fix proto

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
2020-12-10 15:59:43 +03:00
33 changed files with 1621 additions and 1187 deletions
--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@@ -1,6 +1,6 @@
 ---
 name: Bug report
-about: For reporting bugs in micro
+about: For reporting bugs in go-micro
 title: "[BUG]"
 labels: ''
 assignees: ''
@@ -16,3 +16,9 @@ assignees: ''
 **How to reproduce the bug:**

 If possible, please include a minimal code snippet here.
+
+**Environment:**
+Go Version: please paste `go version` output here
+```
+please paste `go env` output here
+```
--- a/.github/ISSUE_TEMPLATE/feature-request---enhancement.md
+++ b/.github/ISSUE_TEMPLATE/feature-request---enhancement.md
@@ -1,6 +1,6 @@
 ---
 name: Feature request / Enhancement
-about: If you have a need not served by micro
+about: If you have a need not served by go-micro
 title: "[FEATURE]"
 labels: ''
 assignees: ''
@@ -14,4 +14,4 @@ A clear and concise description of what the problem is. Ex. I'm always frustrate
 A clear and concise description of what you want to happen.

 **Additional context**
-Add any other context or screenshots about the feature request here.
+Add any other context or screenshots about the feature request here.
--- a/.github/ISSUE_TEMPLATE/question.md
+++ b/.github/ISSUE_TEMPLATE/question.md
@@ -1,8 +1,14 @@
 ---
 name: Question
-about: Ask a question about micro
+about: Ask a question about go-micro
 title: ''
 labels: ''
 assignees: ''

---
+---
+
+Before asking, please check if your question has already been answered: 
+
+1. Check the documentation - https://micro.mu/docs/
+2. Check the examples and plugins - https://github.com/micro/examples & https://github.com/micro/go-plugins
+3. Search existing issues
--- a/.github/autoapprove.yml
+++ b/.github/autoapprove.yml
@@ -1,28 +0,0 @@
-name: "autoapprove"
-
-on:
-  pull_request_target:
-    types: [assigned, opened, synchronize, reopened]
-  workflow_run:
-    workflows: ["prbuild"]
-    types:
-      - completed
-
-permissions:
-  pull-requests: write
-  contents: write
-
-jobs:
-  autoapprove:
-    runs-on: ubuntu-latest
-    steps:
-      - name: approve
-        run: [ "curl -o tea https://dl.gitea.com/tea/main/tea-main-linux-amd64",
-               "chmod +x ./tea",
-               "./tea login add --name unistack --token ${{ secrets.GITHUB_TOKEN }} --url https://git.unistack.org",
-               "./tea pr --repo ${{ github.event.repository.name }}"
-        ]
-        if: github.actor == 'vtolstov'
-        id: approve
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
--- a/.github/stale.sh
+++ b/.github/stale.sh
@@ -0,0 +1,13 @@
+#!/bin/bash -ex
+
+export PATH=$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
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -0,0 +1,46 @@
+name: build
+on:
+ push:
+    branches:
+    - master
+jobs:
+  test:
+    name: test
+    runs-on: ubuntu-latest
+    steps:
+    - name: setup
+      uses: actions/setup-go@v1
+      with:
+        go-version: 1.15
+    - name: checkout
+      uses: actions/checkout@v2
+    - name: cache
+      uses: actions/cache@v2
+      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@v2
+      - name: lint
+        uses: golangci/golangci-lint-action@v1
+        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
--- a/.github/workflows/job_coverage.yml
+++ b/.github/workflows/job_coverage.yml
@@ -1,53 +0,0 @@
-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 }}
--- a/.github/workflows/job_lint.yml
+++ b/.github/workflows/job_lint.yml
@@ -1,29 +0,0 @@
-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'
--- a/.github/workflows/job_sync.yml
+++ b/.github/workflows/job_sync.yml
@@ -1,94 +0,0 @@
-name: sync
-
-on:
-  schedule:
-    - cron: '*/5 * * * *'
-  # Allows you to run this workflow manually from the Actions tab
-  workflow_dispatch:
-
-jobs:
-  sync:
-    if: github.server_url != 'https://github.com'
-    runs-on: ubuntu-latest
-    steps:
-    - name: init
-      run: |
-        git config --global user.email "vtolstov <vtolstov@users.noreply.github.com>"
-        git config --global user.name "github-actions[bot]"
-        echo "machine git.unistack.org login vtolstov password ${{ secrets.TOKEN_GITEA }}" >> /root/.netrc
-        echo "machine github.com login vtolstov password ${{ secrets.TOKEN_GITHUB }}" >> /root/.netrc
-
-    - name: check master
-      id: check_master
-      run: |
-        src_hash=$(git ls-remote https://github.com/${GITHUB_REPOSITORY} refs/heads/master | cut -f1)
-        dst_hash=$(git ls-remote ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} refs/heads/master | cut -f1)
-        echo "src_hash=$src_hash"
-        echo "dst_hash=$dst_hash"
-        if [ "$src_hash" != "$dst_hash" ]; then
-          echo "sync_needed=true" >> $GITHUB_OUTPUT
-        else
-          echo "sync_needed=false" >> $GITHUB_OUTPUT
-        fi
-
-    - name: sync master
-      if: steps.check_master.outputs.sync_needed == 'true'
-      run: |
-        git clone --filter=blob:none --filter=tree:0 --branch master --single-branch ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} repo
-        cd repo
-        git remote add --no-tags --fetch --track master upstream https://github.com/${GITHUB_REPOSITORY}
-        git pull --rebase upstream master
-        git push upstream master --progress
-        git push origin master --progress
-        cd ../
-        rm -rf repo
-
-    - name: check v3
-      id: check_v3
-      run: |
-        src_hash=$(git ls-remote https://github.com/${GITHUB_REPOSITORY} refs/heads/v3 | cut -f1)
-        dst_hash=$(git ls-remote ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} refs/heads/v3 | cut -f1)
-        echo "src_hash=$src_hash"
-        echo "dst_hash=$dst_hash"
-        if [ "$src_hash" != "$dst_hash" ]; then
-          echo "sync_needed=true" >> $GITHUB_OUTPUT
-        else
-          echo "sync_needed=false" >> $GITHUB_OUTPUT
-        fi
-
-    - name: sync v3
-      if: steps.check_v3.outputs.sync_needed == 'true'
-      run: |
-        git clone --filter=blob:none --filter=tree:0 --branch v3 --single-branch ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} repo
-        cd repo
-        git remote add --no-tags --fetch --track v3 upstream https://github.com/${GITHUB_REPOSITORY}
-        git pull --rebase upstream v3
-        git push upstream v3 --progress
-        git push origin v3 --progress
-        cd ../
-        rm -rf repo
-
-    - name: check v4
-      id: check_v4
-      run: |
-        src_hash=$(git ls-remote https://github.com/${GITHUB_REPOSITORY} refs/heads/v4 | cut -f1)
-        dst_hash=$(git ls-remote ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} refs/heads/v4 | cut -f1)
-        echo "src_hash=$src_hash"
-        echo "dst_hash=$dst_hash"
-        if [ "$src_hash" != "$dst_hash" ]; then
-          echo "sync_needed=true" >> $GITHUB_OUTPUT
-        else
-          echo "sync_needed=false" >> $GITHUB_OUTPUT
-        fi
-
-    - name: sync v4
-      if: steps.check_v4.outputs.sync_needed == 'true'
-      run: |
-        git clone --filter=blob:none --filter=tree:0 --branch v4 --single-branch ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} repo
-        cd repo
-        git remote add --no-tags --fetch --track v4 upstream https://github.com/${GITHUB_REPOSITORY}
-        git pull --rebase upstream v4
-        git push upstream v4 --progress
-        git push origin v4 --progress
-        cd ../
-        rm -rf repo
--- a/.github/workflows/job_test.yml
+++ b/.github/workflows/job_test.yml
@@ -1,31 +0,0 @@
-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 ./...
--- a/.github/workflows/job_tests.yml
+++ b/.github/workflows/job_tests.yml
@@ -1,50 +0,0 @@
-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
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -0,0 +1,46 @@
+name: prbuild
+on:
+  pull_request:
+    branches:
+    - master
+jobs:
+  test:
+    name: test
+    runs-on: ubuntu-latest
+    steps:
+    - name: setup
+      uses: actions/setup-go@v1
+      with:
+        go-version: 1.15
+    - name: checkout
+      uses: actions/checkout@v2
+    - name: cache
+      uses: actions/cache@v2
+      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@v2
+      - name: lint
+        uses: golangci/golangci-lint-action@v1
+        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
--- a/.gitignore
+++ b/.gitignore
@@ -1,24 +0,0 @@
-# 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
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -1,5 +0,0 @@
-run:
-  concurrency: 8
-  timeout: 5m
-  issues-exit-code: 1
-  tests: true
--- a/192
+++ b/192
@@ -1,192 +0,0 @@
-
-                                 Apache License
-                           Version 2.0, January 2004
-                        http://www.apache.org/licenses/
-
-   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
-
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-      the copyright owner that is granting the License.
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-      outstanding shares, or (iii) beneficial ownership of such entity.
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-      "You" (or "Your") shall mean an individual or Legal Entity
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-      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.
--- a/README.md
+++ b/README.md
@@ -1,4 +1,25 @@
 # GRPC Client
-![Coverage](https://img.shields.io/badge/Coverage-2.3%25-red)

