Merge pull request 'add defaultConfigService' (#133) from devstigneev/micro-client-grpc:issue_132 into master

Reviewed-on: #133

.github/dependabot.yml

@@ -0,0 +1,19 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+
+  # Maintain dependencies for Golang
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/stale.sh

@@ -1,13 +0,0 @@
-#!/bin/bash -ex
-
-export PATH=$PATH:$(pwd)/bin
-export GO111MODULE=on
-export GOBIN=$(pwd)/bin
-
-#go get github.com/rvflash/goup@v0.4.1
-
-#goup -v ./...
-#go get github.com/psampaz/go-mod-outdated@v0.6.0
-go list -u -m -mod=mod -json all | go-mod-outdated -update -direct -ci || true
-
-#go list -u -m -json all | go-mod-outdated -update

.github/workflows/autoapprove.yml

@@ -0,0 +1,20 @@
+name: "autoapprove"
+
+on:
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
+
+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/workflows/automerge.yml

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

.github/workflows/build.yml

@@ -3,19 +3,20 @@ on:
  push:
     branches:
     - master
+    - v3
 jobs:
   test:
     name: test
     runs-on: ubuntu-latest
     steps:
     - name: setup
-      uses: actions/setup-go@v1
+      uses: actions/setup-go@v3
       with:
-        go-version: 1.15
+        go-version: 1.17
     - name: checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: cache
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
@@ -31,9 +32,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: lint
-        uses: golangci/golangci-lint-action@v1
+        uses: golangci/golangci-lint-action@v3.4.0
         continue-on-error: true
         with:
           # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.

.github/workflows/codeql-analysis.yml

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

.github/workflows/dependabot-automerge.yml

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

.github/workflows/pr.yml

@@ -3,19 +3,20 @@ on:
   pull_request:
     branches:
     - master
+    - v3
 jobs:
   test:
     name: test
     runs-on: ubuntu-latest
     steps:
     - name: setup
-      uses: actions/setup-go@v1
+      uses: actions/setup-go@v3
       with:
-        go-version: 1.15
+        go-version: 1.17
     - name: checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: cache
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
@@ -31,9 +32,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: lint
-        uses: golangci/golangci-lint-action@v1
+        uses: golangci/golangci-lint-action@v3.4.0
         continue-on-error: true
         with:
           # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.

.gitignore

@@ -0,0 +1,24 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+bin
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
+
+# General
+.DS_Store
+.idea
+.vscode

.golangci.yml

@@ -0,0 +1,44 @@
+run:
+  concurrency: 4
+  deadline: 5m
+  issues-exit-code: 1
+  tests: true
+
+linters-settings:
+  govet:
+    check-shadowing: true
+    enable:
+      - fieldalignment
+
+linters:
+  enable:
+    - govet
+    - deadcode
+    - errcheck
+    - govet
+    - ineffassign
+    - staticcheck
+    - structcheck
+    - typecheck
+    - unused
+    - varcheck
+    - bodyclose
+    - gci
+    - goconst
+    - gocritic
+    - gosimple
+    - gofmt
+    - gofumpt
+    - goimports
+    - golint
+    - gosec
+    - makezero
+    - misspell
+    - nakedret
+    - nestif
+    - nilerr
+    - noctx
+    - prealloc
+    - unconvert
+    - unparam
+  disable-all: false

LICENSE

@@ -0,0 +1,192 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
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+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
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+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
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+      Work and such Derivative Works in Source or Object form.
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+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
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+      where such license applies only to those patent claims licensable
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+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   Copyright 2015-2020 Asim Aslam.
+   Copyright 2019-2020 Unistack LLC.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   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.

README.md

@@ -1,25 +0,0 @@
-# GRPC Client
-
-The grpc client is a [micro.Client](https://godoc.org/github.com/micro/go-micro/client#Client) compatible client.
-
-## Overview
-
-The client makes use of the [google.golang.org/grpc](google.golang.org/grpc) framework for the underlying communication mechanism.
-
-## Usage
-
-Specify the client to your micro service
-
-```go
-import (
-	"github.com/micro/go-micro"
-	"github.com/micro/go-plugins/client/grpc"
-)
-
-func main() {
-	service := micro.NewService(
-		micro.Name("greeter"),
-		micro.Client(grpc.NewClient()),
-	)
-}
-```

codec.go

@@ -1,231 +1,127 @@
 package grpc
 
 import (
-	b "bytes"
+	"io"
-	"encoding/json"
-	"fmt"
-	"strings"
 
-	oldjsonpb "github.com/golang/protobuf/jsonpb"
+	"go.unistack.org/micro/v3/codec"
-	oldproto "github.com/golang/protobuf/proto"
-	bytes "github.com/unistack-org/micro-codec-bytes"
-	"github.com/unistack-org/micro/v3/codec"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/encoding"
-	jsonpb "google.golang.org/protobuf/encoding/protojson"
-	"google.golang.org/protobuf/proto"
 )
 
-type jsonCodec struct{}
-type protoCodec struct{}
-type bytesCodec struct{}
-type wrapCodec struct{ encoding.Codec }
-
-var jsonpbMarshaler = &jsonpb.MarshalOptions{}
-var oldjsonpbMarshaler = &oldjsonpb.Marshaler{}
-var useNumber bool
-
 var (
-	defaultGRPCCodecs = map[string]encoding.Codec{
+	_ encoding.Codec = &wrapMicroCodec{}
-		"application/json":         jsonCodec{},
+	_ codec.Codec    = &wrapGrpcCodec{}
-		"application/proto":        protoCodec{},
-		"application/protobuf":     protoCodec{},
-		"application/octet-stream": protoCodec{},
-		"application/grpc":         protoCodec{},
-		"application/grpc+json":    jsonCodec{},
-		"application/grpc+proto":   protoCodec{},
-		"application/grpc+bytes":   bytesCodec{},
-	}
 )
 
-// UseNumber fix unmarshal Number(8234567890123456789) to interface(8.234567890123457e+18)
+type wrapStream struct{ grpc.ClientStream }
-func UseNumber() {
+
-	useNumber = true
+func (w *wrapStream) Write(d []byte) (int, error) {
+	n := len(d)
+	err := w.ClientStream.SendMsg(&codec.Frame{Data: d})
+	return n, err
 }
 
-func (w wrapCodec) String() string {
+func (w *wrapStream) Read(d []byte) (int, error) {
+	m := &codec.Frame{}
+	err := w.ClientStream.RecvMsg(m)
+	copy(d, m.Data)
+	return len(d), err
+}
+
+type wrapMicroCodec struct{ codec.Codec }
+
+func (w *wrapMicroCodec) Name() string {
+	return w.Codec.String()
+}
+
+func (w *wrapMicroCodec) Marshal(v interface{}) ([]byte, error) {
+	return w.Codec.Marshal(v)
+}
+
+func (w *wrapMicroCodec) Unmarshal(d []byte, v interface{}) error {
+	return w.Codec.Unmarshal(d, v)
+}
+
+type wrapGrpcCodec struct{ encoding.Codec }
+
+func (w *wrapGrpcCodec) String() string {
 	return w.Codec.Name()
 }
 
-func (w wrapCodec) Marshal(v interface{}) ([]byte, error) {
+func (w *wrapGrpcCodec) Marshal(v interface{}, opts ...codec.Option) ([]byte, error) {
-	switch m := v.(type) {
+	if m, ok := v.(*codec.Frame); ok {
-	case *bytes.Frame:
 		return m.Data, nil
 	}
 	return w.Codec.Marshal(v)
 }
 
