.gitea/ISSUE_TEMPLATE/bug_report.md

@@ -1,18 +0,0 @@
----
-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.

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

@@ -1,17 +0,0 @@
----
-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.

.gitea/ISSUE_TEMPLATE/question.md

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

.gitea/autoapprove.yml

@@ -1,28 +0,0 @@
-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 }}

.gitea/pkgdashcli.yaml

@@ -1,3 +0,0 @@
-branches:
-  - master
-  - v3

.gitea/workflows/autoupdate.yml

@@ -1,24 +0,0 @@
-on:
-  push:
-    branches:
-    - 'main'
-    - 'master'
-    - 'v3'
-  schedule:
-    #- cron: '* * * * *'
-    - cron: '@hourly'
-
-jobs:
-  autoupdate:
-    runs-on: ubuntu-latest
-    steps:
-    - name: setup-go
-      uses: https://gitea.com/actions/setup-go@v3
-      with:
-        go-version: 1.21
-    - name: checkout
-      uses: https://gitea.com/actions/checkout@v3
-    - name: get pkgdashcli
-      run: GOPROXY=direct GONOSUMDB="git.unistack.org/*" GONOPROXY="git.unistack.org/*" GOBIN=/bin go install git.unistack.org/unistack-org/pkgdash/cmd/pkgdashcli@latest
-    - name: pkgdashcli check
-      run: /bin/pkgdashcli check

.gitea/workflows/coverage.yml

@@ -1,30 +0,0 @@
-name: Go
-
-on:
-  push:
-    branches: [ master, v3 ]
-  pull_request:
-    branches: [ master, v3 ]
-  workflow_dispatch:
-
-jobs:
-  test:
-    runs-on: ubuntu-latest
-    steps:
-    - name: checkout
-      uses: actions/checkout@v4
-
-    - name: setup
-      uses: actions/setup-go@v4
-      with:
-        go-version: stable
-
-    - name: coverage
-      run: go test -v -coverprofile coverage.out ./...
-
-    - name: badge
-      uses: ncruces/go-coverage-report@main
-      with:
-        coverage-file: coverage.out
-        reuse-go: true
-        amend: true

.gitea/workflows/lint.yml

@@ -1,24 +0,0 @@
-name: lint
-on:
-  pull_request:
-    branches:
-    - master
-    - v3
-jobs:
-  lint:
-    name: lint
-    runs-on: ubuntu-latest
-    steps:
-    - name: setup-go
-      uses: https://gitea.com/actions/setup-go@v3
-      with:
-        go-version: 1.21
-    - name: checkout
-      uses: https://gitea.com/actions/checkout@v3
-    - name: deps
-      run: go get -v -d ./...
-    - name: lint
-      uses: https://github.com/golangci/golangci-lint-action@v3.4.0
-      continue-on-error: true
-      with:
-        version: v1.52

.gitea/workflows/pr.yml

@@ -1,23 +0,0 @@
-name: pr
-on:
-  pull_request:
-    branches:
-    - master
-    - v3
-jobs:
-  test:
-    name: test
-    runs-on: ubuntu-latest
-    steps:
-    - name: checkout
-      uses: https://gitea.com/actions/checkout@v3
-    - name: setup-go
-      uses: https://gitea.com/actions/setup-go@v3
-      with:
-        go-version: 1.21
-    - name: deps
-      run: go get -v -t -d ./...
-    - name: test
-      env:
-        INTEGRATION_TESTS: yes
-      run: go test -v -mod readonly -race -coverprofile=coverage.txt -covermode=atomic ./...

.github.old/PULL_REQUEST_TEMPLATE.md

@@ -1,9 +0,0 @@
-## 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/workflows/autoapprove.yml

@@ -1,24 +0,0 @@
-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

@@ -1,21 +0,0 @@
-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/codecov.yml

@@ -1,39 +0,0 @@
-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

@@ -1,78 +0,0 @@
-# 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

@@ -1,27 +0,0 @@
-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

@@ -1,40 +0,0 @@
-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/dependabot.yml

@@ -11,16 +11,9 @@ updates:
     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/workflows/build.yml

@@ -3,42 +3,57 @@ on:
   push:
     branches:
     - master
-    - v3
 jobs:
   test:
     name: test
     runs-on: ubuntu-latest
     steps:
     - name: setup
-      uses: actions/setup-go@v3
+      uses: actions/setup-go@v2
       with:
-        go-version: 1.17
+        go-version: 1.16
-    - name: checkout
-      uses: actions/checkout@v3
     - name: cache
-      uses: actions/cache@v3
+      uses: actions/cache@v2
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
         restore-keys: ${{ runner.os }}-go-
-    - name: deps
+    - name: sdk checkout
+      uses: actions/checkout@v2
+    - name: sdk deps
       run: go get -v -t -d ./...
-    - name: test
+    - name: sdk test
       env:
         INTEGRATION_TESTS: yes
       run: go test -mod readonly -v ./...
+    - name: tests checkout
+      uses: actions/checkout@v2
+      with:
+        repository: unistack-org/micro-tests
+        ref: refs/heads/master
+        path: micro-tests
+        fetch-depth: 1
+    - name: tests deps
+      run: |
+        cd micro-tests
+        go mod edit -replace="github.com/unistack-org/micro/v3=../"
+        go get -v -t -d ./...
+    - name: tests test
+      env:
+        INTEGRATION_TESTS: yes
+      run: cd micro-tests && go test -mod readonly -v ./...
   lint:
     name: lint
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v2
       - name: lint
-        uses: golangci/golangci-lint-action@v3.4.0
+        uses: golangci/golangci-lint-action@v2
         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
+          version: v1.39
           # Optional: working directory, useful for monorepos
           # working-directory: somedir
           # Optional: golangci-lint command line arguments.

.github/workflows/pr.yml

@@ -0,0 +1,62 @@
+name: prbuild
+on:
+  pull_request:
+    branches:
+    - master
+jobs:
+  test:
+    name: test
+    runs-on: ubuntu-latest
+    steps:
+    - name: setup
+      uses: actions/setup-go@v2
+      with:
+        go-version: 1.16
+    - name: cache
+      uses: actions/cache@v2
+      with:
+        path: ~/go/pkg
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: ${{ runner.os }}-go-
+    - name: sdk checkout
+      uses: actions/checkout@v2
+    - name: sdk deps
+      run: go get -v -t -d ./...
+    - name: sdk test
+      env:
+        INTEGRATION_TESTS: yes
+      run: go test -mod readonly -v ./...
+    - name: tests checkout
+      uses: actions/checkout@v2
+      with:
+        repository: unistack-org/micro-tests
+        ref: refs/heads/master
+        path: micro-tests
+        fetch-depth: 1
+    - name: tests deps
+      run: |
+        cd micro-tests
+        go mod edit -replace="github.com/unistack-org/micro/v3=../"
+        go get -v -t -d ./...
+    - name: tests test
+      env:
+        INTEGRATION_TESTS: yes
+      run: cd micro-tests && go test -mod readonly -v ./...
+  lint:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+      - name: lint
+        uses: golangci/golangci-lint-action@v2
+        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: v1.39
+          # 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

.gitignore

@@ -1,8 +1,6 @@
 # Develop tools
 /.vscode/
 /.idea/
-.idea
-.vscode
 
 # Binaries for programs and plugins
 *.exe
@@ -15,7 +13,6 @@
 _obj
 _test
 _build
-.DS_Store
 
 # Architecture specific extensions/prefixes
 *.[568vq]

.golangci.yml

@@ -1,5 +1,6 @@
 run:
   concurrency: 4
+  deadline: 5m
   issues-exit-code: 1
   tests: true
 
@@ -12,13 +13,15 @@ linters-settings:
 linters:
   enable:
     - govet
+    - deadcode
     - errcheck
     - govet
     - ineffassign
     - staticcheck
+    - structcheck
     - typecheck
     - unused
-    - spancheck
+    - varcheck
     - bodyclose
     - gci
     - goconst
@@ -27,7 +30,7 @@ linters:
     - gofmt
     - gofumpt
     - goimports
-    - revive
+    - golint
     - gosec
     - makezero
     - misspell
@@ -38,5 +41,4 @@ linters:
     - prealloc
     - unconvert
     - unparam
-    - unused
   disable-all: false

README.md

@@ -1,4 +1,4 @@
-# Micro [![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://github.com/unistack-org/micro/workflows/build/badge.svg?branch=master)](https://github.com/unistack-org/micro/actions?query=workflow%3Abuild+branch%3Amaster+event%3Apush) [![Lint](https://goreportcard.com/badge/go.unistack.org/micro/v4)](https://goreportcard.com/report/go.unistack.org/micro/v4) [![Coverage](https://codecov.io/gh/unistack-org/micro/branch/v4/graph/badge.svg?token=OZPO2LP7VS)](https://codecov.io/gh/unistack-org/micro)
+# Micro [![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/github.com/unistack-org/micro/v3?tab=overview) [![Status](https://github.com/unistack-org/micro/workflows/build/badge.svg?branch=master)](https://github.com/unistack-org/micro/actions?query=workflow%3Abuild+branch%3Amaster+event%3Apush) [![Lint](https://goreportcard.com/badge/github.com/unistack-org/micro)](https://goreportcard.com/report/github.com/unistack-org/micro) [![Slack](https://img.shields.io/static/v1?label=micro&message=slack&color=blueviolet)](https://unistack-org.slack.com/messages/default)
 
 Micro is a standard library for microservices.
 

SECURITY.md

@@ -1,15 +0,0 @@
-# Security Policy
-
-## Supported Versions
-
-Use this section to tell people about which versions of your project are
-currently being supported with security updates.
-
-| Version | Supported          |
-| ------- | ------------------ |
-| 3.7.x   | :white_check_mark: |
-| < 3.7.0 | :x:                |
-
-## Reporting a Vulnerability
-
-If you find any issue, please create github issue in this repo

api/api.go

@@ -0,0 +1,181 @@
+package api
+
+import (
+	"errors"
+	"regexp"
+	"strings"
+
+	"github.com/unistack-org/micro/v3/metadata"
+	"github.com/unistack-org/micro/v3/register"
+	"github.com/unistack-org/micro/v3/server"
+)
+
+// Api interface
+type Api interface {
+	// Initialise options
+	Init(...Option) error
+	// Get the options
+	Options() Options
+	// Register a http handler
+	Register(*Endpoint) error
+	// Register a route
+	Deregister(*Endpoint) error
+	// Implementation of api
+	String() string
+}
+
+// Options holds the options
+type Options struct{}
+
+// Option func signature
+type Option func(*Options) error
+
+// Endpoint is a mapping between an RPC method and HTTP endpoint
+type Endpoint struct {
+	// Name Greeter.Hello
+	Name string
+	// Desciption for endpoint
+	Description string
+	// Handler e.g rpc, proxy
+	Handler string
+	// Body destination
+	// "*" or "" - top level message value
+	// "string" - inner message value
+	Body string
+	// Host e.g example.com
+	Host []string
+	// Method e.g GET, POST
+	Method []string
+	// Path e.g /greeter. Expect POSIX regex
+	Path []string
+	// Stream flag
+	Stream bool
+}
+
+// Service represents an API service
+type Service struct {
+	// Name of service
+	Name string
+	// Endpoint for this service
+	Endpoint *Endpoint
+	// Services that provides service
+	Services []*register.Service
+}
+
+// Encode encodes an endpoint to endpoint metadata
+func Encode(e *Endpoint) map[string]string {
+	if e == nil {
+		return nil
+	}
+
+	// endpoint map
+	ep := make(map[string]string)
+
+	// set vals only if they exist
+	set := func(k, v string) {
+		if len(v) == 0 {
+			return
+		}
+		ep[k] = v
+	}
+
+	set("endpoint", e.Name)
+	set("description", e.Description)
+	set("handler", e.Handler)
+	set("method", strings.Join(e.Method, ","))
+	set("path", strings.Join(e.Path, ","))
+	set("host", strings.Join(e.Host, ","))
+	set("body", e.Body)
+
+	return ep
+}
+
+// Decode decodes endpoint metadata into an endpoint
+func Decode(e metadata.Metadata) *Endpoint {
+	if e == nil {
+		return nil
+	}
+
+	ep := &Endpoint{}
+	ep.Name, _ = e.Get("endpoint")
+	ep.Description, _ = e.Get("description")
+	epmethod, _ := e.Get("method")
+	ep.Method = []string{epmethod}
+	eppath, _ := e.Get("path")
+	ep.Path = []string{eppath}
+	ephost, _ := e.Get("host")
+	ep.Host = []string{ephost}
+	ep.Handler, _ = e.Get("handler")
+	ep.Body, _ = e.Get("body")
+
+	return ep
+}
+
+// Validate validates an endpoint to guarantee it won't blow up when being served
+func Validate(e *Endpoint) error {
+	if e == nil {
+		return errors.New("endpoint is nil")
+	}
+
+	if len(e.Name) == 0 {
+		return errors.New("name required")
+	}
+
+	for _, p := range e.Path {
+		ps := p[0]
+		pe := p[len(p)-1]
+
+		if ps == '^' && pe == '$' {
+			_, err := regexp.CompilePOSIX(p)
+			if err != nil {
+				return err
+			}
+		} else if ps == '^' && pe != '$' {
+			return errors.New("invalid path")
+		} else if ps != '^' && pe == '$' {
+			return errors.New("invalid path")
+		}
+	}
+
+	if len(e.Handler) == 0 {
+		return errors.New("invalid handler")
+	}
+
+	return nil
+}
+
+/*
+Design ideas
+
+// Gateway is an api gateway interface
+type Gateway interface {
+	// Register a http handler
+	Handle(pattern string, http.Handler)
+	// Register a route
+	RegisterRoute(r Route)
+	// Init initialises the command line.
+	// It also parses further options.
+	Init(...Option) error
+	// Run the gateway
+	Run() error
+}
+
+// NewGateway returns a new api gateway
+func NewGateway() Gateway {
+	return newGateway()
+}
+*/
+
+// WithEndpoint returns a server.HandlerOption with endpoint metadata set
+//
+// Usage:
+//
+// 	proto.RegisterHandler(service.Server(), new(Handler), api.WithEndpoint(
+//		&api.Endpoint{
+//			Name: "Greeter.Hello",
+//			Path: []string{"/greeter"},
+//		},
+//	))
+func WithEndpoint(e *Endpoint) server.HandlerOption {
+	return server.EndpointMetadata(e.Name, Encode(e))
+}

api/api_test.go

@@ -0,0 +1,152 @@
+package api
+
+import (
+	"strings"
+	"testing"
+)
+
+//nolint:gocyclo
+func TestEncoding(t *testing.T) {
+	testData := []*Endpoint{
+		nil,
+		{
+			Name:        "Foo.Bar",
+			Description: "A test endpoint",
+			Handler:     "meta",
+			Host:        []string{"foo.com"},
+			Method:      []string{"GET"},
+			Path:        []string{"/test"},
+		},
+	}
+
+	compare := func(expect, got []string) bool {
+		// no data to compare, return true
+		if len(expect) == 0 && len(got) == 0 {
+			return true
+		}
+		// no data expected but got some return false
+		if len(expect) == 0 && len(got) > 0 {
+			return false
+		}
+
+		// compare expected with what we got
+		for _, e := range expect {
+			var seen bool
+			for _, g := range got {
+				if e == g {
+					seen = true
+					break
+				}
+			}
+			if !seen {
+				return false
+			}
+		}
+
+		// we're done, return true
+		return true
+	}
+
+	for _, d := range testData {
+		// encode
+		e := Encode(d)
+		// decode
+		de := Decode(e)
+
+		// nil endpoint returns nil
+		if d == nil {
+			if e != nil {
+				t.Fatalf("expected nil got %v", e)
+			}
+			if de != nil {
+				t.Fatalf("expected nil got %v", de)
+			}
+
+			continue
+		}
+
+		// check encoded map
+		name := e["endpoint"]
+		desc := e["description"]
+		method := strings.Split(e["method"], ",")
+		path := strings.Split(e["path"], ",")
+		host := strings.Split(e["host"], ",")
+		handler := e["handler"]
+
+		if name != d.Name {
+			t.Fatalf("expected %v got %v", d.Name, name)
+		}
+		if desc != d.Description {
+			t.Fatalf("expected %v got %v", d.Description, desc)
+		}
+		if handler != d.Handler {
+			t.Fatalf("expected %v got %v", d.Handler, handler)
+		}
+		if ok := compare(d.Method, method); !ok {
+			t.Fatalf("expected %v got %v", d.Method, method)
+		}
+		if ok := compare(d.Path, path); !ok {
+			t.Fatalf("expected %v got %v", d.Path, path)
+		}
+		if ok := compare(d.Host, host); !ok {
+			t.Fatalf("expected %v got %v", d.Host, host)
+		}
+
+		if de.Name != d.Name {
+			t.Fatalf("expected %v got %v", d.Name, de.Name)
+		}
+		if de.Description != d.Description {
+			t.Fatalf("expected %v got %v", d.Description, de.Description)
+		}
+		if de.Handler != d.Handler {
+			t.Fatalf("expected %v got %v", d.Handler, de.Handler)
+		}
+		if ok := compare(d.Method, de.Method); !ok {
+			t.Fatalf("expected %v got %v", d.Method, de.Method)
+		}
+		if ok := compare(d.Path, de.Path); !ok {
+			t.Fatalf("expected %v got %v", d.Path, de.Path)
+		}
+		if ok := compare(d.Host, de.Host); !ok {
+			t.Fatalf("expected %v got %v", d.Host, de.Host)
+		}
+	}
+}
+
+func TestValidate(t *testing.T) {
+	epPcre := &Endpoint{
+		Name:        "Foo.Bar",
+		Description: "A test endpoint",
+		Handler:     "meta",
+		Host:        []string{"foo.com"},
+		Method:      []string{"GET"},
+		Path:        []string{"^/test/?$"},
+	}
+	if err := Validate(epPcre); err != nil {
+		t.Fatal(err)
+	}
+
+	epGpath := &Endpoint{
+		Name:        "Foo.Bar",
+		Description: "A test endpoint",
+		Handler:     "meta",
+		Host:        []string{"foo.com"},
+		Method:      []string{"GET"},
+		Path:        []string{"/test/{id}"},
+	}
+	if err := Validate(epGpath); err != nil {
+		t.Fatal(err)
+	}
+
+	epPcreInvalid := &Endpoint{
+		Name:        "Foo.Bar",
+		Description: "A test endpoint",
+		Handler:     "meta",
+		Host:        []string{"foo.com"},
+		Method:      []string{"GET"},
+		Path:        []string{"/test/?$"},
+	}
+	if err := Validate(epPcreInvalid); err == nil {
+		t.Fatalf("invalid pcre %v", epPcreInvalid.Path[0])
+	}
+}

api/handler/handler.go

@@ -0,0 +1,14 @@
+// Package handler provides http handlers
+package handler
+
+import (
+	"net/http"
+)
+
+// Handler represents a HTTP handler that manages a request
+type Handler interface {
+	// standard http handler
+	http.Handler
+	// name of handler
+	String() string
+}

api/handler/options.go

@@ -0,0 +1,70 @@
+package handler
+
+import (
+	"github.com/unistack-org/micro/v3/api/router"
+	"github.com/unistack-org/micro/v3/client"
+	"github.com/unistack-org/micro/v3/logger"
+)
+
+// DefaultMaxRecvSize specifies max recv size for handler
+var DefaultMaxRecvSize int64 = 1024 * 1024 * 100 // 10Mb
+
+// Options struct holds handler options
+type Options struct {
+	Router      router.Router
+	Client      client.Client
+	Logger      logger.Logger
+	Namespace   string
+	MaxRecvSize int64
+}
+
+// Option func signature
+type Option func(o *Options)
+
+// NewOptions creates new options struct and fills it
+func NewOptions(opts ...Option) Options {
+	options := Options{
+		Client:      client.DefaultClient,
+		Router:      router.DefaultRouter,
+		Logger:      logger.DefaultLogger,
+		MaxRecvSize: DefaultMaxRecvSize,
+	}
+	for _, o := range opts {
+		o(&options)
+	}
+
+	// set namespace if blank
+	if len(options.Namespace) == 0 {
+		WithNamespace("go.micro.api")(&options)
+	}
+
+	return options
+}
+
+// WithNamespace specifies the namespace for the handler
+func WithNamespace(s string) Option {
+	return func(o *Options) {
+		o.Namespace = s
+	}
+}
+
+// WithRouter specifies a router to be used by the handler
+func WithRouter(r router.Router) Option {
+	return func(o *Options) {
+		o.Router = r
+	}
+}
+
+// WithClient specifies client to be used by the handler
+func WithClient(c client.Client) Option {
+	return func(o *Options) {
+		o.Client = c
+	}
+}
+
+// WithMaxRecvSize specifies max body size
+func WithMaxRecvSize(size int64) Option {
+	return func(o *Options) {
+		o.MaxRecvSize = size
+	}
+}

api/resolver/grpc/grpc.go

@@ -0,0 +1,47 @@
+// Package grpc resolves a grpc service like /greeter.Say/Hello to greeter service
+package grpc
+
+import (
+	"errors"
+	"net/http"
+	"strings"
+
+	"github.com/unistack-org/micro/v3/api/resolver"
+)
+
+// Resolver struct
+type Resolver struct {
+	opts resolver.Options
+}
+
+// Resolve func to resolve enndpoint
+func (r *Resolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*resolver.Endpoint, error) {
+	// parse options
+	options := resolver.NewResolveOptions(opts...)
+
+	// /foo.Bar/Service
+	if req.URL.Path == "/" {
+		return nil, errors.New("unknown name")
+	}
+	// [foo.Bar, Service]
+	parts := strings.Split(req.URL.Path[1:], "/")
+	// [foo, Bar]
+	name := strings.Split(parts[0], ".")
+	// foo
+	return &resolver.Endpoint{
+		Name:   strings.Join(name[:len(name)-1], "."),
+		Host:   req.Host,
+		Method: req.Method,
+		Path:   req.URL.Path,
+		Domain: options.Domain,
+	}, nil
+}
+
+func (r *Resolver) String() string {
+	return "grpc"
+}
+
+// NewResolver is used to create new Resolver
+func NewResolver(opts ...resolver.Option) resolver.Resolver {
+	return &Resolver{opts: resolver.NewOptions(opts...)}
+}

api/resolver/host/host.go

@@ -0,0 +1,35 @@
+// Package host resolves using http host
+package host
+
+import (
+	"net/http"
+
+	"github.com/unistack-org/micro/v3/api/resolver"
+)
+
+type hostResolver struct {
+	opts resolver.Options
+}
+
+// Resolve endpoint
+func (r *hostResolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*resolver.Endpoint, error) {
+	// parse options
+	options := resolver.NewResolveOptions(opts...)
+
+	return &resolver.Endpoint{
+		Name:   req.Host,
+		Host:   req.Host,
+		Method: req.Method,
+		Path:   req.URL.Path,
+		Domain: options.Domain,
+	}, nil
+}
+
+func (r *hostResolver) String() string {
+	return "host"
+}
+
+// NewResolver creates new host api resolver
+func NewResolver(opts ...resolver.Option) resolver.Resolver {
+	return &hostResolver{opts: resolver.NewOptions(opts...)}
+}

api/resolver/options.go

@@ -0,0 +1,70 @@
+package resolver
+
+import (
+	"context"
+
+	"github.com/unistack-org/micro/v3/register"
+)
+
+// Options struct
+type Options struct {
+	// Context is for external defined options
+	Context context.Context
+	// Handler name
+	Handler string
+	// ServicePrefix is the prefix
+	ServicePrefix string
+}
+
+// Option func
+type Option func(o *Options)
+
+// WithHandler sets the handler being used
+func WithHandler(h string) Option {
+	return func(o *Options) {
+		o.Handler = h
+	}
+}
+
+// WithServicePrefix sets the ServicePrefix option
+func WithServicePrefix(p string) Option {
+	return func(o *Options) {
+		o.ServicePrefix = p
+	}
+}
+
+// NewOptions returns new initialised options
+func NewOptions(opts ...Option) Options {
+	options := Options{
+		Context: context.Background(),
+	}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}
+
+// ResolveOptions are used when resolving a request
+type ResolveOptions struct {
+	Domain string
+}
+
+// ResolveOption sets an option
+type ResolveOption func(*ResolveOptions)
+
+// Domain sets the resolve Domain option
+func Domain(n string) ResolveOption {
+	return func(o *ResolveOptions) {
+		o.Domain = n
+	}
+}
+
+// NewResolveOptions returns new initialised resolve options
+func NewResolveOptions(opts ...ResolveOption) ResolveOptions {
+	options := ResolveOptions{Domain: register.DefaultDomain}
+	for _, o := range opts {
+		o(&options)
+	}
+
+	return options
+}

api/resolver/path/path.go

@@ -0,0 +1,44 @@
+// Package path resolves using http path
+package path
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/unistack-org/micro/v3/api/resolver"
+)
+
+// Resolver the path resolver
+type Resolver struct {
+	opts resolver.Options
+}
+
+// Resolve resolves endpoint
+func (r *Resolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*resolver.Endpoint, error) {
+	// parse options
+	options := resolver.NewResolveOptions(opts...)
+
+	if req.URL.Path == "/" {
+		return nil, resolver.ErrNotFound
+	}
+
+	parts := strings.Split(req.URL.Path[1:], "/")
+
+	return &resolver.Endpoint{
+		Name:   r.opts.ServicePrefix + "." + parts[0],
+		Host:   req.Host,
+		Method: req.Method,
+		Path:   req.URL.Path,
+		Domain: options.Domain,
+	}, nil
+}
+
+// String retruns the string representation
+func (r *Resolver) String() string {
+	return "path"
+}
+
+// NewResolver returns new path resolver
+func NewResolver(opts ...resolver.Option) resolver.Resolver {
+	return &Resolver{opts: resolver.NewOptions(opts...)}
+}

api/resolver/resolver.go

@@ -0,0 +1,34 @@
+// Package resolver resolves a http request to an endpoint
+package resolver
+
+import (
+	"errors"
+	"net/http"
+)
+
+var (
+	// ErrNotFound returned when endpoint is not found
+	ErrNotFound = errors.New("not found")
+	// ErrInvalidPath returned on invalid path
+	ErrInvalidPath = errors.New("invalid path")
+)
+
+// Resolver resolves requests to endpoints
+type Resolver interface {
+	Resolve(r *http.Request, opts ...ResolveOption) (*Endpoint, error)
+	String() string
+}
+
+// Endpoint is the endpoint for a http request
+type Endpoint struct {
+	// Endpoint name e.g greeter
+	Name string
+	// HTTP Host e.g example.com
+	Host string
+	// HTTP Methods e.g GET, POST
+	Method string
+	// HTTP Path e.g /greeter.
+	Path string
+	// Domain endpoint exists within
+	Domain string
+}

