send metadata as lowercase

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

.github/dependabot.yml

@@ -1,19 +0,0 @@
-# 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/workflows/autoapprove.yml

@@ -1,20 +0,0 @@
-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

@@ -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/workflows/build.yml

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

.github/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/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/workflows/job_coverage.yml

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

.github/workflows/job_lint.yml

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

.github/workflows/job_sync.yml

@@ -0,0 +1,52 @@
+name: sync
+
+on:
+  schedule:
+    - cron: '*/5 * * * *'
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  sync:
+    if: github.server_url != 'https://github.com'
+    runs-on: ubuntu-latest
+    steps:
+    - name: init
+      run: |
+        git config --global user.email "vtolstov <vtolstov@users.noreply.github.com>"
+        git config --global user.name "github-actions[bot]"
+        echo "machine git.unistack.org login vtolstov password ${{ secrets.TOKEN_GITEA }}" >> /root/.netrc
+        echo "machine github.com login vtolstov password ${{ secrets.TOKEN_GITHUB }}" >> /root/.netrc
+
+    - name: sync master
+      run: |
+        git clone --filter=blob:none --filter=tree:0 --branch master --single-branch ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} repo
+        cd repo
+        git remote add --no-tags --fetch --track master upstream https://github.com/${GITHUB_REPOSITORY}
+        git merge upstream/master
+        git push upstream master --progress
+        git push origin master --progress
+        cd ../
+        rm -rf repo
+
+    - name: sync v3
+      run: |
+        git clone --filter=blob:none --filter=tree:0 --branch v3 --single-branch ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} repo
+        cd repo
+        git remote add --no-tags --fetch --track v3 upstream https://github.com/${GITHUB_REPOSITORY}
+        git merge upstream/v3
+        git push upstream v3 --progress
+        git push origin v3 --progress
+        cd ../
+        rm -rf repo
+
+    - name: sync v4
+      run: |
+        git clone --filter=blob:none --filter=tree:0 --branch v4 --single-branch ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} repo
+        cd repo
+        git remote add --no-tags --fetch --track v4 upstream https://github.com/${GITHUB_REPOSITORY}
+        git merge upstream/v4
+        git push upstream v4 --progress
+        git push origin v4 --progress
+        cd ../
+        rm -rf repo

.github/workflows/job_test.yml

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

.github/workflows/job_tests.yml

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

.github/workflows/pr.yml

@@ -1,47 +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:
-          # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.
-          version: v1.30
-          # Optional: working directory, useful for monorepos
-          # working-directory: somedir
-          # Optional: golangci-lint command line arguments.
-          # args: --issues-exit-code=0
-          # Optional: show only new issues if it's a pull request. The default value is `false`.
-          # only-new-issues: true

.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

@@ -1,44 +1,5 @@
 run:
-  concurrency: 4
-  deadline: 5m
+  concurrency: 8
+  timeout: 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

README.md

@@ -0,0 +1,4 @@
+# GRPC Client
+![Coverage](https://img.shields.io/badge/Coverage-2.3%25-red)
+
+This plugin is a grpc client for micro.

