update ci (#191)

* rename .gitea to .github

* attempt to fix lint/test job

.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
+```

.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.

.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

.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 }}

.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

README.md

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

codec.go

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

codec_test.go

@@ -2,10 +2,9 @@ package grpc
 
 import (
 	"context"
-	"testing"
+	"go.unistack.org/micro/v3/codec"
-
-	"go.unistack.org/micro/v4/codec"
 	gmetadata "google.golang.org/grpc/metadata"
+	"testing"
 )
 
 type mockStream struct {

error.go

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

go.mod

@@ -1,24 +1,19 @@
-module go.unistack.org/micro-client-grpc/v4
+module go.unistack.org/micro-client-grpc/v3
 
-go 1.23.0
+go 1.21
 
-toolchain go1.23.3
+toolchain go1.23.1
 
 require (
-	go.unistack.org/micro/v4 v4.1.7
+	go.unistack.org/micro/v3 v3.10.91
-	google.golang.org/grpc v1.72.0
+	google.golang.org/grpc v1.67.0
 )
 
 require (
-	github.com/ash3in/uuidv8 v1.2.0 // indirect
+	go.unistack.org/micro-proto/v3 v3.4.1 // indirect
-	github.com/google/uuid v1.6.0 // indirect
+	golang.org/x/net v0.29.0 // indirect
-	github.com/matoous/go-nanoid v1.5.1 // indirect
+	golang.org/x/sys v0.25.0 // indirect
-	github.com/spf13/cast v1.7.1 // indirect
+	golang.org/x/text v0.18.0 // indirect
-	go.unistack.org/micro-proto/v4 v4.1.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240903143218-8af14fe29dc1 // indirect
-	golang.org/x/net v0.39.0 // indirect
+	google.golang.org/protobuf v1.34.2 // 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