-func (w wrapCodec) Unmarshal(data []byte, v interface{}) error {
+func (w *wrapGrpcCodec) Unmarshal(d []byte, v interface{}, opts ...codec.Option) error {
-	if len(data) == 0 {
+	if d == nil || v == nil {
 		return nil
 	}
-	if v == nil {
+	if m, ok := v.(*codec.Frame); ok {
+		m.Data = d
 		return nil
 	}
-	switch m := v.(type) {
+	return w.Codec.Unmarshal(d, v)
-	case *bytes.Frame:
-		m.Data = data
-		return nil
-	}
-	return w.Codec.Unmarshal(data, v)
-}
-
-func (protoCodec) Marshal(v interface{}) ([]byte, error) {
-	switch m := v.(type) {
-	case *bytes.Frame:
-		return m.Data, nil
-	case proto.Message:
-		return proto.Marshal(m)
-	case oldproto.Message:
-		return oldproto.Marshal(m)
-	}
-	return nil, fmt.Errorf("failed to marshal: %v is not type of *bytes.Frame or proto.Message", v)
-}
-
-func (protoCodec) Unmarshal(data []byte, v interface{}) error {
-	if len(data) == 0 {
-		return nil
-	}
-	if v == nil {
-		return nil
-	}
-	switch m := v.(type) {
-	case *bytes.Frame:
-		m.Data = data
-		return nil
-	case proto.Message:
-		return proto.Unmarshal(data, m)
-	case oldproto.Message:
-		return oldproto.Unmarshal(data, m)
-	}
-	return fmt.Errorf("failed to unmarshal: %v is not type of *bytes.Frame or proto.Message", v)
-}
-
-func (protoCodec) Name() string {
-	return "proto"
-}
-
-func (bytesCodec) Marshal(v interface{}) ([]byte, error) {
-	switch m := v.(type) {
-	case *[]byte:
-		return *m, nil
-	}
-	return nil, fmt.Errorf("failed to marshal: %v is not type of *[]byte", v)
-}
-
-func (bytesCodec) Unmarshal(data []byte, v interface{}) error {
-	if len(data) == 0 {
-		return nil
-	}
-	if v == nil {
-		return nil
-	}
-	switch m := v.(type) {
-	case *[]byte:
-		*m = data
-		return nil
-	}
-	return fmt.Errorf("failed to unmarshal: %v is not type of *[]byte", v)
-}
-
-func (bytesCodec) Name() string {
-	return "bytes"
-}
-
-func (jsonCodec) Marshal(v interface{}) ([]byte, error) {
-	switch m := v.(type) {
-	case *bytes.Frame:
-		return m.Data, nil
-	case proto.Message:
-		return jsonpbMarshaler.Marshal(m)
-	case oldproto.Message:
-		buf, err := oldjsonpbMarshaler.MarshalToString(m)
-		return []byte(buf), err
-	}
-
-	return json.Marshal(v)
-}
-
-func (jsonCodec) Unmarshal(data []byte, v interface{}) error {
-	if len(data) == 0 {
-		return nil
-	}
-	if v == nil {
-		return nil
-	}
-	switch m := v.(type) {
-	case *bytes.Frame:
-		m.Data = data
-		return nil
-	case proto.Message:
-		return jsonpb.Unmarshal(data, m)
-	case oldproto.Message:
-		return oldjsonpb.Unmarshal(b.NewReader(data), m)
-	}
-	dec := json.NewDecoder(b.NewReader(data))
-	if useNumber {
-		dec.UseNumber()
-	}
-	return dec.Decode(v)
-}
-
-func (jsonCodec) Name() string {
-	return "json"
 }
 
+/*
 type grpcCodec struct {
+	grpc.ServerStream
 	// headers
 	id       string
 	target   string
 	method   string
 	endpoint string
 
-	s grpc.ClientStream
 	c encoding.Codec
 }
 
-func (g *grpcCodec) ReadHeader(m *codec.Message, mt codec.MessageType) error {
+*/
-	md, err := g.s.Header()
+
-	if err != nil {
+func (w *wrapGrpcCodec) ReadHeader(conn io.Reader, m *codec.Message, mt codec.MessageType) error {
-		return err
+	/*
-	}
 		if m == nil {
-		m = new(codec.Message)
+			m = codec.NewMessage(codec.Request)
 		}
+
+		if md, ok := metadata.FromIncomingContext(g.ServerStream.Context()); ok {
 			if m.Header == nil {
-		m.Header = make(map[string]string, len(md))
+				m.Header = meta.New(len(md))
 			}
 			for k, v := range md {
 				m.Header[k] = strings.Join(v, ",")
 			}
+		}
+
 		m.Id = g.id
 		m.Target = g.target
 		m.Method = g.method
 		m.Endpoint = g.endpoint
+	*/
 	return nil
 }
 
-func (g *grpcCodec) ReadBody(v interface{}) error {
+func (w *wrapGrpcCodec) ReadBody(conn io.Reader, v interface{}) error {
-	switch m := v.(type) {
+	// caller has requested a frame
-	case *bytes.Frame:
+	if m, ok := v.(*codec.Frame); ok {
-		return g.s.RecvMsg(m)
+		_, err := conn.Read(m.Data)
+		return err
 	}
-	return g.s.RecvMsg(v)
+	return codec.ErrInvalidMessage
 }
 
-func (g *grpcCodec) Write(m *codec.Message, v interface{}) error {
+func (w *wrapGrpcCodec) Write(conn io.Writer, m *codec.Message, v interface{}) error {
 	// if we don't have a body
 	if v != nil {
-		return g.s.SendMsg(v)
+		b, err := w.Marshal(v)
+		if err != nil {
+			return err
+		}
+		m.Body = b
 	}
 	// write the body using the framing codec
-	return g.s.SendMsg(&bytes.Frame{Data: m.Body})
+	_, err := conn.Write(m.Body)
-}
+	return err
-
-func (g *grpcCodec) Close() error {
-	return g.s.CloseSend()
-}
-
-func (g *grpcCodec) String() string {
-	return g.c.Name()
 }

error.go

@@ -1,8 +1,7 @@
 package grpc
 
 import (
-	pberr "github.com/unistack-org/micro-client-grpc/errors"
+	"go.unistack.org/micro/v3/errors"
-	"github.com/unistack-org/micro/v3/errors"
 	"google.golang.org/grpc/status"
 )
 
@@ -10,35 +9,46 @@ func microError(err error) error {
 	// no error
 
 	if err == nil {
+		// nothing to do
 		return nil
 	}
 
 	if verr, ok := err.(*errors.Error); ok {
+		// micro error
 		return verr
 	}
 
-	if verr, ok := err.(*pberr.Error); ok {
-		return &errors.Error{Id: verr.Id, Code: verr.Code, Detail: verr.Detail, Status: verr.Status}
-	}
-
 	// grpc error
 	s, ok := status.FromError(err)
 	if !ok {
+		// can't get status detals from grpc error, return base error
 		return err
 	}
 
-	// return first error from details
+	details := s.Details()
-	if details := s.Details(); len(details) > 0 {
+	switch len(details) {
-		if verr, ok := details[0].(error); ok {
+	case 0:
-			return microError(verr)
+		if verr := errors.Parse(s.Message()); verr.Code > 0 {
+			// return micro error
+			return verr
 		}
+		// return base error as it not micro error
+		return err
+	case 1:
+		if verr, ok := details[0].(*errors.Error); ok {
+			// return nested micro error
+			return verr
+		}
+		// return base error as it not holds micro error
+		return err
 	}
 
-	// try to decode micro *errors.Error
+	// attached messages in details more then 1, try to fallback to micro error
-	if e := errors.Parse(s.Message()); e.Code > 0 {
+	if verr := errors.Parse(s.Message()); verr.Code > 0 {
-		return e // actually a micro error
+		// return micro error
+		return verr
 	}
 
-	// fallback
+	// not micro error return base error
-	return errors.InternalServerError("go.micro.client", s.Message())
+	return err
 }