-This plugin is a grpc client for micro.
+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()),
+	)
+}
+```
--- a/codec.go
+++ b/codec.go
@@ -1,65 +1,231 @@
 package grpc

 import (
-	"go.unistack.org/micro/v4/codec"
+	b "bytes"
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	oldjsonpb "github.com/golang/protobuf/jsonpb"
+	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 (
-	_ encoding.Codec = &wrapMicroCodec{}
-	_ codec.Codec    = &wrapGrpcCodec{}
+	defaultGRPCCodecs = map[string]encoding.Codec{
+		"application/json":         jsonCodec{},
+		"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{},
+	}
 )

-type wrapStream struct{ grpc.ClientStream }
-
-func (w *wrapStream) Write(d []byte) (int, error) {
-	n := len(d)
-	err := w.ClientStream.SendMsg(&codec.Frame{Data: d})
-	return n, err
+// UseNumber fix unmarshal Number(8234567890123456789) to interface(8.234567890123457e+18)
+func UseNumber() {
+	useNumber = true
 }

-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 {
+func (w wrapCodec) String() string {
 	return w.Codec.Name()
 }

-func (w *wrapGrpcCodec) Marshal(v interface{}, opts ...codec.Option) ([]byte, error) {
-	if m, ok := v.(*codec.Frame); ok {
+func (w wrapCodec) Marshal(v interface{}) ([]byte, error) {
+	switch m := v.(type) {
+	case *bytes.Frame:
 		return m.Data, nil
 	}
 	return w.Codec.Marshal(v)
 }