api/resolver/subdomain/subdomain.go

@@ -0,0 +1,90 @@
+// Package subdomain is a resolver which uses the subdomain to determine the domain to route to. It
+// offloads the endpoint resolution to a child resolver which is provided in New.
+package subdomain
+
+import (
+	"net"
+	"net/http"
+	"strings"
+
+	"github.com/unistack-org/micro/v3/api/resolver"
+	"github.com/unistack-org/micro/v3/logger"
+	"golang.org/x/net/publicsuffix"
+)
+
+// NewResolver creates new subdomain api resolver
+func NewResolver(parent resolver.Resolver, opts ...resolver.Option) resolver.Resolver {
+	options := resolver.NewOptions(opts...)
+	return &subdomainResolver{opts: options, Resolver: parent}
+}
+
+type subdomainResolver struct {
+	resolver.Resolver
+	opts resolver.Options
+}
+
+// Resolve resolve endpoint based on subdomain
+func (r *subdomainResolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*resolver.Endpoint, error) {
+	if dom := r.Domain(req); len(dom) > 0 {
+		opts = append(opts, resolver.Domain(dom))
+	}
+
+	return r.Resolver.Resolve(req, opts...)
+}
+
+// Domain returns domain
+func (r *subdomainResolver) Domain(req *http.Request) string {
+	// determine the host, e.g. foobar.m3o.app
+	host := req.URL.Hostname()
+	if len(host) == 0 {
+		if h, _, err := net.SplitHostPort(req.Host); err == nil {
+			host = h // host does contain a port
+		} else if strings.Contains(err.Error(), "missing port in address") {
+			host = req.Host // host does not contain a port
+		}
+	}
+
+	// check for an ip address
+	if net.ParseIP(host) != nil {
+		return ""
+	}
+
+	// check for dev environment
+	if host == "localhost" || host == "127.0.0.1" {
+		return ""
+	}
+
+	// extract the top level domain plus one (e.g. 'myapp.com')
+	domain, err := publicsuffix.EffectiveTLDPlusOne(host)
+	if err != nil {
+		if logger.V(logger.DebugLevel) {
+			logger.Debug(r.opts.Context, "Unable to extract domain from %v", host)
+		}
+		return ""
+	}
+
+	// there was no subdomain
+	if host == domain {
+		return ""
+	}
+
+	// remove the domain from the host, leaving the subdomain, e.g. "staging.foo.myapp.com" => "staging.foo"
+	subdomain := strings.TrimSuffix(host, "."+domain)
+
+	// ignore the API subdomain
+	if subdomain == "api" {
+		return ""
+	}
+
+	// return the reversed subdomain as the namespace, e.g. "staging.foo" => "foo-staging"
+	comps := strings.Split(subdomain, ".")
+	for i := len(comps)/2 - 1; i >= 0; i-- {
+		opp := len(comps) - 1 - i
+		comps[i], comps[opp] = comps[opp], comps[i]
+	}
+	return strings.Join(comps, "-")
+}
+
+func (r *subdomainResolver) String() string {
+	return "subdomain"
+}

api/resolver/subdomain/subdomain_test.go

@@ -0,0 +1,73 @@
+package subdomain
+
+import (
+	"net/http"
+	"net/url"
+	"testing"
+
+	"github.com/unistack-org/micro/v3/api/resolver/vpath"
+)
+
+func TestResolve(t *testing.T) {
+	tt := []struct {
+		Name   string
+		Host   string
+		Result string
+	}{
+		{
+			Name:   "Top level domain",
+			Host:   "micro.mu",
+			Result: "micro",
+		},
+		{
+			Name:   "Effective top level domain",
+			Host:   "micro.com.au",
+			Result: "micro",
+		},
+		{
+			Name:   "Subdomain dev",
+			Host:   "dev.micro.mu",
+			Result: "dev",
+		},
+		{
+			Name:   "Subdomain foo",
+			Host:   "foo.micro.mu",
+			Result: "foo",
+		},
+		{
+			Name:   "Multi-level subdomain",
+			Host:   "staging.myapp.m3o.app",
+			Result: "myapp-staging",
+		},
+		{
+			Name:   "Dev host",
+			Host:   "127.0.0.1",
+			Result: "micro",
+		},
+		{
+			Name:   "Localhost",
+			Host:   "localhost",
+			Result: "micro",
+		},
+		{
+			Name:   "IP host",
+			Host:   "81.151.101.146",
+			Result: "micro",
+		},
+	}
+
+	for _, tc := range tt {
+		t.Run(tc.Name, func(t *testing.T) {
+			r := NewResolver(vpath.NewResolver())
+			result, err := r.Resolve(&http.Request{URL: &url.URL{Host: tc.Host, Path: "foo/bar"}})
+			if err != nil {
+				t.Fatal(err)
+			}
+			if result != nil {
+				if tc.Result != result.Domain {
+					t.Fatalf("Expected %v but got %v", tc.Result, result.Domain)
+				}
+			}
+		})
+	}
+}

api/resolver/vpath/vpath.go

@@ -0,0 +1,75 @@
+// Package vpath resolves using http path and recognised versioned urls
+package vpath
+
+import (
+	"errors"
+	"net/http"
+	"regexp"
+	"strings"
+
+	"github.com/unistack-org/micro/v3/api/resolver"
+)
+
+// NewResolver creates new vpath api resolver
+func NewResolver(opts ...resolver.Option) resolver.Resolver {
+	return &vpathResolver{opts: resolver.NewOptions(opts...)}
+}
+
+type vpathResolver struct {
+	opts resolver.Options
+}
+
+var re = regexp.MustCompile("^v[0-9]+$")
+
+// Resolve endpoint
+func (r *vpathResolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*resolver.Endpoint, error) {
+	if req.URL.Path == "/" {
+		return nil, errors.New("unknown name")
+	}
+
+	options := resolver.NewResolveOptions(opts...)
+
+	parts := strings.Split(req.URL.Path[1:], "/")
+	if len(parts) == 1 {
+		return &resolver.Endpoint{
+			Name:   r.withPrefix(parts...),
+			Host:   req.Host,
+			Method: req.Method,
+			Path:   req.URL.Path,
+			Domain: options.Domain,
+		}, nil
+	}
+
+	// /v1/foo
+	if re.MatchString(parts[0]) {
+		return &resolver.Endpoint{
+			Name:   r.withPrefix(parts[0:2]...),
+			Host:   req.Host,
+			Method: req.Method,
+			Path:   req.URL.Path,
+			Domain: options.Domain,
+		}, nil
+	}
+
+	return &resolver.Endpoint{
+		Name:   r.withPrefix(parts[0]),
+		Host:   req.Host,
+		Method: req.Method,
+		Path:   req.URL.Path,
+		Domain: options.Domain,
+	}, nil
+}
+
+func (r *vpathResolver) String() string {
+	return "vpath"
+}
+
+// withPrefix transforms "foo" into "go.micro.api.foo"
+func (r *vpathResolver) withPrefix(parts ...string) string {
+	p := r.opts.ServicePrefix
+	if len(p) > 0 {
+		parts = append([]string{p}, parts...)
+	}
+
+	return strings.Join(parts, ".")
+}

api/router/options.go

@@ -0,0 +1,75 @@
+package router
+
+import (
+	"context"
+
+	"github.com/unistack-org/micro/v3/api/resolver"
+	"github.com/unistack-org/micro/v3/api/resolver/vpath"
+	"github.com/unistack-org/micro/v3/logger"
+	"github.com/unistack-org/micro/v3/register"
+)
+
+// Options holds the options for api router
+type Options struct {
+	// Register for service lookup
+	Register register.Register
+	// Resolver to use
+	Resolver resolver.Resolver
+	// Logger micro logger
+	Logger logger.Logger
+	// Context is for external options
+	Context context.Context
+	// Handler name
+	Handler string
+}
+
+// Option func signature
+type Option func(o *Options)
+
+// NewOptions returns options struct filled by opts
+func NewOptions(opts ...Option) Options {
+	options := Options{
+		Context: context.Background(),
+		Handler: "meta",
+	}
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	if options.Resolver == nil {
+		options.Resolver = vpath.NewResolver(
+			resolver.WithHandler(options.Handler),
+		)
+	}
+
+	return options
+}
+
+// WithContext sets the context
+func WithContext(ctx context.Context) Option {
+	return func(o *Options) {
+		o.Context = ctx
+	}
+}
+
+// WithHandler sets the handler
+func WithHandler(h string) Option {
+	return func(o *Options) {
+		o.Handler = h
+	}
+}
+
+// WithRegister sets the register
+func WithRegister(r register.Register) Option {
+	return func(o *Options) {
+		o.Register = r
+	}
+}
+
+// WithResolver sets the resolver
+func WithResolver(r resolver.Resolver) Option {
+	return func(o *Options) {
+		o.Resolver = r
+	}
+}

api/router/router.go

@@ -0,0 +1,31 @@
+// Package router provides api service routing
+package router
+
+import (
+	"net/http"
+
+	"github.com/unistack-org/micro/v3/api"
+)
+
+// DefaultRouter contains default router implementation
+var DefaultRouter Router
+
+// Router is used to determine an endpoint for a request
+type Router interface {
+	// Returns options
+	Options() Options
+	// Init initialize router
+	Init(...Option) error
+	// Stop the router
+	Close() error
+	// Endpoint returns an api.Service endpoint or an error if it does not exist
+	Endpoint(r *http.Request) (*api.Service, error)
+	// Register endpoint in router
+	Register(ep *api.Endpoint) error
+	// Deregister endpoint from router
+	Deregister(ep *api.Endpoint) error
+	// Route returns an api.Service route
+	Route(r *http.Request) (*api.Service, error)
+	// String representation of router
+	String() string
+}

auth/auth.go

@@ -0,0 +1,141 @@
+// Package auth provides authentication and authorization capability
+package auth
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"github.com/unistack-org/micro/v3/metadata"
+)
+
+const (
+	// BearerScheme used for Authorization header
+	BearerScheme = "Bearer "
+	// ScopePublic is the scope applied to a rule to allow access to the public
+	ScopePublic = ""
+	// ScopeAccount is the scope applied to a rule to limit to users with any valid account
+	ScopeAccount = "*"
+)
+
+var (
+	// DefaultAuth holds default auth implementation
+	DefaultAuth Auth = NewAuth()
+	// ErrInvalidToken is when the token provided is not valid
+	ErrInvalidToken = errors.New("invalid token provided")
+	// ErrForbidden is when a user does not have the necessary scope to access a resource
+	ErrForbidden = errors.New("resource forbidden")
+)
+
+// Auth provides authentication and authorization
+type Auth interface {
+	// Init the auth
+	Init(opts ...Option) error
+	// Options set for auth
+	Options() Options
+	// Generate a new account
+	Generate(id string, opts ...GenerateOption) (*Account, error)
+	// Verify an account has access to a resource using the rules
+	Verify(acc *Account, res *Resource, opts ...VerifyOption) error
+	// Inspect a token
+	Inspect(token string) (*Account, error)
+	// Token generated using refresh token or credentials
+	Token(opts ...TokenOption) (*Token, error)
+	// Grant access to a resource
+	Grant(rule *Rule) error
+	// Revoke access to a resource
+	Revoke(rule *Rule) error
+	// Rules returns all the rules used to verify requests
+	Rules(...RulesOption) ([]*Rule, error)
+	// String returns the name of the implementation
+	String() string
+}
+
+// Account provided by an auth provider
+type Account struct {
+	// Metadata any other associated metadata
+	Metadata metadata.Metadata `json:"metadata"`
+	// ID of the account e.g. email or uuid
+	ID string `json:"id"`
+	// Type of the account, e.g. service
+	Type string `json:"type"`
+	// Issuer of the account
+	Issuer string `json:"issuer"`
+	// Secret for the account, e.g. the password
+	Secret string `json:"secret"`
+	// Scopes the account has access to
+	Scopes []string `json:"scopes"`
+}
+
+// Token can be short or long lived
+type Token struct {
+	// Time of token creation
+	Created time.Time `json:"created"`
+	// Time of token expiry
+	Expiry time.Time `json:"expiry"`
+	// The token to be used for accessing resources
+	AccessToken string `json:"access_token"`
+	// RefreshToken to be used to generate a new token
+	RefreshToken string `json:"refresh_token"`
+}
+
+// Expired returns a boolean indicating if the token needs to be refreshed
+func (t *Token) Expired() bool {
+	return t.Expiry.Unix() < time.Now().Unix()
+}
+
+// Resource is an entity such as a user or
+type Resource struct {
+	// Name of the resource, e.g. go.micro.service.notes
+	Name string `json:"name"`
+	// Type of resource, e.g. service
+	Type string `json:"type"`
+	// Endpoint resource e.g NotesService.Create
+	Endpoint string `json:"endpoint"`
+}
+
+// Access defines the type of access a rule grants
+type Access int
+
+const (
+	// AccessGranted to a resource
+	AccessGranted Access = iota
+	// AccessDenied to a resource
+	AccessDenied
+)
+
+// Rule is used to verify access to a resource
+type Rule struct {
+	// Resource that rule belongs to
+	Resource *Resource
+	// ID of the rule
+	ID string
+	// Scope of the rule
+	Scope string
+	// Access flag allow/deny
+	Access Access
+	// Priority holds the rule priority
+	Priority int32
+}
+
+type accountKey struct{}
+
+// AccountFromContext gets the account from the context, which
+// is set by the auth wrapper at the start of a call. If the account
+// is not set, a nil account will be returned. The error is only returned
+// when there was a problem retrieving an account
+func AccountFromContext(ctx context.Context) (*Account, bool) {
+	if ctx == nil {
+		return nil, false
+	}
+	acc, ok := ctx.Value(accountKey{}).(*Account)
+	return acc, ok
+}
+
+// ContextWithAccount sets the account in the context
+func ContextWithAccount(ctx context.Context, account *Account) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	return context.WithValue(ctx, accountKey{}, account)
+}

auth/noop.go

@@ -0,0 +1,79 @@
+package auth
+
+import (
+	"github.com/google/uuid"
+)
+
+type noopAuth struct {
+	opts Options
+}
+
+// String returns the name of the implementation
+func (n *noopAuth) String() string {
+	return "noop"
+}
+
+// Init the auth
+func (n *noopAuth) Init(opts ...Option) error {
+	for _, o := range opts {
+		o(&n.opts)
+	}
+	return nil
+}
+
+// Options set for auth
+func (n *noopAuth) Options() Options {
+	return n.opts
+}
+
+// Generate a new account
+func (n *noopAuth) Generate(id string, opts ...GenerateOption) (*Account, error) {
+	options := NewGenerateOptions(opts...)
+
+	return &Account{
+		ID:       id,
+		Secret:   options.Secret,
+		Metadata: options.Metadata,
+		Scopes:   options.Scopes,
+		Issuer:   n.Options().Issuer,
+	}, nil
+}
+
+// Grant access to a resource
+func (n *noopAuth) Grant(rule *Rule) error {
+	return nil
+}
+
+// Revoke access to a resource
+func (n *noopAuth) Revoke(rule *Rule) error {
+	return nil
+}
+
+// Rules used to verify requests
+func (n *noopAuth) Rules(opts ...RulesOption) ([]*Rule, error) {
+	return []*Rule{}, nil
+}
+
+// Verify an account has access to a resource
+func (n *noopAuth) Verify(acc *Account, res *Resource, opts ...VerifyOption) error {
+	return nil
+}
+
+// Inspect a token
+func (n *noopAuth) Inspect(token string) (*Account, error) {
+	uid, err := uuid.NewRandom()
+	if err != nil {
+		return nil, err
+	}
+	return &Account{ID: uid.String(), Issuer: n.Options().Issuer}, nil
+}
+
+// Token generation using an account id and secret
+func (n *noopAuth) Token(opts ...TokenOption) (*Token, error) {
+	return &Token{}, nil
+}
+
+// NewAuth returns new noop auth
+func NewAuth(opts ...Option) Auth {
+	return &noopAuth{opts: NewOptions(opts...)}
+}

auth/options.go

@@ -0,0 +1,311 @@
+package auth
+
+import (
+	"context"
+	"time"
+
+	"github.com/unistack-org/micro/v3/logger"
+	"github.com/unistack-org/micro/v3/metadata"
+	"github.com/unistack-org/micro/v3/meter"
+	"github.com/unistack-org/micro/v3/store"
+	"github.com/unistack-org/micro/v3/tracer"
+)
+
+// NewOptions creates Options struct from slice of options
+func NewOptions(opts ...Option) Options {
+	options := Options{
+		Tracer: tracer.DefaultTracer,
+		Logger: logger.DefaultLogger,
+		Meter:  meter.DefaultMeter,
+	}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}
+
+// Options struct holds auth options
+type Options struct {
+	// Context holds the external options
+	Context context.Context
+	// Meter used for metrics
+	Meter meter.Meter
+	// Logger used for logging
+	Logger logger.Logger
+	// Tracer used for tracing
+	Tracer tracer.Tracer
+	// Store used for stre data
+	Store store.Store
+	// Token is the services token used to authenticate itself
+	Token *Token
+	// LoginURL is the relative url path where a user can login
+	LoginURL string
+	// PrivateKey for encoding JWTs
+	PrivateKey string
+	// PublicKey for decoding JWTs
+	PublicKey string
+	// Secret is used to authenticate the service
+	Secret string
+	// ID is the services auth ID
+	ID string
+	// Issuer of the service's account
+	Issuer string
+	// Name holds the auth name
+	Name string
+	// Addrs sets the addresses of auth
+	Addrs []string
+}
+
+// Option func
+type Option func(o *Options)
+
+// Addrs is the auth addresses to use
+func Addrs(addrs ...string) Option {
+	return func(o *Options) {
+		o.Addrs = addrs
+	}
+}
+
+// Name sets the name
+func Name(n string) Option {
+	return func(o *Options) {
+		o.Name = n
+	}
+}
+
+// Issuer of the services account
+func Issuer(i string) Option {
+	return func(o *Options) {
+		o.Issuer = i
+	}
+}
+
+// Store to back auth
+func Store(s store.Store) Option {
+	return func(o *Options) {
+		o.Store = s
+	}
+}
+
+// PublicKey is the JWT public key
+func PublicKey(key string) Option {
+	return func(o *Options) {
+		o.PublicKey = key
+	}
+}
+
+// PrivateKey is the JWT private key
+func PrivateKey(key string) Option {
+	return func(o *Options) {
+		o.PrivateKey = key
+	}
+}
+
+// Credentials sets the auth credentials
+func Credentials(id, secret string) Option {
+	return func(o *Options) {
+		o.ID = id
+		o.Secret = secret
+	}
+}
+
+// ClientToken sets the auth token to use when making requests
+func ClientToken(token *Token) Option {
+	return func(o *Options) {
+		o.Token = token
+	}
+}
+
+// LoginURL sets the auth LoginURL
+func LoginURL(url string) Option {
+	return func(o *Options) {
+		o.LoginURL = url
+	}
+}
+
+// GenerateOptions struct
+type GenerateOptions struct {
+	Metadata metadata.Metadata
+	Provider string
+	Type     string
+	Secret   string
+	Issuer   string
+	Scopes   []string
+}
+
+// GenerateOption func
+type GenerateOption func(o *GenerateOptions)
+
+// WithSecret for the generated account
+func WithSecret(s string) GenerateOption {
+	return func(o *GenerateOptions) {
+		o.Secret = s
+	}
+}
+
+// WithType for the generated account
+func WithType(t string) GenerateOption {
+	return func(o *GenerateOptions) {
+		o.Type = t
+	}
+}
+
+// WithMetadata for the generated account
+func WithMetadata(md metadata.Metadata) GenerateOption {
+	return func(o *GenerateOptions) {
+		o.Metadata = metadata.Copy(md)
+	}
+}
+
+// WithProvider for the generated account
+func WithProvider(p string) GenerateOption {
+	return func(o *GenerateOptions) {
+		o.Provider = p
+	}
+}
+
+// WithScopes for the generated account
+func WithScopes(s ...string) GenerateOption {
+	return func(o *GenerateOptions) {
+		o.Scopes = s
+	}
+}
+
+// WithIssuer for the generated account
+func WithIssuer(i string) GenerateOption {
+	return func(o *GenerateOptions) {
+		o.Issuer = i
+	}
+}
+
+// NewGenerateOptions from a slice of options
+func NewGenerateOptions(opts ...GenerateOption) GenerateOptions {
+	var options GenerateOptions
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}
+
+// TokenOptions struct
+type TokenOptions struct {
+	ID           string
+	Secret       string
+	RefreshToken string
+	Issuer       string
+	Expiry       time.Duration
+}
+
+// TokenOption func
+type TokenOption func(o *TokenOptions)
+
+// WithExpiry for the token
+func WithExpiry(ex time.Duration) TokenOption {
+	return func(o *TokenOptions) {
+		o.Expiry = ex
+	}
+}
+
+// WithCredentials sets tye id and secret
+func WithCredentials(id, secret string) TokenOption {
+	return func(o *TokenOptions) {
+		o.ID = id
+		o.Secret = secret
+	}
+}
+
+// WithToken sets the refresh token
+func WithToken(rt string) TokenOption {
+	return func(o *TokenOptions) {
+		o.RefreshToken = rt
+	}
+}
+
+// WithTokenIssuer sets the token issuer option
+func WithTokenIssuer(iss string) TokenOption {
+	return func(o *TokenOptions) {
+		o.Issuer = iss
+	}
+}
+
+// NewTokenOptions from a slice of options
+func NewTokenOptions(opts ...TokenOption) TokenOptions {
+	var options TokenOptions
+	for _, o := range opts {
+		o(&options)
+	}
+
+	// set default expiry of token
+	if options.Expiry == 0 {
+		options.Expiry = time.Minute
+	}
+
+	return options
+}
+
+// VerifyOptions struct
+type VerifyOptions struct {
+	Context   context.Context
+	Namespace string
+}
+
+// VerifyOption func
+type VerifyOption func(o *VerifyOptions)
+
+// VerifyContext pass context to verify
+func VerifyContext(ctx context.Context) VerifyOption {
+	return func(o *VerifyOptions) {
+		o.Context = ctx
+	}
+}
+
+// VerifyNamespace sets thhe namespace for verify
+func VerifyNamespace(ns string) VerifyOption {
+	return func(o *VerifyOptions) {
+		o.Namespace = ns
+	}
+}
+
+// RulesOptions struct
+type RulesOptions struct {
+	Context   context.Context
+	Namespace string
+}
+
+// RulesOption func
+type RulesOption func(o *RulesOptions)
+
+// RulesContext pass rules context
+func RulesContext(ctx context.Context) RulesOption {
+	return func(o *RulesOptions) {
+		o.Context = ctx
+	}
+}
+
+// RulesNamespace sets the rule namespace
+func RulesNamespace(ns string) RulesOption {
+	return func(o *RulesOptions) {
+		o.Namespace = ns
+	}
+}
+
+// Logger sets the logger
+func Logger(l logger.Logger) Option {
+	return func(o *Options) {
+		o.Logger = l
+	}
+}
+
+// Meter sets the meter
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
+// Tracer sets the meter
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}

auth/rules.go

@@ -0,0 +1,92 @@
+package auth
+
+import (
+	"fmt"
+	"sort"
+	"strings"
+)
+
+// VerifyAccess an account has access to a resource using the rules provided. If the account does not have
+// access an error will be returned. If there are no rules provided which match the resource, an error
+// will be returned
+//nolint:gocyclo
+func VerifyAccess(rules []*Rule, acc *Account, res *Resource) error {
+	// the rule is only to be applied if the type matches the resource or is catch-all (*)
+	validTypes := []string{"*", res.Type}
+
+	// the rule is only to be applied if the name matches the resource or is catch-all (*)
+	validNames := []string{"*", res.Name}
+
+	// rules can have wildcard excludes on endpoints since this can also be a path for web services,
+	// e.g. /foo/* would include /foo/bar. We also want to check for wildcards and the exact endpoint
+	validEndpoints := []string{"*", res.Endpoint}
+	if comps := strings.Split(res.Endpoint, "/"); len(comps) > 1 {
+		for i := 1; i < len(comps)+1; i++ {
+			wildcard := fmt.Sprintf("%v/*", strings.Join(comps[0:i], "/"))
+			validEndpoints = append(validEndpoints, wildcard)
+		}
+	}
+
+	// filter the rules to the ones which match the criteria above
+	filteredRules := make([]*Rule, 0)
+	for _, rule := range rules {
+		if !include(validTypes, rule.Resource.Type) {
+			continue
+		}
+		if !include(validNames, rule.Resource.Name) {
+			continue
+		}
+		if !include(validEndpoints, rule.Resource.Endpoint) {
+			continue
+		}
+		filteredRules = append(filteredRules, rule)
+	}
+
+	// sort the filtered rules by priority, highest to lowest
+	sort.SliceStable(filteredRules, func(i, j int) bool {
+		return filteredRules[i].Priority > filteredRules[j].Priority
+	})
+
+	// loop through the rules and check for a rule which applies to this account
+	for _, rule := range filteredRules {
+		// a blank scope indicates the rule applies to everyone, even nil accounts
+		if rule.Scope == ScopePublic && rule.Access == AccessDenied {
+			return ErrForbidden
+		} else if rule.Scope == ScopePublic && rule.Access == AccessGranted {
+			return nil
+		}
+
+		// all further checks require an account
+		if acc == nil {
+			continue
+		}
+
+		// this rule applies to any account
+		if rule.Scope == ScopeAccount && rule.Access == AccessDenied {
+			return ErrForbidden
+		} else if rule.Scope == ScopeAccount && rule.Access == AccessGranted {
+			return nil
+		}
+
+		// if the account has the necessary scope
+		if include(acc.Scopes, rule.Scope) && rule.Access == AccessDenied {
+			return ErrForbidden
+		} else if include(acc.Scopes, rule.Scope) && rule.Access == AccessGranted {
+			return nil
+		}
+	}
+
+	// if no rules matched then return forbidden
+	return ErrForbidden
+}
+
+// include is a helper function which checks to see if the slice contains the value. includes is
+// not case sensitive.
+func include(slice []string, val string) bool {
+	for _, s := range slice {
+		if strings.EqualFold(s, val) {
+			return true
+		}
+	}
+	return false
+}