errors/errors.go

@@ -1,159 +0,0 @@
-package errors
-
-import (
-	"fmt"
-)
-
-func (e *Error) Error() string {
-	return fmt.Sprintf(`{"id":"%s","code":%d,"detail":"%s","status":"%s"}`, e.Id, e.Code, e.Detail, e.Status)
-}
-
-// New generates a custom error.
-func New(id, detail string, code int32) error {
-	return &Error{
-		Id:     id,
-		Code:   code,
-		Detail: detail,
-		//	Status: http.StatusText(int(code)),
-	}
-}
-
-// BadRequest generates a 400 error.
-func BadRequest(id, format string, a ...interface{}) error {
-	return &Error{
-		Id:     id,
-		Code:   400,
-		Detail: fmt.Sprintf(format, a...),
-		//		Status: http.StatusText(400),
-	}
-}
-
-// Unauthorized generates a 401 error.
-func Unauthorized(id, format string, a ...interface{}) error {
-	return &Error{
-		Id:     id,
-		Code:   401,
-		Detail: fmt.Sprintf(format, a...),
-		//		Status: http.StatusText(401),
-	}
-}
-
-// Forbidden generates a 403 error.
-func Forbidden(id, format string, a ...interface{}) error {
-	return &Error{
-		Id:     id,
-		Code:   403,
-		Detail: fmt.Sprintf(format, a...),
-		//		Status: http.StatusText(403),
-	}
-}
-
-// NotFound generates a 404 error.
-func NotFound(id, format string, a ...interface{}) error {
-	return &Error{
-		Id:     id,
-		Code:   404,
-		Detail: fmt.Sprintf(format, a...),
-		//	Status: http.StatusText(404),
-	}
-}
-
-// MethodNotAllowed generates a 405 error.
-func MethodNotAllowed(id, format string, a ...interface{}) error {
-	return &Error{
-		Id:     id,
-		Code:   405,
-		Detail: fmt.Sprintf(format, a...),
-		//Status: http.StatusText(405),
-	}
-}
-
-// Timeout generates a 408 error.
-func Timeout(id, format string, a ...interface{}) error {
-	return &Error{
-		Id:     id,
-		Code:   408,
-		Detail: fmt.Sprintf(format, a...),
-		//Status: http.StatusText(408),
-	}
-}
-
-// Conflict generates a 409 error.
-func Conflict(id, format string, a ...interface{}) error {
-	return &Error{
-		Id:     id,
-		Code:   409,
-		Detail: fmt.Sprintf(format, a...),
-		//Status: http.StatusText(409),
-	}
-}
-
-// InternalServerError generates a 500 error.
-func InternalServerError(id, format string, a ...interface{}) error {
-	return &Error{
-		Id:     id,
-		Code:   500,
-		Detail: fmt.Sprintf(format, a...),
-		//Status: http.StatusText(500),
-	}
-}
-
-// NotImplemented generates a 501 error
-func NotImplemented(id, format string, a ...interface{}) error {
-	return &Error{
-		Id:     id,
-		Code:   501,
-		Detail: fmt.Sprintf(format, a...),
-		//Status: http.StatusText(501),
-	}
-}
-
-// BadGateway generates a 502 error
-func BadGateway(id, format string, a ...interface{}) error {
-	return &Error{
-		Id:     id,
-		Code:   502,
-		Detail: fmt.Sprintf(format, a...),
-		//	Status: http.StatusText(502),
-	}
-}
-
-// ServiceUnavailable generates a 503 error
-func ServiceUnavailable(id, format string, a ...interface{}) error {
-	return &Error{
-		Id:     id,
-		Code:   503,
-		Detail: fmt.Sprintf(format, a...),
-		//Status: http.StatusText(503),
-	}
-}
-
-// GatewayTimeout generates a 504 error
-func GatewayTimeout(id, format string, a ...interface{}) error {
-	return &Error{
-		Id:     id,
-		Code:   504,
-		Detail: fmt.Sprintf(format, a...),
-		//Status: http.StatusText(504),
-	}
-}
-
-// Equal tries to compare errors
-func Equal(err1 error, err2 error) bool {
-	verr1, ok1 := err1.(*Error)
-	verr2, ok2 := err2.(*Error)
-
-	if ok1 != ok2 {
-		return false
-	}
-
-	if !ok1 {
-		return err1 == err2
-	}
-
-	if verr1.Code != verr2.Code {
-		return false
-	}
-
-	return true
-}

errors/errors.pb.go

@@ -1,176 +0,0 @@
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// versions:
-// 	protoc-gen-go v1.25.0-devel
-// 	protoc        v3.6.1
-// source: errors.proto
-
-package errors
-
-import (
-	proto "github.com/golang/protobuf/proto"
-	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
-	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
-	reflect "reflect"
-	sync "sync"
-)
-
-const (
-	// Verify that this generated code is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
-	// Verify that runtime/protoimpl is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
-)
-
-// This is a compile-time assertion that a sufficiently up-to-date version
-// of the legacy proto package is being used.
-const _ = proto.ProtoPackageIsVersion4
-
-type Error struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Id     string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
-	Code   int32  `protobuf:"varint,2,opt,name=code,proto3" json:"code,omitempty"`
-	Detail string `protobuf:"bytes,3,opt,name=detail,proto3" json:"detail,omitempty"`
-	Status string `protobuf:"bytes,4,opt,name=status,proto3" json:"status,omitempty"`
-}
-
-func (x *Error) Reset() {
-	*x = Error{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_errors_proto_msgTypes[0]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *Error) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*Error) ProtoMessage() {}
-
-func (x *Error) ProtoReflect() protoreflect.Message {
-	mi := &file_errors_proto_msgTypes[0]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use Error.ProtoReflect.Descriptor instead.
-func (*Error) Descriptor() ([]byte, []int) {
-	return file_errors_proto_rawDescGZIP(), []int{0}
-}
-
-func (x *Error) GetId() string {
-	if x != nil {
-		return x.Id
-	}
-	return ""
-}
-
-func (x *Error) GetCode() int32 {
-	if x != nil {
-		return x.Code
-	}
-	return 0
-}
-
-func (x *Error) GetDetail() string {
-	if x != nil {
-		return x.Detail
-	}
-	return ""
-}
-
-func (x *Error) GetStatus() string {
-	if x != nil {
-		return x.Status
-	}
-	return ""
-}
-
-var File_errors_proto protoreflect.FileDescriptor
-
-var file_errors_proto_rawDesc = []byte{
-	0x0a, 0x0c, 0x65, 0x72, 0x72, 0x6f, 0x72, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x25,
-	0x6f, 0x72, 0x67, 0x2e, 0x75, 0x6e, 0x69, 0x73, 0x74, 0x61, 0x63, 0x6b, 0x2e, 0x6d, 0x69, 0x63,
-	0x72, 0x6f, 0x2e, 0x63, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x65,
-	0x72, 0x72, 0x6f, 0x72, 0x73, 0x22, 0x5b, 0x0a, 0x05, 0x45, 0x72, 0x72, 0x6f, 0x72, 0x12, 0x0e,
-	0x0a, 0x02, 0x69, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x02, 0x69, 0x64, 0x12, 0x12,
-	0x0a, 0x04, 0x63, 0x6f, 0x64, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x05, 0x52, 0x04, 0x63, 0x6f,
-	0x64, 0x65, 0x12, 0x16, 0x0a, 0x06, 0x64, 0x65, 0x74, 0x61, 0x69, 0x6c, 0x18, 0x03, 0x20, 0x01,
-	0x28, 0x09, 0x52, 0x06, 0x64, 0x65, 0x74, 0x61, 0x69, 0x6c, 0x12, 0x16, 0x0a, 0x06, 0x73, 0x74,
-	0x61, 0x74, 0x75, 0x73, 0x18, 0x04, 0x20, 0x01, 0x28, 0x09, 0x52, 0x06, 0x73, 0x74, 0x61, 0x74,
-	0x75, 0x73, 0x42, 0x0a, 0x5a, 0x08, 0x2e, 0x3b, 0x65, 0x72, 0x72, 0x6f, 0x72, 0x73, 0x62, 0x06,
-	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
-}
-
-var (
-	file_errors_proto_rawDescOnce sync.Once
-	file_errors_proto_rawDescData = file_errors_proto_rawDesc
-)
-
-func file_errors_proto_rawDescGZIP() []byte {
-	file_errors_proto_rawDescOnce.Do(func() {
-		file_errors_proto_rawDescData = protoimpl.X.CompressGZIP(file_errors_proto_rawDescData)
-	})
-	return file_errors_proto_rawDescData
-}
-
-var file_errors_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
-var file_errors_proto_goTypes = []interface{}{
-	(*Error)(nil), // 0: org.unistack.micro.client.grpc.errors.Error
-}
-var file_errors_proto_depIdxs = []int32{
-	0, // [0:0] is the sub-list for method output_type
-	0, // [0:0] is the sub-list for method input_type
-	0, // [0:0] is the sub-list for extension type_name
-	0, // [0:0] is the sub-list for extension extendee
-	0, // [0:0] is the sub-list for field type_name
-}
-
-func init() { file_errors_proto_init() }
-func file_errors_proto_init() {
-	if File_errors_proto != nil {
-		return
-	}
-	if !protoimpl.UnsafeEnabled {
-		file_errors_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Error); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-	}
-	type x struct{}
-	out := protoimpl.TypeBuilder{
-		File: protoimpl.DescBuilder{
-			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: file_errors_proto_rawDesc,
-			NumEnums:      0,
-			NumMessages:   1,
-			NumExtensions: 0,
-			NumServices:   0,
-		},
-		GoTypes:           file_errors_proto_goTypes,
-		DependencyIndexes: file_errors_proto_depIdxs,
-		MessageInfos:      file_errors_proto_msgTypes,
-	}.Build()
-	File_errors_proto = out.File
-	file_errors_proto_rawDesc = nil
-	file_errors_proto_goTypes = nil
-	file_errors_proto_depIdxs = nil
-}

errors/errors.pb.micro.go

@@ -1,21 +0,0 @@
-// Code generated by protoc-gen-micro. DO NOT EDIT.
-// source: errors.proto
-
-package errors
-
-import (
-	fmt "fmt"
-	proto "github.com/golang/protobuf/proto"
-	math "math"
-)
-
-// Reference imports to suppress errors if they are not otherwise used.
-var _ = proto.Marshal
-var _ = fmt.Errorf
-var _ = math.Inf
-
-// This is a compile-time assertion to ensure that this generated file
-// is compatible with the proto package it is being compiled against.
-// A compilation error at this line likely means your copy of the
-// proto package needs to be updated.
-const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package

errors/errors.proto

@@ -1,11 +0,0 @@
-syntax = "proto3";
-
-option go_package = ".;errors";
-package org.unistack.micro.client.grpc.errors;
-
-message Error {
-  string id = 1;
-  int32 code = 2;
-  string detail = 3;
-  string status = 4;
-};

generate.go

@@ -1,3 +0,0 @@
-package grpc
-
-//go:generate protoc -I./errors -I. --go-grpc_out=paths=source_relative:./errors --go_out=paths=source_relative:./errors --micro_out=paths=source_relative:./errors errors/errors.proto

go.mod

@@ -1,15 +1,8 @@
-module github.com/unistack-org/micro-client-grpc
+module go.unistack.org/micro-client-grpc/v3
 