-func (w *wrapGrpcCodec) Unmarshal(d []byte, v interface{}, opts ...codec.Option) error {
-	if d == nil || v == nil {
+func (w wrapCodec) Unmarshal(data []byte, v interface{}) error {
+	if len(data) == 0 {
 		return nil
 	}
-	if m, ok := v.(*codec.Frame); ok {
-		m.Data = d
+	if v == nil {
 		return nil
 	}
-	return w.Codec.Unmarshal(d, v)
+	switch m := v.(type) {
+	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 {
+	// 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 {
+		return err
+	}
+	if m == nil {
+		m = new(codec.Message)
+	}
+	if m.Header == nil {
+		m.Header = make(map[string]string, 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 {
+	switch m := v.(type) {
+	case *bytes.Frame:
+		return g.s.RecvMsg(m)
+	}
+	return g.s.RecvMsg(v)
+}
+
+func (g *grpcCodec) Write(m *codec.Message, v interface{}) error {
+	// if we don't have a body
+	if v != nil {
+		return g.s.SendMsg(v)
+	}
+	// write the body using the framing codec
+	return g.s.SendMsg(&bytes.Frame{Data: m.Body})
+}
+
+func (g *grpcCodec) Close() error {
+	return g.s.CloseSend()
+}
+
+func (g *grpcCodec) String() string {
+	return g.c.Name()
 }
--- a/codec_test.go
+++ b/codec_test.go
@@ -1,67 +0,0 @@
-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")
-	}
-}
--- a/error.go
+++ b/error.go
@@ -1,7 +1,8 @@
 package grpc

 import (
-	"go.unistack.org/micro/v4/errors"
+	pberr "github.com/unistack-org/micro-client-grpc/errors"
+	"github.com/unistack-org/micro/v3/errors"
 	"google.golang.org/grpc/status"
 )

@@ -9,46 +10,35 @@ 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
 	}

-	details := s.Details()
-	switch len(details) {
-	case 0:
-		if verr := errors.Parse(s.Message()); verr.Code > 0 {
-			// return micro error
-			return verr
+	// return first error from details
+	if details := s.Details(); len(details) > 0 {
+		if verr, ok := details[0].(error); ok {
+			return microError(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
 	}

-	// attached messages in details more then 1, try to fallback to micro error
-	if verr := errors.Parse(s.Message()); verr.Code > 0 {
-		// return micro error
-		return verr
+	// try to decode micro *errors.Error
+	if e := errors.Parse(s.Message()); e.Code > 0 {
+		return e // actually a micro error
 	}

-	// not micro error return base error
-	return err
+	// fallback
+	return errors.InternalServerError("go.micro.client", s.Message())
 }
--- a/errors/errors.go
+++ b/errors/errors.go
@@ -0,0 +1,159 @@
+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
+}
--- a/errors/errors.pb.go
+++ b/errors/errors.pb.go
@@ -0,0 +1,173 @@
+// 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, 0x06,
+	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, 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: 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
+}
--- a/errors/errors.pb.micro.go
+++ b/errors/errors.pb.micro.go
@@ -0,0 +1,21 @@
+// 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
--- a/errors/errors.proto
+++ b/errors/errors.proto
@@ -0,0 +1,10 @@
+syntax = "proto3";
+
+package errors;
+
+message Error {
+  string id = 1;
+  int32 code = 2;
+  string detail = 3;
+  string status = 4;
+};
--- a/generate.go
+++ b/generate.go
@@ -0,0 +1,3 @@
+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
--- a/go.mod
+++ b/go.mod
@@ -1,24 +1,15 @@
-module go.unistack.org/micro-client-grpc/v4
+module github.com/unistack-org/micro-client-grpc

-go 1.23.0
-
-toolchain go1.23.3
+go 1.15

 require (
-	go.unistack.org/micro/v4 v4.1.7
-	google.golang.org/grpc v1.72.0
-)
-
-require (
-	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
+	github.com/golang/protobuf v1.4.2
+	github.com/google/go-cmp v0.5.1 // indirect
+	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
 )
--- a/go.sum
+++ b/go.sum
@@ -1,59 +1,471 @@
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--- a/grpc.go
+++ b/grpc.go
@@ -1,4 +1,4 @@
-// Package grpc provides a gRPC client for micro framework
+// Package grpc provides a gRPC client
 package grpc

 import (
@@ -7,52 +7,51 @@ import (
 	"fmt"
 	"net"
 	"reflect"
-	"strconv"
 	"strings"
 	"sync"
+	"sync/atomic"
 	"time"

-	"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"
+	raw "github.com/unistack-org/micro-codec-bytes"
+	"github.com/unistack-org/micro/v3/broker"
+	"github.com/unistack-org/micro/v3/client"
+	"github.com/unistack-org/micro/v3/errors"
+	"github.com/unistack-org/micro/v3/metadata"
+
 	"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 (
-	DefaultContentType = "application/grpc"
 )

 type grpcClient struct {
-	funcCall   client.FuncCall
-	funcStream client.FuncStream
-	pool       *ConnPool
-	opts       client.Options
-	mu         sync.RWMutex
-	init       bool
+	opts   client.Options
+	codecs map[string]encoding.Codec
+	pool   *pool
+	once   atomic.Value
+	sync.RWMutex
+}
+
+func init() {
+	encoding.RegisterCodec(wrapCodec{jsonCodec{}})
+	encoding.RegisterCodec(wrapCodec{protoCodec{}})
+	encoding.RegisterCodec(wrapCodec{bytesCodec{}})
 }

 // 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.TLSConfig != nil {
-		creds := credentials.NewTLS(g.opts.TLSConfig)
-		// return tls config if it exists
-		return grpc.WithTransportCredentials(creds)
+	if g.opts.Context != nil {
+		if v := g.opts.Context.Value(tlsAuth{}); v != nil {
+			tls := v.(*tls.Config)
+			creds := credentials.NewTLS(tls)
+			// return tls config if it exists
+			return grpc.WithTransportCredentials(creds)
+		}
 	}

 	// default config
-	tlsConfig := &tls.Config{MinVersion: tls.VersionTLS12}
+	tlsConfig := &tls.Config{}
 	defaultCreds := grpc.WithTransportCredentials(credentials.NewTLS(tlsConfig))

 	// check if the address is prepended with https
@@ -70,39 +69,37 @@ func (g *grpcClient) secure(addr string) grpc.DialOption {
 	}

