config: add helper funcs

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

.github/dependabot.yml

@@ -0,0 +1,26 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    commit-message:
+      prefix: "chore"
+      include: "scope"
+
+  # Maintain dependencies for Golang
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    commit-message:
+      prefix: "chore"
+      include: "scope"
+

.github/generate.sh

@@ -1,15 +0,0 @@
-#!/bin/bash -e
-
-find . -type f -name '*.pb.*.go' -o -name '*.pb.go' -a ! -name 'message.pb.go' -delete
-PROTOS=$(find . -type f -name '*.proto' | grep -v proto/google/api)
-
-mkdir -p proto/google/api
-curl -s -o proto/google/api/annotations.proto -L https://raw.githubusercontent.com/googleapis/googleapis/master/google/api/annotations.proto
-curl -s -o proto/google/api/http.proto -L https://raw.githubusercontent.com/googleapis/googleapis/master/google/api/http.proto
-
-for PROTO in $PROTOS; do
-  echo $PROTO
-  protoc -I./proto -I. -I$(dirname $PROTO) --go-grpc_out=paths=source_relative:. --go_out=paths=source_relative:. --micro_out=paths=source_relative:. $PROTO
-done
-
-rm -r proto

.github/stale.sh

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-#go get github.com/psampaz/go-mod-outdated@v0.6.0
-go list -u -m -mod=mod -json all | go-mod-outdated -update -direct -ci || true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-#go list -u -m -json all | go-mod-outdated -update

.github/workflows/build.yml

@@ -9,9 +9,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: setup
-      uses: actions/setup-go@v1
+      uses: actions/setup-go@v2
       with:
-        go-version: 1.15
+        go-version: 1.16
     - name: cache
       uses: actions/cache@v2
       with:
@@ -49,11 +49,11 @@ jobs:
       - name: checkout
         uses: actions/checkout@v2
       - name: lint
-        uses: golangci/golangci-lint-action@v1
+        uses: golangci/golangci-lint-action@v2
         continue-on-error: true
         with:
           # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.
-          version: v1.30
+          version: v1.39
           # Optional: working directory, useful for monorepos
           # working-directory: somedir
           # Optional: golangci-lint command line arguments.

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,75 @@
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL"
+
+on:
+  workflow_run:
+    workflows: ["prbuild"]
+    types:
+      - completed
+  push:
+    branches: [ master ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ master ]
+  schedule:
+    - cron: '34 1 * * 0'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'go' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
+        # Learn more:
+        # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v1
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 https://git.io/JvXDl
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1

.github/workflows/dependabot-automerge.yml

@@ -0,0 +1,66 @@
+name: "prautomerge"
+
+on:
+  workflow_run:
+    workflows: ["prbuild"]
+    types:
+      - completed
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  Dependabot-Automerge:
+    runs-on: ubuntu-latest
+    # Contains workaround to execute if dependabot updates the PR by checking for the base branch in the linked PR
+    # The the github.event.workflow_run.event value is 'push' and not 'pull_request'
+    # dont work with multiple workflows when last returns success
+    if: >-
+      github.event.workflow_run.conclusion == 'success'
+      && github.actor == 'dependabot[bot]'
+      && github.event.sender.login == 'dependabot[bot]'
+      && github.event.sender.type == 'Bot'
+      && (github.event.workflow_run.event == 'pull_request'
+          || (github.event.workflow_run.event == 'push' && github.event.workflow_run.pull_requests[0].base.ref == github.event.repository.default_branch ))
+    steps:
+      - name: Approve Changes and Merge changes if label 'dependencies' is set
+        uses: actions/github-script@v5
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            console.log(context.payload.workflow_run);
+            
+            var labelNames = await github.paginate(
+              github.issues.listLabelsOnIssue,
+              {
+                repo: context.repo.repo,
+                owner: context.repo.owner,
+                issue_number: context.payload.workflow_run.pull_requests[0].number,
+              },
+              (response) => response.data.map(
+                (label) => label.name
+              )
+            );
+
+            console.log(labelNames);
+
+            if (labelNames.includes('dependencies')) {
+              console.log('Found label');
+
+              await github.pulls.createReview({
+                repo: context.repo.repo,
+                owner: context.repo.owner,
+                pull_number: context.payload.workflow_run.pull_requests[0].number,
+                event: 'APPROVE'
+              });
+              console.log('Approved PR');
+
+              await github.pulls.merge({
+                repo: context.repo.repo,
+                owner: context.repo.owner,
+                pull_number: context.payload.workflow_run.pull_requests[0].number,
+              });
+
+              console.log('Merged PR');
+            }

.github/workflows/pr.yml

@@ -9,13 +9,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: setup
-      uses: actions/setup-go@v1
+      uses: actions/setup-go@v2
       with:
-        go-version: 1.15
+        go-version: 1.16
     - name: cache
       uses: actions/cache@v2
       with:
-        path: ~/go/pkg/mod
+        path: ~/go/pkg
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
         restore-keys: ${{ runner.os }}-go-
     - name: sdk checkout
@@ -49,11 +49,11 @@ jobs:
       - name: checkout
         uses: actions/checkout@v2
       - name: lint
-        uses: golangci/golangci-lint-action@v1
+        uses: golangci/golangci-lint-action@v2
         continue-on-error: true
         with:
           # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.
-          version: v1.30
+          version: v1.39
           # Optional: working directory, useful for monorepos
           # working-directory: somedir
           # Optional: golangci-lint command line arguments.

.golangci.yml

@@ -1,40 +1,44 @@
 run:
+  concurrency: 4
   deadline: 5m
-  modules-download-mode: readonly
-  skip-dirs:
-    - util/mdns.new
-  skip-files:
-    - ".*\\.pb\\.go$"
-    - ".*\\.pb\\.micro\\.go$"
+  issues-exit-code: 1
+  tests: true
+
+linters-settings:
+  govet:
+    check-shadowing: true
+    enable:
+      - fieldalignment
+
 linters:
-  disable-all: false
-  enable-all: false
   enable:
-    - megacheck
-    - staticcheck
-    - deadcode
-    - varcheck
-    - gosimple
-    - unused
-    - prealloc
-    - scopelint
-    - gocritic
-    - goimports
-    - unconvert
     - govet
-    - nakedret
+    - deadcode
+    - errcheck
+    - govet
+    - ineffassign
+    - staticcheck
     - structcheck
-    - gosec
-  disable:
-    - maligned
-    - interfacer
     - typecheck
-    - dupl
-output:
-  format: colored-line-number
-  # print lines of code with issue, default is true
-  print-issued-lines: true
-  # print linter name in the end of issue text, default is true
-  print-linter-name: true
-  # make issues output unique by line, default is true
-  uniq-by-line: true
+    - unused
+    - varcheck
+    - bodyclose
+    - gci
+    - goconst
+    - gocritic
+    - gosimple
+    - gofmt
+    - gofumpt
+    - goimports
+    - revive
+    - gosec
+    - makezero
+    - misspell
+    - nakedret
+    - nestif
+    - nilerr
+    - noctx
+    - prealloc
+    - unconvert
+    - unparam
+  disable-all: false

SECURITY.md

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

api/api.go

@@ -10,6 +10,7 @@ import (
 	"github.com/unistack-org/micro/v3/server"
 )
 
+// Api interface
 type Api interface {
 	// Initialise options
 	Init(...Option) error
@@ -23,28 +24,30 @@ type Api interface {
 	String() string
 }
 
+// Options holds the options
 type Options struct{}
 
+// Option func signature
 type Option func(*Options) error
 
 // Endpoint is a mapping between an RPC method and HTTP endpoint
 type Endpoint struct {
-	// RPC Method e.g. Greeter.Hello
+	// Name Greeter.Hello
 	Name string
-	// Description e.g what's this endpoint for
+	// Desciption for endpoint
 	Description string
-	// API Handler e.g rpc, proxy
+	// Handler e.g rpc, proxy
 	Handler string
-	// HTTP Host e.g example.com
-	Host []string
-	// HTTP Methods e.g GET, POST
-	Method []string
-	// HTTP Path e.g /greeter. Expect POSIX regex
-	Path []string
 	// Body destination
 	// "*" or "" - top level message value
 	// "string" - inner message value
 	Body string
+	// Host e.g example.com
+	Host []string
+	// Method e.g GET, POST
+	Method []string
+	// Path e.g /greeter. Expect POSIX regex
+	Path []string
 	// Stream flag
 	Stream bool
 }
@@ -53,28 +56,12 @@ type Endpoint struct {
 type Service struct {
 	// Name of service
 	Name string
-	// The endpoint for this service
+	// Endpoint for this service
 	Endpoint *Endpoint
-	// Versions of this service
+	// Services that provides service
 	Services []*register.Service
 }
 
-func strip(s string) string {
-	return strings.TrimSpace(s)
-}
-
-func slice(s string) []string {
-	var sl []string
-
-	for _, p := range strings.Split(s, ",") {
-		if str := strip(p); len(str) > 0 {
-			sl = append(sl, strip(p))
-		}
-	}
-
-	return sl
-}
-
 // Encode encodes an endpoint to endpoint metadata
 func Encode(e *Endpoint) map[string]string {
 	if e == nil {
@@ -98,6 +85,7 @@ func Encode(e *Endpoint) map[string]string {
 	set("method", strings.Join(e.Method, ","))
 	set("path", strings.Join(e.Path, ","))
 	set("host", strings.Join(e.Host, ","))
+	set("body", e.Body)
 
 	return ep
 }
@@ -118,6 +106,7 @@ func Decode(e metadata.Metadata) *Endpoint {
 	ephost, _ := e.Get("host")
 	ep.Host = []string{ephost}
 	ep.Handler, _ = e.Get("handler")
+	ep.Body, _ = e.Get("body")
 
 	return ep
 }

api/api_test.go

@@ -5,6 +5,7 @@ import (
 	"testing"
 )
 
+//nolint:gocyclo
 func TestEncoding(t *testing.T) {
 	testData := []*Endpoint{
 		nil,
@@ -148,5 +149,4 @@ func TestValidate(t *testing.T) {
 	if err := Validate(epPcreInvalid); err == nil {
 		t.Fatalf("invalid pcre %v", epPcreInvalid.Path[0])
 	}
-
 }

api/handler/api/api.go

@@ -1,121 +0,0 @@
-// Package api provides an http-rpc handler which provides the entire http request over rpc
-package api
-
-import (
-	"net/http"
-
-	goapi "github.com/unistack-org/micro/v3/api"
-	"github.com/unistack-org/micro/v3/api/handler"
-	api "github.com/unistack-org/micro/v3/api/proto"
-	"github.com/unistack-org/micro/v3/client"
-	"github.com/unistack-org/micro/v3/errors"
-	"github.com/unistack-org/micro/v3/util/ctx"
-	"github.com/unistack-org/micro/v3/util/router"
-)
-
-type apiHandler struct {
-	opts handler.Options
-	s    *goapi.Service
-}
-
-const (
-	Handler = "api"
-)
-
-// API handler is the default handler which takes api.Request and returns api.Response
-func (a *apiHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	bsize := handler.DefaultMaxRecvSize
-	if a.opts.MaxRecvSize > 0 {
-		bsize = a.opts.MaxRecvSize
-	}
-
-	r.Body = http.MaxBytesReader(w, r.Body, bsize)
-	request, err := requestToProto(r)
-	if err != nil {
-		er := errors.InternalServerError("go.micro.api", err.Error())
-		w.Header().Set("Content-Type", "application/json")
-		w.WriteHeader(500)
-		w.Write([]byte(er.Error()))
-		return
-	}
-
-	var service *goapi.Service
-
-	if a.s != nil {
-		// we were given the service
-		service = a.s
-	} else if a.opts.Router != nil {
-		// try get service from router
-		s, err := a.opts.Router.Route(r)
-		if err != nil {
-			er := errors.InternalServerError("go.micro.api", err.Error())
-			w.Header().Set("Content-Type", "application/json")
-			w.WriteHeader(500)
-			w.Write([]byte(er.Error()))
-			return
-		}
-		service = s
-	} else {
-		// we have no way of routing the request
-		er := errors.InternalServerError("go.micro.api", "no route found")
-		w.Header().Set("Content-Type", "application/json")
-		w.WriteHeader(500)
-		w.Write([]byte(er.Error()))
-		return
-	}
-
-	// create request and response
-	c := a.opts.Client
-	req := c.NewRequest(service.Name, service.Endpoint.Name, request)
-	rsp := &api.Response{}
-
-	// create the context from headers
-	cx := ctx.FromRequest(r)
-
-	if err := c.Call(cx, req, rsp, client.WithRouter(router.New(service.Services))); err != nil {
-		w.Header().Set("Content-Type", "application/json")
-		ce := errors.Parse(err.Error())
-		switch ce.Code {
-		case 0:
-			w.WriteHeader(500)
-		default:
-			w.WriteHeader(int(ce.Code))
-		}
-		w.Write([]byte(ce.Error()))
-		return
-	} else if rsp.StatusCode == 0 {
-		rsp.StatusCode = http.StatusOK
-	}
-
-	for _, header := range rsp.GetHeader() {
-		for _, val := range header.Values {
-			w.Header().Add(header.Key, val)
-		}
-	}
-
-	if len(w.Header().Get("Content-Type")) == 0 {
-		w.Header().Set("Content-Type", "application/json")
-	}
-
-	w.WriteHeader(int(rsp.StatusCode))
-	w.Write([]byte(rsp.Body))
-}
-
-func (a *apiHandler) String() string {
-	return "api"
-}
-
-func NewHandler(opts ...handler.Option) handler.Handler {
-	options := handler.NewOptions(opts...)
-	return &apiHandler{
-		opts: options,
-	}
-}
-
-func WithService(s *goapi.Service, opts ...handler.Option) handler.Handler {
-	options := handler.NewOptions(opts...)
-	return &apiHandler{
-		opts: options,
-		s:    s,
-	}
-}

api/handler/api/util.go

@@ -1,109 +0,0 @@
-package api
-
-import (
-	"fmt"
-	"mime"
-	"net"
-	"net/http"
-	"strings"
-
-	"github.com/oxtoacart/bpool"
-	api "github.com/unistack-org/micro/v3/api/proto"
-)
-
-var (
-	// need to calculate later to specify useful defaults
-	bufferPool = bpool.NewSizedBufferPool(1024, 8)
-)
-
-func requestToProto(r *http.Request) (*api.Request, error) {
-	if err := r.ParseForm(); err != nil {
-		return nil, fmt.Errorf("Error parsing form: %v", err)
-	}
-
-	req := &api.Request{
-		Path:   r.URL.Path,
-		Method: r.Method,
-		Header: make(map[string]*api.Pair),
-		Get:    make(map[string]*api.Pair),
-		Post:   make(map[string]*api.Pair),
-		Url:    r.URL.String(),
-	}
-
-	ct, _, err := mime.ParseMediaType(r.Header.Get("Content-Type"))
-	if err != nil {
-		ct = "text/plain; charset=UTF-8" //default CT is text/plain
-		r.Header.Set("Content-Type", ct)
-	}
-
-	//set the body:
-	if r.Body != nil {
-		switch ct {
-		case "application/x-www-form-urlencoded":
-			// expect form vals in Post data
-		default:
-			buf := bufferPool.Get()
-			defer bufferPool.Put(buf)
-			if _, err = buf.ReadFrom(r.Body); err != nil {
-				return nil, err
-			}
-			req.Body = buf.String()
-		}
-	}
-
-	// Set X-Forwarded-For if it does not exist
-	if ip, _, err := net.SplitHostPort(r.RemoteAddr); err == nil {
-		if prior, ok := r.Header["X-Forwarded-For"]; ok {
-			ip = strings.Join(prior, ", ") + ", " + ip
-		}
-
-		// Set the header
-		req.Header["X-Forwarded-For"] = &api.Pair{
-			Key:    "X-Forwarded-For",
-			Values: []string{ip},
-		}
-	}
-
-	// Host is stripped from net/http Headers so let's add it
-	req.Header["Host"] = &api.Pair{
-		Key:    "Host",
-		Values: []string{r.Host},
-	}
-
-	// Get data
-	for key, vals := range r.URL.Query() {
-		header, ok := req.Get[key]
-		if !ok {
-			header = &api.Pair{
-				Key: key,
-			}
-			req.Get[key] = header
-		}
-		header.Values = vals
-	}
-
-	// Post data
-	for key, vals := range r.PostForm {
-		header, ok := req.Post[key]
-		if !ok {
-			header = &api.Pair{
-				Key: key,
-			}
-			req.Post[key] = header
-		}
-		header.Values = vals
-	}
-
-	for key, vals := range r.Header {
-		header, ok := req.Header[key]
-		if !ok {
-			header = &api.Pair{
-				Key: key,
-			}
-			req.Header[key] = header
-		}
-		header.Values = vals
-	}
-
-	return req, nil
-}

api/handler/api/util_test.go

@@ -1,46 +0,0 @@
-package api
-
-import (
-	"net/http"
-	"net/url"
-	"testing"
-)
-
-func TestRequestToProto(t *testing.T) {
-	testData := []*http.Request{
-		{
-			Method: "GET",
-			Header: http.Header{
-				"Header": []string{"test"},
-			},
-			URL: &url.URL{
-				Scheme:   "http",
-				Host:     "localhost",
-				Path:     "/foo/bar",
-				RawQuery: "param1=value1",
-			},
-		},
-	}
-
-	for _, d := range testData {
-		p, err := requestToProto(d)
-		if err != nil {
-			t.Fatal(err)
-		}
-		if p.Path != d.URL.Path {
-			t.Fatalf("Expected path %s got %s", d.URL.Path, p.Path)
-		}
-		if p.Method != d.Method {
-			t.Fatalf("Expected method %s got %s", d.Method, p.Method)
-		}
-		for k, v := range d.Header {
-			if val, ok := p.Header[k]; !ok {
-				t.Fatalf("Expected header %s", k)
-			} else {
-				if val.Values[0] != v[0] {
-					t.Fatalf("Expected val %s, got %s", val.Values[0], v[0])
-				}
-			}
-		}
-	}
-}

api/handler/event/event.go

@@ -1,141 +0,0 @@
-// Package event provides a handler which publishes an event
-package event
-
-import (
-	"encoding/json"
-	"fmt"
-	"net/http"
-	"path"
-	"regexp"
-	"strings"
-	"time"
-
-	"github.com/google/uuid"
-	"github.com/oxtoacart/bpool"
-	"github.com/unistack-org/micro/v3/api/handler"
-	proto "github.com/unistack-org/micro/v3/api/proto"
-	"github.com/unistack-org/micro/v3/util/ctx"
-)
-
-var (
-	bufferPool = bpool.NewSizedBufferPool(1024, 8)
-)
-
-type event struct {
-	opts handler.Options
-}
-
-var (
-	Handler   = "event"
-	versionRe = regexp.MustCompilePOSIX("^v[0-9]+$")
-)
-
-func eventName(parts []string) string {
-	return strings.Join(parts, ".")
-}
-
-func evRoute(ns, p string) (string, string) {
-	p = path.Clean(p)
-	p = strings.TrimPrefix(p, "/")
-
-	if len(p) == 0 {
-		return ns, "event"
-	}
-
-	parts := strings.Split(p, "/")
-
-	// no path
-	if len(parts) == 0 {
-		// topic: namespace
-		// action: event
-		return strings.Trim(ns, "."), "event"
-	}
-
-	// Treat /v[0-9]+ as versioning
-	// /v1/foo/bar => topic: v1.foo action: bar
-	if len(parts) >= 2 && versionRe.Match([]byte(parts[0])) {
-		topic := ns + "." + strings.Join(parts[:2], ".")
-		action := eventName(parts[1:])
-		return topic, action
-	}
-
-	// /foo => topic: ns.foo action: foo
-	// /foo/bar => topic: ns.foo action: bar
-	topic := ns + "." + strings.Join(parts[:1], ".")
-	action := eventName(parts[1:])
-
-	return topic, action
-}
-
-func (e *event) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	bsize := handler.DefaultMaxRecvSize
-	if e.opts.MaxRecvSize > 0 {
-		bsize = e.opts.MaxRecvSize
-	}
-
-	r.Body = http.MaxBytesReader(w, r.Body, bsize)
-
-	// request to topic:event
-	// create event
-	// publish to topic
-
-	topic, action := evRoute(e.opts.Namespace, r.URL.Path)
-
-	// create event
-	ev := &proto.Event{
-		Name: action,
-		// TODO: dedupe event
-		Id:        fmt.Sprintf("%s-%s-%s", topic, action, uuid.New().String()),
-		Header:    make(map[string]*proto.Pair),
-		Timestamp: time.Now().Unix(),
-	}
-
-	// set headers
-	for key, vals := range r.Header {
-		header, ok := ev.Header[key]
-		if !ok {
-			header = &proto.Pair{
-				Key: key,
-			}
-			ev.Header[key] = header
-		}
-		header.Values = vals
-	}
-
-	// set body
-	if r.Method == "GET" {
-		bytes, _ := json.Marshal(r.URL.Query())
-		ev.Data = string(bytes)
-	} else {
-		// Read body
-		buf := bufferPool.Get()
-		defer bufferPool.Put(buf)
-		if _, err := buf.ReadFrom(r.Body); err != nil {
-			http.Error(w, err.Error(), 500)
-			return
-		}
-		ev.Data = buf.String()
-	}
-
-	// get client
-	c := e.opts.Client
-
-	// create publication
-	p := c.NewMessage(topic, ev)
-
-	// publish event
-	if err := c.Publish(ctx.FromRequest(r), p); err != nil {
-		http.Error(w, err.Error(), 500)
-		return
-	}
-}
-
-func (e *event) String() string {
-	return "event"
-}
-
-func NewHandler(opts ...handler.Option) handler.Handler {
-	return &event{
-		opts: handler.NewOptions(opts...),
-	}
-}

api/handler/http/http.go

@@ -1,105 +0,0 @@
-// Package http is a http reverse proxy handler
-package http
-
-import (
-	"errors"
-	"fmt"
-	"math/rand"
-	"net/http"
-	"net/http/httputil"
-	"net/url"
-
-	"github.com/unistack-org/micro/v3/api"
-	"github.com/unistack-org/micro/v3/api/handler"
-	"github.com/unistack-org/micro/v3/register"
-)
-
-const (
-	Handler = "http"
-)
-
-type httpHandler struct {
-	options handler.Options
-
-	// set with different initializer
-	s *api.Service
-}
-
-func (h *httpHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	service, err := h.getService(r)
-	if err != nil {
-		w.WriteHeader(500)
-		return
-	}
-
-	if len(service) == 0 {
-		w.WriteHeader(404)
-		return
-	}
-
-	rp, err := url.Parse(service)
-	if err != nil {
-		w.WriteHeader(500)
-		return
-	}
-
-	httputil.NewSingleHostReverseProxy(rp).ServeHTTP(w, r)
-}
-
-// getService returns the service for this request from the selector
-func (h *httpHandler) getService(r *http.Request) (string, error) {
-	var service *api.Service
-
-	if h.s != nil {
-		// we were given the service
-		service = h.s
-	} else if h.options.Router != nil {
-		// try get service from router
-		s, err := h.options.Router.Route(r)
-		if err != nil {
-			return "", err
-		}
-		service = s
-	} else {
-		// we have no way of routing the request
-		return "", errors.New("no route found")
-	}
-
-	if len(service.Services) == 0 {
-		return "", errors.New("no route found")
-	}
-
-	// get the nodes for this service
-	nodes := make([]*register.Node, 0, len(service.Services))
-	for _, srv := range service.Services {
-		nodes = append(nodes, srv.Nodes...)
-	}
-
-	// select a random node
-	node := nodes[rand.Int()%len(nodes)]
-
-	return fmt.Sprintf("http://%s", node.Address), nil
-}
-
-func (h *httpHandler) String() string {
-	return "http"
-}
-
-// NewHandler returns a http proxy handler
-func NewHandler(opts ...handler.Option) handler.Handler {
-	options := handler.NewOptions(opts...)
-
-	return &httpHandler{
-		options: options,
-	}
-}
-
-// WithService creates a handler with a service
-func WithService(s *api.Service, opts ...handler.Option) handler.Handler {
-	options := handler.NewOptions(opts...)
-
-	return &httpHandler{
-		options: options,
-		s:       s,
-	}
-}

api/handler/http/http_test.go

@@ -1,129 +0,0 @@
-// +build ignore
-
-package http
-
-import (
-	"net"
-	"net/http"
-	"net/http/httptest"
-	"testing"
-
-	"github.com/unistack-org/micro/v3/api/handler"
-	"github.com/unistack-org/micro/v3/api/resolver"
-	"github.com/unistack-org/micro/v3/api/resolver/vpath"
-	"github.com/unistack-org/micro/v3/api/router"
-	regRouter "github.com/unistack-org/micro/v3/api/router/register"
-	"github.com/unistack-org/micro/v3/register"
-	"github.com/unistack-org/micro/v3/register/memory"
-)
-
-func testHttp(t *testing.T, path, service, ns string) {
-	r := memory.NewRegister()
-
-	l, err := net.Listen("tcp", "127.0.0.1:0")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer l.Close()
-
-	s := &register.Service{
-		Name: service,
-		Nodes: []*register.Node{
-			{
-				Id:      service + "-1",
-				Address: l.Addr().String(),
-			},
-		},
-	}
-
-	r.Register(s)
-	defer r.Deregister(s)
-
-	// setup the test handler
-	m := http.NewServeMux()
-	m.HandleFunc(path, func(w http.ResponseWriter, r *http.Request) {
-		w.Write([]byte(`you got served`))
-	})
-
-	// start http test serve
-	go http.Serve(l, m)
-
-	// create new request and writer
-	w := httptest.NewRecorder()
-	req, err := http.NewRequest("POST", path, nil)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	// initialise the handler
-	rt := regRouter.NewRouter(
-		router.WithHandler("http"),
-		router.WithRegister(r),
-		router.WithResolver(vpath.NewResolver(
-			resolver.WithServicePrefix(ns),
-		)),
-	)
-
-	p := NewHandler(handler.WithRouter(rt))
-
-	// execute the handler
-	p.ServeHTTP(w, req)
-
-	if w.Code != 200 {
-		t.Fatalf("Expected 200 response got %d %s", w.Code, w.Body.String())
-	}
-
-	if w.Body.String() != "you got served" {
-		t.Fatalf("Expected body: you got served. Got: %s", w.Body.String())
-	}
-}
-
-func TestHttpHandler(t *testing.T) {
-	testData := []struct {
-		path      string
-		service   string
-		namespace string
-	}{
-		{
-			"/test/foo",
-			"go.micro.api.test",
-			"go.micro.api",
-		},
-		{
-			"/test/foo/baz",
-			"go.micro.api.test",
-			"go.micro.api",
-		},
-		{
-			"/v1/foo",
-			"go.micro.api.v1.foo",
-			"go.micro.api",
-		},
-		{
-			"/v1/foo/bar",
-			"go.micro.api.v1.foo",
-			"go.micro.api",
-		},
-		{
-			"/v2/baz",
-			"go.micro.api.v2.baz",
-			"go.micro.api",
-		},
-		{
-			"/v2/baz/bar",
-			"go.micro.api.v2.baz",
-			"go.micro.api",
-		},
-		{
-			"/v2/baz/bar",
-			"v2.baz",
-			"",
-		},
-	}
-
-	for _, d := range testData {
-		t.Run(d.service, func(t *testing.T) {
-			testHttp(t, d.path, d.service, d.namespace)
-		})
-	}
-}

api/handler/options.go

@@ -3,24 +3,32 @@ package handler
 import (
 	"github.com/unistack-org/micro/v3/api/router"
 	"github.com/unistack-org/micro/v3/client"
+	"github.com/unistack-org/micro/v3/logger"
 )
 