-go 1.15
+go 1.16
 
 require (
-	github.com/golang/protobuf v1.4.2
+	go.unistack.org/micro/v3 v3.10.22
-	github.com/google/go-cmp v0.5.1 // indirect
+	google.golang.org/grpc v1.52.3
-	github.com/unistack-org/micro-codec-bytes v0.0.0-20200828083432-4e49e953d844
-	github.com/unistack-org/micro/v3 v3.0.0-gamma.0.20200920124807-9b11ea527aeb
-	golang.org/x/sys v0.0.0-20200803210538-64077c9b5642 // indirect
-	golang.org/x/text v0.3.3 // indirect
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
-	google.golang.org/grpc v1.31.1
-	google.golang.org/protobuf v1.25.0
 )

grpc.go

@@ -1,57 +1,52 @@
 // Package grpc provides a gRPC client
-package grpc
+package grpc // import "go.unistack.org/micro-client-grpc/v3"
 
 import (
 	"context"
 	"crypto/tls"
 	"fmt"
 	"net"
+	"os"
 	"reflect"
 	"strings"
 	"sync"
-	"sync/atomic"
 	"time"
 
-	raw "github.com/unistack-org/micro-codec-bytes"
+	"go.unistack.org/micro/v3/broker"
-	"github.com/unistack-org/micro/v3/broker"
+	"go.unistack.org/micro/v3/client"
-	"github.com/unistack-org/micro/v3/client"
+	"go.unistack.org/micro/v3/codec"
-	"github.com/unistack-org/micro/v3/errors"
+	"go.unistack.org/micro/v3/errors"
-	"github.com/unistack-org/micro/v3/metadata"
+	"go.unistack.org/micro/v3/metadata"
-
+	"go.unistack.org/micro/v3/selector"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/credentials/insecure"
 	"google.golang.org/grpc/encoding"
 	gmetadata "google.golang.org/grpc/metadata"
 )
 
-type grpcClient struct {
+const (
-	opts   client.Options
+	DefaultContentType = "application/grpc"
-	codecs map[string]encoding.Codec
+)
-	pool   *pool
-	once   atomic.Value
-	sync.RWMutex
-}
 
-func init() {
+type grpcClient struct {
-	encoding.RegisterCodec(wrapCodec{jsonCodec{}})
+	pool *ConnPool
-	encoding.RegisterCodec(wrapCodec{protoCodec{}})
+	opts client.Options
-	encoding.RegisterCodec(wrapCodec{bytesCodec{}})
+	sync.RWMutex
+	init bool
 }
 
 // secure returns the dial option for whether its a secure or insecure connection
 func (g *grpcClient) secure(addr string) grpc.DialOption {
 	// first we check if theres'a  tls config
-	if g.opts.Context != nil {
+	if g.opts.TLSConfig != nil {
-		if v := g.opts.Context.Value(tlsAuth{}); v != nil {
+		creds := credentials.NewTLS(g.opts.TLSConfig)
-			tls := v.(*tls.Config)
-			creds := credentials.NewTLS(tls)
 		// return tls config if it exists
 		return grpc.WithTransportCredentials(creds)
 	}
-	}
 
 	// default config
-	tlsConfig := &tls.Config{}
+	tlsConfig := &tls.Config{MinVersion: tls.VersionTLS12}
 	defaultCreds := grpc.WithTransportCredentials(credentials.NewTLS(tlsConfig))
 
 	// check if the address is prepended with https
@@ -69,37 +64,41 @@ func (g *grpcClient) secure(addr string) grpc.DialOption {
 	}
 
 	// other fallback to insecure
-	return grpc.WithInsecure()
+	return grpc.WithTransportCredentials(insecure.NewCredentials())
 }
 
 func (g *grpcClient) call(ctx context.Context, addr string, req client.Request, rsp interface{}, opts client.CallOptions) error {
 	var header map[string]string
 
-	header = make(map[string]string)
+	if md, ok := metadata.FromOutgoingContext(ctx); ok {
-	if md, ok := metadata.FromContext(ctx); ok {
 		header = make(map[string]string, len(md))
 		for k, v := range md {
 			header[strings.ToLower(k)] = v
 		}
 	} else {
-		header = make(map[string]string)
+		header = make(map[string]string, 2)
+	}
+	if opts.RequestMetadata != nil {
+		for k, v := range opts.RequestMetadata {
+			header[k] = v
+		}
 	}
-
 	// set timeout in nanoseconds
-	header["timeout"] = fmt.Sprintf("%d", opts.RequestTimeout)
+	header["Grpc-Timeout"] = fmt.Sprintf("%dn", opts.RequestTimeout)
-	// set the content type for the request
+	header["timeout"] = fmt.Sprintf("%dn", opts.RequestTimeout)
-	header["x-content-type"] = req.ContentType()
+	header["content-type"] = req.ContentType()
 
 	md := gmetadata.New(header)
 	ctx = gmetadata.NewOutgoingContext(ctx, md)
 
-	cf, err := g.newGRPCCodec(req.ContentType())
+	cf, err := g.newCodec(req.ContentType())
 	if err != nil {
 		return errors.InternalServerError("go.micro.client", err.Error())
 	}
 
 	maxRecvMsgSize := g.maxRecvMsgSizeValue()
 	maxSendMsgSize := g.maxSendMsgSizeValue()
+	cfgService := g.serviceConfig()
 
 	var grr error
 
@@ -118,30 +117,47 @@ func (g *grpcClient) call(ctx context.Context, addr string, req client.Request,
 			grpc.MaxCallRecvMsgSize(maxRecvMsgSize),
 			grpc.MaxCallSendMsgSize(maxSendMsgSize),
 		),
+		grpc.WithDefaultServiceConfig(cfgService),
 	}
 
-	if opts := g.getGrpcDialOptions(); opts != nil {
+	if opts := g.getGrpcDialOptions(opts.Context); opts != nil {
 		grpcDialOptions = append(grpcDialOptions, opts...)
 	}
 
-	cc, err := g.pool.getConn(dialCtx, addr, grpcDialOptions...)
+	contextDialer := g.opts.ContextDialer
+	if opts.ContextDialer != nil {
+		contextDialer = opts.ContextDialer
+	}
+	if contextDialer != nil {
+		grpcDialOptions = append(grpcDialOptions, grpc.WithContextDialer(contextDialer))
+	}
+
+	cc, err := g.pool.Get(dialCtx, addr, grpcDialOptions...)
 	if err != nil {
 		return errors.InternalServerError("go.micro.client", fmt.Sprintf("Error sending request: %v", err))
 	}
 	defer func() {
 		// defer execution of release
-		g.pool.release(addr, cc, grr)
+		g.pool.Put(cc, grr)
 	}()
 
 	ch := make(chan error, 1)
+	var gmd gmetadata.MD
 
-	go func() {
 	grpcCallOptions := []grpc.CallOption{
-			grpc.ForceCodec(cf),
+		grpc.CallContentSubtype((&wrapMicroCodec{cf}).Name()),
-			grpc.CallContentSubtype(cf.Name())}
+	}
-		if opts := g.getGrpcCallOptions(); opts != nil {
+
+	if opts := g.getGrpcCallOptions(opts.Context); opts != nil {
 		grpcCallOptions = append(grpcCallOptions, opts...)
 	}
+
+	if opts.ResponseMetadata != nil {
+		gmd = gmetadata.MD{}
+		grpcCallOptions = append(grpcCallOptions, grpc.Header(&gmd))
+	}
+
+	go func() {
 		err := cc.Invoke(ctx, methodToGRPC(req.Service(), req.Endpoint()), req.Body(), rsp, grpcCallOptions...)
 		ch <- microError(err)
 	}()
@@ -153,13 +169,20 @@ func (g *grpcClient) call(ctx context.Context, addr string, req client.Request,
 		grr = errors.Timeout("go.micro.client", "%v", ctx.Err())
 	}
 