 	// other fallback to insecure
-	return grpc.WithTransportCredentials(insecure.NewCredentials())
+	return grpc.WithInsecure()
 }

 func (g *grpcClient) call(ctx context.Context, addr string, req client.Request, rsp interface{}, opts client.CallOptions) error {
-	var header gmetadata.MD
+	var header map[string]string

-	if md, ok := metadata.FromOutgoingContext(ctx); ok {
-		header = metadata.Copy(md).AsHTTP2()
-	} else {
-		header = make(gmetadata.MD, 4)
-	}
-	if opts.RequestMetadata != nil {
-		for k, v := range opts.RequestMetadata {
+	header = make(map[string]string)
+	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)
 	}
+
 	// set timeout in nanoseconds
-	if opts.RequestTimeout > time.Duration(0) {
-		header.Set("grpc-timeout", fmt.Sprintf("%dn", opts.RequestTimeout))
-		header.Set("timeout", fmt.Sprintf("%dn", opts.RequestTimeout))
-	}
-	header.Set("content-type", req.ContentType())
+	header["timeout"] = fmt.Sprintf("%d", opts.RequestTimeout)
+	// set the content type for the request
+	header["x-content-type"] = req.ContentType()

-	ctx = gmetadata.NewOutgoingContext(ctx, header)
+	md := gmetadata.New(header)
+	ctx = gmetadata.NewOutgoingContext(ctx, md)

-	cf, err := g.newCodec(req.ContentType())
+	cf, err := g.newGRPCCodec(req.ContentType())
 	if err != nil {
-		return errors.InternalServerError("go.micro.client", "%+v", err)
+		return errors.InternalServerError("go.micro.client", err.Error())
 	}

 	maxRecvMsgSize := g.maxRecvMsgSizeValue()
 	maxSendMsgSize := g.maxSendMsgSizeValue()
-	cfgService := g.serviceConfig()

 	var grr error

@@ -121,50 +118,30 @@ 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 {
-		grpcDialOptions = append(grpcDialOptions, opts...)
-	}
-	if opts := g.getGrpcDialOptions(opts.Context); opts != nil {
+	if opts := g.getGrpcDialOptions(); opts != nil {
 		grpcDialOptions = append(grpcDialOptions, opts...)
 	}

-	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...)
+	cc, err := g.pool.getConn(dialCtx, addr, grpcDialOptions...)
 	if err != nil {
-		return errors.InternalServerError("go.micro.client", "Error sending request: %v", err)
+		return errors.InternalServerError("go.micro.client", fmt.Sprintf("Error sending request: %v", err))
 	}
 	defer func() {
 		// defer execution of release
-		g.pool.Put(cc, grr)
+		g.pool.release(addr, cc, grr)
 	}()

 	ch := make(chan error, 1)
-	var gmd gmetadata.MD
-
-	grpcCallOptions := []grpc.CallOption{
-		grpc.CallContentSubtype((&wrapMicroCodec{cf}).Name()),
-	}
-
-	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() {
+		grpcCallOptions := []grpc.CallOption{
+			grpc.ForceCodec(cf),
+			grpc.CallContentSubtype(cf.Name())}
+		if opts := g.getGrpcCallOptions(); opts != nil {
+			grpcCallOptions = append(grpcCallOptions, opts...)
+		}
 		err := cc.Invoke(ctx, methodToGRPC(req.Service(), req.Endpoint()), req.Body(), rsp, grpcCallOptions...)
 		ch <- microError(err)
 	}()
@@ -176,36 +153,34 @@ 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.Append(k, v...)
-		}
-	}
-
 	return grr
 }

 func (g *grpcClient) stream(ctx context.Context, addr string, req client.Request, rsp interface{}, opts client.CallOptions) error {
-	var header gmetadata.MD
+	var header map[string]string

-	if md, ok := metadata.FromOutgoingContext(ctx); ok {
-		header = metadata.Copy(md).AsHTTP2()
+	if md, ok := metadata.FromContext(ctx); ok {
+		header = make(map[string]string, len(md))
+		for k, v := range md {
+			header[k] = v
+		}
 	} else {
-		header = make(gmetadata.MD, 4)
+		header = make(map[string]string)
 	}

-	if opts.RequestTimeout > time.Duration(0) {
-		header.Set("grpc-timeout", fmt.Sprintf("%dn", opts.RequestTimeout))
-		header.Set("timeout", fmt.Sprintf("%dn", opts.RequestTimeout))
+	// set timeout in nanoseconds
+	if opts.StreamTimeout > time.Duration(0) {
+		header["timeout"] = fmt.Sprintf("%d", opts.StreamTimeout)
 	}
-	header.Set("content-type", req.ContentType())
+	// set the content type for the request
+	header["x-content-type"] = req.ContentType()

-	ctx = gmetadata.NewOutgoingContext(ctx, header)
+	md := gmetadata.New(header)
+	ctx = gmetadata.NewOutgoingContext(ctx, md)

-	cf, err := g.newCodec(req.ContentType())
+	cf, err := g.newGRPCCodec(req.ContentType())
 	if err != nil {
-		return errors.InternalServerError("go.micro.client", "%+v", err)
+		return errors.InternalServerError("go.micro.client", err.Error())
 	}

 	var dialCtx context.Context
@@ -217,36 +192,19 @@ func (g *grpcClient) stream(ctx context.Context, addr string, req client.Request
 	}
 	defer cancel()

-	wc := &wrapMicroCodec{cf}
-
-	maxRecvMsgSize := g.maxRecvMsgSizeValue()
-	maxSendMsgSize := g.maxSendMsgSizeValue()
-	cfgService := g.serviceConfig()
+	wc := wrapCodec{cf}

 	grpcDialOptions := []grpc.DialOption{
 		g.secure(addr),
-		grpc.WithDefaultCallOptions(
-			grpc.MaxCallRecvMsgSize(maxRecvMsgSize),
-			grpc.MaxCallSendMsgSize(maxSendMsgSize),
-		),
-		grpc.WithDefaultServiceConfig(cfgService),
 	}