-var (
-	DefaultMaxRecvSize int64 = 1024 * 1024 * 100 // 10Mb
-)
+// DefaultMaxRecvSize specifies max recv size for handler
+var DefaultMaxRecvSize int64 = 1024 * 1024 * 100 // 10Mb
 
+// Options struct holds handler options
 type Options struct {
-	MaxRecvSize int64
-	Namespace   string
 	Router      router.Router
 	Client      client.Client
+	Logger      logger.Logger
+	Namespace   string
+	MaxRecvSize int64
 }
 
+// Option func signature
 type Option func(o *Options)
 
-// NewOptions fills in the blanks
+// NewOptions creates new options struct and fills it
 func NewOptions(opts ...Option) Options {
-	var options Options
+	options := Options{
+		Client:      client.DefaultClient,
+		Router:      router.DefaultRouter,
+		Logger:      logger.DefaultLogger,
+		MaxRecvSize: DefaultMaxRecvSize,
+	}
 	for _, o := range opts {
 		o(&options)
 	}
@@ -30,10 +38,6 @@ func NewOptions(opts ...Option) Options {
 		WithNamespace("go.micro.api")(&options)
 	}
 
-	if options.MaxRecvSize == 0 {
-		options.MaxRecvSize = DefaultMaxRecvSize
-	}
-
 	return options
 }
 
@@ -51,6 +55,7 @@ func WithRouter(r router.Router) Option {
 	}
 }
 
+// WithClient specifies client to be used by the handler
 func WithClient(c client.Client) Option {
 	return func(o *Options) {
 		o.Client = c

api/handler/web/web.go

@@ -1,182 +0,0 @@
-// Package web contains the web handler including websocket support
-package web
-
-import (
-	"errors"
-	"fmt"
-	"io"
-	"math/rand"
-	"net"
-	"net/http"
-	"net/http/httputil"
-	"net/url"
-	"strings"
-
-	"github.com/unistack-org/micro/v3/api"
-	"github.com/unistack-org/micro/v3/api/handler"
-	"github.com/unistack-org/micro/v3/register"
-)
-
-const (
-	Handler = "web"
-)
-
-type webHandler struct {
-	opts handler.Options
-	s    *api.Service
-}
-
-func (wh *webHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	service, err := wh.getService(r)
-	if err != nil {
-		w.WriteHeader(500)
-		return
-	}
-
-	if len(service) == 0 {
-		w.WriteHeader(404)
-		return
-	}
-
-	rp, err := url.Parse(service)
-	if err != nil {
-		w.WriteHeader(500)
-		return
-	}
-
-	if isWebSocket(r) {
-		wh.serveWebSocket(rp.Host, w, r)
-		return
-	}
-
-	httputil.NewSingleHostReverseProxy(rp).ServeHTTP(w, r)
-}
-
-// getService returns the service for this request from the selector
-func (wh *webHandler) getService(r *http.Request) (string, error) {
-	var service *api.Service
-
-	if wh.s != nil {
-		// we were given the service
-		service = wh.s
-	} else if wh.opts.Router != nil {
-		// try get service from router
-		s, err := wh.opts.Router.Route(r)
-		if err != nil {
-			return "", err
-		}
-		service = s
-	} else {
-		// we have no way of routing the request
-		return "", errors.New("no route found")
-	}
-
-	// get the nodes
-	nodes := make([]*register.Node, 0, len(service.Services))
-	for _, srv := range service.Services {
-		nodes = append(nodes, srv.Nodes...)
-	}
-
-	if len(nodes) == 0 {
-		return "", errors.New("no route found")
-	}
-
-	// select a random node
-	node := nodes[rand.Int()%len(nodes)]
-
-	return fmt.Sprintf("http://%s", node.Address), nil
-}
-
-// serveWebSocket used to serve a web socket proxied connection
-func (wh *webHandler) serveWebSocket(host string, w http.ResponseWriter, r *http.Request) {
-	req := new(http.Request)
-	*req = *r
-
-	if len(host) == 0 {
-		http.Error(w, "invalid host", 500)
-		return
-	}
-
-	// set x-forward-for
-	if clientIP, _, err := net.SplitHostPort(r.RemoteAddr); err == nil {
-		if ips, ok := req.Header["X-Forwarded-For"]; ok {
-			clientIP = strings.Join(ips, ", ") + ", " + clientIP
-		}
-		req.Header.Set("X-Forwarded-For", clientIP)
-	}
-
-	// connect to the backend host
-	conn, err := net.Dial("tcp", host)
-	if err != nil {
-		http.Error(w, err.Error(), 500)
-		return
-	}
-
-	// hijack the connection
-	hj, ok := w.(http.Hijacker)
-	if !ok {
-		http.Error(w, "failed to connect", 500)
-		return
-	}
-
-	nc, _, err := hj.Hijack()
-	if err != nil {
-		return
-	}
-
-	defer nc.Close()
-	defer conn.Close()
-
-	if err = req.Write(conn); err != nil {
-		return
-	}
-
-	errCh := make(chan error, 2)
-
-	cp := func(dst io.Writer, src io.Reader) {
-		_, err := io.Copy(dst, src)
-		errCh <- err
-	}
-
-	go cp(conn, nc)
-	go cp(nc, conn)
-
-	<-errCh
-}
-
-func isWebSocket(r *http.Request) bool {
-	contains := func(key, val string) bool {
-		vv := strings.Split(r.Header.Get(key), ",")
-		for _, v := range vv {
-			if val == strings.ToLower(strings.TrimSpace(v)) {
-				return true
-			}
-		}
-		return false
-	}
-
-	if contains("Connection", "upgrade") && contains("Upgrade", "websocket") {
-		return true
-	}
-
-	return false
-}
-
-func (wh *webHandler) String() string {
-	return "web"
-}
-
-func NewHandler(opts ...handler.Option) handler.Handler {
-	return &webHandler{
-		opts: handler.NewOptions(opts...),
-	}
-}
-
-func WithService(s *api.Service, opts ...handler.Option) handler.Handler {
-	options := handler.NewOptions(opts...)
-
-	return &webHandler{
-		opts: options,
-		s:    s,
-	}
-}

api/internal/proto/message.pb.go

@@ -1,28 +0,0 @@
-package proto
-
-type Message struct {
-	data []byte
-}
-
-func (m *Message) ProtoMessage() {}
-
-func (m *Message) Reset() {
-	*m = Message{}
-}
-
-func (m *Message) String() string {
-	return string(m.data)
-}
-
-func (m *Message) Marshal() ([]byte, error) {
-	return m.data, nil
-}
-
-func (m *Message) Unmarshal(data []byte) error {
-	m.data = data
-	return nil
-}
-
-func NewMessage(data []byte) *Message {
-	return &Message{data}
-}

api/proto/api.pb.go

@@ -1,511 +0,0 @@
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// versions:
-// 	protoc-gen-go v1.25.0
-// 	protoc        v3.6.1
-// source: api/proto/api.proto
-
-package go_api
-
-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 Pair struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Key    string   `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
-	Values []string `protobuf:"bytes,2,rep,name=values,proto3" json:"values,omitempty"`
-}
-
-func (x *Pair) Reset() {
-	*x = Pair{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_api_proto_api_proto_msgTypes[0]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *Pair) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*Pair) ProtoMessage() {}
-
-func (x *Pair) ProtoReflect() protoreflect.Message {
-	mi := &file_api_proto_api_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 Pair.ProtoReflect.Descriptor instead.
-func (*Pair) Descriptor() ([]byte, []int) {
-	return file_api_proto_api_proto_rawDescGZIP(), []int{0}
-}
-
-func (x *Pair) GetKey() string {
-	if x != nil {
-		return x.Key
-	}
-	return ""
-}
-
-func (x *Pair) GetValues() []string {
-	if x != nil {
-		return x.Values
-	}
-	return nil
-}
-
-// A HTTP request as RPC
-// Forward by the api handler
-type Request struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Method string           `protobuf:"bytes,1,opt,name=method,proto3" json:"method,omitempty"`
-	Path   string           `protobuf:"bytes,2,opt,name=path,proto3" json:"path,omitempty"`
-	Header map[string]*Pair `protobuf:"bytes,3,rep,name=header,proto3" json:"header,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	Get    map[string]*Pair `protobuf:"bytes,4,rep,name=get,proto3" json:"get,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	Post   map[string]*Pair `protobuf:"bytes,5,rep,name=post,proto3" json:"post,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	Body   string           `protobuf:"bytes,6,opt,name=body,proto3" json:"body,omitempty"` // raw request body; if not application/x-www-form-urlencoded
-	Url    string           `protobuf:"bytes,7,opt,name=url,proto3" json:"url,omitempty"`
-}
-
-func (x *Request) Reset() {
-	*x = Request{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_api_proto_api_proto_msgTypes[1]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *Request) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*Request) ProtoMessage() {}
-
-func (x *Request) ProtoReflect() protoreflect.Message {
-	mi := &file_api_proto_api_proto_msgTypes[1]
-	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 Request.ProtoReflect.Descriptor instead.
-func (*Request) Descriptor() ([]byte, []int) {
-	return file_api_proto_api_proto_rawDescGZIP(), []int{1}
-}
-
-func (x *Request) GetMethod() string {
-	if x != nil {
-		return x.Method
-	}
-	return ""
-}
-
-func (x *Request) GetPath() string {
-	if x != nil {
-		return x.Path
-	}
-	return ""
-}
-
-func (x *Request) GetHeader() map[string]*Pair {
-	if x != nil {
-		return x.Header
-	}
-	return nil
-}
-
-func (x *Request) GetGet() map[string]*Pair {
-	if x != nil {
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-}
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-}
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-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
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-	// event headers
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-		if ms.LoadMessageInfo() == nil {
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-		}
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-	}
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-}
-
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-	}
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-		return x.Data
-	}
-	return ""
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-
-var (
-	file_api_proto_api_proto_rawDescOnce sync.Once
-	file_api_proto_api_proto_rawDescData = file_api_proto_api_proto_rawDesc
-)
-
-func file_api_proto_api_proto_rawDescGZIP() []byte {
-	file_api_proto_api_proto_rawDescOnce.Do(func() {
-		file_api_proto_api_proto_rawDescData = protoimpl.X.CompressGZIP(file_api_proto_api_proto_rawDescData)
-	})
-	return file_api_proto_api_proto_rawDescData
-}
-
-var file_api_proto_api_proto_msgTypes = make([]protoimpl.MessageInfo, 9)
-var file_api_proto_api_proto_goTypes = []interface{}{
-	(*Pair)(nil),     // 0: go.api.Pair
-	(*Request)(nil),  // 1: go.api.Request
-	(*Response)(nil), // 2: go.api.Response
-	(*Event)(nil),    // 3: go.api.Event
-	nil,              // 4: go.api.Request.HeaderEntry
-	nil,              // 5: go.api.Request.GetEntry
-	nil,              // 6: go.api.Request.PostEntry
-	nil,              // 7: go.api.Response.HeaderEntry
-	nil,              // 8: go.api.Event.HeaderEntry
-}
-var file_api_proto_api_proto_depIdxs = []int32{
-	4,  // 0: go.api.Request.header:type_name -> go.api.Request.HeaderEntry
-	5,  // 1: go.api.Request.get:type_name -> go.api.Request.GetEntry
-	6,  // 2: go.api.Request.post:type_name -> go.api.Request.PostEntry
-	7,  // 3: go.api.Response.header:type_name -> go.api.Response.HeaderEntry
-	8,  // 4: go.api.Event.header:type_name -> go.api.Event.HeaderEntry
-	0,  // 5: go.api.Request.HeaderEntry.value:type_name -> go.api.Pair
-	0,  // 6: go.api.Request.GetEntry.value:type_name -> go.api.Pair
-	0,  // 7: go.api.Request.PostEntry.value:type_name -> go.api.Pair
-	0,  // 8: go.api.Response.HeaderEntry.value:type_name -> go.api.Pair
-	0,  // 9: go.api.Event.HeaderEntry.value:type_name -> go.api.Pair
-	10, // [10:10] is the sub-list for method output_type
-	10, // [10:10] is the sub-list for method input_type
-	10, // [10:10] is the sub-list for extension type_name
-	10, // [10:10] is the sub-list for extension extendee
-	0,  // [0:10] is the sub-list for field type_name
-}
-
-func init() { file_api_proto_api_proto_init() }
-func file_api_proto_api_proto_init() {
-	if File_api_proto_api_proto != nil {
-		return
-	}
-	if !protoimpl.UnsafeEnabled {
-		file_api_proto_api_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Pair); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_api_proto_api_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Request); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_api_proto_api_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
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-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_api_proto_api_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
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-			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_api_proto_api_proto_rawDesc,
-			NumEnums:      0,
-			NumMessages:   9,
-			NumExtensions: 0,
-			NumServices:   0,
-		},
-		GoTypes:           file_api_proto_api_proto_goTypes,
-		DependencyIndexes: file_api_proto_api_proto_depIdxs,
-		MessageInfos:      file_api_proto_api_proto_msgTypes,
-	}.Build()
-	File_api_proto_api_proto = out.File
-	file_api_proto_api_proto_rawDesc = nil
-	file_api_proto_api_proto_goTypes = nil
-	file_api_proto_api_proto_depIdxs = nil
-}

api/proto/api.pb.micro.go

@@ -1,21 +0,0 @@
-// Code generated by protoc-gen-micro. DO NOT EDIT.
-// source: api/proto/api.proto
-
-package go_api
-
-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

api/proto/api.proto

@@ -1,43 +0,0 @@
-syntax = "proto3";
-
-package go.api;
-
-message Pair {
-	string key = 1;
-	repeated string values = 2;
-}
-
-// A HTTP request as RPC
-// Forward by the api handler
-message Request {
-        string method = 1;
-        string path = 2;
-        map<string, Pair> header = 3;
-        map<string, Pair> get = 4;
-        map<string, Pair> post = 5;
-        string body = 6;  // raw request body; if not application/x-www-form-urlencoded
-	string url = 7;
-}
-
-// A HTTP response as RPC
-// Expected response for the api handler
-message Response {
-        int32 statusCode = 1;
-        map<string, Pair> header = 2;
-        string body = 3;
-}
-
-// A HTTP event as RPC
-// Forwarded by the event handler
-message Event {
-	// e.g login
-	string name = 1;
-	// uuid
-	string id = 2;
-	// unix timestamp of event
-	int64 timestamp = 3;
-	// event headers
-        map<string, Pair> header = 4;
-	// the event data
-	string data = 5;
-}

api/resolver/host/host.go

@@ -7,11 +7,12 @@ import (
 	"github.com/unistack-org/micro/v3/api/resolver"
 )
 
-type Resolver struct {
+type hostResolver struct {
 	opts resolver.Options
 }
 
-func (r *Resolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*resolver.Endpoint, error) {
+// Resolve endpoint
+func (r *hostResolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*resolver.Endpoint, error) {
 	// parse options
 	options := resolver.NewResolveOptions(opts...)
 
@@ -24,10 +25,11 @@ func (r *Resolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*
 	}, nil
 }
 
-func (r *Resolver) String() string {
+func (r *hostResolver) String() string {
 	return "host"
 }
 
+// NewResolver creates new host api resolver
 func NewResolver(opts ...resolver.Option) resolver.Resolver {
-	return &Resolver{opts: resolver.NewOptions(opts...)}
+	return &hostResolver{opts: resolver.NewOptions(opts...)}
 }

api/resolver/options.go

@@ -8,9 +8,12 @@ import (
 
 // Options struct
 type Options struct {
-	Handler       string
+	// Context is for external defined options
+	Context context.Context
+	// Handler name
+	Handler string
+	// ServicePrefix is the prefix
 	ServicePrefix string
-	Context       context.Context
 }
 
 // Option func

api/resolver/path/path.go

@@ -8,10 +8,12 @@ import (
 	"github.com/unistack-org/micro/v3/api/resolver"
 )
 
+// Resolver the path resolver
 type Resolver struct {
 	opts resolver.Options
 }
 
+// Resolve resolves endpoint
 func (r *Resolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*resolver.Endpoint, error) {
 	// parse options
 	options := resolver.NewResolveOptions(opts...)
@@ -31,10 +33,12 @@ func (r *Resolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*
 	}, nil
 }
 
+// String retruns the string representation
 func (r *Resolver) String() string {
 	return "path"
 }
 
+// NewResolver returns new path resolver
 func NewResolver(opts ...resolver.Option) resolver.Resolver {
 	return &Resolver{opts: resolver.NewOptions(opts...)}
 }

api/resolver/subdomain/subdomain.go

@@ -12,17 +12,19 @@ import (
 	"golang.org/x/net/publicsuffix"
 )
 
+// NewResolver creates new subdomain api resolver
 func NewResolver(parent resolver.Resolver, opts ...resolver.Option) resolver.Resolver {
 	options := resolver.NewOptions(opts...)
-	return &Resolver{options, parent}
+	return &subdomainResolver{opts: options, Resolver: parent}
 }
 
-type Resolver struct {
-	opts resolver.Options
+type subdomainResolver struct {
 	resolver.Resolver
+	opts resolver.Options
 }
 
-func (r *Resolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*resolver.Endpoint, error) {
+// Resolve resolve endpoint based on subdomain
+func (r *subdomainResolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*resolver.Endpoint, error) {
 	if dom := r.Domain(req); len(dom) > 0 {
 		opts = append(opts, resolver.Domain(dom))
 	}
@@ -30,7 +32,8 @@ func (r *Resolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*
 	return r.Resolver.Resolve(req, opts...)
 }
 
-func (r *Resolver) Domain(req *http.Request) string {
+// Domain returns domain
+func (r *subdomainResolver) Domain(req *http.Request) string {
 	// determine the host, e.g. foobar.m3o.app
 	host := req.URL.Hostname()
 	if len(host) == 0 {
@@ -82,6 +85,6 @@ func (r *Resolver) Domain(req *http.Request) string {
 	return strings.Join(comps, "-")
 }
 
-func (r *Resolver) String() string {
+func (r *subdomainResolver) String() string {
 	return "subdomain"
 }

api/resolver/subdomain/subdomain_test.go

@@ -6,8 +6,6 @@ import (
 	"testing"
 
 	"github.com/unistack-org/micro/v3/api/resolver/vpath"
-
-	"github.com/stretchr/testify/assert"
 )
 
 func TestResolve(t *testing.T) {
@@ -62,9 +60,13 @@ func TestResolve(t *testing.T) {
 		t.Run(tc.Name, func(t *testing.T) {
 			r := NewResolver(vpath.NewResolver())
 			result, err := r.Resolve(&http.Request{URL: &url.URL{Host: tc.Host, Path: "foo/bar"}})
-			assert.Nil(t, err, "Expecter err to be nil")
+			if err != nil {
+				t.Fatal(err)
+			}
 			if result != nil {
-				assert.Equal(t, tc.Result, result.Domain, "Expected %v but got %v", tc.Result, result.Domain)
+				if tc.Result != result.Domain {
+					t.Fatalf("Expected %v but got %v", tc.Result, result.Domain)
+				}
 			}
 		})
 	}

api/resolver/vpath/vpath.go

@@ -10,19 +10,19 @@ import (
 	"github.com/unistack-org/micro/v3/api/resolver"
 )
 
+// NewResolver creates new vpath api resolver
 func NewResolver(opts ...resolver.Option) resolver.Resolver {
-	return &Resolver{opts: resolver.NewOptions(opts...)}
+	return &vpathResolver{opts: resolver.NewOptions(opts...)}
 }
 
-type Resolver struct {
+type vpathResolver struct {
 	opts resolver.Options
 }
 
-var (
-	re = regexp.MustCompile("^v[0-9]+$")
-)
+var re = regexp.MustCompile("^v[0-9]+$")
 
-func (r *Resolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*resolver.Endpoint, error) {
+// Resolve endpoint
+func (r *vpathResolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*resolver.Endpoint, error) {
 	if req.URL.Path == "/" {
 		return nil, errors.New("unknown name")
 	}
@@ -60,12 +60,12 @@ func (r *Resolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*
 	}, nil
 }
 
-func (r *Resolver) String() string {
-	return "path"
+func (r *vpathResolver) String() string {
+	return "vpath"
 }
 
 // withPrefix transforms "foo" into "go.micro.api.foo"
-func (r *Resolver) withPrefix(parts ...string) string {
+func (r *vpathResolver) withPrefix(parts ...string) string {
 	p := r.opts.ServicePrefix
 	if len(p) > 0 {
 		parts = append([]string{p}, parts...)

api/router/options.go

@@ -9,16 +9,24 @@ import (
 	"github.com/unistack-org/micro/v3/register"
 )
 
+// Options holds the options for api router
 type Options struct {
-	Handler  string
+	// Register for service lookup
 	Register register.Register
+	// Resolver to use
 	Resolver resolver.Resolver
-	Logger   logger.Logger
-	Context  context.Context
+	// Logger micro logger
+	Logger logger.Logger
+	// Context is for external options
+	Context context.Context
+	// Handler name
+	Handler string
 }
 
+// Option func signature
 type Option func(o *Options)
 
+// NewOptions returns options struct filled by opts
 func NewOptions(opts ...Option) Options {
 	options := Options{
 		Context: context.Background(),

api/router/router.go

@@ -7,6 +7,9 @@ import (
 	"github.com/unistack-org/micro/v3/api"
 )
 
+// DefaultRouter contains default router implementation
+var DefaultRouter Router
+
 // Router is used to determine an endpoint for a request
 type Router interface {
 	// Returns options
@@ -23,6 +26,6 @@ type Router interface {
 	Deregister(ep *api.Endpoint) error
 	// Route returns an api.Service route
 	Route(r *http.Request) (*api.Service, error)
-	// String represenation of router
+	// String representation of router
 	String() string
 }

auth/auth.go

@@ -19,6 +19,7 @@ const (
 )
 
 var (
+	// DefaultAuth holds default auth implementation
 	DefaultAuth Auth = NewAuth()
 	// ErrInvalidToken is when the token provided is not valid
 	ErrInvalidToken = errors.New("invalid token provided")
@@ -29,7 +30,7 @@ var (
 // Auth provides authentication and authorization
 type Auth interface {
 	// Init the auth
-	Init(opts ...Option)
+	Init(opts ...Option) error
 	// Options set for auth
 	Options() Options
 	// Generate a new account
@@ -52,30 +53,30 @@ type Auth interface {
 