+	if opts.ResponseMetadata != nil {
+		*opts.ResponseMetadata = metadata.New(gmd.Len())
+		for k, v := range gmd {
+			opts.ResponseMetadata.Set(k, strings.Join(v, ","))
+		}
+	}
+
 	return grr
 }
 
 func (g *grpcClient) stream(ctx context.Context, addr string, req client.Request, rsp interface{}, opts client.CallOptions) error {
 	var header map[string]string
 
-	if md, ok := metadata.FromContext(ctx); ok {
+	if md, ok := metadata.FromOutgoingContext(ctx); ok {
 		header = make(map[string]string, len(md))
 		for k, v := range md {
 			header[k] = v
@@ -170,15 +193,16 @@ func (g *grpcClient) stream(ctx context.Context, addr string, req client.Request
 
 	// set timeout in nanoseconds
 	if opts.StreamTimeout > time.Duration(0) {
-		header["timeout"] = fmt.Sprintf("%d", opts.StreamTimeout)
+		header["Grpc-Timeout"] = fmt.Sprintf("%dn", opts.StreamTimeout)
+		header["timeout"] = fmt.Sprintf("%dn", opts.StreamTimeout)
 	}
 	// set the content type for the request
-	header["x-content-type"] = req.ContentType()
+	header["content-type"] = req.ContentType()
 
 	md := gmetadata.New(header)
 	ctx = gmetadata.NewOutgoingContext(ctx, md)
 
-	cf, err := g.newGRPCCodec(req.ContentType())
+	cf, err := g.newCodec(req.ContentType())
 	if err != nil {
 		return errors.InternalServerError("go.micro.client", err.Error())
 	}
@@ -192,17 +216,34 @@ func (g *grpcClient) stream(ctx context.Context, addr string, req client.Request
 	}
 	defer cancel()
 
-	wc := wrapCodec{cf}
+	wc := &wrapMicroCodec{cf}
+
+	maxRecvMsgSize := g.maxRecvMsgSizeValue()
+	maxSendMsgSize := g.maxSendMsgSizeValue()
+	cfgService := g.serviceConfig()
 
 	grpcDialOptions := []grpc.DialOption{
 		g.secure(addr),
+		grpc.WithDefaultCallOptions(
+			grpc.MaxCallRecvMsgSize(maxRecvMsgSize),
+			grpc.MaxCallSendMsgSize(maxSendMsgSize),
+		),
+		grpc.WithDefaultServiceConfig(cfgService),
 	}
 
-	if opts := g.getGrpcDialOptions(); opts != nil {
+	if opts := g.getGrpcDialOptions(opts.Context); opts != nil {
 		grpcDialOptions = append(grpcDialOptions, opts...)
 	}
 
-	cc, err := g.pool.getConn(dialCtx, addr, grpcDialOptions...)
+	contextDialer := g.opts.ContextDialer
+	if opts.ContextDialer != nil {
+		contextDialer = opts.ContextDialer
+	}
+	if contextDialer != nil {
+		grpcDialOptions = append(grpcDialOptions, grpc.WithContextDialer(contextDialer))
+	}
+
+	cc, err := g.pool.Get(dialCtx, addr, grpcDialOptions...)
 	if err != nil {
 		return errors.InternalServerError("go.micro.client", fmt.Sprintf("Error sending request: %v", err))
 	}
@@ -214,12 +255,17 @@ func (g *grpcClient) stream(ctx context.Context, addr string, req client.Request
 	}
 
 	grpcCallOptions := []grpc.CallOption{
-		grpc.ForceCodec(wc),
+		// grpc.ForceCodec(wc),
-		grpc.CallContentSubtype(cf.Name()),
+		grpc.CallContentSubtype(wc.Name()),
 	}
-	if opts := g.getGrpcCallOptions(); opts != nil {
+	if opts := g.getGrpcCallOptions(opts.Context); opts != nil {
 		grpcCallOptions = append(grpcCallOptions, opts...)
 	}
+	var gmd gmetadata.MD
+	if opts.ResponseMetadata != nil {
+		gmd = gmetadata.MD{}
+		grpcCallOptions = append(grpcCallOptions, grpc.Header(&gmd))
+	}
 
 	// create a new cancelling context
 	newCtx, cancel := context.WithCancel(ctx)
@@ -230,19 +276,14 @@ func (g *grpcClient) stream(ctx context.Context, addr string, req client.Request
 		// cancel the context
 		cancel()
 		// release the connection
-		g.pool.release(addr, cc, err)
+		g.pool.Put(cc, err)
 		// now return the error
 		return errors.InternalServerError("go.micro.client", fmt.Sprintf("Error creating stream: %v", err))
 	}
 
-	codec := &grpcCodec{
-		s: st,
-		c: wc,
-	}
-
 	// set request codec
 	if r, ok := req.(*grpcRequest); ok {
-		r.codec = codec
+		r.codec = cf
 	}
 
 	// setup the stream response
@@ -254,23 +295,23 @@ func (g *grpcClient) stream(ctx context.Context, addr string, req client.Request
 			conn:   cc,
 			stream: st,
 			codec:  cf,
-			gcodec: codec,
 		},
 		conn: cc,
 		close: func(err error) {
-			// cancel the context if an error occured
+			// cancel the context if an error occurred
 			if err != nil {
 				cancel()
 			}
 
 			// defer execution of release
-			g.pool.release(addr, cc, err)
+			g.pool.Put(cc, err)
 		},
 	}
 
 	// set the stream as the response
 	val := reflect.ValueOf(rsp).Elem()
 	val.Set(reflect.ValueOf(stream).Elem())
+
 	return nil
 }
 
@@ -318,17 +359,35 @@ func (g *grpcClient) maxSendMsgSizeValue() int {
 	return v.(int)
 }
 
-func (g *grpcClient) newGRPCCodec(contentType string) (encoding.Codec, error) {
+func (g *grpcClient) newCodec(ct string) (codec.Codec, error) {
 	g.RLock()
 	defer g.RUnlock()
 
-	if c, ok := g.codecs[contentType]; ok {
+	if idx := strings.IndexRune(ct, ';'); idx >= 0 {
-		return wrapCodec{c}, nil
+		ct = ct[:idx]
 	}
-	return nil, fmt.Errorf("Unsupported Content-Type: %s", contentType)
+
+	if c, ok := g.opts.Codecs[ct]; ok {
+		return c, nil
+	}
+	return nil, codec.ErrUnknownContentType
+}
+
+func (g *grpcClient) serviceConfig() string {
+	if g.opts.Context == nil {
+		return DefaultServiceConfig
+	}
+	v := g.opts.Context.Value(serviceConfigKey{})
+	if v == nil {
+		return DefaultServiceConfig
+	}
+	return v.(string)
 }
 
 func (g *grpcClient) Init(opts ...client.Option) error {
+	if len(opts) == 0 && g.init {
+		return nil
+	}
 	size := g.opts.PoolSize
 	ttl := g.opts.PoolTTL
 
@@ -344,6 +403,27 @@ func (g *grpcClient) Init(opts ...client.Option) error {
 		g.pool.Unlock()
 	}
 
+	if err := g.opts.Broker.Init(); err != nil {
+		return err
+	}
+	if err := g.opts.Tracer.Init(); err != nil {
+		return err
+	}
+	if err := g.opts.Router.Init(); err != nil {
+		return err
+	}
+	if err := g.opts.Logger.Init(); err != nil {
+		return err
+	}
+	if err := g.opts.Meter.Init(); err != nil {
+		return err
+	}
+	if err := g.opts.Transport.Init(); err != nil {
+		return err
+	}
+
+	g.init = true
+
 	return nil
 }
 
@@ -367,6 +447,7 @@ func (g *grpcClient) Call(ctx context.Context, req client.Request, rsp interface
 	}
 	// make a copy of call opts
 	callOpts := g.opts.CallOptions
+
 	for _, opt := range opts {
 		opt(&callOpts)
 	}
@@ -415,20 +496,8 @@ func (g *grpcClient) Call(ctx context.Context, req client.Request, rsp interface
 		callOpts.Address = []string{g.opts.Proxy}
 	}
 