-	if opts := g.getGrpcDialOptions(opts.Context); opts != nil {
+	if opts := g.getGrpcDialOptions(); opts != nil {
 		grpcDialOptions = append(grpcDialOptions, opts...)
 	}

-	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...)
+	cc, err := g.pool.getConn(dialCtx, addr, grpcDialOptions...)
 	if err != nil {
-		return errors.InternalServerError("go.micro.client", "Error sending request: %v", err)
+		return errors.InternalServerError("go.micro.client", fmt.Sprintf("Error sending request: %v", err))
 	}

 	desc := &grpc.StreamDesc{
@@ -256,17 +214,12 @@ func (g *grpcClient) stream(ctx context.Context, addr string, req client.Request
 	}

 	grpcCallOptions := []grpc.CallOption{
-		// grpc.ForceCodec(wc),
-		grpc.CallContentSubtype(wc.Name()),
+		grpc.ForceCodec(wc),
+		grpc.CallContentSubtype(cf.Name()),
 	}
-	if opts := g.getGrpcCallOptions(opts.Context); opts != nil {
+	if opts := g.getGrpcCallOptions(); 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)
@@ -277,14 +230,19 @@ func (g *grpcClient) stream(ctx context.Context, addr string, req client.Request
 		// cancel the context
 		cancel()
 		// release the connection
-		g.pool.Put(cc, err)
+		g.pool.release(addr, cc, err)
 		// now return the error
-		return errors.InternalServerError("go.micro.client", "Error creating stream: %v", err)
+		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 = cf
+		r.codec = codec
 	}

 	// setup the stream response
@@ -296,23 +254,23 @@ 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 occurred
+			// cancel the context if an error occured
 			if err != nil {
 				cancel()
 			}

 			// defer execution of release
-			g.pool.Put(cc, err)
+			g.pool.release(addr, cc, err)
 		},
 	}

 	// set the stream as the response
 	val := reflect.ValueOf(rsp).Elem()
 	val.Set(reflect.ValueOf(stream).Elem())
-
 	return nil
 }

@@ -360,35 +318,17 @@ func (g *grpcClient) maxSendMsgSizeValue() int {
 	return v.(int)
 }

-func (g *grpcClient) newCodec(ct string) (codec.Codec, error) {
-	g.mu.RLock()
-	defer g.mu.RUnlock()
+func (g *grpcClient) newGRPCCodec(contentType string) (encoding.Codec, error) {
+	g.RLock()
+	defer g.RUnlock()

-	if idx := strings.IndexRune(ct, ';'); idx >= 0 {
-		ct = ct[:idx]
+	if c, ok := g.codecs[contentType]; ok {
+		return wrapCodec{c}, nil
 	}
-
-	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)
+	return nil, fmt.Errorf("Unsupported Content-Type: %s", contentType)
 }

 func (g *grpcClient) Init(opts ...client.Option) error {
-	if len(opts) == 0 && g.init {
-		return nil
-	}
 	size := g.opts.PoolSize
 	ttl := g.opts.PoolTTL

@@ -398,25 +338,12 @@ func (g *grpcClient) Init(opts ...client.Option) error {

 	// update pool configuration if the options changed
 	if size != g.opts.PoolSize || ttl != g.opts.PoolTTL {
-		g.pool.mu.Lock()
+		g.pool.Lock()
 		g.pool.size = g.opts.PoolSize
 		g.pool.ttl = int64(g.opts.PoolTTL.Seconds())
-		g.pool.mu.Unlock()
+		g.pool.Unlock()
 	}

-	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
 }

@@ -424,6 +351,10 @@ 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...)
 }
@@ -434,35 +365,8 @@ 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
-
 	for _, opt := range opts {
 		opt(&callOpts)
 	}
@@ -491,6 +395,11 @@ func (g *grpcClient) fnCall(ctx context.Context, req client.Request, rsp interfa
 	// 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
@@ -506,13 +415,25 @@ func (g *grpcClient) fnCall(ctx context.Context, req client.Request, rsp interfa
 		callOpts.Address = []string{g.opts.Proxy}
 	}

-	var next selector.Next
+	// 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
+	}
+
+	// return errors.New("go.micro.client", "request timeout", 408)
 	call := func(i int) error {
 		// call backoff first. Someone may want an initial start delay
 		t, err := callOpts.Backoff(ctx, req, i)
 		if err != nil {
-			return errors.InternalServerError("go.micro.client", "%+v", err)
+			return errors.InternalServerError("go.micro.client", err.Error())
 		}

 		// only sleep if greater than 0
@@ -520,23 +441,6 @@ func (g *grpcClient) fnCall(ctx context.Context, req client.Request, rsp interfa
 			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", "%+v", err)
-			}
-
-			// balance the list of nodes
-			next, err = callOpts.Selector.Select(routes)
-			if err != nil {
-				return err
-			}
-		}
-
 		// get the next node
 		node := next()

@@ -590,31 +494,6 @@ func (g *grpcClient) fnCall(ctx context.Context, req client.Request, rsp interfa
 }

 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 {
@@ -633,6 +512,11 @@ func (g *grpcClient) fnStream(ctx context.Context, req client.Request, opts ...c
 	// 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
@@ -648,13 +532,24 @@ func (g *grpcClient) fnStream(ctx context.Context, req client.Request, opts ...c
 		callOpts.Address = []string{g.opts.Proxy}
 	}