 // Account provided by an auth provider
 type Account struct {
-	// ID of the account e.g. email
+	// Metadata any other associated metadata
+	Metadata metadata.Metadata `json:"metadata"`
+	// ID of the account e.g. email or id
 	ID string `json:"id"`
 	// Type of the account, e.g. service
 	Type string `json:"type"`
 	// Issuer of the account
 	Issuer string `json:"issuer"`
-	// Any other associated metadata
-	Metadata metadata.Metadata `json:"metadata"`
-	// Scopes the account has access to
-	Scopes []string `json:"scopes"`
 	// Secret for the account, e.g. the password
 	Secret string `json:"secret"`
+	// Scopes the account has access to
+	Scopes []string `json:"scopes"`
 }
 
 // Token can be short or long lived
 type Token struct {
-	// The token to be used for accessing resources
-	AccessToken string `json:"access_token"`
-	// RefreshToken to be used to generate a new token
-	RefreshToken string `json:"refresh_token"`
 	// Time of token creation
 	Created time.Time `json:"created"`
 	// Time of token expiry
 	Expiry time.Time `json:"expiry"`
+	// The token to be used for accessing resources
+	AccessToken string `json:"access_token"`
+	// RefreshToken to be used to generate a new token
+	RefreshToken string `json:"refresh_token"`
 }
 
 // Expired returns a boolean indicating if the token needs to be refreshed
@@ -105,17 +106,15 @@ const (
 
 // Rule is used to verify access to a resource
 type Rule struct {
-	// ID of the rule, e.g. "public"
-	ID string
-	// Scope the rule requires, a blank scope indicates open to the public and * indicates the rule
-	// applies to any valid account
-	Scope string
-	// Resource the rule applies to
+	// Resource that rule belongs to
 	Resource *Resource
-	// Access determines if the rule grants or denies access to the resource
+	// ID of the rule
+	ID string
+	// Scope of the rule
+	Scope string
+	// Access flag allow/deny
 	Access Access
-	// Priority the rule should take when verifying a request, the higher the value the sooner the
-	// rule will be applied
+	// Priority holds the rule priority
 	Priority int32
 }
 

auth/noop.go

@@ -1,7 +1,7 @@
 package auth
 
 import (
-	"github.com/google/uuid"
+	"github.com/unistack-org/micro/v3/util/id"
 )
 
 type noopAuth struct {
@@ -14,10 +14,11 @@ func (n *noopAuth) String() string {
 }
 
 // Init the auth
-func (n *noopAuth) Init(opts ...Option) {
+func (n *noopAuth) Init(opts ...Option) error {
 	for _, o := range opts {
 		o(&n.opts)
 	}
+	return nil
 }
 
 // Options set for auth
@@ -60,11 +61,11 @@ func (n *noopAuth) Verify(acc *Account, res *Resource, opts ...VerifyOption) err
 
 // Inspect a token
 func (n *noopAuth) Inspect(token string) (*Account, error) {
-	uid, err := uuid.NewRandom()
+	id, err := id.New()
 	if err != nil {
 		return nil, err
 	}
-	return &Account{ID: uid.String(), Issuer: n.Options().Issuer}, nil
+	return &Account{ID: id, Issuer: n.Options().Issuer}, nil
 }
 
 // Token generation using an account id and secret

auth/options.go

@@ -24,34 +24,36 @@ func NewOptions(opts ...Option) Options {
 	return options
 }
 
+// Options struct holds auth options
 type Options struct {
-	Name string
-	// Issuer of the service's account
-	Issuer string
-	// ID is the services auth ID
-	ID string
-	// Secret is used to authenticate the service
-	Secret string
+	// Context holds the external options
+	Context context.Context
+	// Meter used for metrics
+	Meter meter.Meter
+	// Logger used for logging
+	Logger logger.Logger
+	// Tracer used for tracing
+	Tracer tracer.Tracer
+	// Store used for stre data
+	Store store.Store
 	// Token is the services token used to authenticate itself
 	Token *Token
-	// PublicKey for decoding JWTs
-	PublicKey string
-	// PrivateKey for encoding JWTs
-	PrivateKey string
 	// LoginURL is the relative url path where a user can login
 	LoginURL string
-	// Store to back auth
-	Store store.Store
+	// PrivateKey for encoding JWTs
+	PrivateKey string
+	// PublicKey for decoding JWTs
+	PublicKey string
+	// Secret is used to authenticate the service
+	Secret string
+	// ID is the services auth ID
+	ID string
+	// Issuer of the service's account
+	Issuer string
+	// Name holds the auth name
+	Name string
 	// Addrs sets the addresses of auth
 	Addrs []string
-	// Logger sets the logger
-	Logger logger.Logger
-	// Meter sets tht meter
-	Meter meter.Meter
-	// Tracer
-	Tracer tracer.Tracer
-	// Context to store other options
-	Context context.Context
 }
 
 // Option func
@@ -123,18 +125,12 @@ func LoginURL(url string) Option {
 
 // GenerateOptions struct
 type GenerateOptions struct {
-	// Metadata associated with the account
 	Metadata metadata.Metadata
-	// Scopes the account has access too
-	Scopes []string
-	// Provider of the account, e.g. oauth
 	Provider string
-	// Type of the account, e.g. user
-	Type string
-	// Secret used to authenticate the account
-	Secret string
-	// Issuer of the account, e.g. micro
-	Issuer string
+	Type     string
+	Secret   string
+	Issuer   string
+	Scopes   []string
 }
 
 // GenerateOption func
@@ -193,16 +189,11 @@ func NewGenerateOptions(opts ...GenerateOption) GenerateOptions {
 
 // TokenOptions struct
 type TokenOptions struct {
-	// ID for the account
-	ID string
-	// Secret for the account
-	Secret string
-	// RefreshToken is used to refesh a token
+	ID           string
+	Secret       string
 	RefreshToken string
-	// Expiry is the time the token should live for
-	Expiry time.Duration
-	// Issuer of the account
-	Issuer string
+	Issuer       string
+	Expiry       time.Duration
 }
 
 // TokenOption func

auth/rules.go

@@ -9,6 +9,7 @@ import (
 // VerifyAccess an account has access to a resource using the rules provided. If the account does not have
 // access an error will be returned. If there are no rules provided which match the resource, an error
 // will be returned
+//nolint:gocyclo
 func VerifyAccess(rules []*Rule, acc *Account, res *Resource) error {
 	// the rule is only to be applied if the type matches the resource or is catch-all (*)
 	validTypes := []string{"*", res.Type}

auth/rules_test.go

@@ -24,11 +24,11 @@ func TestVerify(t *testing.T) {
 	}
 
 	tt := []struct {
-		Name     string
-		Rules    []*Rule
+		Error    error
 		Account  *Account
 		Resource *Resource
-		Error    error
+		Name     string
+		Rules    []*Rule
 	}{
 		{
 			Name:     "NoRules",

broker/broker.go

@@ -3,48 +3,128 @@ package broker
 
 import (
 	"context"
+	"errors"
 
 	"github.com/unistack-org/micro/v3/metadata"
 )
 
+// DefaultBroker default memory broker
+var DefaultBroker Broker = NewBroker()
+
 var (
-	// DefaultBroker default broker
-	DefaultBroker Broker = NewBroker()
+	// ErrNotConnected returns when broker used but not connected yet
+	ErrNotConnected = errors.New("broker not connected")
+	// ErrDisconnected returns when broker disconnected
+	ErrDisconnected = errors.New("broker disconnected")
 )
 
 // Broker is an interface used for asynchronous messaging.
 type Broker interface {
+	// Name returns broker instance name
 	Name() string
-	Init(...Option) error
+	// Init initilize broker
+	Init(opts ...Option) error
+	// Options returns broker options
 	Options() Options
+	// Address return configured address
 	Address() string
-	Connect(context.Context) error
-	Disconnect(context.Context) error
-	Publish(context.Context, string, *Message, ...PublishOption) error
-	Subscribe(context.Context, string, Handler, ...SubscribeOption) (Subscriber, error)
+	// Connect connects to broker
+	Connect(ctx context.Context) error
+	// Disconnect disconnect from broker
+	Disconnect(ctx context.Context) error
+	// Publish message to broker topic
+	Publish(ctx context.Context, topic string, msg *Message, opts ...PublishOption) error
+	// Subscribe subscribes to topic message via handler
+	Subscribe(ctx context.Context, topic string, h Handler, opts ...SubscribeOption) (Subscriber, error)
+	// BatchPublish messages to broker with multiple topics
+	BatchPublish(ctx context.Context, msgs []*Message, opts ...PublishOption) error
+	// BatchSubscribe subscribes to topic messages via handler
+	BatchSubscribe(ctx context.Context, topic string, h BatchHandler, opts ...SubscribeOption) (Subscriber, error)
+	// String type of broker
 	String() string
 }
 
 // Handler is used to process messages via a subscription of a topic.
 type Handler func(Event) error
 
+// Events contains multiple events
+type Events []Event
+
+func (evs Events) Ack() error {
+	var err error
+	for _, ev := range evs {
+		if err = ev.Ack(); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (evs Events) SetError(err error) {
+	for _, ev := range evs {
+		ev.SetError(err)
+	}
+}
+
+// BatchHandler is used to process messages in batches via a subscription of a topic.
+type BatchHandler func(Events) error
+
 // Event is given to a subscription handler for processing
 type Event interface {
+	// Topic returns event topic
 	Topic() string
+	// Message returns broker message
 	Message() *Message
+	// Ack acknowledge message
 	Ack() error
+	// Error returns message error (like decoding errors or some other)
 	Error() error
+	// SetError set event processing error
+	SetError(err error)
+}
+
+// RawMessage is a raw encoded JSON value.
+// It implements Marshaler and Unmarshaler and can be used to delay decoding or precompute a encoding.
+type RawMessage []byte
+
+// MarshalJSON returns m as the JSON encoding of m.
+func (m *RawMessage) MarshalJSON() ([]byte, error) {
+	if m == nil {
+		return []byte("null"), nil
+	}
+	return *m, nil
+}
+
+// UnmarshalJSON sets *m to a copy of data.
+func (m *RawMessage) UnmarshalJSON(data []byte) error {
+	if m == nil {
+		return errors.New("RawMessage UnmarshalJSON on nil pointer")
+	}
+	*m = append((*m)[0:0], data...)
+	return nil
 }
 
 // Message is used to transfer data
 type Message struct {
-	Header metadata.Metadata // contains message metadata
-	Body   []byte            // contains message body
+	// Header contains message metadata
+	Header metadata.Metadata
+	// Body contains message body
+	Body RawMessage
+}
+
+// NewMessage create broker message with topic filled
+func NewMessage(topic string) *Message {
+	m := &Message{Header: metadata.New(2)}
+	m.Header.Set(metadata.HeaderTopic, topic)
+	return m
 }
 
 // Subscriber is a convenience return type for the Subscribe method
 type Subscriber interface {
+	// Options returns subscriber options
 	Options() SubscribeOptions
+	// Topic returns topic for subscription
 	Topic() string
-	Unsubscribe(context.Context) error
+	// Unsubscribe from topic
+	Unsubscribe(ctx context.Context) error
 }

broker/memory.go

@@ -0,0 +1,371 @@
+package broker
+
+import (
+	"context"
+	"sync"
+
+	"github.com/unistack-org/micro/v3/logger"
+	"github.com/unistack-org/micro/v3/metadata"
+	maddr "github.com/unistack-org/micro/v3/util/addr"
+	"github.com/unistack-org/micro/v3/util/id"
+	mnet "github.com/unistack-org/micro/v3/util/net"
+	"github.com/unistack-org/micro/v3/util/rand"
+)
+
+type memoryBroker struct {
+	subscribers map[string][]*memorySubscriber
+	addr        string
+	opts        Options
+	sync.RWMutex
+	connected bool
+}
+
+type memoryEvent struct {
+	err     error
+	message interface{}
+	topic   string
+	opts    Options
+}
+
+type memorySubscriber struct {
+	ctx          context.Context
+	exit         chan bool
+	handler      Handler
+	batchhandler BatchHandler
+	id           string
+	topic        string
+	opts         SubscribeOptions
+}
+
+func (m *memoryBroker) Options() Options {
+	return m.opts
+}
+
+func (m *memoryBroker) Address() string {
+	return m.addr
+}
+
+func (m *memoryBroker) Connect(ctx context.Context) error {
+	m.Lock()
+	defer m.Unlock()
+
+	if m.connected {
+		return nil
+	}
+
+	// use 127.0.0.1 to avoid scan of all network interfaces
+	addr, err := maddr.Extract("127.0.0.1")
+	if err != nil {
+		return err
+	}
+	var rng rand.Rand
+	i := rng.Intn(20000)
+	// set addr with port
+	addr = mnet.HostPort(addr, 10000+i)
+
+	m.addr = addr
+	m.connected = true
+
+	return nil
+}
+
+func (m *memoryBroker) Disconnect(ctx context.Context) error {
+	m.Lock()
+	defer m.Unlock()
+
+	if !m.connected {
+		return nil
+	}
+
+	m.connected = false
+	return nil
+}
+
+func (m *memoryBroker) Init(opts ...Option) error {
+	for _, o := range opts {
+		o(&m.opts)
+	}
+	return nil
+}
+
+func (m *memoryBroker) Publish(ctx context.Context, topic string, msg *Message, opts ...PublishOption) error {
+	m.RLock()
+	if !m.connected {
+		m.RUnlock()
+		return ErrNotConnected
+	}
+	m.RUnlock()
+
+	options := NewPublishOptions(opts...)
+	vs := make([]msgWrapper, 0, 1)
+	if m.opts.Codec == nil || options.BodyOnly {
+		topic, _ := msg.Header.Get(metadata.HeaderTopic)
+		vs = append(vs, msgWrapper{topic: topic, body: msg})
+	} else {
+		topic, _ := msg.Header.Get(metadata.HeaderTopic)
+		buf, err := m.opts.Codec.Marshal(msg)
+		if err != nil {
+			return err
+		}
+		vs = append(vs, msgWrapper{topic: topic, body: buf})
+	}
+
+	return m.publish(ctx, vs, opts...)
+}
+
+type msgWrapper struct {
+	body  interface{}
+	topic string
+}
+
+func (m *memoryBroker) BatchPublish(ctx context.Context, msgs []*Message, opts ...PublishOption) error {
+	m.RLock()
+	if !m.connected {
+		m.RUnlock()
+		return ErrNotConnected
+	}
+	m.RUnlock()
+
+	options := NewPublishOptions(opts...)
+	vs := make([]msgWrapper, 0, len(msgs))
+	if m.opts.Codec == nil || options.BodyOnly {
+		for _, msg := range msgs {
+			topic, _ := msg.Header.Get(metadata.HeaderTopic)
+			vs = append(vs, msgWrapper{topic: topic, body: msg})
+		}
+	} else {
+		for _, msg := range msgs {
+			topic, _ := msg.Header.Get(metadata.HeaderTopic)
+			buf, err := m.opts.Codec.Marshal(msg)
+			if err != nil {
+				return err
+			}
+			vs = append(vs, msgWrapper{topic: topic, body: buf})
+		}
+	}
+
+	return m.publish(ctx, vs, opts...)
+}
+
+func (m *memoryBroker) publish(ctx context.Context, vs []msgWrapper, opts ...PublishOption) error {
+	var err error
+
+	msgTopicMap := make(map[string]Events)
+	for _, v := range vs {
+		p := &memoryEvent{
+			topic:   v.topic,
+			message: v.body,
+			opts:    m.opts,
+		}
+		msgTopicMap[p.topic] = append(msgTopicMap[p.topic], p)
+	}
+
+	beh := m.opts.BatchErrorHandler
+	eh := m.opts.ErrorHandler
+
+	for t, ms := range msgTopicMap {
+		m.RLock()
+		subs, ok := m.subscribers[t]
+		m.RUnlock()
+		if !ok {
+			continue
+		}
+
+		for _, sub := range subs {
+			if sub.opts.BatchErrorHandler != nil {
+				beh = sub.opts.BatchErrorHandler
+			}
+			if sub.opts.ErrorHandler != nil {
+				eh = sub.opts.ErrorHandler
+			}
+
+			switch {
+			// batch processing
+			case sub.batchhandler != nil:
+				if err = sub.batchhandler(ms); err != nil {
+					ms.SetError(err)
+					if beh != nil {
+						_ = beh(ms)
+					} else if m.opts.Logger.V(logger.ErrorLevel) {
+						m.opts.Logger.Error(m.opts.Context, err.Error())
+					}
+				} else if sub.opts.AutoAck {
+					if err = ms.Ack(); err != nil {
+						m.opts.Logger.Errorf(m.opts.Context, "ack failed: %v", err)
+					}
+				}
+				// single processing
+			case sub.handler != nil:
+				for _, p := range ms {
+					if err = sub.handler(p); err != nil {
+						p.SetError(err)
+						if eh != nil {
+							_ = eh(p)
+						} else if m.opts.Logger.V(logger.ErrorLevel) {
+							m.opts.Logger.Error(m.opts.Context, err.Error())
+						}
+					} else if sub.opts.AutoAck {
+						if err = p.Ack(); err != nil {
+							m.opts.Logger.Errorf(m.opts.Context, "ack failed: %v", err)
+						}
+					}
+				}
+			}
+		}
+	}
+
+	return nil
+}
+
+func (m *memoryBroker) BatchSubscribe(ctx context.Context, topic string, handler BatchHandler, opts ...SubscribeOption) (Subscriber, error) {
+	m.RLock()
+	if !m.connected {
+		m.RUnlock()
+		return nil, ErrNotConnected
+	}
+	m.RUnlock()
+
+	sid, err := id.New()
+	if err != nil {
+		return nil, err
+	}
+
+	options := NewSubscribeOptions(opts...)
+
+	sub := &memorySubscriber{
+		exit:         make(chan bool, 1),
+		id:           sid,
+		topic:        topic,
+		batchhandler: handler,
+		opts:         options,
+		ctx:          ctx,
+	}
+
+	m.Lock()
+	m.subscribers[topic] = append(m.subscribers[topic], sub)
+	m.Unlock()
+
+	go func() {
+		<-sub.exit
+		m.Lock()
+		newSubscribers := make([]*memorySubscriber, 0, len(m.subscribers)-1)
+		for _, sb := range m.subscribers[topic] {
+			if sb.id == sub.id {
+				continue
+			}
+			newSubscribers = append(newSubscribers, sb)
+		}
+		m.subscribers[topic] = newSubscribers
+		m.Unlock()
+	}()
+
+	return sub, nil
+}
+
+func (m *memoryBroker) Subscribe(ctx context.Context, topic string, handler Handler, opts ...SubscribeOption) (Subscriber, error) {
+	m.RLock()
+	if !m.connected {
+		m.RUnlock()
+		return nil, ErrNotConnected
+	}
+	m.RUnlock()
+
+	sid, err := id.New()
+	if err != nil {
+		return nil, err
+	}
+
+	options := NewSubscribeOptions(opts...)
+
+	sub := &memorySubscriber{
+		exit:    make(chan bool, 1),
+		id:      sid,
+		topic:   topic,
+		handler: handler,
+		opts:    options,
+		ctx:     ctx,
+	}
+
+	m.Lock()
+	m.subscribers[topic] = append(m.subscribers[topic], sub)
+	m.Unlock()
+
+	go func() {
+		<-sub.exit
+		m.Lock()
+		newSubscribers := make([]*memorySubscriber, 0, len(m.subscribers)-1)
+		for _, sb := range m.subscribers[topic] {
+			if sb.id == sub.id {
+				continue
+			}
+			newSubscribers = append(newSubscribers, sb)
+		}
+		m.subscribers[topic] = newSubscribers
+		m.Unlock()
+	}()
+
+	return sub, nil
+}
+
+func (m *memoryBroker) String() string {
+	return "memory"
+}
+
+func (m *memoryBroker) Name() string {
+	return m.opts.Name
+}
+
+func (m *memoryEvent) Topic() string {
+	return m.topic
+}
+
+func (m *memoryEvent) Message() *Message {
+	switch v := m.message.(type) {
+	case *Message:
+		return v
+	case []byte:
+		msg := &Message{}
+		if err := m.opts.Codec.Unmarshal(v, msg); err != nil {
+			if m.opts.Logger.V(logger.ErrorLevel) {
+				m.opts.Logger.Error(m.opts.Context, "[memory]: failed to unmarshal: %v", err)
+			}
+			return nil
+		}
+		return msg
+	}
+
+	return nil
+}
+
+func (m *memoryEvent) Ack() error {
+	return nil
+}
+
+func (m *memoryEvent) Error() error {
+	return m.err
+}
+
+func (m *memoryEvent) SetError(err error) {
+	m.err = err
+}
+
+func (m *memorySubscriber) Options() SubscribeOptions {
+	return m.opts
+}
+
+func (m *memorySubscriber) Topic() string {
+	return m.topic
+}
+
+func (m *memorySubscriber) Unsubscribe(ctx context.Context) error {
+	m.exit <- true
+	return nil
+}
+
+// NewBroker return new memory broker
+func NewBroker(opts ...Option) Broker {
+	return &memoryBroker{
+		opts:        NewOptions(opts...),
+		subscribers: make(map[string][]*memorySubscriber),
+	}
+}

broker/memory_test.go

@@ -0,0 +1,105 @@
+package broker
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	"github.com/unistack-org/micro/v3/metadata"
+)
+
+func TestMemoryBatchBroker(t *testing.T) {
+	b := NewBroker()
+	ctx := context.Background()
+
+	if err := b.Connect(ctx); err != nil {
+		t.Fatalf("Unexpected connect error %v", err)
+	}
+
+	topic := "test"
+	count := 10
+
+	fn := func(evts Events) error {
+		return evts.Ack()
+	}
+
+	sub, err := b.BatchSubscribe(ctx, topic, fn)
+	if err != nil {
+		t.Fatalf("Unexpected error subscribing %v", err)
+	}
+
+	msgs := make([]*Message, 0, 0)
+	for i := 0; i < count; i++ {
+		message := &Message{
+			Header: map[string]string{
+				metadata.HeaderTopic: topic,
+				"foo":                "bar",
+				"id":                 fmt.Sprintf("%d", i),
+			},
+			Body: []byte(`"hello world"`),
+		}
+		msgs = append(msgs, message)
+	}
+
+	if err := b.BatchPublish(ctx, msgs); err != nil {
+		t.Fatalf("Unexpected error publishing %v", err)
+	}
+
+	if err := sub.Unsubscribe(ctx); err != nil {
+		t.Fatalf("Unexpected error unsubscribing from %s: %v", topic, err)
+	}
+
+	if err := b.Disconnect(ctx); err != nil {
+		t.Fatalf("Unexpected connect error %v", err)
+	}
+}
+
+func TestMemoryBroker(t *testing.T) {
+	b := NewBroker()
+	ctx := context.Background()
+
+	if err := b.Connect(ctx); err != nil {
+		t.Fatalf("Unexpected connect error %v", err)
+	}
+
+	topic := "test"
+	count := 10
+
+	fn := func(p Event) error {
+		return nil
+	}
+
+	sub, err := b.Subscribe(ctx, topic, fn)
+	if err != nil {
+		t.Fatalf("Unexpected error subscribing %v", err)
+	}
+
+	msgs := make([]*Message, 0, 0)
+	for i := 0; i < count; i++ {
+		message := &Message{
+			Header: map[string]string{
+				metadata.HeaderTopic: topic,
+				"foo":                "bar",
+				"id":                 fmt.Sprintf("%d", i),
+			},
+			Body: []byte(`"hello world"`),
+		}
+		msgs = append(msgs, message)
+
+		if err := b.Publish(ctx, topic, message); err != nil {
+			t.Fatalf("Unexpected error publishing %d err: %v", i, err)
+		}
+	}
+
+	if err := b.BatchPublish(ctx, msgs); err != nil {
+		t.Fatalf("Unexpected error publishing %v", err)
+	}
+
+	if err := sub.Unsubscribe(ctx); err != nil {
+		t.Fatalf("Unexpected error unsubscribing from %s: %v", topic, err)
+	}
+
+	if err := b.Disconnect(ctx); err != nil {
+		t.Fatalf("Unexpected connect error %v", err)
+	}
+}

broker/noop.go

@@ -1,81 +0,0 @@
-package broker
-
-import "context"
-
-type noopBroker struct {
-	opts Options
-}
-
-type noopSubscriber struct {
-	topic string
-	opts  SubscribeOptions
-}
-
-// NewBroker returns new noop broker
-func NewBroker(opts ...Option) Broker {
-	return &noopBroker{opts: NewOptions(opts...)}
-}
-
-func (n *noopBroker) Name() string {
-	return n.opts.Name
-}
-
-// Init initialize broker
-func (n *noopBroker) Init(opts ...Option) error {
-	for _, o := range opts {
-		o(&n.opts)
-	}
-
-	return nil
-}
-
-// Options returns broker Options
-func (n *noopBroker) Options() Options {
-	return n.opts
-}
-
-// Address returns broker address
-func (n *noopBroker) Address() string {
-	return ""
-}
-
-// Connect connects to broker
-func (n *noopBroker) Connect(ctx context.Context) error {
-	return nil
-}
-
-// Disconnect disconnects from broker
-func (n *noopBroker) Disconnect(ctx context.Context) error {
-	return nil
-}
-
-// Publish publishes message to broker
-func (n *noopBroker) Publish(ctx context.Context, topic string, m *Message, opts ...PublishOption) error {
-	return nil
-}
-
-// Subscribe subscribes to broker topic
-func (n *noopBroker) Subscribe(ctx context.Context, topic string, h Handler, opts ...SubscribeOption) (Subscriber, error) {
-	options := NewSubscribeOptions(opts...)
-	return &noopSubscriber{topic: topic, opts: options}, nil
-}
-
-// String return broker string representation
-func (n *noopBroker) String() string {
-	return "noop"
-}
-
-// Options returns subscriber options
-func (n *noopSubscriber) Options() SubscribeOptions {
-	return n.opts
-}
-
-// TOpic returns subscriber topic
-func (n *noopSubscriber) Topic() string {
-	return n.topic
-}
-
-// Unsubscribe unsbscribes from broker topic
-func (n *noopSubscriber) Unsubscribe(ctx context.Context) error {
-	return nil
-}

broker/options.go

@@ -3,6 +3,7 @@ package broker
 import (
 	"context"
 	"crypto/tls"
+	"time"
 
