			msg.Header[k] = v
-		}
-	}
-
-	// set timeout in nanoseconds
-	msg.Header["Timeout"] = fmt.Sprintf("%d", opts.RequestTimeout)
-	// set the content type for the request
-	msg.Header["Content-Type"] = req.ContentType()
-	// set the accept header
-	msg.Header["Accept"] = req.ContentType()
-
-	// set old codecs
-	cf := setupProtocol(msg, node)
-
-	// no codec specified
-	if cf == nil {
-		var err error
-		cf, err = r.newCodec(req.ContentType())
-		if err != nil {
-			return nil, errors.InternalServerError("go.micro.client", err.Error())
-		}
-	}
-
-	dOpts := []transport.DialOption{
-		transport.WithStream(),
-	}
-
-	if opts.DialTimeout >= 0 {
-		dOpts = append(dOpts, transport.WithTimeout(opts.DialTimeout))
-	}
-
-	c, err := r.opts.Transport.Dial(address, dOpts...)
-	if err != nil {
-		return nil, errors.InternalServerError("go.micro.client", "connection error: %v", err)
-	}
-
-	codec := newRpcCodec(msg, c, cf)
-
-	rsp := &rpcResponse{
-		socket: c,
-		codec:  codec,
-	}
-
-	stream := &rpcStream{
-		context:  ctx,
-		request:  req,
-		response: rsp,
-		closed:   make(chan bool),
-		codec:    newRpcCodec(msg, c, cf),
-	}
-
-	ch := make(chan error, 1)
-
-	go func() {
-		ch <- stream.Send(req.Body())
-	}()
-
-	var grr error
-
-	select {
-	case err := <-ch:
-		grr = err
-	case <-ctx.Done():
-		grr = errors.Timeout("go.micro.client", fmt.Sprintf("%v", ctx.Err()))
-	}
-
-	if grr != nil {
-		stream.Close()
-		return nil, grr
-	}
-
-	return stream, nil
-}
-
-func (r *rpcClient) Init(opts ...Option) error {
-	size := r.opts.PoolSize
-	ttl := r.opts.PoolTTL
-
-	for _, o := range opts {
-		o(&r.opts)
-	}
-
-	// update pool configuration if the options changed
-	if size != r.opts.PoolSize || ttl != r.opts.PoolTTL {
-		r.pool.Lock()
-		r.pool.size = r.opts.PoolSize
-		r.pool.ttl = int64(r.opts.PoolTTL.Seconds())
-		r.pool.Unlock()
-	}
-
-	return nil
-}
-
-func (r *rpcClient) Options() Options {
-	return r.opts
-}
-
-func (r *rpcClient) next(request Request, opts CallOptions) (selector.Next, error) {
-	// return remote address
-	if len(opts.Address) > 0 {
-		address := opts.Address
-		port := 0
-
-		host, sport, err := net.SplitHostPort(opts.Address)
-		if err == nil {
-			address = host
-			port, _ = strconv.Atoi(sport)
-		}
-
-		return func() (*registry.Node, error) {
-			return &registry.Node{
-				Address: address,
-				Port:    port,
-			}, nil
-		}, nil
-	}
-
-	// get next nodes from the selector
-	next, err := r.opts.Selector.Select(request.Service(), opts.SelectOptions...)
-	if err != nil && err == selector.ErrNotFound {
-		return nil, errors.NotFound("go.micro.client", "service %s: %v", request.Service(), err.Error())
-	} else if err != nil {
-		return nil, errors.InternalServerError("go.micro.client", "error selecting %s node: %v", request.Service(), err.Error())
-	}
-
-	return next, nil
-}
-
-func (r *rpcClient) Call(ctx context.Context, request Request, response interface{}, opts ...CallOption) error {
-	// make a copy of call opts
-	callOpts := r.opts.CallOptions
-	for _, opt := range opts {
-		opt(&callOpts)
-	}
-
-	next, err := r.next(request, callOpts)
-	if err != nil {
-		return err
-	}
-
-	// check if we already have a deadline
-	d, ok := ctx.Deadline()
-	if !ok {
-		// no deadline so we create a new one
-		ctx, _ = context.WithTimeout(ctx, callOpts.RequestTimeout)
-	} else {
-		// got a deadline so no need to setup context
-		// but we need to set the timeout we pass along
-		opt := WithRequestTimeout(d.Sub(time.Now()))
-		opt(&callOpts)
-	}
-
-	// should we noop right here?
-	select {
-	case <-ctx.Done():
-		return errors.Timeout("go.micro.client", fmt.Sprintf("%v", ctx.Err()))
-	default:
-	}
-
-	// make copy of call method
-	rcall := r.call
-
-	// wrap the call in reverse
-	for i := len(callOpts.CallWrappers); i > 0; i-- {
-		rcall = callOpts.CallWrappers[i-1](rcall)
-	}
-
-	// return errors.New("go.micro.client", "request timeout", 408)
-	call := func(i int) error {
-		// call backoff first. Someone may want an initial start delay
-		t, err := callOpts.Backoff(ctx, request, i)
-		if err != nil {
-			return errors.InternalServerError("go.micro.client", "backoff error: %v", err.Error())
-		}
-
-		// only sleep if greater than 0
-		if t.Seconds() > 0 {
-			time.Sleep(t)
-		}
-
-		// select next node
-		node, err := next()
-		if err != nil && err == selector.ErrNotFound {
-			return errors.NotFound("go.micro.client", "service %s: %v", request.Service(), err.Error())
-		} else if err != nil {
-			return errors.InternalServerError("go.micro.client", "error getting next %s node: %v", request.Service(), err.Error())
-		}
-
-		// make the call
-		err = rcall(ctx, node, request, response, callOpts)
-		r.opts.Selector.Mark(request.Service(), node, err)
-		return err
-	}
-
-	ch := make(chan error, callOpts.Retries)
-	var gerr error
-
-	for i := 0; i <= callOpts.Retries; i++ {
-		go func(i int) {
-			ch <- call(i)
-		}(i)
-
-		select {
-		case <-ctx.Done():
-			return errors.Timeout("go.micro.client", fmt.Sprintf("call timeout: %v", ctx.Err()))
-		case err := <-ch:
-			// if the call succeeded lets bail early
-			if err == nil {
-				return nil
-			}
-
-			retry, rerr := callOpts.Retry(ctx, request, i, err)
-			if rerr != nil {
-				return rerr
-			}
-
-			if !retry {
-				return err
-			}
-
-			gerr = err
-		}
-	}
-
-	return gerr
-}
-
-func (r *rpcClient) Stream(ctx context.Context, request Request, opts ...CallOption) (Stream, error) {
-	// make a copy of call opts
-	callOpts := r.opts.CallOptions
-	for _, opt := range opts {
-		opt(&callOpts)
-	}
-
-	next, err := r.next(request, callOpts)
-	if err != nil {
-		return nil, err
-	}
-
-	// should we noop right here?
-	select {
-	case <-ctx.Done():
-		return nil, errors.Timeout("go.micro.client", fmt.Sprintf("%v", ctx.Err()))
-	default:
-	}
-
-	call := func(i int) (Stream, error) {
-		// call backoff first. Someone may want an initial start delay
-		t, err := callOpts.Backoff(ctx, request, i)
-		if err != nil {
-			return nil, errors.InternalServerError("go.micro.client", "backoff error: %v", err.Error())
-		}
-
-		// only sleep if greater than 0
-		if t.Seconds() > 0 {
-			time.Sleep(t)
-		}
-
-		node, err := next()
-		if err != nil && err == selector.ErrNotFound {
-			return nil, errors.NotFound("go.micro.client", "service %s: %v", request.Service(), err.Error())
-		} else if err != nil {
-			return nil, errors.InternalServerError("go.micro.client", "error getting next %s node: %v", request.Service(), err.Error())
-		}
-
-		stream, err := r.stream(ctx, node, request, callOpts)
-		r.opts.Selector.Mark(request.Service(), node, err)
-		return stream, err
-	}
-
-	type response struct {
-		stream Stream
-		err    error
-	}
-
-	ch := make(chan response, callOpts.Retries)
-	var grr error
-
-	for i := 0; i <= callOpts.Retries; i++ {
-		go func() {
-			s, err := call(i)
-			ch <- response{s, err}
-		}()
-
-		select {
-		case <-ctx.Done():
-			return nil, errors.Timeout("go.micro.client", fmt.Sprintf("call timeout: %v", ctx.Err()))
-		case rsp := <-ch:
-			// if the call succeeded lets bail early
-			if rsp.err == nil {
-				return rsp.stream, nil
-			}
-
-			retry, rerr := callOpts.Retry(ctx, request, i, rsp.err)
-			if rerr != nil {
-				return nil, rerr
-			}
-
-			if !retry {
-				return nil, rsp.err
-			}
-
-			grr = rsp.err
-		}
-	}
-
-	return nil, grr
-}
-
-func (r *rpcClient) Publish(ctx context.Context, msg Message, opts ...PublishOption) error {
-	md, ok := metadata.FromContext(ctx)
-	if !ok {
-		md = make(map[string]string)
-	}
-
-	id := uuid.New().String()
-	md["Content-Type"] = msg.ContentType()
-	md["Micro-Topic"] = msg.Topic()
-	md["Micro-Id"] = id
-
-	// encode message body
-	cf, err := r.newCodec(msg.ContentType())
-	if err != nil {
-		return errors.InternalServerError("go.micro.client", err.Error())
-	}
-	b := &buffer{bytes.NewBuffer(nil)}
-	if err := cf(b).Write(&codec.Message{
-		Target: msg.Topic(),
-		Type:   codec.Publication,
-		Header: map[string]string{
-			"Micro-Id":    id,
-			"Micro-Topic": msg.Topic(),
-		},
-	}, msg.Payload()); err != nil {
-		return errors.InternalServerError("go.micro.client", err.Error())
-	}
-	r.once.Do(func() {
-		r.opts.Broker.Connect()
-	})
-
-	return r.opts.Broker.Publish(msg.Topic(), &broker.Message{
-		Header: md,
-		Body:   b.Bytes(),
-	})
-}
-
-func (r *rpcClient) NewMessage(topic string, message interface{}, opts ...MessageOption) Message {
-	return newMessage(topic, message, r.opts.ContentType, opts...)
-}
-
-func (r *rpcClient) NewRequest(service, method string, request interface{}, reqOpts ...RequestOption) Request {
-	return newRequest(service, method, request, r.opts.ContentType, reqOpts...)
-}
-
-func (r *rpcClient) String() string {
-	return "rpc"
-}

client/rpc_client_test.go

@@ -1,167 +0,0 @@
-package client
-
-import (
-	"context"
-	"fmt"
-	"testing"
-
-	"github.com/micro/go-micro/errors"
-	"github.com/micro/go-micro/registry"
-	"github.com/micro/go-micro/registry/memory"
-	"github.com/micro/go-micro/selector"
-)
-
-func newTestRegistry() registry.Registry {
-	r := memory.NewRegistry()
-	r.(*memory.Registry).Setup()
-	return r
-}
-
-func TestCallAddress(t *testing.T) {
-	var called bool
-	service := "test.service"
-	endpoint := "Test.Endpoint"
-	address := "10.1.10.1"
-	port := 8080
-
-	wrap := func(cf CallFunc) CallFunc {
-		return func(ctx context.Context, node *registry.Node, req Request, rsp interface{}, opts CallOptions) error {
-			called = true
-
-			if req.Service() != service {
-				return fmt.Errorf("expected service: %s got %s", service, req.Service())
-			}
-
-			if req.Endpoint() != endpoint {
-				return fmt.Errorf("expected service: %s got %s", endpoint, req.Endpoint())
-			}
-
-			if node.Address != address {
-				return fmt.Errorf("expected address: %s got %s", address, node.Address)
-			}
-
-			if node.Port != port {
-				return fmt.Errorf("expected address: %d got %d", port, node.Port)
-			}
-
-			// don't do the call
-			return nil
-		}
-	}
-
-	r := newTestRegistry()
-	c := NewClient(
-		Registry(r),
-		WrapCall(wrap),
-	)
-	c.Options().Selector.Init(selector.Registry(r))
-
-	req := c.NewRequest(service, endpoint, nil)
-
-	// test calling remote address
-	if err := c.Call(context.Background(), req, nil, WithAddress(fmt.Sprintf("%s:%d", address, port))); err != nil {
-		t.Fatal("call with address error", err)
-	}
-
-	if !called {
-		t.Fatal("wrapper not called")
-	}
-
-}
-
-func TestCallRetry(t *testing.T) {
-	service := "test.service"
-	endpoint := "Test.Endpoint"
-	address := "10.1.10.1"
-
-	var called int
-
-	wrap := func(cf CallFunc) CallFunc {
-		return func(ctx context.Context, node *registry.Node, req Request, rsp interface{}, opts CallOptions) error {
-			called++
-			if called == 1 {
-				return errors.InternalServerError("test.error", "retry request")
-			}
-
-			// don't do the call
-			return nil
-		}
-	}
-
-	r := newTestRegistry()
-	c := NewClient(
-		Registry(r),
-		WrapCall(wrap),
-	)
-	c.Options().Selector.Init(selector.Registry(r))
-
-	req := c.NewRequest(service, endpoint, nil)
-
-	// test calling remote address
-	if err := c.Call(context.Background(), req, nil, WithAddress(address)); err != nil {
-		t.Fatal("call with address error", err)
-	}
-
-	// num calls
-	if called < c.Options().CallOptions.Retries+1 {
-		t.Fatal("request not retried")
-	}
-}
-
-func TestCallWrapper(t *testing.T) {
-	var called bool
-	id := "test.1"
-	service := "test.service"
-	endpoint := "Test.Endpoint"
-	address := "10.1.10.1"
-	port := 8080
-
-	wrap := func(cf CallFunc) CallFunc {
-		return func(ctx context.Context, node *registry.Node, req Request, rsp interface{}, opts CallOptions) error {
-			called = true
-
-			if req.Service() != service {
-				return fmt.Errorf("expected service: %s got %s", service, req.Service())
-			}
-
-			if req.Endpoint() != endpoint {
-				return fmt.Errorf("expected service: %s got %s", endpoint, req.Endpoint())
-			}
-
-			if node.Address != address {
-				return fmt.Errorf("expected address: %s got %s", address, node.Address)
-			}
-
-			// don't do the call
-			return nil
-		}
-	}
-
-	r := newTestRegistry()
-	c := NewClient(
-		Registry(r),
-		WrapCall(wrap),
-	)
-	c.Options().Selector.Init(selector.Registry(r))
-
-	r.Register(&registry.Service{
-		Name:    service,
-		Version: "latest",
-		Nodes: []*registry.Node{
-			&registry.Node{
-				Id:      id,
-				Address: address,
-				Port:    port,
-			},
-		},
-	})
-
-	req := c.NewRequest(service, endpoint, nil)
-	if err := c.Call(context.Background(), req, nil); err != nil {
-		t.Fatal("call wrapper error", err)
-	}
-
-	if !called {
-		t.Fatal("wrapper not called")
-	}
-}