-	var next selector.Next
+	// lookup the route to send the reques to
+	// 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
 		t, err := callOpts.Backoff(ctx, req, i)
 		if err != nil {
-			return nil, errors.InternalServerError("go.micro.client", "%+v", err)
+			return nil, errors.InternalServerError("go.micro.client", err.Error())
 		}

 		// only sleep if greater than 0
@@ -662,29 +557,12 @@ func (g *grpcClient) fnStream(ctx context.Context, req client.Request, opts ...c
 			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", "%+v", err)
-			}
-
-			// 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 = gstream(ctx, node, req, stream, callOpts)
+		err = g.stream(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 {
@@ -696,10 +574,7 @@ func (g *grpcClient) fnStream(ctx context.Context, req client.Request, opts ...c
 			return nil, verr
 		}

-		if rerr := g.opts.Selector.Record(node, err); rerr != nil {
-			return nil, rerr
-		}
-
+		g.opts.Selector.Record(node, err)
 		return stream, err
 	}

@@ -742,85 +617,145 @@ func (g *grpcClient) fnStream(ctx context.Context, req client.Request, opts ...c
 	return nil, grr
 }

+func (g *grpcClient) Publish(ctx context.Context, p client.Message, opts ...client.PublishOption) error {
+	var options client.PublishOptions
+	var body []byte
+
+	// fail early on connect error
+	if !g.once.Load().(bool) {
+		if err := g.opts.Broker.Connect(); err != nil {
+			return errors.InternalServerError("go.micro.client", err.Error())
+		}
+		g.once.Store(true)
+	}
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	md, ok := metadata.FromContext(ctx)
+	if !ok {
+		md = make(map[string]string)
+	}
+	md["Content-Type"] = p.ContentType()
+	md["Micro-Topic"] = p.Topic()
+
+	// passed in raw data
+	if d, ok := p.Payload().(*raw.Frame); ok {
+		body = d.Data
+	} else {
+		// use codec for payload
+		cf, err := g.newGRPCCodec(p.ContentType())
+		if err != nil {
+			return errors.InternalServerError("go.micro.client", err.Error())
+		}
+		// set the body
+		b, err := cf.Marshal(p.Payload())
+		if err != nil {
+			return errors.InternalServerError("go.micro.client", err.Error())
+		}
+		body = b
+	}
+
+	topic := p.Topic()
+
+	// get the exchange
+	if len(options.Exchange) > 0 {
+		topic = options.Exchange
+	}
+
+	return g.opts.Broker.Publish(topic, &broker.Message{
+		Header: md,
+		Body:   body,
+	}, broker.PublishContext(options.Context))
+}
+
 func (g *grpcClient) String() string {
 	return "grpc"
 }

-func (g *grpcClient) Name() string {
-	return g.opts.Name
-}
-
-func (g *grpcClient) getGrpcDialOptions(ctx context.Context) []grpc.DialOption {
-	var opts []grpc.DialOption
-
-	if g.opts.CallOptions.Context != nil {
-		if v := g.opts.CallOptions.Context.Value(grpcDialOptions{}); v != nil {
-			if vopts, ok := v.([]grpc.DialOption); ok {
-				opts = append(opts, vopts...)
-			}
-		}
+func (g *grpcClient) getGrpcDialOptions() []grpc.DialOption {
+	if g.opts.CallOptions.Context == nil {
+		return nil
 	}

-	if ctx != nil {
-		if v := ctx.Value(grpcDialOptions{}); v != nil {
-			if vopts, ok := v.([]grpc.DialOption); ok {
-				opts = append(opts, vopts...)
-			}
-		}
+	v := g.opts.CallOptions.Context.Value(grpcDialOptions{})
+
+	if v == nil {
+		return nil
+	}
+
+	opts, ok := v.([]grpc.DialOption)
+
+	if !ok {
+		return nil
 	}

 	return opts
 }

-func (g *grpcClient) getGrpcCallOptions(ctx context.Context) []grpc.CallOption {
-	var opts []grpc.CallOption
-
-	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...)
-			}
-		}
+func (g *grpcClient) getGrpcCallOptions() []grpc.CallOption {
+	if g.opts.CallOptions.Context == nil {
+		return nil
 	}

-	if ctx != nil {
-		if v := ctx.Value(grpcCallOptions{}); v != nil {
-			if vopts, ok := v.([]grpc.CallOption); ok {
-				opts = append(opts, vopts...)
-			}
-		}
+	v := g.opts.CallOptions.Context.Value(grpcCallOptions{})
+
+	if v == nil {
+		return nil
+	}
+
+	opts, ok := v.([]grpc.CallOption)
+
+	if !ok {
+		return nil
 	}

 	return opts
 }

-func NewClient(opts ...client.Option) client.Client {
-	options := client.NewOptions(opts...)
+func newClient(opts ...client.Option) client.Client {
+	options := client.NewOptions()
 	// default content type for grpc
-	if options.ContentType == "" {
-		options.ContentType = DefaultContentType
+	options.ContentType = "application/grpc+proto"
+
+	for _, o := range opts {
+		o(&options)
 	}

-	c := &grpcClient{
+	rc := &grpcClient{
 		opts: options,
 	}
+	rc.once.Store(false)

-	c.pool = NewConnPool(options.PoolSize, options.PoolTTL, c.poolMaxIdle(), c.poolMaxStreams())
+	rc.pool = newPool(options.PoolSize, options.PoolTTL, rc.poolMaxIdle(), rc.poolMaxStreams())

-	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 {
-				c.opts.Codecs[k] = &wrapGrpcCodec{v}
-			}
+	c := client.Client(rc)
+
+	// wrap in reverse
+	for i := len(options.Wrappers); i > 0; i-- {
+		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 {
+			codecs = v.(map[string]encoding.Codec)
 		}
 	}

-	for _, k := range options.Codecs {
-		encoding.RegisterCodec(&wrapMicroCodec{k})
+	for k, v := range codecs {
+		rc.codecs[k] = v
 	}