codec.go

@@ -1,9 +1,7 @@
 package grpc
 
 import (
-	"io"
-
-	"go.unistack.org/micro/v3/codec"
+	"go.unistack.org/micro/v4/codec"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/encoding"
 )
@@ -65,63 +63,3 @@ func (w *wrapGrpcCodec) Unmarshal(d []byte, v interface{}, opts ...codec.Option)
 	}
 	return w.Codec.Unmarshal(d, v)
 }
-
-/*
-type grpcCodec struct {
-	grpc.ServerStream
-	// headers
-	id       string
-	target   string
-	method   string
-	endpoint string
-
-	c encoding.Codec
-}
-
-*/
-
-func (w *wrapGrpcCodec) ReadHeader(conn io.Reader, m *codec.Message, mt codec.MessageType) error {
-	/*
-		if m == nil {
-			m = codec.NewMessage(codec.Request)
-		}
-
-		if md, ok := metadata.FromIncomingContext(g.ServerStream.Context()); ok {
-			if m.Header == nil {
-				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 (w *wrapGrpcCodec) ReadBody(conn io.Reader, v interface{}) error {
-	// caller has requested a frame
-	if m, ok := v.(*codec.Frame); ok {
-		_, err := conn.Read(m.Data)
-		return err
-	}
-	return codec.ErrInvalidMessage
-}
-
-func (w *wrapGrpcCodec) Write(conn io.Writer, m *codec.Message, v interface{}) error {
-	// if we don't have a body
-	if v != nil {
-		b, err := w.Marshal(v)
-		if err != nil {
-			return err
-		}
-		m.Body = b
-	}
-	// write the body using the framing codec
-	_, err := conn.Write(m.Body)
-	return err
-}

codec_test.go

@@ -0,0 +1,67 @@
+package grpc
+
+import (
+	"context"
+	"testing"
+
+	"go.unistack.org/micro/v4/codec"
+	gmetadata "google.golang.org/grpc/metadata"
+)
+
+type mockStream struct {
+	msg any
+}
+
+func (m mockStream) Header() (gmetadata.MD, error) {
+	return nil, nil
+}
+
+func (m mockStream) Trailer() gmetadata.MD {
+	return nil
+}
+
+func (m mockStream) CloseSend() error {
+	return nil
+}
+
+func (m mockStream) Context() context.Context {
+	return nil
+}
+
+func (m *mockStream) SendMsg(msg any) error {
+	m.msg = msg
+	return nil
+}
+
+func (m *mockStream) RecvMsg(msg any) error {
+
+	c := msg.(*codec.Frame)
+	c.Data = m.msg.(*codec.Frame).Data
+
+	return nil
+}
+
+func Test_ReadWrap(t *testing.T) {
+
+	wp := wrapStream{
+		&mockStream{},
+	}
+
+	write, err := wp.Write([]byte("test_data"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if write != 9 {
+		t.Error("uncorrected number wrote bytes")
+	}
+
+	b := make([]byte, write)
+	read, err := wp.Read(b)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if read != 9 || string(b) != "test_data" {
+		t.Error("uncorrected number wrote bytes or data")
+	}
+}

error.go

@@ -1,7 +1,7 @@
 package grpc
 
 import (
-	"go.unistack.org/micro/v3/errors"
+	"go.unistack.org/micro/v4/errors"
 	"google.golang.org/grpc/status"
 )
 

go.mod

@@ -1,17 +1,24 @@
-module go.unistack.org/micro-client-grpc/v3
+module go.unistack.org/micro-client-grpc/v4
 
-go 1.20
+go 1.23.0
+
+toolchain go1.23.3
 
 require (
-	go.unistack.org/micro/v3 v3.10.28
-	google.golang.org/grpc v1.59.0
+	go.unistack.org/micro/v4 v4.1.7
+	google.golang.org/grpc v1.72.0
 )
 
 require (
-	github.com/golang/protobuf v1.5.3 // indirect
-	golang.org/x/net v0.17.0 // indirect
-	golang.org/x/sys v0.13.0 // indirect
-	golang.org/x/text v0.13.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20231016165738-49dd2c1f3d0b // indirect
-	google.golang.org/protobuf v1.31.0 // indirect
+	github.com/ash3in/uuidv8 v1.2.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/matoous/go-nanoid v1.5.1 // indirect
+	github.com/spf13/cast v1.7.1 // indirect
+	go.unistack.org/micro-proto/v4 v4.1.0 // indirect
+	golang.org/x/net v0.39.0 // indirect
+	golang.org/x/sys v0.32.0 // indirect
+	golang.org/x/text v0.24.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20250425173222-7b384671a197 // indirect
+	google.golang.org/protobuf v1.36.6 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,22 +1,59 @@
-github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
-github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
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-golang.org/x/net v0.17.0/go.mod h1:NxSsAGuq816PNPmqtQdLE42eU2Fs7NoRIZrHJAlaCOE=
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-google.golang.org/grpc v1.59.0/go.mod h1:aUPDwccQo6OTjy7Hct4AfBPD1GptF4fyUjIkQ9YtF98=
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grpc.go