auth/rules_test.go

@@ -0,0 +1,288 @@
+package auth
+
+import (
+	"testing"
+)
+
+func TestVerify(t *testing.T) {
+	srvResource := &Resource{
+		Type:     "service",
+		Name:     "go.micro.service.foo",
+		Endpoint: "Foo.Bar",
+	}
+
+	webResource := &Resource{
+		Type:     "service",
+		Name:     "go.micro.web.foo",
+		Endpoint: "/foo/bar",
+	}
+
+	catchallResource := &Resource{
+		Type:     "*",
+		Name:     "*",
+		Endpoint: "*",
+	}
+
+	tt := []struct {
+		Error    error
+		Account  *Account
+		Resource *Resource
+		Name     string
+		Rules    []*Rule
+	}{
+		{
+			Name:     "NoRules",
+			Rules:    []*Rule{},
+			Account:  nil,
+			Resource: srvResource,
+			Error:    ErrForbidden,
+		},
+		{
+			Name:     "CatchallPublicAccount",
+			Account:  &Account{},
+			Resource: srvResource,
+			Rules: []*Rule{
+				{
+					Scope:    "",
+					Resource: catchallResource,
+				},
+			},
+		},
+		{
+			Name:     "CatchallPublicNoAccount",
+			Resource: srvResource,
+			Rules: []*Rule{
+				{
+					Scope:    "",
+					Resource: catchallResource,
+				},
+			},
+		},
+		{
+			Name:     "CatchallPrivateAccount",
+			Account:  &Account{},
+			Resource: srvResource,
+			Rules: []*Rule{
+				{
+					Scope:    "*",
+					Resource: catchallResource,
+				},
+			},
+		},
+		{
+			Name:     "CatchallPrivateNoAccount",
+			Resource: srvResource,
+			Rules: []*Rule{
+				{
+					Scope:    "*",
+					Resource: catchallResource,
+				},
+			},
+			Error: ErrForbidden,
+		},
+		{
+			Name:     "CatchallServiceRuleMatch",
+			Resource: srvResource,
+			Account:  &Account{},
+			Rules: []*Rule{
+				{
+					Scope: "*",
+					Resource: &Resource{
+						Type:     srvResource.Type,
+						Name:     srvResource.Name,
+						Endpoint: "*",
+					},
+				},
+			},
+		},
+		{
+			Name:     "CatchallServiceRuleNoMatch",
+			Resource: srvResource,
+			Account:  &Account{},
+			Rules: []*Rule{
+				{
+					Scope: "*",
+					Resource: &Resource{
+						Type:     srvResource.Type,
+						Name:     "wrongname",
+						Endpoint: "*",
+					},
+				},
+			},
+			Error: ErrForbidden,
+		},
+		{
+			Name:     "ExactRuleValidScope",
+			Resource: srvResource,
+			Account: &Account{
+				Scopes: []string{"neededscope"},
+			},
+			Rules: []*Rule{
+				{
+					Scope:    "neededscope",
+					Resource: srvResource,
+				},
+			},
+		},
+		{
+			Name:     "ExactRuleInvalidScope",
+			Resource: srvResource,
+			Account: &Account{
+				Scopes: []string{"neededscope"},
+			},
+			Rules: []*Rule{
+				{
+					Scope:    "invalidscope",
+					Resource: srvResource,
+				},
+			},
+			Error: ErrForbidden,
+		},
+		{
+			Name:     "CatchallDenyWithAccount",
+			Resource: srvResource,
+			Account:  &Account{},
+			Rules: []*Rule{
+				{
+					Scope:    "*",
+					Resource: catchallResource,
+					Access:   AccessDenied,
+				},
+			},
+			Error: ErrForbidden,
+		},
+		{
+			Name:     "CatchallDenyWithNoAccount",
+			Resource: srvResource,
+			Account:  &Account{},
+			Rules: []*Rule{
+				{
+					Scope:    "*",
+					Resource: catchallResource,
+					Access:   AccessDenied,
+				},
+			},
+			Error: ErrForbidden,
+		},
+		{
+			Name:     "RulePriorityGrantFirst",
+			Resource: srvResource,
+			Account:  &Account{},
+			Rules: []*Rule{
+				{
+					Scope:    "*",
+					Resource: catchallResource,
+					Access:   AccessGranted,
+					Priority: 1,
+				},
+				{
+					Scope:    "*",
+					Resource: catchallResource,
+					Access:   AccessDenied,
+					Priority: 0,
+				},
+			},
+		},
+		{
+			Name:     "RulePriorityDenyFirst",
+			Resource: srvResource,
+			Account:  &Account{},
+			Rules: []*Rule{
+				{
+					Scope:    "*",
+					Resource: catchallResource,
+					Access:   AccessGranted,
+					Priority: 0,
+				},
+				{
+					Scope:    "*",
+					Resource: catchallResource,
+					Access:   AccessDenied,
+					Priority: 1,
+				},
+			},
+			Error: ErrForbidden,
+		},
+		{
+			Name:     "WebExactEndpointValid",
+			Resource: webResource,
+			Account:  &Account{},
+			Rules: []*Rule{
+				{
+					Scope:    "*",
+					Resource: webResource,
+				},
+			},
+		},
+		{
+			Name:     "WebExactEndpointInalid",
+			Resource: webResource,
+			Account:  &Account{},
+			Rules: []*Rule{
+				{
+					Scope: "*",
+					Resource: &Resource{
+						Type:     webResource.Type,
+						Name:     webResource.Name,
+						Endpoint: "invalidendpoint",
+					},
+				},
+			},
+			Error: ErrForbidden,
+		},
+		{
+			Name:     "WebWildcardEndpoint",
+			Resource: webResource,
+			Account:  &Account{},
+			Rules: []*Rule{
+				{
+					Scope: "*",
+					Resource: &Resource{
+						Type:     webResource.Type,
+						Name:     webResource.Name,
+						Endpoint: "*",
+					},
+				},
+			},
+		},
+		{
+			Name:     "WebWildcardPathEndpointValid",
+			Resource: webResource,
+			Account:  &Account{},
+			Rules: []*Rule{
+				{
+					Scope: "*",
+					Resource: &Resource{
+						Type:     webResource.Type,
+						Name:     webResource.Name,
+						Endpoint: "/foo/*",
+					},
+				},
+			},
+		},
+		{
+			Name:     "WebWildcardPathEndpointInvalid",
+			Resource: webResource,
+			Account:  &Account{},
+			Rules: []*Rule{
+				{
+					Scope: "*",
+					Resource: &Resource{
+						Type:     webResource.Type,
+						Name:     webResource.Name,
+						Endpoint: "/bar/*",
+					},
+				},
+			},
+			Error: ErrForbidden,
+		},
+	}
+
+	for _, tc := range tt {
+		t.Run(tc.Name, func(t *testing.T) {
+			if err := VerifyAccess(tc.Rules, tc.Account, tc.Resource); err != tc.Error {
+				t.Errorf("Expected %v but got %v", tc.Error, err)
+			}
+		})
+	}
+}

broker/broker.go

@@ -1,80 +1,48 @@
 // Package broker is an interface used for asynchronous messaging
-package broker // import "go.unistack.org/micro/v4/broker"
+package broker
 
 import (
 	"context"
-	"errors"
-	"time"
 
-	"go.unistack.org/micro/v4/metadata"
+	"github.com/unistack-org/micro/v3/metadata"
-	"go.unistack.org/micro/v4/options"
 )
 
-// DefaultBroker default memory broker
+// DefaultBroker default 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 message has nvalid format
-	ErrInvalidMessage = errors.New("broker message has invalid format")
-	// 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(...Option) error
-	Init(opts ...options.Option) error
-	// Options returns broker options
 	Options() Options
-	// Address return configured address
 	Address() string
-	// Connect connects to broker
+	Connect(context.Context) error
-	Connect(ctx context.Context) error
+	Disconnect(context.Context) error
-	// Disconnect disconnect from broker
+	Publish(context.Context, string, *Message, ...PublishOption) error
-	Disconnect(ctx context.Context) error
+	Subscribe(context.Context, string, Handler, ...SubscribeOption) (Subscriber, error)
-	// Publish message, msg can be single broker.Message or []broker.Message
-	Publish(ctx context.Context, msg interface{}, opts ...options.Option) error
-	// Subscribe subscribes to topic message via handler
-	Subscribe(ctx context.Context, topic string, handler interface{}, opts ...options.Option) (Subscriber, error)
-	// String type of broker
 	String() string
 }
 
-// Message is given to a subscription handler for processing
+// Handler is used to process messages via a subscription of a topic.
-type Message interface {
+type Handler func(Event) error
-	// Context for the message
+
-	Context() context.Context
+// Event is given to a subscription handler for processing
-	// Topic
+type Event interface {
 	Topic() string
-	// Header returns message headers
+	Message() *Message
-	Header() metadata.Metadata
-	// Body returns broker message may be []byte slice or some go struct
-	Body() interface{}
-	// Ack acknowledge message
 	Ack() error
-	// Error returns message error (like decoding errors or some other)
-	// In this case Body contains raw []byte from broker
 	Error() error
 }
 
+// Message is used to transfer data
+type Message struct {
+	Header metadata.Metadata // contains message metadata
+	Body   []byte            // contains message body
+}
+
 // 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 from topic
+	Unsubscribe(context.Context) error
-	Unsubscribe(ctx context.Context) error
 }
-
-// MessageHandler func signature for single message processing
-type MessageHandler func(Message) error
-
-// MessagesHandler func signature for batch message processing
-type MessagesHandler func([]Message) error

broker/context.go

@@ -22,3 +22,33 @@ func NewContext(ctx context.Context, s Broker) context.Context {
 	}
 	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)
+	}
+}
+
+// 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)
+	}
+}
+
+// SetPublishOption returns a function to setup a context with given value
+func SetPublishOption(k, v interface{}) PublishOption {
+	return func(o *PublishOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}

broker/context_test.go

@@ -1,39 +0,0 @@
-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")
-	}
-}

broker/memory.go

@@ -2,38 +2,49 @@ package broker
 
 import (
 	"context"
-	"fmt"
+	"errors"
 	"sync"
-	"time"
 
-	"go.unistack.org/micro/v4/codec"
+	"github.com/google/uuid"
-	"go.unistack.org/micro/v4/logger"
+	"github.com/unistack-org/micro/v3/logger"
-	"go.unistack.org/micro/v4/metadata"
+	maddr "github.com/unistack-org/micro/v3/util/addr"
-	"go.unistack.org/micro/v4/options"
+	mnet "github.com/unistack-org/micro/v3/util/net"
-	"go.unistack.org/micro/v4/semconv"
+	"github.com/unistack-org/micro/v3/util/rand"
-	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 {
+type memoryBroker struct {
-	subscribers map[string][]*memorySubscriber
+	Subscribers map[string][]*memorySubscriber
 	addr        string
 	opts        Options
 	sync.RWMutex
 	connected bool
 }
 
-func (m *MemoryBroker) Options() Options {
+type memoryEvent struct {
+	err     error
+	message interface{}
+	topic   string
+	opts    Options
+}
+
+type memorySubscriber struct {
+	ctx     context.Context
+	exit    chan bool
+	handler Handler
+	id      string
+	topic   string
+	opts    SubscribeOptions
+}
+
+func (m *memoryBroker) Options() Options {
 	return m.opts
 }
 
-func (m *MemoryBroker) Address() string {
+func (m *memoryBroker) Address() string {
 	return m.addr
 }
 
-func (m *MemoryBroker) Connect(ctx context.Context) error {
+func (m *memoryBroker) Connect(ctx context.Context) error {
 	m.Lock()
 	defer m.Unlock()
 
@@ -57,184 +68,94 @@ func (m *MemoryBroker) Connect(ctx context.Context) error {
 	return nil
 }
 
-func (m *MemoryBroker) Disconnect(ctx context.Context) error {
+func (m *memoryBroker) Disconnect(ctx context.Context) error {
 	m.Lock()
 	defer m.Unlock()
 
-	select {
+	if !m.connected {
-	case <-ctx.Done():
+		return nil
-		return ctx.Err()
+	}
-	default:
+
-		if m.connected {
 	m.connected = false
-		}
-	}
 
 	return nil
 }
 
-func (m *MemoryBroker) Init(opts ...options.Option) error {
+func (m *memoryBroker) Init(opts ...Option) error {
-	var err error
 	for _, o := range opts {
-		if err = o(&m.opts); err != nil {
+		o(&m.opts)
-			return err
-		}
 	}
 	return nil
 }
 
-func (m *MemoryBroker) Publish(ctx context.Context, message interface{}, opts ...options.Option) error {
+func (m *memoryBroker) Publish(ctx context.Context, topic string, msg *Message, opts ...PublishOption) error {
 	m.RLock()
 	if !m.connected {
 		m.RUnlock()
-		return ErrNotConnected
+		return errors.New("not connected")
 	}
+
+	subs, ok := m.Subscribers[topic]
 	m.RUnlock()
-
-	var err error
-
-	select {
-	case <-ctx.Done():
-		return ctx.Err()
-	default:
-		options := NewPublishOptions(opts...)
-		var msgs []Message
-		switch v := message.(type) {
-		case []Message:
-			msgs = v
-		case Message:
-			msgs = append(msgs, v)
-		default:
-			return ErrInvalidMessage
-		}
-		msgTopicMap := make(map[string][]*memoryMessage)
-		for _, msg := range msgs {
-			p := &memoryMessage{opts: options}
-			p.topic, _ = msg.Header().Get(metadata.HeaderTopic)
-			if v, ok := msg.Body().(*codec.Frame); ok {
-				p.body = msg.Body()
-			} else if len(m.opts.Codecs) == 0 {
-				p.body = msg.Body()
-			} else {
-				cf, ok := m.opts.Codecs[options.ContentType]
 	if !ok {
-					return fmt.Errorf("%s: %s", codec.ErrUnknownContentType, options.ContentType)
+		return nil
 	}
-				p.body, err = cf.Marshal(v)
+
+	var v interface{}
+	if m.opts.Codec != nil {
+		buf, err := m.opts.Codec.Marshal(msg)
 		if err != nil {
 			return err
 		}
+		v = buf
+	} else {
+		v = msg
 	}
-			msgTopicMap[p.topic] = append(msgTopicMap[p.topic], p)
+
+	p := &memoryEvent{
+		topic:   topic,
+		message: v,
+		opts:    m.opts,
 	}
 
 	eh := m.opts.ErrorHandler
 
-		for t, ms := range msgTopicMap {
-			ts := time.Now()
-
-			m.opts.Meter.Counter(semconv.PublishMessageInflight, "endpoint", t).Add(len(ms))
-			m.opts.Meter.Counter(semconv.SubscribeMessageInflight, "endpoint", t).Add(len(ms))
-
-			m.RLock()
-			subs, ok := m.subscribers[t]
-			m.RUnlock()
-			if !ok {
-				m.opts.Meter.Counter(semconv.PublishMessageTotal, "endpoint", t, "status", "failure").Add(len(ms))
-				m.opts.Meter.Counter(semconv.PublishMessageInflight, "endpoint", t).Add(-len(ms))
-				m.opts.Meter.Counter(semconv.SubscribeMessageInflight, "endpoint", t).Add(-len(ms))
-				continue
-			}
-
-			m.opts.Meter.Counter(semconv.PublishMessageTotal, "endpoint", t, "status", "success").Add(len(ms))
 	for _, sub := range subs {
+		if err := sub.handler(p); err != nil {
+			p.err = err
 			if sub.opts.ErrorHandler != nil {
 				eh = sub.opts.ErrorHandler
 			}
-
-				switch mh := sub.handler.(type) {
-				case MessagesHandler:
-					mhs := make([]Message, 0, len(ms))
-					for _, m := range ms {
-						mhs = append(mhs, m)
-					}
-					if err = mh(mhs); err != nil {
-						m.opts.Meter.Counter(semconv.SubscribeMessageTotal, "endpoint", t, "status", "failure").Add(len(ms))
 			if eh != nil {
-							switch meh := eh.(type) {
+				eh(p)
-							case MessagesHandler:
-								_ = meh(mhs)
-							case MessageHandler:
-								for _, me := range mhs {
-									_ = meh(me)
-								}
-							}
 			} else if m.opts.Logger.V(logger.ErrorLevel) {
 				m.opts.Logger.Error(m.opts.Context, err.Error())
 			}
+			continue
 		}
-				case MessageHandler:
-					for _, p := range ms {
-						if err = mh(p); err != nil {
-							m.opts.Meter.Counter(semconv.SubscribeMessageTotal, "endpoint", t, "status", "failure").Inc()
-							if eh != nil {
-								switch meh := eh.(type) {
-								case MessageHandler:
-									_ = meh(p)
-								case MessagesHandler:
-									_ = meh([]Message{p})
-								}
-							} else if m.opts.Logger.V(logger.ErrorLevel) {
-								m.opts.Logger.Error(m.opts.Context, err.Error())
-							}
-						} else {
-							if sub.opts.AutoAck {
-								if err = p.Ack(); err != nil {
-									m.opts.Logger.Error(m.opts.Context, "ack failed: "+err.Error())
-									m.opts.Meter.Counter(semconv.SubscribeMessageTotal, "endpoint", t, "status", "failure").Inc()
-								} else {
-									m.opts.Meter.Counter(semconv.SubscribeMessageTotal, "endpoint", t, "status", "success").Inc()
-								}
-							} else {
-								m.opts.Meter.Counter(semconv.SubscribeMessageTotal, "endpoint", t, "status", "success").Inc()
-							}
-						}
-						m.opts.Meter.Counter(semconv.PublishMessageInflight, "endpoint", t).Add(-1)
-						m.opts.Meter.Counter(semconv.SubscribeMessageInflight, "endpoint", t).Add(-1)
-					}
-				}
-			}
-
-			te := time.Since(ts)
-			m.opts.Meter.Summary(semconv.PublishMessageLatencyMicroseconds, "endpoint", t).Update(te.Seconds())
-			m.opts.Meter.Histogram(semconv.PublishMessageDurationSeconds, "endpoint", t).Update(te.Seconds())
-			m.opts.Meter.Summary(semconv.SubscribeMessageLatencyMicroseconds, "endpoint", t).Update(te.Seconds())
-			m.opts.Meter.Histogram(semconv.SubscribeMessageDurationSeconds, "endpoint", t).Update(te.Seconds())
-		}
-
 	}
 
 	return nil
 }
 
-func (m *MemoryBroker) Subscribe(ctx context.Context, topic string, handler interface{}, opts ...options.Option) (Subscriber, error) {
+func (m *memoryBroker) Subscribe(ctx context.Context, topic string, handler Handler, opts ...SubscribeOption) (Subscriber, error) {
 	m.RLock()
 	if !m.connected {
 		m.RUnlock()
-		return nil, ErrNotConnected
+		return nil, errors.New("not connected")
 	}
 	m.RUnlock()
 
-	sid, err := id.New()
+	options := NewSubscribeOptions(opts...)
+
+	id, err := uuid.NewRandom()
 	if err != nil {
 		return nil, err
 	}
 
-	options := NewSubscribeOptions(opts...)
-
 	sub := &memorySubscriber{
 		exit:    make(chan bool, 1),
-		id:      sid,
+		id:      id.String(),
 		topic:   topic,
 		handler: handler,
 		opts:    options,
@@ -242,76 +163,64 @@ func (m *MemoryBroker) Subscribe(ctx context.Context, topic string, handler inte
 	}
 
 	m.Lock()
-	m.subscribers[topic] = append(m.subscribers[topic], sub)
+	m.Subscribers[topic] = append(m.Subscribers[topic], sub)
 	m.Unlock()
 
 	go func() {
 		<-sub.exit
 		m.Lock()
-		newSubscribers := make([]*memorySubscriber, 0, len(m.subscribers)-1)
+		var newSubscribers []*memorySubscriber
-		for _, sb := range m.subscribers[topic] {
+		for _, sb := range m.Subscribers[topic] {
 			if sb.id == sub.id {
 				continue
 			}
 			newSubscribers = append(newSubscribers, sb)
 		}
-		m.subscribers[topic] = newSubscribers
+		m.Subscribers[topic] = newSubscribers
 		m.Unlock()
 	}()
 
 	return sub, nil
 }
 
-func (m *MemoryBroker) String() string {
+func (m *memoryBroker) String() string {
 	return "memory"
 }
 
-func (m *MemoryBroker) Name() string {
+func (m *memoryBroker) Name() string {
 	return m.opts.Name
 }
 
-type memoryMessage struct {
+func (m *memoryEvent) Topic() string {
-	err    error
-	body   interface{}
-	topic  string
-	header metadata.Metadata
-	opts   PublishOptions
-	ctx    context.Context
-}
-
-func (m *memoryMessage) Topic() string {
 	return m.topic
 }
 
-func (m *memoryMessage) Header() metadata.Metadata {
+func (m *memoryEvent) Message() *Message {
-	return m.header
+	switch v := m.message.(type) {
+	case *Message:
+		return v
+	case []byte:
+		msg := &Message{}
+		if err := m.opts.Codec.Unmarshal(v, msg); err != nil {
+			if m.opts.Logger.V(logger.ErrorLevel) {
+				m.opts.Logger.Error(m.opts.Context, "[memory]: failed to unmarshal: %v", err)
+			}
+			return nil
+		}
+		return msg
 	}
 
-func (m *memoryMessage) Body() interface{} {
-	return m.body
-}
-
-func (m *memoryMessage) Ack() error {
 	return nil
 }
 
-func (m *memoryMessage) Error() error {
+func (m *memoryEvent) Ack() error {
+	return nil
+}
+
+func (m *memoryEvent) Error() error {
 	return m.err
 }
 
-func (m *memoryMessage) Context() context.Context {
-	return m.ctx
-}
-
-type memorySubscriber struct {
-	ctx     context.Context
-	exit    chan bool
-	handler interface{}
-	id      string
-	topic   string
-	opts    SubscribeOptions
-}
-
 func (m *memorySubscriber) Options() SubscribeOptions {
 	return m.opts
 }
@@ -326,9 +235,9 @@ func (m *memorySubscriber) Unsubscribe(ctx context.Context) error {
 }
 
 // NewBroker return new memory broker
-func NewBroker(opts ...options.Option) *MemoryBroker {
+func NewBroker(opts ...Option) Broker {
-	return &MemoryBroker{
+	return &memoryBroker{
 		opts:        NewOptions(opts...),
-		subscribers: make(map[string][]*memorySubscriber),
+		Subscribers: make(map[string][]*memorySubscriber),
 	}
 }

broker/memory_test.go

@@ -4,62 +4,8 @@ import (
 	"context"
 	"fmt"
 	"testing"
-
-	"go.unistack.org/micro/v4/metadata"
 )
 
-func TestMemoryBatchBroker(t *testing.T) {
-	b := NewBroker()
-	ctx := context.Background()
-
-	if err := b.Connect(ctx); err != nil {
-		t.Fatalf("Unexpected connect error %v", err)
-	}
-
-	topic := "test"
-	count := 10
-
-	fn := func(evts []Message) error {
-		var err error
-		for _, evt := range evts {
-			if err = evt.Ack(); err != nil {
-				return err
-			}
-		}
-		return nil
-	}
-
-	sub, err := b.Subscribe(ctx, topic, fn)
-	if err != nil {
-		t.Fatalf("Unexpected error subscribing %v", err)
-	}
-
-	msgs := make([]Message, 0, count)
-	for i := 0; i < count; i++ {
-		message := &memoryMessage{
-			header: metadata.Metadata{
-				metadata.HeaderTopic: []string{topic},
-				"foo":                []string{"bar"},
-				"id":                 []string{fmt.Sprintf("%d", i)},
-			},
-			body: []byte(`"hello world"`),
-		}
-		msgs = append(msgs, message)
-	}
-
-	if err := b.Publish(ctx, msgs); err != nil {
-		t.Fatalf("Unexpected error publishing %v", err)
-	}
-
-	if err := sub.Unsubscribe(ctx); err != nil {
-		t.Fatalf("Unexpected error unsubscribing from %s: %v", topic, err)
-	}
-
-	if err := b.Disconnect(ctx); err != nil {
-		t.Fatalf("Unexpected connect error %v", err)
-	}
-}
-
 func TestMemoryBroker(t *testing.T) {
 	b := NewBroker()
 	ctx := context.Background()
@@ -71,8 +17,8 @@ func TestMemoryBroker(t *testing.T) {
 	topic := "test"
 	count := 10
 
-	fn := func(p Message) error {
+	fn := func(p Event) error {
-		return p.Ack()
+		return nil
 	}
 
 	sub, err := b.Subscribe(ctx, topic, fn)
@@ -80,21 +26,18 @@ func TestMemoryBroker(t *testing.T) {
 		t.Fatalf("Unexpected error subscribing %v", err)
 	}
 
-	msgs := make([]Message, 0, count)
 	for i := 0; i < count; i++ {
-		message := &memoryMessage{
+		message := &Message{
-			header: metadata.Metadata{
+			Header: map[string]string{
-				metadata.HeaderTopic: []string{topic},
+				"foo": "bar",
-				"foo":                []string{"bar"},
+				"id":  fmt.Sprintf("%d", i),
-				"id":                 []string{fmt.Sprintf("%d", i)},
 			},
-			body: []byte(`"hello world"`),
+			Body: []byte(`hello world`),
-		}
-		msgs = append(msgs, message)
 		}
 
-	if err := b.Publish(ctx, msgs); err != nil {
+		if err := b.Publish(ctx, topic, message); err != nil {
-		t.Fatalf("Unexpected error publishing %v", err)
+			t.Fatalf("Unexpected error publishing %d", i)
+		}
 	}
 
 	if err := sub.Unsubscribe(ctx); err != nil {

broker/options.go

@@ -3,16 +3,12 @@ package broker
 import (
 	"context"
 	"crypto/tls"
-	"time"
 
-	"go.unistack.org/micro/v4/codec"
+	"github.com/unistack-org/micro/v3/codec"
-	"go.unistack.org/micro/v4/logger"
+	"github.com/unistack-org/micro/v3/logger"
-	"go.unistack.org/micro/v4/metadata"
+	"github.com/unistack-org/micro/v3/meter"
-	"go.unistack.org/micro/v4/meter"
+	"github.com/unistack-org/micro/v3/register"
-	"go.unistack.org/micro/v4/options"
+	"github.com/unistack-org/micro/v3/tracer"
-	"go.unistack.org/micro/v4/register"
-	"go.unistack.org/micro/v4/sync"
-	"go.unistack.org/micro/v4/tracer"
 )
 
 // Options struct
@@ -21,8 +17,8 @@ type Options struct {
 	Tracer tracer.Tracer
 	// Register can be used for clustering
 	Register register.Register
-	// Codecs holds the codec for marshal/unmarshal
+	// Codec holds the codec for marshal/unmarshal
-	Codecs map[string]codec.Codec
+	Codec codec.Codec
 	// Logger used for logging
 	Logger logger.Logger
 	// Meter used for metrics
@@ -31,137 +27,222 @@ type Options struct {
 	Context context.Context
 	// TLSConfig holds tls.TLSConfig options
 	TLSConfig *tls.Config
-	// ErrorHandler used when broker have error while processing message
+	// ErrorHandler used when broker can't unmarshal incoming message
-	ErrorHandler interface{}
+	ErrorHandler Handler
 	// Name holds the broker name
 	Name string
-	// Address holds the broker address
+	// Addrs holds the broker address
-	Address []string
+	Addrs []string
-
-	Wait *sync.WaitGroup
-
-	GracefulTimeout time.Duration
 }
 
 // NewOptions create new Options
-func NewOptions(opts ...options.Option) Options {
+func NewOptions(opts ...Option) Options {
-	newOpts := Options{
+	options := Options{
 		Register: register.DefaultRegister,
 		Logger:   logger.DefaultLogger,
 		Context:  context.Background(),
 		Meter:    meter.DefaultMeter,
-		Codecs:          make(map[string]codec.Codec),
+		Codec:    codec.DefaultCodec,
 		Tracer:   tracer.DefaultTracer,
-		GracefulTimeout: DefaultGracefulTimeout,
 	}
 	for _, o := range opts {
-		o(&newOpts)
+		o(&options)
+	}
+	return options
+}
+
+// Context sets the context option
+func Context(ctx context.Context) Option {
+	return func(o *Options) {
+		o.Context = ctx
 	}
-	return newOpts
 }
 
 // PublishOptions struct
 type PublishOptions struct {
 	// Context holds external options
 	Context context.Context
-	// Message metadata usually passed as message headers
-	Metadata metadata.Metadata
-	// Content-Type of message for marshal
-	ContentType string
-	// Topic destination
-	Topic string
 	// BodyOnly flag says the message contains raw body bytes
 	BodyOnly bool
 }
 
 // NewPublishOptions creates PublishOptions struct
-func NewPublishOptions(opts ...options.Option) PublishOptions {
+func NewPublishOptions(opts ...PublishOption) PublishOptions {
 	options := PublishOptions{
 		Context: context.Background(),
 	}
+
 	for _, o := range opts {
 		o(&options)
 	}
-	return options
-}
 
-// PublishTopic pass topic for messages
+	return options
-func PublishTopic(t string) options.Option {
-	return func(src interface{}) error {
-		return options.Set(src, t, ".Topic")
-	}
 }
 
 // SubscribeOptions struct
 type SubscribeOptions struct {
 	// Context holds external options
 	Context context.Context
-	// ErrorHandler used when broker have error while processing message
+	// ErrorHandler used when broker can't unmarshal incoming message
-	ErrorHandler interface{}
+	ErrorHandler Handler
-	// QueueGroup holds consumer group
+	// Group holds consumer group
-	QueueGroup string
+	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
 }
 
-// ErrorHandler will catch all broker errors that cant be handled
+// Option func
-// in normal way, for example Codec errors
+type Option func(*Options)
-func ErrorHandler(h interface{}) options.Option {
+
-	return func(src interface{}) error {
+// PublishOption func
-		return options.Set(src, h, ".ErrorHandler")
+type PublishOption func(*PublishOptions)
+
+// PublishBodyOnly publish only body of the message
+func PublishBodyOnly(b bool) PublishOption {
+	return func(o *PublishOptions) {
+		o.BodyOnly = b
 	}
 }
 