client/rpc_codec.go

@@ -1,259 +0,0 @@
-package client
-
-import (
-	"bytes"
-	errs "errors"
-
-	"github.com/micro/go-micro/codec"
-	raw "github.com/micro/go-micro/codec/bytes"
-	"github.com/micro/go-micro/codec/grpc"
-	"github.com/micro/go-micro/codec/json"
-	"github.com/micro/go-micro/codec/jsonrpc"
-	"github.com/micro/go-micro/codec/proto"
-	"github.com/micro/go-micro/codec/protorpc"
-	"github.com/micro/go-micro/errors"
-	"github.com/micro/go-micro/registry"
-	"github.com/micro/go-micro/transport"
-)
-
-const (
-	lastStreamResponseError = "EOS"
-)
-
-// serverError represents an error that has been returned from
-// the remote side of the RPC connection.
-type serverError string
-
-func (e serverError) Error() string {
-	return string(e)
-}
-
-// errShutdown holds the specific error for closing/closed connections
-var (
-	errShutdown = errs.New("connection is shut down")
-)
-
-type rpcCodec struct {
-	client transport.Client
-	codec  codec.Codec
-
-	req *transport.Message
-	buf *readWriteCloser
-}
-
-type readWriteCloser struct {
-	wbuf *bytes.Buffer
-	rbuf *bytes.Buffer
-}
-
-var (
-	DefaultContentType = "application/protobuf"
-
-	DefaultCodecs = map[string]codec.NewCodec{
-		"application/grpc":         grpc.NewCodec,
-		"application/grpc+json":    grpc.NewCodec,
-		"application/grpc+proto":   grpc.NewCodec,
-		"application/protobuf":     proto.NewCodec,
-		"application/json":         json.NewCodec,
-		"application/json-rpc":     jsonrpc.NewCodec,
-		"application/proto-rpc":    protorpc.NewCodec,
-		"application/octet-stream": raw.NewCodec,
-	}
-
-	// TODO: remove legacy codec list
-	defaultCodecs = map[string]codec.NewCodec{
-		"application/json":         jsonrpc.NewCodec,
-		"application/json-rpc":     jsonrpc.NewCodec,
-		"application/protobuf":     protorpc.NewCodec,
-		"application/proto-rpc":    protorpc.NewCodec,
-		"application/octet-stream": protorpc.NewCodec,
-	}
-)
-
-func (rwc *readWriteCloser) Read(p []byte) (n int, err error) {
-	return rwc.rbuf.Read(p)
-}
-
-func (rwc *readWriteCloser) Write(p []byte) (n int, err error) {
-	return rwc.wbuf.Write(p)
-}
-
-func (rwc *readWriteCloser) Close() error {
-	rwc.rbuf.Reset()
-	rwc.wbuf.Reset()
-	return nil
-}
-
-func getHeaders(m *codec.Message) {
-	get := func(hdr string) string {
-		if hd := m.Header[hdr]; len(hd) > 0 {
-			return hd
-		}
-		// old
-		return m.Header["X-"+hdr]
-	}
-
-	// check error in header
-	if len(m.Error) == 0 {
-		m.Error = get("Micro-Error")
-	}
-
-	// check endpoint in header
-	if len(m.Endpoint) == 0 {
-		m.Endpoint = get("Micro-Endpoint")
-	}
-
-	// check method in header
-	if len(m.Method) == 0 {
-		m.Method = get("Micro-Method")
-	}
-
-	if len(m.Id) == 0 {
-		m.Id = get("Micro-Id")
-	}
-}
-
-func setHeaders(m *codec.Message) {
-	set := func(hdr, v string) {
-		m.Header[hdr] = v
-		m.Header["X-"+hdr] = v
-	}
-
-	set("Micro-Id", m.Id)
-	set("Micro-Service", m.Target)
-	set("Micro-Method", m.Method)
-	set("Micro-Endpoint", m.Endpoint)
-}
-
-// setupProtocol sets up the old protocol
-func setupProtocol(msg *transport.Message, node *registry.Node) codec.NewCodec {
-	protocol := node.Metadata["protocol"]
-
-	// got protocol
-	if len(protocol) > 0 {
-		return nil
-	}
-
-	// no protocol use old codecs
-	switch msg.Header["Content-Type"] {
-	case "application/json":
-		msg.Header["Content-Type"] = "application/json-rpc"
-	case "application/protobuf":
-		msg.Header["Content-Type"] = "application/proto-rpc"
-	}
-
-	// now return codec
-	return defaultCodecs[msg.Header["Content-Type"]]
-}
-
-func newRpcCodec(req *transport.Message, client transport.Client, c codec.NewCodec) codec.Codec {
-	rwc := &readWriteCloser{
-		wbuf: bytes.NewBuffer(nil),
-		rbuf: bytes.NewBuffer(nil),
-	}
-	r := &rpcCodec{
-		buf:    rwc,
-		client: client,
-		codec:  c(rwc),
-		req:    req,
-	}
-	return r
-}
-
-func (c *rpcCodec) Write(m *codec.Message, body interface{}) error {
-	c.buf.wbuf.Reset()
-
-	// create header
-	if m.Header == nil {
-		m.Header = map[string]string{}
-	}
-
-	// copy original header
-	for k, v := range c.req.Header {
-		m.Header[k] = v
-	}
-
-	// set the mucp headers
-	setHeaders(m)
-
-	// if body is bytes Frame don't encode
-	if body != nil {
-		b, ok := body.(*raw.Frame)
-		if ok {
-			// set body
-			m.Body = b.Data
-			body = nil
-		}
-	}
-
-	if len(m.Body) == 0 {
-		// write to codec
-		if err := c.codec.Write(m, body); err != nil {
-			return errors.InternalServerError("go.micro.client.codec", err.Error())
-		}
-		// set body
-		m.Body = c.buf.wbuf.Bytes()
-	}
-
-	// create new transport message
-	msg := transport.Message{
-		Header: m.Header,
-		Body:   m.Body,
-	}
-
-	// send the request
-	if err := c.client.Send(&msg); err != nil {
-		return errors.InternalServerError("go.micro.client.transport", err.Error())
-	}
-
-	return nil
-}
-
-func (c *rpcCodec) ReadHeader(m *codec.Message, r codec.MessageType) error {
-	var tm transport.Message
-
-	// read message from transport
-	if err := c.client.Recv(&tm); err != nil {
-		return errors.InternalServerError("go.micro.client.transport", err.Error())
-	}
-
-	c.buf.rbuf.Reset()
-	c.buf.rbuf.Write(tm.Body)
-
-	// set headers from transport
-	m.Header = tm.Header
-
-	// read header
-	err := c.codec.ReadHeader(m, r)
-
-	// get headers
-	getHeaders(m)
-
-	// return header error
-	if err != nil {
-		return errors.InternalServerError("go.micro.client.codec", err.Error())
-	}
-
-	return nil
-}
-
-func (c *rpcCodec) ReadBody(b interface{}) error {
-	// read body
-	if err := c.codec.ReadBody(b); err != nil {
-		return errors.InternalServerError("go.micro.client.codec", err.Error())
-	}
-	return nil
-}
-
-func (c *rpcCodec) Close() error {
-	c.buf.Close()
-	c.codec.Close()
-	if err := c.client.Close(); err != nil {
-		return errors.InternalServerError("go.micro.client.transport", err.Error())
-	}
-	return nil
-}
-
-func (c *rpcCodec) String() string {
-	return "rpc"
-}

client/rpc_message.go

@@ -1,36 +0,0 @@
-package client
-
-type message struct {
-	topic       string
-	contentType string
-	payload     interface{}
-}
-
-func newMessage(topic string, payload interface{}, contentType string, opts ...MessageOption) Message {
-	var options MessageOptions
-	for _, o := range opts {
-		o(&options)
-	}
-
-	if len(options.ContentType) > 0 {
-		contentType = options.ContentType
-	}
-
-	return &message{
-		payload:     payload,
-		topic:       topic,
-		contentType: contentType,
-	}
-}
-
-func (m *message) ContentType() string {
-	return m.contentType
-}
-
-func (m *message) Topic() string {
-	return m.topic
-}
-
-func (m *message) Payload() interface{} {
-	return m.payload
-}

client/rpc_pool.go

@@ -1,87 +0,0 @@
-package client
-
-import (
-	"sync"
-	"time"
-
-	"github.com/micro/go-micro/transport"
-)
-
-type pool struct {
-	size int
-	ttl  int64
-
-	sync.Mutex
-	conns map[string][]*poolConn
-}
-
-type poolConn struct {
-	transport.Client
-	created int64
-}
-
-func newPool(size int, ttl time.Duration) *pool {
-	return &pool{
-		size:  size,
-		ttl:   int64(ttl.Seconds()),
-		conns: make(map[string][]*poolConn),
-	}
-}
-
-// NoOp the Close since we manage it
-func (p *poolConn) Close() error {
-	return nil
-}
-
-func (p *pool) getConn(addr string, tr transport.Transport, opts ...transport.DialOption) (*poolConn, error) {
-	p.Lock()
-	conns := p.conns[addr]
-	now := time.Now().Unix()
-
-	// while we have conns check age and then return one
-	// otherwise we'll create a new conn
-	for len(conns) > 0 {
-		conn := conns[len(conns)-1]
-		conns = conns[:len(conns)-1]
-		p.conns[addr] = conns
-
-		// if conn is old kill it and move on
-		if d := now - conn.created; d > p.ttl {
-			conn.Client.Close()
-			continue
-		}
-
-		// we got a good conn, lets unlock and return it
-		p.Unlock()
-
-		return conn, nil
-	}
-
-	p.Unlock()
-
-	// create new conn
-	c, err := tr.Dial(addr, opts...)
-	if err != nil {
-		return nil, err
-	}
-	return &poolConn{c, time.Now().Unix()}, nil
-}
-
-func (p *pool) release(addr string, conn *poolConn, err error) {
-	// don't store the conn if it has errored
-	if err != nil {
-		conn.Client.Close()
-		return
-	}
-
-	// otherwise put it back for reuse
-	p.Lock()
-	conns := p.conns[addr]
-	if len(conns) >= p.size {
-		p.Unlock()
-		conn.Client.Close()
-		return
-	}
-	p.conns[addr] = append(conns, conn)
-	p.Unlock()
-}

client/rpc_pool_test.go

@@ -1,84 +0,0 @@
-package client
-
-import (
-	"testing"
-	"time"
-
-	"github.com/micro/go-micro/transport"
-	"github.com/micro/go-micro/transport/memory"
-)
-
-func testPool(t *testing.T, size int, ttl time.Duration) {
-	// zero pool
-	p := newPool(size, ttl)
-
-	// mock transport
-	tr := memory.NewTransport()
-
-	// listen
-	l, err := tr.Listen(":0")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer l.Close()
-
-	// accept loop
-	go func() {
-		for {
-			if err := l.Accept(func(s transport.Socket) {
-				for {
-					var msg transport.Message
-					if err := s.Recv(&msg); err != nil {
-						return
-					}
-					if err := s.Send(&msg); err != nil {
-						return
-					}
-				}
-			}); err != nil {
-				return
-			}
-		}
-	}()
-
-	for i := 0; i < 10; i++ {
-		// get a conn
-		c, err := p.getConn(l.Addr(), tr)
-		if err != nil {
-			t.Fatal(err)
-		}
-
-		msg := &transport.Message{
-			Body: []byte(`hello world`),
-		}
-
-		if err := c.Send(msg); err != nil {
-			t.Fatal(err)
-		}
-
-		var rcv transport.Message
-
-		if err := c.Recv(&rcv); err != nil {
-			t.Fatal(err)
-		}
-
-		if string(rcv.Body) != string(msg.Body) {
-			t.Fatalf("got %v, expected %v", rcv.Body, msg.Body)
-		}
-
-		// release the conn
-		p.release(l.Addr(), c, nil)
-
-		p.Lock()
-		if i := len(p.conns[l.Addr()]); i > size {
-			p.Unlock()
-			t.Fatalf("pool size %d is greater than expected %d", i, size)
-		}
-		p.Unlock()
-	}
-}
-
-func TestRPCPool(t *testing.T) {
-	testPool(t, 0, time.Minute)
-	testPool(t, 2, time.Minute)
-}

client/rpc_request.go

@@ -1,65 +0,0 @@
-package client
-
-import (
-	"github.com/micro/go-micro/codec"
-)
-
-type rpcRequest struct {
-	service     string
-	method      string
-	endpoint    string
-	contentType string
-	codec       codec.Codec
-	body        interface{}
-	opts        RequestOptions
-}
-
-func newRequest(service, endpoint string, request interface{}, contentType string, reqOpts ...RequestOption) Request {
-	var opts RequestOptions
-
-	for _, o := range reqOpts {
-		o(&opts)
-	}
-
-	// set the content-type specified
-	if len(opts.ContentType) > 0 {
-		contentType = opts.ContentType
-	}
-
-	return &rpcRequest{
-		service:     service,
-		method:      endpoint,
-		endpoint:    endpoint,
-		body:        request,
-		contentType: contentType,
-		opts:        opts,
-	}
-}
-
-func (r *rpcRequest) ContentType() string {
-	return r.contentType
-}
-
-func (r *rpcRequest) Service() string {
-	return r.service
-}
-
-func (r *rpcRequest) Method() string {
-	return r.method
-}
-
-func (r *rpcRequest) Endpoint() string {
-	return r.endpoint
-}
-
-func (r *rpcRequest) Body() interface{} {
-	return r.body
-}
-
-func (r *rpcRequest) Codec() codec.Writer {
-	return r.codec
-}
-
-func (r *rpcRequest) Stream() bool {
-	return r.opts.Stream
-}

client/rpc_request_test.go

@@ -1,23 +0,0 @@
-package client
-
-import (
-	"testing"
-)
-
-func TestRequestOptions(t *testing.T) {
-	r := newRequest("service", "endpoint", nil, "application/json")
-	if r.Service() != "service" {
-		t.Fatalf("expected 'service' got %s", r.Service())
-	}
-	if r.Endpoint() != "endpoint" {
-		t.Fatalf("expected 'endpoint' got %s", r.Endpoint())
-	}
-	if r.ContentType() != "application/json" {
-		t.Fatalf("expected 'endpoint' got %s", r.ContentType())
-	}
-
-	r2 := newRequest("service", "endpoint", nil, "application/json", WithContentType("application/protobuf"))
-	if r2.ContentType() != "application/protobuf" {
-		t.Fatalf("expected 'endpoint' got %s", r2.ContentType())
-	}
-}

client/rpc_response.go

@@ -1,35 +0,0 @@
-package client
-
-import (
-	"github.com/micro/go-micro/codec"
-	"github.com/micro/go-micro/transport"
-)
-
-type rpcResponse struct {
-	header map[string]string
-	body   []byte
-	socket transport.Socket
-	codec  codec.Codec
-}
-
-func (r *rpcResponse) Codec() codec.Reader {
-	return r.codec
-}
-
-func (r *rpcResponse) Header() map[string]string {
-	return r.header
-}
-
-func (r *rpcResponse) Read() ([]byte, error) {
-	var msg transport.Message
-
-	if err := r.socket.Recv(&msg); err != nil {
-		return nil, err
-	}
-
-	// set internals
-	r.header = msg.Header
-	r.body = msg.Body
-
-	return msg.Body, nil
-}