@@ -1,28 +1,32 @@
-// Package grpc provides a gRPC client
-package grpc // import "go.unistack.org/micro-client-grpc/v3"
+// Package grpc provides a gRPC client for micro framework
+package grpc
 
 import (
 	"context"
 	"crypto/tls"
 	"fmt"
 	"net"
-	"os"
 	"reflect"
+	"strconv"
 	"strings"
 	"sync"
 	"time"
 
-	"go.unistack.org/micro/v3/broker"
-	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/errors"
-	"go.unistack.org/micro/v3/metadata"
-	"go.unistack.org/micro/v3/selector"
+	"go.unistack.org/micro/v4/client"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/errors"
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/options"
+	"go.unistack.org/micro/v4/selector"
+	"go.unistack.org/micro/v4/semconv"
+	"go.unistack.org/micro/v4/tracer"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/credentials/insecure"
 	"google.golang.org/grpc/encoding"
 	gmetadata "google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/status"
 )
 
 const (
@@ -30,8 +34,10 @@ const (
 )
 
 type grpcClient struct {
-	pool *ConnPool
-	opts client.Options
+	funcCall   client.FuncCall
+	funcStream client.FuncStream
+	pool       *ConnPool
+	opts       client.Options
 	sync.RWMutex
 	init bool
 }
@@ -68,36 +74,33 @@ func (g *grpcClient) secure(addr string) grpc.DialOption {
 }
 
 func (g *grpcClient) call(ctx context.Context, addr string, req client.Request, rsp interface{}, opts client.CallOptions) error {
-	var header map[string]string
+	var header map[string][]string
 
 	if md, ok := metadata.FromOutgoingContext(ctx); ok {
-		header = make(map[string]string, len(md))
-		for k, v := range md {
-			header[strings.ToLower(k)] = v
-		}
+		header = metadata.Copy(md).AsHTTP2()
 	} else {
-		header = make(map[string]string, 2)
+		header = make(map[string][]string, 2)
 	}
 	if opts.RequestMetadata != nil {
 		for k, v := range opts.RequestMetadata {
-			header[k] = v
+			header[strings.ToLower(k)] = v
 		}
 	}
 	// set timeout in nanoseconds
-	header["Grpc-Timeout"] = fmt.Sprintf("%dn", opts.RequestTimeout)
-	header["timeout"] = fmt.Sprintf("%dn", opts.RequestTimeout)
-	header["content-type"] = req.ContentType()
+	header["grpc-timeout"] = append(header["grpc-timeout"], fmt.Sprintf("%dn", opts.RequestTimeout))
+	header["timeout"] = append(header["timeout"], fmt.Sprintf("%dn", opts.RequestTimeout))
+	header["content-type"] = append(header["content-type"], req.ContentType())
 
-	md := gmetadata.New(header)
-	ctx = gmetadata.NewOutgoingContext(ctx, md)
+	ctx = gmetadata.NewOutgoingContext(ctx, header)
 
 	cf, err := g.newCodec(req.ContentType())
 	if err != nil {
-		return errors.InternalServerError("go.micro.client", err.Error())
+		return errors.InternalServerError("go.micro.client", "%+v", err)
 	}
 
 	maxRecvMsgSize := g.maxRecvMsgSizeValue()
 	maxSendMsgSize := g.maxSendMsgSizeValue()
+	cfgService := g.serviceConfig()
 
 	var grr error
 
@@ -116,6 +119,7 @@ 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(g.opts.Context); opts != nil {
@@ -135,7 +139,7 @@ func (g *grpcClient) call(ctx context.Context, addr string, req client.Request,
 