+// PublishContext sets the context
+func PublishContext(ctx context.Context) PublishOption {
+	return func(o *PublishOptions) {
+		o.Context = ctx
+	}
+}
+
+// SubscribeOption func
+type SubscribeOption func(*SubscribeOptions)
+
 // NewSubscribeOptions creates new SubscribeOptions
-func NewSubscribeOptions(opts ...options.Option) SubscribeOptions {
+func NewSubscribeOptions(opts ...SubscribeOption) SubscribeOptions {
 	options := SubscribeOptions{
 		AutoAck: true,
 		Context: context.Background(),
 	}
+
 	for _, o := range opts {
 		o(&options)
 	}
+
 	return options
 }
 
-// SubscribeAutoAck contol auto acking of messages
+// Addrs sets the host addresses to be used by the broker
+func Addrs(addrs ...string) Option {
+	return func(o *Options) {
+		o.Addrs = addrs
+	}
+}
+
+// Codec sets the codec used for encoding/decoding used where
+// a broker does not support headers
+func Codec(c codec.Codec) Option {
+	return func(o *Options) {
+		o.Codec = c
+	}
+}
+
+// DisableAutoAck disables auto ack
+func DisableAutoAck() SubscribeOption {
+	return func(o *SubscribeOptions) {
+		o.AutoAck = false
+	}
+}
+
+// SubscribeAutoAck will disable auto acking of messages
 // after they have been handled.
-func SubscribeAutoAck(b bool) options.Option {
+func SubscribeAutoAck(b bool) SubscribeOption {
-	return func(src interface{}) error {
+	return func(o *SubscribeOptions) {
-		return options.Set(src, b, ".AutoAck")
+		o.AutoAck = b
 	}
 }
 
-// BodyOnly transfer only body without
+// SubscribeBodyOnly consumes only body of the message
-func BodyOnly(b bool) options.Option {
+func SubscribeBodyOnly(b bool) SubscribeOption {
-	return func(src interface{}) error {
+	return func(o *SubscribeOptions) {
-		return options.Set(src, b, ".BodyOnly")
+		o.BodyOnly = b
 	}
 }
 
-// SubscribeBatchSize specifies max batch size
+// ErrorHandler will catch all broker errors that cant be handled
-func SubscribeBatchSize(n int) options.Option {
+// in normal way, for example Codec errors
-	return func(src interface{}) error {
+func ErrorHandler(h Handler) Option {
-		return options.Set(src, n, ".BatchSize")
+	return func(o *Options) {
+		o.ErrorHandler = h
 	}
 }
 
-// SubscribeBatchWait specifies max batch wait time
+// SubscribeErrorHandler will catch all broker errors that cant be handled
-func SubscribeBatchWait(td time.Duration) options.Option {
+// in normal way, for example Codec errors
-	return func(src interface{}) error {
+func SubscribeErrorHandler(h Handler) SubscribeOption {
-		return options.Set(src, td, ".BatchWait")
+	return func(o *SubscribeOptions) {
+		o.ErrorHandler = h
 	}
 }
 
-// SubscribeQueueGroup sets the shared queue name distributed messages across subscribers
+// Queue sets the subscribers queue
-func SubscribeQueueGroup(n string) options.Option {
+// Deprecated
-	return func(src interface{}) error {
+func Queue(name string) SubscribeOption {
-		return options.Set(src, n, ".QueueGroup")
+	return func(o *SubscribeOptions) {
+		o.Group = name
+	}
+}
+
+// SubscribeGroup sets the name of the queue to share messages on
+func SubscribeGroup(name string) SubscribeOption {
+	return func(o *SubscribeOptions) {
+		o.Group = name
+	}
+}
+
+// Register sets register option
+func Register(r register.Register) Option {
+	return func(o *Options) {
+		o.Register = r
+	}
+}
+
+// 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
+	}
+}
+
+// SubscribeContext set context
+func SubscribeContext(ctx context.Context) SubscribeOption {
+	return func(o *SubscribeOptions) {
+		o.Context = ctx
 	}
 }

broker/subscriber.go

@@ -1,98 +0,0 @@
-package broker
-
-import (
-	"fmt"
-	"reflect"
-	"strings"
-	"unicode"
-	"unicode/utf8"
-)
-
-const (
-	subSig      = "func(context.Context, interface{}) error"
-	batchSubSig = "func([]context.Context, []interface{}) error"
-)
-
-// Precompute the reflect type for error. Can't use error directly
-// because Typeof takes an empty interface value. This is annoying.
-var typeOfError = reflect.TypeOf((*error)(nil)).Elem()
-
-// Is this an exported - upper case - name?
-func isExported(name string) bool {
-	r, _ := utf8.DecodeRuneInString(name)
-	return unicode.IsUpper(r)
-}
-
-// Is this type exported or a builtin?
-func isExportedOrBuiltinType(t reflect.Type) bool {
-	for t.Kind() == reflect.Ptr {
-		t = t.Elem()
-	}
-	// PkgPath will be non-empty even for an exported type,
-	// so we need to check the type name as well.
-	return isExported(t.Name()) || t.PkgPath() == ""
-}
-
-// ValidateSubscriber func signature
-func ValidateSubscriber(sub interface{}) error {
-	typ := reflect.TypeOf(sub)
-	var argType reflect.Type
-	switch typ.Kind() {
-	case reflect.Func:
-		name := "Func"
-		switch typ.NumIn() {
-		case 1: // func(Message) error
-
-		case 2: // func(context.Context, Message) error or func(context.Context, []Message) error
-			argType = typ.In(2)
-			// if sub.Options().Batch {
-			if argType.Kind() != reflect.Slice {
-				return fmt.Errorf("subscriber %v dont have required signature %s", name, batchSubSig)
-			}
-			if strings.Compare(fmt.Sprintf("%v", argType), "[]interface{}") == 0 {
-				return fmt.Errorf("subscriber %v dont have required signaure %s", name, batchSubSig)
-			}
-		//	}
-		default:
-			return fmt.Errorf("subscriber %v takes wrong number of args: %v required signature %s or %s", name, typ.NumIn(), subSig, batchSubSig)
-		}
-		if !isExportedOrBuiltinType(argType) {
-			return fmt.Errorf("subscriber %v argument type not exported: %v", name, argType)
-		}
-		if typ.NumOut() != 1 {
-			return fmt.Errorf("subscriber %v has wrong number of return values: %v require signature %s or %s",
-				name, typ.NumOut(), subSig, batchSubSig)
-		}
-		if returnType := typ.Out(0); returnType != typeOfError {
-			return fmt.Errorf("subscriber %v returns %v not error", name, returnType.String())
-		}
-	default:
-		hdlr := reflect.ValueOf(sub)
-		name := reflect.Indirect(hdlr).Type().Name()
-
-		for m := 0; m < typ.NumMethod(); m++ {
-			method := typ.Method(m)
-			switch method.Type.NumIn() {
-			case 3:
-				argType = method.Type.In(2)
-			default:
-				return fmt.Errorf("subscriber %v.%v takes wrong number of args: %v required signature %s or %s",
-					name, method.Name, method.Type.NumIn(), subSig, batchSubSig)
-			}
-
-			if !isExportedOrBuiltinType(argType) {
-				return fmt.Errorf("%v argument type not exported: %v", name, argType)
-			}
-			if method.Type.NumOut() != 1 {
-				return fmt.Errorf(
-					"subscriber %v.%v has wrong number of return values: %v require signature %s or %s",
-					name, method.Name, method.Type.NumOut(), subSig, batchSubSig)
-			}
-			if returnType := method.Type.Out(0); returnType != typeOfError {
-				return fmt.Errorf("subscriber %v.%v returns %v not error", name, method.Name, returnType.String())
-			}
-		}
-	}
-
-	return nil
-}

build/build.go

@@ -0,0 +1,32 @@
+// Package build is for building source into a package
+package build
+
+// Build is an interface for building packages
+type Build interface {
+	// Package builds a package
+	Package(name string, src *Source) (*Package, error)
+	// Remove removes the package
+	Remove(*Package) error
+}
+
+// Source is the source of a build
+type Source struct {
+	// Path to the source if local
+	Path string
+	// Language is the language of code
+	Language string
+	// Location of the source
+	Repository string
+}
+
+// Package is packaged format for source
+type Package struct {
+	// Source of the package
+	Source *Source
+	// Name of the package
+	Name string
+	// Location of the package
+	Path string
+	// Type of package e.g tarball, binary, docker
+	Type string
+}

build/options.go

@@ -0,0 +1,17 @@
+package build
+
+// Options struct
+type Options struct {
+	// local path to download source
+	Path string
+}
+
+// Option func
+type Option func(o *Options)
+
+// Path is the Local path for repository
+func Path(p string) Option {
+	return func(o *Options) {
+		o.Path = p
+	}
+}

client/backoff.go

@@ -2,29 +2,14 @@ package client
 
 import (
 	"context"
-	"math"
 	"time"
 
-	"go.unistack.org/micro/v4/util/backoff"
+	"github.com/unistack-org/micro/v3/util/backoff"
 )
 
 // BackoffFunc is the backoff call func
 type BackoffFunc func(ctx context.Context, req Request, attempts int) (time.Duration, error)
 
-// BackoffExp using exponential backoff func
+func exponentialBackoff(ctx context.Context, req Request, attempts int) (time.Duration, error) {
-func BackoffExp(_ context.Context, _ Request, attempts int) (time.Duration, error) {
 	return backoff.Do(attempts), nil
 }
-
-// BackoffInterval specifies randomization interval for backoff func
-func BackoffInterval(min time.Duration, max 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 < min {
-			return min, nil
-		} else if td > max {
-			return max, nil
-		}
-		return td, nil
-	}
-}

client/backoff_test.go

@@ -6,7 +6,7 @@ import (
 	"time"
 )
 
-func TestBackoffExp(t *testing.T) {
+func TestBackoff(t *testing.T) {
 	results := []time.Duration{
 		0 * time.Second,
 		100 * time.Millisecond,
@@ -22,7 +22,7 @@ func TestBackoffExp(t *testing.T) {
 	}
 
 	for i := 0; i < 5; i++ {
-		d, err := BackoffExp(context.TODO(), r, i)
+		d, err := exponentialBackoff(context.TODO(), r, i)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -32,25 +32,3 @@ func TestBackoffExp(t *testing.T) {
 		}
 	}
 }
-
-func TestBackoffInterval(t *testing.T) {
-	min := 100 * time.Millisecond
-	max := 300 * time.Millisecond
-
-	r := &testRequest{
-		service: "test",
-		method:  "test",
-	}
-
-	fn := BackoffInterval(min, max)
-	for i := 0; i < 5; i++ {
-		d, err := fn(context.TODO(), r, i)
-		if err != nil {
-			t.Fatal(err)
-		}
-
-		if d < min || d > max {
-			t.Fatalf("Expected %v < %v < %v", min, d, max)
-		}
-	}
-}

client/client.go

@@ -1,29 +1,27 @@
 // Package client is an interface for an RPC client
-package client // import "go.unistack.org/micro/v4/client"
+package client
 
 import (
 	"context"
 	"time"
 
-	"go.unistack.org/micro/v4/codec"
+	"github.com/unistack-org/micro/v3/codec"
-	"go.unistack.org/micro/v4/options"
+	"github.com/unistack-org/micro/v3/metadata"
 )
 
 var (
 	// DefaultClient is the global default client
-	DefaultClient = NewClient()
+	DefaultClient Client = NewClient()
 	// DefaultContentType is the default content-type if not specified
-	DefaultContentType = ""
+	DefaultContentType = "application/json"
-	// DefaultBackoff is the default backoff function for retries (minimum 10 millisecond and maximum 5 second)
+	// DefaultBackoff is the default backoff function for retries
-	DefaultBackoff = BackoffInterval(10*time.Millisecond, 5*time.Second)
+	DefaultBackoff = exponentialBackoff
 	// 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
-	// DefaultDialTimeout the default dial timeout
-	DefaultDialTimeout = time.Second * 5
 	// DefaultPoolSize sets the connection pool size
 	DefaultPoolSize = 100
 	// DefaultPoolTTL sets the connection pool ttl
@@ -35,14 +33,23 @@ var (
 // It also supports bidirectional streaming of requests.
 type Client interface {
 	Name() string
-	Init(opts ...options.Option) error
+	Init(opts ...Option) error
 	Options() Options
-	NewRequest(service string, endpoint string, req interface{}, opts ...options.Option) Request
+	NewMessage(topic string, msg interface{}, opts ...MessageOption) Message
-	Call(ctx context.Context, req Request, rsp interface{}, opts ...options.Option) error
+	NewRequest(service string, endpoint string, req interface{}, opts ...RequestOption) Request
-	Stream(ctx context.Context, req Request, opts ...options.Option) (Stream, error)
+	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
 }
 
+// Message is the interface for publishing asynchronously
+type Message interface {
+	Topic() string
+	Payload() interface{}
+	ContentType() string
+}
+
 // Request is the interface for a synchronous request used by Call or Stream
 type Request interface {
 	// The service to call
@@ -59,22 +66,16 @@ type Request interface {
 	Codec() codec.Codec
 	// indicates whether the request will be a streaming one rather than unary
 	Stream() bool
-	// Header data
-	// Header() metadata.Metadata
 }
 
 // Response is the response received from a service
 type Response interface {
 	// Read the response
 	Codec() codec.Codec
-	// The content type
+	// read the header
-	// ContentType() string
+	Header() metadata.Metadata
-	// Header data
-	// Header() metadata.Metadata
 	// Read the undecoded response
 	Read() ([]byte, error)
-	// The unencoded request body
-	// Body() interface{}
 }
 
 // Stream is the interface for a bidirectional synchronous stream
@@ -89,14 +90,23 @@ type Stream interface {
 	Send(msg interface{}) error
 	// Recv will decode and read a response
 	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
+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)

client/client_call_options.go

@@ -2,24 +2,22 @@ package client
 
 import (
 	"context"
-
-	"go.unistack.org/micro/v4/options"
 )
 
 type clientCallOptions struct {
 	Client
-	opts []options.Option
+	opts []CallOption
 }
 
-func (s *clientCallOptions) Call(ctx context.Context, req Request, rsp interface{}, opts ...options.Option) error {
+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 ...options.Option) (Stream, error) {
+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 ...options.Option) Client {
+func NewClientCallOptions(c Client, opts ...CallOption) Client {
 	return &clientCallOptions{c, opts}
 }

client/client_call_options_test.go

@@ -1,28 +0,0 @@
-package client
-
-import (
-	"context"
-	"testing"
-	"time"
-
-	"go.unistack.org/micro/v4/options"
-)
-
-func TestNewClientCallOptions(t *testing.T) {
-	var flag bool
-	w := func(fn CallFunc) CallFunc {
-		flag = true
-		return fn
-	}
-	c := NewClientCallOptions(NewClient(),
-		options.Address("127.0.0.1"),
-		WithCallWrapper(w),
-		RequestTimeout(1*time.Millisecond),
-		Retries(0),
-		Backoff(BackoffInterval(10*time.Millisecond, 100*time.Millisecond)),
-	)
-	_ = c.Call(context.TODO(), c.NewRequest("service", "endpoint", nil), nil)
-	if !flag {
-		t.Fatalf("NewClientCallOptions not works")
-	}
-}

client/context.go

@@ -22,3 +22,33 @@ func NewContext(ctx context.Context, c Client) context.Context {
 	}
 	return context.WithValue(ctx, clientKey{}, c)
 }
+
+// SetPublishOption returns a function to setup a context with given value
+func SetPublishOption(k, v interface{}) PublishOption {
+	return func(o *PublishOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}
+
+// 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

@@ -1,40 +0,0 @@
-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")
-	}
-}

client/lookup.go

@@ -4,15 +4,15 @@ import (
 	"context"
 	"sort"
 
-	"go.unistack.org/micro/v4/errors"
+	"github.com/unistack-org/micro/v3/errors"
-	"go.unistack.org/micro/v4/router"
+	"github.com/unistack-org/micro/v3/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) {
+func LookupRoute(ctx 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

client/noop.go

@@ -2,15 +2,11 @@ package client
 
 import (
 	"context"
-	"fmt"
-	"time"
 
-	"go.unistack.org/micro/v4/codec"
+	"github.com/unistack-org/micro/v3/broker"
-	"go.unistack.org/micro/v4/errors"
+	"github.com/unistack-org/micro/v3/codec"
-	"go.unistack.org/micro/v4/metadata"
+	"github.com/unistack-org/micro/v3/errors"
-	"go.unistack.org/micro/v4/options"
+	"github.com/unistack-org/micro/v3/metadata"
-	"go.unistack.org/micro/v4/selector"
-	"go.unistack.org/micro/v4/semconv"
 )
 
 // DefaultCodecs will be used to encode/decode data
@@ -22,6 +18,12 @@ type noopClient struct {
 	opts Options
 }
 
+type noopMessage struct {
+	topic   string
+	payload interface{}
+	opts    MessageOptions
+}
+
 type noopRequest struct {
 	body        interface{}
 	codec       codec.Codec
@@ -33,12 +35,16 @@ type noopRequest struct {
 }
 
 // NewClient returns new noop client
-func NewClient(opts ...options.Option) Client {
+func NewClient(opts ...Option) Client {
 	nc := &noopClient{opts: NewOptions(opts...)}
 	// wrap in reverse
 
 	c := Client(nc)
 
+	for i := len(nc.opts.Wrappers); i > 0; i-- {
+		c = nc.opts.Wrappers[i-1](c)
+	}
+
 	return c
 }
 
@@ -113,14 +119,6 @@ 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 nil
 }
@@ -129,8 +127,16 @@ func (n *noopStream) Close() error {
 	return nil
 }
 
-func (n *noopStream) CloseSend() error {
+func (n *noopMessage) Topic() string {
-	return nil
+	return n.topic
+}
+
+func (n *noopMessage) Payload() interface{} {
+	return n.payload
+}
+
+func (n *noopMessage) ContentType() string {
+	return n.opts.ContentType
 }
 
 func (n *noopClient) newCodec(contentType string) (codec.Codec, error) {
@@ -143,7 +149,7 @@ func (n *noopClient) newCodec(contentType string) (codec.Codec, error) {
 	return nil, codec.ErrUnknownContentType
 }
 
-func (n *noopClient) Init(opts ...options.Option) error {
+func (n *noopClient) Init(opts ...Option) error {
 	for _, o := range opts {
 		o(&n.opts)
 	}
@@ -158,307 +164,65 @@ func (n *noopClient) String() string {
 	return "noop"
 }
 
-func (n *noopClient) Call(ctx context.Context, req Request, rsp interface{}, opts ...options.Option) error {
+func (n *noopClient) Call(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 := RequestTimeout(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 := n.call
-
-	// wrap the call in reverse
-	for i := len(callOpts.CallWrappers); i > 0; i-- {
-		hcall = callOpts.CallWrappers[i-1](hcall)
-	}
-
-	// 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", err.Error())
-		}
-
-		// 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", err.Error())
-			}
-
-			// 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
-
-	ts := time.Now()
-	endpoint := fmt.Sprintf("%s.%s", req.Service(), req.Endpoint())
-	n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", endpoint).Inc()
-	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)
+func (n *noopClient) NewRequest(service, endpoint string, req interface{}, opts ...RequestOption) Request {
-			if rerr != nil {
-				return rerr
-			}
-
-			if !retry {
-				return err
-			}
-
-			gerr = err
-		}
-	}
-
-	if gerr != nil {
-		n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", endpoint, "status", "failure").Inc()
-	} else {
-		n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", endpoint, "status", "success").Inc()
-	}
-	n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", endpoint).Dec()
-	te := time.Since(ts)
-	n.opts.Meter.Summary(semconv.ClientRequestLatencyMicroseconds, "endpoint", endpoint).Update(te.Seconds())
-	n.opts.Meter.Histogram(semconv.ClientRequestDurationSeconds, "endpoint", endpoint).Update(te.Seconds())
-
-	return gerr
-}
-
-func (n *noopClient) call(ctx context.Context, addr string, req Request, rsp interface{}, opts CallOptions) error {
-	return nil
-}
-
-func (n *noopClient) NewRequest(service, endpoint string, req interface{}, opts ...options.Option) Request {
 	return &noopRequest{service: service, endpoint: endpoint}
 }
 
-func (n *noopClient) Stream(ctx context.Context, req Request, opts ...options.Option) (Stream, error) {
+func (n *noopClient) NewMessage(topic string, msg interface{}, opts ...MessageOption) Message {
-	var err error
+	options := NewMessageOptions(opts...)
-
+	return &noopMessage{topic: topic, payload: msg, opts: options}
-	// make a copy of call opts
-	callOpts := n.opts.CallOptions
-	for _, o := range opts {
-		o(&callOpts)
 }
 
-	// check if we already have a deadline
+func (n *noopClient) Stream(ctx context.Context, req Request, opts ...CallOption) (Stream, error) {
-	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 := StreamTimeout(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", cerr.Error())
-		}
-
-		// 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", err.Error())
-			}
-
-			// balance the list of nodes
-			next, err = callOpts.Selector.Select(routes)
-			if err != nil {
-				return nil, err
-			}
-		}
-
-		node := next()
-
-		// ts := time.Now()
-		endpoint := fmt.Sprintf("%s.%s", req.Service(), req.Endpoint())
-		n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", endpoint).Inc()
-		stream, cerr := n.stream(ctx, node, req, callOpts)
-		if cerr != nil {
-			n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", endpoint, "status", "failure").Inc()
-		} else {
-			n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", endpoint, "status", "success").Inc()
-		}
-
-		// 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, addr string, req Request, opts CallOptions) (*noopStream, error) {
 	return &noopStream{}, nil
 }
+
+func (n *noopClient) Publish(ctx context.Context, p Message, opts ...PublishOption) error {
+	var body []byte
+
+	options := NewPublishOptions(opts...)
+
+	md, ok := metadata.FromOutgoingContext(ctx)
+	if !ok {
+		md = metadata.New(0)
+	}
+	md["Content-Type"] = p.ContentType()
+	md["Micro-Topic"] = p.Topic()
+
+	// passed in raw data
+	if d, ok := p.Payload().(*codec.Frame); ok {
+		body = d.Data
+	} else {
+		// use codec for payload
+		cf, err := n.newCodec(p.ContentType())
+		if err != nil {
+			return errors.InternalServerError("go.micro.client", err.Error())
+		}
+
+		// set the body
+		b, err := cf.Marshal(p.Payload())
+		if err != nil {
+			return errors.InternalServerError("go.micro.client", err.Error())
+		}
+		body = b
+	}
+
+	topic := p.Topic()
+
+	// get the exchange
+	if len(options.Exchange) > 0 {
+		topic = options.Exchange
+	}
+
+	return n.opts.Broker.Publish(ctx, topic, &broker.Message{
+		Header: md,
+		Body:   body,
+	},
+		broker.PublishContext(options.Context),
+		broker.PublishBodyOnly(options.BodyOnly),
+	)
+}

client/options.go

@@ -3,18 +3,18 @@ package client
 import (
 	"context"
 	"crypto/tls"
-	"net"
 	"time"
 
-	"go.unistack.org/micro/v4/codec"
+	"github.com/unistack-org/micro/v3/broker"
-	"go.unistack.org/micro/v4/logger"
+	"github.com/unistack-org/micro/v3/codec"
-	"go.unistack.org/micro/v4/metadata"
+	"github.com/unistack-org/micro/v3/logger"
-	"go.unistack.org/micro/v4/meter"
+	"github.com/unistack-org/micro/v3/meter"
-	"go.unistack.org/micro/v4/options"
+	"github.com/unistack-org/micro/v3/network/transport"
-	"go.unistack.org/micro/v4/router"
+	"github.com/unistack-org/micro/v3/register"
-	"go.unistack.org/micro/v4/selector"
+	"github.com/unistack-org/micro/v3/router"
-	"go.unistack.org/micro/v4/selector/random"
+	"github.com/unistack-org/micro/v3/selector"
-	"go.unistack.org/micro/v4/tracer"
+	"github.com/unistack-org/micro/v3/selector/random"
+	"github.com/unistack-org/micro/v3/tracer"
 )
 
 // Options holds client options
@@ -25,38 +25,40 @@ type Options struct {
 	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
-	// TLSConfig specifies tls.Config for secure connection
+	// Transport used for transfer messages
-	TLSConfig *tls.Config
+	Transport transport.Transport
-	// Codecs map
+	// Context is used for external options
-	Codecs map[string]codec.Codec
+	Context context.Context
 	// Lookup func used to get destination addr
 	Lookup LookupFunc
+	// Codecs map
+	Codecs map[string]codec.Codec
+	// TLSConfig specifies tls.Config for secure connection
+	TLSConfig *tls.Config
 	// Proxy is used for proxy requests
 	Proxy string
 	// ContentType is used to select codec
 	ContentType string
 	// Name is the client name
 	Name string
+	// Wrappers contains wrappers
+	Wrappers []Wrapper
 	// CallOptions contains default CallOptions
 	CallOptions CallOptions
 	// PoolSize connection pool size
 	PoolSize int
 	// PoolTTL connection pool ttl
 	PoolTTL time.Duration
-	// ContextDialer used to connect
-	ContextDialer func(context.Context, string) (net.Conn, error)
-	// Hooks may contains Client func wrapper
-	Hooks options.Hooks
 }
 
 // NewCallOptions creates new call options struct
-func NewCallOptions(opts ...options.Option) CallOptions {
+func NewCallOptions(opts ...CallOption) CallOptions {
 	options := CallOptions{}
 	for _, o := range opts {
 		o(&options)
@@ -66,12 +68,12 @@ func NewCallOptions(opts ...options.Option) CallOptions {
 
 // CallOptions holds client call options
 type CallOptions struct {
+	// Router used for route
+	Router router.Router
 	// 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
 	Retry RetryFunc
 	// Backoff func used for backoff when retry
@@ -80,39 +82,67 @@ type CallOptions struct {
 	Network string
 	// Content-Type
 	ContentType string
-	// AuthToken string
-	AuthToken string
-	// Address specifies static addr list
-	Address []string
-	// SelectOptions selector options
-	SelectOptions []selector.SelectOption
 	// CallWrappers call wrappers
 	CallWrappers []CallWrapper
+	// SelectOptions selector options
+	SelectOptions []selector.SelectOption
+	// Address specifies static addr list
+	Address []string
+	// Retries specifies retries num
+	Retries int
 	// StreamTimeout stream timeout
 	StreamTimeout time.Duration
 	// RequestTimeout request timeout
 	RequestTimeout time.Duration
-	// RequestMetadata holds additional metadata for call
-	RequestMetadata metadata.Metadata
-	// ResponseMetadata holds additional metadata from call
-	ResponseMetadata *metadata.Metadata
 	// DialTimeout dial timeout
 	DialTimeout time.Duration
-	// Retries specifies retries num
+	// AuthToken flag
-	Retries int
+	AuthToken bool
-	// ContextDialer used to connect
-	ContextDialer func(context.Context, string) (net.Conn, error)
 }
 
-// ContextDialer pass ContextDialer to client
+// Context pass context to client
-func ContextDialer(fn func(context.Context, string) (net.Conn, error)) options.Option {
+func Context(ctx context.Context) Option {
-	return func(src interface{}) error {
+	return func(o *Options) {
-		return options.Set(src, fn, ".ContextDialer")
+		o.Context = ctx
 	}
 }
 