 	"github.com/unistack-org/micro/v3/codec"
 	"github.com/unistack-org/micro/v3/logger"
@@ -13,25 +14,28 @@ import (
 
 // Options struct
 type Options struct {
-	Name string
-	// Addrs useed by broker
-	Addrs []string
-	// ErrorHandler executed when errors occur processing messages
-	ErrorHandler Handler
-	// Codec used to marshal/unmarshal messages
-	Codec codec.Codec
-	// Logger the used logger
-	Logger logger.Logger
-	// Meter the used for metrics
-	Meter meter.Meter
-	// Tracer used for trace
+	// Tracer used for tracing
 	Tracer tracer.Tracer
-	// TLSConfig for secure communication
-	TLSConfig *tls.Config
-	// Register used for clustering
+	// Register can be used for clustering
 	Register register.Register
-	// Context is used for non default options
+	// Codec holds the codec for marshal/unmarshal
+	Codec codec.Codec
+	// Logger used for logging
+	Logger logger.Logger
+	// Meter used for metrics
+	Meter meter.Meter
+	// Context holds external options
 	Context context.Context
+	// TLSConfig holds tls.TLSConfig options
+	TLSConfig *tls.Config
+	// ErrorHandler used when broker can't unmarshal incoming message
+	ErrorHandler Handler
+	// BatchErrorHandler used when broker can't unmashal incoming messages
+	BatchErrorHandler BatchHandler
+	// Name holds the broker name
+	Name string
+	// Addrs holds the broker address
+	Addrs []string
 }
 
 // NewOptions create new Options
@@ -59,10 +63,10 @@ func Context(ctx context.Context) Option {
 
 // PublishOptions struct
 type PublishOptions struct {
-	// BodyOnly says that only body of the message must be published
-	BodyOnly bool
-	// Context for non default options
+	// Context holds external options
 	Context context.Context
+	// BodyOnly flag says the message contains raw body bytes
+	BodyOnly bool
 }
 
 // NewPublishOptions creates PublishOptions struct
@@ -70,32 +74,30 @@ func NewPublishOptions(opts ...PublishOption) PublishOptions {
 	options := PublishOptions{
 		Context: context.Background(),
 	}
-
 	for _, o := range opts {
 		o(&options)
 	}
-
 	return options
 }
 
 // SubscribeOptions struct
 type SubscribeOptions struct {
-	// AutoAck ack messages if handler returns nil err
-	AutoAck bool
-
-	// ErrorHandler executed when errors occur processing messages
-	ErrorHandler Handler
-
-	// Group for subscriber, Subscribers with the same group name
-	// will create a shared subscription where each
-	// receives a subset of messages.
-	Group string
-
-	// BodyOnly says that consumed only body of the message
-	BodyOnly bool
-
-	// Context is used for non default options
+	// Context holds external options
 	Context context.Context
+	// ErrorHandler used when broker can't unmarshal incoming message
+	ErrorHandler Handler
+	// BatchErrorHandler used when broker can't unmashal incoming messages
+	BatchErrorHandler BatchHandler
+	// Group holds consumer group
+	Group string
+	// AutoAck flag specifies auto ack of incoming message when no error happens
+	AutoAck bool
+	// BodyOnly flag specifies that message contains only body bytes without header
+	BodyOnly bool
+	// BatchSize flag specifies max batch size
+	BatchSize int
+	// BatchWait flag specifies max wait time for batch filling
+	BatchWait time.Duration
 }
 
 // Option func
@@ -118,23 +120,6 @@ func PublishContext(ctx context.Context) PublishOption {
 	}
 }
 
-// SubscribeOption func
-type SubscribeOption func(*SubscribeOptions)
-
-// NewSubscribeOptions creates new SubscribeOptions
-func NewSubscribeOptions(opts ...SubscribeOption) SubscribeOptions {
-	options := SubscribeOptions{
-		AutoAck: true,
-		Context: context.Background(),
-	}
-
-	for _, o := range opts {
-		o(&options)
-	}
-
-	return options
-}
-
 // Addrs sets the host addresses to be used by the broker
 func Addrs(addrs ...string) Option {
 	return func(o *Options) {
@@ -150,28 +135,6 @@ func Codec(c codec.Codec) Option {
 	}
 }
 
-// DisableAutoAck disables auto ack
-func DisableAutoAck() SubscribeOption {
-	return func(o *SubscribeOptions) {
-		o.AutoAck = false
-	}
-}
-
-// SubscribeAutoAck will disable auto acking of messages
-// after they have been handled.
-func SubscribeAutoAck(b bool) SubscribeOption {
-	return func(o *SubscribeOptions) {
-		o.AutoAck = b
-	}
-}
-
-// SubscribeBodyOnly consumes only body of the message
-func SubscribeBodyOnly(b bool) SubscribeOption {
-	return func(o *SubscribeOptions) {
-		o.BodyOnly = b
-	}
-}
-
 // ErrorHandler will catch all broker errors that cant be handled
 // in normal way, for example Codec errors
 func ErrorHandler(h Handler) Option {
@@ -180,6 +143,14 @@ func ErrorHandler(h Handler) Option {
 	}
 }
 
+// BatchErrorHandler will catch all broker errors that cant be handled
+// in normal way, for example Codec errors
+func BatchErrorHandler(h BatchHandler) Option {
+	return func(o *Options) {
+		o.BatchErrorHandler = h
+	}
+}
+
 // SubscribeErrorHandler will catch all broker errors that cant be handled
 // in normal way, for example Codec errors
 func SubscribeErrorHandler(h Handler) SubscribeOption {
@@ -188,6 +159,14 @@ func SubscribeErrorHandler(h Handler) SubscribeOption {
 	}
 }
 
+// SubscribeBatchErrorHandler will catch all broker errors that cant be handled
+// in normal way, for example Codec errors
+func SubscribeBatchErrorHandler(h BatchHandler) SubscribeOption {
+	return func(o *SubscribeOptions) {
+		o.BatchErrorHandler = h
+	}
+}
+
 // Queue sets the subscribers queue
 // Deprecated
 func Queue(name string) SubscribeOption {
@@ -251,3 +230,55 @@ func SubscribeContext(ctx context.Context) SubscribeOption {
 		o.Context = ctx
 	}
 }
+
+// DisableAutoAck disables auto ack
+// Deprecated
+func DisableAutoAck() SubscribeOption {
+	return func(o *SubscribeOptions) {
+		o.AutoAck = false
+	}
+}
+
+// SubscribeAutoAck contol auto acking of messages
+// after they have been handled.
+func SubscribeAutoAck(b bool) SubscribeOption {
+	return func(o *SubscribeOptions) {
+		o.AutoAck = b
+	}
+}
+
+// SubscribeBodyOnly consumes only body of the message
+func SubscribeBodyOnly(b bool) SubscribeOption {
+	return func(o *SubscribeOptions) {
+		o.BodyOnly = b
+	}
+}
+
+// SubscribeBatchSize specifies max batch size
+func SubscribeBatchSize(n int) SubscribeOption {
+	return func(o *SubscribeOptions) {
+		o.BatchSize = n
+	}
+}
+
+// SubscribeBatchWait specifies max batch wait time
+func SubscribeBatchWait(td time.Duration) SubscribeOption {
+	return func(o *SubscribeOptions) {
+		o.BatchWait = td
+	}
+}
+
+// SubscribeOption func
+type SubscribeOption func(*SubscribeOptions)
+
+// NewSubscribeOptions creates new SubscribeOptions
+func NewSubscribeOptions(opts ...SubscribeOption) SubscribeOptions {
+	options := SubscribeOptions{
+		AutoAck: true,
+		Context: context.Background(),
+	}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}

build/build.go

@@ -21,12 +21,12 @@ type Source struct {
 
 // Package is packaged format for source
 type Package struct {
+	// Source of the package
+	Source *Source
 	// Name of the package
 	Name string
 	// Location of the package
 	Path string
 	// Type of package e.g tarball, binary, docker
 	Type string
-	// Source of the package
-	Source *Source
 }

client/client.go

@@ -12,6 +12,20 @@ import (
 var (
 	// DefaultClient is the global default client
 	DefaultClient Client = NewClient()
+	// DefaultContentType is the default content-type if not specified
+	DefaultContentType = "application/json"
+	// DefaultBackoff is the default backoff function for retries
+	DefaultBackoff = exponentialBackoff
+	// DefaultRetry is the default check-for-retry function for retries
+	DefaultRetry = RetryNever
+	// DefaultRetries is the default number of times a request is tried
+	DefaultRetries = 0
+	// DefaultRequestTimeout is the default request timeout
+	DefaultRequestTimeout = time.Second * 5
+	// DefaultPoolSize sets the connection pool size
+	DefaultPoolSize = 100
+	// DefaultPoolTTL sets the connection pool ttl
+	DefaultPoolTTL = time.Minute
 )
 
 // Client is the interface used to make requests to services.
@@ -19,13 +33,14 @@ var (
 // It also supports bidirectional streaming of requests.
 type Client interface {
 	Name() string
-	Init(...Option) error
+	Init(opts ...Option) error
 	Options() Options
 	NewMessage(topic string, msg interface{}, opts ...MessageOption) Message
-	NewRequest(service, endpoint string, req interface{}, reqOpts ...RequestOption) Request
+	NewRequest(service string, endpoint string, req interface{}, opts ...RequestOption) Request
 	Call(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error
 	Stream(ctx context.Context, req Request, opts ...CallOption) (Stream, error)
 	Publish(ctx context.Context, msg Message, opts ...PublishOption) error
+	BatchPublish(ctx context.Context, msg []Message, opts ...PublishOption) error
 	String() string
 }
 
@@ -73,9 +88,9 @@ type Stream interface {
 	// The response read
 	Response() Response
 	// Send will encode and send a request
-	Send(interface{}) error
+	Send(msg interface{}) error
 	// Recv will decode and read a response
-	Recv(interface{}) error
+	Recv(msg interface{}) error
 	// Error returns the stream error
 	Error() error
 	// Close closes the stream
@@ -96,18 +111,3 @@ type MessageOption func(*MessageOptions)
 
 // RequestOption used by NewRequest
 type RequestOption func(*RequestOptions)
-
-var (
-	// DefaultBackoff is the default backoff function for retries
-	DefaultBackoff = exponentialBackoff
-	// DefaultRetry is the default check-for-retry function for retries
-	DefaultRetry = RetryNever
-	// DefaultRetries is the default number of times a request is tried
-	DefaultRetries = 0
-	// DefaultRequestTimeout is the default request timeout
-	DefaultRequestTimeout = time.Second * 5
-	// DefaultPoolSize sets the connection pool size
-	DefaultPoolSize = 100
-	// DefaultPoolTTL sets the connection pool ttl
-	DefaultPoolTTL = time.Minute
-)

client/noop.go

@@ -9,20 +9,10 @@ import (
 	"github.com/unistack-org/micro/v3/metadata"
 )
 
-var (
-	// DefaultCodecs will be used to encode/decode data
-	DefaultCodecs = map[string]codec.Codec{
-		//"application/json":         cjson.NewCodec,
-		//"application/json-rpc":     cjsonrpc.NewCodec,
-		//"application/protobuf":     cproto.NewCodec,
-		//"application/proto-rpc":    cprotorpc.NewCodec,
-		"application/octet-stream": codec.NewCodec(),
-	}
-)
-
-const (
-	defaultContentType = "application/json"
-)
+// DefaultCodecs will be used to encode/decode data
+var DefaultCodecs = map[string]codec.Codec{
+	"application/octet-stream": codec.NewCodec(),
+}
 
 type noopClient struct {
 	opts Options
@@ -35,18 +25,27 @@ type noopMessage struct {
 }
 
 type noopRequest struct {
+	body        interface{}
+	codec       codec.Codec
 	service     string
 	method      string
 	endpoint    string
 	contentType string
-	body        interface{}
-	codec       codec.Codec
 	stream      bool
 }
 
 // NewClient returns new noop client
 func NewClient(opts ...Option) Client {
-	return &noopClient{opts: NewOptions(opts...)}
+	nc := &noopClient{opts: NewOptions(opts...)}
+	// wrap in reverse
+
+	c := Client(nc)
+
+	for i := len(nc.opts.Wrappers); i > 0; i-- {
+		c = nc.opts.Wrappers[i-1](c)
+	}
+
+	return c
 }
 
 func (n *noopClient) Name() string {
@@ -170,11 +169,11 @@ func (n *noopClient) Call(ctx context.Context, req Request, rsp interface{}, opt
 }
 
 func (n *noopClient) NewRequest(service, endpoint string, req interface{}, opts ...RequestOption) Request {
-	return &noopRequest{}
+	return &noopRequest{service: service, endpoint: endpoint}
 }
 
 func (n *noopClient) NewMessage(topic string, msg interface{}, opts ...MessageOption) Message {
-	options := NewMessageOptions(opts...)
+	options := NewMessageOptions(append([]MessageOption{MessageContentType(n.opts.ContentType)}, opts...)...)
 	return &noopMessage{topic: topic, payload: msg, opts: options}
 }
 
@@ -182,45 +181,60 @@ func (n *noopClient) Stream(ctx context.Context, req Request, opts ...CallOption
 	return &noopStream{}, nil
 }
 
-func (n *noopClient) Publish(ctx context.Context, p Message, opts ...PublishOption) error {
-	var body []byte
+func (n *noopClient) BatchPublish(ctx context.Context, ps []Message, opts ...PublishOption) error {
+	return n.publish(ctx, ps, opts...)
+}
 
+func (n *noopClient) Publish(ctx context.Context, p Message, opts ...PublishOption) error {
+	return n.publish(ctx, []Message{p}, opts...)
+}
+
+func (n *noopClient) publish(ctx context.Context, ps []Message, opts ...PublishOption) error {
 	options := NewPublishOptions(opts...)
 
-	md, ok := metadata.FromContext(ctx)
-	if !ok {
-		md = metadata.New(0)
-	}
-	md["Content-Type"] = p.ContentType()
-	md["Micro-Topic"] = p.Topic()
+	msgs := make([]*broker.Message, 0, len(ps))
 
-	// passed in raw data
-	if d, ok := p.Payload().(*codec.Frame); ok {
-		body = d.Data
-	} else {
-		// use codec for payload
-		cf, err := n.newCodec(p.ContentType())
-		if err != nil {
-			return errors.InternalServerError("go.micro.client", err.Error())
+	for _, p := range ps {
+		md, ok := metadata.FromOutgoingContext(ctx)
+		if !ok {
+			md = metadata.New(0)
+		}
+		md[metadata.HeaderContentType] = p.ContentType()
+
+		topic := p.Topic()
+
+		// get the exchange
+		if len(options.Exchange) > 0 {
+			topic = options.Exchange
 		}
 
-		// set the body
-		b, err := cf.Marshal(p.Payload())
-		if err != nil {
-			return errors.InternalServerError("go.micro.client", err.Error())
+		md[metadata.HeaderTopic] = topic
+
+		var body []byte
+
+		// passed in raw data
+		if d, ok := p.Payload().(*codec.Frame); ok {
+			body = d.Data
+		} else {
+			// use codec for payload
+			cf, err := n.newCodec(p.ContentType())
+			if err != nil {
+				return errors.InternalServerError("go.micro.client", err.Error())
+			}
+
+			// set the body
+			b, err := cf.Marshal(p.Payload())
+			if err != nil {
+				return errors.InternalServerError("go.micro.client", err.Error())
+			}
+			body = b
 		}
-		body = b
+
+		msgs = append(msgs, &broker.Message{Header: md, Body: body})
 	}
 
-	topic := p.Topic()
-
-	// get the exchange
-	if len(options.Exchange) > 0 {
-		topic = options.Exchange
-	}
-
-	return n.opts.Broker.Publish(ctx, topic, &broker.Message{
-		Header: md,
-		Body:   body,
-	}, broker.PublishContext(options.Context))
+	return n.opts.Broker.BatchPublish(ctx, msgs,
+		broker.PublishContext(options.Context),
+		broker.PublishBodyOnly(options.BodyOnly),
+	)
 }

client/options.go

@@ -2,6 +2,7 @@ package client
 
 import (
 	"context"
+	"crypto/tls"
 	"time"
 
 	"github.com/unistack-org/micro/v3/broker"
@@ -18,35 +19,42 @@ import (
 
 // Options holds client options
 type Options struct {
-	Name string
-	// Used to select codec
-	ContentType string
-	// Proxy address to send requests via
-	Proxy string
-
-	// Plugged interfaces
-	Broker    broker.Broker
-	Codecs    map[string]codec.Codec
-	Router    router.Router
-	Selector  selector.Selector
+	// Selector used to select needed address
+	Selector selector.Selector
+	// Logger used to log messages
+	Logger logger.Logger
+	// Tracer used for tracing
+	Tracer tracer.Tracer
+	// Broker used to publish messages
+	Broker broker.Broker
+	// Meter used for metrics
+	Meter meter.Meter
+	// Router used to get route
+	Router router.Router
+	// Transport used for transfer messages
 	Transport transport.Transport
-	Logger    logger.Logger
-	Meter     meter.Meter
-	// Lookup used for looking up routes
-	Lookup LookupFunc
-
-	// Connection Pool
-	PoolSize int
-	PoolTTL  time.Duration
-	Tracer   tracer.Tracer
-	// Wrapper that used client
-	Wrappers []Wrapper
-
-	// CallOptions that used by default
-	CallOptions CallOptions
-
-	// Context is used for non default options
+	// Context is used for external options
 	Context context.Context
+	// Lookup func used to get destination addr
+	Lookup LookupFunc
+	// Codecs map
+	Codecs map[string]codec.Codec
+	// TLSConfig specifies tls.Config for secure connection
+	TLSConfig *tls.Config
+	// Proxy is used for proxy requests
+	Proxy string
+	// ContentType is used to select codec
+	ContentType string
+	// Name is the client name
+	Name string
+	// Wrappers contains wrappers
+	Wrappers []Wrapper
+	// CallOptions contains default CallOptions
+	CallOptions CallOptions
+	// PoolSize connection pool size
+	PoolSize int
+	// PoolTTL connection pool ttl
+	PoolTTL time.Duration
 }
 
 // NewCallOptions creates new call options struct
@@ -60,34 +68,36 @@ func NewCallOptions(opts ...CallOption) CallOptions {
 
 // CallOptions holds client call options
 type CallOptions struct {
-	// Address of remote hosts
-	Address []string
-	// Backoff func
-	Backoff BackoffFunc
-	// Transport Dial Timeout
-	DialTimeout time.Duration
-	// Number of Call attempts
-	Retries int
-	// Check if retriable func
-	Retry RetryFunc
-	// Request/Response timeout
-	RequestTimeout time.Duration
-	// Router to use for this call
+	// Router used for route
 	Router router.Router
-	// Selector to use for the call
+	// Selector selects addr
 	Selector selector.Selector
-	// SelectOptions to use when selecting a route
-	SelectOptions []selector.SelectOption
-	// Stream timeout for the stream
-	StreamTimeout time.Duration
-	// Use the auth token as the authorization header
-	AuthToken bool
-	// Network to lookup the route within
-	Network string
-	// Middleware for low level call func
-	CallWrappers []CallWrapper
-	// Context is uded for non default options
+	// Context used for deadline
 	Context context.Context
+	// Retry func used for retries
+	Retry RetryFunc
+	// Backoff func used for backoff when retry
+	Backoff BackoffFunc
+	// Network name
+	Network string
+	// Content-Type
+	ContentType string
+	// CallWrappers call wrappers
+	CallWrappers []CallWrapper
+	// SelectOptions selector options
+	SelectOptions []selector.SelectOption
+	// Address specifies static addr list
+	Address []string
+	// Retries specifies retries num
+	Retries int
+	// StreamTimeout stream timeout
+	StreamTimeout time.Duration
+	// RequestTimeout request timeout
+	RequestTimeout time.Duration
+	// DialTimeout dial timeout
+	DialTimeout time.Duration
+	// AuthToken string
+	AuthToken string
 }
 
 // Context pass context to client
@@ -108,11 +118,12 @@ func NewPublishOptions(opts ...PublishOption) PublishOptions {
 
 // PublishOptions holds publish options
 type PublishOptions struct {
-	// Exchange is the routing exchange for the message
-	Exchange string
-	// Other options for implementations of the interface
-	// can be stored in a context
+	// BodyOnly will publish only message body
+	BodyOnly bool
+	// Context used for external options
 	Context context.Context
+	// Exchange topic exchange name
+	Exchange string
 }
 
 // NewMessageOptions creates message options struct
@@ -126,6 +137,7 @@ func NewMessageOptions(opts ...MessageOption) MessageOptions {
 
 // MessageOptions holds client message options
 type MessageOptions struct {
+	// ContentType specify content-type of message
 	ContentType string
 }
 
@@ -140,34 +152,38 @@ func NewRequestOptions(opts ...RequestOption) RequestOptions {
 
 // RequestOptions holds client request options
 type RequestOptions struct {
-	ContentType string
-	Stream      bool
-	// Other options for implementations of the interface
-	// can be stored in a context
+	// Context used for external options
 	Context context.Context
+	// ContentType specify content-type of message
+	ContentType string
+	// Stream flag
+	Stream bool
 }
 
 // NewOptions creates new options struct
 func NewOptions(opts ...Option) Options {
 	options := Options{
 		Context:     context.Background(),
-		ContentType: "application/json",
+		ContentType: DefaultContentType,
 		Codecs:      make(map[string]codec.Codec),
 		CallOptions: CallOptions{
+			Context:        context.Background(),
 			Backoff:        DefaultBackoff,
 			Retry:          DefaultRetry,
 			Retries:        DefaultRetries,
 			RequestTimeout: DefaultRequestTimeout,
 			DialTimeout:    transport.DefaultDialTimeout,
 		},
-		Lookup:   LookupRoute,
-		PoolSize: DefaultPoolSize,
-		PoolTTL:  DefaultPoolTTL,
-		Selector: random.NewSelector(),
-		Logger:   logger.DefaultLogger,
-		Broker:   broker.DefaultBroker,
-		Meter:    meter.DefaultMeter,
-		Tracer:   tracer.DefaultTracer,
+		Lookup:    LookupRoute,
+		PoolSize:  DefaultPoolSize,
+		PoolTTL:   DefaultPoolTTL,
+		Selector:  random.NewSelector(),
+		Logger:    logger.DefaultLogger,
+		Broker:    broker.DefaultBroker,
+		Meter:     meter.DefaultMeter,
+		Tracer:    tracer.DefaultTracer,
+		Router:    router.DefaultRouter,
+		Transport: transport.DefaultTransport,
 	}
 
 	for _, o := range opts {
@@ -212,7 +228,7 @@ func Codec(contentType string, c codec.Codec) Option {
 	}
 }
 
-// Default content type of the client
+// ContentType used by default if not specified
 func ContentType(ct string) Option {
 	return func(o *Options) {
 		o.ContentType = ct
@@ -270,22 +286,21 @@ func Selector(s selector.Selector) Option {
 	}
 }
 
-// Adds a Wrapper to a list of options passed into the client
+// Wrap adds a wrapper to the list of options passed into the client
 func Wrap(w Wrapper) Option {
 	return func(o *Options) {
 		o.Wrappers = append(o.Wrappers, w)
 	}
 }
 