 	cc, err := g.pool.Get(dialCtx, addr, grpcDialOptions...)
 	if err != nil {
-		return errors.InternalServerError("go.micro.client", fmt.Sprintf("Error sending request: %v", err))
+		return errors.InternalServerError("go.micro.client", "Error sending request: %v", err)
 	}
 	defer func() {
 		// defer execution of release
@@ -173,7 +177,7 @@ func (g *grpcClient) call(ctx context.Context, addr string, req client.Request,
 	if opts.ResponseMetadata != nil {
 		*opts.ResponseMetadata = metadata.New(gmd.Len())
 		for k, v := range gmd {
-			opts.ResponseMetadata.Set(k, strings.Join(v, ","))
+			opts.ResponseMetadata.Append(k, v...)
 		}
 	}
 
@@ -181,31 +185,27 @@ func (g *grpcClient) call(ctx context.Context, addr string, req client.Request,
 }
 
 func (g *grpcClient) stream(ctx context.Context, addr string, req client.Request, rsp interface{}, opts client.CallOptions) error {
-	var header map[string]string
+	var header map[string][]string
 
 	if md, ok := metadata.FromOutgoingContext(ctx); ok {
-		header = make(map[string]string, len(md))
-		for k, v := range md {
-			header[k] = v
-		}
+		header = metadata.Copy(md).AsHTTP2()
 	} else {
-		header = make(map[string]string)
+		header = make(map[string][]string)
 	}
 
 	// set timeout in nanoseconds
 	if opts.StreamTimeout > time.Duration(0) {
-		header["Grpc-Timeout"] = fmt.Sprintf("%dn", opts.StreamTimeout)
-		header["timeout"] = fmt.Sprintf("%dn", opts.StreamTimeout)
+		header["grpc-timeout"] = append(header["grpc-timeout"], fmt.Sprintf("%dn", opts.RequestTimeout))
+		header["timeout"] = append(header["timeout"], fmt.Sprintf("%dn", opts.RequestTimeout))
 	}
 	// set the content type for the request
-	header["content-type"] = req.ContentType()
+	header["content-type"] = append(header["content-type"], req.ContentType())
 
-	md := gmetadata.New(header)
-	ctx = gmetadata.NewOutgoingContext(ctx, md)
+	ctx = gmetadata.NewOutgoingContext(ctx, header)
 
 	cf, err := g.newCodec(req.ContentType())
 	if err != nil {
-		return errors.InternalServerError("go.micro.client", err.Error())
+		return errors.InternalServerError("go.micro.client", "%+v", err)
 	}
 
 	var dialCtx context.Context
@@ -221,6 +221,7 @@ func (g *grpcClient) stream(ctx context.Context, addr string, req client.Request
 
 	maxRecvMsgSize := g.maxRecvMsgSizeValue()
 	maxSendMsgSize := g.maxSendMsgSizeValue()
+	cfgService := g.serviceConfig()
 
 	grpcDialOptions := []grpc.DialOption{
 		g.secure(addr),
@@ -228,6 +229,7 @@ func (g *grpcClient) stream(ctx context.Context, addr string, req client.Request
 			grpc.MaxCallRecvMsgSize(maxRecvMsgSize),
 			grpc.MaxCallSendMsgSize(maxSendMsgSize),
 		),
+		grpc.WithDefaultServiceConfig(cfgService),
 	}
 
 	if opts := g.getGrpcDialOptions(opts.Context); opts != nil {
@@ -244,7 +246,7 @@ func (g *grpcClient) stream(ctx context.Context, addr string, req client.Request
 
 	cc, err := g.pool.Get(dialCtx, addr, grpcDialOptions...)
 	if err != nil {
-		return errors.InternalServerError("go.micro.client", fmt.Sprintf("Error sending request: %v", err))
+		return errors.InternalServerError("go.micro.client", "Error sending request: %v", err)
 	}
 
 	desc := &grpc.StreamDesc{
@@ -277,7 +279,7 @@ func (g *grpcClient) stream(ctx context.Context, addr string, req client.Request
 		// release the connection
 		g.pool.Put(cc, err)
 		// now return the error
-		return errors.InternalServerError("go.micro.client", fmt.Sprintf("Error creating stream: %v", err))
+		return errors.InternalServerError("go.micro.client", "Error creating stream: %v", err)
 	}
 