-	// lookup the route to send the reques to
+	var next selector.Next
-	// TODO apply any filtering here
-	routes, err := g.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
-	}
-
-	// 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)
@@ -441,6 +510,23 @@ func (g *grpcClient) Call(ctx context.Context, req client.Request, rsp interface
 			time.Sleep(t)
 		}
 
+		if next == nil {
+			var routes []string
+
+			// lookup the route to send the reques to
+			// TODO apply any filtering here
+			routes, err = g.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
+			}
+		}
+
 		// get the next node
 		node := next()
 
@@ -532,18 +618,7 @@ func (g *grpcClient) Stream(ctx context.Context, req client.Request, opts ...cli
 		callOpts.Address = []string{g.opts.Proxy}
 	}
 
-	// lookup the route to send the reques to
+	var next selector.Next
-	// TODO: move to internal lookup func
-	routes, err := g.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
-	}
 
 	call := func(i int) (client.Stream, error) {
 		// call backoff first. Someone may want an initial start delay
@@ -557,12 +632,29 @@ func (g *grpcClient) Stream(ctx context.Context, req client.Request, opts ...cli
 			time.Sleep(t)
 		}
 
+		if next == nil {
+			var routes []string
+
+			// lookup the route to send the reques to
+			// TODO apply any filtering here
+			routes, err = g.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
+			}
+		}
+
 		// get the next node
 		node := next()
 
 		// make the call
 		stream := &grpcStream{}
-		err = g.stream(ctx, node, req, stream, callOpts)
+		err = gstream(ctx, node, req, stream, callOpts)
 
 		// record the result of the call to inform future routing decisions
 		if verr := g.opts.Selector.Record(node, err); verr != nil {
@@ -574,7 +666,10 @@ func (g *grpcClient) Stream(ctx context.Context, req client.Request, opts ...cli
 			return nil, verr
 		}
 
-		g.opts.Selector.Record(node, err)
+		if rerr := g.opts.Selector.Record(node, err); rerr != nil {
+			return nil, rerr
+		}
+
 		return stream, err
 	}
 
@@ -617,35 +712,42 @@ func (g *grpcClient) Stream(ctx context.Context, req client.Request, opts ...cli
 	return nil, grr
 }
 
+func (g *grpcClient) BatchPublish(ctx context.Context, ps []client.Message, opts ...client.PublishOption) error {
+	return g.publish(ctx, ps, opts...)
+}
+
 func (g *grpcClient) Publish(ctx context.Context, p client.Message, opts ...client.PublishOption) error {
-	var options client.PublishOptions
+	return g.publish(ctx, []client.Message{p}, opts...)
+}
+
+func (g *grpcClient) publish(ctx context.Context, ps []client.Message, opts ...client.PublishOption) error {
 	var body []byte
 
-	// fail early on connect error
+	options := client.NewPublishOptions(opts...)
-	if !g.once.Load().(bool) {
+
-		if err := g.opts.Broker.Connect(); err != nil {
+	// get proxy
-			return errors.InternalServerError("go.micro.client", err.Error())
+	exchange := ""
-		}
+	if v, ok := os.LookupEnv("MICRO_PROXY"); ok {
-		g.once.Store(true)
+		exchange = v
 	}
 
-	for _, o := range opts {
+	msgs := make([]*broker.Message, 0, len(ps))
-		o(&options)
-	}
 
-	md, ok := metadata.FromContext(ctx)
+	omd, ok := metadata.FromOutgoingContext(ctx)
 	if !ok {
-		md = make(map[string]string)
+		omd = metadata.New(2)
 	}
-	md["Content-Type"] = p.ContentType()
+
-	md["Micro-Topic"] = p.Topic()
+	for _, p := range ps {
+		md := metadata.Copy(omd)
+		md[metadata.HeaderContentType] = p.ContentType()
 
 		// passed in raw data
-	if d, ok := p.Payload().(*raw.Frame); ok {
+		if d, ok := p.Payload().(*codec.Frame); ok {
 			body = d.Data
 		} else {
 			// use codec for payload
-		cf, err := g.newGRPCCodec(p.ContentType())
+			cf, err := g.newCodec(p.ContentType())
 			if err != nil {
 				return errors.InternalServerError("go.micro.client", err.Error())
 			}
@@ -658,78 +760,87 @@ func (g *grpcClient) Publish(ctx context.Context, p client.Message, opts ...clie
 		}
 
 		topic := p.Topic()
-
+		if len(exchange) > 0 {
-	// get the exchange
+			topic = exchange
-	if len(options.Exchange) > 0 {
-		topic = options.Exchange
 		}
 
-	return g.opts.Broker.Publish(topic, &broker.Message{
+		for k, v := range p.Metadata() {
-		Header: md,
+			md.Set(k, v)
-		Body:   body,
+		}
-	}, broker.PublishContext(options.Context))
+		md.Set(metadata.HeaderTopic, topic)
+		msgs = append(msgs, &broker.Message{Header: md, Body: body})
+	}
+
+	return g.opts.Broker.BatchPublish(ctx, msgs,
+		broker.PublishContext(options.Context),
+		broker.PublishBodyOnly(options.BodyOnly),
+	)
 }
 
 func (g *grpcClient) String() string {
 	return "grpc"
 }
 
-func (g *grpcClient) getGrpcDialOptions() []grpc.DialOption {
+func (g *grpcClient) Name() string {
-	if g.opts.CallOptions.Context == nil {
+	return g.opts.Name
-		return nil
 }
 
-	v := g.opts.CallOptions.Context.Value(grpcDialOptions{})
+func (g *grpcClient) getGrpcDialOptions(ctx context.Context) []grpc.DialOption {
+	var opts []grpc.DialOption
 
-	if v == nil {
+	if g.opts.CallOptions.Context != nil {
-		return nil
+		if v := g.opts.CallOptions.Context.Value(grpcDialOptions{}); v != nil {
+			if vopts, ok := v.([]grpc.DialOption); ok {
+				opts = append(opts, vopts...)
+			}
+		}
 	}
 
-	opts, ok := v.([]grpc.DialOption)
+	if ctx != nil {
-
+		if v := ctx.Value(grpcDialOptions{}); v != nil {
-	if !ok {
+			if vopts, ok := v.([]grpc.DialOption); ok {
-		return nil
+				opts = append(opts, vopts...)
+			}
+		}
 	}
 
 	return opts
 }
 
-func (g *grpcClient) getGrpcCallOptions() []grpc.CallOption {
+func (g *grpcClient) getGrpcCallOptions(ctx context.Context) []grpc.CallOption {
-	if g.opts.CallOptions.Context == nil {
+	var opts []grpc.CallOption
-		return nil
+
+	if g.opts.CallOptions.Context != nil {
+		if v := g.opts.CallOptions.Context.Value(grpcCallOptions{}); v != nil {
+			if vopts, ok := v.([]grpc.CallOption); ok {
+				opts = append(opts, vopts...)
+			}
+		}
 	}
 
-	v := g.opts.CallOptions.Context.Value(grpcCallOptions{})
+	if ctx != nil {
-
+		if v := ctx.Value(grpcCallOptions{}); v != nil {
-	if v == nil {
+			if vopts, ok := v.([]grpc.CallOption); ok {
-		return nil
+				opts = append(opts, vopts...)
+			}
 		}
-
-	opts, ok := v.([]grpc.CallOption)
-
-	if !ok {
-		return nil
 	}
 
 	return opts
 }
 
-func newClient(opts ...client.Option) client.Client {
+func NewClient(opts ...client.Option) client.Client {
-	options := client.NewOptions()
+	options := client.NewOptions(opts...)
 	// default content type for grpc
-	options.ContentType = "application/grpc+proto"
+	if options.ContentType == "" {
-
+		options.ContentType = DefaultContentType
-	for _, o := range opts {
-		o(&options)
 	}
 
 	rc := &grpcClient{
 		opts: options,
 	}
-	rc.once.Store(false)
-
-	rc.pool = newPool(options.PoolSize, options.PoolTTL, rc.poolMaxIdle(), rc.poolMaxStreams())
 
+	rc.pool = NewConnPool(options.PoolSize, options.PoolTTL, rc.poolMaxIdle(), rc.poolMaxStreams())
 	c := client.Client(rc)
 
 	// wrap in reverse
@@ -737,25 +848,17 @@ func newClient(opts ...client.Option) client.Client {
 		c = options.Wrappers[i-1](c)
 	}
 