@@ -1,59 +1,18 @@
-github.com/DATA-DOG/go-sqlmock v1.5.2 h1:OcvFkGmslmlZibjAjaHm3L//6LiuBgolP7OputlJIzU=
-github.com/DATA-DOG/go-sqlmock v1.5.2/go.mod h1:88MAG/4G7SMwSE3CeA0ZKzrT5CiOU3OJ+JlNzwDqpNU=
-github.com/ash3in/uuidv8 v1.2.0 h1:2oogGdtCPwaVtyvPPGin4TfZLtOGE5F+W++E880G6SI=
-github.com/ash3in/uuidv8 v1.2.0/go.mod h1:BnU0wJBxnzdEKmVg4xckBkD+VZuecTFTUP3M0dWgyY4=
-github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
-github.com/frankban/quicktest v1.14.6/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0=
-github.com/go-logr/logr v1.4.2 h1:6pFjapn8bFcIbiKo3XT4j/BhANplGihG6tvd+8rYgrY=
-github.com/go-logr/logr v1.4.2/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
-github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
-github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
-github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
-github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
-github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+go.unistack.org/micro-proto/v3 v3.4.1 h1:UTjLSRz2YZuaHk9iSlVqqsA50JQNAEK2ZFboGqtEa9Q=
-github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+go.unistack.org/micro-proto/v3 v3.4.1/go.mod h1:okx/cnOhzuCX0ggl/vToatbCupi0O44diiiLLsZ93Zo=
-github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+go.unistack.org/micro/v3 v3.10.91 h1:vuJY4tXwpqimwIkEJ3TozMYNVQQs+C5QMlQWPgSY/YM=
-github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
+go.unistack.org/micro/v3 v3.10.91/go.mod h1:erMgt3Bl7vQQ0e9UpQyR5NlLiZ9pKeEJ9+1tfYFaqUg=
-github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+golang.org/x/net v0.29.0 h1:5ORfpBpCs4HzDYoodCDBbwHzdR5UrLBZ3sOnUJmFoHo=
-github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+golang.org/x/net v0.29.0/go.mod h1:gLkgy8jTGERgjzMic6DS9+SP0ajcu6Xu3Orq/SpETg0=
-github.com/matoous/go-nanoid v1.5.1 h1:aCjdvTyO9LLnTIi0fgdXhOPPvOHjpXN6Ik9DaNjIct4=
+golang.org/x/sys v0.25.0 h1:r+8e+loiHxRqhXVl6ML1nO3l1+oFoWbnlu2Ehimmi34=
-github.com/matoous/go-nanoid v1.5.1/go.mod h1:zyD2a71IubI24efhpvkJz+ZwfwagzgSO6UNiFsZKN7U=
+golang.org/x/sys v0.25.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-github.com/rogpeppe/go-internal v1.13.1 h1:KvO1DLK/DRN07sQ1LQKScxyZJuNnedQ5/wKSR38lUII=
+golang.org/x/text v0.18.0 h1:XvMDiNzPAl0jr17s6W9lcaIhGUfUORdGCNsuLmPG224=
-github.com/rogpeppe/go-internal v1.13.1/go.mod h1:uMEvuHeurkdAXX61udpOXGD/AzZDWNMNyH2VO9fmH0o=
+golang.org/x/text v0.18.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=
-github.com/spf13/cast v1.7.1 h1:cuNEagBQEHWN1FnbGEjCXL2szYEXqfJPbP2HNUaca9Y=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240903143218-8af14fe29dc1 h1:pPJltXNxVzT4pK9yD8vR9X75DaWYYmLGMsEvBfFQZzQ=
-github.com/spf13/cast v1.7.1/go.mod h1:ancEpBxwJDODSW/UG4rDrAqiKolqNNh2DX3mk86cAdo=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240903143218-8af14fe29dc1/go.mod h1:UqMtugtsSgubUsoxbuAoiCXvqvErP7Gf0so0mK9tHxU=
-go.opentelemetry.io/auto/sdk v1.1.0 h1:cH53jehLUN6UFLY71z+NDOiNJqDdPRaXzTel0sJySYA=
+google.golang.org/grpc v1.67.0 h1:IdH9y6PF5MPSdAntIcpjQ+tXO41pcQsfZV2RxtQgVcw=
-go.opentelemetry.io/auto/sdk v1.1.0/go.mod h1:3wSPjt5PWp2RhlCcmmOial7AvC4DQqZb7a7wCow3W8A=
+google.golang.org/grpc v1.67.0/go.mod h1:1gLDyUQU7CTLJI90u3nXZ9ekeghjeM7pTDZlqFNg2AA=
-go.opentelemetry.io/otel v1.34.0 h1:zRLXxLCgL1WyKsPVrgbSdMN4c0FMkDAskSTQP+0hdUY=
+google.golang.org/protobuf v1.34.2 h1:6xV6lTsCfpGD21XK49h7MhtcApnLqkfYgPcdHftf6hg=
-go.opentelemetry.io/otel v1.34.0/go.mod h1:OWFPOQ+h4G8xpyjgqo4SxJYdDQ/qmRH+wivy7zzx9oI=
+google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw=
-go.opentelemetry.io/otel/metric v1.34.0 h1:+eTR3U0MyfWjRDhmFMxe2SsW64QrZ84AOhvqS7Y+PoQ=
-go.opentelemetry.io/otel/metric v1.34.0/go.mod h1:CEDrp0fy2D0MvkXE+dPV7cMi8tWZwX3dmaIhwPOaqHE=
-go.opentelemetry.io/otel/sdk v1.34.0 h1:95zS4k/2GOy069d321O8jWgYsW3MzVV+KuSPKp7Wr1A=
-go.opentelemetry.io/otel/sdk v1.34.0/go.mod h1:0e/pNiaMAqaykJGKbi+tSjWfNNHMTxoC9qANsCzbyxU=
-go.opentelemetry.io/otel/sdk/metric v1.34.0 h1:5CeK9ujjbFVL5c1PhLuStg1wxA7vQv7ce1EK0Gyvahk=
-go.opentelemetry.io/otel/sdk/metric v1.34.0/go.mod h1:jQ/r8Ze28zRKoNRdkjCZxfs6YvBTG1+YIqyFVFYec5w=
-go.opentelemetry.io/otel/trace v1.34.0 h1:+ouXS2V8Rd4hp4580a8q23bg0azF2nI8cqLYnC8mh/k=
-go.opentelemetry.io/otel/trace v1.34.0/go.mod h1:Svm7lSjQD7kG7KJ/MUHPVXSDGz2OX4h0M2jHBhmSfRE=
-go.unistack.org/micro-proto/v4 v4.1.0 h1:qPwL2n/oqh9RE3RTTDgt28XK3QzV597VugQPaw9lKUk=
-go.unistack.org/micro-proto/v4 v4.1.0/go.mod h1:ArmK7o+uFvxSY3dbJhKBBX4Pm1rhWdLEFf3LxBrMtec=
-go.unistack.org/micro/v4 v4.1.7 h1:4/dSEMTqxYoHimn/8wKDohfTXi2zDy6eWXYBCnBaZdc=
-go.unistack.org/micro/v4 v4.1.7/go.mod h1:lr3oYED8Ay1vjK68QqRw30QOtdk/ffpZqMFDasOUhKw=
-golang.org/x/net v0.39.0 h1:ZCu7HMWDxpXpaiKdhzIfaltL9Lp31x/3fCP11bc6/fY=
-golang.org/x/net v0.39.0/go.mod h1:X7NRbYVEA+ewNkCNyJ513WmMdQ3BineSwVtN2zD/d+E=
-golang.org/x/sys v0.32.0 h1:s77OFDvIQeibCmezSnk/q6iAfkdiQaJi4VzroCFrN20=
-golang.org/x/sys v0.32.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
-golang.org/x/text v0.24.0 h1:dd5Bzh4yt5KYA8f9CJHCP4FB4D51c2c6JvN37xJJkJ0=
-golang.org/x/text v0.24.0/go.mod h1:L8rBsPeo2pSS+xqN0d5u2ikmjtmoJbDBT1b7nHvFCdU=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20250425173222-7b384671a197 h1:29cjnHVylHwTzH66WfFZqgSQgnxzvWE+jvBwpZCLRxY=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20250425173222-7b384671a197/go.mod h1:qQ0YXyHHx3XkvlzUtpXDkS29lDSafHMZBAZDc03LQ3A=
-google.golang.org/grpc v1.72.0 h1:S7UkcVa60b5AAQTaO6ZKamFp1zMZSU0fGDK2WZLbBnM=
-google.golang.org/grpc v1.72.0/go.mod h1:wH5Aktxcg25y1I3w7H69nHfXdOG3UiadoBtjh3izSDM=
-google.golang.org/protobuf v1.36.6 h1:z1NpPI8ku2WgiWnf+t9wTPsn6eP1L7ksHUlkfLvd9xY=
-google.golang.org/protobuf v1.36.6/go.mod h1:jduwjTPXsFjZGTmRluh+L6NjiWu7pchiJ2/5YcXBHnY=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
-gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
-gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
-gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