 	// set request codec
@@ -372,6 +374,17 @@ func (g *grpcClient) newCodec(ct string) (codec.Codec, error) {
 	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
@@ -391,25 +404,17 @@ 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.funcCall = g.fnCall
+	g.funcStream = g.fnStream
 
+	g.opts.Hooks.EachPrev(func(hook options.Hook) {
+		switch h := hook.(type) {
+		case client.HookCall:
+			g.funcCall = h(g.funcCall)
+		case client.HookStream:
+			g.funcStream = h(g.funcStream)
+		}
+	})
 	g.init = true
 
 	return nil
@@ -419,10 +424,6 @@ func (g *grpcClient) Options() client.Options {
 	return g.opts
 }
 
-func (g *grpcClient) NewMessage(topic string, msg interface{}, opts ...client.MessageOption) client.Message {
-	return newGRPCEvent(topic, msg, g.opts.ContentType, opts...)
-}
-
 func (g *grpcClient) NewRequest(service, method string, req interface{}, reqOpts ...client.RequestOption) client.Request {
 	return newGRPCRequest(service, method, req, g.opts.ContentType, reqOpts...)
 }
@@ -433,6 +434,32 @@ func (g *grpcClient) Call(ctx context.Context, req client.Request, rsp interface
 	} else if rsp == nil {
 		return errors.InternalServerError("go.micro.client", "rsp is nil")
 	}
+
+	ts := time.Now()
+	g.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Inc()
+	var sp tracer.Span
+	ctx, sp = g.opts.Tracer.Start(ctx, req.Endpoint()+" rpc-client",
+		tracer.WithSpanKind(tracer.SpanKindClient),
+		tracer.WithSpanLabels("endpoint", req.Endpoint()),
+	)
+	err := g.funcCall(ctx, req, rsp, opts...)
+	g.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Dec()
+	te := time.Since(ts)
+	g.opts.Meter.Summary(semconv.ClientRequestLatencyMicroseconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+	g.opts.Meter.Histogram(semconv.ClientRequestDurationSeconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+
+	if me := errors.FromError(err); me == nil {
+		sp.Finish()
+		g.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "success", "code", strconv.Itoa(int(200))).Inc()
+	} else {
+		sp.SetStatus(tracer.SpanStatusError, err.Error())
+		g.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "failure", "code", strconv.Itoa(int(me.Code))).Inc()
+	}
+
+	return err
+}
+
+func (g *grpcClient) fnCall(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
 	// make a copy of call opts
 	callOpts := g.opts.CallOptions
 
@@ -464,11 +491,6 @@ func (g *grpcClient) Call(ctx context.Context, req client.Request, rsp interface
 	// make copy of call method
 	gcall := g.call
 
-	// wrap the call in reverse
-	for i := len(callOpts.CallWrappers); i > 0; i-- {
-		gcall = callOpts.CallWrappers[i-1](gcall)
-	}
-
 	// use the router passed as a call option, or fallback to the rpc clients router
 	if callOpts.Router == nil {
 		callOpts.Router = g.opts.Router
@@ -490,7 +512,7 @@ func (g *grpcClient) Call(ctx context.Context, req client.Request, rsp interface
 		// 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())
+			return errors.InternalServerError("go.micro.client", "%+v", err)
 		}
 