client/rpc_stream.go

@@ -1,125 +0,0 @@
-package client
-
-import (
-	"context"
-	"io"
-	"sync"
-
-	"github.com/micro/go-micro/codec"
-)
-
-// Implements the streamer interface
-type rpcStream struct {
-	sync.RWMutex
-	id       string
-	closed   chan bool
-	err      error
-	request  Request
-	response Response
-	codec    codec.Codec
-	context  context.Context
-}
-
-func (r *rpcStream) isClosed() bool {
-	select {
-	case <-r.closed:
-		return true
-	default:
-		return false
-	}
-}
-
-func (r *rpcStream) Context() context.Context {
-	return r.context
-}
-
-func (r *rpcStream) Request() Request {
-	return r.request
-}
-
-func (r *rpcStream) Response() Response {
-	return r.response
-}
-
-func (r *rpcStream) Send(msg interface{}) error {
-	r.Lock()
-	defer r.Unlock()
-
-	if r.isClosed() {
-		r.err = errShutdown
-		return errShutdown
-	}
-
-	req := codec.Message{
-		Id:       r.id,
-		Target:   r.request.Service(),
-		Method:   r.request.Method(),
-		Endpoint: r.request.Endpoint(),
-		Type:     codec.Request,
-	}
-
-	if err := r.codec.Write(&req, msg); err != nil {
-		r.err = err
-		return err
-	}
-
-	return nil
-}
-
-func (r *rpcStream) Recv(msg interface{}) error {
-	r.Lock()
-	defer r.Unlock()
-
-	if r.isClosed() {
-		r.err = errShutdown
-		return errShutdown
-	}
-
-	var resp codec.Message
-
-	if err := r.codec.ReadHeader(&resp, codec.Response); err != nil {
-		if err == io.EOF && !r.isClosed() {
-			r.err = io.ErrUnexpectedEOF
-			return io.ErrUnexpectedEOF
-		}
-		r.err = err
-		return err
-	}
-
-	switch {
-	case len(resp.Error) > 0:
-		// We've got an error response. Give this to the request;
-		// any subsequent requests will get the ReadResponseBody
-		// error if there is one.
-		if resp.Error != lastStreamResponseError {
-			r.err = serverError(resp.Error)
-		} else {
-			r.err = io.EOF
-		}
-		if err := r.codec.ReadBody(nil); err != nil {
-			r.err = err
-		}
-	default:
-		if err := r.codec.ReadBody(msg); err != nil {
-			r.err = err
-		}
-	}
-
-	return r.err
-}
-
-func (r *rpcStream) Error() error {
-	r.RLock()
-	defer r.RUnlock()
-	return r.err
-}
-
-func (r *rpcStream) Close() error {
-	select {
-	case <-r.closed:
-		return nil
-	default:
-		close(r.closed)
-		return r.codec.Close()
-	}
-}

client/test_request.go

@@ -0,0 +1,43 @@
+package client
+
+import (
+	"go.unistack.org/micro/v4/codec"
+)
+
+type testRequest struct {
+	codec       codec.Codec
+	body        interface{}
+	service     string
+	method      string
+	endpoint    string
+	contentType string
+	opts        RequestOptions
+}
+
+func (r *testRequest) ContentType() string {
+	return r.contentType
+}
+
+func (r *testRequest) Service() string {
+	return r.service
+}
+
+func (r *testRequest) Method() string {
+	return r.method
+}
+
+func (r *testRequest) Endpoint() string {
+	return r.endpoint
+}
+
+func (r *testRequest) Body() interface{} {
+	return r.body
+}
+
+func (r *testRequest) Codec() codec.Codec {
+	return r.codec
+}
+
+func (r *testRequest) Stream() bool {
+	return r.opts.Stream
+}

client/wrapper.go

@@ -2,12 +2,10 @@ package client
 
 import (
 	"context"
-
-	"github.com/micro/go-micro/registry"
 )
 
 // CallFunc represents the individual call func
-type CallFunc func(ctx context.Context, node *registry.Node, req Request, rsp interface{}, opts CallOptions) error
+type CallFunc func(ctx context.Context, addr string, req Request, rsp interface{}, opts CallOptions) error
 
 // CallWrapper is a low level wrapper for the CallFunc
 type CallWrapper func(CallFunc) CallFunc

cluster/cluster.go

@@ -0,0 +1,47 @@
+package cluster
+
+import (
+	"context"
+
+	"go.unistack.org/micro/v4/metadata"
+)
+
+// Message sent to member in cluster
+type Message interface {
+	// Header returns message headers
+	Header() metadata.Metadata
+	// Body returns broker message may be []byte slice or some go struct or interface
+	Body() interface{}
+}
+
+type Node interface {
+	// Name returns node name
+	Name() string
+	// Address returns node address
+	Address() string
+	// Metadata returns node metadata
+	Metadata() metadata.Metadata
+}
+
+// Cluster interface used for cluster communication across nodes
+type Cluster interface {
+	// Join is used to take an existing members and performing state sync
+	Join(ctx context.Context, addr ...string) error
+	// Leave broadcast a leave message and stop listeners
+	Leave(ctx context.Context) error
+	// Ping is used to probe live status of the node
+	Ping(ctx context.Context, node Node, payload []byte) error
+	// Members returns the cluster members
+	Members() ([]Node, error)
+	// Broadcast send message for all members in cluster, if filter is not nil, nodes may be filtered
+	// by key/value pairs
+	Broadcast(ctx context.Context, msg Message, filter ...string) error
+	// Unicast send message to single member in cluster
+	Unicast(ctx context.Context, node Node, msg Message) error
+	// Live returns cluster liveness
+	Live() bool
+	// Ready returns cluster readiness
+	Ready() bool
+	// Health returns cluster health
+	Health() bool
+}

cluster/hasql/cluster.go

@@ -0,0 +1,235 @@
+package sql
+
+import (
+	"context"
+	"database/sql"
+	"reflect"
+	"unsafe"
+
+	"golang.yandex/hasql/v2"
+)
+
+func newSQLRowError() *sql.Row {
+	row := &sql.Row{}
+	t := reflect.TypeOf(row).Elem()
+	field, _ := t.FieldByName("err")
+	rowPtr := unsafe.Pointer(row)
+	errFieldPtr := unsafe.Pointer(uintptr(rowPtr) + field.Offset)
+	errPtr := (*error)(errFieldPtr)
+	*errPtr = ErrorNoAliveNodes
+	return row
+}
+
+type ClusterQuerier interface {
+	Querier
+	WaitForNodes(ctx context.Context, criterion ...hasql.NodeStateCriterion) error
+}
+
+type Cluster struct {
+	hasql   *hasql.Cluster[Querier]
+	options ClusterOptions
+}
+
+// NewCluster returns [Querier] that provides cluster of nodes
+func NewCluster[T Querier](opts ...ClusterOption) (ClusterQuerier, error) {
+	options := ClusterOptions{Context: context.Background()}
+	for _, opt := range opts {
+		opt(&options)
+	}
+	if options.NodeChecker == nil {
+		return nil, ErrClusterChecker
+	}
+	if options.NodeDiscoverer == nil {
+		return nil, ErrClusterDiscoverer
+	}
+	if options.NodePicker == nil {
+		return nil, ErrClusterPicker
+	}
+
+	if options.Retries < 1 {
+		options.Retries = 1
+	}
+
+	if options.NodeStateCriterion == 0 {
+		options.NodeStateCriterion = hasql.Primary
+	}
+
+	options.Options = append(options.Options, hasql.WithNodePicker(options.NodePicker))
+	if p, ok := options.NodePicker.(*CustomPicker[Querier]); ok {
+		p.opts.Priority = options.NodePriority
+	}
+
+	c, err := hasql.NewCluster(
+		options.NodeDiscoverer,
+		options.NodeChecker,
+		options.Options...,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Cluster{hasql: c, options: options}, nil
+}
+
+func (c *Cluster) BeginTx(ctx context.Context, opts *sql.TxOptions) (*sql.Tx, error) {
+	var tx *sql.Tx
+	var err error
+
+	retries := 0
+	c.hasql.NodesIter(c.getNodeStateCriterion(ctx))(func(n *hasql.Node[Querier]) bool {
+		for ; retries < c.options.Retries; retries++ {
+			if tx, err = n.DB().BeginTx(ctx, opts); err != nil && retries >= c.options.Retries {
+				return true
+			}
+		}
+		return false
+	})
+
+	if tx == nil && err == nil {
+		err = ErrorNoAliveNodes
+	}
+
+	return tx, err
+}
+
+func (c *Cluster) Close() error {
+	return c.hasql.Close()
+}
+
+func (c *Cluster) Conn(ctx context.Context) (*sql.Conn, error) {
+	var conn *sql.Conn
+	var err error
+
+	retries := 0
+	c.hasql.NodesIter(c.getNodeStateCriterion(ctx))(func(n *hasql.Node[Querier]) bool {
+		for ; retries < c.options.Retries; retries++ {
+			if conn, err = n.DB().Conn(ctx); err != nil && retries >= c.options.Retries {
+				return true
+			}
+		}
+		return false
+	})
+
+	if conn == nil && err == nil {
+		err = ErrorNoAliveNodes
+	}
+
+	return conn, err
+}
+
+func (c *Cluster) ExecContext(ctx context.Context, query string, args ...interface{}) (sql.Result, error) {
+	var res sql.Result
+	var err error
+
+	retries := 0
+	c.hasql.NodesIter(c.getNodeStateCriterion(ctx))(func(n *hasql.Node[Querier]) bool {
+		for ; retries < c.options.Retries; retries++ {
+			if res, err = n.DB().ExecContext(ctx, query, args...); err != nil && retries >= c.options.Retries {
+				return true
+			}
+		}
+		return false
+	})
+
+	if res == nil && err == nil {
+		err = ErrorNoAliveNodes
+	}
+
+	return res, err
+}
+
+func (c *Cluster) PrepareContext(ctx context.Context, query string) (*sql.Stmt, error) {
+	var res *sql.Stmt
+	var err error
+
+	retries := 0
+	c.hasql.NodesIter(c.getNodeStateCriterion(ctx))(func(n *hasql.Node[Querier]) bool {
+		for ; retries < c.options.Retries; retries++ {
+			if res, err = n.DB().PrepareContext(ctx, query); err != nil && retries >= c.options.Retries {
+				return true
+			}
+		}
+		return false
+	})
+
+	if res == nil && err == nil {
+		err = ErrorNoAliveNodes
+	}
+
+	return res, err
+}
+
+func (c *Cluster) QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error) {
+	var res *sql.Rows
+	var err error
+
+	retries := 0
+	c.hasql.NodesIter(c.getNodeStateCriterion(ctx))(func(n *hasql.Node[Querier]) bool {
+		for ; retries < c.options.Retries; retries++ {
+			if res, err = n.DB().QueryContext(ctx, query); err != nil && err != sql.ErrNoRows && retries >= c.options.Retries {
+				return true
+			}
+		}
+		return false
+	})
+
+	if res == nil && err == nil {
+		err = ErrorNoAliveNodes
+	}
+
+	return res, err
+}
+
+func (c *Cluster) QueryRowContext(ctx context.Context, query string, args ...interface{}) *sql.Row {
+	var res *sql.Row
+
+	retries := 0
+	c.hasql.NodesIter(c.getNodeStateCriterion(ctx))(func(n *hasql.Node[Querier]) bool {
+		for ; retries < c.options.Retries; retries++ {
+			res = n.DB().QueryRowContext(ctx, query, args...)
+			if res.Err() == nil {
+				return false
+			} else if res.Err() != nil && retries >= c.options.Retries {
+				return false
+			}
+		}
+		return true
+	})
+
+	if res == nil {
+		res = newSQLRowError()
+	}
+
+	return res
+}
+
+func (c *Cluster) PingContext(ctx context.Context) error {
+	var err error
+	var ok bool
+
+	retries := 0
+	c.hasql.NodesIter(c.getNodeStateCriterion(ctx))(func(n *hasql.Node[Querier]) bool {
+		ok = true
+		for ; retries < c.options.Retries; retries++ {
+			if err = n.DB().PingContext(ctx); err != nil && retries >= c.options.Retries {
+				return true
+			}
+		}
+		return false
+	})
+
+	if !ok {
+		err = ErrorNoAliveNodes
+	}
+
+	return err
+}
+
+func (c *Cluster) WaitForNodes(ctx context.Context, criterions ...hasql.NodeStateCriterion) error {
+	for _, criterion := range criterions {
+		if _, err := c.hasql.WaitForNode(ctx, criterion); err != nil {
+			return err
+		}
+	}
+	return nil
+}

cluster/hasql/cluster_test.go

@@ -0,0 +1,171 @@
+package sql
+
+import (
+	"context"
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/DATA-DOG/go-sqlmock"
+	"golang.yandex/hasql/v2"
+)
+
+func TestNewCluster(t *testing.T) {
+	dbMaster, dbMasterMock, err := sqlmock.New(sqlmock.MonitorPingsOption(true))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer dbMaster.Close()
+	dbMasterMock.MatchExpectationsInOrder(false)
+
+	dbMasterMock.ExpectQuery(`.*pg_is_in_recovery.*`).WillReturnRows(
+		sqlmock.NewRowsWithColumnDefinition(
+			sqlmock.NewColumn("role").OfType("int8", 0),
+			sqlmock.NewColumn("replication_lag").OfType("int8", 0)).
+			AddRow(1, 0)).
+		RowsWillBeClosed().
+		WithoutArgs()
+
+	dbMasterMock.ExpectQuery(`SELECT node_name as name`).WillReturnRows(
+		sqlmock.NewRows([]string{"name"}).
+			AddRow("master-dc1"))
+
+	dbDRMaster, dbDRMasterMock, err := sqlmock.New(sqlmock.MonitorPingsOption(true))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer dbDRMaster.Close()
+	dbDRMasterMock.MatchExpectationsInOrder(false)
+
+	dbDRMasterMock.ExpectQuery(`.*pg_is_in_recovery.*`).WillReturnRows(
+		sqlmock.NewRowsWithColumnDefinition(
+			sqlmock.NewColumn("role").OfType("int8", 0),
+			sqlmock.NewColumn("replication_lag").OfType("int8", 0)).
+			AddRow(2, 40)).
+		RowsWillBeClosed().
+		WithoutArgs()
+
+	dbDRMasterMock.ExpectQuery(`SELECT node_name as name`).WillReturnRows(
+		sqlmock.NewRows([]string{"name"}).
+			AddRow("drmaster1-dc2"))
+
+	dbDRMasterMock.ExpectQuery(`SELECT node_name as name`).WillReturnRows(
+		sqlmock.NewRows([]string{"name"}).
+			AddRow("drmaster"))
+
+	dbSlaveDC1, dbSlaveDC1Mock, err := sqlmock.New(sqlmock.MonitorPingsOption(true))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer dbSlaveDC1.Close()
+	dbSlaveDC1Mock.MatchExpectationsInOrder(false)
+
+	dbSlaveDC1Mock.ExpectQuery(`.*pg_is_in_recovery.*`).WillReturnRows(
+		sqlmock.NewRowsWithColumnDefinition(
+			sqlmock.NewColumn("role").OfType("int8", 0),
+			sqlmock.NewColumn("replication_lag").OfType("int8", 0)).
+			AddRow(2, 50)).
+		RowsWillBeClosed().
+		WithoutArgs()
+
+	dbSlaveDC1Mock.ExpectQuery(`SELECT node_name as name`).WillReturnRows(
+		sqlmock.NewRows([]string{"name"}).
+			AddRow("slave-dc1"))
+
+	dbSlaveDC2, dbSlaveDC2Mock, err := sqlmock.New(sqlmock.MonitorPingsOption(true))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer dbSlaveDC2.Close()
+	dbSlaveDC1Mock.MatchExpectationsInOrder(false)
+
+	dbSlaveDC2Mock.ExpectQuery(`.*pg_is_in_recovery.*`).WillReturnRows(
+		sqlmock.NewRowsWithColumnDefinition(
+			sqlmock.NewColumn("role").OfType("int8", 0),
+			sqlmock.NewColumn("replication_lag").OfType("int8", 0)).
+			AddRow(2, 50)).
+		RowsWillBeClosed().
+		WithoutArgs()
+
+	dbSlaveDC2Mock.ExpectQuery(`SELECT node_name as name`).WillReturnRows(
+		sqlmock.NewRows([]string{"name"}).
+			AddRow("slave-dc1"))
+
+	tctx, cancel := context.WithTimeout(t.Context(), 10*time.Second)
+	defer cancel()
+
+	c, err := NewCluster[Querier](
+		WithClusterContext(tctx),
+		WithClusterNodeChecker(hasql.PostgreSQLChecker),
+		WithClusterNodePicker(NewCustomPicker[Querier](
+			CustomPickerMaxLag(100),
+		)),
+		WithClusterNodes(
+			ClusterNode{"slave-dc1", dbSlaveDC1, 1},
+			ClusterNode{"master-dc1", dbMaster, 1},
+			ClusterNode{"slave-dc2", dbSlaveDC2, 2},
+			ClusterNode{"drmaster1-dc2", dbDRMaster, 0},
+		),
+		WithClusterOptions(
+			hasql.WithUpdateInterval[Querier](2*time.Second),
+			hasql.WithUpdateTimeout[Querier](1*time.Second),
+		),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer c.Close()
+
+	if err = c.WaitForNodes(tctx, hasql.Primary, hasql.Standby); err != nil {
+		t.Fatal(err)
+	}
+
+	time.Sleep(500 * time.Millisecond)
+
+	node1Name := ""
+	fmt.Printf("check for Standby\n")
+	if row := c.QueryRowContext(NodeStateCriterion(tctx, hasql.Standby), "SELECT node_name as name"); row.Err() != nil {
+		t.Fatal(row.Err())
+	} else if err = row.Scan(&node1Name); err != nil {
+		t.Fatal(err)
+	} else if "slave-dc1" != node1Name {
+		t.Fatalf("invalid node name %s != %s", "slave-dc1", node1Name)
+	}
+
+	dbSlaveDC1Mock.ExpectQuery(`SELECT node_name as name`).WillReturnRows(
+		sqlmock.NewRows([]string{"name"}).
+			AddRow("slave-dc1"))
+
+	node2Name := ""
+	fmt.Printf("check for PreferStandby\n")
+	if row := c.QueryRowContext(NodeStateCriterion(tctx, hasql.PreferStandby), "SELECT node_name as name"); row.Err() != nil {
+		t.Fatal(row.Err())
+	} else if err = row.Scan(&node2Name); err != nil {
+		t.Fatal(err)
+	} else if "slave-dc1" != node2Name {
+		t.Fatalf("invalid node name %s != %s", "slave-dc1", node2Name)
+	}
+
+	node3Name := ""
+	fmt.Printf("check for PreferPrimary\n")
+	if row := c.QueryRowContext(NodeStateCriterion(tctx, hasql.PreferPrimary), "SELECT node_name as name"); row.Err() != nil {
+		t.Fatal(row.Err())
+	} else if err = row.Scan(&node3Name); err != nil {
+		t.Fatal(err)
+	} else if "master-dc1" != node3Name {
+		t.Fatalf("invalid node name %s != %s", "master-dc1", node3Name)
+	}
+
+	dbSlaveDC1Mock.ExpectQuery(`.*`).WillReturnRows(sqlmock.NewRows([]string{"role"}).RowError(1, fmt.Errorf("row error")))
+
+	time.Sleep(2 * time.Second)
+
+	fmt.Printf("check for PreferStandby\n")
+	if row := c.QueryRowContext(NodeStateCriterion(tctx, hasql.PreferStandby), "SELECT node_name as name"); row.Err() == nil {
+		t.Fatal("must return error")
+	}
+
+	if dbMasterErr := dbMasterMock.ExpectationsWereMet(); dbMasterErr != nil {
+		t.Error(dbMasterErr)
+	}
+}