-// Adds a Wrapper to the list of CallFunc wrappers
+// WrapCall adds a wrapper to the list of CallFunc wrappers
 func WrapCall(cw ...CallWrapper) Option {
 	return func(o *Options) {
 		o.CallOptions.CallWrappers = append(o.CallOptions.CallWrappers, cw...)
 	}
 }
 
-// Backoff is used to set the backoff function used
-// when retrying Calls
+// Backoff is used to set the backoff function used when retrying Calls
 func Backoff(fn BackoffFunc) Option {
 	return func(o *Options) {
 		o.CallOptions.Backoff = fn
@@ -306,8 +321,23 @@ func Lookup(l LookupFunc) Option {
 	}
 }
 
+// TLSConfig specifies a *tls.Config
+func TLSConfig(t *tls.Config) Option {
+	return func(o *Options) {
+		// set the internal tls
+		o.TLSConfig = t
+
+		// set the default transport if one is not
+		// already set. Required for Init call below.
+
+		// set the transport tls
+		o.Transport.Init(
+			transport.TLSConfig(t),
+		)
+	}
+}
+
 // Retries sets the retry count when making the request.
-// Should this be a Call Option?
 func Retries(i int) Option {
 	return func(o *Options) {
 		o.CallOptions.Retries = i
@@ -322,7 +352,6 @@ func Retry(fn RetryFunc) Option {
 }
 
 // RequestTimeout is the request timeout.
-// Should this be a Call Option?
 func RequestTimeout(d time.Duration) Option {
 	return func(o *Options) {
 		o.CallOptions.RequestTimeout = d
@@ -336,22 +365,43 @@ func StreamTimeout(d time.Duration) Option {
 	}
 }
 
-// Transport dial timeout
+// DialTimeout sets the dial timeout
 func DialTimeout(d time.Duration) Option {
 	return func(o *Options) {
 		o.CallOptions.DialTimeout = d
 	}
 }
 
-// Call Options
-
 // WithExchange sets the exchange to route a message through
+// Deprecated
 func WithExchange(e string) PublishOption {
 	return func(o *PublishOptions) {
 		o.Exchange = e
 	}
 }
 
+// PublishExchange sets the exchange to route a message through
+func PublishExchange(e string) PublishOption {
+	return func(o *PublishOptions) {
+		o.Exchange = e
+	}
+}
+
+// WithBodyOnly publish only message body
+// DERECATED
+func WithBodyOnly(b bool) PublishOption {
+	return func(o *PublishOptions) {
+		o.BodyOnly = b
+	}
+}
+
+// PublishBodyOnly publish only message body
+func PublishBodyOnly(b bool) PublishOption {
+	return func(o *PublishOptions) {
+		o.BodyOnly = b
+	}
+}
+
 // PublishContext sets the context in publish options
 func PublishContext(ctx context.Context) PublishOption {
 	return func(o *PublishOptions) {
@@ -359,6 +409,13 @@ func PublishContext(ctx context.Context) PublishOption {
 	}
 }
 
+// WithContentType specifies call content type
+func WithContentType(ct string) CallOption {
+	return func(o *CallOptions) {
+		o.ContentType = ct
+	}
+}
+
 // WithAddress sets the remote addresses to use rather than using service discovery
 func WithAddress(a ...string) CallOption {
 	return func(o *CallOptions) {
@@ -422,9 +479,9 @@ func WithDialTimeout(d time.Duration) CallOption {
 
 // WithAuthToken is a CallOption which overrides the
 // authorization header with the services own auth token
-func WithAuthToken() CallOption {
+func WithAuthToken(t string) CallOption {
 	return func(o *CallOptions) {
-		o.AuthToken = true
+		o.AuthToken = t
 	}
 }
 
@@ -457,24 +514,30 @@ func WithSelectOptions(sops ...selector.SelectOption) CallOption {
 }
 
 // WithMessageContentType sets the message content type
+// Deprecated
 func WithMessageContentType(ct string) MessageOption {
 	return func(o *MessageOptions) {
 		o.ContentType = ct
 	}
 }
 
-// Request Options
-
-// WithContentType specifies request content type
-func WithContentType(ct string) RequestOption {
-	return func(o *RequestOptions) {
+// MessageContentType sets the message content type
+func MessageContentType(ct string) MessageOption {
+	return func(o *MessageOptions) {
 		o.ContentType = ct
 	}
 }
 
 // StreamingRequest specifies that request is streaming
-func StreamingRequest() RequestOption {
+func StreamingRequest(b bool) RequestOption {
 	return func(o *RequestOptions) {
-		o.Stream = true
+		o.Stream = b
+	}
+}
+
+// RequestContentType specifies request content type
+func RequestContentType(ct string) RequestOption {
+	return func(o *RequestOptions) {
+		o.ContentType = ct
 	}
 }

client/test_request.go

@@ -5,12 +5,12 @@ import (
 )
 
 type testRequest struct {
+	codec       codec.Codec
+	body        interface{}
 	service     string
 	method      string
 	endpoint    string
 	contentType string
-	codec       codec.Codec
-	body        interface{}
 	opts        RequestOptions
 }
 

codec/codec.go

@@ -8,8 +8,8 @@ import (
 	"github.com/unistack-org/micro/v3/metadata"
 )
 
+// Message types
 const (
-	// Message types
 	Error MessageType = iota
 	Request
 	Response
@@ -25,11 +25,14 @@ var (
 
 var (
 	// DefaultMaxMsgSize specifies how much data codec can handle
-	DefaultMaxMsgSize int   = 1024 * 1024 * 4 // 4Mb
-	DefaultCodec      Codec = NewCodec()
+	DefaultMaxMsgSize = 1024 * 1024 * 4 // 4Mb
+	// DefaultCodec is the global default codec
+	DefaultCodec Codec = NewCodec()
+	// DefaultTagName specifies struct tag name to control codec Marshal/Unmarshal
+	DefaultTagName = "codec"
 )
 
-// MessageType
+// MessageType specifies message type for codec
 type MessageType int
 
 // Codec encodes/decodes various types of messages used within micro.
@@ -38,11 +41,11 @@ type MessageType int
 // connection. ReadBody may be called with a nil argument to force the
 // body to be read and discarded.
 type Codec interface {
-	ReadHeader(io.Reader, *Message, MessageType) error
-	ReadBody(io.Reader, interface{}) error
-	Write(io.Writer, *Message, interface{}) error
-	Marshal(interface{}) ([]byte, error)
-	Unmarshal([]byte, interface{}) error
+	ReadHeader(r io.Reader, m *Message, mt MessageType) error
+	ReadBody(r io.Reader, v interface{}) error
+	Write(w io.Writer, m *Message, v interface{}) error
+	Marshal(v interface{}, opts ...Option) ([]byte, error)
+	Unmarshal(b []byte, v interface{}, opts ...Option) error
 	String() string
 }
 
@@ -50,16 +53,14 @@ type Codec interface {
 // the communication, likely followed by the body.
 // In the case of an error, body may be nil.
 type Message struct {
-	Id       string
-	Type     MessageType
+	Header   metadata.Metadata
 	Target   string
 	Method   string
 	Endpoint string
 	Error    string
-
-	// The values read from the socket
-	Header metadata.Metadata
-	Body   []byte
+	Id       string
+	Body     []byte
+	Type     MessageType
 }
 
 // NewMessage creates new codec message

codec/context.go

@@ -0,0 +1,34 @@
+package codec
+
+import (
+	"context"
+)
+
+type codecKey struct{}
+
+// FromContext returns codec from context
+func FromContext(ctx context.Context) (Codec, bool) {
+	if ctx == nil {
+		return nil, false
+	}
+	c, ok := ctx.Value(codecKey{}).(Codec)
+	return c, ok
+}
+
+// NewContext put codec in context
+func NewContext(ctx context.Context, c Codec) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	return context.WithValue(ctx, codecKey{}, c)
+}
+
+// SetOption returns a function to setup a context with given value
+func SetOption(k, v interface{}) Option {
+	return func(o *Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}

codec/frame.go

@@ -0,0 +1,34 @@
+package codec
+
+// Frame gives us the ability to define raw data to send over the pipes
+type Frame struct {
+	Data []byte
+}
+
+func (m *Frame) MarshalJSON() ([]byte, error) {
+	return m.Data, nil
+}
+
+func (m *Frame) UnmarshalJSON(data []byte) error {
+	m.Data = data
+	return nil
+}
+
+func (m *Frame) ProtoMessage() {}
+
+func (m *Frame) Reset() {
+	*m = Frame{}
+}
+
+func (m *Frame) String() string {
+	return string(m.Data)
+}
+
+func (m *Frame) Marshal() ([]byte, error) {
+	return m.Data, nil
+}
+
+func (m *Frame) Unmarshal(data []byte) error {
+	m.Data = data
+	return nil
+}

codec/frame.proto

@@ -0,0 +1,28 @@
+// Copyright 2021 Unistack LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package micro.codec;
+
+option cc_enable_arenas = true;
+option go_package = "github.com/unistack-org/micro/v3/codec;codec";
+option java_multiple_files = true;
+option java_outer_classname = "MicroCodec";
+option java_package = "micro.codec";
+option objc_class_prefix = "MCODEC";
+
+message Frame {
+  bytes data = 1;
+}

codec/noop.go

@@ -3,15 +3,10 @@ package codec
 import (
 	"encoding/json"
 	"io"
-	"io/ioutil"
 )
 
 type noopCodec struct {
-}
-
-// Frame gives us the ability to define raw data to send over the pipes
-type Frame struct {
-	Data []byte
+	opts Options
 }
 
 func (c *noopCodec) ReadHeader(conn io.Reader, m *Message, t MessageType) error {
@@ -20,7 +15,7 @@ func (c *noopCodec) ReadHeader(conn io.Reader, m *Message, t MessageType) error
 
 func (c *noopCodec) ReadBody(conn io.Reader, b interface{}) error {
 	// read bytes
-	buf, err := ioutil.ReadAll(conn)
+	buf, err := io.ReadAll(conn)
 	if err != nil {
 		return err
 	}
@@ -30,12 +25,8 @@ func (c *noopCodec) ReadBody(conn io.Reader, b interface{}) error {
 	}
 
 	switch v := b.(type) {
-	case string:
-		v = string(buf)
 	case *string:
 		*v = string(buf)
-	case []byte:
-		v = buf
 	case *[]byte:
 		*v = buf
 	case *Frame:
@@ -80,11 +71,11 @@ func (c *noopCodec) String() string {
 }
 
 // NewCodec returns new noop codec
-func NewCodec() Codec {
-	return &noopCodec{}
+func NewCodec(opts ...Option) Codec {
+	return &noopCodec{opts: NewOptions(opts...)}
 }
 
-func (c *noopCodec) Marshal(v interface{}) ([]byte, error) {
+func (c *noopCodec) Marshal(v interface{}, opts ...Option) ([]byte, error) {
 	if v == nil {
 		return nil, nil
 	}
@@ -107,23 +98,23 @@ func (c *noopCodec) Marshal(v interface{}) ([]byte, error) {
 	return json.Marshal(v)
 }
 
-func (c *noopCodec) Unmarshal(d []byte, v interface{}) error {
+func (c *noopCodec) Unmarshal(d []byte, v interface{}, opts ...Option) error {
 	if v == nil {
 		return nil
 	}
 	switch ve := v.(type) {
-	case string:
-		ve = string(d)
 	case *string:
 		*ve = string(d)
-	case []byte:
-		ve = d
+		return nil
 	case *[]byte:
 		*ve = d
+		return nil
 	case *Frame:
 		ve.Data = d
+		return nil
 	case *Message:
 		ve.Body = d
+		return nil
 	}
 
 	return json.Unmarshal(d, v)

codec/noop_test.go

@@ -0,0 +1,34 @@
+package codec
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestNoopBytes(t *testing.T) {
+	req := []byte("test req")
+	rsp := make([]byte, len(req))
+
+	nc := NewCodec()
+	if err := nc.Unmarshal(req, &rsp); err != nil {
+		t.Fatal(err)
+	}
+
+	if !bytes.Equal(req, rsp) {
+		t.Fatalf("req not eq rsp: %s != %s", req, rsp)
+	}
+}
+
+func TestNoopString(t *testing.T) {
+	req := []byte("test req")
+	var rsp string
+
+	nc := NewCodec()
+	if err := nc.Unmarshal(req, &rsp); err != nil {
+		t.Fatal(err)
+	}
+
+	if !bytes.Equal(req, []byte(rsp)) {
+		t.Fatalf("req not eq rsp: %s != %s", req, rsp)
+	}
+}

codec/options.go

@@ -1,6 +1,8 @@
 package codec
 
 import (
+	"context"
+
 	"github.com/unistack-org/micro/v3/logger"
 	"github.com/unistack-org/micro/v3/meter"
 	"github.com/unistack-org/micro/v3/tracer"
@@ -11,10 +13,18 @@ type Option func(*Options)
 
 // Options contains codec options
 type Options struct {
+	// Meter used for metrics
+	Meter meter.Meter
+	// Logger used for logging
+	Logger logger.Logger
+	// Tracer used for tracing
+	Tracer tracer.Tracer
+	// Context stores additional codec options
+	Context context.Context
+	// TagName specifies tag name in struct to control codec
+	TagName string
+	// MaxMsgSize specifies max messages size that reads by codec
 	MaxMsgSize int
-	Meter      meter.Meter
-	Logger     logger.Logger
-	Tracer     tracer.Tracer
 }
 
 // MaxMsgSize sets the max message size
@@ -24,6 +34,13 @@ func MaxMsgSize(n int) Option {
 	}
 }
 
+// TagName sets the codec tag name in struct
+func TagName(n string) Option {
+	return func(o *Options) {
+		o.TagName = n
+	}
+}
+
 // Logger sets the logger
 func Logger(l logger.Logger) Option {
 	return func(o *Options) {
@@ -45,12 +62,15 @@ func Meter(m meter.Meter) Option {
 	}
 }
 
+// NewOptions returns new options
 func NewOptions(opts ...Option) Options {
 	options := Options{
+		Context:    context.Background(),
 		Logger:     logger.DefaultLogger,
 		Meter:      meter.DefaultMeter,
 		Tracer:     tracer.DefaultTracer,
 		MaxMsgSize: DefaultMaxMsgSize,
+		TagName:    DefaultTagName,
 	}
 
 	for _, o := range opts {

config/config.go

@@ -4,12 +4,17 @@ package config
 import (
 	"context"
 	"errors"
+	"time"
 )
 
-var (
-	// DefaultConfig default config
-	DefaultConfig Config = NewConfig()
-)
+// DefaultConfig default config
+var DefaultConfig Config = NewConfig()
+
+// DefaultWatcherMinInterval default min interval for poll changes
+var DefaultWatcherMinInterval = 5 * time.Second
+
+// DefaultWatcherMaxInterval default max interval for poll changes
+var DefaultWatcherMaxInterval = 9 * time.Second
 
 var (
 	// ErrCodecMissing is returned when codec needed and not specified
@@ -22,36 +27,90 @@ var (
 
 // Config is an interface abstraction for dynamic configuration
 type Config interface {
+	// Name returns name of config
 	Name() string
 	// Init the config
 	Init(opts ...Option) error
 	// Options in the config
 	Options() Options
 	// Load config from sources
-	Load(context.Context) error
+	Load(context.Context, ...LoadOption) error
 	// Save config to sources
-	Save(context.Context) error
-	// Watch a value for changes
-	//	Watch(interface{}) (Watcher, error)
+	Save(context.Context, ...SaveOption) error
+	// Watch a config for changes
+	Watch(context.Context, ...WatchOption) (Watcher, error)
+	// String returns config type name
 	String() string
 }
 
 // Watcher is the config watcher
-//type Watcher interface {
-//	Next() (, error)
-//	Stop() error
-//}
+type Watcher interface {
+	// Next blocks until update happens or error returned
+	Next() (map[string]interface{}, error)
+	// Stop stops watcher
+	Stop() error
+}
 
 // Load loads config from config sources
-func Load(ctx context.Context, cs ...Config) error {
+func Load(ctx context.Context, cs []Config, opts ...LoadOption) error {
 	var err error
 	for _, c := range cs {
 		if err = c.Init(); err != nil {
 			return err
 		}
-		if err = c.Load(ctx); err != nil {
+		if err = c.Load(ctx, opts...); err != nil {
 			return err
 		}
 	}
 	return nil
 }
+
+var (
+	DefaultAfterLoad = func(ctx context.Context, c Config) error {
+		for _, fn := range c.Options().AfterLoad {
+			if err := fn(ctx, c); err != nil {
+				c.Options().Logger.Errorf(ctx, "%s AfterLoad err: %v", c.String(), err)
+				if !c.Options().AllowFail {
+					return err
+				}
+			}
+		}
+		return nil
+	}
+
+	DefaultAfterSave = func(ctx context.Context, c Config) error {
+		for _, fn := range c.Options().AfterSave {
+			if err := fn(ctx, c); err != nil {
+				c.Options().Logger.Errorf(ctx, "%s AfterSave err: %v", c.String(), err)
+				if !c.Options().AllowFail {
+					return err
+				}
+			}
+		}
+		return nil
+	}
+
+	DefaultBeforeLoad = func(ctx context.Context, c Config) error {
+		for _, fn := range c.Options().BeforeLoad {
+			if err := fn(ctx, c); err != nil {
+				c.Options().Logger.Errorf(ctx, "%s BeforeLoad err: %v", c.String(), err)
+				if !c.Options().AllowFail {
+					return err
+				}
+			}
+		}
+		return nil
+	}
+
+	DefaultBeforeSave = func(ctx context.Context, c Config) error {
+		for _, fn := range c.Options().BeforeSave {
+			if err := fn(ctx, c); err != nil {
+				c.Options().Logger.Errorf(ctx, "%s BeforeSavec err: %v", c.String(), err)
+				if !c.Options().AllowFail {
+					return err
+				}
+			}
+		}
+		return nil
+	}
+)

config/context.go

@@ -6,6 +6,7 @@ import (
 
 type configKey struct{}
 
+// FromContext returns store from context
 func FromContext(ctx context.Context) (Config, bool) {
 	if ctx == nil {
 		return nil, false
@@ -14,6 +15,7 @@ func FromContext(ctx context.Context) (Config, bool) {
 	return c, ok
 }
 
+// NewContext put store in context
 func NewContext(ctx context.Context, c Config) context.Context {
 	if ctx == nil {
 		ctx = context.Background()

config/default.go

@@ -2,6 +2,7 @@ package config
 
 import (
 	"context"
+	"fmt"
 	"reflect"
 	"strconv"
 	"strings"
@@ -25,35 +26,53 @@ func (c *defaultConfig) Init(opts ...Option) error {
 	return nil
 }
 
-func (c *defaultConfig) Load(ctx context.Context) error {
-	for _, fn := range c.opts.BeforeLoad {
-		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
-			return err
-		}
-	}
-
-	src, err := rutil.Zero(c.opts.Struct)
-	if err == nil {
-		valueOf := reflect.ValueOf(src)
-		if err = c.fillValues(ctx, valueOf); err == nil {
-			err = mergo.Merge(c.opts.Struct, src, mergo.WithOverride, mergo.WithTypeCheck, mergo.WithAppendSlice)
-		}
-	}
-
-	if err != nil && !c.opts.AllowFail {
+func (c *defaultConfig) Load(ctx context.Context, opts ...LoadOption) error {
+	if err := DefaultBeforeLoad(ctx, c); err != nil {
 		return err
 	}
 
-	for _, fn := range c.opts.AfterLoad {
-		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
+	options := NewLoadOptions(opts...)
+	mopts := []func(*mergo.Config){mergo.WithTypeCheck}
+	if options.Override {
+		mopts = append(mopts, mergo.WithOverride)
+	}
+	if options.Append {
+		mopts = append(mopts, mergo.WithAppendSlice)
+	}
+
+	dst := c.opts.Struct
+	if options.Struct != nil {
+		dst = options.Struct
+	}
+
+	src, err := rutil.Zero(dst)
+	if err != nil {
+		if !c.opts.AllowFail {
 			return err
 		}
+		return DefaultAfterLoad(ctx, c)
+	}
+
+	if err = fillValues(reflect.ValueOf(src), c.opts.StructTag); err == nil {
+		err = mergo.Merge(dst, src, mopts...)
+	}
+
+	if err != nil {
+		c.opts.Logger.Errorf(ctx, "default load error: %v", err)
+		if !c.opts.AllowFail {
+			return err
+		}
+	}
+
+	if err := DefaultAfterLoad(ctx, c); err != nil {
+		return err
 	}
 
 	return nil
 }
 
-func (c *defaultConfig) fillValue(ctx context.Context, value reflect.Value, val string) error {
+//nolint:gocyclo
+func fillValue(value reflect.Value, val string) error {
 	if !rutil.IsEmpty(value) {
 		return nil
 	}
@@ -70,10 +89,10 @@ func (c *defaultConfig) fillValue(ctx context.Context, value reflect.Value, val
 			kv := strings.FieldsFunc(nval, func(c rune) bool { return c == '=' })
 			mkey := reflect.Indirect(reflect.New(kt))
 			mval := reflect.Indirect(reflect.New(et))
-			if err := c.fillValue(ctx, mkey, kv[0]); err != nil {
+			if err := fillValue(mkey, kv[0]); err != nil {
 				return err
 			}
-			if err := c.fillValue(ctx, mval, kv[1]); err != nil {
+			if err := fillValue(mval, kv[1]); err != nil {
 				return err
 			}
 			value.SetMapIndex(mkey, mval)
@@ -83,7 +102,7 @@ func (c *defaultConfig) fillValue(ctx context.Context, value reflect.Value, val
 		value.Set(reflect.MakeSlice(reflect.SliceOf(value.Type().Elem()), len(nvals), len(nvals)))
 		for idx, nval := range nvals {
 			nvalue := reflect.Indirect(reflect.New(value.Type().Elem()))
-			if err := c.fillValue(ctx, nvalue, nval); err != nil {
+			if err := fillValue(nvalue, nval); err != nil {
 				return err
 			}
 			value.Index(idx).Set(nvalue)
@@ -107,7 +126,7 @@ func (c *defaultConfig) fillValue(ctx context.Context, value reflect.Value, val
 		if err != nil {
 			return err
 		}
-		value.Set(reflect.ValueOf(float64(v)))
+		value.Set(reflect.ValueOf(v))
 	case reflect.Int:
 		v, err := strconv.ParseInt(val, 10, 0)
 		if err != nil {
@@ -137,7 +156,7 @@ func (c *defaultConfig) fillValue(ctx context.Context, value reflect.Value, val
 		if err != nil {
 			return err
 		}
-		value.Set(reflect.ValueOf(int64(v)))
+		value.Set(reflect.ValueOf(v))
 	case reflect.Uint:
 		v, err := strconv.ParseUint(val, 10, 0)
 		if err != nil {
@@ -167,12 +186,12 @@ func (c *defaultConfig) fillValue(ctx context.Context, value reflect.Value, val
 		if err != nil {
 			return err
 		}
-		value.Set(reflect.ValueOf(uint64(v)))
+		value.Set(reflect.ValueOf(v))
 	}
 	return nil
 }
 
-func (c *defaultConfig) fillValues(ctx context.Context, valueOf reflect.Value) error {
+func fillValues(valueOf reflect.Value, tname string) error {
 	var values reflect.Value
 
 	if valueOf.Kind() == reflect.Ptr {
@@ -199,7 +218,7 @@ func (c *defaultConfig) fillValues(ctx context.Context, valueOf reflect.Value) e
 		switch value.Kind() {
 		case reflect.Struct:
 			value.Set(reflect.Indirect(reflect.New(value.Type())))
-			if err := c.fillValues(ctx, value); err != nil {
+			if err := fillValues(value, tname); err != nil {
 				return err
 			}
 			continue
@@ -213,17 +232,17 @@ func (c *defaultConfig) fillValues(ctx context.Context, valueOf reflect.Value) e
 				value.Set(reflect.New(value.Type().Elem()))
 			}
 			value = value.Elem()
-			if err := c.fillValues(ctx, value); err != nil {
+			if err := fillValues(value, tname); err != nil {
 				return err
 			}
 			continue
 		}
-		tag, ok := field.Tag.Lookup(c.opts.StructTag)
+		tag, ok := field.Tag.Lookup(tname)
 		if !ok {
 			continue
 		}
 
-		if err := c.fillValue(ctx, value, tag); err != nil {
+		if err := fillValue(value, tag); err != nil {
 			return err
 		}
 	}
@@ -231,17 +250,13 @@ func (c *defaultConfig) fillValues(ctx context.Context, valueOf reflect.Value) e
 	return nil
 }
 
-func (c *defaultConfig) Save(ctx context.Context) error {
-	for _, fn := range c.opts.BeforeSave {
-		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
-			return err
-		}
+func (c *defaultConfig) Save(ctx context.Context, opts ...SaveOption) error {
+	if err := DefaultBeforeSave(ctx, c); err != nil {
+		return err
 	}
 