 		// only sleep if greater than 0
@@ -505,7 +527,7 @@ func (g *grpcClient) Call(ctx context.Context, req client.Request, rsp interface
 			// TODO apply any filtering here
 			routes, err = g.opts.Lookup(ctx, req, callOpts)
 			if err != nil {
-				return errors.InternalServerError("go.micro.client", err.Error())
+				return errors.InternalServerError("go.micro.client", "%+v", err)
 			}
 
 			// balance the list of nodes
@@ -568,6 +590,31 @@ func (g *grpcClient) Call(ctx context.Context, req client.Request, rsp interface
 }
 
 func (g *grpcClient) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {
+	ts := time.Now()
+	g.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Inc()
+	var sp tracer.Span
+	ctx, sp = g.opts.Tracer.Start(ctx, req.Endpoint()+" rpc-client",
+		tracer.WithSpanKind(tracer.SpanKindClient),
+		tracer.WithSpanLabels("endpoint", req.Endpoint()),
+	)
+	stream, err := g.funcStream(ctx, req, opts...)
+	g.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Dec()
+	te := time.Since(ts)
+	g.opts.Meter.Summary(semconv.ClientRequestLatencyMicroseconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+	g.opts.Meter.Histogram(semconv.ClientRequestDurationSeconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+
+	if me := status.Convert(err); me == nil {
+		sp.Finish()
+		g.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "success", "code", strconv.Itoa(int(codes.OK))).Inc()
+	} else {
+		sp.SetStatus(tracer.SpanStatusError, err.Error())
+		g.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "failure", "code", strconv.Itoa(int(me.Code()))).Inc()
+	}
+
+	return stream, err
+}
+
+func (g *grpcClient) fnStream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {
 	// make a copy of call opts
 	callOpts := g.opts.CallOptions
 	for _, opt := range opts {
@@ -586,11 +633,6 @@ func (g *grpcClient) Stream(ctx context.Context, req client.Request, opts ...cli
 	// make a copy of stream
 	gstream := g.stream
 
-	// wrap the call in reverse
-	for i := len(callOpts.CallWrappers); i > 0; i-- {
-		gstream = callOpts.CallWrappers[i-1](gstream)
-	}
-
 	// use the router passed as a call option, or fallback to the rpc clients router
 	if callOpts.Router == nil {
 		callOpts.Router = g.opts.Router
@@ -612,7 +654,7 @@ func (g *grpcClient) Stream(ctx context.Context, req client.Request, opts ...cli
 		// call backoff first. Someone may want an initial start delay
 		t, err := callOpts.Backoff(ctx, req, i)
 		if err != nil {
-			return nil, errors.InternalServerError("go.micro.client", err.Error())
+			return nil, errors.InternalServerError("go.micro.client", "%+v", err)
 		}
 
 		// only sleep if greater than 0
@@ -627,7 +669,7 @@ func (g *grpcClient) Stream(ctx context.Context, req client.Request, opts ...cli
 			// 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())
+				return nil, errors.InternalServerError("go.micro.client", "%+v", err)
 			}
 
 			// balance the list of nodes
@@ -700,76 +742,6 @@ 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 {
-	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
-
-	options := client.NewPublishOptions(opts...)
-
-	// get proxy
-	exchange := ""
-	if v, ok := os.LookupEnv("MICRO_PROXY"); ok {
-		exchange = v
-	}
-	// get the exchange
-	if len(options.Exchange) > 0 {
-		exchange = options.Exchange
-	}
-
-	msgs := make([]*broker.Message, 0, len(ps))
-
-	omd, ok := metadata.FromOutgoingContext(ctx)
-	if !ok {
-		omd = metadata.New(2)
-	}
-
-	for _, p := range ps {
-		md := metadata.Copy(omd)
-		md[metadata.HeaderContentType] = p.ContentType()
-		topic := p.Topic()
-		if len(exchange) > 0 {
-			topic = exchange
-		}
-		md.Set(metadata.HeaderTopic, topic)
-		iter := p.Metadata().Iterator()
-		var k, v string
-		for iter.Next(&k, &v) {
-			md.Set(k, v)
-		}
-
-		// passed in raw data
-		if d, ok := p.Payload().(*codec.Frame); ok {
-			body = d.Data
-		} else {
-			// use codec for payload
-			cf, err := g.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
-		}
-
-		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"
 }
@@ -829,23 +801,16 @@ func NewClient(opts ...client.Option) client.Client {
 		options.ContentType = DefaultContentType
 	}
 