cluster/hasql/db.go

@@ -0,0 +1,25 @@
+package sql
+
+import (
+	"context"
+	"database/sql"
+)
+
+type Querier interface {
+	// Basic connection methods
+	PingContext(ctx context.Context) error
+	Close() error
+
+	// Query methods with context
+	ExecContext(ctx context.Context, query string, args ...interface{}) (sql.Result, error)
+	QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error)
+	QueryRowContext(ctx context.Context, query string, args ...interface{}) *sql.Row
+
+	// Prepared statements with context
+	PrepareContext(ctx context.Context, query string) (*sql.Stmt, error)
+
+	// Transaction management with context
+	BeginTx(ctx context.Context, opts *sql.TxOptions) (*sql.Tx, error)
+
+	Conn(ctx context.Context) (*sql.Conn, error)
+}

cluster/hasql/driver.go

@@ -0,0 +1,295 @@
+package sql
+
+import (
+	"context"
+	"database/sql"
+	"database/sql/driver"
+	"io"
+	"sync"
+	"time"
+)
+
+// OpenDBWithCluster creates a [*sql.DB] that uses the [ClusterQuerier]
+func OpenDBWithCluster(db ClusterQuerier) (*sql.DB, error) {
+	driver := NewClusterDriver(db)
+	connector, err := driver.OpenConnector("")
+	if err != nil {
+		return nil, err
+	}
+	return sql.OpenDB(connector), nil
+}
+
+// ClusterDriver implements [driver.Driver] and driver.Connector for an existing [Querier]
+type ClusterDriver struct {
+	db ClusterQuerier
+}
+
+// NewClusterDriver creates a new [driver.Driver] that uses an existing [ClusterQuerier]
+func NewClusterDriver(db ClusterQuerier) *ClusterDriver {
+	return &ClusterDriver{db: db}
+}
+
+// Open implements [driver.Driver.Open]
+func (d *ClusterDriver) Open(name string) (driver.Conn, error) {
+	return d.Connect(context.Background())
+}
+
+// OpenConnector implements [driver.DriverContext.OpenConnector]
+func (d *ClusterDriver) OpenConnector(name string) (driver.Connector, error) {
+	return d, nil
+}
+
+// Connect implements [driver.Connector.Connect]
+func (d *ClusterDriver) Connect(ctx context.Context) (driver.Conn, error) {
+	conn, err := d.db.Conn(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return &dbConn{conn: conn}, nil
+}
+
+// Driver implements [driver.Connector.Driver]
+func (d *ClusterDriver) Driver() driver.Driver {
+	return d
+}
+
+// dbConn implements driver.Conn with both context and legacy methods
+type dbConn struct {
+	conn *sql.Conn
+	mu   sync.Mutex
+}
+
+// Prepare implements [driver.Conn.Prepare] (legacy method)
+func (c *dbConn) Prepare(query string) (driver.Stmt, error) {
+	return c.PrepareContext(context.Background(), query)
+}
+
+// PrepareContext implements [driver.ConnPrepareContext.PrepareContext]
+func (c *dbConn) PrepareContext(ctx context.Context, query string) (driver.Stmt, error) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	stmt, err := c.conn.PrepareContext(ctx, query)
+	if err != nil {
+		return nil, err
+	}
+
+	return &dbStmt{stmt: stmt}, nil
+}
+
+// Exec implements [driver.Execer.Exec] (legacy method)
+func (c *dbConn) Exec(query string, args []driver.Value) (driver.Result, error) {
+	namedArgs := make([]driver.NamedValue, len(args))
+	for i, value := range args {
+		namedArgs[i] = driver.NamedValue{Value: value}
+	}
+	return c.ExecContext(context.Background(), query, namedArgs)
+}
+
+// ExecContext implements [driver.ExecerContext.ExecContext]
+func (c *dbConn) ExecContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Result, error) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	// Convert driver.NamedValue to any
+	interfaceArgs := make([]any, len(args))
+	for i, arg := range args {
+		interfaceArgs[i] = arg.Value
+	}
+
+	return c.conn.ExecContext(ctx, query, interfaceArgs...)
+}
+
+// Query implements [driver.Queryer.Query] (legacy method)
+func (c *dbConn) Query(query string, args []driver.Value) (driver.Rows, error) {
+	namedArgs := make([]driver.NamedValue, len(args))
+	for i, value := range args {
+		namedArgs[i] = driver.NamedValue{Value: value}
+	}
+	return c.QueryContext(context.Background(), query, namedArgs)
+}
+
+// QueryContext implements [driver.QueryerContext.QueryContext]
+func (c *dbConn) QueryContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Rows, error) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	// Convert driver.NamedValue to any
+	interfaceArgs := make([]any, len(args))
+	for i, arg := range args {
+		interfaceArgs[i] = arg.Value
+	}
+
+	rows, err := c.conn.QueryContext(ctx, query, interfaceArgs...)
+	if err != nil {
+		return nil, err
+	}
+
+	return &dbRows{rows: rows}, nil
+}
+
+// Begin implements [driver.Conn.Begin] (legacy method)
+func (c *dbConn) Begin() (driver.Tx, error) {
+	return c.BeginTx(context.Background(), driver.TxOptions{})
+}
+
+// BeginTx implements [driver.ConnBeginTx.BeginTx]
+func (c *dbConn) BeginTx(ctx context.Context, opts driver.TxOptions) (driver.Tx, error) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	sqlOpts := &sql.TxOptions{
+		Isolation: sql.IsolationLevel(opts.Isolation),
+		ReadOnly:  opts.ReadOnly,
+	}
+
+	tx, err := c.conn.BeginTx(ctx, sqlOpts)
+	if err != nil {
+		return nil, err
+	}
+
+	return &dbTx{tx: tx}, nil
+}
+
+// Ping implements [driver.Pinger.Ping]
+func (c *dbConn) Ping(ctx context.Context) error {
+	return c.conn.PingContext(ctx)
+}
+
+// Close implements [driver.Conn.Close]
+func (c *dbConn) Close() error {
+	return c.conn.Close()
+}
+
+// IsValid implements [driver.Validator.IsValid]
+func (c *dbConn) IsValid() bool {
+	// Ping with a short timeout to check if the connection is still valid
+	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
+	defer cancel()
+
+	return c.conn.PingContext(ctx) == nil
+}
+
+// dbStmt implements [driver.Stmt] with both context and legacy methods
+type dbStmt struct {
+	stmt *sql.Stmt
+	mu   sync.Mutex
+}
+
+// Close implements [driver.Stmt.Close]
+func (s *dbStmt) Close() error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	return s.stmt.Close()
+}
+
+// Close implements [driver.Stmt.NumInput]
+func (s *dbStmt) NumInput() int {
+	return -1 // Number of parameters is unknown
+}
+
+// Exec implements [driver.Stmt.Exec] (legacy method)
+func (s *dbStmt) Exec(args []driver.Value) (driver.Result, error) {
+	namedArgs := make([]driver.NamedValue, len(args))
+	for i, value := range args {
+		namedArgs[i] = driver.NamedValue{Value: value}
+	}
+	return s.ExecContext(context.Background(), namedArgs)
+}
+
+// ExecContext implements [driver.StmtExecContext.ExecContext]
+func (s *dbStmt) ExecContext(ctx context.Context, args []driver.NamedValue) (driver.Result, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	interfaceArgs := make([]any, len(args))
+	for i, arg := range args {
+		interfaceArgs[i] = arg.Value
+	}
+	return s.stmt.ExecContext(ctx, interfaceArgs...)
+}
+
+// Query implements [driver.Stmt.Query] (legacy method)
+func (s *dbStmt) Query(args []driver.Value) (driver.Rows, error) {
+	namedArgs := make([]driver.NamedValue, len(args))
+	for i, value := range args {
+		namedArgs[i] = driver.NamedValue{Value: value}
+	}
+	return s.QueryContext(context.Background(), namedArgs)
+}
+
+// QueryContext implements [driver.StmtQueryContext.QueryContext]
+func (s *dbStmt) QueryContext(ctx context.Context, args []driver.NamedValue) (driver.Rows, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	interfaceArgs := make([]any, len(args))
+	for i, arg := range args {
+		interfaceArgs[i] = arg.Value
+	}
+
+	rows, err := s.stmt.QueryContext(ctx, interfaceArgs...)
+	if err != nil {
+		return nil, err
+	}
+
+	return &dbRows{rows: rows}, nil
+}
+
+// dbRows implements [driver.Rows]
+type dbRows struct {
+	rows *sql.Rows
+}
+
+// Columns implements [driver.Rows.Columns]
+func (r *dbRows) Columns() []string {
+	cols, err := r.rows.Columns()
+	if err != nil {
+		// This shouldn't happen if the query was successful
+		return []string{}
+	}
+	return cols
+}
+
+// Close implements [driver.Rows.Close]
+func (r *dbRows) Close() error {
+	return r.rows.Close()
+}
+
+// Next implements [driver.Rows.Next]
+func (r *dbRows) Next(dest []driver.Value) error {
+	if !r.rows.Next() {
+		if err := r.rows.Err(); err != nil {
+			return err
+		}
+		return io.EOF
+	}
+
+	// Create a slice of interfaces to scan into
+	scanArgs := make([]any, len(dest))
+	for i := range scanArgs {
+		scanArgs[i] = &dest[i]
+	}
+
+	return r.rows.Scan(scanArgs...)
+}
+
+// dbTx implements [driver.Tx]
+type dbTx struct {
+	tx *sql.Tx
+	mu sync.Mutex
+}
+
+// Commit implements [driver.Tx.Commit]
+func (t *dbTx) Commit() error {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	return t.tx.Commit()
+}
+
+// Rollback implements [driver.Tx.Rollback]
+func (t *dbTx) Rollback() error {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	return t.tx.Rollback()
+}