grpc.go

@@ -6,20 +6,22 @@ import (
 	"crypto/tls"
 	"fmt"
 	"net"
+	"os"
 	"reflect"
 	"strconv"
 	"strings"
 	"sync"
 	"time"
 
-	"go.unistack.org/micro/v4/client"
+	"go.unistack.org/micro/v3/broker"
-	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v4/errors"
+	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v3/errors"
-	"go.unistack.org/micro/v4/options"
+	"go.unistack.org/micro/v3/metadata"
-	"go.unistack.org/micro/v4/selector"
+	"go.unistack.org/micro/v3/options"
-	"go.unistack.org/micro/v4/semconv"
+	"go.unistack.org/micro/v3/selector"
-	"go.unistack.org/micro/v4/tracer"
+	"go.unistack.org/micro/v3/semconv"
+	"go.unistack.org/micro/v3/tracer"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/credentials"
@@ -34,12 +36,14 @@ const (
 )
 
 type grpcClient struct {
-	funcCall   client.FuncCall
+	funcPublish      client.FuncPublish
-	funcStream client.FuncStream
+	funcBatchPublish client.FuncBatchPublish
-	pool       *ConnPool
+	funcCall         client.FuncCall
-	opts       client.Options
+	funcStream       client.FuncStream
-	mu         sync.RWMutex
+	pool             *ConnPool
-	init       bool
+	opts             client.Options
+	sync.RWMutex
+	init bool
 }
 