-	rc.codecs = make(map[string]encoding.Codec, len(defaultGRPCCodecs))
-	for k, v := range defaultGRPCCodecs {
-		rc.codecs[k] = v
-	}
-
-	var codecs map[string]encoding.Codec
 	if rc.opts.Context != nil {
-		if v := rc.opts.Context.Value(codecsKey{}); v != nil {
+		if codecs, ok := rc.opts.Context.Value(codecsKey{}).(map[string]encoding.Codec); ok && codecs != nil {
-			codecs = v.(map[string]encoding.Codec)
+			for k, v := range codecs {
+				rc.opts.Codecs[k] = &wrapGrpcCodec{v}
+			}
 		}
 	}
 
-	for k, v := range codecs {
+	for _, k := range options.Codecs {
-		rc.codecs[k] = v
+		encoding.RegisterCodec(&wrapMicroCodec{k})
 	}
 
 	return c
 }
-
-func NewClient(opts ...client.Option) client.Client {
-	return newClient(opts...)
-}

grpc_pool.go

@@ -2,6 +2,7 @@ package grpc
 
 import (
 	"context"
+	"strings"
 	"sync"
 	"time"
 
@@ -9,56 +10,47 @@ import (
 	"google.golang.org/grpc/connectivity"
 )
 
-type pool struct {
+type ConnPool struct {
+	conns      map[string]*streamsPool
 	size       int
 	ttl        int64
-
-	//  max streams on a *poolConn
 	maxStreams int
-	//  max idle conns
 	maxIdle    int
-
 	sync.Mutex
-	conns map[string]*streamsPool
 }
 
 type streamsPool struct {
 	//  head of list
-	head *poolConn
+	head *PoolConn
 	//  busy conns list
-	busy *poolConn
+	busy *PoolConn
 	//  the siza of list
 	count int
 	//  idle conn
 	idle int
 }
 
-type poolConn struct {
+type PoolConn struct {
-	//  grpc conn
-	*grpc.ClientConn
 	err error
-	addr string
+	*grpc.ClientConn
-
+	next    *PoolConn
-	//  pool and streams pool
+	pool    *ConnPool
-	pool    *pool
 	sp      *streamsPool
+	pre     *PoolConn
+	addr    string
 	streams int
 	created int64
-
-	//  list
-	pre  *poolConn
-	next *poolConn
 	in      bool
 }
 
-func newPool(size int, ttl time.Duration, idle int, ms int) *pool {
+func NewConnPool(size int, ttl time.Duration, idle int, ms int) *ConnPool {
 	if ms <= 0 {
 		ms = 1
 	}
 	if idle < 0 {
 		idle = 0
 	}
-	return &pool{
+	return &ConnPool{
 		size:       size,
 		ttl:        int64(ttl.Seconds()),
 		maxStreams: ms,
@@ -67,12 +59,15 @@ func newPool(size int, ttl time.Duration, idle int, ms int) *pool {
 	}
 }
 
-func (p *pool) getConn(ctx context.Context, addr string, opts ...grpc.DialOption) (*poolConn, error) {
+func (p *ConnPool) Get(ctx context.Context, addr string, opts ...grpc.DialOption) (*PoolConn, error) {
+	if strings.HasPrefix(addr, "http") {
+		addr = addr[strings.Index(addr, ":")+3:]
+	}
 	now := time.Now().Unix()
 	p.Lock()
 	sp, ok := p.conns[addr]
 	if !ok {
-		sp = &streamsPool{head: &poolConn{}, busy: &poolConn{}, count: 0, idle: 0}
+		sp = &streamsPool{head: &PoolConn{}, busy: &PoolConn{}, count: 0, idle: 0}
 		p.conns[addr] = sp
 	}
 	//  while we have conns check streams and then return one
@@ -135,12 +130,12 @@ func (p *pool) getConn(ctx context.Context, addr string, opts ...grpc.DialOption
 	}
 	p.Unlock()
 
-	//  create new conn
+	//  create new conn)
 	cc, err := grpc.DialContext(ctx, addr, opts...)
 	if err != nil {
 		return nil, err
 	}
-	conn = &poolConn{cc, nil, addr, p, sp, 1, time.Now().Unix(), nil, nil, false}
+	conn = &PoolConn{ClientConn: cc, err: nil, addr: addr, pool: p, sp: sp, streams: 1, created: time.Now().Unix(), pre: nil, next: nil, in: false}
 
 	//  add conn to streams pool
 	p.Lock()
@@ -152,7 +147,7 @@ func (p *pool) getConn(ctx context.Context, addr string, opts ...grpc.DialOption
 	return conn, nil
 }
 
-func (p *pool) release(addr string, conn *poolConn, err error) {
+func (p *ConnPool) Put(conn *PoolConn, err error) {
 	p.Lock()
 	p, sp, created := conn.pool, conn.sp, conn.created
 	//  try to add conn
@@ -185,14 +180,13 @@ func (p *pool) release(addr string, conn *poolConn, err error) {
 		sp.idle++
 	}
 	p.Unlock()
-	return
 }
 
-func (conn *poolConn) Close() {
+func (conn *PoolConn) Close() {
-	conn.pool.release(conn.addr, conn, conn.err)
+	conn.pool.Put(conn, conn.err)
 }
 
-func removeConn(conn *poolConn) {
+func removeConn(conn *PoolConn) {
 	if conn.pre != nil {
 		conn.pre.next = conn.next
 	}
@@ -203,10 +197,9 @@ func removeConn(conn *poolConn) {
 	conn.next = nil
 	conn.in = false
 	conn.sp.count--
-	return
 }
 
-func addConnAfter(conn *poolConn, after *poolConn) {
+func addConnAfter(conn *PoolConn, after *PoolConn) {
 	conn.next = after.next
 	conn.pre = after
 	if after.next != nil {
@@ -215,5 +208,4 @@ func addConnAfter(conn *poolConn, after *poolConn) {
 	after.next = conn
 	conn.in = true
 	conn.sp.count++
-	return
 }

message.go

@@ -1,20 +1,19 @@
 package grpc
 
 import (
-	"github.com/unistack-org/micro/v3/client"
+	"go.unistack.org/micro/v3/client"
+	"go.unistack.org/micro/v3/metadata"
 )
 
 type grpcEvent struct {
+	payload     interface{}
 	topic       string
 	contentType string
-	payload     interface{}
+	opts        client.MessageOptions
 }
 
 func newGRPCEvent(topic string, payload interface{}, contentType string, opts ...client.MessageOption) client.Message {
-	var options client.MessageOptions
+	options := client.NewMessageOptions(opts...)
-	for _, o := range opts {
-		o(&options)
-	}
 
 	if len(options.ContentType) > 0 {
 		contentType = options.ContentType
@@ -24,6 +23,7 @@ func newGRPCEvent(topic string, payload interface{}, contentType string, opts ..
 		payload:     payload,
 		topic:       topic,
 		contentType: contentType,
+		opts:        options,
 	}
 }
 
@@ -38,3 +38,7 @@ func (g *grpcEvent) Topic() string {
 func (g *grpcEvent) Payload() interface{} {
 	return g.payload
 }
+
+func (g *grpcEvent) Metadata() metadata.Metadata {
+	return g.opts.Metadata
+}

options.go

@@ -3,15 +3,14 @@ package grpc
 
 import (
 	"context"
-	"crypto/tls"
 
-	"github.com/unistack-org/micro/v3/client"
+	"go.unistack.org/micro/v3/client"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/encoding"
 )
 
 var (
-	// DefaultPoolMaxStreams maximum streams on a connectioin
+	// DefaultPoolMaxStreams maximum streams on a connection
 	// (20)
 	DefaultPoolMaxStreams = 20
 
@@ -26,16 +25,12 @@ var (
 	// DefaultMaxSendMsgSize maximum message that client can send
 	// (4 MB).
 	DefaultMaxSendMsgSize = 1024 * 1024 * 4
+
+	// DefaultServiceConfig enable load balancing
+	DefaultServiceConfig = `{"loadBalancingPolicy":"round_robin"}`
 )
 
 type poolMaxStreams struct{}
-type poolMaxIdle struct{}
-type codecsKey struct{}
-type tlsAuth struct{}
-type maxRecvMsgSizeKey struct{}
-type maxSendMsgSizeKey struct{}
-type grpcDialOptions struct{}
-type grpcCallOptions struct{}
 
 // maximum streams on a connectioin
 func PoolMaxStreams(n int) client.Option {
@@ -47,6 +42,8 @@ func PoolMaxStreams(n int) client.Option {
 	}
 }
 