+// NewPublishOptions create new PublishOptions struct from option
+func NewPublishOptions(opts ...PublishOption) PublishOptions {
+	options := PublishOptions{}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}
+
+// PublishOptions holds publish options
+type PublishOptions struct {
+	// BodyOnly will publish only message body
+	BodyOnly bool
+	// Context used for external options
+	Context context.Context
+	// Exchange topic exchange name
+	Exchange string
+}
+
+// NewMessageOptions creates message options struct
+func NewMessageOptions(opts ...MessageOption) MessageOptions {
+	options := MessageOptions{}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}
+
+// MessageOptions holds client message options
+type MessageOptions struct {
+	// ContentType specify content-type of message
+	ContentType string
+}
+
 // NewRequestOptions creates new RequestOptions struct
-func NewRequestOptions(opts ...options.Option) RequestOptions {
+func NewRequestOptions(opts ...RequestOption) RequestOptions {
 	options := RequestOptions{}
 	for _, o := range opts {
 		o(&options)
@@ -131,7 +161,7 @@ type RequestOptions struct {
 }
 
 // NewOptions creates new options struct
-func NewOptions(opts ...options.Option) Options {
+func NewOptions(opts ...Option) Options {
 	options := Options{
 		Context:     context.Background(),
 		ContentType: DefaultContentType,
@@ -142,16 +172,18 @@ func NewOptions(opts ...options.Option) Options {
 			Retry:          DefaultRetry,
 			Retries:        DefaultRetries,
 			RequestTimeout: DefaultRequestTimeout,
-			DialTimeout:    DefaultDialTimeout,
+			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,
+		Transport: transport.DefaultTransport,
 	}
 
 	for _, o := range opts {
@@ -161,131 +193,327 @@ func NewOptions(opts ...options.Option) Options {
 	return options
 }
 
+// Broker to be used for pub/sub
+func Broker(b broker.Broker) Option {
+	return func(o *Options) {
+		o.Broker = b
+	}
+}
+
+// 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.Codec) Option {
+	return func(o *Options) {
+		o.Codecs[contentType] = c
+	}
+}
+
+// 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) options.Option {
+func Proxy(addr string) Option {
-	return func(src interface{}) error {
+	return func(o *Options) {
-		return options.Set(src, addr, ".Proxy")
+		o.Proxy = addr
 	}
 }
 
 // PoolSize sets the connection pool size
-func PoolSize(d int) options.Option {
+func PoolSize(d int) Option {
-	return func(src interface{}) error {
+	return func(o *Options) {
-		return options.Set(src, d, ".PoolSize")
+		o.PoolSize = d
 	}
 }
 
 // PoolTTL sets the connection pool ttl
-func PoolTTL(td time.Duration) options.Option {
+func PoolTTL(d time.Duration) Option {
-	return func(src interface{}) error {
+	return func(o *Options) {
-		return options.Set(src, td, ".PoolTTL")
+		o.PoolTTL = d
+	}
+}
+
+// Transport to use for communication e.g http, rabbitmq, etc
+func Transport(t transport.Transport) Option {
+	return func(o *Options) {
+		o.Transport = t
+	}
+}
+
+// Register sets the routers register
+func Register(r register.Register) Option {
+	return func(o *Options) {
+		if o.Router != nil {
+			o.Router.Init(router.Register(r))
+		}
+	}
+}
+
+// Router is used to lookup routes for a service
+func Router(r router.Router) Option {
+	return func(o *Options) {
+		o.Router = r
 	}
 }
 
 // Selector is used to select a route
-func Selector(s selector.Selector) options.Option {
+func Selector(s selector.Selector) Option {
-	return func(src interface{}) error {
+	return func(o *Options) {
-		return options.Set(src, s, ".Selector")
+		o.Selector = s
+	}
+}
+
+// Wrap adds a wrapper to the list of options passed into the client
+func Wrap(w Wrapper) Option {
+	return func(o *Options) {
+		o.Wrappers = append(o.Wrappers, w)
+	}
+}
+
+// WrapCall 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
-func Backoff(fn BackoffFunc) options.Option {
+func Backoff(fn BackoffFunc) Option {
-	return func(src interface{}) error {
+	return func(o *Options) {
-		return options.Set(src, fn, ".Backoff")
+		o.CallOptions.Backoff = fn
+	}
+}
+
+// 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(fn LookupFunc) options.Option {
+func Lookup(l LookupFunc) Option {
-	return func(src interface{}) error {
+	return func(o *Options) {
-		return options.Set(src, fn, ".Lookup")
+		o.Lookup = l
 	}
 }
 
-// WithCallWrapper sets the retry function to be used when re-trying.
+// TLSConfig specifies a *tls.Config
-func WithCallWrapper(fn CallWrapper) options.Option {
+func TLSConfig(t *tls.Config) Option {
-	return func(src interface{}) error {
+	return func(o *Options) {
-		return options.Set(src, fn, ".CallWrappers")
+		// set the internal tls
+		o.TLSConfig = t
+
+		// set the default transport if one is not
+		// already set. Required for Init call below.
+
+		// set the transport tls
+		o.Transport.Init(
+			transport.TLSConfig(t),
+		)
 	}
 }
 
 // Retries sets the retry count when making the request.
-func Retries(n int) options.Option {
+func Retries(i int) Option {
-	return func(src interface{}) error {
+	return func(o *Options) {
-		return options.Set(src, n, ".Retries")
+		o.CallOptions.Retries = i
 	}
 }
 
 // Retry sets the retry function to be used when re-trying.
-func Retry(fn RetryFunc) options.Option {
+func Retry(fn RetryFunc) Option {
-	return func(src interface{}) error {
+	return func(o *Options) {
-		return options.Set(src, fn, ".Retry")
+		o.CallOptions.Retry = fn
 	}
 }
 
 // RequestTimeout is the request timeout.
-func RequestTimeout(td time.Duration) options.Option {
+func RequestTimeout(d time.Duration) Option {
-	return func(src interface{}) error {
+	return func(o *Options) {
-		return options.Set(src, td, ".RequestTimeout")
+		o.CallOptions.RequestTimeout = d
 	}
 }
 
 // StreamTimeout sets the stream timeout
-func StreamTimeout(td time.Duration) options.Option {
+func StreamTimeout(d time.Duration) Option {
-	return func(src interface{}) error {
+	return func(o *Options) {
-		return options.Set(src, td, ".StreamTimeout")
+		o.CallOptions.StreamTimeout = d
 	}
 }
 
 // DialTimeout sets the dial timeout
-func DialTimeout(td time.Duration) options.Option {
+func DialTimeout(d time.Duration) Option {
-	return func(src interface{}) error {
+	return func(o *Options) {
-		return options.Set(src, td, ".DialTimeout")
+		o.CallOptions.DialTimeout = d
 	}
 }
 
-// WithResponseMetadata is a CallOption which adds metadata.Metadata to Options.CallOptions
+// WithExchange sets the exchange to route a message through
-func ResponseMetadata(md *metadata.Metadata) options.Option {
+func WithExchange(e string) PublishOption {
-	return func(src interface{}) error {
+	return func(o *PublishOptions) {
-		return options.Set(src, md, ".ResponseMetadata")
+		o.Exchange = e
 	}
 }
 
-// WithRequestMetadata is a CallOption which adds metadata.Metadata to Options.CallOptions
+// WithBodyOnly publish only message body
-func RequestMetadata(md metadata.Metadata) options.Option {
+func WithBodyOnly(b bool) PublishOption {
-	return func(src interface{}) error {
+	return func(o *PublishOptions) {
-		return options.Set(src, metadata.Copy(md), ".RequestMetadata")
+		o.BodyOnly = b
 	}
 }
 
-// AuthToken is a CallOption which overrides the
+// PublishContext sets the context in publish options
+func PublishContext(ctx context.Context) PublishOption {
+	return func(o *PublishOptions) {
+		o.Context = ctx
+	}
+}
+
+// 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
+	}
+}
+
+// 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 {
+	return func(o *CallOptions) {
+		o.Backoff = fn
+	}
+}
+
+// WithRetry is a CallOption which overrides that which
+// set in Options.CallOptions
+func WithRetry(fn RetryFunc) CallOption {
+	return func(o *CallOptions) {
+		o.Retry = fn
+	}
+}
+
+// WithRetries is a CallOption which overrides that which
+// set in Options.CallOptions
+func WithRetries(i int) CallOption {
+	return func(o *CallOptions) {
+		o.Retries = i
+	}
+}
+
+// WithRequestTimeout is a CallOption which overrides that which
+// set in Options.CallOptions
+func WithRequestTimeout(d time.Duration) CallOption {
+	return func(o *CallOptions) {
+		o.RequestTimeout = d
+	}
+}
+
+// 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 {
+	return func(o *CallOptions) {
+		o.DialTimeout = d
+	}
+}
+
+// WithAuthToken is a CallOption which overrides the
 // authorization header with the services own auth token
-func AuthToken(t string) options.Option {
+func WithAuthToken() CallOption {
-	return func(src interface{}) error {
+	return func(o *CallOptions) {
-		return options.Set(src, t, ".AuthToken")
+		o.AuthToken = true
 	}
 }
 
-// Network is a CallOption which sets the network attribute
+// WithNetwork is a CallOption which sets the network attribute
-func Network(n string) options.Option {
+func WithNetwork(n string) CallOption {
-	return func(src interface{}) error {
+	return func(o *CallOptions) {
-		return options.Set(src, n, ".Network")
+		o.Network = n
+	}
+}
+
+// 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) options.Option {
+func WithSelectOptions(sops ...selector.SelectOption) CallOption {
 	return func(o *CallOptions) {
 		o.SelectOptions = sops
 	}
 }
-*/
+
+// WithMessageContentType sets the message content type
+func WithMessageContentType(ct string) MessageOption {
+	return func(o *MessageOptions) {
+		o.ContentType = ct
+	}
+}
 
 // StreamingRequest specifies that request is streaming
-func StreamingRequest(b bool) options.Option {
+func StreamingRequest(b bool) RequestOption {
-	return func(src interface{}) error {
+	return func(o *RequestOptions) {
-		return options.Set(src, b, ".Stream")
+		o.Stream = b
+	}
+}
+
+// RequestContentType specifies request content type
+func RequestContentType(ct string) RequestOption {
+	return func(o *RequestOptions) {
+		o.ContentType = ct
 	}
 }

client/retry.go

@@ -3,7 +3,7 @@ package client
 import (
 	"context"
 
-	"go.unistack.org/micro/v4/errors"
+	"github.com/unistack-org/micro/v3/errors"
 )
 
 // RetryFunc that returning either false or a non-nil error will result in the call not being retried
@@ -19,32 +19,18 @@ func RetryNever(ctx context.Context, req Request, retryCount int, err error) (bo
 	return false, nil
 }
 
-// RetryOnError retries a request on a 500 or 408 (timeout) error
+// RetryOnError retries a request on a 500 or timeout error
-func RetryOnError(_ context.Context, _ Request, _ int, err error) (bool, error) {
+func RetryOnError(ctx context.Context, req Request, retryCount int, err error) (bool, error) {
 	if err == nil {
 		return false, nil
 	}
+
 	me := errors.FromError(err)
 	switch me.Code {
 	// retry on timeout or internal server error
 	case 408, 500:
 		return true, nil
 	}
-	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

@@ -1,70 +0,0 @@
-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/test_request.go

@@ -1,7 +1,7 @@
 package client
 
 import (
-	"go.unistack.org/micro/v4/codec"
+	"github.com/unistack-org/micro/v3/codec"
 )
 
 type testRequest struct {

codec/codec.go

@@ -1,11 +1,11 @@
 // Package codec is an interface for encoding messages
-package codec // import "go.unistack.org/micro/v4/codec"
+package codec
 
 import (
 	"errors"
 	"io"
 
-	"go.unistack.org/micro/v4/metadata"
+	"github.com/unistack-org/micro/v3/metadata"
 )
 
 // Message types
@@ -25,9 +25,9 @@ var (
 
 var (
 	// DefaultMaxMsgSize specifies how much data codec can handle
-	DefaultMaxMsgSize = 1024 * 1024 * 4 // 4Mb
+	DefaultMaxMsgSize int = 1024 * 1024 * 4 // 4Mb
 	// DefaultCodec is the global default codec
-	DefaultCodec = NewCodec()
+	DefaultCodec Codec = NewCodec()
 	// DefaultTagName specifies struct tag name to control codec Marshal/Unmarshal
 	DefaultTagName = "codec"
 )
@@ -41,11 +41,11 @@ type MessageType int
 // connection. ReadBody may be called with a nil argument to force the
 // body to be read and discarded.
 type Codec interface {
-	ReadHeader(r io.Reader, m *Message, mt MessageType) error
+	ReadHeader(io.Reader, *Message, MessageType) error
-	ReadBody(r io.Reader, v interface{}) error
+	ReadBody(io.Reader, interface{}) error
-	Write(w io.Writer, m *Message, v interface{}) error
+	Write(io.Writer, *Message, interface{}) error
-	Marshal(v interface{}, opts ...Option) ([]byte, error)
+	Marshal(interface{}) ([]byte, error)
-	Unmarshal(b []byte, v interface{}, opts ...Option) error
+	Unmarshal([]byte, interface{}) error
 	String() string
 }
 
@@ -58,7 +58,7 @@ type Message struct {
 	Method   string
 	Endpoint string
 	Error    string
-	ID       string
+	Id       string
 	Body     []byte
 	Type     MessageType
 }
@@ -67,41 +67,3 @@ type Message struct {
 func NewMessage(t MessageType) *Message {
 	return &Message{Type: t, Header: metadata.New(0)}
 }
-
-// MarshalAppend calls codec.Marshal(v) and returns the data appended to buf.
-// If codec implements MarshalAppend, that is called instead.
-func MarshalAppend(buf []byte, c Codec, v interface{}, opts ...Option) ([]byte, error) {
-	if nc, ok := c.(interface {
-		MarshalAppend([]byte, interface{}, ...Option) ([]byte, error)
-	}); ok {
-		return nc.MarshalAppend(buf, v, opts...)
-	}
-
-	mbuf, err := c.Marshal(v, opts...)
-	if err != nil {
-		return nil, err
-	}
-
-	return append(buf, mbuf...), nil
-}
-
-// 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
-
-// MarshalJSON returns m as the JSON encoding of m.
-func (m *RawMessage) MarshalJSON() ([]byte, error) {
-	if m == nil {
-		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
-}

codec/context.go

@@ -1,34 +0,0 @@
-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
-}
-
-// 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

@@ -1,35 +0,0 @@
-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

@@ -4,42 +4,3 @@ package codec
 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)
-}
-
-// 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

@@ -1,4 +1,4 @@
-// Copyright 2021-2023 Unistack LLC
+// 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.
@@ -17,7 +17,7 @@ syntax = "proto3";
 package micro.codec;
 
 option cc_enable_arenas = true;
-option go_package = "go.unistack.org/micro/v4/codec;codec";
+option go_package = "github.com/unistack-org/micro/v3/codec;codec";
 option java_multiple_files = true;
 option java_outer_classname = "MicroCodec";
 option java_package = "micro.codec";

codec/noop.go

@@ -5,9 +5,7 @@ import (
 	"io"
 )
 
-type noopCodec struct {
+type noopCodec struct{}
-	opts Options
-}
 
 func (c *noopCodec) ReadHeader(conn io.Reader, m *Message, t MessageType) error {
 	return nil
@@ -71,11 +69,11 @@ func (c *noopCodec) String() string {
 }
 
 // NewCodec returns new noop codec
-func NewCodec(opts ...Option) Codec {
+func NewCodec() Codec {
-	return &noopCodec{opts: NewOptions(opts...)}
+	return &noopCodec{}
 }
 
-func (c *noopCodec) Marshal(v interface{}, opts ...Option) ([]byte, error) {
+func (c *noopCodec) Marshal(v interface{}) ([]byte, error) {
 	if v == nil {
 		return nil, nil
 	}
@@ -98,7 +96,7 @@ func (c *noopCodec) Marshal(v interface{}, opts ...Option) ([]byte, error) {
 	return json.Marshal(v)
 }
 
-func (c *noopCodec) Unmarshal(d []byte, v interface{}, opts ...Option) error {
+func (c *noopCodec) Unmarshal(d []byte, v interface{}) error {
 	if v == nil {
 		return nil
 	}
@@ -106,9 +104,6 @@ func (c *noopCodec) Unmarshal(d []byte, v interface{}, opts ...Option) error {
 	case *string:
 		*ve = string(d)
 		return nil
-	case []byte:
-		copy(ve, d)
-		return nil
 	case *[]byte:
 		*ve = d
 		return nil

codec/noop_test.go

@@ -5,23 +5,9 @@ import (
 	"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
+	rsp := make([]byte, len(req))
 
 	nc := NewCodec()
 	if err := nc.Unmarshal(req, &rsp); err != nil {

codec/options.go

@@ -1,11 +1,9 @@
 package codec
 
 import (
-	"context"
+	"github.com/unistack-org/micro/v3/logger"
-
+	"github.com/unistack-org/micro/v3/meter"
-	"go.unistack.org/micro/v4/logger"
+	"github.com/unistack-org/micro/v3/tracer"
-	"go.unistack.org/micro/v4/meter"
-	"go.unistack.org/micro/v4/tracer"
 )
 
 // Option func
@@ -19,10 +17,6 @@ type Options struct {
 	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
 	// MaxMsgSize specifies max messages size that reads by codec
 	MaxMsgSize int
 }
@@ -34,13 +28,6 @@ func MaxMsgSize(n int) Option {
 	}
 }
 
-// TagName sets the codec tag name in struct
-func TagName(n string) Option {
-	return func(o *Options) {
-		o.TagName = n
-	}
-}
-
 // Logger sets the logger
 func Logger(l logger.Logger) Option {
 	return func(o *Options) {
@@ -65,12 +52,10 @@ func Meter(m meter.Meter) Option {
 // NewOptions returns new options
 func NewOptions(opts ...Option) Options {
 	options := Options{
-		Context:    context.Background(),
 		Logger:     logger.DefaultLogger,
 		Meter:      meter.DefaultMeter,
 		Tracer:     tracer.DefaultTracer,
 		MaxMsgSize: DefaultMaxMsgSize,
-		TagName:    DefaultTagName,
 	}
 
 	for _, o := range opts {

config/config.go

@@ -1,27 +1,13 @@
 // Package config is an interface for dynamic configuration.
-package config // import "go.unistack.org/micro/v4/config"
+package config
 
 import (
 	"context"
 	"errors"
-	"reflect"
-	"time"
-
-	"go.unistack.org/micro/v4/options"
 )
 
-type Validator interface {
-	Validate() error
-}
-
 // DefaultConfig default config
-var DefaultConfig = NewConfig()
+var DefaultConfig Config = NewConfig()
-
-// DefaultWatcherMinInterval default min interval for poll changes
-var DefaultWatcherMinInterval = 5 * time.Second
-
-// DefaultWatcherMaxInterval default max interval for poll changes
-var DefaultWatcherMaxInterval = 9 * time.Second
 
 var (
 	// ErrCodecMissing is returned when codec needed and not specified
@@ -30,8 +16,6 @@ var (
 	ErrInvalidStruct = errors.New("invalid struct specified")
 	// ErrWatcherStopped is returned when source watcher has been stopped
 	ErrWatcherStopped = errors.New("watcher stopped")
-	// ErrWatcherNotImplemented returned when config does not implement watch
-	ErrWatcherNotImplemented = errors.New("watcher not implemented")
 )
 
 // Config is an interface abstraction for dynamic configuration
@@ -39,181 +23,35 @@ type Config interface {
 	// Name returns name of config
 	Name() string
 	// Init the config
-	Init(opts ...options.Option) error
+	Init(opts ...Option) error
 	// Options in the config
 	Options() Options
 	// Load config from sources
-	Load(context.Context, ...options.Option) error
+	Load(context.Context, ...LoadOption) error
 	// Save config to sources
-	Save(context.Context, ...options.Option) error
+	Save(context.Context, ...SaveOption) error
-	// Watch a config for changes
+	// Watch a value for changes
-	Watch(context.Context, ...options.Option) (Watcher, error)
+	//Watch(context.Context) (Watcher, error)
 	// String returns config type name
 	String() string
 }
 
 // Watcher is the config watcher
 type Watcher interface {
-	// Next blocks until update happens or error returned
+	// Next() (, error)
-	Next() (map[string]interface{}, error)
-	// Stop stops watcher
 	Stop() error
 }
 
 // Load loads config from config sources
-func Load(ctx context.Context, cs []Config, opts ...options.Option) error {
+func Load(ctx context.Context, cs ...Config) error {
 	var err error
 	for _, c := range cs {
 		if err = c.Init(); err != nil {
 			return err
 		}
-		if err = c.Load(ctx, opts...); err != nil {
+		if err = c.Load(ctx); err != nil {
 			return err
 		}
 	}
 	return nil
 }
-
-// Validate runs Validate() error func for each struct field
-func Validate(ctx context.Context, cfg interface{}) error {
-	if cfg == nil {
-		return nil
-	}
-
-	if v, ok := cfg.(Validator); ok {
-		if err := v.Validate(); err != nil {
-			return err
-		}
-	}
-
-	sv := reflect.ValueOf(cfg)
-	if sv.Kind() == reflect.Ptr {
-		sv = sv.Elem()
-	}
-	if sv.Kind() != reflect.Struct {
-		return nil
-	}
-
-	typ := sv.Type()
-	for idx := 0; idx < typ.NumField(); idx++ {
-		fld := typ.Field(idx)
-		val := sv.Field(idx)
-		if !val.IsValid() || len(fld.PkgPath) != 0 {
-			continue
-		}
-
-		if v, ok := val.Interface().(Validator); ok {
-			if err := v.Validate(); err != nil {
-				return err
-			}
-		}
-
-		switch val.Kind() {
-		case reflect.Ptr:
-			if reflect.Indirect(val).Kind() == reflect.Struct {
-				if err := Validate(ctx, val.Interface()); err != nil {
-					return err
-				}
-			}
-		case reflect.Struct:
-			if err := Validate(ctx, val.Interface()); err != nil {
-				return err
-			}
-		}
-	}
-
-	return nil
-}
-
-var (
-	// DefaultBeforeLoad default func that runs before config Load
-	DefaultBeforeLoad = func(ctx context.Context, c Config) error {
-		for _, fn := range c.Options().BeforeLoad {
-			if fn == nil {
-				return nil
-			}
-			if err := fn(ctx, c); err != nil {
-				c.Options().Logger.Error(ctx, c.String()+" BeforeLoad error "+err.Error())
-				if !c.Options().AllowFail {
-					return err
-				}
-			}
-		}
-		return nil
-	}
-	// DefaultAfterLoad default func that runs after config Load
-	DefaultAfterLoad = func(ctx context.Context, c Config) error {
-		for _, fn := range c.Options().AfterLoad {
-			if fn == nil {
-				return nil
-			}
-			if err := fn(ctx, c); err != nil {
-				c.Options().Logger.Error(ctx, c.String()+" AfterLoad error "+err.Error())
-				if !c.Options().AllowFail {
-					return err
-				}
-			}
-		}
-		return nil
-	}
-	// DefaultBeforeSave default func that runs befora config Save
-	DefaultBeforeSave = func(ctx context.Context, c Config) error {
-		for _, fn := range c.Options().BeforeSave {
-			if fn == nil {
-				return nil
-			}
-			if err := fn(ctx, c); err != nil {
-				c.Options().Logger.Error(ctx, c.String()+" BeforeSave error "+err.Error())
-				if !c.Options().AllowFail {
-					return err
-				}
-			}
-		}
-		return nil
-	}
-	// DefaultAfterSave default func that runs after config Save
-	DefaultAfterSave = func(ctx context.Context, c Config) error {
-		for _, fn := range c.Options().AfterSave {
-			if fn == nil {
-				return nil
-			}
-			if err := fn(ctx, c); err != nil {
-				c.Options().Logger.Error(ctx, c.String()+" AfterSave error "+err.Error())
-				if !c.Options().AllowFail {
-					return err
-				}
-			}
-		}
-		return nil
-	}
-	// DefaultBeforeInit default func that runs befora config Init
-	DefaultBeforeInit = func(ctx context.Context, c Config) error {
-		for _, fn := range c.Options().BeforeInit {
-			if fn == nil {
-				return nil
-			}
-			if err := fn(ctx, c); err != nil {
-				c.Options().Logger.Error(ctx, c.String()+" BeforeInit error "+err.Error())
-				if !c.Options().AllowFail {
-					return err
-				}
-			}
-		}
-		return nil
-	}
-	// DefaultAfterInit default func that runs after config Init
-	DefaultAfterInit = func(ctx context.Context, c Config) error {
-		for _, fn := range c.Options().AfterSave {
-			if fn == nil {
-				return nil
-			}
-			if err := fn(ctx, c); err != nil {
-				c.Options().Logger.Error(ctx, c.String()+" AfterInit error "+err.Error())
-				if !c.Options().AllowFail {
-					return err
-				}
-			}
-		}
-		return nil
-	}
-)

config/context.go

@@ -22,3 +22,13 @@ func NewContext(ctx context.Context, c Config) context.Context {
 	}
 	return context.WithValue(ctx, configKey{}, 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)
+	}
+}

config/context_test.go

@@ -1,42 +0,0 @@
-package config
-
-import (
-	"context"
-	"testing"
-)
-
-func TestFromNilContext(t *testing.T) {
-	// nolint: staticcheck
-	c, ok := FromContext(nil)
-	if ok || c != nil {
-		t.Fatal("FromContext not works")
-	}
-}
-
-func TestNewNilContext(t *testing.T) {
-	// nolint: staticcheck
-	ctx := NewContext(nil, NewConfig())
-
-	c, ok := FromContext(ctx)
-	if c == nil || !ok {
-		t.Fatal("NewContext not works")
-	}
-}
-
-func TestFromContext(t *testing.T) {
-	ctx := context.WithValue(context.TODO(), configKey{}, NewConfig())
-
-	c, ok := FromContext(ctx)
-	if c == nil || !ok {
-		t.Fatal("FromContext not works")
-	}
-}
-
-func TestNewContext(t *testing.T) {
-	ctx := NewContext(context.TODO(), NewConfig())
-
-	c, ok := FromContext(ctx)
-	if c == nil || !ok {
-		t.Fatal("NewContext not works")
-	}
-}

config/default.go

@@ -5,14 +5,9 @@ import (
 	"reflect"
 	"strconv"
 	"strings"
-	"time"
 
-	"dario.cat/mergo"
+	"github.com/imdario/mergo"
-	"github.com/google/uuid"
+	rutil "github.com/unistack-org/micro/v3/util/reflect"
-	"go.unistack.org/micro/v4/options"
-	mid "go.unistack.org/micro/v4/util/id"
-	rutil "go.unistack.org/micro/v4/util/reflect"
-	mtime "go.unistack.org/micro/v4/util/time"
 )
 
 type defaultConfig struct {
@@ -23,30 +18,19 @@ func (c *defaultConfig) Options() Options {
 	return c.opts
 }
 
-func (c *defaultConfig) Init(opts ...options.Option) error {
+func (c *defaultConfig) Init(opts ...Option) error {
 	for _, o := range opts {
 		o(&c.opts)
 	}
-
-	if err := DefaultBeforeInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
-		return err
-	}
-
-	if err := DefaultAfterInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
-		return err
-	}
-
 	return nil
 }
 