-	c.funcCall = c.fnCall
-	c.funcStream = c.fnStream
-
 	return c
 }
+
+func NewClient(opts ...client.Option) client.Client {
+	return newClient(opts...)
+}
--- a/grpc_pool.go
+++ b/grpc_pool.go
@@ -2,7 +2,6 @@ package grpc

 import (
 	"context"
-	"strings"
 	"sync"
 	"time"

@@ -10,47 +9,56 @@ import (
 	"google.golang.org/grpc/connectivity"
 )

-type ConnPool struct {
-	conns      map[string]*streamsPool
-	size       int
-	ttl        int64
+type pool struct {
+	size int
+	ttl  int64
+
+	//  max streams on a *poolConn
 	maxStreams int
-	maxIdle    int
-	mu         sync.Mutex
+	//  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 {
-	err error
+type poolConn struct {
+	//  grpc conn
 	*grpc.ClientConn
-	next    *PoolConn
-	pool    *ConnPool
+	err  error
+	addr string
+
+	//  pool and streams pool
+	pool    *pool
 	sp      *streamsPool
-	pre     *PoolConn
-	addr    string
 	streams int
 	created int64
-	in      bool
+
+	//  list
+	pre  *poolConn
+	next *poolConn
+	in   bool
 }

-func NewConnPool(size int, ttl time.Duration, idle int, ms int) *ConnPool {
+func newPool(size int, ttl time.Duration, idle int, ms int) *pool {
 	if ms <= 0 {
 		ms = 1
 	}
 	if idle < 0 {
 		idle = 0
 	}
-	return &ConnPool{
+	return &pool{
 		size:       size,
 		ttl:        int64(ttl.Seconds()),
 		maxStreams: ms,
@@ -59,15 +67,12 @@ 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) {
-	if strings.HasPrefix(addr, "http") {
-		addr = addr[strings.Index(addr, ":")+3:]
-	}
+func (p *pool) getConn(ctx context.Context, addr string, opts ...grpc.DialOption) (*poolConn, error) {
 	now := time.Now().Unix()
-	p.mu.Lock()
+	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
@@ -125,37 +130,37 @@ func (p *ConnPool) Get(ctx context.Context, addr string, opts ...grpc.DialOption
 		}
 		//  a good conn
 		conn.streams++
-		p.mu.Unlock()
+		p.Unlock()
 		return conn, nil
 	}
-	p.mu.Unlock()
+	p.Unlock()

-	// nolint (TODO need fix)  create new conn)
+	//  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{cc, nil, addr, p, sp, 1, time.Now().Unix(), nil, nil, false}

 	//  add conn to streams pool
-	p.mu.Lock()
+	p.Lock()
 	if sp.count < p.size {
 		addConnAfter(conn, sp.head)
 	}
-	p.mu.Unlock()
+	p.Unlock()

 	return conn, nil
 }

-func (p *ConnPool) Put(conn *PoolConn, err error) {
-	p.mu.Lock()
+func (p *pool) release(addr string, conn *poolConn, err error) {
+	p.Lock()
 	p, sp, created := conn.pool, conn.sp, conn.created
 	//  try to add conn
 	if !conn.in && sp.count < p.size {
 		addConnAfter(conn, sp.head)
 	}
 	if !conn.in {
-		p.mu.Unlock()
+		p.Unlock()
 		conn.ClientConn.Close()
 		return
 	}
@@ -173,20 +178,21 @@ func (p *ConnPool) Put(conn *PoolConn, err error) {
 		now := time.Now().Unix()
 		if err != nil || sp.idle >= p.maxIdle || now-created > p.ttl {
 			removeConn(conn)
-			p.mu.Unlock()
+			p.Unlock()
 			conn.ClientConn.Close()
 			return
 		}
 		sp.idle++
 	}
-	p.mu.Unlock()
+	p.Unlock()
+	return
 }

-func (conn *PoolConn) Close() {
-	conn.pool.Put(conn, conn.err)
+func (conn *poolConn) Close() {
+	conn.pool.release(conn.addr, conn, conn.err)
 }

-func removeConn(conn *PoolConn) {
+func removeConn(conn *poolConn) {
 	if conn.pre != nil {
 		conn.pre.next = conn.next
 	}
@@ -197,9 +203,10 @@ 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 {
@@ -208,4 +215,5 @@ func addConnAfter(conn *PoolConn, after *PoolConn) {
 	after.next = conn
 	conn.in = true
 	conn.sp.count++
+	return
 }
--- a/message.go
+++ b/message.go
@@ -0,0 +1,40 @@
+package grpc
+
+import (
+	"github.com/unistack-org/micro/v3/client"
+)
+
+type grpcEvent struct {
+	topic       string
+	contentType string
+	payload     interface{}
+}
+
+func newGRPCEvent(topic string, payload interface{}, contentType string, opts ...client.MessageOption) client.Message {
+	var options client.MessageOptions
+	for _, o := range opts {
+		o(&options)
+	}
+
+	if len(options.ContentType) > 0 {
+		contentType = options.ContentType
+	}
+
+	return &grpcEvent{
+		payload:     payload,
+		topic:       topic,
+		contentType: contentType,
+	}
+}
+
+func (g *grpcEvent) ContentType() string {
+	return g.contentType
+}
+
+func (g *grpcEvent) Topic() string {
+	return g.topic
+}
+
+func (g *grpcEvent) Payload() interface{} {
+	return g.payload
+}
--- a/options.go
+++ b/options.go
@@ -3,14 +3,15 @@ package grpc

 import (
 	"context"
+	"crypto/tls"