+type poolMaxIdle struct{}
+
 // maximum idle conns of a pool
 func PoolMaxIdle(d int) client.Option {
 	return func(o *client.Options) {
@@ -57,6 +54,8 @@ func PoolMaxIdle(d int) client.Option {
 	}
 }
 
+type codecsKey struct{}
+
 // gRPC Codec to be used to encode/decode requests for a given content type
 func Codec(contentType string, c encoding.Codec) client.Option {
 	return func(o *client.Options) {
@@ -72,19 +71,9 @@ func Codec(contentType string, c encoding.Codec) client.Option {
 	}
 }
 
-// AuthTLS should be used to setup a secure authentication using TLS
+type maxRecvMsgSizeKey struct{}
-func AuthTLS(t *tls.Config) client.Option {
-	return func(o *client.Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, tlsAuth{}, t)
-	}
-}
 
-//
 // MaxRecvMsgSize set the maximum size of message that client can receive.
-//
 func MaxRecvMsgSize(s int) client.Option {
 	return func(o *client.Options) {
 		if o.Context == nil {
@@ -94,9 +83,9 @@ func MaxRecvMsgSize(s int) client.Option {
 	}
 }
 
-//
+type maxSendMsgSizeKey struct{}
+
 // MaxSendMsgSize set the maximum size of message that client can send.
-//
 func MaxSendMsgSize(s int) client.Option {
 	return func(o *client.Options) {
 		if o.Context == nil {
@@ -106,9 +95,9 @@ func MaxSendMsgSize(s int) client.Option {
 	}
 }
 
-//
+type grpcDialOptions struct{}
+
 // DialOptions to be used to configure gRPC dial options
-//
 func DialOptions(opts ...grpc.DialOption) client.CallOption {
 	return func(o *client.CallOptions) {
 		if o.Context == nil {
@@ -118,9 +107,9 @@ func DialOptions(opts ...grpc.DialOption) client.CallOption {
 	}
 }
 
-//
+type grpcCallOptions struct{}
+
 // CallOptions to be used to configure gRPC call options
-//
 func CallOptions(opts ...grpc.CallOption) client.CallOption {
 	return func(o *client.CallOptions) {
 		if o.Context == nil {
@@ -129,3 +118,14 @@ func CallOptions(opts ...grpc.CallOption) client.CallOption {
 		o.Context = context.WithValue(o.Context, grpcCallOptions{}, opts)
 	}
 }
+
+type serviceConfigKey struct{}
+
+func ServiceConfig(str string) client.CallOption {
+	return func(options *client.CallOptions) {
+		if options.Context == nil {
+			options.Context = context.Background()
+		}
+		options.Context = context.WithValue(options.Context, serviceConfigKey{}, str)
+	}
+}

request.go

@@ -4,17 +4,17 @@ import (
 	"fmt"
 	"strings"
 
-	"github.com/unistack-org/micro/v3/client"
+	"go.unistack.org/micro/v3/client"
-	"github.com/unistack-org/micro/v3/codec"
+	"go.unistack.org/micro/v3/codec"
 )
 
 type grpcRequest struct {
+	request     interface{}
+	codec       codec.Codec
 	service     string
 	method      string
 	contentType string
-	request     interface{}
 	opts        client.RequestOptions
-	codec       codec.Codec
 }
 
 // service Struct.Method /service.Struct/Method
@@ -38,15 +38,12 @@ func methodToGRPC(service, method string) string {
 	return fmt.Sprintf("/%s.%s/%s", service, mParts[0], mParts[1])
 }
 
-func newGRPCRequest(service, method string, request interface{}, contentType string, reqOpts ...client.RequestOption) client.Request {
+func newGRPCRequest(service, method string, request interface{}, contentType string, opts ...client.RequestOption) client.Request {
-	var opts client.RequestOptions
+	options := client.NewRequestOptions(opts...)
-	for _, o := range reqOpts {
-		o(&opts)
-	}
 
 	// set the content-type specified
-	if len(opts.ContentType) > 0 {
+	if len(options.ContentType) > 0 {
-		contentType = opts.ContentType
+		contentType = options.ContentType
 	}
 
 	return &grpcRequest{
@@ -54,7 +51,7 @@ func newGRPCRequest(service, method string, request interface{}, contentType str
 		method:      method,
 		request:     request,
 		contentType: contentType,
-		opts:        opts,
+		opts:        options,
 	}
 }
 
@@ -74,7 +71,7 @@ func (g *grpcRequest) Endpoint() string {
 	return g.method
 }
 
-func (g *grpcRequest) Codec() codec.Writer {
+func (g *grpcRequest) Codec() codec.Codec {
 	return g.codec
 }
 

response.go

@@ -3,41 +3,39 @@ package grpc
 import (
 	"strings"
 
-	"github.com/unistack-org/micro/v3/codec"
+	"go.unistack.org/micro/v3/codec"
-	"github.com/unistack-org/micro-codec-bytes"
+	"go.unistack.org/micro/v3/metadata"
 	"google.golang.org/grpc"
-	"google.golang.org/grpc/encoding"
 )
 
 type response struct {
-	conn   *poolConn
+	conn   *PoolConn
 	stream grpc.ClientStream
-	codec  encoding.Codec
+	codec  codec.Codec
-	gcodec codec.Codec
 }
 
 // Read the response
-func (r *response) Codec() codec.Reader {
+func (r *response) Codec() codec.Codec {
-	return r.gcodec
+	return r.codec
 }
 
 // read the header
-func (r *response) Header() map[string]string {
+func (r *response) Header() metadata.Metadata {
-	md, err := r.stream.Header()
+	meta, err := r.stream.Header()
 	if err != nil {
-		return map[string]string{}
+		return nil
 	}
-	hdr := make(map[string]string, len(md))
+	md := metadata.New(len(meta))
-	for k, v := range md {
+	for k, v := range meta {
-		hdr[k] = strings.Join(v, ",")
+		md.Set(k, strings.Join(v, ","))
 	}
-	return hdr
+	return md
 }
 
 // Read the undecoded response
 func (r *response) Read() ([]byte, error) {
-	f := &bytes.Frame{}
+	f := &codec.Frame{}
-	if err := r.gcodec.ReadBody(f); err != nil {
+	if err := r.codec.ReadBody(&wrapStream{r.stream}, f); err != nil {
 		return nil, err
 	}
 	return f.Data, nil

stream.go

@@ -5,23 +5,21 @@ import (
 	"io"
 	"sync"
 
-	"github.com/unistack-org/micro/v3/client"
+	"go.unistack.org/micro/v3/client"
 	"google.golang.org/grpc"
 )
 
 // Implements the streamer interface
 type grpcStream struct {
-	// embed so we can access if need be
 	grpc.ClientStream
-
+	context  context.Context
-	sync.RWMutex
-	closed   bool
 	err      error
-	conn     *poolConn
 	request  client.Request
 	response client.Response
-	context  context.Context
 	close    func(err error)
+	conn     *PoolConn
+	sync.RWMutex
+	closed bool
 }
 
 func (g *grpcStream) Context() context.Context {
@@ -44,6 +42,14 @@ func (g *grpcStream) Send(msg interface{}) error {
 	return nil
 }
 
+func (g *grpcStream) SendMsg(msg interface{}) error {
+	if err := g.ClientStream.SendMsg(msg); err != nil {
+		g.setError(err)
+		return err
+	}
+	return nil
+}
+
 func (g *grpcStream) Recv(msg interface{}) (err error) {
 	defer g.setError(err)
 
@@ -62,6 +68,24 @@ func (g *grpcStream) Recv(msg interface{}) (err error) {
 	return
 }
 
+func (g *grpcStream) RecvMsg(msg interface{}) (err error) {
+	defer g.setError(err)
+
+	if err = g.ClientStream.RecvMsg(msg); err != nil {
+		// #202 - inconsistent gRPC stream behavior
+		// the only way to tell if the stream is done is when we get a EOF on the Recv
+		// here we should close the underlying gRPC ClientConn
+		closeErr := g.Close()
+		if err == io.EOF && closeErr != nil {
+			err = closeErr
+		}
+
+		return err
+	}
+
+	return
+}
+
 func (g *grpcStream) Error() error {
 	g.RLock()
 	defer g.RUnlock()
@@ -92,3 +116,17 @@ func (g *grpcStream) Close() error {
 	g.close(g.err)
 	return g.ClientStream.CloseSend()
 }
+
+func (g *grpcStream) CloseSend() error {
+	g.Lock()
+	defer g.Unlock()
+
+	if g.closed {
+		return nil
+	}
+
+	// close the connection
+	g.closed = true
+	g.close(g.err)
+	return g.ClientStream.CloseSend()
+}