cluster/hasql/driver_test.go

@@ -0,0 +1,141 @@
+package sql
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/DATA-DOG/go-sqlmock"
+	"golang.yandex/hasql/v2"
+)
+
+func TestDriver(t *testing.T) {
+	dbMaster, dbMasterMock, err := sqlmock.New(sqlmock.MonitorPingsOption(true))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer dbMaster.Close()
+	dbMasterMock.MatchExpectationsInOrder(false)
+
+	dbMasterMock.ExpectQuery(`.*pg_is_in_recovery.*`).WillReturnRows(
+		sqlmock.NewRowsWithColumnDefinition(
+			sqlmock.NewColumn("role").OfType("int8", 0),
+			sqlmock.NewColumn("replication_lag").OfType("int8", 0)).
+			AddRow(1, 0)).
+		RowsWillBeClosed().
+		WithoutArgs()
+
+	dbMasterMock.ExpectQuery(`SELECT node_name as name`).WillReturnRows(
+		sqlmock.NewRows([]string{"name"}).
+			AddRow("master-dc1"))
+
+	dbDRMaster, dbDRMasterMock, err := sqlmock.New(sqlmock.MonitorPingsOption(true))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer dbDRMaster.Close()
+	dbDRMasterMock.MatchExpectationsInOrder(false)
+
+	dbDRMasterMock.ExpectQuery(`.*pg_is_in_recovery.*`).WillReturnRows(
+		sqlmock.NewRowsWithColumnDefinition(
+			sqlmock.NewColumn("role").OfType("int8", 0),
+			sqlmock.NewColumn("replication_lag").OfType("int8", 0)).
+			AddRow(2, 40)).
+		RowsWillBeClosed().
+		WithoutArgs()
+
+	dbDRMasterMock.ExpectQuery(`SELECT node_name as name`).WillReturnRows(
+		sqlmock.NewRows([]string{"name"}).
+			AddRow("drmaster1-dc2"))
+
+	dbDRMasterMock.ExpectQuery(`SELECT node_name as name`).WillReturnRows(
+		sqlmock.NewRows([]string{"name"}).
+			AddRow("drmaster"))
+
+	dbSlaveDC1, dbSlaveDC1Mock, err := sqlmock.New(sqlmock.MonitorPingsOption(true))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer dbSlaveDC1.Close()
+	dbSlaveDC1Mock.MatchExpectationsInOrder(false)
+
+	dbSlaveDC1Mock.ExpectQuery(`.*pg_is_in_recovery.*`).WillReturnRows(
+		sqlmock.NewRowsWithColumnDefinition(
+			sqlmock.NewColumn("role").OfType("int8", 0),
+			sqlmock.NewColumn("replication_lag").OfType("int8", 0)).
+			AddRow(2, 50)).
+		RowsWillBeClosed().
+		WithoutArgs()
+
+	dbSlaveDC1Mock.ExpectQuery(`SELECT node_name as name`).WillReturnRows(
+		sqlmock.NewRows([]string{"name"}).
+			AddRow("slave-dc1"))
+
+	dbSlaveDC2, dbSlaveDC2Mock, err := sqlmock.New(sqlmock.MonitorPingsOption(true))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer dbSlaveDC2.Close()
+	dbSlaveDC1Mock.MatchExpectationsInOrder(false)
+
+	dbSlaveDC2Mock.ExpectQuery(`.*pg_is_in_recovery.*`).WillReturnRows(
+		sqlmock.NewRowsWithColumnDefinition(
+			sqlmock.NewColumn("role").OfType("int8", 0),
+			sqlmock.NewColumn("replication_lag").OfType("int8", 0)).
+			AddRow(2, 50)).
+		RowsWillBeClosed().
+		WithoutArgs()
+
+	dbSlaveDC2Mock.ExpectQuery(`SELECT node_name as name`).WillReturnRows(
+		sqlmock.NewRows([]string{"name"}).
+			AddRow("slave-dc1"))
+
+	tctx, cancel := context.WithTimeout(t.Context(), 10*time.Second)
+	defer cancel()
+
+	c, err := NewCluster[Querier](
+		WithClusterContext(tctx),
+		WithClusterNodeChecker(hasql.PostgreSQLChecker),
+		WithClusterNodePicker(NewCustomPicker[Querier](
+			CustomPickerMaxLag(100),
+		)),
+		WithClusterNodes(
+			ClusterNode{"slave-dc1", dbSlaveDC1, 1},
+			ClusterNode{"master-dc1", dbMaster, 1},
+			ClusterNode{"slave-dc2", dbSlaveDC2, 2},
+			ClusterNode{"drmaster1-dc2", dbDRMaster, 0},
+		),
+		WithClusterOptions(
+			hasql.WithUpdateInterval[Querier](2*time.Second),
+			hasql.WithUpdateTimeout[Querier](1*time.Second),
+		),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer c.Close()
+
+	if err = c.WaitForNodes(tctx, hasql.Primary, hasql.Standby); err != nil {
+		t.Fatal(err)
+	}
+
+	db, err := OpenDBWithCluster(c)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Use context methods
+	row := db.QueryRowContext(NodeStateCriterion(t.Context(), hasql.Primary), "SELECT node_name as name")
+	if err = row.Err(); err != nil {
+		t.Fatal(err)
+	}
+
+	nodeName := ""
+	if err = row.Scan(&nodeName); err != nil {
+		t.Fatal(err)
+	}
+
+	if nodeName != "master-dc1" {
+		t.Fatalf("invalid node_name %s != %s", "master-dc1", nodeName)
+	}
+}

cluster/hasql/error.go

@@ -0,0 +1,10 @@
+package sql
+
+import "errors"
+
+var (
+	ErrClusterChecker    = errors.New("cluster node checker required")
+	ErrClusterDiscoverer = errors.New("cluster node discoverer required")
+	ErrClusterPicker     = errors.New("cluster node picker required")
+	ErrorNoAliveNodes    = errors.New("cluster no alive nodes")
+)

cluster/hasql/options.go

@@ -0,0 +1,110 @@
+package sql
+
+import (
+	"context"
+	"math"
+
+	"golang.yandex/hasql/v2"
+)
+
+// ClusterOptions contains cluster specific options
+type ClusterOptions struct {
+	NodeChecker        hasql.NodeChecker
+	NodePicker         hasql.NodePicker[Querier]
+	NodeDiscoverer     hasql.NodeDiscoverer[Querier]
+	Options            []hasql.ClusterOpt[Querier]
+	Context            context.Context
+	Retries            int
+	NodePriority       map[string]int32
+	NodeStateCriterion hasql.NodeStateCriterion
+}
+
+// ClusterOption apply cluster options to ClusterOptions
+type ClusterOption func(*ClusterOptions)
+
+// WithClusterNodeChecker pass hasql.NodeChecker to cluster options
+func WithClusterNodeChecker(c hasql.NodeChecker) ClusterOption {
+	return func(o *ClusterOptions) {
+		o.NodeChecker = c
+	}
+}
+
+// WithClusterNodePicker pass hasql.NodePicker to cluster options
+func WithClusterNodePicker(p hasql.NodePicker[Querier]) ClusterOption {
+	return func(o *ClusterOptions) {
+		o.NodePicker = p
+	}
+}
+
+// WithClusterNodeDiscoverer pass hasql.NodeDiscoverer to cluster options
+func WithClusterNodeDiscoverer(d hasql.NodeDiscoverer[Querier]) ClusterOption {
+	return func(o *ClusterOptions) {
+		o.NodeDiscoverer = d
+	}
+}
+
+// WithRetries retry count on other nodes in case of error
+func WithRetries(n int) ClusterOption {
+	return func(o *ClusterOptions) {
+		o.Retries = n
+	}
+}
+
+// WithClusterContext pass context.Context to cluster options and used for checks
+func WithClusterContext(ctx context.Context) ClusterOption {
+	return func(o *ClusterOptions) {
+		o.Context = ctx
+	}
+}
+
+// WithClusterOptions pass hasql.ClusterOpt
+func WithClusterOptions(opts ...hasql.ClusterOpt[Querier]) ClusterOption {
+	return func(o *ClusterOptions) {
+		o.Options = append(o.Options, opts...)
+	}
+}
+
+// WithClusterNodeStateCriterion pass default hasql.NodeStateCriterion
+func WithClusterNodeStateCriterion(c hasql.NodeStateCriterion) ClusterOption {
+	return func(o *ClusterOptions) {
+		o.NodeStateCriterion = c
+	}
+}
+
+type ClusterNode struct {
+	Name     string
+	DB       Querier
+	Priority int32
+}
+
+// WithClusterNodes create cluster with static NodeDiscoverer
+func WithClusterNodes(cns ...ClusterNode) ClusterOption {
+	return func(o *ClusterOptions) {
+		nodes := make([]*hasql.Node[Querier], 0, len(cns))
+		if o.NodePriority == nil {
+			o.NodePriority = make(map[string]int32, len(cns))
+		}
+		for _, cn := range cns {
+			nodes = append(nodes, hasql.NewNode(cn.Name, cn.DB))
+			if cn.Priority == 0 {
+				cn.Priority = math.MaxInt32
+			}
+			o.NodePriority[cn.Name] = cn.Priority
+		}
+		o.NodeDiscoverer = hasql.NewStaticNodeDiscoverer(nodes...)
+	}
+}
+
+type nodeStateCriterionKey struct{}
+
+// NodeStateCriterion inject hasql.NodeStateCriterion to context
+func NodeStateCriterion(ctx context.Context, c hasql.NodeStateCriterion) context.Context {
+	return context.WithValue(ctx, nodeStateCriterionKey{}, c)
+}
+
+func (c *Cluster) getNodeStateCriterion(ctx context.Context) hasql.NodeStateCriterion {
+	if v, ok := ctx.Value(nodeStateCriterionKey{}).(hasql.NodeStateCriterion); ok {
+		return v
+	}
+	return c.options.NodeStateCriterion
+}

cluster/hasql/picker.go

@@ -0,0 +1,113 @@
+package sql
+
+import (
+	"fmt"
+	"math"
+	"time"
+
+	"golang.yandex/hasql/v2"
+)
+
+// compile time guard
+var _ hasql.NodePicker[Querier] = (*CustomPicker[Querier])(nil)
+
+// CustomPickerOptions holds options to pick nodes
+type CustomPickerOptions struct {
+	MaxLag   int
+	Priority map[string]int32
+	Retries  int
+}
+
+// CustomPickerOption func apply option to CustomPickerOptions
+type CustomPickerOption func(*CustomPickerOptions)
+
+// CustomPickerMaxLag specifies max lag for which node can be used
+func CustomPickerMaxLag(n int) CustomPickerOption {
+	return func(o *CustomPickerOptions) {
+		o.MaxLag = n
+	}
+}
+
+// NewCustomPicker creates new node picker
+func NewCustomPicker[T Querier](opts ...CustomPickerOption) *CustomPicker[Querier] {
+	options := CustomPickerOptions{}
+	for _, o := range opts {
+		o(&options)
+	}
+	return &CustomPicker[Querier]{opts: options}
+}
+
+// CustomPicker holds node picker options
+type CustomPicker[T Querier] struct {
+	opts CustomPickerOptions
+}
+
+// PickNode used to return specific node
+func (p *CustomPicker[T]) PickNode(cnodes []hasql.CheckedNode[T]) hasql.CheckedNode[T] {
+	for _, n := range cnodes {
+		fmt.Printf("node %s\n", n.Node.String())
+	}
+	return cnodes[0]
+}
+
+func (p *CustomPicker[T]) getPriority(nodeName string) int32 {
+	if prio, ok := p.opts.Priority[nodeName]; ok {
+		return prio
+	}
+	return math.MaxInt32 // Default to lowest priority
+}
+
+// CompareNodes used to sort nodes
+func (p *CustomPicker[T]) CompareNodes(a, b hasql.CheckedNode[T]) int {
+	// Get replication lag values
+	aLag := a.Info.(interface{ ReplicationLag() int }).ReplicationLag()
+	bLag := b.Info.(interface{ ReplicationLag() int }).ReplicationLag()
+
+	// First check that lag lower then MaxLag
+	if aLag > p.opts.MaxLag && bLag > p.opts.MaxLag {
+		return 0 // both are equal
+	}
+
+	// If one node exceeds MaxLag and the other doesn't, prefer the one that doesn't
+	if aLag > p.opts.MaxLag {
+		return 1 // b is better
+	}
+	if bLag > p.opts.MaxLag {
+		return -1 // a is better
+	}
+
+	// Get node priorities
+	aPrio := p.getPriority(a.Node.String())
+	bPrio := p.getPriority(b.Node.String())
+
+	// if both priority equals
+	if aPrio == bPrio {
+		// First compare by replication lag
+		if aLag < bLag {
+			return -1
+		}
+		if aLag > bLag {
+			return 1
+		}
+		// If replication lag is equal, compare by latency
+		aLatency := a.Info.(interface{ Latency() time.Duration }).Latency()
+		bLatency := b.Info.(interface{ Latency() time.Duration }).Latency()
+
+		if aLatency < bLatency {
+			return -1
+		}
+		if aLatency > bLatency {
+			return 1
+		}
+
+		// If lag and latency is equal
+		return 0
+	}
+
+	// If priorities are different, prefer the node with lower priority value
+	if aPrio < bPrio {
+		return -1
+	}
+
+	return 1
+}