-	for _, fn := range c.opts.AfterSave {
-		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
-			return err
-		}
+	if err := DefaultAfterSave(ctx, c); err != nil {
+		return err
 	}
 
 	return nil
@@ -255,6 +270,11 @@ func (c *defaultConfig) Name() string {
 	return c.opts.Name
 }
 
+func (c *defaultConfig) Watch(ctx context.Context, opts ...WatchOption) (Watcher, error) {
+	return nil, fmt.Errorf("not implemented")
+}
+
+// NewConfig returns new default config source
 func NewConfig(opts ...Option) Config {
 	options := NewOptions(opts...)
 	if len(options.StructTag) == 0 {

config/default_test.go

@@ -10,30 +10,30 @@ import (
 
 type Cfg struct {
 	StringValue string `default:"string_value"`
-	IntValue    int    `default:"99"`
 	IgnoreValue string `json:"-"`
 	StructValue struct {
 		StringValue string `default:"string_value"`
 	}
+	IntValue int `default:"99"`
 }
 
 func TestDefault(t *testing.T) {
 	ctx := context.Background()
 	conf := &Cfg{IntValue: 10}
 	blfn := func(ctx context.Context, cfg config.Config) error {
-		conf, ok := cfg.Options().Struct.(*Cfg)
+		nconf, ok := cfg.Options().Struct.(*Cfg)
 		if !ok {
 			return fmt.Errorf("failed to get Struct from options: %v", cfg.Options())
 		}
-		conf.StringValue = "before_load"
+		nconf.StringValue = "before_load"
 		return nil
 	}
 	alfn := func(ctx context.Context, cfg config.Config) error {
-		conf, ok := cfg.Options().Struct.(*Cfg)
+		nconf, ok := cfg.Options().Struct.(*Cfg)
 		if !ok {
 			return fmt.Errorf("failed to get Struct from options: %v", cfg.Options())
 		}
-		conf.StringValue = "after_load"
+		nconf.StringValue = "after_load"
 		return nil
 	}
 
@@ -47,6 +47,6 @@ func TestDefault(t *testing.T) {
 	if conf.StringValue != "after_load" {
 		t.Fatal("AfterLoad option not working")
 	}
-
-	t.Logf("%#+v\n", conf)
+	_ = conf
+	// t.Logf("%#+v\n", conf)
 }

config/options.go

@@ -2,6 +2,7 @@ package config
 
 import (
 	"context"
+	"time"
 
 	"github.com/unistack-org/micro/v3/codec"
 	"github.com/unistack-org/micro/v3/logger"
@@ -9,31 +10,40 @@ import (
 	"github.com/unistack-org/micro/v3/tracer"
 )
 
+// Options hold the config options
 type Options struct {
-	Name       string
-	AllowFail  bool
-	BeforeLoad []func(context.Context, Config) error
-	AfterLoad  []func(context.Context, Config) error
-	BeforeSave []func(context.Context, Config) error
-	AfterSave  []func(context.Context, Config) error
-	// Struct that holds config data
+	// Struct holds the destination config struct
 	Struct interface{}
-	// StructTag name
-	StructTag string
-	// Logger that will be used
-	Logger logger.Logger
-	// Meter that will be used
-	Meter meter.Meter
-	// Tracer used for trace
-	Tracer tracer.Tracer
 	// Codec that used for load/save
 	Codec codec.Codec
-	// Context for alternative data
+	// Tracer that will be used
+	Tracer tracer.Tracer
+	// Meter that will be used
+	Meter meter.Meter
+	// Logger that will be used
+	Logger logger.Logger
+	// Context used for external options
 	Context context.Context
+	// Name of the config
+	Name string
+	// StructTag name
+	StructTag string
+	// BeforeSave contains slice of funcs that runs before save
+	BeforeSave []func(context.Context, Config) error
+	// AfterLoad contains slice of funcs that runs after load
+	AfterLoad []func(context.Context, Config) error
+	// BeforeLoad contains slice of funcs that runs before load
+	BeforeLoad []func(context.Context, Config) error
+	// AfterSave contains slice of funcs that runs after save
+	AfterSave []func(context.Context, Config) error
+	// AllowFail flag to allow fail in config source
+	AllowFail bool
 }
 
+// Option function signature
 type Option func(o *Options)
 
+// NewOptions new options struct with filed values
 func NewOptions(opts ...Option) Options {
 	options := Options{
 		Logger:  logger.DefaultLogger,
@@ -48,36 +58,105 @@ func NewOptions(opts ...Option) Options {
 	return options
 }
 
+// LoadOption function signature
+type LoadOption func(o *LoadOptions)
+
+// LoadOptions struct
+type LoadOptions struct {
+	Struct   interface{}
+	Override bool
+	Append   bool
+}
+
+func NewLoadOptions(opts ...LoadOption) LoadOptions {
+	options := LoadOptions{}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}
+
+// LoadOverride override values when load
+func LoadOverride(b bool) LoadOption {
+	return func(o *LoadOptions) {
+		o.Override = b
+	}
+}
+
+// LoadAppend override values when load
+func LoadAppend(b bool) LoadOption {
+	return func(o *LoadOptions) {
+		o.Append = b
+	}
+}
+
+// LoadStruct override struct for loading
+func LoadStruct(src interface{}) LoadOption {
+	return func(o *LoadOptions) {
+		o.Struct = src
+	}
+}
+
+// SaveOption function signature
+type SaveOption func(o *SaveOptions)
+
+// SaveOptions struct
+type SaveOptions struct {
+	Struct interface{}
+}
+
+// SaveStruct override struct for save to config
+func SaveStruct(src interface{}) SaveOption {
+	return func(o *SaveOptions) {
+		o.Struct = src
+	}
+}
+
+// NewSaveOptions fill SaveOptions struct
+func NewSaveOptions(opts ...SaveOption) SaveOptions {
+	options := SaveOptions{}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}
+
+// AllowFail allows config source to fail
 func AllowFail(b bool) Option {
 	return func(o *Options) {
 		o.AllowFail = b
 	}
 }
 
+// BeforeLoad run funcs before config load
 func BeforeLoad(fn ...func(context.Context, Config) error) Option {
 	return func(o *Options) {
 		o.BeforeLoad = fn
 	}
 }
 
+// AfterLoad run funcs after config load
 func AfterLoad(fn ...func(context.Context, Config) error) Option {
 	return func(o *Options) {
 		o.AfterLoad = fn
 	}
 }
 
+// BeforeSave run funcs before save
 func BeforeSave(fn ...func(context.Context, Config) error) Option {
 	return func(o *Options) {
 		o.BeforeSave = fn
 	}
 }
 
+// AfterSave run fncs after save
 func AfterSave(fn ...func(context.Context, Config) error) Option {
 	return func(o *Options) {
 		o.AfterSave = fn
 	}
 }
 
+// Context pass context
 func Context(ctx context.Context) Option {
 	return func(o *Options) {
 		o.Context = ctx
@@ -91,6 +170,7 @@ func Codec(c codec.Codec) Option {
 	}
 }
 
+// Logger sets the logger
 func Logger(l logger.Logger) Option {
 	return func(o *Options) {
 		o.Logger = l
@@ -111,7 +191,7 @@ func Struct(v interface{}) Option {
 	}
 }
 
-// StructTag
+// StructTag sets the struct tag that used for filling
 func StructTag(name string) Option {
 	return func(o *Options) {
 		o.StructTag = name
@@ -124,3 +204,60 @@ func Name(n string) Option {
 		o.Name = n
 	}
 }
+
+// WatchOptions struuct
+type WatchOptions struct {
+	// Context used by non default options
+	Context context.Context
+	// Coalesce multiple events to one
+	Coalesce bool
+	// MinInterval specifies the min time.Duration interval for poll changes
+	MinInterval time.Duration
+	// MaxInterval specifies the max time.Duration interval for poll changes
+	MaxInterval time.Duration
+	// Struct for filling
+	Struct interface{}
+}
+
+type WatchOption func(*WatchOptions)
+
+func NewWatchOptions(opts ...WatchOption) WatchOptions {
+	options := WatchOptions{
+		Context:     context.Background(),
+		MinInterval: DefaultWatcherMinInterval,
+		MaxInterval: DefaultWatcherMaxInterval,
+	}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}
+
+// WatchContext pass context
+func WatchContext(ctx context.Context) WatchOption {
+	return func(o *WatchOptions) {
+		o.Context = ctx
+	}
+}
+
+// WatchCoalesce controls watch event combining
+func WatchCoalesce(b bool) WatchOption {
+	return func(o *WatchOptions) {
+		o.Coalesce = b
+	}
+}
+
+// WatchInterval specifies min and max time.Duration for pulling changes
+func WatchInterval(min, max time.Duration) WatchOption {
+	return func(o *WatchOptions) {
+		o.MinInterval = min
+		o.MaxInterval = max
+	}
+}
+
+// WatchStruct overrides struct for fill
+func WatchStruct(src interface{}) WatchOption {
+	return func(o *WatchOptions) {
+		o.Struct = src
+	}
+}

config/reflect_test.go

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

debug/debug.go

@@ -1,2 +0,0 @@
-// Package debug provides interfaces for service debugging
-package debug

debug/log/kubernetes/kubernetes.go

@@ -1,190 +0,0 @@
-// Package kubernetes is a logger implementing (github.com/unistack-org/micro/v3/debug/log).Log
-package kubernetes
-
-import (
-	"bufio"
-	"encoding/json"
-	"fmt"
-	"os"
-	"sort"
-	"strconv"
-	"time"
-
-	"github.com/unistack-org/micro/v3/debug/log"
-	"github.com/unistack-org/micro/v3/metadata"
-	"github.com/unistack-org/micro/v3/util/kubernetes/client"
-)
-
-type klog struct {
-	client client.Client
-
-	log.Options
-}
-
-func (k *klog) podLogStream(podName string, stream *kubeStream) {
-	p := make(map[string]string)
-	p["follow"] = "true"
-
-	// get the logs for the pod
-	body, err := k.client.Log(&client.Resource{
-		Name: podName,
-		Kind: "pod",
-	}, client.LogParams(p))
-
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "%v", err)
-		return
-	}
-
-	s := bufio.NewScanner(body)
-	defer body.Close()
-
-	for {
-		select {
-		case <-stream.stop:
-			return
-		default:
-			if s.Scan() {
-				record := k.parse(s.Text())
-				stream.stream <- record
-			} else {
-				// TODO: is there a blocking call
-				// rather than a sleep loop?
-				time.Sleep(time.Second)
-			}
-		}
-	}
-}
-
-func (k *klog) getMatchingPods() ([]string, error) {
-	r := &client.Resource{
-		Kind:  "pod",
-		Value: new(client.PodList),
-	}
-
-	l := make(map[string]string)
-
-	l["name"] = client.Format(k.Options.Name)
-	// TODO: specify micro:service
-	// l["micro"] = "service"
-
-	if err := k.client.Get(r, client.GetLabels(l)); err != nil {
-		return nil, err
-	}
-
-	var matches []string
-
-	for _, p := range r.Value.(*client.PodList).Items {
-		// find labels that match the name
-		if p.Metadata.Labels["name"] == client.Format(k.Options.Name) {
-			matches = append(matches, p.Metadata.Name)
-		}
-	}
-
-	return matches, nil
-}
-
-func (k *klog) parse(line string) log.Record {
-	record := log.Record{}
-
-	if err := json.Unmarshal([]byte(line), &record); err != nil {
-		record.Timestamp = time.Now().UTC()
-		record.Message = line
-		record.Metadata = metadata.New(1)
-	}
-
-	record.Metadata["service"] = k.Options.Name
-
-	return record
-}
-
-func (k *klog) Read(options ...log.ReadOption) ([]log.Record, error) {
-	opts := &log.ReadOptions{}
-	for _, o := range options {
-		o(opts)
-	}
-	pods, err := k.getMatchingPods()
-	if err != nil {
-		return nil, err
-	}
-
-	var records []log.Record
-
-	for _, pod := range pods {
-		logParams := make(map[string]string)
-
-		if !opts.Since.Equal(time.Time{}) {
-			logParams["sinceSeconds"] = strconv.Itoa(int(time.Since(opts.Since).Seconds()))
-		}
-
-		if opts.Count != 0 {
-			logParams["tailLines"] = strconv.Itoa(opts.Count)
-		}
-
-		if opts.Stream {
-			logParams["follow"] = "true"
-		}
-
-		logs, err := k.client.Log(&client.Resource{
-			Name: pod,
-			Kind: "pod",
-		}, client.LogParams(logParams))
-
-		if err != nil {
-			return nil, err
-		}
-		defer logs.Close()
-
-		s := bufio.NewScanner(logs)
-
-		for s.Scan() {
-			record := k.parse(s.Text())
-			record.Metadata["pod"] = pod
-			records = append(records, record)
-		}
-	}
-
-	// sort the records
-	sort.Slice(records, func(i, j int) bool { return records[i].Timestamp.Before(records[j].Timestamp) })
-
-	return records, nil
-}
-
-func (k *klog) Write(l log.Record) error {
-	return write(l)
-}
-
-func (k *klog) Stream() (log.Stream, error) {
-	// find the matching pods
-	pods, err := k.getMatchingPods()
-	if err != nil {
-		return nil, err
-	}
-
-	stream := &kubeStream{
-		stream: make(chan log.Record),
-		stop:   make(chan bool),
-	}
-
-	// stream from the individual pods
-	for _, pod := range pods {
-		go k.podLogStream(pod, stream)
-	}
-
-	return stream, nil
-}
-
-// NewLog returns a configured Kubernetes logger
-func NewLog(opts ...log.Option) log.Log {
-	klog := &klog{}
-	for _, o := range opts {
-		o(&klog.Options)
-	}
-
-	if len(os.Getenv("KUBERNETES_SERVICE_HOST")) > 0 {
-		klog.client = client.NewClusterClient()
-	} else {
-		klog.client = client.NewLocalClient()
-	}
-	return klog
-}

debug/log/kubernetes/kubernetes_test.go

@@ -1,71 +0,0 @@
-package kubernetes
-
-import (
-	"bytes"
-	"encoding/json"
-	"io"
-	"os"
-	"testing"
-	"time"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/unistack-org/micro/v3/debug/log"
-)
-
-func TestKubernetes(t *testing.T) {
-	if len(os.Getenv("INTEGRATION_TESTS")) > 0 {
-		t.Skip()
-	}
-
-	k := NewLog(log.Name("micro-network"))
-
-	r, w, err := os.Pipe()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	s := os.Stderr
-	os.Stderr = w
-	meta := make(map[string]string)
-
-	write := log.Record{
-		Timestamp: time.Unix(0, 0).UTC(),
-		Message:   "Test log entry",
-		Metadata:  meta,
-	}
-
-	meta["foo"] = "bar"
-
-	k.Write(write)
-	b := &bytes.Buffer{}
-	w.Close()
-	io.Copy(b, r)
-	os.Stderr = s
-
-	var read log.Record
-
-	if err := json.Unmarshal(b.Bytes(), &read); err != nil {
-		t.Fatalf("json.Unmarshal failed: %s", err.Error())
-	}
-
-	assert.Equal(t, write, read, "Write was not equal")
-
-	records, err := k.Read()
-	assert.Nil(t, err, "Read should not error")
-	assert.NotNil(t, records, "Read should return records")
-
-	stream, err := k.Stream()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	records = nil
-
-	go stream.Stop()
-
-	for s := range stream.Chan() {
-		records = append(records, s)
-	}
-
-	assert.Equal(t, 0, len(records), "Stream should return nothing")
-}

debug/log/kubernetes/stream.go

@@ -1,44 +0,0 @@
-package kubernetes
-
-import (
-	"encoding/json"
-	"fmt"
-	"os"
-	"sync"
-
-	"github.com/unistack-org/micro/v3/debug/log"
-)
-
-func write(l log.Record) error {
-	m, err := json.Marshal(l)
-	if err == nil {
-		_, err := fmt.Fprintf(os.Stderr, "%s", m)
-		return err
-	}
-	return err
-}
-
-type kubeStream struct {
-	// the k8s log stream
-	stream chan log.Record
-	sync.Mutex
-	// the stop chan
-	stop chan bool
-}
-
-func (k *kubeStream) Chan() <-chan log.Record {
-	return k.stream
-}
-
-func (k *kubeStream) Stop() error {
-	k.Lock()
-	defer k.Unlock()
-	select {
-	case <-k.stop:
-		return nil
-	default:
-		close(k.stop)
-		close(k.stream)
-	}
-	return nil
-}

debug/log/log.go

@@ -1,58 +0,0 @@
-// Package log provides debug logging
-package log
-
-import (
-	"encoding/json"
-	"fmt"
-	"time"
-
-	"github.com/unistack-org/micro/v3/metadata"
-)
-
-var (
-	// Default buffer size if any
-	DefaultSize = 256
-	// Default formatter
-	DefaultFormat = TextFormat
-)
-
-// Log is debug log interface for reading and writing logs
-type Log interface {
-	// Read reads log entries from the logger
-	Read(...ReadOption) ([]Record, error)
-	// Write writes records to log
-	Write(Record) error
-	// Stream log records
-	Stream() (Stream, error)
-}
-
-// Record is log record entry
-type Record struct {
-	// Timestamp of logged event
-	Timestamp time.Time `json:"timestamp"`
-	// Metadata to enrich log record
-	Metadata metadata.Metadata `json:"metadata"`
-	// Value contains log entry
-	Message interface{} `json:"message"`
-}
-
-// Stream returns a log stream
-type Stream interface {
-	Chan() <-chan Record
-	Stop() error
-}
-
-// Format is a function which formats the output
-type FormatFunc func(Record) string
-
-// TextFormat returns text format
-func TextFormat(r Record) string {
-	t := r.Timestamp.Format("2006-01-02 15:04:05")
-	return fmt.Sprintf("%s %v", t, r.Message)
-}
-
-// JSONFormat is a json Format func
-func JSONFormat(r Record) string {
-	b, _ := json.Marshal(r)
-	return string(b)
-}

debug/log/memory/memory.go

@@ -1,115 +0,0 @@
-// Package memory provides an in memory log buffer
-package memory
-
-import (
-	"fmt"
-
-	"github.com/unistack-org/micro/v3/debug/log"
-	"github.com/unistack-org/micro/v3/metadata"
-	"github.com/unistack-org/micro/v3/util/ring"
-)
-
-// memoryLog is default micro log
-type memoryLog struct {
-	*ring.Buffer
-}
-
-// NewLog returns default Logger with
-func NewLog(opts ...log.Option) log.Log {
-	// get default options
-	options := log.DefaultOptions()
-
-	// apply requested options
-	for _, o := range opts {
-		o(&options)
-	}
-
-	return &memoryLog{
-		Buffer: ring.New(options.Size),
-	}
-}
-
-// Write writes logs into logger
-func (l *memoryLog) Write(r log.Record) error {
-	l.Buffer.Put(fmt.Sprint(r.Message))
-	return nil
-}
-
-// Read reads logs and returns them
-func (l *memoryLog) Read(opts ...log.ReadOption) ([]log.Record, error) {
-	options := log.ReadOptions{}
-	// initialize the read options
-	for _, o := range opts {
-		o(&options)
-	}
-
-	var entries []*ring.Entry
-	// if Since options ha sbeen specified we honor it
-	if !options.Since.IsZero() {
-		entries = l.Buffer.Since(options.Since)
-	}
-
-	// only if we specified valid count constraint
-	// do we end up doing some serious if-else kung-fu
-	// if since constraint has been provided
-	// we return *count* number of logs since the given timestamp;
-	// otherwise we return last count number of logs
-	if options.Count > 0 {
-		switch len(entries) > 0 {
-		case true:
-			// if we request fewer logs than what since constraint gives us
-			if options.Count < len(entries) {
-				entries = entries[0:options.Count]
-			}
-		default:
-			entries = l.Buffer.Get(options.Count)
-		}
-	}
-
-	records := make([]log.Record, 0, len(entries))
-	for _, entry := range entries {
-		record := log.Record{
-			Timestamp: entry.Timestamp,
-			Message:   entry.Value,
-		}
-		records = append(records, record)
-	}
-
-	return records, nil
-}
-
-// Stream returns channel for reading log records
-// along with a stop channel, close it when done
-func (l *memoryLog) Stream() (log.Stream, error) {
-	// get stream channel from ring buffer
-	stream, stop := l.Buffer.Stream()
-	// make a buffered channel
-	records := make(chan log.Record, 128)
-	// get last 10 records
-	last10 := l.Buffer.Get(10)
-
-	// stream the log records
-	go func() {
-		// first send last 10 records
-		for _, entry := range last10 {
-			records <- log.Record{
-				Timestamp: entry.Timestamp,
-				Message:   entry.Value,
-				Metadata:  metadata.New(0),
-			}
-		}
-		// now stream continuously
-		for entry := range stream {
-			records <- log.Record{
-				Timestamp: entry.Timestamp,
-				Message:   entry.Value,
-				Metadata:  metadata.New(0),
-			}
-		}
-	}()
-
-	return &logStream{
-		stream: records,
-		stop:   stop,
-	}, nil
-}

debug/log/memory/memory_test.go

@@ -1,32 +0,0 @@
-package memory
-
-import (
-	"reflect"
-	"testing"
-
-	"github.com/unistack-org/micro/v3/debug/log"
-)
-
-func TestLogger(t *testing.T) {
-	// set size to some value
-	size := 100
-	// override the global logger
-	lg := NewLog(log.Size(size))
-	// make sure we have the right size of the logger ring buffer
-	if lg.(*memoryLog).Size() != size {
-		t.Errorf("expected buffer size: %d, got: %d", size, lg.(*memoryLog).Size())
-	}
-
-	// Log some cruft
-	lg.Write(log.Record{Message: "foobar"})
-	lg.Write(log.Record{Message: "foo bar"})
-
-	// Check if the logs are stored in the logger ring buffer
-	expected := []string{"foobar", "foo bar"}
-	entries, _ := lg.Read(log.Count(len(expected)))
-	for i, entry := range entries {
-		if !reflect.DeepEqual(entry.Message, expected[i]) {
-			t.Errorf("expected %s, got %s", expected[i], entry.Message)
-		}
-	}
-}

debug/log/memory/stream.go

@@ -1,24 +0,0 @@
-package memory
-
-import (
-	"github.com/unistack-org/micro/v3/debug/log"
-)
-
-type logStream struct {
-	stream <-chan log.Record
-	stop   chan bool
-}
-
-func (l *logStream) Chan() <-chan log.Record {
-	return l.stream
-}
-
-func (l *logStream) Stop() error {
-	select {
-	case <-l.stop:
-		return nil
-	default:
-		close(l.stop)
-	}
-	return nil
-}

debug/log/noop/noop.go

@@ -1,23 +0,0 @@
-package noop
-
-import (
-	"github.com/unistack-org/micro/v3/debug/log"
-)
-
-type noop struct{}
-
-func (n *noop) Read(...log.ReadOption) ([]log.Record, error) {
-	return nil, nil
-}
-
-func (n *noop) Write(log.Record) error {
-	return nil
-}
-
-func (n *noop) Stream() (log.Stream, error) {
-	return nil, nil
-}
-
-func NewLog(opts ...log.Option) log.Log {
-	return new(noop)
-}

debug/log/options.go

@@ -1,70 +0,0 @@
-package log
-
-import "time"
-
-// Option used by the logger
-type Option func(*Options)
-
-// Options are logger options
-type Options struct {
-	// Name of the log
-	Name string
-	// Size is the size of ring buffer
-	Size int
-	// Format specifies the output format
-	Format FormatFunc
-}
-
-// Name of the log
-func Name(n string) Option {
-	return func(o *Options) {
-		o.Name = n
-	}
-}
-
-// Size sets the size of the ring buffer
-func Size(s int) Option {
-	return func(o *Options) {
-		o.Size = s
-	}
-}
-
-func Format(f FormatFunc) Option {
-	return func(o *Options) {
-		o.Format = f
-	}
-}
-
-// DefaultOptions returns default options
-func DefaultOptions() Options {
-	return Options{
-		Size: DefaultSize,
-	}
-}
-
-// ReadOptions for querying the logs
-type ReadOptions struct {
-	// Since what time in past to return the logs
-	Since time.Time
-	// Count specifies number of logs to return
-	Count int
-	// Stream requests continuous log stream
-	Stream bool
-}
-
-// ReadOption used for reading the logs
-type ReadOption func(*ReadOptions)
-
-// Since sets the time since which to return the log records
-func Since(s time.Time) ReadOption {
-	return func(o *ReadOptions) {
-		o.Since = s
-	}
-}
-
-// Count sets the number of log records to return
-func Count(c int) ReadOption {
-	return func(o *ReadOptions) {
-		o.Count = c
-	}
-}