 // secure returns the dial option for whether its a secure or insecure connection
@@ -74,26 +78,28 @@ 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 gmetadata.MD
+	var header map[string]string
 
 	if md, ok := metadata.FromOutgoingContext(ctx); ok {
-		header = metadata.Copy(md).AsHTTP2()
+		header = make(map[string]string, len(md))
+		for k, v := range md {
+			header[strings.ToLower(k)] = v
+		}
 	} else {
-		header = make(gmetadata.MD, 4)
+		header = make(map[string]string, 2)
 	}
 	if opts.RequestMetadata != nil {
 		for k, v := range opts.RequestMetadata {
-			header[strings.ToLower(k)] = v
+			header[k] = v
 		}
 	}
 	// set timeout in nanoseconds
-	if opts.RequestTimeout > time.Duration(0) {
+	header["Grpc-Timeout"] = fmt.Sprintf("%dn", opts.RequestTimeout)
-		header.Set("grpc-timeout", fmt.Sprintf("%dn", opts.RequestTimeout))
+	header["timeout"] = fmt.Sprintf("%dn", opts.RequestTimeout)
-		header.Set("timeout", fmt.Sprintf("%dn", opts.RequestTimeout))
+	header["content-type"] = req.ContentType()
-	}
-	header.Set("content-type", req.ContentType())
 
-	ctx = gmetadata.NewOutgoingContext(ctx, header)
+	md := gmetadata.New(header)
+	ctx = gmetadata.NewOutgoingContext(ctx, md)
 
 	cf, err := g.newCodec(req.ContentType())
 	if err != nil {
@@ -179,7 +185,7 @@ 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.Append(k, v...)
+			opts.ResponseMetadata.Set(k, strings.Join(v, ","))
 		}
 	}
 
@@ -187,21 +193,27 @@ 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 gmetadata.MD
+	var header map[string]string
 
 	if md, ok := metadata.FromOutgoingContext(ctx); ok {
-		header = metadata.Copy(md).AsHTTP2()
+		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) {
+	// set timeout in nanoseconds
-		header.Set("grpc-timeout", fmt.Sprintf("%dn", opts.RequestTimeout))
+	if opts.StreamTimeout > time.Duration(0) {
-		header.Set("timeout", fmt.Sprintf("%dn", opts.RequestTimeout))
+		header["Grpc-Timeout"] = fmt.Sprintf("%dn", opts.StreamTimeout)
+		header["timeout"] = fmt.Sprintf("%dn", opts.StreamTimeout)
 	}
-	header.Set("content-type", req.ContentType())
+	// set the content type for the request
+	header["content-type"] = req.ContentType()
 
-	ctx = gmetadata.NewOutgoingContext(ctx, header)
+	md := gmetadata.New(header)
+	ctx = gmetadata.NewOutgoingContext(ctx, md)
 
 	cf, err := g.newCodec(req.ContentType())
 	if err != nil {
@@ -361,8 +373,8 @@ func (g *grpcClient) maxSendMsgSizeValue() int {
 }
 
 func (g *grpcClient) newCodec(ct string) (codec.Codec, error) {
-	g.mu.RLock()
+	g.RLock()
-	defer g.mu.RUnlock()
+	defer g.RUnlock()
 
 	if idx := strings.IndexRune(ct, ';'); idx >= 0 {
 		ct = ct[:idx]
@@ -398,14 +410,16 @@ 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.funcPublish = g.fnPublish
+	g.funcBatchPublish = g.fnBatchPublish
 
 	g.opts.Hooks.EachPrev(func(hook options.Hook) {
 		switch h := hook.(type) {
@@ -413,9 +427,12 @@ func (g *grpcClient) Init(opts ...client.Option) error {
 			g.funcCall = h(g.funcCall)
 		case client.HookStream:
 			g.funcStream = h(g.funcStream)
+		case client.HookPublish:
+			g.funcPublish = h(g.funcPublish)
+		case client.HookBatchPublish:
+			g.funcBatchPublish = h(g.funcBatchPublish)
 		}
 	})
-	g.init = true
 
 	return nil
 }
@@ -424,6 +441,10 @@ 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...)
 }
@@ -742,6 +763,84 @@ func (g *grpcClient) fnStream(ctx context.Context, req client.Request, opts ...c
 	return nil, grr
 }
 