cmd/cmd.go

@@ -1,480 +0,0 @@
-// Package cmd is an interface for parsing the command line
-package cmd
-
-import (
-	"fmt"
-	"io"
-	"math/rand"
-	"os"
-	"strings"
-	"time"
-
-	"github.com/micro/cli"
-	"github.com/micro/go-log"
-	"github.com/micro/go-micro/client"
-	"github.com/micro/go-micro/server"
-
-	// brokers
-	"github.com/micro/go-micro/broker"
-	"github.com/micro/go-micro/broker/http"
-	"github.com/micro/go-micro/broker/memory"
-
-	// registries
-	"github.com/micro/go-micro/registry"
-	"github.com/micro/go-micro/registry/consul"
-	"github.com/micro/go-micro/registry/gossip"
-	"github.com/micro/go-micro/registry/mdns"
-	rmem "github.com/micro/go-micro/registry/memory"
-
-	// selectors
-	"github.com/micro/go-micro/selector"
-	"github.com/micro/go-micro/selector/dns"
-	"github.com/micro/go-micro/selector/static"
-
-	// transports
-	"github.com/micro/go-micro/transport"
-	thttp "github.com/micro/go-micro/transport/http"
-	tmem "github.com/micro/go-micro/transport/memory"
-)
-
-type Cmd interface {
-	// The cli app within this cmd
-	App() *cli.App
-	// Adds options, parses flags and initialise
-	// exits on error
-	Init(opts ...Option) error
-	// Options set within this command
-	Options() Options
-}
-
-type cmd struct {
-	opts Options
-	app  *cli.App
-}
-
-type Option func(o *Options)
-
-var (
-	DefaultCmd = newCmd()
-
-	DefaultFlags = []cli.Flag{
-		cli.StringFlag{
-			Name:   "client",
-			EnvVar: "MICRO_CLIENT",
-			Usage:  "Client for go-micro; rpc",
-		},
-		cli.StringFlag{
-			Name:   "client_request_timeout",
-			EnvVar: "MICRO_CLIENT_REQUEST_TIMEOUT",
-			Usage:  "Sets the client request timeout. e.g 500ms, 5s, 1m. Default: 5s",
-		},
-		cli.IntFlag{
-			Name:   "client_retries",
-			EnvVar: "MICRO_CLIENT_RETRIES",
-			Usage:  "Sets the client retries. Default: 1",
-		},
-		cli.IntFlag{
-			Name:   "client_pool_size",
-			EnvVar: "MICRO_CLIENT_POOL_SIZE",
-			Usage:  "Sets the client connection pool size. Default: 1",
-		},
-		cli.StringFlag{
-			Name:   "client_pool_ttl",
-			EnvVar: "MICRO_CLIENT_POOL_TTL",
-			Usage:  "Sets the client connection pool ttl. e.g 500ms, 5s, 1m. Default: 1m",
-		},
-		cli.IntFlag{
-			Name:   "register_ttl",
-			EnvVar: "MICRO_REGISTER_TTL",
-			Usage:  "Register TTL in seconds",
-		},
-		cli.IntFlag{
-			Name:   "register_interval",
-			EnvVar: "MICRO_REGISTER_INTERVAL",
-			Usage:  "Register interval in seconds",
-		},
-		cli.StringFlag{
-			Name:   "server",
-			EnvVar: "MICRO_SERVER",
-			Usage:  "Server for go-micro; rpc",
-		},
-		cli.StringFlag{
-			Name:   "server_name",
-			EnvVar: "MICRO_SERVER_NAME",
-			Usage:  "Name of the server. go.micro.srv.example",
-		},
-		cli.StringFlag{
-			Name:   "server_version",
-			EnvVar: "MICRO_SERVER_VERSION",
-			Usage:  "Version of the server. 1.1.0",
-		},
-		cli.StringFlag{
-			Name:   "server_id",
-			EnvVar: "MICRO_SERVER_ID",
-			Usage:  "Id of the server. Auto-generated if not specified",
-		},
-		cli.StringFlag{
-			Name:   "server_address",
-			EnvVar: "MICRO_SERVER_ADDRESS",
-			Usage:  "Bind address for the server. 127.0.0.1:8080",
-		},
-		cli.StringFlag{
-			Name:   "server_advertise",
-			EnvVar: "MICRO_SERVER_ADVERTISE",
-			Usage:  "Used instead of the server_address when registering with discovery. 127.0.0.1:8080",
-		},
-		cli.StringSliceFlag{
-			Name:   "server_metadata",
-			EnvVar: "MICRO_SERVER_METADATA",
-			Value:  &cli.StringSlice{},
-			Usage:  "A list of key-value pairs defining metadata. version=1.0.0",
-		},
-		cli.StringFlag{
-			Name:   "broker",
-			EnvVar: "MICRO_BROKER",
-			Usage:  "Broker for pub/sub. http, nats, rabbitmq",
-		},
-		cli.StringFlag{
-			Name:   "broker_address",
-			EnvVar: "MICRO_BROKER_ADDRESS",
-			Usage:  "Comma-separated list of broker addresses",
-		},
-		cli.StringFlag{
-			Name:   "registry",
-			EnvVar: "MICRO_REGISTRY",
-			Usage:  "Registry for discovery. consul, mdns",
-		},
-		cli.StringFlag{
-			Name:   "registry_address",
-			EnvVar: "MICRO_REGISTRY_ADDRESS",
-			Usage:  "Comma-separated list of registry addresses",
-		},
-		cli.StringFlag{
-			Name:   "selector",
-			EnvVar: "MICRO_SELECTOR",
-			Usage:  "Selector used to pick nodes for querying",
-		},
-		cli.StringFlag{
-			Name:   "transport",
-			EnvVar: "MICRO_TRANSPORT",
-			Usage:  "Transport mechanism used; http",
-		},
-		cli.StringFlag{
-			Name:   "transport_address",
-			EnvVar: "MICRO_TRANSPORT_ADDRESS",
-			Usage:  "Comma-separated list of transport addresses",
-		},
-	}
-
-	DefaultBrokers = map[string]func(...broker.Option) broker.Broker{
-		"http":   http.NewBroker,
-		"memory": memory.NewBroker,
-	}
-
-	DefaultClients = map[string]func(...client.Option) client.Client{
-		"rpc": client.NewClient,
-	}
-
-	DefaultRegistries = map[string]func(...registry.Option) registry.Registry{
-		"consul": consul.NewRegistry,
-		"gossip": gossip.NewRegistry,
-		"mdns":   mdns.NewRegistry,
-		"memory": rmem.NewRegistry,
-	}
-
-	DefaultSelectors = map[string]func(...selector.Option) selector.Selector{
-		"default": selector.NewSelector,
-		"dns":     dns.NewSelector,
-		"cache":   selector.NewSelector,
-		"static":  static.NewSelector,
-	}
-
-	DefaultServers = map[string]func(...server.Option) server.Server{
-		"rpc": server.NewServer,
-	}
-
-	DefaultTransports = map[string]func(...transport.Option) transport.Transport{
-		"memory": tmem.NewTransport,
-		"http":   thttp.NewTransport,
-	}
-
-	// used for default selection as the fall back
-	defaultClient    = "rpc"
-	defaultServer    = "rpc"
-	defaultBroker    = "http"
-	defaultRegistry  = "mdns"
-	defaultSelector  = "registry"
-	defaultTransport = "http"
-)
-
-func init() {
-	rand.Seed(time.Now().Unix())
-	help := cli.HelpPrinter
-	cli.HelpPrinter = func(writer io.Writer, templ string, data interface{}) {
-		help(writer, templ, data)
-		os.Exit(0)
-	}
-}
-
-func newCmd(opts ...Option) Cmd {
-	options := Options{
-		Broker:    &broker.DefaultBroker,
-		Client:    &client.DefaultClient,
-		Registry:  &registry.DefaultRegistry,
-		Server:    &server.DefaultServer,
-		Selector:  &selector.DefaultSelector,
-		Transport: &transport.DefaultTransport,
-
-		Brokers:    DefaultBrokers,
-		Clients:    DefaultClients,
-		Registries: DefaultRegistries,
-		Selectors:  DefaultSelectors,
-		Servers:    DefaultServers,
-		Transports: DefaultTransports,
-	}
-
-	for _, o := range opts {
-		o(&options)
-	}
-
-	if len(options.Description) == 0 {
-		options.Description = "a go-micro service"
-	}
-
-	cmd := new(cmd)
-	cmd.opts = options
-	cmd.app = cli.NewApp()
-	cmd.app.Name = cmd.opts.Name
-	cmd.app.Version = cmd.opts.Version
-	cmd.app.Usage = cmd.opts.Description
-	cmd.app.Before = cmd.Before
-	cmd.app.Flags = DefaultFlags
-	cmd.app.Action = func(c *cli.Context) {}
-
-	if len(options.Version) == 0 {
-		cmd.app.HideVersion = true
-	}
-
-	return cmd
-}
-
-func (c *cmd) App() *cli.App {
-	return c.app
-}
-
-func (c *cmd) Options() Options {
-	return c.opts
-}
-
-func (c *cmd) Before(ctx *cli.Context) error {
-	// If flags are set then use them otherwise do nothing
-	var serverOpts []server.Option
-	var clientOpts []client.Option
-
-	// Set the client
-	if name := ctx.String("client"); len(name) > 0 {
-		// only change if we have the client and type differs
-		if cl, ok := c.opts.Clients[name]; ok && (*c.opts.Client).String() != name {
-			*c.opts.Client = cl()
-		}
-	}
-
-	// Set the server
-	if name := ctx.String("server"); len(name) > 0 {
-		// only change if we have the server and type differs
-		if s, ok := c.opts.Servers[name]; ok && (*c.opts.Server).String() != name {
-			*c.opts.Server = s()
-		}
-	}
-
-	// Set the broker
-	if name := ctx.String("broker"); len(name) > 0 && (*c.opts.Broker).String() != name {
-		b, ok := c.opts.Brokers[name]
-		if !ok {
-			return fmt.Errorf("Broker %s not found", name)
-		}
-
-		*c.opts.Broker = b()
-		serverOpts = append(serverOpts, server.Broker(*c.opts.Broker))
-		clientOpts = append(clientOpts, client.Broker(*c.opts.Broker))
-	}
-
-	// Set the registry
-	if name := ctx.String("registry"); len(name) > 0 && (*c.opts.Registry).String() != name {
-		r, ok := c.opts.Registries[name]
-		if !ok {
-			return fmt.Errorf("Registry %s not found", name)
-		}
-
-		*c.opts.Registry = r()
-		serverOpts = append(serverOpts, server.Registry(*c.opts.Registry))
-		clientOpts = append(clientOpts, client.Registry(*c.opts.Registry))
-
-		if err := (*c.opts.Selector).Init(selector.Registry(*c.opts.Registry)); err != nil {
-			log.Fatalf("Error configuring registry: %v", err)
-		}
-
-		clientOpts = append(clientOpts, client.Selector(*c.opts.Selector))
-
-		if err := (*c.opts.Broker).Init(broker.Registry(*c.opts.Registry)); err != nil {
-			log.Fatalf("Error configuring broker: %v", err)
-		}
-	}
-
-	// Set the selector
-	if name := ctx.String("selector"); len(name) > 0 && (*c.opts.Selector).String() != name {
-		s, ok := c.opts.Selectors[name]
-		if !ok {
-			return fmt.Errorf("Selector %s not found", name)
-		}
-
-		*c.opts.Selector = s(selector.Registry(*c.opts.Registry))
-
-		// No server option here. Should there be?
-		clientOpts = append(clientOpts, client.Selector(*c.opts.Selector))
-	}
-
-	// Set the transport
-	if name := ctx.String("transport"); len(name) > 0 && (*c.opts.Transport).String() != name {
-		t, ok := c.opts.Transports[name]
-		if !ok {
-			return fmt.Errorf("Transport %s not found", name)
-		}
-
-		*c.opts.Transport = t()
-		serverOpts = append(serverOpts, server.Transport(*c.opts.Transport))
-		clientOpts = append(clientOpts, client.Transport(*c.opts.Transport))
-	}
-
-	// Parse the server options
-	metadata := make(map[string]string)
-	for _, d := range ctx.StringSlice("server_metadata") {
-		var key, val string
-		parts := strings.Split(d, "=")
-		key = parts[0]
-		if len(parts) > 1 {
-			val = strings.Join(parts[1:], "=")
-		}
-		metadata[key] = val
-	}
-
-	if len(metadata) > 0 {
-		serverOpts = append(serverOpts, server.Metadata(metadata))
-	}
-
-	if len(ctx.String("broker_address")) > 0 {
-		if err := (*c.opts.Broker).Init(broker.Addrs(strings.Split(ctx.String("broker_address"), ",")...)); err != nil {
-			log.Fatalf("Error configuring broker: %v", err)
-		}
-	}
-
-	if len(ctx.String("registry_address")) > 0 {
-		if err := (*c.opts.Registry).Init(registry.Addrs(strings.Split(ctx.String("registry_address"), ",")...)); err != nil {
-			log.Fatalf("Error configuring registry: %v", err)
-		}
-	}
-
-	if len(ctx.String("transport_address")) > 0 {
-		if err := (*c.opts.Transport).Init(transport.Addrs(strings.Split(ctx.String("transport_address"), ",")...)); err != nil {
-			log.Fatalf("Error configuring transport: %v", err)
-		}
-	}
-
-	if len(ctx.String("server_name")) > 0 {
-		serverOpts = append(serverOpts, server.Name(ctx.String("server_name")))
-	}
-
-	if len(ctx.String("server_version")) > 0 {
-		serverOpts = append(serverOpts, server.Version(ctx.String("server_version")))
-	}
-
-	if len(ctx.String("server_id")) > 0 {
-		serverOpts = append(serverOpts, server.Id(ctx.String("server_id")))
-	}
-
-	if len(ctx.String("server_address")) > 0 {
-		serverOpts = append(serverOpts, server.Address(ctx.String("server_address")))
-	}
-
-	if len(ctx.String("server_advertise")) > 0 {
-		serverOpts = append(serverOpts, server.Advertise(ctx.String("server_advertise")))
-	}
-
-	if ttl := time.Duration(ctx.GlobalInt("register_ttl")); ttl > 0 {
-		serverOpts = append(serverOpts, server.RegisterTTL(ttl*time.Second))
-	}
-
-	if val := time.Duration(ctx.GlobalInt("register_interval")); val > 0 {
-		serverOpts = append(serverOpts, server.RegisterInterval(val*time.Second))
-	}
-
-	// client opts
-	if r := ctx.Int("client_retries"); r >= 0 {
-		clientOpts = append(clientOpts, client.Retries(r))
-	}
-
-	if t := ctx.String("client_request_timeout"); len(t) > 0 {
-		d, err := time.ParseDuration(t)
-		if err != nil {
-			return fmt.Errorf("failed to parse client_request_timeout: %v", t)
-		}
-		clientOpts = append(clientOpts, client.RequestTimeout(d))
-	}
-
-	if r := ctx.Int("client_pool_size"); r > 0 {
-		clientOpts = append(clientOpts, client.PoolSize(r))
-	}
-
-	if t := ctx.String("client_pool_ttl"); len(t) > 0 {
-		d, err := time.ParseDuration(t)
-		if err != nil {
-			return fmt.Errorf("failed to parse client_pool_ttl: %v", t)
-		}
-		clientOpts = append(clientOpts, client.PoolTTL(d))
-	}
-
-	// We have some command line opts for the server.
-	// Lets set it up
-	if len(serverOpts) > 0 {
-		if err := (*c.opts.Server).Init(serverOpts...); err != nil {
-			log.Fatalf("Error configuring server: %v", err)
-		}
-	}
-
-	// Use an init option?
-	if len(clientOpts) > 0 {
-		if err := (*c.opts.Client).Init(clientOpts...); err != nil {
-			log.Fatalf("Error configuring client: %v", err)
-		}
-	}
-
-	return nil
-}
-
-func (c *cmd) Init(opts ...Option) error {
-	for _, o := range opts {
-		o(&c.opts)
-	}
-	c.app.Name = c.opts.Name
-	c.app.Version = c.opts.Version
-	c.app.HideVersion = len(c.opts.Version) == 0
-	c.app.Usage = c.opts.Description
-	c.app.RunAndExitOnError()
-	return nil
-}
-
-func DefaultOptions() Options {
-	return DefaultCmd.Options()
-}
-
-func App() *cli.App {
-	return DefaultCmd.App()
-}
-
-func Init(opts ...Option) error {
-	return DefaultCmd.Init(opts...)
-}
-
-func NewCmd(opts ...Option) Cmd {
-	return newCmd(opts...)
-}

cmd/options.go

@@ -1,137 +0,0 @@
-package cmd
-
-import (
-	"context"
-
-	"github.com/micro/go-micro/broker"
-	"github.com/micro/go-micro/client"
-	"github.com/micro/go-micro/registry"
-	"github.com/micro/go-micro/selector"
-	"github.com/micro/go-micro/server"
-	"github.com/micro/go-micro/transport"
-)
-
-type Options struct {
-	// For the Command Line itself
-	Name        string
-	Description string
-	Version     string
-
-	// We need pointers to things so we can swap them out if needed.
-	Broker    *broker.Broker
-	Registry  *registry.Registry
-	Selector  *selector.Selector
-	Transport *transport.Transport
-	Client    *client.Client
-	Server    *server.Server
-
-	Brokers    map[string]func(...broker.Option) broker.Broker
-	Clients    map[string]func(...client.Option) client.Client
-	Registries map[string]func(...registry.Option) registry.Registry
-	Selectors  map[string]func(...selector.Option) selector.Selector
-	Servers    map[string]func(...server.Option) server.Server
-	Transports map[string]func(...transport.Option) transport.Transport
-
-	// Other options for implementations of the interface
-	// can be stored in a context
-	Context context.Context
-}
-
-// Command line Name
-func Name(n string) Option {
-	return func(o *Options) {
-		o.Name = n
-	}
-}
-
-// Command line Description
-func Description(d string) Option {
-	return func(o *Options) {
-		o.Description = d
-	}
-}
-
-// Command line Version
-func Version(v string) Option {
-	return func(o *Options) {
-		o.Version = v
-	}
-}
-
-func Broker(b *broker.Broker) Option {
-	return func(o *Options) {
-		o.Broker = b
-	}
-}
-
-func Selector(s *selector.Selector) Option {
-	return func(o *Options) {
-		o.Selector = s
-	}
-}
-
-func Registry(r *registry.Registry) Option {
-	return func(o *Options) {
-		o.Registry = r
-	}
-}
-
-func Transport(t *transport.Transport) Option {
-	return func(o *Options) {
-		o.Transport = t
-	}
-}
-
-func Client(c *client.Client) Option {
-	return func(o *Options) {
-		o.Client = c
-	}
-}
-
-func Server(s *server.Server) Option {
-	return func(o *Options) {
-		o.Server = s
-	}
-}
-
-// New broker func
-func NewBroker(name string, b func(...broker.Option) broker.Broker) Option {
-	return func(o *Options) {
-		o.Brokers[name] = b
-	}
-}
-
-// New client func
-func NewClient(name string, b func(...client.Option) client.Client) Option {
-	return func(o *Options) {
-		o.Clients[name] = b
-	}
-}
-
-// New registry func
-func NewRegistry(name string, r func(...registry.Option) registry.Registry) Option {
-	return func(o *Options) {
-		o.Registries[name] = r
-	}
-}
-
-// New selector func
-func NewSelector(name string, s func(...selector.Option) selector.Selector) Option {
-	return func(o *Options) {
-		o.Selectors[name] = s
-	}
-}
-
-// New server func
-func NewServer(name string, s func(...server.Option) server.Server) Option {
-	return func(o *Options) {
-		o.Servers[name] = s
-	}
-}
-
-// New transport func
-func NewTransport(name string, t func(...transport.Option) transport.Transport) Option {
-	return func(o *Options) {
-		o.Transports[name] = t
-	}
-}