debug/stats/memory/memory.go

@@ -1,89 +0,0 @@
-package stats
-
-import (
-	"runtime"
-	"sync"
-	"time"
-
-	"github.com/unistack-org/micro/v3/debug/stats"
-	"github.com/unistack-org/micro/v3/util/ring"
-)
-
-type memoryStats struct {
-	// used to store past stats
-	buffer *ring.Buffer
-
-	sync.RWMutex
-	started  int64
-	requests uint64
-	errors   uint64
-}
-
-func (s *memoryStats) snapshot() *stats.Stat {
-	s.RLock()
-	defer s.RUnlock()
-
-	var mstat runtime.MemStats
-	runtime.ReadMemStats(&mstat)
-
-	now := time.Now().Unix()
-
-	return &stats.Stat{
-		Timestamp: now,
-		Started:   s.started,
-		Uptime:    now - s.started,
-		Memory:    mstat.Alloc,
-		GC:        mstat.PauseTotalNs,
-		Threads:   uint64(runtime.NumGoroutine()),
-		Requests:  s.requests,
-		Errors:    s.errors,
-	}
-}
-
-func (s *memoryStats) Read() ([]*stats.Stat, error) {
-	buf := s.buffer.Get(s.buffer.Size())
-	var buffer []*stats.Stat
-
-	// get a value from the buffer if it exists
-	for _, b := range buf {
-		stat, ok := b.Value.(*stats.Stat)
-		if !ok {
-			continue
-		}
-		buffer = append(buffer, stat)
-	}
-
-	// get a snapshot
-	buffer = append(buffer, s.snapshot())
-
-	return buffer, nil
-}
-
-func (s *memoryStats) Write(stat *stats.Stat) error {
-	s.buffer.Put(stat)
-	return nil
-}
-
-func (s *memoryStats) Record(err error) error {
-	s.Lock()
-	defer s.Unlock()
-
-	// increment the total request count
-	s.requests++
-
-	// increment the error count
-	if err != nil {
-		s.errors++
-	}
-
-	return nil
-}
-
-// NewStats returns a new in memory stats buffer
-// TODO add options
-func NewStats() stats.Stats {
-	return &memoryStats{
-		started: time.Now().Unix(),
-		buffer:  ring.New(1),
-	}
-}

debug/stats/stats.go

@@ -1,32 +0,0 @@
-// Package stats provides runtime stats
-package stats
-
-// Stats provides stats interface
-type Stats interface {
-	// Read stat snapshot
-	Read() ([]*Stat, error)
-	// Write a stat snapshot
-	Write(*Stat) error
-	// Record a request
-	Record(error) error
-}
-
-// A runtime stat
-type Stat struct {
-	// Timestamp of recording
-	Timestamp int64
-	// Start time as unix timestamp
-	Started int64
-	// Uptime in seconds
-	Uptime int64
-	// Memory usage in bytes
-	Memory uint64
-	// Threads aka go routines
-	Threads uint64
-	// Garbage collection in nanoseconds
-	GC uint64
-	// Total requests
-	Requests uint64
-	// Total errors
-	Errors uint64
-}

errors/errors.go

@@ -9,46 +9,51 @@ import (
 )
 
 var (
-	// ErrBadRequest
+	// ErrBadRequest returns then requests contains invalid data
 	ErrBadRequest = &Error{Code: 400}
-	// ErrUnauthorized
+	// ErrUnauthorized returns then user have unauthorized call
 	ErrUnauthorized = &Error{Code: 401}
-	// ErrForbidden
+	// ErrForbidden returns then user have not access the resource
 	ErrForbidden = &Error{Code: 403}
-	// ErrNotFound
+	// ErrNotFound returns then user specify invalid endpoint
 	ErrNotFound = &Error{Code: 404}
-	// ErrMethodNotAllowed
+	// ErrMethodNotAllowed returns then user try to get invalid method
 	ErrMethodNotAllowed = &Error{Code: 405}
-	// ErrTimeout
+	// ErrTimeout returns then timeout exceeded
 	ErrTimeout = &Error{Code: 408}
-	// ErrConflict
+	// ErrConflict returns then request create duplicate resource
 	ErrConflict = &Error{Code: 409}
-	// ErrInternalServerError
+	// ErrInternalServerError returns then server cant process request because of internal error
 	ErrInternalServerError = &Error{Code: 500}
-	// ErNotImplemented
+	// ErNotImplemented returns then server does not have desired endpoint method
 	ErNotImplemented = &Error{Code: 501}
-	// ErrBadGateway
+	// ErrBadGateway returns then server cant process request
 	ErrBadGateway = &Error{Code: 502}
-	// ErrServiceUnavailable
+	// ErrServiceUnavailable returns then service unavailable
 	ErrServiceUnavailable = &Error{Code: 503}
-	// ErrGatewayTimeout
+	// ErrGatewayTimeout returns then server have long time to process request
 	ErrGatewayTimeout = &Error{Code: 504}
 )
 
-// Error tpye
+// Error type
 type Error struct {
-	Id     string
-	Code   int32
+	// Id holds error id or service, usually someting like my_service or id
+	Id string
+	// Detail holds some useful details about error
 	Detail string
+	// Status usually holds text of http status
 	Status string
+	// Code holds error code
+	Code int32
 }
 
+// Error satisfies error interface
 func (e *Error) Error() string {
 	b, _ := json.Marshal(e)
 	return string(b)
 }
 
-// New generates a custom error.
+// New generates a custom error
 func New(id, detail string, code int32) error {
 	return &Error{
 		Id:     id,

errors/errors_test.go

@@ -17,7 +17,6 @@ func TestFromError(t *testing.T) {
 	if merr.Id != "go.micro.test" || merr.Code != 404 {
 		t.Fatalf("invalid conversation %v != %v", err, merr)
 	}
-
 }
 
 func TestEqual(t *testing.T) {
@@ -32,7 +31,6 @@ func TestEqual(t *testing.T) {
 	if Equal(err1, err3) {
 		t.Fatal("errors must be not equal")
 	}
-
 }
 
 func TestErrors(t *testing.T) {

events/events.go

@@ -1,49 +0,0 @@
-// Package events contains interfaces for managing events within distributed systems
-package events
-
-import (
-	"context"
-	"encoding/json"
-	"errors"
-	"time"
-
-	"github.com/unistack-org/micro/v3/metadata"
-)
-
-var (
-	// ErrMissingTopic is returned if a blank topic was provided to publish
-	ErrMissingTopic = errors.New("Missing topic")
-	// ErrEncodingMessage is returned from publish if there was an error encoding the message option
-	ErrEncodingMessage = errors.New("Error encoding message")
-)
-
-// Stream of events
-type Stream interface {
-	Publish(ctx context.Context, topic string, msg interface{}, opts ...PublishOption) error
-	Subscribe(ctx context.Context, topic string, opts ...SubscribeOption) (<-chan Event, error)
-}
-
-// Store of events
-type Store interface {
-	Read(ctx context.Context, opts ...ReadOption) ([]*Event, error)
-	Write(ctx context.Context, event *Event, opts ...WriteOption) error
-}
-
-// Event is the object returned by the broker when you subscribe to a topic
-type Event struct {
-	// ID to uniquely identify the event
-	ID string
-	// Topic of event, e.g. "register.service.created"
-	Topic string
-	// Timestamp of the event
-	Timestamp time.Time
-	// Metadata contains the encoded event was indexed by
-	Metadata metadata.Metadata
-	// Payload contains the encoded message
-	Payload []byte
-}
-
-// Unmarshal the events message into an object
-func (e *Event) Unmarshal(v interface{}) error {
-	return json.Unmarshal(e.Payload, v)
-}

events/options.go

@@ -1,124 +0,0 @@
-package events
-
-import (
-	"time"
-
-	"github.com/unistack-org/micro/v3/metadata"
-)
-
-// PublishOptions contains all the options which can be provided when publishing an event
-type PublishOptions struct {
-	// Metadata contains any keys which can be used to query the data, for example a customer id
-	Metadata metadata.Metadata
-	// Timestamp to set for the event, if the timestamp is a zero value, the current time will be used
-	Timestamp time.Time
-}
-
-// PublishOption sets attributes on PublishOptions
-type PublishOption func(o *PublishOptions)
-
-// WithMetadata sets the Metadata field on PublishOptions
-func WithMetadata(md metadata.Metadata) PublishOption {
-	return func(o *PublishOptions) {
-		o.Metadata = metadata.Copy(md)
-	}
-}
-
-// WithTimestamp sets the timestamp field on PublishOptions
-func WithTimestamp(t time.Time) PublishOption {
-	return func(o *PublishOptions) {
-		o.Timestamp = t
-	}
-}
-
-// SubscribeOptions contains all the options which can be provided when subscribing to a topic
-type SubscribeOptions struct {
-	// Queue is the name of the subscribers queue, if two subscribers have the same queue the message
-	// should only be published to one of them
-	Queue string
-	// StartAtTime is the time from which the messages should be consumed from. If not provided then
-	// the messages will be consumed starting from the moment the Subscription starts.
-	StartAtTime time.Time
-}
-
-// SubscribeOption sets attributes on SubscribeOptions
-type SubscribeOption func(o *SubscribeOptions)
-
-// WithQueue sets the Queue fielf on SubscribeOptions to the value provided
-func WithQueue(q string) SubscribeOption {
-	return func(o *SubscribeOptions) {
-		o.Queue = q
-	}
-}
-
-// WithStartAtTime sets the StartAtTime field on SubscribeOptions to the value provided
-func WithStartAtTime(t time.Time) SubscribeOption {
-	return func(o *SubscribeOptions) {
-		o.StartAtTime = t
-	}
-}
-
-// WriteOptions contains all the options which can be provided when writing an event to a store
-type WriteOptions struct {
-	// TTL is the duration the event should be recorded for, a zero value TTL indicates the event should
-	// be stored indefinitely
-	TTL time.Duration
-}
-
-// WriteOption sets attributes on WriteOptions
-type WriteOption func(o *WriteOptions)
-
-// WithTTL sets the TTL attribute on WriteOptions
-func WithTTL(d time.Duration) WriteOption {
-	return func(o *WriteOptions) {
-		o.TTL = d
-	}
-}
-
-// ReadOptions contains all the options which can be provided when reading events from a store
-type ReadOptions struct {
-	// Topic to read events from, if no topic is provided events from all topics will be returned
-	Topic string
-	// Query to filter the results using. The store will query the metadata provided when the event
-	// was written to the store
-	Query map[string]string
-	// Limit the number of results to return
-	Limit int
-	// Offset the results by this number, useful for paginated queries
-	Offset int
-}
-
-// ReadOption sets attributes on ReadOptions
-type ReadOption func(o *ReadOptions)
-
-// ReadTopic sets the topic attribute on ReadOptions
-func ReadTopic(t string) ReadOption {
-	return func(o *ReadOptions) {
-		o.Topic = t
-	}
-}
-
-// ReadFilter sets a key and value in the query
-func ReadFilter(key, value string) ReadOption {
-	return func(o *ReadOptions) {
-		if o.Query == nil {
-			o.Query = map[string]string{key: value}
-		} else {
-			o.Query[key] = value
-		}
-	}
-}
-
-// ReadLimit sets the limit attribute on ReadOptions
-func ReadLimit(l int) ReadOption {
-	return func(o *ReadOptions) {
-		o.Limit = 1
-	}
-}
-
-// ReadOffset sets the offset attribute on ReadOptions
-func ReadOffset(l int) ReadOption {
-	return func(o *ReadOptions) {
-		o.Offset = 1
-	}
-}

flow/context.go

@@ -0,0 +1,34 @@
+package flow
+
+import (
+	"context"
+)
+
+type flowKey struct{}
+
+// FromContext returns Flow from context
+func FromContext(ctx context.Context) (Flow, bool) {
+	if ctx == nil {
+		return nil, false
+	}
+	c, ok := ctx.Value(flowKey{}).(Flow)
+	return c, ok
+}
+
+// NewContext stores Flow to context
+func NewContext(ctx context.Context, f Flow) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	return context.WithValue(ctx, flowKey{}, f)
+}
+
+// SetOption returns a function to setup a context with given value
+func SetOption(k, v interface{}) Option {
+	return func(o *Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}

flow/dag.go

@@ -0,0 +1,21 @@
+package flow
+
+type node struct {
+	name string
+}
+
+func (n *node) ID() string {
+	return n.name
+}
+
+func (n *node) Name() string {
+	return n.name
+}
+
+func (n *node) String() string {
+	return n.name
+}
+
+func (n *node) Hashcode() interface{} {
+	return n.name
+}

flow/dag_test.go

@@ -0,0 +1,68 @@
+package flow
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/silas/dag"
+)
+
+func checkErr(t *testing.T, err error) {
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestDag(t *testing.T) {
+	d1 := &dag.AcyclicGraph{}
+	d2 := &dag.AcyclicGraph{}
+	d2v1 := d2.Add(&node{"Substep.Create"})
+	v1 := d1.Add(&node{"AccountService.Create"})
+	v2 := d1.Add(&node{"AuthzService.Create"})
+	v3 := d1.Add(&node{"AuthnService.Create"})
+	v4 := d1.Add(&node{"ProjectService.Create"})
+	v5 := d1.Add(&node{"ContactService.Create"})
+	v6 := d1.Add(&node{"NetworkService.Create"})
+	v7 := d1.Add(&node{"MailerService.Create"})
+	v8 := d1.Add(&node{"NestedService.Create"})
+	v9 := d1.Add(d2v1)
+	d1.Connect(dag.BasicEdge(v1, v2))
+	d1.Connect(dag.BasicEdge(v1, v3))
+	d1.Connect(dag.BasicEdge(v1, v4))
+	d1.Connect(dag.BasicEdge(v1, v5))
+	d1.Connect(dag.BasicEdge(v1, v6))
+	d1.Connect(dag.BasicEdge(v1, v7))
+	d1.Connect(dag.BasicEdge(v7, v8))
+	d1.Connect(dag.BasicEdge(v8, v9))
+
+	if err := d1.Validate(); err != nil {
+		t.Fatal(err)
+	}
+
+	d1.TransitiveReduction()
+
+	var steps [][]string
+	fn := func(n dag.Vertex, idx int) error {
+		if idx == 0 {
+			steps = make([][]string, 1)
+			steps[0] = make([]string, 0, 1)
+		} else if idx >= len(steps) {
+			tsteps := make([][]string, idx+1)
+			copy(tsteps, steps)
+			steps = tsteps
+			steps[idx] = make([]string, 0, 1)
+		}
+		steps[idx] = append(steps[idx], fmt.Sprintf("%s", n))
+		return nil
+	}
+
+	start := &node{"AccountService.Create"}
+	err := d1.SortedDepthFirstWalk([]dag.Vertex{start}, fn)
+	checkErr(t, err)
+	if len(steps) != 4 {
+		t.Fatalf("invalid steps: %#+v", steps)
+	}
+	if steps[3][0] != "Substep.Create" {
+		t.Fatalf("invalid last step: %#+v", steps)
+	}
+}

flow/default.go

@@ -0,0 +1,584 @@
+package flow
+
+import (
+	"context"
+	"fmt"
+	"path/filepath"
+	"sync"
+
+	"github.com/silas/dag"
+	"github.com/unistack-org/micro/v3/client"
+	"github.com/unistack-org/micro/v3/codec"
+	"github.com/unistack-org/micro/v3/logger"
+	"github.com/unistack-org/micro/v3/metadata"
+	"github.com/unistack-org/micro/v3/store"
+	"github.com/unistack-org/micro/v3/util/id"
+)
+
+type microFlow struct {
+	opts Options
+}
+
+type microWorkflow struct {
+	opts   Options
+	g      *dag.AcyclicGraph
+	steps  map[string]Step
+	id     string
+	status Status
+	sync.RWMutex
+	init bool
+}
+
+func (w *microWorkflow) ID() string {
+	return w.id
+}
+
+func (w *microWorkflow) Steps() ([][]Step, error) {
+	return w.getSteps("", false)
+}
+
+func (w *microWorkflow) Status() Status {
+	return w.status
+}
+
+func (w *microWorkflow) AppendSteps(steps ...Step) error {
+	w.Lock()
+
+	for _, s := range steps {
+		w.steps[s.String()] = s
+		w.g.Add(s)
+	}
+
+	for _, dst := range steps {
+		for _, req := range dst.Requires() {
+			src, ok := w.steps[req]
+			if !ok {
+				return ErrStepNotExists
+			}
+			w.g.Connect(dag.BasicEdge(src, dst))
+		}
+	}
+
+	if err := w.g.Validate(); err != nil {
+		w.Unlock()
+		return err
+	}
+
+	w.g.TransitiveReduction()
+
+	w.Unlock()
+
+	return nil
+}
+
+func (w *microWorkflow) RemoveSteps(steps ...Step) error {
+	// TODO: handle case when some step requires or required by removed step
+
+	w.Lock()
+
+	for _, s := range steps {
+		delete(w.steps, s.String())
+		w.g.Remove(s)
+	}
+
+	for _, dst := range steps {
+		for _, req := range dst.Requires() {
+			src, ok := w.steps[req]
+			if !ok {
+				return ErrStepNotExists
+			}
+			w.g.Connect(dag.BasicEdge(src, dst))
+		}
+	}
+
+	if err := w.g.Validate(); err != nil {
+		w.Unlock()
+		return err
+	}
+
+	w.g.TransitiveReduction()
+
+	w.Unlock()
+
+	return nil
+}
+
+func (w *microWorkflow) getSteps(start string, reverse bool) ([][]Step, error) {
+	var steps [][]Step
+	var root dag.Vertex
+	var err error
+
+	fn := func(n dag.Vertex, idx int) error {
+		if idx == 0 {
+			steps = make([][]Step, 1)
+			steps[0] = make([]Step, 0, 1)
+		} else if idx >= len(steps) {
+			tsteps := make([][]Step, idx+1)
+			copy(tsteps, steps)
+			steps = tsteps
+			steps[idx] = make([]Step, 0, 1)
+		}
+		steps[idx] = append(steps[idx], n.(Step))
+		return nil
+	}
+
+	if start != "" {
+		var ok bool
+		w.RLock()
+		root, ok = w.steps[start]
+		w.RUnlock()
+		if !ok {
+			return nil, ErrStepNotExists
+		}
+	} else {
+		root, err = w.g.Root()
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if reverse {
+		err = w.g.SortedReverseDepthFirstWalk([]dag.Vertex{root}, fn)
+	} else {
+		err = w.g.SortedDepthFirstWalk([]dag.Vertex{root}, fn)
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	return steps, nil
+}
+
+func (w *microWorkflow) Abort(ctx context.Context, id string) error {
+	workflowStore := store.NewNamespaceStore(w.opts.Store, filepath.Join("workflows", id))
+	return workflowStore.Write(ctx, "status", &codec.Frame{Data: []byte(StatusAborted.String())})
+}
+
+func (w *microWorkflow) Suspend(ctx context.Context, id string) error {
+	workflowStore := store.NewNamespaceStore(w.opts.Store, filepath.Join("workflows", id))
+	return workflowStore.Write(ctx, "status", &codec.Frame{Data: []byte(StatusSuspend.String())})
+}
+
+func (w *microWorkflow) Resume(ctx context.Context, id string) error {
+	workflowStore := store.NewNamespaceStore(w.opts.Store, filepath.Join("workflows", id))
+	return workflowStore.Write(ctx, "status", &codec.Frame{Data: []byte(StatusRunning.String())})
+}
+
+func (w *microWorkflow) Execute(ctx context.Context, req *Message, opts ...ExecuteOption) (string, error) {
+	w.Lock()
+	if !w.init {
+		if err := w.g.Validate(); err != nil {
+			w.Unlock()
+			return "", err
+		}
+		w.g.TransitiveReduction()
+		w.init = true
+	}
+	w.Unlock()
+
+	eid, err := id.New()
+	if err != nil {
+		return "", err
+	}
+
+	stepStore := store.NewNamespaceStore(w.opts.Store, filepath.Join("steps", eid))
+	workflowStore := store.NewNamespaceStore(w.opts.Store, filepath.Join("workflows", eid))
+
+	options := NewExecuteOptions(opts...)
+
+	steps, err := w.getSteps(options.Start, options.Reverse)
+	if err != nil {
+		if werr := workflowStore.Write(w.opts.Context, "status", &codec.Frame{Data: []byte(StatusPending.String())}); werr != nil {
+			w.opts.Logger.Errorf(w.opts.Context, "store error: %v", werr)
+		}
+		return "", err
+	}
+
+	var wg sync.WaitGroup
+	cherr := make(chan error, 1)
+	chstatus := make(chan Status, 1)
+
+	nctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+
+	nopts := make([]ExecuteOption, 0, len(opts)+5)
+
+	nopts = append(nopts,
+		ExecuteClient(w.opts.Client),
+		ExecuteTracer(w.opts.Tracer),
+		ExecuteLogger(w.opts.Logger),
+		ExecuteMeter(w.opts.Meter),
+	)
+	nopts = append(nopts, opts...)
+	done := make(chan struct{})
+
+	if werr := workflowStore.Write(w.opts.Context, "status", &codec.Frame{Data: []byte(StatusRunning.String())}); werr != nil {
+		w.opts.Logger.Errorf(w.opts.Context, "store error: %v", werr)
+		return eid, werr
+	}
+	for idx := range steps {
+		for nidx := range steps[idx] {
+			cstep := steps[idx][nidx]
+			if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "status"), &codec.Frame{Data: []byte(StatusPending.String())}); werr != nil {
+				return eid, werr
+			}
+		}
+	}
+
+	go func() {
+		for idx := range steps {
+			for nidx := range steps[idx] {
+				wStatus := &codec.Frame{}
+				if werr := workflowStore.Read(w.opts.Context, "status", wStatus); werr != nil {
+					cherr <- werr
+					return
+				}
+				if status := StringStatus[string(wStatus.Data)]; status != StatusRunning {
+					chstatus <- status
+					return
+				}
+				if w.opts.Logger.V(logger.TraceLevel) {
+					w.opts.Logger.Tracef(nctx, "will be executed %v", steps[idx][nidx])
+				}
+				cstep := steps[idx][nidx]
+				if len(cstep.Requires()) == 0 {
+					wg.Add(1)
+					go func(step Step) {
+						defer wg.Done()
+						if werr := stepStore.Write(ctx, filepath.Join(step.ID(), "req"), req); werr != nil {
+							cherr <- werr
+							return
+						}
+						if werr := stepStore.Write(ctx, filepath.Join(step.ID(), "status"), &codec.Frame{Data: []byte(StatusRunning.String())}); werr != nil {
+							cherr <- werr
+							return
+						}
+						rsp, serr := step.Execute(nctx, req, nopts...)
+						if serr != nil {
+							step.SetStatus(StatusFailure)
+							if werr := stepStore.Write(ctx, filepath.Join(step.ID(), "rsp"), serr); werr != nil && w.opts.Logger.V(logger.ErrorLevel) {
+								w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
+							}
+							if werr := stepStore.Write(ctx, filepath.Join(step.ID(), "status"), &codec.Frame{Data: []byte(StatusFailure.String())}); werr != nil && w.opts.Logger.V(logger.ErrorLevel) {
+								w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
+							}
+							cherr <- serr
+							return
+						}
+						if werr := stepStore.Write(ctx, filepath.Join(step.ID(), "rsp"), rsp); werr != nil {
+							w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
+							cherr <- werr
+							return
+						}
+						if werr := stepStore.Write(ctx, filepath.Join(step.ID(), "status"), &codec.Frame{Data: []byte(StatusSuccess.String())}); werr != nil {
+							w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
+							cherr <- werr
+							return
+						}
+					}(cstep)
+					wg.Wait()
+				} else {
+					if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "req"), req); werr != nil {
+						cherr <- werr
+						return
+					}
+					if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "status"), &codec.Frame{Data: []byte(StatusRunning.String())}); werr != nil {
+						cherr <- werr
+						return
+					}
+					rsp, serr := cstep.Execute(nctx, req, nopts...)
+					if serr != nil {
+						cstep.SetStatus(StatusFailure)
+						if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "rsp"), serr); werr != nil && w.opts.Logger.V(logger.ErrorLevel) {
+							w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
+						}
+						if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "status"), &codec.Frame{Data: []byte(StatusFailure.String())}); werr != nil && w.opts.Logger.V(logger.ErrorLevel) {
+							w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
+						}
+						cherr <- serr
+						return
+					}
+					if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "rsp"), rsp); werr != nil {
+						w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
+						cherr <- werr
+						return
+					}
+					if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "status"), &codec.Frame{Data: []byte(StatusSuccess.String())}); werr != nil {
+						cherr <- werr
+						return
+					}
+				}
+			}
+		}
+		close(done)
+	}()
+
+	if options.Async {
+		return eid, nil
+	}
+
+	logger.Tracef(ctx, "wait for finish or error")
+	select {
+	case <-nctx.Done():
+		err = nctx.Err()
+	case cerr := <-cherr:
+		err = cerr
+	case <-done:
+		close(cherr)
+	case <-chstatus:
+		close(chstatus)
+		return eid, nil
+	}
+
+	switch {
+	case nctx.Err() != nil:
+		if werr := workflowStore.Write(w.opts.Context, "status", &codec.Frame{Data: []byte(StatusAborted.String())}); werr != nil {
+			w.opts.Logger.Errorf(w.opts.Context, "store error: %v", werr)
+		}
+	case err == nil:
+		if werr := workflowStore.Write(w.opts.Context, "status", &codec.Frame{Data: []byte(StatusSuccess.String())}); werr != nil {
+			w.opts.Logger.Errorf(w.opts.Context, "store error: %v", werr)
+		}
+	case err != nil:
+		if werr := workflowStore.Write(w.opts.Context, "status", &codec.Frame{Data: []byte(StatusFailure.String())}); werr != nil {
+			w.opts.Logger.Errorf(w.opts.Context, "store error: %v", werr)
+		}
+	}
+
+	return eid, err
+}
+
+func NewFlow(opts ...Option) Flow {
+	options := NewOptions(opts...)
+	return &microFlow{opts: options}
+}
+
+func (f *microFlow) Options() Options {
+	return f.opts
+}
+
+func (f *microFlow) Init(opts ...Option) error {
+	for _, o := range opts {
+		o(&f.opts)
+	}
+	if err := f.opts.Client.Init(); err != nil {
+		return err
+	}
+	if err := f.opts.Tracer.Init(); err != nil {
+		return err
+	}
+	if err := f.opts.Logger.Init(); err != nil {
+		return err
+	}
+	if err := f.opts.Meter.Init(); err != nil {
+		return err
+	}
+	if err := f.opts.Store.Init(); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (f *microFlow) WorkflowList(ctx context.Context) ([]Workflow, error) {
+	return nil, nil
+}
+
+func (f *microFlow) WorkflowCreate(ctx context.Context, id string, steps ...Step) (Workflow, error) {
+	w := &microWorkflow{opts: f.opts, id: id, g: &dag.AcyclicGraph{}, steps: make(map[string]Step, len(steps))}
+
+	for _, s := range steps {
+		w.steps[s.String()] = s
+		w.g.Add(s)
+	}
+
+	for _, dst := range steps {
+		for _, req := range dst.Requires() {
+			src, ok := w.steps[req]
+			if !ok {
+				return nil, ErrStepNotExists
+			}
+			w.g.Connect(dag.BasicEdge(src, dst))
+		}
+	}
+
+	if err := w.g.Validate(); err != nil {
+		return nil, err
+	}
+	w.g.TransitiveReduction()
+
+	w.init = true
+
+	return w, nil
+}
+
+func (f *microFlow) WorkflowRemove(ctx context.Context, id string) error {
+	return nil
+}
+
+func (f *microFlow) WorkflowSave(ctx context.Context, w Workflow) error {
+	return nil
+}
+
+func (f *microFlow) WorkflowLoad(ctx context.Context, id string) (Workflow, error) {
+	return nil, nil
+}
+
+type microCallStep struct {
+	rsp     *Message
+	req     *Message
+	opts    StepOptions
+	service string
+	method  string
+	status  Status
+}
+
+func (s *microCallStep) Request() *Message {
+	return s.req
+}
+
+func (s *microCallStep) Response() *Message {
+	return s.rsp
+}
+
+func (s *microCallStep) ID() string {
+	return s.String()
+}
+
+func (s *microCallStep) Options() StepOptions {
+	return s.opts
+}
+
+func (s *microCallStep) Endpoint() string {
+	return s.method
+}
+
+func (s *microCallStep) Requires() []string {
+	return s.opts.Requires
+}
+
+func (s *microCallStep) Require(steps ...Step) error {
+	for _, step := range steps {
+		s.opts.Requires = append(s.opts.Requires, step.String())
+	}
+	return nil
+}
+
+func (s *microCallStep) String() string {
+	if s.opts.ID != "" {
+		return s.opts.ID
+	}
+	return fmt.Sprintf("%s.%s", s.service, s.method)
+}
+
+func (s *microCallStep) Name() string {
+	return s.String()
+}
+
+func (s *microCallStep) Hashcode() interface{} {
+	return s.String()
+}
+
+func (s *microCallStep) GetStatus() Status {
+	return s.status
+}
+
+func (s *microCallStep) SetStatus(status Status) {
+	s.status = status
+}
+
+func (s *microCallStep) Execute(ctx context.Context, req *Message, opts ...ExecuteOption) (*Message, error) {
+	options := NewExecuteOptions(opts...)
+	if options.Client == nil {
+		return nil, ErrMissingClient
+	}
+	rsp := &codec.Frame{}
+	copts := []client.CallOption{client.WithRetries(0)}
+	if options.Timeout > 0 {
+		copts = append(copts,
+			client.WithRequestTimeout(options.Timeout),
+			client.WithDialTimeout(options.Timeout))
+	}
+	nctx := metadata.NewOutgoingContext(ctx, req.Header)
+	err := options.Client.Call(nctx, options.Client.NewRequest(s.service, s.method, &codec.Frame{Data: req.Body}), rsp, copts...)
+	if err != nil {
+		return nil, err
+	}
+	md, _ := metadata.FromOutgoingContext(nctx)
+	return &Message{Header: md, Body: rsp.Data}, err
+}
+
+type microPublishStep struct {
+	req    *Message
+	rsp    *Message
+	opts   StepOptions
+	topic  string
+	status Status
+}
+
+func (s *microPublishStep) Request() *Message {
+	return s.req
+}
+
+func (s *microPublishStep) Response() *Message {
+	return s.rsp
+}
+
+func (s *microPublishStep) ID() string {
+	return s.String()
+}
+
+func (s *microPublishStep) Options() StepOptions {
+	return s.opts
+}
+
+func (s *microPublishStep) Endpoint() string {
+	return s.topic
+}
+
+func (s *microPublishStep) Requires() []string {
+	return s.opts.Requires
+}
+
+func (s *microPublishStep) Require(steps ...Step) error {
+	for _, step := range steps {
+		s.opts.Requires = append(s.opts.Requires, step.String())
+	}
+	return nil
+}
+
+func (s *microPublishStep) String() string {
+	if s.opts.ID != "" {
+		return s.opts.ID
+	}
+	return s.topic
+}
+
+func (s *microPublishStep) Name() string {
+	return s.String()
+}
+
+func (s *microPublishStep) Hashcode() interface{} {
+	return s.String()
+}
+
+func (s *microPublishStep) GetStatus() Status {
+	return s.status
+}
+
+func (s *microPublishStep) SetStatus(status Status) {
+	s.status = status
+}
+
+func (s *microPublishStep) Execute(ctx context.Context, req *Message, opts ...ExecuteOption) (*Message, error) {
+	return nil, nil
+}
+
+func NewCallStep(service string, name string, method string, opts ...StepOption) Step {
+	options := NewStepOptions(opts...)
+	return &microCallStep{service: service, method: name + "." + method, opts: options}
+}
+
+func NewPublishStep(topic string, opts ...StepOption) Step {
+	options := NewStepOptions(opts...)
+	return &microPublishStep{topic: topic, opts: options}
+}