+func (g *grpcClient) BatchPublish(ctx context.Context, ps []client.Message, opts ...client.PublishOption) error {
+	return g.funcBatchPublish(ctx, ps, opts...)
+}
+
+func (g *grpcClient) fnBatchPublish(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.funcPublish(ctx, p, opts...)
+}
+
+func (g *grpcClient) fnPublish(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)
+		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)
+		}
+
+		md[metadata.HeaderContentType] = p.ContentType()
+
+		// 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", "%+v", err)
+			}
+			// set the body
+			b, err := cf.Marshal(p.Payload())
+			if err != nil {
+				return errors.InternalServerError("go.micro.client", "%+v", err)
+			}
+			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"
 }
@@ -821,6 +920,8 @@ func NewClient(opts ...client.Option) client.Client {
 
 	c.funcCall = c.fnCall
 	c.funcStream = c.fnStream
+	c.funcPublish = c.fnPublish
+	c.funcBatchPublish = c.fnBatchPublish
 
 	return c
 }

grpc_pool.go

@@ -16,7 +16,7 @@ type ConnPool struct {
 	ttl        int64
 	maxStreams int
 	maxIdle    int
-	mu         sync.Mutex
+	sync.Mutex
 }
 
 type streamsPool struct {
@@ -64,7 +64,7 @@ func (p *ConnPool) Get(ctx context.Context, addr string, opts ...grpc.DialOption
 		addr = addr[strings.Index(addr, ":")+3:]
 	}
 	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}
@@ -125,10 +125,10 @@ 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)
 	cc, err := grpc.DialContext(ctx, addr, opts...)
@@ -138,24 +138,24 @@ func (p *ConnPool) Get(ctx context.Context, addr string, opts ...grpc.DialOption
 	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.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()
+	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
 	}
@@ -173,13 +173,13 @@ 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()
 }
 
 func (conn *PoolConn) Close() {

message.go

@@ -0,0 +1,44 @@
+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

@@ -4,7 +4,7 @@ package grpc
 import (
 	"context"
 
-	"go.unistack.org/micro/v4/client"
+	"go.unistack.org/micro/v3/client"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/encoding"
 )

request.go

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

response.go

@@ -1,8 +1,10 @@
 package grpc
 
 import (
-	"go.unistack.org/micro/v4/codec"
+	"strings"
-	"go.unistack.org/micro/v4/metadata"
+
+	"go.unistack.org/micro/v3/codec"
+	"go.unistack.org/micro/v3/metadata"
 	"google.golang.org/grpc"
 )
 
@@ -23,19 +25,14 @@ func (r *response) Header() metadata.Metadata {
 	if err != nil {
 		return nil
 	}
-
+	md := metadata.New(len(meta))
-	return metadata.Metadata(meta.Copy())
+	for k, v := range meta {
+		md.Set(k, strings.Join(v, ","))
+	}
+	return md
 }
 
 // Read the undecoded response
 func (r *response) Read() ([]byte, error) {
-	f := &codec.Frame{}
+	return nil, nil
-	wrap := &wrapStream{r.stream}
-
-	_, err := wrap.Read(f.Data)
-	if err != nil {
-		return nil, err
-	}
-
-	return f.Data, nil
 }

stream.go

@@ -5,8 +5,8 @@ import (
 	"io"
 	"sync"
 
-	"go.unistack.org/micro/v4/client"
+	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v4/tracer"
+	"go.unistack.org/micro/v3/tracer"
 	"google.golang.org/grpc"
 )
 
@@ -19,8 +19,8 @@ type grpcStream struct {
 	response client.Response
 	close    func(err error)
 	conn     *PoolConn
-	mu       sync.RWMutex
+	sync.RWMutex
-	closed   bool
+	closed bool
 }
 
 func (g *grpcStream) Context() context.Context {
@@ -88,15 +88,15 @@ func (g *grpcStream) RecvMsg(msg interface{}) (err error) {
 }
 
 func (g *grpcStream) Error() error {
-	g.mu.RLock()
+	g.RLock()
-	defer g.mu.RUnlock()
+	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
@@ -105,8 +105,8 @@ 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()
+	g.Lock()
-	defer g.mu.Unlock()
+	defer g.Unlock()
 
 	if g.closed {
 		return nil
@@ -125,8 +125,8 @@ func (g *grpcStream) Close() error {
 }
 
 func (g *grpcStream) CloseSend() error {
-	g.mu.Lock()
+	g.Lock()
-	defer g.mu.Unlock()
+	defer g.Unlock()
 
 	if g.closed {
 		return nil