codec/bytes/bytes.go

@@ -1,75 +0,0 @@
-// Package bytes provides a bytes codec which does not encode or decode anything
-package bytes
-
-import (
-	"fmt"
-	"io"
-	"io/ioutil"
-
-	"github.com/micro/go-micro/codec"
-)
-
-type Codec struct {
-	Conn io.ReadWriteCloser
-}
-
-// Frame gives us the ability to define raw data to send over the pipes
-type Frame struct {
-	Data []byte
-}
-
-func (c *Codec) ReadHeader(m *codec.Message, t codec.MessageType) error {
-	return nil
-}
-
-func (c *Codec) ReadBody(b interface{}) error {
-	// read bytes
-	buf, err := ioutil.ReadAll(c.Conn)
-	if err != nil {
-		return err
-	}
-
-	switch b.(type) {
-	case *[]byte:
-		v := b.(*[]byte)
-		*v = buf
-	case *Frame:
-		v := b.(*Frame)
-		v.Data = buf
-	default:
-		return fmt.Errorf("failed to read body: %v is not type of *[]byte", b)
-	}
-
-	return nil
-}
-
-func (c *Codec) Write(m *codec.Message, b interface{}) error {
-	var v []byte
-	switch b.(type) {
-	case *Frame:
-		v = b.(*Frame).Data
-	case *[]byte:
-		ve := b.(*[]byte)
-		v = *ve
-	case []byte:
-		v = b.([]byte)
-	default:
-		return fmt.Errorf("failed to write: %v is not type of *[]byte or []byte", b)
-	}
-	_, err := c.Conn.Write(v)
-	return err
-}
-
-func (c *Codec) Close() error {
-	return c.Conn.Close()
-}
-
-func (c *Codec) String() string {
-	return "bytes"
-}
-
-func NewCodec(c io.ReadWriteCloser) codec.Codec {
-	return &Codec{
-		Conn: c,
-	}
-}

codec/bytes/marshaler.go

@@ -1,41 +0,0 @@
-package bytes
-
-import (
-	"errors"
-)
-
-type Marshaler struct{}
-
-type Message struct {
-	Header map[string]string
-	Body   []byte
-}
-
-func (n Marshaler) Marshal(v interface{}) ([]byte, error) {
-	switch v.(type) {
-	case *[]byte:
-		ve := v.(*[]byte)
-		return *ve, nil
-	case []byte:
-		return v.([]byte), nil
-	case *Message:
-		return v.(*Message).Body, nil
-	}
-	return nil, errors.New("invalid message")
-}
-
-func (n Marshaler) Unmarshal(d []byte, v interface{}) error {
-	switch v.(type) {
-	case *[]byte:
-		ve := v.(*[]byte)
-		*ve = d
-	case *Message:
-		ve := v.(*Message)
-		ve.Body = d
-	}
-	return errors.New("invalid message")
-}
-
-func (n Marshaler) String() string {
-	return "bytes"
-}

codec/codec.go

@@ -2,62 +2,74 @@
 package codec
 
 import (
-	"io"
+	"errors"
 )
 
-const (
-	Error MessageType = iota
-	Request
-	Response
-	Publication
+var (
+	// ErrInvalidMessage returned when invalid messge passed to codec
+	ErrInvalidMessage = errors.New("invalid message")
+	// ErrUnknownContentType returned when content-type is unknown
+	ErrUnknownContentType = errors.New("unknown content-type")
 )
 
-type MessageType int
+var (
+	// DefaultCodec is the global default codec
+	DefaultCodec = NewCodec()
+	// DefaultTagName specifies struct tag name to control codec Marshal/Unmarshal
+	DefaultTagName = "codec"
+)
 
-// Takes in a connection/buffer and returns a new Codec
-type NewCodec func(io.ReadWriteCloser) Codec
-
-// Codec encodes/decodes various types of messages used within go-micro.
-// ReadHeader and ReadBody are called in pairs to read requests/responses
-// from the connection. Close is called when finished with the
-// connection. ReadBody may be called with a nil argument to force the
-// body to be read and discarded.
+// Codec encodes/decodes various types of messages.
 type Codec interface {
-	Reader
-	Writer
-	Close() error
+	Marshal(v interface{}, opts ...Option) ([]byte, error)
+	Unmarshal(b []byte, v interface{}, opts ...Option) error
 	String() string
 }
 
-type Reader interface {
-	ReadHeader(*Message, MessageType) error
-	ReadBody(interface{}) error
-}
-
-type Writer interface {
-	Write(*Message, interface{}) error
-}
-
-// Marshaler is a simple encoding interface used for the broker/transport
-// where headers are not supported by the underlying implementation.
-type Marshaler interface {
-	Marshal(interface{}) ([]byte, error)
-	Unmarshal([]byte, interface{}) error
+type CodecV2 interface {
+	Marshal(buf []byte, v interface{}, opts ...Option) ([]byte, error)
+	Unmarshal(buf []byte, v interface{}, opts ...Option) error
 	String() string
 }
 
-// Message represents detailed information about
-// the communication, likely followed by the body.
-// In the case of an error, body may be nil.
-type Message struct {
-	Id       string
-	Type     MessageType
-	Target   string
-	Method   string
-	Endpoint string
-	Error    string
+// RawMessage is a raw encoded JSON value.
+// It implements Marshaler and Unmarshaler and can be used to delay decoding or precompute a encoding.
+type RawMessage []byte
 
-	// The values read from the socket
-	Header map[string]string
-	Body   []byte
+// MarshalJSON returns m as the JSON encoding of m.
+func (m *RawMessage) MarshalJSON() ([]byte, error) {
+	if m == nil {
+		return []byte("null"), nil
+	} else if len(*m) == 0 {
+		return []byte("null"), nil
+	}
+	return *m, nil
+}
+
+// UnmarshalJSON sets *m to a copy of data.
+func (m *RawMessage) UnmarshalJSON(data []byte) error {
+	if m == nil {
+		return errors.New("RawMessage UnmarshalJSON on nil pointer")
+	}
+	*m = append((*m)[0:0], data...)
+	return nil
+}
+
+// MarshalYAML returns m as the JSON encoding of m.
+func (m *RawMessage) MarshalYAML() ([]byte, error) {
+	if m == nil {
+		return []byte("null"), nil
+	} else if len(*m) == 0 {
+		return []byte("null"), nil
+	}
+	return *m, nil
+}
+
+// UnmarshalYAML sets *m to a copy of data.
+func (m *RawMessage) UnmarshalYAML(data []byte) error {
+	if m == nil {
+		return errors.New("RawMessage UnmarshalYAML on nil pointer")
+	}
+	*m = append((*m)[0:0], data...)
+	return nil
 }

codec/context.go

@@ -0,0 +1,43 @@
+package codec
+
+import (
+	"context"
+)
+
+type codecKey struct{}
+
+// FromContext returns codec from context
+func FromContext(ctx context.Context) (Codec, bool) {
+	if ctx == nil {
+		return nil, false
+	}
+	c, ok := ctx.Value(codecKey{}).(Codec)
+	return c, ok
+}
+
+// MustContext returns codec from context
+func MustContext(ctx context.Context) Codec {
+	c, ok := FromContext(ctx)
+	if !ok {
+		panic("missing codec")
+	}
+	return c
+}
+
+// NewContext put codec in context
+func NewContext(ctx context.Context, c Codec) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	return context.WithValue(ctx, codecKey{}, c)
+}
+
+// SetOption returns a function to setup a context with given value
+func SetOption(k, v interface{}) Option {
+	return func(o *Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}

codec/context_test.go

@@ -0,0 +1,35 @@
+package codec
+
+import (
+	"context"
+	"testing"
+)
+
+func TestFromContext(t *testing.T) {
+	ctx := context.WithValue(context.TODO(), codecKey{}, NewCodec())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("FromContext not works")
+	}
+}
+
+func TestNewContext(t *testing.T) {
+	ctx := NewContext(context.TODO(), NewCodec())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}
+
+func TestSetOption(t *testing.T) {
+	type key struct{}
+	o := SetOption(key{}, "test")
+	opts := &Options{}
+	o(opts)
+
+	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
+		t.Fatal("SetOption not works")
+	}
+}

codec/frame.go

@@ -0,0 +1,56 @@
+package codec
+
+// Frame gives us the ability to define raw data to send over the pipes
+type Frame struct {
+	Data []byte
+}
+
+// NewFrame returns new frame with data
+func NewFrame(data []byte) *Frame {
+	return &Frame{Data: data}
+}
+
+// MarshalJSON returns frame data
+func (m *Frame) MarshalJSON() ([]byte, error) {
+	return m.Marshal()
+}
+
+// UnmarshalJSON set frame data
+func (m *Frame) UnmarshalJSON(data []byte) error {
+	return m.Unmarshal(data)
+}
+
+// MarshalYAML returns frame data
+func (m *Frame) MarshalYAML() ([]byte, error) {
+	return m.Marshal()
+}
+
+// UnmarshalYAML set frame data
+func (m *Frame) UnmarshalYAML(data []byte) error {
+	m.Data = append((m.Data)[0:0], data...)
+	return nil
+}
+
+// ProtoMessage noop func
+func (m *Frame) ProtoMessage() {}
+
+// Reset resets frame
+func (m *Frame) Reset() {
+	*m = Frame{}
+}
+
+// String returns frame as string
+func (m *Frame) String() string {
+	return string(m.Data)
+}
+
+// Marshal returns frame data
+func (m *Frame) Marshal() ([]byte, error) {
+	return m.Data, nil
+}
+
+// Unmarshal set frame data
+func (m *Frame) Unmarshal(data []byte) error {
+	m.Data = data
+	return nil
+}

codec/frame.proto

@@ -0,0 +1,28 @@
+// Copyright 2021 Unistack LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package micro.codec;
+
+option cc_enable_arenas = true;
+option go_package = "go.unistack.org/micro/v4/codec;codec";
+option java_multiple_files = true;
+option java_outer_classname = "MicroCodec";
+option java_package = "micro.codec";
+option objc_class_prefix = "MCODEC";
+
+message Frame {
+  bytes data = 1;
+}

codec/grpc/grpc.go

@@ -1,132 +0,0 @@
-// Package grpc provides a grpc codec
-package grpc
-
-import (
-	"encoding/json"
-	"errors"
-	"fmt"
-	"io"
-	"strings"
-
-	"github.com/golang/protobuf/proto"
-	"github.com/micro/go-micro/codec"
-)
-
-type Codec struct {
-	Conn        io.ReadWriteCloser
-	ContentType string
-}
-
-func (c *Codec) ReadHeader(m *codec.Message, t codec.MessageType) error {
-	if ct := m.Header["Content-Type"]; len(ct) > 0 {
-		c.ContentType = ct
-	}
-
-	if ct := m.Header["content-type"]; len(ct) > 0 {
-		c.ContentType = ct
-	}
-
-	// service method
-	path := m.Header[":path"]
-	if len(path) == 0 || path[0] != '/' {
-		m.Target = m.Header["Micro-Service"]
-		m.Endpoint = m.Header["Micro-Endpoint"]
-	} else {
-		// [ , a.package.Foo, Bar]
-		parts := strings.Split(path, "/")
-		if len(parts) != 3 {
-			return errors.New("Unknown request path")
-		}
-		service := strings.Split(parts[1], ".")
-		m.Endpoint = strings.Join([]string{service[len(service)-1], parts[2]}, ".")
-		m.Target = strings.Join(service[:len(service)-1], ".")
-	}
-
-	return nil
-}
-
-func (c *Codec) ReadBody(b interface{}) error {
-	// no body
-	if b == nil {
-		return nil
-	}
-
-	_, buf, err := decode(c.Conn)
-	if err != nil {
-		return err
-	}
-
-	switch c.ContentType {
-	case "application/grpc+json":
-		return json.Unmarshal(buf, b)
-	case "application/grpc+proto", "application/grpc":
-		return proto.Unmarshal(buf, b.(proto.Message))
-	}
-
-	return errors.New("Unsupported Content-Type")
-}
-
-func (c *Codec) Write(m *codec.Message, b interface{}) error {
-	var buf []byte
-	var err error
-
-	if ct := m.Header["Content-Type"]; len(ct) > 0 {
-		c.ContentType = ct
-	}
-
-	if ct := m.Header["content-type"]; len(ct) > 0 {
-		c.ContentType = ct
-	}
-
-	switch m.Type {
-	case codec.Request:
-		parts := strings.Split(m.Endpoint, ".")
-		m.Header[":method"] = "POST"
-		m.Header[":path"] = fmt.Sprintf("/%s.%s/%s", m.Target, parts[0], parts[1])
-		m.Header[":proto"] = "HTTP/2.0"
-		m.Header["te"] = "trailers"
-		m.Header["user-agent"] = "grpc-go/1.0.0"
-		m.Header[":authority"] = m.Target
-		m.Header["content-type"] = c.ContentType
-	case codec.Response:
-		m.Header["Trailer"] = "grpc-status, grpc-message"
-		m.Header["grpc-status"] = "0"
-		m.Header["grpc-message"] = ""
-	}
-
-	// marshal content
-	switch c.ContentType {
-	case "application/grpc+json":
-		buf, err = json.Marshal(b)
-	case "application/grpc+proto", "application/grpc":
-		pb, ok := b.(proto.Message)
-		if ok {
-			buf, err = proto.Marshal(pb)
-		}
-	default:
-		err = errors.New("Unsupported Content-Type")
-	}
-	// check error
-	if err != nil {
-		m.Header["grpc-status"] = "8"
-		m.Header["grpc-message"] = err.Error()
-		return err
-	}
-
-	return encode(0, buf, c.Conn)
-}
-
-func (c *Codec) Close() error {
-	return c.Conn.Close()
-}
-
-func (c *Codec) String() string {
-	return "grpc"
-}
-
-func NewCodec(c io.ReadWriteCloser) codec.Codec {
-	return &Codec{
-		Conn:        c,
-		ContentType: "application/grpc",
-	}
-}

codec/grpc/util.go

@@ -1,70 +0,0 @@
-package grpc
-
-import (
-	"encoding/binary"
-	"fmt"
-	"io"
-)
-
-var (
-	maxMessageSize = 1024 * 1024 * 4
-	maxInt         = int(^uint(0) >> 1)
-)
-
-func decode(r io.Reader) (uint8, []byte, error) {
-	header := make([]byte, 5)
-
-	// read the header
-	if _, err := r.Read(header[:]); err != nil {
-		return uint8(0), nil, err
-	}
-
-	// get encoding format e.g compressed
-	cf := uint8(header[0])
-
-	// get message length
-	length := binary.BigEndian.Uint32(header[1:])
-
-	// no encoding format
-	if length == 0 {
-		return cf, nil, nil
-	}
-
-	//
-	if int64(length) > int64(maxInt) {
-		return cf, nil, fmt.Errorf("grpc: received message larger than max length allowed on current machine (%d vs. %d)", length, maxInt)
-	}
-	if int(length) > maxMessageSize {
-		return cf, nil, fmt.Errorf("grpc: received message larger than max (%d vs. %d)", length, maxMessageSize)
-	}
-
-	msg := make([]byte, int(length))
-
-	if _, err := r.Read(msg); err != nil {
-		if err == io.EOF {
-			err = io.ErrUnexpectedEOF
-		}
-		return cf, nil, err
-	}
-
-	return cf, msg, nil
-}
-
-func encode(cf uint8, buf []byte, w io.Writer) error {
-	header := make([]byte, 5)
-
-	// set compression
-	header[0] = byte(cf)
-
-	// write length as header
-	binary.BigEndian.PutUint32(header[1:], uint32(len(buf)))
-
-	// read the header
-	if _, err := w.Write(header[:]); err != nil {
-		return err
-	}
-
-	// write the buffer
-	_, err := w.Write(buf)
-	return err
-}