-	rc := &grpcClient{
+	c := &grpcClient{
 		opts: options,
 	}
 
-	rc.pool = NewConnPool(options.PoolSize, options.PoolTTL, rc.poolMaxIdle(), rc.poolMaxStreams())
+	c.pool = NewConnPool(options.PoolSize, options.PoolTTL, c.poolMaxIdle(), c.poolMaxStreams())
 
-	c := client.Client(rc)
-
-	// wrap in reverse
-	for i := len(options.Wrappers); i > 0; i-- {
-		c = options.Wrappers[i-1](c)
-	}
-
-	if rc.opts.Context != nil {
-		if codecs, ok := rc.opts.Context.Value(codecsKey{}).(map[string]encoding.Codec); ok && codecs != nil {
+	if c.opts.Context != nil {
+		if codecs, ok := c.opts.Context.Value(codecsKey{}).(map[string]encoding.Codec); ok && codecs != nil {
 			for k, v := range codecs {
-				rc.opts.Codecs[k] = &wrapGrpcCodec{v}
+				c.opts.Codecs[k] = &wrapGrpcCodec{v}
 			}
 		}
 	}
@@ -854,5 +819,8 @@ func NewClient(opts ...client.Option) client.Client {
 		encoding.RegisterCodec(&wrapMicroCodec{k})
 	}
 
+	c.funcCall = c.fnCall
+	c.funcStream = c.fnStream
+
 	return c
 }

grpc_pool.go

@@ -21,22 +21,22 @@ type ConnPool struct {
 
 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 {
 	err error
 	*grpc.ClientConn
-	next    *poolConn
+	next    *PoolConn
 	pool    *ConnPool
 	sp      *streamsPool
-	pre     *poolConn
+	pre     *PoolConn
 	addr    string
 	streams int
 	created int64
@@ -59,7 +59,7 @@ func NewConnPool(size int, ttl time.Duration, idle int, ms int) *ConnPool {
 	}
 }
 
-func (p *ConnPool) Get(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:]
 	}
@@ -67,7 +67,7 @@ func (p *ConnPool) Get(ctx context.Context, addr string, opts ...grpc.DialOption
 	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
@@ -130,12 +130,12 @@ func (p *ConnPool) Get(ctx context.Context, addr string, opts ...grpc.DialOption
 	}
 	p.Unlock()
 
-	//  create new conn)
+	// nolint (TODO need fix)  create new conn)
 	cc, err := grpc.DialContext(ctx, addr, opts...)
 	if err != nil {
 		return nil, err
 	}
-	conn = &poolConn{ClientConn: cc, err: nil, addr: addr, pool: p, sp: sp, streams: 1, created: time.Now().Unix(), pre: nil, next: nil, in: 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()
@@ -147,7 +147,7 @@ func (p *ConnPool) Get(ctx context.Context, addr string, opts ...grpc.DialOption
 	return conn, nil
 }
 
-func (p *ConnPool) Put(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
@@ -182,11 +182,11 @@ func (p *ConnPool) Put(conn *poolConn, err error) {
 	p.Unlock()
 }
 
-func (conn *poolConn) Close() {
+func (conn *PoolConn) Close() {
 	conn.pool.Put(conn, conn.err)
 }
 
-func removeConn(conn *poolConn) {
+func removeConn(conn *PoolConn) {
 	if conn.pre != nil {
 		conn.pre.next = conn.next
 	}
@@ -199,7 +199,7 @@ func removeConn(conn *poolConn) {
 	conn.sp.count--
 }
 