-func (c *defaultConfig) Load(ctx context.Context, opts ...options.Option) error {
+func (c *defaultConfig) Load(ctx context.Context, opts ...LoadOption) error {
-	if c.opts.SkipLoad != nil && c.opts.SkipLoad(ctx, c) {
+	for _, fn := range c.opts.BeforeLoad {
-		return nil
+		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
-	}
-
-	if err := DefaultBeforeLoad(ctx, c); err != nil && !c.opts.AllowFail {
 			return err
 		}
+	}
 
 	options := NewLoadOptions(opts...)
 	mopts := []func(*mergo.Config){mergo.WithTypeCheck}
@@ -57,42 +41,32 @@ func (c *defaultConfig) Load(ctx context.Context, opts ...options.Option) error
 		mopts = append(mopts, mergo.WithAppendSlice)
 	}
 
-	dst := c.opts.Struct
+	src, err := rutil.Zero(c.opts.Struct)
-	if options.Struct != nil {
+	if err == nil {
-		dst = options.Struct
+		valueOf := reflect.ValueOf(src)
+		if err = c.fillValues(valueOf); err == nil {
+			err = mergo.Merge(c.opts.Struct, src, mopts...)
 		}
-
-	src, err := rutil.Zero(dst)
-	if err != nil {
-		if !c.opts.AllowFail {
-			return err
-		}
-		if err = DefaultAfterLoad(ctx, c); err != nil && !c.opts.AllowFail {
-			return err
-		}
-	}
-
-	if err = fillValues(reflect.ValueOf(src), c.opts.StructTag); err == nil {
-		err = mergo.Merge(dst, src, mopts...)
 	}
 
 	if err != nil && !c.opts.AllowFail {
 		return err
 	}
 
-	if err := DefaultAfterLoad(ctx, c); err != nil && !c.opts.AllowFail {
+	for _, fn := range c.opts.AfterLoad {
+		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
 			return err
 		}
+	}
 
 	return nil
 }
 
 //nolint:gocyclo
-func fillValue(value reflect.Value, val string) error {
+func (c *defaultConfig) fillValue(value reflect.Value, val string) error {
 	if !rutil.IsEmpty(value) {
 		return nil
 	}
-
 	switch value.Kind() {
 	case reflect.Map:
 		t := value.Type()
@@ -106,10 +80,10 @@ func fillValue(value reflect.Value, val string) error {
 			kv := strings.FieldsFunc(nval, func(c rune) bool { return c == '=' })
 			mkey := reflect.Indirect(reflect.New(kt))
 			mval := reflect.Indirect(reflect.New(et))
-			if err := fillValue(mkey, kv[0]); err != nil {
+			if err := c.fillValue(mkey, kv[0]); err != nil {
 				return err
 			}
-			if err := fillValue(mval, kv[1]); err != nil {
+			if err := c.fillValue(mval, kv[1]); err != nil {
 				return err
 			}
 			value.SetMapIndex(mkey, mval)
@@ -119,7 +93,7 @@ func fillValue(value reflect.Value, val string) error {
 		value.Set(reflect.MakeSlice(reflect.SliceOf(value.Type().Elem()), len(nvals), len(nvals)))
 		for idx, nval := range nvals {
 			nvalue := reflect.Indirect(reflect.New(value.Type().Elem()))
-			if err := fillValue(nvalue, nval); err != nil {
+			if err := c.fillValue(nvalue, nval); err != nil {
 				return err
 			}
 			value.Index(idx).Set(nvalue)
@@ -131,20 +105,6 @@ func fillValue(value reflect.Value, val string) error {
 		}
 		value.Set(reflect.ValueOf(v))
 	case reflect.String:
-		switch val {
-		case "micro:generate uuid":
-			uid, err := uuid.NewRandom()
-			if err != nil {
-				return err
-			}
-			val = uid.String()
-		case "micro:generate id":
-			uid, err := mid.New()
-			if err != nil {
-				return err
-			}
-			val = uid
-		}
 		value.Set(reflect.ValueOf(val))
 	case reflect.Float32:
 		v, err := strconv.ParseFloat(val, 32)
@@ -183,26 +143,11 @@ func fillValue(value reflect.Value, val string) error {
 		}
 		value.Set(reflect.ValueOf(int32(v)))
 	case reflect.Int64:
-		switch {
-		case value.Type().String() == "time.Duration" && value.Type().PkgPath() == "time":
-			v, err := time.ParseDuration(val)
-			if err != nil {
-				return err
-			}
-			value.Set(reflect.ValueOf(v))
-		case value.Type().String() == "time.Duration" && value.Type().PkgPath() == "go.unistack.org/micro/v4/util/time":
-			v, err := mtime.ParseDuration(val)
-			if err != nil {
-				return err
-			}
-			value.SetInt(int64(v))
-		default:
 		v, err := strconv.ParseInt(val, 10, 64)
 		if err != nil {
 			return err
 		}
 		value.Set(reflect.ValueOf(v))
-		}
 	case reflect.Uint:
 		v, err := strconv.ParseUint(val, 10, 0)
 		if err != nil {
@@ -237,7 +182,7 @@ func fillValue(value reflect.Value, val string) error {
 	return nil
 }
 
-func fillValues(valueOf reflect.Value, tname string) error {
+func (c *defaultConfig) fillValues(valueOf reflect.Value) error {
 	var values reflect.Value
 
 	if valueOf.Kind() == reflect.Ptr {
@@ -264,7 +209,7 @@ func fillValues(valueOf reflect.Value, tname string) error {
 		switch value.Kind() {
 		case reflect.Struct:
 			value.Set(reflect.Indirect(reflect.New(value.Type())))
-			if err := fillValues(value, tname); err != nil {
+			if err := c.fillValues(value); err != nil {
 				return err
 			}
 			continue
@@ -278,17 +223,17 @@ func fillValues(valueOf reflect.Value, tname string) error {
 				value.Set(reflect.New(value.Type().Elem()))
 			}
 			value = value.Elem()
-			if err := fillValues(value, tname); err != nil {
+			if err := c.fillValues(value); err != nil {
 				return err
 			}
 			continue
 		}
-		tag, ok := field.Tag.Lookup(tname)
+		tag, ok := field.Tag.Lookup(c.opts.StructTag)
 		if !ok {
 			continue
 		}
 
-		if err := fillValue(value, tag); err != nil {
+		if err := c.fillValue(value, tag); err != nil {
 			return err
 		}
 	}
@@ -296,18 +241,18 @@ func fillValues(valueOf reflect.Value, tname string) error {
 	return nil
 }
 
-func (c *defaultConfig) Save(ctx context.Context, _ ...options.Option) error {
+func (c *defaultConfig) Save(ctx context.Context, opts ...SaveOption) error {
-	if c.opts.SkipSave != nil && c.opts.SkipSave(ctx, c) {
+	for _, fn := range c.opts.BeforeSave {
-		return nil
+		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
-	}
-
-	if err := DefaultBeforeSave(ctx, c); err != nil {
 			return err
 		}
+	}
 
-	if err := DefaultAfterSave(ctx, c); err != nil {
+	for _, fn := range c.opts.AfterSave {
+		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
 			return err
 		}
+	}
 
 	return nil
 }
@@ -320,12 +265,8 @@ func (c *defaultConfig) Name() string {
 	return c.opts.Name
 }
 
-func (c *defaultConfig) Watch(ctx context.Context, opts ...options.Option) (Watcher, error) {
-	return nil, ErrWatcherNotImplemented
-}
-
 // NewConfig returns new default config source
-func NewConfig(opts ...options.Option) Config {
+func NewConfig(opts ...Option) Config {
 	options := NewOptions(opts...)
 	if len(options.StructTag) == 0 {
 		options.StructTag = "default"

config/default_test.go

@@ -4,61 +4,34 @@ import (
 	"context"
 	"fmt"
 	"testing"
-	"time"
 
-	"go.unistack.org/micro/v4/config"
+	"github.com/unistack-org/micro/v3/config"
-	mid "go.unistack.org/micro/v4/util/id"
-	mtime "go.unistack.org/micro/v4/util/time"
 )
 
-type cfg struct {
+type Cfg struct {
 	StringValue string `default:"string_value"`
 	IgnoreValue string `json:"-"`
-	StructValue    *cfgStructValue
+	StructValue struct {
-	IntValue       int             `default:"99"`
-	DurationValue  time.Duration   `default:"10s"`
-	MDurationValue mtime.Duration  `default:"10s"`
-	MapValue       map[string]bool `default:"key1=true,key2=false"`
-	UUIDValue      string          `default:"micro:generate uuid"`
-	IDValue        string          `default:"micro:generate id"`
-}
-
-type cfgStructValue struct {
 		StringValue string `default:"string_value"`
 	}
-
+	IntValue int `default:"99"`
-func (c *cfg) Validate() error {
-	if c.IntValue != 10 {
-		return fmt.Errorf("invalid IntValue %d != %d", 10, c.IntValue)
-	}
-	if c.MapValue["key1"] != true {
-		return fmt.Errorf("invalid MapValue %t != %t", true, c.MapValue["key1"])
-	}
-	return nil
-}
-
-func (c *cfgStructValue) Validate() error {
-	if c.StringValue != "string_value" {
-		return fmt.Errorf("invalid StringValue %s != %s", "string_value", c.StringValue)
-	}
-	return nil
 }
 
 func TestDefault(t *testing.T) {
 	ctx := context.Background()
-	conf := &cfg{IntValue: 10}
+	conf := &Cfg{IntValue: 10}
-	blfn := func(_ context.Context, c config.Config) error {
+	blfn := func(ctx context.Context, cfg config.Config) error {
-		nconf, ok := c.Options().Struct.(*cfg)
+		nconf, ok := cfg.Options().Struct.(*Cfg)
 		if !ok {
-			return fmt.Errorf("failed to get Struct from options: %v", c.Options())
+			return fmt.Errorf("failed to get Struct from options: %v", cfg.Options())
 		}
 		nconf.StringValue = "before_load"
 		return nil
 	}
-	alfn := func(_ context.Context, c config.Config) error {
+	alfn := func(ctx context.Context, cfg config.Config) error {
-		nconf, ok := c.Options().Struct.(*cfg)
+		nconf, ok := cfg.Options().Struct.(*Cfg)
 		if !ok {
-			return fmt.Errorf("failed to get Struct from options: %v", c.Options())
+			return fmt.Errorf("failed to get Struct from options: %v", cfg.Options())
 		}
 		nconf.StringValue = "after_load"
 		return nil
@@ -74,53 +47,6 @@ func TestDefault(t *testing.T) {
 	if conf.StringValue != "after_load" {
 		t.Fatal("AfterLoad option not working")
 	}
-	if len(conf.MapValue) != 2 {
-		t.Fatalf("map value invalid: %#+v\n", conf.MapValue)
-	}
 
-	if conf.UUIDValue == "" {
+	t.Logf("%#+v\n", conf)
-		t.Fatalf("uuid value empty")
-	} else if len(conf.UUIDValue) != 36 {
-		t.Fatalf("uuid value invalid: %s", conf.UUIDValue)
-	}
-
-	if conf.IDValue == "" {
-		t.Fatalf("id value empty")
-	} else if len(conf.IDValue) != mid.DefaultSize {
-		t.Fatalf("id value invalid: %s", conf.IDValue)
-	}
-	_ = conf
-	// t.Logf("%#+v\n", conf)
-}
-
-func TestValidate(t *testing.T) {
-	ctx := context.Background()
-	conf := &cfg{IntValue: 10}
-	cfg := config.NewConfig(config.Struct(conf))
-	if err := cfg.Init(); err != nil {
-		t.Fatal(err)
-	}
-	if err := cfg.Load(ctx); err != nil {
-		t.Fatal(err)
-	}
-
-	if err := config.Validate(ctx, conf); err != nil {
-		t.Fatal(err)
-	}
-}
-
-func TestString(t *testing.T) {
-	cfg := config.NewConfig()
-	res := cfg.String()
-	if res != "default" {
-		t.Fatalf("string value invalid: %s", res)
-	}
-}
-
-func TestName(t *testing.T) {
-	cfg := config.NewConfig()
-	res := cfg.Name()
-	if res != "" {
-		t.Fatal("name value not empty")
-	}
 }

config/options.go

@@ -2,13 +2,11 @@ package config
 
 import (
 	"context"
-	"time"
 
-	"go.unistack.org/micro/v4/codec"
+	"github.com/unistack-org/micro/v3/codec"
-	"go.unistack.org/micro/v4/logger"
+	"github.com/unistack-org/micro/v3/logger"
-	"go.unistack.org/micro/v4/meter"
+	"github.com/unistack-org/micro/v3/meter"
-	"go.unistack.org/micro/v4/options"
+	"github.com/unistack-org/micro/v3/tracer"
-	"go.unistack.org/micro/v4/tracer"
 )
 
 // Options hold the config options
@@ -29,28 +27,23 @@ type Options struct {
 	Name string
 	// StructTag name
 	StructTag string
-	// BeforeSave contains slice of funcs that runs before Save
+	// BeforeSave contains slice of funcs that runs before save
 	BeforeSave []func(context.Context, Config) error
-	// AfterSave contains slice of funcs that runs after Save
+	// AfterLoad contains slice of funcs that runs after load
-	AfterSave []func(context.Context, Config) error
-	// BeforeLoad contains slice of funcs that runs before Load
-	BeforeLoad []func(context.Context, Config) error
-	// AfterLoad contains slice of funcs that runs after Load
 	AfterLoad []func(context.Context, Config) error
-	// BeforeInit contains slice of funcs that runs before Init
+	// BeforeLoad contains slice of funcs that runs before load
-	BeforeInit []func(context.Context, Config) error
+	BeforeLoad []func(context.Context, Config) error
-	// AfterInit contains slice of funcs that runs after Init
+	// AfterSave contains slice of funcs that runs after save
-	AfterInit []func(context.Context, Config) error
+	AfterSave []func(context.Context, Config) error
 	// AllowFail flag to allow fail in config source
 	AllowFail bool
-	// SkipLoad runs only if condition returns true
-	SkipLoad func(context.Context, Config) bool
-	// SkipSave runs only if condition returns true
-	SkipSave func(context.Context, Config) bool
 }
 
+// Option function signature
+type Option func(o *Options)
+
 // NewOptions new options struct with filed values
-func NewOptions(opts ...options.Option) Options {
+func NewOptions(opts ...Option) Options {
 	options := Options{
 		Logger:  logger.DefaultLogger,
 		Meter:   meter.DefaultMeter,
@@ -64,16 +57,16 @@ func NewOptions(opts ...options.Option) Options {
 	return options
 }
 
+// LoadOption function signature
+type LoadOption func(o *LoadOptions)
+
 // LoadOptions struct
 type LoadOptions struct {
-	Struct   interface{}
-	Context  context.Context
 	Override bool
 	Append   bool
 }
 
-// NewLoadOptions create LoadOptions struct with provided opts
+func NewLoadOptions(opts ...LoadOption) LoadOptions {
-func NewLoadOptions(opts ...options.Option) LoadOptions {
 	options := LoadOptions{}
 	for _, o := range opts {
 		o(&options)
@@ -82,27 +75,27 @@ func NewLoadOptions(opts ...options.Option) LoadOptions {
 }
 
 // LoadOverride override values when load
-func LoadOverride(b bool) options.Option {
+func LoadOverride(b bool) LoadOption {
-	return func(src interface{}) error {
+	return func(o *LoadOptions) {
-		return options.Set(src, b, ".Override")
+		o.Override = b
 	}
 }
 
 // LoadAppend override values when load
-func LoadAppend(b bool) options.Option {
+func LoadAppend(b bool) LoadOption {
-	return func(src interface{}) error {
+	return func(o *LoadOptions) {
-		return options.Set(src, b, ".Append")
+		o.Append = b
 	}
 }
 
+// SaveOption function signature
+type SaveOption func(o *SaveOptions)
+
 // SaveOptions struct
 type SaveOptions struct {
-	Struct  interface{}
-	Context context.Context
 }
 
-// NewSaveOptions fill SaveOptions struct
+func NewSaveOptions(opts ...SaveOption) SaveOptions {
-func NewSaveOptions(opts ...options.Option) SaveOptions {
 	options := SaveOptions{}
 	for _, o := range opts {
 		o(&options)
@@ -111,109 +104,85 @@ func NewSaveOptions(opts ...options.Option) SaveOptions {
 }
 
 // AllowFail allows config source to fail
-func AllowFail(b bool) options.Option {
+func AllowFail(b bool) Option {
-	return func(src interface{}) error {
+	return func(o *Options) {
-		return options.Set(src, b, ".AllowFail")
+		o.AllowFail = b
-	}
-}
-
-// BeforeInit run funcs before config Init
-func BeforeInit(fn ...func(context.Context, Config) error) options.Option {
-	return func(src interface{}) error {
-		return options.Set(src, fn, ".BeforeInit")
-	}
-}
-
-// AfterInit run funcs after config Init
-func AfterInit(fn ...func(context.Context, Config) error) options.Option {
-	return func(src interface{}) error {
-		return options.Set(src, fn, ".AfterInit")
 	}
 }
 
 // BeforeLoad run funcs before config load
-func BeforeLoad(fn ...func(context.Context, Config) error) options.Option {
+func BeforeLoad(fn ...func(context.Context, Config) error) Option {
-	return func(src interface{}) error {
+	return func(o *Options) {
-		return options.Set(src, fn, ".BeforeLoad")
+		o.BeforeLoad = fn
 	}
 }
 
 // AfterLoad run funcs after config load
-func AfterLoad(fn ...func(context.Context, Config) error) options.Option {
+func AfterLoad(fn ...func(context.Context, Config) error) Option {
-	return func(src interface{}) error {
+	return func(o *Options) {
-		return options.Set(src, fn, ".AfterLoad")
+		o.AfterLoad = fn
 	}
 }
 
 // BeforeSave run funcs before save
-func BeforeSave(fn ...func(context.Context, Config) error) options.Option {
+func BeforeSave(fn ...func(context.Context, Config) error) Option {
-	return func(src interface{}) error {
+	return func(o *Options) {
-		return options.Set(src, fn, ".BeforeSave")
+		o.BeforeSave = fn
 	}
 }
 
 // AfterSave run fncs after save
-func AfterSave(fn ...func(context.Context, Config) error) options.Option {
+func AfterSave(fn ...func(context.Context, Config) error) Option {
-	return func(src interface{}) error {
+	return func(o *Options) {
-		return options.Set(src, fn, ".AfterSave")
+		o.AfterSave = fn
+	}
+}
+
+// Context pass context
+func Context(ctx context.Context) Option {
+	return func(o *Options) {
+		o.Context = ctx
+	}
+}
+
+// Codec sets the source codec
+func Codec(c codec.Codec) Option {
+	return func(o *Options) {
+		o.Codec = c
+	}
+}
+
+// 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
 	}
 }
 
 // Struct used as config
-func Struct(v interface{}) options.Option {
+func Struct(v interface{}) Option {
-	return func(src interface{}) error {
+	return func(o *Options) {
-		return options.Set(src, v, ".Struct")
+		o.Struct = v
 	}
 }
 
 // StructTag sets the struct tag that used for filling
-func StructTag(name string) options.Option {
+func StructTag(name string) Option {
-	return func(src interface{}) error {
+	return func(o *Options) {
-		return options.Set(src, name, ".StructTag")
+		o.StructTag = name
 	}
 }
 
-// WatchOptions struuct
+// Name sets the name
-type WatchOptions struct {
+func Name(n string) Option {
-	// Context used by non default options
+	return func(o *Options) {
-	Context context.Context
+		o.Name = n
-	// Struct for filling
-	Struct interface{}
-	// MinInterval specifies the min time.Duration interval for poll changes
-	MinInterval time.Duration
-	// MaxInterval specifies the max time.Duration interval for poll changes
-	MaxInterval time.Duration
-	// Coalesce multiple events to one
-	Coalesce bool
-}
-
-// NewWatchOptions create WatchOptions struct with provided opts
-func NewWatchOptions(opts ...options.Option) WatchOptions {
-	options := WatchOptions{
-		Context:     context.Background(),
-		MinInterval: DefaultWatcherMinInterval,
-		MaxInterval: DefaultWatcherMaxInterval,
-	}
-	for _, o := range opts {
-		o(&options)
-	}
-	return options
-}
-
-// Coalesce controls watch event combining
-func WatchCoalesce(b bool) options.Option {
-	return func(src interface{}) error {
-		return options.Set(src, b, ".Coalesce")
-	}
-}
-
-// WatchInterval specifies min and max time.Duration for pulling changes
-func WatchInterval(min, max time.Duration) options.Option {
-	return func(src interface{}) error {
-		var err error
-		if err = options.Set(src, min, ".MinInterval"); err == nil {
-			err = options.Set(src, max, ".MaxInterval")
-		}
-		return err
 	}
 }

config/reflect_test.go

@@ -0,0 +1,26 @@
+package config_test
+
+import (
+	"testing"
+
+	rutil "github.com/unistack-org/micro/v3/util/reflect"
+)
+
+type Config struct {
+	SubConfig *SubConfig
+	Config    *Config
+	Value     string
+}
+
+type SubConfig struct {
+	Value string
+}
+
+func TestReflect(t *testing.T) {
+	cfg1 := &Config{Value: "cfg1", Config: &Config{Value: "cfg1_1"}, SubConfig: &SubConfig{Value: "cfg1"}}
+	cfg2, err := rutil.Zero(cfg1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Logf("dst: %#+v\n", cfg2)
+}

context_test.go

@@ -1,24 +0,0 @@
-package micro
-
-import (
-	"context"
-	"testing"
-)
-
-func TestFromContext(t *testing.T) {
-	ctx := context.WithValue(context.TODO(), serviceKey{}, NewService())
-
-	c, ok := FromContext(ctx)
-	if c == nil || !ok {
-		t.Fatal("FromContext not works")
-	}
-}
-
-func TestNewContext(t *testing.T) {
-	ctx := NewContext(context.TODO(), NewService())
-
-	c, ok := FromContext(ctx)
-	if c == nil || !ok {
-		t.Fatal("NewContext not works")
-	}
-}

database/dsn.go

@@ -1,159 +0,0 @@
-package database
-
-import (
-	"crypto/tls"
-	"errors"
-	"fmt"
-	"net/url"
-	"strings"
-)
-
-var (
-	ErrInvalidDSNAddr      = errors.New("invalid dsn addr")
-	ErrInvalidDSNUnescaped = errors.New("dsn must be escaped")
-	ErrInvalidDSNNoSlash   = errors.New("dsn must contains slash")
-)
-
-type Config struct {
-	TLSConfig *tls.Config
-	Username  string
-	Password  string
-	Scheme    string
-	Host      string
-	Port      string
-	Database  string
-	Params    []string
-}
-
-func (cfg *Config) FormatDSN() string {
-	var s strings.Builder
-
-	if len(cfg.Scheme) > 0 {
-		s.WriteString(cfg.Scheme + "://")
-	}
-	// [username[:password]@]
-	if len(cfg.Username) > 0 {
-		s.WriteString(cfg.Username)
-		if len(cfg.Password) > 0 {
-			s.WriteByte(':')
-			s.WriteString(url.PathEscape(cfg.Password))
-		}
-		s.WriteByte('@')
-	}
-
-	// [host:port]
-	if len(cfg.Host) > 0 {
-		s.WriteString(cfg.Host)
-		if len(cfg.Port) > 0 {
-			s.WriteByte(':')
-			s.WriteString(cfg.Port)
-		}
-	}
-
-	// /dbname
-	s.WriteByte('/')
-	s.WriteString(url.PathEscape(cfg.Database))
-
-	for i := 0; i < len(cfg.Params); i += 2 {
-		if i == 0 {
-			s.WriteString("?")
-		} else {
-			s.WriteString("&")
-		}
-		s.WriteString(cfg.Params[i])
-		s.WriteString("=")
-		s.WriteString(cfg.Params[i+1])
-	}
-
-	return s.String()
-}
-
-func ParseDSN(dsn string) (*Config, error) {
-	cfg := &Config{}
-
-	// [user[:password]@][net[(addr)]]/dbname[?param1=value1&paramN=valueN]
-	// Find last '/' that goes before dbname
-	foundSlash := false
-	for i := len(dsn) - 1; i >= 0; i-- {
-		if dsn[i] != '/' {
-			continue
-		}
-
-		foundSlash = true
-		var j, k int
-
-		// left part is empty if i <= 0
-		if i > 0 {
-			// Find the first ':' in dsn
-			for j = i; j >= 0; j-- {
-				if dsn[j] == ':' {
-					cfg.Scheme = dsn[0:j]
-				}
-			}
-
-			// [username[:password]@][host]
-			// Find the last '@' in dsn[:i]
-			for j = i; j >= 0; j-- {
-				if dsn[j] == '@' {
-					// username[:password]
-					// Find the second ':' in dsn[:j]
-					for k = 0; k < j; k++ {
-						if dsn[k] == ':' {
-							if cfg.Scheme == dsn[:k] {
-								continue
-							}
-							var err error
-							cfg.Password, err = url.PathUnescape(dsn[k+1 : j])
-							if err != nil {
-								return nil, err
-							}
-							break
-						}
-					}
-					cfg.Username = dsn[len(cfg.Scheme)+3 : k]
-					break
-				}
-			}
-
-			for k = j + 1; k < i; k++ {
-				if dsn[k] == ':' {
-					cfg.Host = dsn[j+1 : k]
-					cfg.Port = dsn[k+1 : i]
-					break
-				}
-			}
-
-		}
-
-		// dbname[?param1=value1&...&paramN=valueN]
-		// Find the first '?' in dsn[i+1:]
-		for j = i + 1; j < len(dsn); j++ {
-			if dsn[j] == '?' {
-				parts := strings.Split(dsn[j+1:], "&")
-				cfg.Params = make([]string, 0, len(parts)*2)
-				for _, p := range parts {
-					k, v, found := strings.Cut(p, "=")
-					if !found {
-						continue
-					}
-					cfg.Params = append(cfg.Params, k, v)
-				}
-
-				break
-			}
-		}
-		var err error
-		dbname := dsn[i+1 : j]
-		if cfg.Database, err = url.PathUnescape(dbname); err != nil {
-			return nil, fmt.Errorf("invalid dbname %q: %w", dbname, err)
-		}
-
-		break
-	}
-
-	if !foundSlash && len(dsn) > 0 {
-		return nil, ErrInvalidDSNNoSlash
-	}
-
-	return cfg, nil
-}

database/dsn_test.go

@@ -1,31 +0,0 @@
-package database
-
-import (
-	"net/url"
-	"testing"
-)
-
-func TestParseDSN(t *testing.T) {
-	cfg, err := ParseDSN("postgres://username:p@ssword#@host:12345/dbname?key1=val2&key2=val2")
-	if err != nil {
-		t.Fatal(err)
-	}
-	if cfg.Password != "p@ssword#" {
-		t.Fatalf("parsing error")
-	}
-}
-
-func TestFormatDSN(t *testing.T) {
-	src := "postgres://username:p@ssword#@host:12345/dbname?key1=val2&key2=val2"
-	cfg, err := ParseDSN(src)
-	if err != nil {
-		t.Fatal(err)
-	}
-	dst, err := url.PathUnescape(cfg.FormatDSN())
-	if err != nil {
-		t.Fatal(err)
-	}
-	if src != dst {
-		t.Fatalf("\n%s\n%s", src, dst)
-	}
-}

errors/errors.go

@@ -1,14 +1,11 @@
 // Package errors provides a way to return detailed information
 // for an RPC request error. The error is normally JSON encoded.
-package errors // import "go.unistack.org/micro/v4/errors"
+package errors
 
 import (
-	"bytes"
 	"encoding/json"
 	"fmt"
 	"net/http"
-	"strconv"
-	"strings"
 )
 
 var (
@@ -40,8 +37,8 @@ var (
 
 // Error type
 type Error struct {
-	// ID holds error id or service, usually someting like my_service or id
+	// Id holds error id or service, usually someting like my_service or uuid
-	ID string
+	Id string
 	// Detail holds some useful details about error
 	Detail string
 	// Status usually holds text of http status
@@ -56,26 +53,10 @@ func (e *Error) Error() string {
 	return string(b)
 }
 