codec/json/json.go

@@ -1,49 +0,0 @@
-// Package json provides a json codec
-package json
-
-import (
-	"encoding/json"
-	"io"
-
-	"github.com/micro/go-micro/codec"
-)
-
-type Codec struct {
-	Conn    io.ReadWriteCloser
-	Encoder *json.Encoder
-	Decoder *json.Decoder
-}
-
-func (c *Codec) ReadHeader(m *codec.Message, t codec.MessageType) error {
-	return nil
-}
-
-func (c *Codec) ReadBody(b interface{}) error {
-	if b == nil {
-		return nil
-	}
-	return c.Decoder.Decode(b)
-}
-
-func (c *Codec) Write(m *codec.Message, b interface{}) error {
-	if b == nil {
-		return nil
-	}
-	return c.Encoder.Encode(b)
-}
-
-func (c *Codec) Close() error {
-	return c.Conn.Close()
-}
-
-func (c *Codec) String() string {
-	return "json"
-}
-
-func NewCodec(c io.ReadWriteCloser) codec.Codec {
-	return &Codec{
-		Conn:    c,
-		Decoder: json.NewDecoder(c),
-		Encoder: json.NewEncoder(c),
-	}
-}

codec/json/marshaler.go

@@ -1,19 +0,0 @@
-package json
-
-import (
-	"encoding/json"
-)
-
-type Marshaler struct{}
-
-func (j Marshaler) Marshal(v interface{}) ([]byte, error) {
-	return json.Marshal(v)
-}
-
-func (j Marshaler) Unmarshal(d []byte, v interface{}) error {
-	return json.Unmarshal(d, v)
-}
-
-func (j Marshaler) String() string {
-	return "json"
-}

codec/jsonrpc/client.go

@@ -1,97 +0,0 @@
-package jsonrpc
-
-import (
-	"encoding/json"
-	"fmt"
-	"io"
-	"sync"
-
-	"github.com/micro/go-micro/codec"
-)
-
-type clientCodec struct {
-	dec *json.Decoder // for reading JSON values
-	enc *json.Encoder // for writing JSON values
-	c   io.Closer
-
-	// temporary work space
-	req  clientRequest
-	resp clientResponse
-
-	sync.Mutex
-	pending map[interface{}]string
-}
-
-type clientRequest struct {
-	Method string         `json:"method"`
-	Params [1]interface{} `json:"params"`
-	ID     interface{}    `json:"id"`
-}
-
-type clientResponse struct {
-	ID     interface{}      `json:"id"`
-	Result *json.RawMessage `json:"result"`
-	Error  interface{}      `json:"error"`
-}
-
-func newClientCodec(conn io.ReadWriteCloser) *clientCodec {
-	return &clientCodec{
-		dec:     json.NewDecoder(conn),
-		enc:     json.NewEncoder(conn),
-		c:       conn,
-		pending: make(map[interface{}]string),
-	}
-}
-
-func (c *clientCodec) Write(m *codec.Message, b interface{}) error {
-	c.Lock()
-	c.pending[m.Id] = m.Method
-	c.Unlock()
-	c.req.Method = m.Method
-	c.req.Params[0] = b
-	c.req.ID = m.Id
-	return c.enc.Encode(&c.req)
-}
-
-func (r *clientResponse) reset() {
-	r.ID = 0
-	r.Result = nil
-	r.Error = nil
-}
-
-func (c *clientCodec) ReadHeader(m *codec.Message) error {
-	c.resp.reset()
-	if err := c.dec.Decode(&c.resp); err != nil {
-		return err
-	}
-
-	c.Lock()
-	m.Method = c.pending[c.resp.ID]
-	delete(c.pending, c.resp.ID)
-	c.Unlock()
-
-	m.Error = ""
-	m.Id = fmt.Sprintf("%v", c.resp.ID)
-	if c.resp.Error != nil {
-		x, ok := c.resp.Error.(string)
-		if !ok {
-			return fmt.Errorf("invalid error %v", c.resp.Error)
-		}
-		if x == "" {
-			x = "unspecified error"
-		}
-		m.Error = x
-	}
-	return nil
-}
-
-func (c *clientCodec) ReadBody(x interface{}) error {
-	if x == nil || c.resp.Result == nil {
-		return nil
-	}
-	return json.Unmarshal(*c.resp.Result, x)
-}
-
-func (c *clientCodec) Close() error {
-	return c.c.Close()
-}

codec/jsonrpc/jsonrpc.go

@@ -1,89 +0,0 @@
-// Package jsonrpc provides a json-rpc 1.0 codec
-package jsonrpc
-
-import (
-	"bytes"
-	"encoding/json"
-	"fmt"
-	"io"
-
-	"github.com/micro/go-micro/codec"
-)
-
-type jsonCodec struct {
-	buf *bytes.Buffer
-	mt  codec.MessageType
-	rwc io.ReadWriteCloser
-	c   *clientCodec
-	s   *serverCodec
-}
-
-func (j *jsonCodec) Close() error {
-	j.buf.Reset()
-	return j.rwc.Close()
-}
-
-func (j *jsonCodec) String() string {
-	return "json-rpc"
-}
-
-func (j *jsonCodec) Write(m *codec.Message, b interface{}) error {
-	switch m.Type {
-	case codec.Request:
-		return j.c.Write(m, b)
-	case codec.Response, codec.Error:
-		return j.s.Write(m, b)
-	case codec.Publication:
-		data, err := json.Marshal(b)
-		if err != nil {
-			return err
-		}
-		_, err = j.rwc.Write(data)
-		return err
-	default:
-		return fmt.Errorf("Unrecognised message type: %v", m.Type)
-	}
-}
-
-func (j *jsonCodec) ReadHeader(m *codec.Message, mt codec.MessageType) error {
-	j.buf.Reset()
-	j.mt = mt
-
-	switch mt {
-	case codec.Request:
-		return j.s.ReadHeader(m)
-	case codec.Response:
-		return j.c.ReadHeader(m)
-	case codec.Publication:
-		_, err := io.Copy(j.buf, j.rwc)
-		return err
-	default:
-		return fmt.Errorf("Unrecognised message type: %v", mt)
-	}
-	return nil
-}
-
-func (j *jsonCodec) ReadBody(b interface{}) error {
-	switch j.mt {
-	case codec.Request:
-		return j.s.ReadBody(b)
-	case codec.Response:
-		return j.c.ReadBody(b)
-	case codec.Publication:
-		if b != nil {
-			return json.Unmarshal(j.buf.Bytes(), b)
-		}
-	default:
-		return fmt.Errorf("Unrecognised message type: %v", j.mt)
-	}
-	return nil
-}
-
-func NewCodec(rwc io.ReadWriteCloser) codec.Codec {
-	return &jsonCodec{
-		buf: bytes.NewBuffer(nil),
-		rwc: rwc,
-		c:   newClientCodec(rwc),
-		s:   newServerCodec(rwc),
-	}
-}

codec/jsonrpc/server.go

@@ -1,87 +0,0 @@
-package jsonrpc
-
-import (
-	"encoding/json"
-	"fmt"
-	"io"
-
-	"github.com/micro/go-micro/codec"
-)
-
-type serverCodec struct {
-	dec *json.Decoder // for reading JSON values
-	enc *json.Encoder // for writing JSON values
-	c   io.Closer
-
-	// temporary work space
-	req  serverRequest
-	resp serverResponse
-}
-
-type serverRequest struct {
-	Method string           `json:"method"`
-	Params *json.RawMessage `json:"params"`
-	ID     interface{}      `json:"id"`
-}
-
-type serverResponse struct {
-	ID     interface{} `json:"id"`
-	Result interface{} `json:"result"`
-	Error  interface{} `json:"error"`
-}
-
-func newServerCodec(conn io.ReadWriteCloser) *serverCodec {
-	return &serverCodec{
-		dec: json.NewDecoder(conn),
-		enc: json.NewEncoder(conn),
-		c:   conn,
-	}
-}
-
-func (r *serverRequest) reset() {
-	r.Method = ""
-	if r.Params != nil {
-		*r.Params = (*r.Params)[0:0]
-	}
-	if r.ID != nil {
-		r.ID = nil
-	}
-}
-
-func (c *serverCodec) ReadHeader(m *codec.Message) error {
-	c.req.reset()
-	if err := c.dec.Decode(&c.req); err != nil {
-		return err
-	}
-	m.Method = c.req.Method
-	m.Id = fmt.Sprintf("%v", c.req.ID)
-	c.req.ID = nil
-	return nil
-}
-
-func (c *serverCodec) ReadBody(x interface{}) error {
-	if x == nil {
-		return nil
-	}
-	var params [1]interface{}
-	params[0] = x
-	return json.Unmarshal(*c.req.Params, &params)
-}
-
-var null = json.RawMessage([]byte("null"))
-
-func (c *serverCodec) Write(m *codec.Message, x interface{}) error {
-	var resp serverResponse
-	resp.ID = m.Id
-	resp.Result = x
-	if m.Error == "" {
-		resp.Error = nil
-	} else {
-		resp.Error = m.Error
-	}
-	return c.enc.Encode(resp)
-}
-
-func (c *serverCodec) Close() error {
-	return c.c.Close()
-}

codec/noop.go

@@ -0,0 +1,68 @@
+package codec
+
+import (
+	"encoding/json"
+
+	codecpb "go.unistack.org/micro-proto/v4/codec"
+)
+
+type noopCodec struct {
+	opts Options
+}
+
+func (c *noopCodec) String() string {
+	return "noop"
+}
+
+// NewCodec returns new noop codec
+func NewCodec(opts ...Option) Codec {
+	return &noopCodec{opts: NewOptions(opts...)}
+}
+
+func (c *noopCodec) Marshal(v interface{}, opts ...Option) ([]byte, error) {
+	if v == nil {
+		return nil, nil
+	}
+
+	switch ve := v.(type) {
+	case string:
+		return []byte(ve), nil
+	case *string:
+		return []byte(*ve), nil
+	case *[]byte:
+		return *ve, nil
+	case []byte:
+		return ve, nil
+	case *Frame:
+		return ve.Data, nil
+	case *codecpb.Frame:
+		return ve.Data, nil
+	}
+
+	return json.Marshal(v)
+}
+
+func (c *noopCodec) Unmarshal(d []byte, v interface{}, opts ...Option) error {
+	if v == nil {
+		return nil
+	}
+	switch ve := v.(type) {
+	case *string:
+		*ve = string(d)
+		return nil
+	case []byte:
+		copy(ve, d)
+		return nil
+	case *[]byte:
+		*ve = d
+		return nil
+	case *Frame:
+		ve.Data = d
+		return nil
+	case *codecpb.Frame:
+		ve.Data = d
+		return nil
+	}
+
+	return json.Unmarshal(d, v)
+}

codec/noop_test.go

@@ -0,0 +1,48 @@
+package codec
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestNoopBytesPtr(t *testing.T) {
+	req := []byte("test req")
+	rsp := make([]byte, len(req))
+
+	nc := NewCodec()
+	if err := nc.Unmarshal(req, &rsp); err != nil {
+		t.Fatal(err)
+	}
+
+	if !bytes.Equal(req, rsp) {
+		t.Fatalf("req not eq rsp: %s != %s", req, rsp)
+	}
+}
+
+func TestNoopBytes(t *testing.T) {
+	req := []byte("test req")
+	var rsp []byte
+
+	nc := NewCodec()
+	if err := nc.Unmarshal(req, &rsp); err != nil {
+		t.Fatal(err)
+	}
+
+	if !bytes.Equal(req, rsp) {
+		t.Fatalf("req not eq rsp: %s != %s", req, rsp)
+	}
+}
+
+func TestNoopString(t *testing.T) {
+	req := []byte("test req")
+	var rsp string
+
+	nc := NewCodec()
+	if err := nc.Unmarshal(req, &rsp); err != nil {
+		t.Fatal(err)
+	}
+
+	if !bytes.Equal(req, []byte(rsp)) {
+		t.Fatalf("req not eq rsp: %s != %s", req, rsp)
+	}
+}

codec/options.go

@@ -0,0 +1,81 @@
+package codec
+
+import (
+	"context"
+
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/meter"
+	"go.unistack.org/micro/v4/tracer"
+)
+
+// Option func
+type Option func(*Options)
+
+// Options contains codec options
+type Options struct {
+	// Meter used for metrics
+	Meter meter.Meter
+	// Logger used for logging
+	Logger logger.Logger
+	// Tracer used for tracing
+	Tracer tracer.Tracer
+	// Context stores additional codec options
+	Context context.Context
+	// TagName specifies tag name in struct to control codec
+	TagName string
+	// Flatten specifies that struct must be analyzed for flatten tag
+	Flatten bool
+}
+
+// TagName sets the codec tag name in struct
+func TagName(n string) Option {
+	return func(o *Options) {
+		o.TagName = n
+	}
+}
+
+// Flatten enables checking for flatten tag name
+func Flatten(b bool) Option {
+	return func(o *Options) {
+		o.Flatten = b
+	}
+}
+
+// Logger sets the logger
+func Logger(l logger.Logger) Option {
+	return func(o *Options) {
+		o.Logger = l
+	}
+}
+
+// Tracer to be used for tracing
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}
+
+// Meter sets the meter
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
+// NewOptions returns new options
+func NewOptions(opts ...Option) Options {
+	options := Options{
+		Context: context.Background(),
+		Logger:  logger.DefaultLogger,
+		Meter:   meter.DefaultMeter,
+		Tracer:  tracer.DefaultTracer,
+		TagName: DefaultTagName,
+		Flatten: false,
+	}
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	return options
+}

codec/proto/marshaler.go

@@ -1,19 +0,0 @@
-package proto
-
-import (
-	"github.com/golang/protobuf/proto"
-)
-
-type Marshaler struct{}
-
-func (Marshaler) Marshal(v interface{}) ([]byte, error) {
-	return proto.Marshal(v.(proto.Message))
-}
-
-func (Marshaler) Unmarshal(data []byte, v interface{}) error {
-	return proto.Unmarshal(data, v.(proto.Message))
-}
-
-func (Marshaler) Name() string {
-	return "proto"
-}

codec/proto/proto.go

@@ -1,56 +0,0 @@
-// Package proto provides a proto codec
-package proto
-
-import (
-	"io"
-	"io/ioutil"
-
-	"github.com/golang/protobuf/proto"
-	"github.com/micro/go-micro/codec"
-)
-
-type Codec struct {
-	Conn io.ReadWriteCloser
-}
-
-func (c *Codec) ReadHeader(m *codec.Message, t codec.MessageType) error {
-	return nil
-}
-
-func (c *Codec) ReadBody(b interface{}) error {
-	if b == nil {
-		return nil
-	}
-	buf, err := ioutil.ReadAll(c.Conn)
-	if err != nil {
-		return err
-	}
-	return proto.Unmarshal(buf, b.(proto.Message))
-}
-
-func (c *Codec) Write(m *codec.Message, b interface{}) error {
-	p, ok := b.(proto.Message)
-	if !ok {
-		return nil
-	}
-	buf, err := proto.Marshal(p)
-	if err != nil {
-		return err
-	}
-	_, err = c.Conn.Write(buf)
-	return err
-}
-
-func (c *Codec) Close() error {
-	return c.Conn.Close()
-}
-
-func (c *Codec) String() string {
-	return "proto"
-}
-
-func NewCodec(c io.ReadWriteCloser) codec.Codec {
-	return &Codec{
-		Conn: c,
-	}
-}