-func addConnAfter(conn *poolConn, after *poolConn) {
+func addConnAfter(conn *PoolConn, after *PoolConn) {
 	conn.next = after.next
 	conn.pre = after
 	if after.next != nil {

message.go

@@ -1,44 +0,0 @@
-package grpc
-
-import (
-	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v3/metadata"
-)
-
-type grpcEvent struct {
-	payload     interface{}
-	topic       string
-	contentType string
-	opts        client.MessageOptions
-}
-
-func newGRPCEvent(topic string, payload interface{}, contentType string, opts ...client.MessageOption) client.Message {
-	options := client.NewMessageOptions(opts...)
-
-	if len(options.ContentType) > 0 {
-		contentType = options.ContentType
-	}
-
-	return &grpcEvent{
-		payload:     payload,
-		topic:       topic,
-		contentType: contentType,
-		opts:        options,
-	}
-}
-
-func (g *grpcEvent) ContentType() string {
-	return g.contentType
-}
-
-func (g *grpcEvent) Topic() string {
-	return g.topic
-}
-
-func (g *grpcEvent) Payload() interface{} {
-	return g.payload
-}
-
-func (g *grpcEvent) Metadata() metadata.Metadata {
-	return g.opts.Metadata
-}

options.go

@@ -4,13 +4,13 @@ package grpc
 import (
 	"context"
 
-	"go.unistack.org/micro/v3/client"
+	"go.unistack.org/micro/v4/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
 
@@ -25,6 +25,9 @@ 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{}
@@ -115,3 +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

@@ -4,8 +4,8 @@ import (
 	"fmt"
 	"strings"
 
-	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v3/codec"
+	"go.unistack.org/micro/v4/client"
+	"go.unistack.org/micro/v4/codec"
 )
 
 type grpcRequest struct {

response.go

@@ -1,15 +1,13 @@
 package grpc
 
 import (
-	"strings"
-
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/metadata"
 	"google.golang.org/grpc"
 )
 
 type response struct {
-	conn   *poolConn
+	conn   *PoolConn
 	stream grpc.ClientStream
 	codec  codec.Codec
 }
@@ -25,18 +23,19 @@ func (r *response) Header() metadata.Metadata {
 	if err != nil {
 		return nil
 	}
-	md := metadata.New(len(meta))
-	for k, v := range meta {
-		md.Set(k, strings.Join(v, ","))
-	}
-	return md
+
+	return metadata.Metadata(meta.Copy())
 }
 
 // Read the undecoded response
 func (r *response) Read() ([]byte, error) {
 	f := &codec.Frame{}
-	if err := r.codec.ReadBody(&wrapStream{r.stream}, f); err != nil {
+	wrap := &wrapStream{r.stream}
+
+	_, err := wrap.Read(f.Data)
+	if err != nil {
 		return nil, err
 	}
+
 	return f.Data, nil
 }

stream.go

@@ -5,7 +5,8 @@ import (
 	"io"
 	"sync"
 
-	"go.unistack.org/micro/v3/client"
+	"go.unistack.org/micro/v4/client"
+	"go.unistack.org/micro/v4/tracer"
 	"google.golang.org/grpc"
 )
 
@@ -17,7 +18,7 @@ type grpcStream struct {
 	request  client.Request
 	response client.Response
 	close    func(err error)
-	conn     *poolConn
+	conn     *PoolConn
 	sync.RWMutex
 	closed bool
 }
@@ -111,6 +112,12 @@ func (g *grpcStream) Close() error {
 		return nil
 	}
 
+	if sp, ok := tracer.SpanFromContext(g.context); ok && sp != nil {
+		if g.err != nil {
+			sp.SetStatus(tracer.SpanStatusError, g.err.Error())
+		}
+		sp.Finish()
+	}
 	// close the connection
 	g.closed = true
 	g.close(g.err)