-/*
-// Generator struct holds id of error
-type Generator struct {
-	id string
-}
-
-// Generator can emit new error with static id
-func NewGenerator(id string) *Generator {
-	return &Generator{id: id}
-}
-
-func (g *Generator) BadRequest(format string, args ...interface{}) error {
-	return BadRequest(g.id, format, args...)
-}
-*/
-
 // New generates a custom error
 func New(id, detail string, code int32) error {
 	return &Error{
-		ID:     id,
+		Id:     id,
 		Code:   code,
 		Detail: detail,
 		Status: http.StatusText(int(code)),
@@ -85,130 +66,130 @@ func New(id, detail string, code int32) error {
 // Parse tries to parse a JSON string into an error. If that
 // fails, it will set the given string as the error detail.
 func Parse(err string) *Error {
-	e := &Error{}
+	e := new(Error)
-	nerr := json.Unmarshal([]byte(err), e)
+	errr := json.Unmarshal([]byte(err), e)
-	if nerr != nil {
+	if errr != nil {
 		e.Detail = err
 	}
 	return e
 }
 
 // BadRequest generates a 400 error.
-func BadRequest(id, format string, args ...interface{}) error {
+func BadRequest(id, format string, a ...interface{}) error {
 	return &Error{
-		ID:     id,
+		Id:     id,
 		Code:   400,
-		Detail: fmt.Sprintf(format, args...),
+		Detail: fmt.Sprintf(format, a...),
 		Status: http.StatusText(400),
 	}
 }
 
 // Unauthorized generates a 401 error.
-func Unauthorized(id, format string, args ...interface{}) error {
+func Unauthorized(id, format string, a ...interface{}) error {
 	return &Error{
-		ID:     id,
+		Id:     id,
 		Code:   401,
-		Detail: fmt.Sprintf(format, args...),
+		Detail: fmt.Sprintf(format, a...),
 		Status: http.StatusText(401),
 	}
 }
 
 // Forbidden generates a 403 error.
-func Forbidden(id, format string, args ...interface{}) error {
+func Forbidden(id, format string, a ...interface{}) error {
 	return &Error{
-		ID:     id,
+		Id:     id,
 		Code:   403,
-		Detail: fmt.Sprintf(format, args...),
+		Detail: fmt.Sprintf(format, a...),
 		Status: http.StatusText(403),
 	}
 }
 
 // NotFound generates a 404 error.
-func NotFound(id, format string, args ...interface{}) error {
+func NotFound(id, format string, a ...interface{}) error {
 	return &Error{
-		ID:     id,
+		Id:     id,
 		Code:   404,
-		Detail: fmt.Sprintf(format, args...),
+		Detail: fmt.Sprintf(format, a...),
 		Status: http.StatusText(404),
 	}
 }
 
 // MethodNotAllowed generates a 405 error.
-func MethodNotAllowed(id, format string, args ...interface{}) error {
+func MethodNotAllowed(id, format string, a ...interface{}) error {
 	return &Error{
-		ID:     id,
+		Id:     id,
 		Code:   405,
-		Detail: fmt.Sprintf(format, args...),
+		Detail: fmt.Sprintf(format, a...),
 		Status: http.StatusText(405),
 	}
 }
 
 // Timeout generates a 408 error.
-func Timeout(id, format string, args ...interface{}) error {
+func Timeout(id, format string, a ...interface{}) error {
 	return &Error{
-		ID:     id,
+		Id:     id,
 		Code:   408,
-		Detail: fmt.Sprintf(format, args...),
+		Detail: fmt.Sprintf(format, a...),
 		Status: http.StatusText(408),
 	}
 }
 
 // Conflict generates a 409 error.
-func Conflict(id, format string, args ...interface{}) error {
+func Conflict(id, format string, a ...interface{}) error {
 	return &Error{
-		ID:     id,
+		Id:     id,
 		Code:   409,
-		Detail: fmt.Sprintf(format, args...),
+		Detail: fmt.Sprintf(format, a...),
 		Status: http.StatusText(409),
 	}
 }
 
 // InternalServerError generates a 500 error.
-func InternalServerError(id, format string, args ...interface{}) error {
+func InternalServerError(id, format string, a ...interface{}) error {
 	return &Error{
-		ID:     id,
+		Id:     id,
 		Code:   500,
-		Detail: fmt.Sprintf(format, args...),
+		Detail: fmt.Sprintf(format, a...),
 		Status: http.StatusText(500),
 	}
 }
 
 // NotImplemented generates a 501 error
-func NotImplemented(id, format string, args ...interface{}) error {
+func NotImplemented(id, format string, a ...interface{}) error {
 	return &Error{
-		ID:     id,
+		Id:     id,
 		Code:   501,
-		Detail: fmt.Sprintf(format, args...),
+		Detail: fmt.Sprintf(format, a...),
 		Status: http.StatusText(501),
 	}
 }
 
 // BadGateway generates a 502 error
-func BadGateway(id, format string, args ...interface{}) error {
+func BadGateway(id, format string, a ...interface{}) error {
 	return &Error{
-		ID:     id,
+		Id:     id,
 		Code:   502,
-		Detail: fmt.Sprintf(format, args...),
+		Detail: fmt.Sprintf(format, a...),
 		Status: http.StatusText(502),
 	}
 }
 
 // ServiceUnavailable generates a 503 error
-func ServiceUnavailable(id, format string, args ...interface{}) error {
+func ServiceUnavailable(id, format string, a ...interface{}) error {
 	return &Error{
-		ID:     id,
+		Id:     id,
 		Code:   503,
-		Detail: fmt.Sprintf(format, args...),
+		Detail: fmt.Sprintf(format, a...),
 		Status: http.StatusText(503),
 	}
 }
 
 // GatewayTimeout generates a 504 error
-func GatewayTimeout(id, format string, args ...interface{}) error {
+func GatewayTimeout(id, format string, a ...interface{}) error {
 	return &Error{
-		ID:     id,
+		Id:     id,
 		Code:   504,
-		Detail: fmt.Sprintf(format, args...),
+		Detail: fmt.Sprintf(format, a...),
 		Status: http.StatusText(504),
 	}
 }
@@ -233,27 +214,6 @@ func Equal(err1 error, err2 error) bool {
 	return true
 }
 
-// CodeIn return true if err has specified code
-func CodeIn(err interface{}, codes ...int32) bool {
-	var code int32
-	switch verr := err.(type) {
-	case *Error:
-		code = verr.Code
-	case int32:
-		code = verr
-	default:
-		return false
-	}
-
-	for _, check := range codes {
-		if code == check {
-			return true
-		}
-	}
-
-	return false
-}
-
 // FromError try to convert go error to *Error
 func FromError(err error) *Error {
 	if verr, ok := err.(*Error); ok && verr != nil {
@@ -262,81 +222,3 @@ func FromError(err error) *Error {
 
 	return Parse(err.Error())
 }
-
-// MarshalJSON returns error data
-func (e *Error) MarshalJSON() ([]byte, error) {
-	return e.Marshal()
-}
-
-// UnmarshalJSON set error data
-func (e *Error) UnmarshalJSON(data []byte) error {
-	return e.Unmarshal(data)
-}
-
-// ProtoMessage noop func
-func (e *Error) ProtoMessage() {}
-
-// Reset resets error
-func (e *Error) Reset() {
-	*e = Error{}
-}
-
-// String returns error as string
-func (e *Error) String() string {
-	return fmt.Sprintf(`{"id":"%s","detail":"%s","status":"%s","code":%d}`, addslashes(e.ID), addslashes(e.Detail), addslashes(e.Status), e.Code)
-}
-
-// Marshal returns error data
-func (e *Error) Marshal() ([]byte, error) {
-	return []byte(e.String()), nil
-}
-
-// Unmarshal set error data
-func (e *Error) Unmarshal(data []byte) error {
-	str := string(data)
-	if len(data) < 41 {
-		return fmt.Errorf("invalid data")
-	}
-	parts := strings.FieldsFunc(str[1:len(str)-1], func(r rune) bool {
-		return r == ','
-	})
-	for _, part := range parts {
-		nparts := strings.FieldsFunc(part, func(r rune) bool {
-			return r == ':'
-		})
-		for idx := 0; idx < len(nparts)/2; idx += 2 {
-			val := strings.Trim(nparts[idx+1], `"`)
-			if len(val) == 0 {
-				continue
-			}
-			switch {
-			case nparts[idx] == `"id"`:
-				e.ID = val
-			case nparts[idx] == `"detail"`:
-				e.Detail = val
-			case nparts[idx] == `"status"`:
-				e.Status = val
-			case nparts[idx] == `"code"`:
-				c, err := strconv.ParseInt(val, 10, 32)
-				if err != nil {
-					return err
-				}
-				e.Code = int32(c)
-			}
-			idx++
-		}
-	}
-	return nil
-}
-
-func addslashes(str string) string {
-	var buf bytes.Buffer
-	for _, char := range str {
-		switch char {
-		case '\'', '"', '\\':
-			buf.WriteRune('\\')
-		}
-		buf.WriteRune(char)
-	}
-	return buf.String()
-}

errors/errors.proto

@@ -1,31 +0,0 @@
-// Copyright 2021-2023 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.errors;
-
-option cc_enable_arenas = true;
-option go_package = "go.unistack.org/micro/v4/errors;errors";
-option java_multiple_files = true;
-option java_outer_classname = "MicroErrors";
-option java_package = "micro.errors";
-option objc_class_prefix = "MERRORS";
-
-message Error {
-  string id = 1;
-  string detail = 2;
-  string status = 3;
-  uint32 code = 4;
-}

errors/errors_test.go

@@ -1,43 +1,20 @@
 package errors
 
 import (
-	"encoding/json"
 	er "errors"
-	"fmt"
 	"net/http"
 	"testing"
 )
 
-func TestMarshalJSON(t *testing.T) {
-	e := InternalServerError("id", "err: %v", fmt.Errorf("err: %v", `xxx: "UNIX_TIMESTAMP": invalid identifier`))
-	_, err := json.Marshal(e)
-	if err != nil {
-		t.Fatal(err)
-	}
-}
-
-func TestEmpty(t *testing.T) {
-	msg := "test"
-	var err *Error
-	err = FromError(fmt.Errorf(msg))
-	if err.Detail != msg {
-		t.Fatalf("invalid error %v", err)
-	}
-	err = FromError(fmt.Errorf(`{"id":"","detail":"%s","status":"%s","code":0}`, msg, msg))
-	if err.Detail != msg || err.Status != msg {
-		t.Fatalf("invalid error %#+v", err)
-	}
-}
-
 func TestFromError(t *testing.T) {
 	err := NotFound("go.micro.test", "%s", "example")
 	merr := FromError(err)
-	if merr.ID != "go.micro.test" || merr.Code != 404 {
+	if merr.Id != "go.micro.test" || merr.Code != 404 {
 		t.Fatalf("invalid conversation %v != %v", err, merr)
 	}
 	err = er.New(err.Error())
 	merr = FromError(err)
-	if merr.ID != "go.micro.test" || merr.Code != 404 {
+	if merr.Id != "go.micro.test" || merr.Code != 404 {
 		t.Fatalf("invalid conversation %v != %v", err, merr)
 	}
 }
@@ -59,7 +36,7 @@ func TestEqual(t *testing.T) {
 func TestErrors(t *testing.T) {
 	testData := []*Error{
 		{
-			ID:     "test",
+			Id:     "test",
 			Code:   500,
 			Detail: "Internal server error",
 			Status: http.StatusText(500),
@@ -67,7 +44,7 @@ func TestErrors(t *testing.T) {
 	}
 
 	for _, e := range testData {
-		ne := New(e.ID, e.Detail, e.Code)
+		ne := New(e.Id, e.Detail, e.Code)
 
 		if e.Error() != ne.Error() {
 			t.Fatalf("Expected %s got %s", e.Error(), ne.Error())
@@ -79,8 +56,8 @@ func TestErrors(t *testing.T) {
 			t.Fatalf("Expected error got nil %v", pe)
 		}
 
-		if pe.ID != e.ID {
+		if pe.Id != e.Id {
-			t.Fatalf("Expected %s got %s", e.ID, pe.ID)
+			t.Fatalf("Expected %s got %s", e.Id, pe.Id)
 		}
 
 		if pe.Detail != e.Detail {
@@ -96,19 +73,3 @@ func TestErrors(t *testing.T) {
 		}
 	}
 }
-
-func TestCodeIn(t *testing.T) {
-	err := InternalServerError("id", "%s", "msg")
-
-	if ok := CodeIn(err, 400, 500); !ok {
-		t.Fatalf("CodeIn not works: %v", err)
-	}
-
-	if ok := CodeIn(err.(*Error).Code, 500); !ok {
-		t.Fatalf("CodeIn not works: %v", err)
-	}
-
-	if ok := CodeIn(err, 100); ok {
-		t.Fatalf("CodeIn not works: %v", err)
-	}
-}

event.go

@@ -0,0 +1,27 @@
+package micro
+
+import (
+	"context"
+
+	"github.com/unistack-org/micro/v3/client"
+)
+
+// Event is used to publish messages to a topic
+type Event interface {
+	// Publish publishes a message to the event topic
+	Publish(ctx context.Context, msg interface{}, opts ...client.PublishOption) error
+}
+
+type event struct {
+	c     client.Client
+	topic string
+}
+
+// NewEvent creates a new event publisher
+func NewEvent(topic string, c client.Client) Event {
+	return &event{c, topic}
+}
+
+func (e *event) Publish(ctx context.Context, msg interface{}, opts ...client.PublishOption) error {
+	return e.c.Publish(ctx, e.c.NewMessage(e.topic, msg), opts...)
+}

flow/context.go

@@ -22,3 +22,13 @@ func NewContext(ctx context.Context, f Flow) context.Context {
 	}
 	return context.WithValue(ctx, flowKey{}, f)
 }
+
+// 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)
+	}
+}

flow/context_test.go

@@ -1,42 +0,0 @@
-package flow
-
-import (
-	"context"
-	"testing"
-)
-
-func TestFromNilContext(t *testing.T) {
-	// nolint: staticcheck
-	c, ok := FromContext(nil)
-	if ok || c != nil {
-		t.Fatal("FromContext not works")
-	}
-}
-
-func TestNewNilContext(t *testing.T) {
-	// nolint: staticcheck
-	ctx := NewContext(nil, NewFlow())
-
-	c, ok := FromContext(ctx)
-	if c == nil || !ok {
-		t.Fatal("NewContext not works")
-	}
-}
-
-func TestFromContext(t *testing.T) {
-	ctx := context.WithValue(context.TODO(), flowKey{}, NewFlow())
-
-	c, ok := FromContext(ctx)
-	if c == nil || !ok {
-		t.Fatal("FromContext not works")
-	}
-}
-
-func TestNewContext(t *testing.T) {
-	ctx := NewContext(context.TODO(), NewFlow())
-
-	c, ok := FromContext(ctx)
-	if c == nil || !ok {
-		t.Fatal("NewContext not works")
-	}
-}

flow/dag_test.go

@@ -7,56 +7,6 @@ import (
 	"github.com/silas/dag"
 )
 
-func TestDeps(t *testing.T) {
-	t.Skip()
-	d := &dag.AcyclicGraph{}
-
-	v0 := d.Add(&node{"v0"})
-	v1 := d.Add(&node{"v1"})
-	v2 := d.Add(&node{"v2"})
-	v3 := d.Add(&node{"v3"})
-	v4 := d.Add(&node{"v4"})
-
-	d.Connect(dag.BasicEdge(v0, v1))
-	d.Connect(dag.BasicEdge(v1, v2))
-	d.Connect(dag.BasicEdge(v2, v4))
-	d.Connect(dag.BasicEdge(v0, v3))
-	d.Connect(dag.BasicEdge(v3, v4))
-
-	if err := d.Validate(); err != nil {
-		t.Fatal(err)
-	}
-
-	d.TransitiveReduction()
-
-	var steps [][]string
-	fn := func(n dag.Vertex, idx int) error {
-		if idx == 0 {
-			steps = make([][]string, 1)
-			steps[0] = make([]string, 0, 1)
-		} else if idx >= len(steps) {
-			tsteps := make([][]string, idx+1)
-			copy(tsteps, steps)
-			steps = tsteps
-			steps[idx] = make([]string, 0, 1)
-		}
-		steps[idx] = append(steps[idx], fmt.Sprintf("%s", n))
-		return nil
-	}
-
-	start := &node{"v0"}
-	err := d.SortedDepthFirstWalk([]dag.Vertex{start}, fn)
-	checkErr(t, err)
-
-	for idx, steps := range steps {
-		fmt.Printf("level %d steps %#+v\n", idx, steps)
-	}
-
-	if len(steps[2]) != 1 {
-		t.Logf("invalid steps %#+v", steps[2])
-	}
-}
-
 func checkErr(t *testing.T, err error) {
 	if err != nil {
 		t.Fatal(err)

flow/default.go

@@ -5,15 +5,10 @@ import (
 	"fmt"
 	"sync"
 
+	"github.com/google/uuid"
 	"github.com/silas/dag"
-	"go.unistack.org/micro/v4/client"
+	"github.com/unistack-org/micro/v3/client"
-	"go.unistack.org/micro/v4/codec"
+	"github.com/unistack-org/micro/v3/codec"
-	"go.unistack.org/micro/v4/logger"
-	"go.unistack.org/micro/v4/metadata"
-	"go.unistack.org/micro/v4/options"
-	moptions "go.unistack.org/micro/v4/options"
-	"go.unistack.org/micro/v4/store"
-	"go.unistack.org/micro/v4/util/id"
 )
 
 type microFlow struct {
@@ -21,94 +16,49 @@ type microFlow struct {
 }
 
 type microWorkflow struct {
-	opts   Options
-	g      *dag.AcyclicGraph
-	steps  map[string]Step
 	id   string
-	status Status
+	g    *dag.AcyclicGraph
-	sync.RWMutex
 	init bool
+	sync.RWMutex
+	opts  Options
+	steps map[string]Step
 }
 
 func (w *microWorkflow) ID() string {
 	return w.id
 }
 
-func (w *microWorkflow) Steps() ([][]Step, error) {
+func (w *microWorkflow) Steps() [][]Step {
-	return w.getSteps("", false)
-}
-
-func (w *microWorkflow) Status() Status {
-	return w.status
-}
-
-func (w *microWorkflow) AppendSteps(steps ...Step) error {
-	w.Lock()
-
-	for _, s := range steps {
-		w.steps[s.String()] = s
-		w.g.Add(s)
-	}
-
-	for _, dst := range steps {
-		for _, req := range dst.Requires() {
-			src, ok := w.steps[req]
-			if !ok {
-				return ErrStepNotExists
-			}
-			w.g.Connect(dag.BasicEdge(src, dst))
-		}
-	}
-
-	if err := w.g.Validate(); err != nil {
-		w.Unlock()
-		return err
-	}
-
-	w.g.TransitiveReduction()
-
-	w.Unlock()
-
 	return nil
 }
 
-func (w *microWorkflow) RemoveSteps(steps ...Step) error {
+func (w *microWorkflow) AppendSteps(ctx context.Context, steps ...Step) error {
-	// TODO: handle case when some step requires or required by removed step
-
-	w.Lock()
-
-	for _, s := range steps {
-		delete(w.steps, s.String())
-		w.g.Remove(s)
-	}
-
-	for _, dst := range steps {
-		for _, req := range dst.Requires() {
-			src, ok := w.steps[req]
-			if !ok {
-				return ErrStepNotExists
-			}
-			w.g.Connect(dag.BasicEdge(src, dst))
-		}
-	}
-
-	if err := w.g.Validate(); err != nil {
-		w.Unlock()
-		return err
-	}
-
-	w.g.TransitiveReduction()
-
-	w.Unlock()
-
 	return nil
 }
 
-func (w *microWorkflow) getSteps(start string, reverse bool) ([][]Step, error) {
+func (w *microWorkflow) RemoveSteps(ctx context.Context, steps ...Step) error {
+	return nil
+}
+
+func (w *microWorkflow) Execute(ctx context.Context, req interface{}, opts ...ExecuteOption) (string, error) {
+	w.Lock()
+	if !w.init {
+		if err := w.g.Validate(); err != nil {
+			w.Unlock()
+			return "", err
+		}
+		w.g.TransitiveReduction()
+		w.init = true
+	}
+	w.Unlock()
+
+	uid, err := uuid.NewRandom()
+	if err != nil {
+		return "", err
+	}
+
+	options := NewExecuteOptions(opts...)
 	var steps [][]Step
-	var root dag.Vertex
-	var err error
-
 	fn := func(n dag.Vertex, idx int) error {
 		if idx == 0 {
 			steps = make([][]Step, 1)
@@ -123,235 +73,62 @@ func (w *microWorkflow) getSteps(start string, reverse bool) ([][]Step, error) {
 		return nil
 	}
 
-	if start != "" {
+	var root dag.Vertex
+	if options.Start != "" {
 		var ok bool
 		w.RLock()
-		root, ok = w.steps[start]
+		root, ok = w.steps[options.Start]
 		w.RUnlock()
 		if !ok {
-			return nil, ErrStepNotExists
+			return "", ErrStepNotExists
 		}
 	} else {
 		root, err = w.g.Root()
 		if err != nil {
-			return nil, err
+			return "", err
 		}
 	}
-
+	if options.Reverse {
-	if reverse {
 		err = w.g.SortedReverseDepthFirstWalk([]dag.Vertex{root}, fn)
 	} else {
 		err = w.g.SortedDepthFirstWalk([]dag.Vertex{root}, fn)
 	}
 	if err != nil {
-		return nil, err
-	}
-
-	return steps, nil
-}
-
-func (w *microWorkflow) Abort(ctx context.Context, id string) error {
-	workflowStore := store.NewNamespaceStore(w.opts.Store, "workflows"+w.opts.Store.Options().Separator+id)
-	return workflowStore.Write(ctx, "status", &codec.Frame{Data: []byte(StatusAborted.String())})
-}
-
-func (w *microWorkflow) Suspend(ctx context.Context, id string) error {
-	workflowStore := store.NewNamespaceStore(w.opts.Store, "workflows"+w.opts.Store.Options().Separator+id)
-	return workflowStore.Write(ctx, "status", &codec.Frame{Data: []byte(StatusSuspend.String())})
-}
-
-func (w *microWorkflow) Resume(ctx context.Context, id string) error {
-	workflowStore := store.NewNamespaceStore(w.opts.Store, "workflows"+w.opts.Store.Options().Separator+id)
-	return workflowStore.Write(ctx, "status", &codec.Frame{Data: []byte(StatusRunning.String())})
-}
-
-func (w *microWorkflow) Execute(ctx context.Context, req *Message, opts ...options.Option) (string, error) {
-	w.Lock()
-	if !w.init {
-		if err := w.g.Validate(); err != nil {
-			w.Unlock()
-			return "", err
-		}
-		w.g.TransitiveReduction()
-		w.init = true
-	}
-	w.Unlock()
-
-	eid, err := id.New()
-	if err != nil {
-		return "", err
-	}
-
-	stepStore := store.NewNamespaceStore(w.opts.Store, "steps"+w.opts.Store.Options().Separator+eid)
-	workflowStore := store.NewNamespaceStore(w.opts.Store, "workflows"+w.opts.Store.Options().Separator+eid)
-
-	options := NewExecuteOptions(opts...)
-
-	steps, err := w.getSteps(options.Start, options.Reverse)
-	if err != nil {
-		if werr := workflowStore.Write(w.opts.Context, "status", &codec.Frame{Data: []byte(StatusPending.String())}); werr != nil {
-			w.opts.Logger.Error(w.opts.Context, "store write error", "error", werr.Error())
-		}
 		return "", err
 	}
 
 	var wg sync.WaitGroup
 	cherr := make(chan error, 1)
-	chstatus := make(chan Status, 1)
+	defer close(cherr)
 
 	nctx, cancel := context.WithCancel(ctx)
 	defer cancel()
-
+	nopts := make([]ExecuteOption, 0, len(opts)+5)
-	nopts := make([]moptions.Option, 0, len(opts)+5)
+	nopts = append(nopts, ExecuteClient(w.opts.Client), ExecuteTracer(w.opts.Tracer), ExecuteLogger(w.opts.Logger), ExecuteMeter(w.opts.Meter), ExecuteStore(w.opts.Store))
-
-	nopts = append(nopts,
-		moptions.Client(w.opts.Client),
-		moptions.Tracer(w.opts.Tracer),
-		moptions.Logger(w.opts.Logger),
-		moptions.Meter(w.opts.Meter),
-	)
-	nopts = append(nopts, opts...)
-	done := make(chan struct{})
-
-	if werr := workflowStore.Write(w.opts.Context, "status", &codec.Frame{Data: []byte(StatusRunning.String())}); werr != nil {
-		w.opts.Logger.Error(w.opts.Context, "store write error", "error", werr.Error())
-		return eid, werr
-	}
-	for idx := range steps {
-		for nidx := range steps[idx] {
-			cstep := steps[idx][nidx]
-			if werr := stepStore.Write(ctx, cstep.ID()+w.opts.Store.Options().Separator+"status", &codec.Frame{Data: []byte(StatusPending.String())}); werr != nil {
-				return eid, werr
-			}
-		}
-	}
 
 	go func() {
 		for idx := range steps {
+			wg.Add(len(steps[idx]))
 			for nidx := range steps[idx] {
-				wStatus := &codec.Frame{}
-				if werr := workflowStore.Read(w.opts.Context, "status", wStatus); werr != nil {
-					cherr <- werr
-					return
-				}
-				if status := StringStatus[string(wStatus.Data)]; status != StatusRunning {
-					chstatus <- status
-					return
-				}
-				if w.opts.Logger.V(logger.TraceLevel) {
-					w.opts.Logger.Trace(nctx, fmt.Sprintf("step will be executed %v", steps[idx][nidx]))
-				}
-				cstep := steps[idx][nidx]
-				// nolint: nestif
-				if len(cstep.Requires()) == 0 {
-					wg.Add(1)
 				go func(step Step) {
 					defer wg.Done()
-						if werr := stepStore.Write(ctx, step.ID()+w.opts.Store.Options().Separator+"req", req); werr != nil {
+					if err = step.Execute(nctx, req, nopts...); err != nil {
-							cherr <- werr
+						cherr <- err
-							return
+						cancel()
 					}
-						if werr := stepStore.Write(ctx, step.ID()+w.opts.Store.Options().Separator+"status", &codec.Frame{Data: []byte(StatusRunning.String())}); werr != nil {
+				}(steps[idx][nidx])
-							cherr <- werr
-							return
 			}
-						rsp, serr := step.Execute(nctx, req, nopts...)
-						if serr != nil {
-							step.SetStatus(StatusFailure)
-							if werr := stepStore.Write(ctx, step.ID()+w.opts.Store.Options().Separator+"rsp", serr); werr != nil && w.opts.Logger.V(logger.ErrorLevel) {
-								w.opts.Logger.Error(ctx, "store write error", "error", werr.Error())
-							}
-							if werr := stepStore.Write(ctx, step.ID()+w.opts.Store.Options().Separator+"status", &codec.Frame{Data: []byte(StatusFailure.String())}); werr != nil && w.opts.Logger.V(logger.ErrorLevel) {
-								w.opts.Logger.Error(ctx, "store write error", "error", werr.Error())
-							}
-							cherr <- serr
-							return
-						}
-						if werr := stepStore.Write(ctx, step.ID()+w.opts.Store.Options().Separator+"rsp", rsp); werr != nil {
-							w.opts.Logger.Error(ctx, "store write error", "error", werr.Error())
-							cherr <- werr
-							return
-						}
-						if werr := stepStore.Write(ctx, step.ID()+w.opts.Store.Options().Separator+"status", &codec.Frame{Data: []byte(StatusSuccess.String())}); werr != nil {
-							w.opts.Logger.Error(ctx, "store write error", "error", werr.Error())
-							cherr <- werr
-							return
-						}
-					}(cstep)
 			wg.Wait()
-				} else {
-					if werr := stepStore.Write(ctx, cstep.ID()+w.opts.Store.Options().Separator+"req", req); werr != nil {
-						cherr <- werr
-						return
 		}
-					if werr := stepStore.Write(ctx, cstep.ID()+w.opts.Store.Options().Separator+"status", &codec.Frame{Data: []byte(StatusRunning.String())}); werr != nil {
+		cherr <- nil
-						cherr <- werr
-						return
-					}
-					rsp, serr := cstep.Execute(nctx, req, nopts...)
-					if serr != nil {
-						cstep.SetStatus(StatusFailure)
-						if werr := stepStore.Write(ctx, cstep.ID()+w.opts.Store.Options().Separator+"rsp", serr); werr != nil && w.opts.Logger.V(logger.ErrorLevel) {
-							w.opts.Logger.Error(ctx, "store write error", "error", werr.Error())
-						}
-						if werr := stepStore.Write(ctx, cstep.ID()+w.opts.Store.Options().Separator+"status", &codec.Frame{Data: []byte(StatusFailure.String())}); werr != nil && w.opts.Logger.V(logger.ErrorLevel) {
-							w.opts.Logger.Error(ctx, "store write error", "error", werr.Error())
-						}
-						cherr <- serr
-						return
-					}
-					if werr := stepStore.Write(ctx, cstep.ID()+w.opts.Store.Options().Separator+"rsp", rsp); werr != nil {
-						w.opts.Logger.Error(ctx, "store write error", "error", werr.Error())
-						cherr <- werr
-						return
-					}
-					if werr := stepStore.Write(ctx, cstep.ID()+w.opts.Store.Options().Separator+"status", &codec.Frame{Data: []byte(StatusSuccess.String())}); werr != nil {
-						cherr <- werr
-						return
-					}
-				}
-			}
-		}
-		close(done)
 	}()
 