-	"go.unistack.org/micro/v4/client"
+	"github.com/unistack-org/micro/v3/client"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/encoding"
 )

 var (
-	// DefaultPoolMaxStreams maximum streams on a connection
+	// DefaultPoolMaxStreams maximum streams on a connectioin
 	// (20)
 	DefaultPoolMaxStreams = 20

@@ -25,12 +26,16 @@ 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 {
@@ -42,8 +47,6 @@ 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) {
@@ -54,8 +57,6 @@ 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) {
@@ -71,9 +72,19 @@ func Codec(contentType string, c encoding.Codec) client.Option {
 	}
 }

-type maxRecvMsgSizeKey struct{}
+// AuthTLS should be used to setup a secure authentication using TLS
+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 {
@@ -83,9 +94,9 @@ 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 {
@@ -95,11 +106,11 @@ func MaxSendMsgSize(s int) client.Option {
 	}
 }

-type grpcDialOptions struct{}
-
+//
 // DialOptions to be used to configure gRPC dial options
-func DialOptions(opts ...grpc.DialOption) client.Option {
-	return func(o *client.Options) {
+//
+func DialOptions(opts ...grpc.DialOption) client.CallOption {
+	return func(o *client.CallOptions) {
 		if o.Context == nil {
 			o.Context = context.Background()
 		}
@@ -107,9 +118,9 @@ func DialOptions(opts ...grpc.DialOption) client.Option {
 	}
 }

-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 {
@@ -118,14 +129,3 @@ 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)
-	}
-}
--- a/request.go
+++ b/request.go
@@ -4,17 +4,17 @@ import (
 	"fmt"
 	"strings"

-	"go.unistack.org/micro/v4/client"
-	"go.unistack.org/micro/v4/codec"
+	"github.com/unistack-org/micro/v3/client"
+	"github.com/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
@@ -38,12 +38,15 @@ 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, opts ...client.RequestOption) client.Request {
-	options := client.NewRequestOptions(opts...)
+func newGRPCRequest(service, method string, request interface{}, contentType string, reqOpts ...client.RequestOption) client.Request {
+	var opts client.RequestOptions
+	for _, o := range reqOpts {
+		o(&opts)
+	}

 	// set the content-type specified
-	if len(options.ContentType) > 0 {
-		contentType = options.ContentType
+	if len(opts.ContentType) > 0 {
+		contentType = opts.ContentType
 	}

 	return &grpcRequest{
@@ -51,7 +54,7 @@ func newGRPCRequest(service, method string, request interface{}, contentType str
 		method:      method,
 		request:     request,
 		contentType: contentType,
-		opts:        options,
+		opts:        opts,
 	}
 }

@@ -71,7 +74,7 @@ func (g *grpcRequest) Endpoint() string {
 	return g.method
 }

-func (g *grpcRequest) Codec() codec.Codec {
+func (g *grpcRequest) Codec() codec.Writer {
 	return g.codec
 }

--- a/response.go
+++ b/response.go
@@ -1,41 +1,44 @@
 package grpc

 import (
-	"go.unistack.org/micro/v4/codec"
-	"go.unistack.org/micro/v4/metadata"
+	"strings"
+
+	"github.com/unistack-org/micro/v3/codec"
+	"github.com/unistack-org/micro-codec-bytes"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/encoding"
 )

 type response struct {
-	conn   *PoolConn
+	conn   *poolConn
 	stream grpc.ClientStream
-	codec  codec.Codec
+	codec  encoding.Codec
+	gcodec codec.Codec
 }

 // Read the response
-func (r *response) Codec() codec.Codec {
-	return r.codec
+func (r *response) Codec() codec.Reader {
+	return r.gcodec
 }

 // read the header
-func (r *response) Header() metadata.Metadata {
-	meta, err := r.stream.Header()
+func (r *response) Header() map[string]string {
+	md, err := r.stream.Header()
 	if err != nil {
-		return nil
+		return map[string]string{}
 	}
-
-	return metadata.Metadata(meta.Copy())
+	hdr := make(map[string]string, len(md))
+	for k, v := range md {
+		hdr[k] = strings.Join(v, ",")
+	}
+	return hdr
 }

 // Read the undecoded response
 func (r *response) Read() ([]byte, error) {
-	f := &codec.Frame{}
-	wrap := &wrapStream{r.stream}
-
-	_, err := wrap.Read(f.Data)
-	if err != nil {
+	f := &bytes.Frame{}
+	if err := r.gcodec.ReadBody(f); err != nil {
 		return nil, err
 	}
-
 	return f.Data, nil
 }
--- a/stream.go
+++ b/stream.go
@@ -5,22 +5,23 @@ import (
 	"io"
 	"sync"

-	"go.unistack.org/micro/v4/client"
-	"go.unistack.org/micro/v4/tracer"
+	"github.com/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
-	mu       sync.RWMutex
-	closed   bool
 }

 func (g *grpcStream) Context() context.Context {
@@ -43,14 +44,6 @@ 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)

@@ -69,34 +62,16 @@ 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.mu.RLock()
-	defer g.mu.RUnlock()
+	g.RLock()
+	defer g.RUnlock()
 	return g.err
 }

 func (g *grpcStream) setError(e error) {
-	g.mu.Lock()
+	g.Lock()
 	g.err = e
-	g.mu.Unlock()
+	g.Unlock()
 }

 // Close the gRPC send stream
@@ -105,28 +80,8 @@ func (g *grpcStream) setError(e error) {
 // stream should still be able to receive after this function call
 // TODO: should the conn be closed in another way?
 func (g *grpcStream) Close() error {
-	g.mu.Lock()
-	defer g.mu.Unlock()
-
-	if g.closed {
-		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)
-	return g.ClientStream.CloseSend()
-}
-
-func (g *grpcStream) CloseSend() error {
-	g.mu.Lock()
-	defer g.mu.Unlock()
+	g.Lock()
+	defer g.Unlock()

 	if g.closed {
 		return nil