-	if options.Async {
+	err = <-cherr
-		return eid, nil
+
+	return uid.String(), err
 }
 
-	w.opts.Logger.Trace(ctx, "wait for finish or error")
+func NewFlow(opts ...Option) Flow {
-	select {
-	case <-nctx.Done():
-		err = nctx.Err()
-	case cerr := <-cherr:
-		err = cerr
-	case <-done:
-		close(cherr)
-	case <-chstatus:
-		close(chstatus)
-		return eid, nil
-	}
-
-	switch {
-	case nctx.Err() != nil:
-		if werr := workflowStore.Write(w.opts.Context, "status", &codec.Frame{Data: []byte(StatusAborted.String())}); werr != nil {
-			w.opts.Logger.Error(w.opts.Context, "store write error", "error", werr.Error())
-		}
-	case err == nil:
-		if werr := workflowStore.Write(w.opts.Context, "status", &codec.Frame{Data: []byte(StatusSuccess.String())}); werr != nil {
-			w.opts.Logger.Error(w.opts.Context, "store write error", "error", werr.Error())
-		}
-	case err != nil:
-		if werr := workflowStore.Write(w.opts.Context, "status", &codec.Frame{Data: []byte(StatusFailure.String())}); werr != nil {
-			w.opts.Logger.Error(w.opts.Context, "store write error", "error", werr.Error())
-		}
-	}
-
-	return eid, err
-}
-
-// NewFlow create new flow
-func NewFlow(opts ...options.Option) Flow {
 	options := NewOptions(opts...)
 	return &microFlow{opts: options}
 }
@@ -360,7 +137,7 @@ func (f *microFlow) Options() Options {
 	return f.opts
 }
 
-func (f *microFlow) Init(opts ...options.Option) error {
+func (f *microFlow) Init(opts ...Option) error {
 	for _, o := range opts {
 		o(&f.opts)
 	}
@@ -427,20 +204,9 @@ func (f *microFlow) WorkflowLoad(ctx context.Context, id string) (Workflow, erro
 }
 
 type microCallStep struct {
-	rsp     *Message
+	opts    StepOptions
-	req     *Message
 	service string
 	method  string
-	opts    StepOptions
-	status  Status
-}
-
-func (s *microCallStep) Request() *Message {
-	return s.req
-}
-
-func (s *microCallStep) Response() *Message {
-	return s.rsp
 }
 
 func (s *microCallStep) ID() string {
@@ -481,49 +247,23 @@ func (s *microCallStep) Hashcode() interface{} {
 	return s.String()
 }
 
-func (s *microCallStep) GetStatus() Status {
+func (s *microCallStep) Execute(ctx context.Context, req interface{}, opts ...ExecuteOption) error {
-	return s.status
-}
-
-func (s *microCallStep) SetStatus(status Status) {
-	s.status = status
-}
-
-func (s *microCallStep) Execute(ctx context.Context, req *Message, opts ...options.Option) (*Message, error) {
 	options := NewExecuteOptions(opts...)
 	if options.Client == nil {
-		return nil, ErrMissingClient
+		return fmt.Errorf("client not set")
 	}
 	rsp := &codec.Frame{}
-	copts := []moptions.Option{client.Retries(0)}
+	copts := []client.CallOption{client.WithRetries(0)}
 	if options.Timeout > 0 {
-		copts = append(copts,
+		copts = append(copts, client.WithRequestTimeout(options.Timeout), client.WithDialTimeout(options.Timeout))
-			client.RequestTimeout(options.Timeout),
-			client.DialTimeout(options.Timeout))
 	}
-	nctx := metadata.NewOutgoingContext(ctx, req.Header)
+	err := options.Client.Call(ctx, options.Client.NewRequest(s.service, s.method, req), rsp)
-	err := options.Client.Call(nctx, options.Client.NewRequest(s.service, s.method, &codec.Frame{Data: req.Body}), rsp, copts...)
+	return err
-	if err != nil {
-		return nil, err
-	}
-	md, _ := metadata.FromOutgoingContext(nctx)
-	return &Message{Header: md, Body: rsp.Data}, err
 }
 
 type microPublishStep struct {
-	req    *Message
-	rsp    *Message
-	topic  string
 	opts  StepOptions
-	status Status
+	topic string
-}
-
-func (s *microPublishStep) Request() *Message {
-	return s.req
-}
-
-func (s *microPublishStep) Response() *Message {
-	return s.rsp
 }
 
 func (s *microPublishStep) ID() string {
@@ -553,7 +293,7 @@ func (s *microPublishStep) String() string {
 	if s.opts.ID != "" {
 		return s.opts.ID
 	}
-	return s.topic
+	return fmt.Sprintf("%s", s.topic)
 }
 
 func (s *microPublishStep) Name() string {
@@ -564,26 +304,16 @@ func (s *microPublishStep) Hashcode() interface{} {
 	return s.String()
 }
 
-func (s *microPublishStep) GetStatus() Status {
+func (s *microPublishStep) Execute(ctx context.Context, req interface{}, opts ...ExecuteOption) error {
-	return s.status
+	return nil
 }
 
-func (s *microPublishStep) SetStatus(status Status) {
+func NewCallStep(service string, method string, opts ...StepOption) Step {
-	s.status = status
-}
-
-func (s *microPublishStep) Execute(ctx context.Context, req *Message, opts ...options.Option) (*Message, error) {
-	return nil, nil
-}
-
-// NewCallStep create new step with client.Call
-func NewCallStep(service string, name string, method string, opts ...options.Option) Step {
 	options := NewStepOptions(opts...)
-	return &microCallStep{service: service, method: name + "." + method, opts: options}
+	return &microCallStep{service: service, method: method, opts: options}
 }
 
-// NewPublishStep create new step with client.Publish
+func NewPublishStep(topic string, opts ...StepOption) Step {
-func NewPublishStep(topic string, opts ...options.Option) Step {
 	options := NewStepOptions(opts...)
 	return &microPublishStep{topic: topic, opts: options}
 }

flow/flow.go

@@ -1,50 +1,15 @@
 // Package flow is an interface used for saga pattern microservice workflow
-package flow // import "go.unistack.org/micro/v4/flow"
+package flow
 
 import (
 	"context"
 	"errors"
-	"sync"
-	"sync/atomic"
-
-	"go.unistack.org/micro/v4/metadata"
-	"go.unistack.org/micro/v4/options"
 )
 
 var (
-	// ErrStepNotExists returns when step not found
 	ErrStepNotExists = errors.New("step not exists")
-	// ErrMissingClient returns when client.Client is missing
-	ErrMissingClient = errors.New("client not set")
 )
 
-// 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
-
-// MarshalJSON returns m as the JSON encoding of m.
-func (m *RawMessage) MarshalJSON() ([]byte, error) {
-	if m == nil {
-		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
-}
-
-// Message used to transfer data between steps
-type Message struct {
-	Header metadata.Metadata
-	Body   RawMessage
-}
-
 // Step represents dedicated workflow step
 type Step interface {
 	// ID returns step id
@@ -52,7 +17,7 @@ type Step interface {
 	// Endpoint returns rpc endpoint service_name.service_method or broker topic
 	Endpoint() string
 	// Execute step run
-	Execute(ctx context.Context, req *Message, opts ...options.Option) (*Message, error)
+	Execute(ctx context.Context, req interface{}, opts ...ExecuteOption) error
 	// Requires returns dependent steps
 	Requires() []string
 	// Options returns step options
@@ -61,79 +26,20 @@ type Step interface {
 	Require(steps ...Step) error
 	// String
 	String() string
-	// GetStatus returns step status
-	GetStatus() Status
-	// SetStatus sets the step status
-	SetStatus(Status)
-	// Request returns step request message
-	Request() *Message
-	// Response returns step response message
-	Response() *Message
 }
 
-// Status contains step current status
-type Status int
-
-func (status Status) String() string {
-	return StatusString[status]
-}
-
-const (
-	// StatusPending step waiting to start
-	StatusPending Status = iota
-	// StatusRunning step is running
-	StatusRunning
-	// StatusFailure step competed with error
-	StatusFailure
-	// StatusSuccess step completed without error
-	StatusSuccess
-	// StatusAborted step aborted while it running
-	StatusAborted
-	// StatusSuspend step suspended
-	StatusSuspend
-)
-
-var (
-	// StatusString contains map status => string
-	StatusString = map[Status]string{
-		StatusPending: "StatusPending",
-		StatusRunning: "StatusRunning",
-		StatusFailure: "StatusFailure",
-		StatusSuccess: "StatusSuccess",
-		StatusAborted: "StatusAborted",
-		StatusSuspend: "StatusSuspend",
-	}
-	// StringStatus contains map string => status
-	StringStatus = map[string]Status{
-		"StatusPending": StatusPending,
-		"StatusRunning": StatusRunning,
-		"StatusFailure": StatusFailure,
-		"StatusSuccess": StatusSuccess,
-		"StatusAborted": StatusAborted,
-		"StatusSuspend": StatusSuspend,
-	}
-)
-
 // Workflow contains all steps to execute
 type Workflow interface {
 	// ID returns id of the workflow
 	ID() string
-	// Execute workflow with args, return execution id and error
-	Execute(ctx context.Context, req *Message, opts ...options.Option) (string, error)
-	// RemoveSteps remove steps from workflow
-	RemoveSteps(steps ...Step) error
-	// AppendSteps append steps to workflow
-	AppendSteps(steps ...Step) error
-	// Status returns workflow status
-	Status() Status
 	// Steps returns steps slice where parallel steps returned on the same level
-	Steps() ([][]Step, error)
+	Steps() [][]Step
-	// Suspend suspends execution
+	// Execute workflow with args, return execution id and error
-	Suspend(ctx context.Context, id string) error
+	Execute(ctx context.Context, req interface{}, opts ...ExecuteOption) (string, error)
-	// Resume resumes execution
+	// RemoveSteps remove steps from workflow
-	Resume(ctx context.Context, id string) error
+	RemoveSteps(ctx context.Context, steps ...Step) error
-	// Abort abort execution
+	// AppendSteps append steps to workflow
-	Abort(ctx context.Context, id string) error
+	AppendSteps(ctx context.Context, steps ...Step) error
 }
 
 // Flow the base interface to interact with workflows
@@ -141,7 +47,7 @@ type Flow interface {
 	// Options returns options
 	Options() Options
 	// Init initialize
-	Init(...options.Option) error
+	Init(...Option) error
 	// WorkflowCreate creates new workflow with specific id and steps
 	WorkflowCreate(ctx context.Context, id string, steps ...Step) (Workflow, error)
 	// WorkflowSave saves workflow
@@ -151,16 +57,3 @@ type Flow interface {
 	// WorkflowList lists all workflows
 	WorkflowList(ctx context.Context) ([]Workflow, error)
 }
-
-var (
-	flowMu      sync.Mutex
-	atomicSteps atomic.Value
-)
-
-// RegisterStep register own step with workflow
-func RegisterStep(step Step) {
-	flowMu.Lock()
-	steps, _ := atomicSteps.Load().([]Step)
-	atomicSteps.Store(append(steps, step))
-	flowMu.Unlock()
-}

flow/flow_test.go

@@ -1,36 +0,0 @@
-package flow
-
-import (
-	"reflect"
-	"testing"
-)
-
-func FuzzMarshall(f *testing.F) {
-	f.Fuzz(func(t *testing.T, ref []byte) {
-		rm := RawMessage(ref)
-
-		b, err := rm.MarshalJSON()
-		if err != nil {
-			t.Errorf("Error MarshalJSON: %s", err)
-		}
-
-		if !reflect.DeepEqual(ref, b) {
-			t.Errorf("Error. Expected '%s', was '%s'", ref, b)
-		}
-	})
-}
-
-func FuzzUnmarshall(f *testing.F) {
-	f.Fuzz(func(t *testing.T, ref string) {
-		b := []byte(ref)
-		rm := RawMessage(b)
-
-		if err := rm.UnmarshalJSON(b); err != nil {
-			t.Errorf("Error UnmarshalJSON: %s", err)
-		}
-
-		if ref != string(rm) {
-			t.Errorf("Error. Expected '%s', was '%s'", ref, rm)
-		}
-	})
-}

flow/options.go

@@ -4,14 +4,16 @@ import (
 	"context"
 	"time"
 
-	"go.unistack.org/micro/v4/client"
+	"github.com/unistack-org/micro/v3/client"
-	"go.unistack.org/micro/v4/logger"
+	"github.com/unistack-org/micro/v3/logger"
-	"go.unistack.org/micro/v4/meter"
+	"github.com/unistack-org/micro/v3/meter"
-	"go.unistack.org/micro/v4/options"
+	"github.com/unistack-org/micro/v3/store"
-	"go.unistack.org/micro/v4/store"
+	"github.com/unistack-org/micro/v3/tracer"
-	"go.unistack.org/micro/v4/tracer"
 )
 
+// Option func
+type Option func(*Options)
+
 // Options server struct
 type Options struct {
 	// Context holds the external options and can be used for flow shutdown
@@ -29,7 +31,7 @@ type Options struct {
 }
 
 // NewOptions returns new options struct with default or passed values
-func NewOptions(opts ...options.Option) Options {
+func NewOptions(opts ...Option) Options {
 	options := Options{
 		Context: context.Background(),
 		Logger:  logger.DefaultLogger,
@@ -45,13 +47,66 @@ func NewOptions(opts ...options.Option) Options {
 	return options
 }
 
-// WorkflowOptions holds workflow options
+// Logger sets the logger option
-type WorkflowOptions struct {
+func Logger(l logger.Logger) Option {
-	Context context.Context
+	return func(o *Options) {
-	ID      string
+		o.Logger = l
+	}
+}
+
+// Meter sets the meter option
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
+// Client to use for sync/async communication
+func Client(c client.Client) Option {
+	return func(o *Options) {
+		o.Client = c
+	}
+}
+
+// Context specifies a context for the service.
+// Can be used to signal shutdown of the flow
+// Can be used for extra option values.
+func Context(ctx context.Context) Option {
+	return func(o *Options) {
+		o.Context = ctx
+	}
+}
+
+// Tracer mechanism for distributed tracking
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}
+
+// Store used for intermediate results
+func Store(s store.Store) Option {
+	return func(o *Options) {
+		o.Store = s
+	}
+}
+
+// WorflowOption signature
+type WorkflowOption func(*WorkflowOptions)
+
+// WorkflowOptions holds workflow options
+type WorkflowOptions struct {
+	ID      string
+	Context context.Context
+}
+
+// WorkflowID set workflow id
+func WorkflowID(id string) WorkflowOption {
+	return func(o *WorkflowOptions) {
+		o.ID = id
+	}
 }
 
-// ExecuteOptions holds execute options
 type ExecuteOptions struct {
 	// Client holds the client.Client
 	Client client.Client
@@ -61,83 +116,107 @@ type ExecuteOptions struct {
 	Logger logger.Logger
 	// Meter holds the meter
 	Meter meter.Meter
+	// Store used for intermediate results
+	Store store.Store
 	// Context can be used to abort execution or pass additional opts
 	Context context.Context
 	// Start step
 	Start string
-	// Timeout for execution
-	Timeout time.Duration
 	// Reverse execution
 	Reverse bool
-	// Async enables async execution
+	// Timeout for execution
-	Async bool
+	Timeout time.Duration
 }
 
-// Reverse says that dag must be run in reverse order
+type ExecuteOption func(*ExecuteOptions)
-func Reverse(b bool) options.Option {
+
-	return func(src interface{}) error {
+func ExecuteClient(c client.Client) ExecuteOption {
-		return options.Set(src, b, ".Reverse")
+	return func(o *ExecuteOptions) {
+		o.Client = c
 	}
 }
 
-// Async says that caller does not wait for execution complete
+func ExecuteTracer(t tracer.Tracer) ExecuteOption {
-func Async(b bool) options.Option {
+	return func(o *ExecuteOptions) {
-	return func(src interface{}) error {
+		o.Tracer = t
-		return options.Set(src, b, ".Async")
 	}
 }
 
-// NewExecuteOptions create new ExecuteOptions struct
+func ExecuteLogger(l logger.Logger) ExecuteOption {
-func NewExecuteOptions(opts ...options.Option) ExecuteOptions {
+	return func(o *ExecuteOptions) {
-	options := ExecuteOptions{
+		o.Logger = l
-		Client:  client.DefaultClient,
-		Logger:  logger.DefaultLogger,
-		Tracer:  tracer.DefaultTracer,
-		Meter:   meter.DefaultMeter,
-		Context: context.Background(),
 	}
+}
+
+func ExecuteMeter(m meter.Meter) ExecuteOption {
+	return func(o *ExecuteOptions) {
+		o.Meter = m
+	}
+}
+
+func ExecuteStore(s store.Store) ExecuteOption {
+	return func(o *ExecuteOptions) {
+		o.Store = s
+	}
+}
+
+func ExecuteContext(ctx context.Context) ExecuteOption {
+	return func(o *ExecuteOptions) {
+		o.Context = ctx
+	}
+}
+
+func ExecuteReverse(b bool) ExecuteOption {
+	return func(o *ExecuteOptions) {
+		o.Reverse = b
+	}
+}
+
+func ExecuteTimeout(td time.Duration) ExecuteOption {
+	return func(o *ExecuteOptions) {
+		o.Timeout = td
+	}
+}
+
+func NewExecuteOptions(opts ...ExecuteOption) ExecuteOptions {
+	options := ExecuteOptions{}
 	for _, o := range opts {
 		o(&options)
 	}
 	return options
 }
 
-// StepOptions holds step options
 type StepOptions struct {
-	Context  context.Context
-	Fallback string
 	ID       string
+	Context  context.Context
 	Requires []string
+	Fallback string
 }
 
-// NewStepOptions create new StepOptions struct
+type StepOption func(*StepOptions)
-func NewStepOptions(opts ...options.Option) StepOptions {
+
-	options := StepOptions{
+func NewStepOptions(opts ...StepOption) StepOptions {
-		Context: context.Background(),
+	options := StepOptions{Context: context.Background()}
-	}
 	for _, o := range opts {
 		o(&options)
 	}
 	return options
 }
 
-// Requires specifies required steps
+func StepID(id string) StepOption {
-func Requires(steps ...string) options.Option {
+	return func(o *StepOptions) {
-	return func(src interface{}) error {
+		o.ID = id
-		return options.Set(src, steps, ".Requires")
 	}
 }
 
-// Fallback set the step to run on error
+func StepRequires(steps ...string) StepOption {
-func Fallback(step string) options.Option {
+	return func(o *StepOptions) {
-	return func(src interface{}) error {
+		o.Requires = steps
-		return options.Set(src, step, ".Fallback")
 	}
 }
 
-// ID sets the step ID
+func StepFallback(step string) StepOption {
-func StepID(id string) options.Option {
+	return func(o *StepOptions) {
-	return func(src interface{}) error {
+		o.Fallback = step
-		return options.Set(src, id, ".ID")
 	}
 }

fsm/default.go

@@ -1,126 +0,0 @@
-package fsm
-
-import (
-	"context"
-	"fmt"
-	"sync"
-)
-
-type state struct {
-	body interface{}
-	name string
-}
-
-var _ State = &state{}
-
-func (s *state) Name() string {
-	return s.name
-}
-
-func (s *state) Body() interface{} {
-	return s.body
-}
-
-// fsm is a finite state machine
-type fsm struct {
-	statesMap   map[string]StateFunc
-	current     string
-	statesOrder []string
-	opts        Options
-	mu          sync.Mutex
-}
-
-// NewFSM creates a new finite state machine having the specified initial state
-// with specified options
-func NewFSM(opts ...Option) *fsm {
-	return &fsm{
-		statesMap: map[string]StateFunc{},
-		opts:      NewOptions(opts...),
-	}
-}
-
-// Current returns the current state
-func (f *fsm) Current() string {
-	f.mu.Lock()
-	s := f.current
-	f.mu.Unlock()
-	return s
-}
-
-// Current returns the current state
-func (f *fsm) Reset() {
-	f.mu.Lock()
-	f.current = f.opts.Initial
-	f.mu.Unlock()
-}
-
-// State adds state to fsm
-func (f *fsm) State(state string, fn StateFunc) {
-	f.mu.Lock()
-	f.statesMap[state] = fn
-	f.statesOrder = append(f.statesOrder, state)
-	f.mu.Unlock()
-}
-
-// Start runs state machine with provided data
-func (f *fsm) Start(ctx context.Context, args interface{}, opts ...Option) (interface{}, error) {
-	var err error
-
-	f.mu.Lock()
-	options := f.opts
-
-	for _, opt := range opts {
-		opt(&options)
-	}
-
-	sopts := []StateOption{StateDryRun(options.DryRun)}
-
-	cstate := options.Initial
-	states := make(map[string]StateFunc, len(f.statesMap))
-	for k, v := range f.statesMap {
-		states[k] = v
-	}
-	f.current = cstate
-	f.mu.Unlock()
-
-	var s State
-	s = &state{name: cstate, body: args}
-	nstate := s.Name()
-
-	for {
-		select {
-		case <-ctx.Done():
-			return nil, ctx.Err()
-		default:
-			fn, ok := states[nstate]
-			if !ok {
-				return nil, fmt.Errorf(`state "%s" %w`, nstate, ErrInvalidState)
-			}
-			f.mu.Lock()
-			f.current = nstate
-			f.mu.Unlock()
-
-			// wrap the handler func
-			for i := len(options.Wrappers); i > 0; i-- {
-				fn = options.Wrappers[i-1](fn)
-			}
-
-			s, err = fn(ctx, s, sopts...)
-
-			switch {
-			case err != nil:
-				return s.Body(), err
-			case s.Name() == StateEnd:
-				return s.Body(), nil
-			case s.Name() == "":
-				for idx := range f.statesOrder {
-					if f.statesOrder[idx] == nstate && len(f.statesOrder) > idx+1 {
-						nstate = f.statesOrder[idx+1]
-					}
-				}
-			default:
-				nstate = s.Name()
-			}
-		}
-	}
-}

fsm/fsm.go

@@ -1,29 +0,0 @@
-package fsm // import "go.unistack.org/micro/v4/fsm"
-
-import (
-	"context"
-	"errors"
-)
-
-var (
-	ErrInvalidState = errors.New("does not exists")
-	StateEnd        = "end"
-)
-
-type State interface {
-	Name() string
-	Body() interface{}
-}
-
-// StateWrapper wraps the StateFunc and returns the equivalent
-type StateWrapper func(StateFunc) StateFunc
-
-// StateFunc called on state transition and return next step and error
-type StateFunc func(ctx context.Context, state State, opts ...StateOption) (State, error)
-
-type FSM interface {
-	Start(context.Context, interface{}, ...Option) (interface{}, error)
-	Current() string
-	Reset()
-	State(string, StateFunc)
-}

fsm/fsm_test.go

@@ -1,72 +0,0 @@
-package fsm
-
-import (
-	"context"
-	"fmt"
-	"testing"
-
-	"go.unistack.org/micro/v4/logger"
-)
-
-func TestFSMStart(t *testing.T) {
-	ctx := context.TODO()
-
-	if err := logger.DefaultLogger.Init(); err != nil {
-		t.Fatal(err)
-	}
-
-	wrapper := func(next StateFunc) StateFunc {
-		return func(sctx context.Context, s State, opts ...StateOption) (State, error) {
-			sctx = logger.NewContext(sctx, logger.Attrs("state", s.Name()))
-			return next(sctx, s, opts...)
-		}
-	}
-
-	f := NewFSM(InitialState("1"), WrapState(wrapper))
-	f1 := func(sctx context.Context, s State, opts ...StateOption) (State, error) {
-		_, ok := logger.FromContext(sctx)
-		if !ok {
-			t.Fatal("f1 context does not have logger")
-		}
-		args := s.Body().(map[string]interface{})
-		if v, ok := args["request"].(string); !ok || v == "" {
-			return nil, fmt.Errorf("empty request")
-		}
-		return &state{name: "", body: map[string]interface{}{"response": "state1"}}, nil
-	}
-	f2 := func(sctx context.Context, s State, opts ...StateOption) (State, error) {
-		_, ok := logger.FromContext(sctx)
-		if !ok {
-			t.Fatal("f2 context does not have logger")
-		}
-		args := s.Body().(map[string]interface{})
-		if v, ok := args["response"].(string); !ok || v == "" {
-			return nil, fmt.Errorf("empty response")
-		}
-		return &state{name: "", body: map[string]interface{}{"response": "state2"}}, nil
-	}
-	f3 := func(sctx context.Context, s State, opts ...StateOption) (State, error) {
-		_, ok := logger.FromContext(sctx)
-		if !ok {
-			t.Fatal("f3 context does not have logger")
-		}
-		args := s.Body().(map[string]interface{})
-		if v, ok := args["response"].(string); !ok || v == "" {
-			return nil, fmt.Errorf("empty response")
-		}
-		return &state{name: StateEnd, body: map[string]interface{}{"response": "state3"}}, nil
-	}
-	f.State("1", f1)
-	f.State("2", f2)
-	f.State("3", f3)
-	rsp, err := f.Start(ctx, map[string]interface{}{"request": "state"})
-	if err != nil {
-		t.Fatal(err)
-	}
-	args := rsp.(map[string]interface{})
-	if v, ok := args["response"].(string); !ok || v == "" {
-		t.Fatalf("nil rsp: %#+v", args)
-	} else if v != "state3" {
-		t.Fatalf("invalid rsp %#+v", args)
-	}
-}