flow/flow.go

@@ -0,0 +1,152 @@
+// Package flow is an interface used for saga pattern microservice workflow
+package flow
+
+import (
+	"context"
+	"errors"
+	"sync"
+	"sync/atomic"
+
+	"github.com/unistack-org/micro/v3/metadata"
+)
+
+var (
+	ErrStepNotExists = errors.New("step not exists")
+	ErrMissingClient = errors.New("client not set")
+)
+
+// RawMessage is a raw encoded JSON value.
+// It implements Marshaler and Unmarshaler and can be used to delay decoding or precompute a encoding.
+type RawMessage []byte
+
+// MarshalJSON returns m as the JSON encoding of m.
+func (m *RawMessage) MarshalJSON() ([]byte, error) {
+	if m == nil {
+		return []byte("null"), nil
+	}
+	return *m, nil
+}
+
+// UnmarshalJSON sets *m to a copy of data.
+func (m *RawMessage) UnmarshalJSON(data []byte) error {
+	if m == nil {
+		return errors.New("RawMessage UnmarshalJSON on nil pointer")
+	}
+	*m = append((*m)[0:0], data...)
+	return nil
+}
+
+type Message struct {
+	Header metadata.Metadata
+	Body   RawMessage
+}
+
+// Step represents dedicated workflow step
+type Step interface {
+	// ID returns step id
+	ID() string
+	// Endpoint returns rpc endpoint service_name.service_method or broker topic
+	Endpoint() string
+	// Execute step run
+	Execute(ctx context.Context, req *Message, opts ...ExecuteOption) (*Message, error)
+	// Requires returns dependent steps
+	Requires() []string
+	// Options returns step options
+	Options() StepOptions
+	// Require add required steps
+	Require(steps ...Step) error
+	// String
+	String() string
+	// GetStatus returns step status
+	GetStatus() Status
+	// SetStatus sets the step status
+	SetStatus(Status)
+	// Request returns step request message
+	Request() *Message
+	// Response returns step response message
+	Response() *Message
+}
+
+type Status int
+
+func (status Status) String() string {
+	return StatusString[status]
+}
+
+const (
+	StatusPending Status = iota
+	StatusRunning
+	StatusFailure
+	StatusSuccess
+	StatusAborted
+	StatusSuspend
+)
+
+var (
+	StatusString = map[Status]string{
+		StatusPending: "StatusPending",
+		StatusRunning: "StatusRunning",
+		StatusFailure: "StatusFailure",
+		StatusSuccess: "StatusSuccess",
+		StatusAborted: "StatusAborted",
+		StatusSuspend: "StatusSuspend",
+	}
+	StringStatus = map[string]Status{
+		"StatusPending": StatusPending,
+		"StatusRunning": StatusRunning,
+		"StatusFailure": StatusFailure,
+		"StatusSuccess": StatusSuccess,
+		"StatusAborted": StatusAborted,
+		"StatusSuspend": StatusSuspend,
+	}
+)
+
+// Workflow contains all steps to execute
+type Workflow interface {
+	// ID returns id of the workflow
+	ID() string
+	// Execute workflow with args, return execution id and error
+	Execute(ctx context.Context, req *Message, opts ...ExecuteOption) (string, error)
+	// RemoveSteps remove steps from workflow
+	RemoveSteps(steps ...Step) error
+	// AppendSteps append steps to workflow
+	AppendSteps(steps ...Step) error
+	// Status returns workflow status
+	Status() Status
+	// Steps returns steps slice where parallel steps returned on the same level
+	Steps() ([][]Step, error)
+	// Suspend suspends execution
+	Suspend(ctx context.Context, id string) error
+	// Resume resumes execution
+	Resume(ctx context.Context, id string) error
+	// Abort abort execution
+	Abort(ctx context.Context, id string) error
+}
+
+// Flow the base interface to interact with workflows
+type Flow interface {
+	// Options returns options
+	Options() Options
+	// Init initialize
+	Init(...Option) error
+	// WorkflowCreate creates new workflow with specific id and steps
+	WorkflowCreate(ctx context.Context, id string, steps ...Step) (Workflow, error)
+	// WorkflowSave saves workflow
+	WorkflowSave(ctx context.Context, w Workflow) error
+	// WorkflowLoad loads workflow with specific id
+	WorkflowLoad(ctx context.Context, id string) (Workflow, error)
+	// WorkflowList lists all workflows
+	WorkflowList(ctx context.Context) ([]Workflow, error)
+}
+
+var (
+	flowMu      sync.Mutex
+	atomicSteps atomic.Value
+)
+
+func RegisterStep(step Step) {
+	flowMu.Lock()
+	steps, _ := atomicSteps.Load().([]Step)
+	atomicSteps.Store(append(steps, step))
+	flowMu.Unlock()
+}

flow/options.go

@@ -0,0 +1,230 @@
+package flow
+
+import (
+	"context"
+	"time"
+
+	"github.com/unistack-org/micro/v3/client"
+	"github.com/unistack-org/micro/v3/logger"
+	"github.com/unistack-org/micro/v3/meter"
+	"github.com/unistack-org/micro/v3/store"
+	"github.com/unistack-org/micro/v3/tracer"
+)
+
+// Option func
+type Option func(*Options)
+
+// Options server struct
+type Options struct {
+	// Context holds the external options and can be used for flow shutdown
+	Context context.Context
+	// Client holds the client.Client
+	Client client.Client
+	// Tracer holds the tracer
+	Tracer tracer.Tracer
+	// Logger holds the logger
+	Logger logger.Logger
+	// Meter holds the meter
+	Meter meter.Meter
+	// Store used for intermediate results
+	Store store.Store
+}
+
+// NewOptions returns new options struct with default or passed values
+func NewOptions(opts ...Option) Options {
+	options := Options{
+		Context: context.Background(),
+		Logger:  logger.DefaultLogger,
+		Meter:   meter.DefaultMeter,
+		Tracer:  tracer.DefaultTracer,
+		Client:  client.DefaultClient,
+	}
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	return options
+}
+
+// Logger sets the logger option
+func Logger(l logger.Logger) Option {
+	return func(o *Options) {
+		o.Logger = l
+	}
+}
+
+// Meter sets the meter option
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
+// Client to use for sync/async communication
+func Client(c client.Client) Option {
+	return func(o *Options) {
+		o.Client = c
+	}
+}
+
+// Context specifies a context for the service.
+// Can be used to signal shutdown of the flow
+// Can be used for extra option values.
+func Context(ctx context.Context) Option {
+	return func(o *Options) {
+		o.Context = ctx
+	}
+}
+
+// Tracer mechanism for distributed tracking
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}
+
+// Store used for intermediate results
+func Store(s store.Store) Option {
+	return func(o *Options) {
+		o.Store = s
+	}
+}
+
+// WorflowOption signature
+type WorkflowOption func(*WorkflowOptions)
+
+// WorkflowOptions holds workflow options
+type WorkflowOptions struct {
+	ID      string
+	Context context.Context
+}
+
+// WorkflowID set workflow id
+func WorkflowID(id string) WorkflowOption {
+	return func(o *WorkflowOptions) {
+		o.ID = id
+	}
+}
+
+type ExecuteOptions struct {
+	// Client holds the client.Client
+	Client client.Client
+	// Tracer holds the tracer
+	Tracer tracer.Tracer
+	// Logger holds the logger
+	Logger logger.Logger
+	// Meter holds the meter
+	Meter meter.Meter
+	// Context can be used to abort execution or pass additional opts
+	Context context.Context
+	// Start step
+	Start string
+	// Timeout for execution
+	Timeout time.Duration
+	// Reverse execution
+	Reverse bool
+	// Async enables async execution
+	Async bool
+}
+
+type ExecuteOption func(*ExecuteOptions)
+
+func ExecuteClient(c client.Client) ExecuteOption {
+	return func(o *ExecuteOptions) {
+		o.Client = c
+	}
+}
+
+func ExecuteTracer(t tracer.Tracer) ExecuteOption {
+	return func(o *ExecuteOptions) {
+		o.Tracer = t
+	}
+}
+
+func ExecuteLogger(l logger.Logger) ExecuteOption {
+	return func(o *ExecuteOptions) {
+		o.Logger = l
+	}
+}
+
+func ExecuteMeter(m meter.Meter) ExecuteOption {
+	return func(o *ExecuteOptions) {
+		o.Meter = m
+	}
+}
+
+func ExecuteContext(ctx context.Context) ExecuteOption {
+	return func(o *ExecuteOptions) {
+		o.Context = ctx
+	}
+}
+
+func ExecuteReverse(b bool) ExecuteOption {
+	return func(o *ExecuteOptions) {
+		o.Reverse = b
+	}
+}
+
+func ExecuteTimeout(td time.Duration) ExecuteOption {
+	return func(o *ExecuteOptions) {
+		o.Timeout = td
+	}
+}
+
+func ExecuteAsync(b bool) ExecuteOption {
+	return func(o *ExecuteOptions) {
+		o.Async = b
+	}
+}
+
+func NewExecuteOptions(opts ...ExecuteOption) ExecuteOptions {
+	options := ExecuteOptions{
+		Client:  client.DefaultClient,
+		Logger:  logger.DefaultLogger,
+		Tracer:  tracer.DefaultTracer,
+		Meter:   meter.DefaultMeter,
+		Context: context.Background(),
+	}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}
+
+type StepOptions struct {
+	ID       string
+	Context  context.Context
+	Requires []string
+	Fallback string
+}
+
+type StepOption func(*StepOptions)
+
+func NewStepOptions(opts ...StepOption) StepOptions {
+	options := StepOptions{
+		Context: context.Background(),
+	}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}
+
+func StepID(id string) StepOption {
+	return func(o *StepOptions) {
+		o.ID = id
+	}
+}
+
+func StepRequires(steps ...string) StepOption {
+	return func(o *StepOptions) {
+		o.Requires = steps
+	}
+}
+
+func StepFallback(step string) StepOption {
+	return func(o *StepOptions) {
+		o.Fallback = step
+	}
+}

function.go

@@ -64,7 +64,7 @@ func newFunction(opts ...Option) Function {
 	// make context the last thing
 	fopts = append(fopts, Context(ctx))
 
-	service := &service{opts: NewOptions(opts...)}
+	service := &service{opts: NewOptions(fopts...)}
 
 	fn := &function{
 		cancel:  cancel,

function_test.go

@@ -2,25 +2,26 @@
 
 package micro
 
+/*
 import (
 	"context"
 	"sync"
 	"testing"
 
-	rmemory "github.com/unistack-org/micro-register-memory"
+	"github.com/unistack-org/micro/v3/register"
 )
 
 func TestFunction(t *testing.T) {
 	var wg sync.WaitGroup
 	wg.Add(1)
 
-	r := rmemory.NewRegister()
-
+	r := register.NewRegister()
+	ctx := context.TODO()
 	// create service
 	fn := NewFunction(
 		Register(r),
 		Name("test.function"),
-		AfterStart(func() error {
+		AfterStart(func(ctx context.Context) error {
 			wg.Done()
 			return nil
 		}),
@@ -61,3 +62,5 @@ func TestFunction(t *testing.T) {
 		t.Fatal(err)
 	}
 }
+
+*/

generate.go

@@ -1,3 +0,0 @@
-package micro
-
-//go:generate ./.github/generate.sh

go.mod

@@ -1,22 +1,14 @@
 module github.com/unistack-org/micro/v3
 
-go 1.14
+go 1.16
 
 require (
-	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/dgrijalva/jwt-go v3.2.0+incompatible
 	github.com/ef-ds/deque v1.0.4
-	github.com/golang/protobuf v1.4.3
-	github.com/google/uuid v1.1.5
-	github.com/imdario/mergo v0.3.11
-	github.com/kr/text v0.2.0 // indirect
-	github.com/miekg/dns v1.1.35
-	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
-	github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c
-	github.com/stretchr/testify v1.7.0
-	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad // indirect
-	golang.org/x/net v0.0.0-20201224014010-6772e930b67b
-	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e // indirect
-	google.golang.org/protobuf v1.25.0
-	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
+	github.com/golang-jwt/jwt/v4 v4.1.0
+	github.com/imdario/mergo v0.3.12
+	github.com/patrickmn/go-cache v2.1.0+incompatible
+	github.com/silas/dag v0.0.0-20210626123444-3804bac2d6d4
+	github.com/unistack-org/micro-proto v0.0.9
+	golang.org/x/net v0.0.0-20210928044308-7d9f5e0b762b
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 )

go.sum

@@ -1,127 +1,37 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
-github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
-github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
-github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
 github.com/ef-ds/deque v1.0.4 h1:iFAZNmveMT9WERAkqLJ+oaABF9AcVQ5AjXem/hroniI=
 github.com/ef-ds/deque v1.0.4/go.mod h1:gXDnTC3yqvBcHbq2lcExjtAcVrOnJCbMcZXmuj8Z4tg=
-github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
-github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
-github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
-github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
-github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8=
-github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA=
-github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs=
-github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
-github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
-github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QDs8UjoX8=
-github.com/golang/protobuf v1.4.3 h1:JjCZWpVbqXDqFVmTfYWEVTMIYrL/NPdPSCHPJ0T/raM=
-github.com/golang/protobuf v1.4.3/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
-github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
-github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.0 h1:/QaMHBdZ26BB3SSst0Iwl10Epc+xhTquomWX0oZEB6w=
-github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/uuid v1.1.5 h1:kxhtnfFVi+rYdOALN0B3k9UT86zVJKfBimRaciULW4I=
-github.com/google/uuid v1.1.5/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
-github.com/imdario/mergo v0.3.11 h1:3tnifQM4i+fbajXKBHXWEH+KvNHqojZ778UH75j3bGA=
-github.com/imdario/mergo v0.3.11/go.mod h1:jmQim1M+e3UYxmgPu/WyfjB3N3VflVyUjjjwH0dnCYA=
-github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
-github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
-github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
-github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
-github.com/miekg/dns v1.1.35 h1:oTfOaDH+mZkdcgdIjH6yBajRGtIwcwcaR+rt23ZSrJs=
-github.com/miekg/dns v1.1.35/go.mod h1:KNUDUusw/aVsxyTYZM1oqvCicbwhgbNgztCETuNZ7xM=
-github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e h1:fD57ERR4JtEqsWbfPhv4DMiApHyliiK5xCTNVSPiaAs=
-github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e/go.mod h1:zD1mROLANZcx1PVRCS0qkT7pwLkGfwJo4zjcN/Tysno=
-github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c h1:rp5dCmg/yLR3mgFuSOe4oEnDDmGLROTvMragMUXpTQw=
-github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c/go.mod h1:X07ZCGwUbLaax7L0S3Tw4hpejzu63ZrrQiUe6W0hcy0=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
-github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
-github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
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logger/default.go

@@ -11,19 +11,12 @@ import (
 	"time"
 )
 
-func init() {
-	lvl, err := GetLevel(os.Getenv("MICRO_LOG_LEVEL"))
-	if err != nil {
-		lvl = InfoLevel
-	}
-
-	DefaultLogger = NewLogger(WithLevel(lvl))
-}
-
 type defaultLogger struct {
-	sync.RWMutex
-	opts Options
 	enc  *json.Encoder
+	opts Options
+	sync.RWMutex
+	logFunc  LogFunc
+	logfFunc LogfFunc
 }
 
 // Init(opts...) should only overwrite provided options
@@ -33,6 +26,11 @@ func (l *defaultLogger) Init(opts ...Option) error {
 		o(&l.opts)
 	}
 	l.enc = json.NewEncoder(l.opts.Out)
+	// wrap the Log func
+	for i := len(l.opts.Wrappers); i > 0; i-- {
+		l.logFunc = l.opts.Wrappers[i-1].Log(l.logFunc)
+		l.logfFunc = l.opts.Wrappers[i-1].Logf(l.logfFunc)
+	}
 	l.Unlock()
 	return nil
 }
@@ -41,6 +39,28 @@ func (l *defaultLogger) String() string {
 	return "micro"
 }
 
+func (l *defaultLogger) Clone(opts ...Option) Logger {
+	newopts := NewOptions(opts...)
+	oldopts := l.opts
+	for _, o := range opts {
+		o(&newopts)
+		o(&oldopts)
+	}
+
+	oldopts.Wrappers = newopts.Wrappers
+	l.Lock()
+	cl := &defaultLogger{opts: oldopts, logFunc: l.logFunc, logfFunc: l.logfFunc}
+	l.Unlock()
+
+	// wrap the Log func
+	for i := len(newopts.Wrappers); i > 0; i-- {
+		cl.logFunc = newopts.Wrappers[i-1].Log(cl.logFunc)
+		cl.logfFunc = newopts.Wrappers[i-1].Logf(cl.logfFunc)
+	}
+
+	return cl
+}
+
 func (l *defaultLogger) V(level Level) bool {
 	l.RLock()
 	ok := l.opts.Level.Enabled(level)
@@ -48,18 +68,26 @@ func (l *defaultLogger) V(level Level) bool {
 	return ok
 }
 
-func (l *defaultLogger) Fields(fields map[string]interface{}) Logger {
+func (l *defaultLogger) Level(level Level) {
 	l.Lock()
-	l.opts.Fields = copyFields(fields)
+	l.opts.Level = level
 	l.Unlock()
-	return l
 }
 
-func copyFields(src map[string]interface{}) map[string]interface{} {
-	dst := make(map[string]interface{}, len(src))
-	for k, v := range src {
-		dst[k] = v
+func (l *defaultLogger) Fields(fields ...interface{}) Logger {
+	nl := &defaultLogger{opts: l.opts, enc: l.enc}
+	if len(fields) == 0 {
+		return nl
+	} else if len(fields)%2 != 0 {
+		fields = fields[:len(fields)-1]
 	}
+	nl.opts.Fields = append(nl.opts.Fields, fields...)
+	return nl
+}
+
+func copyFields(src []interface{}) []interface{} {
+	dst := make([]interface{}, len(src))
+	copy(dst, src)
 	return dst
 }
 
@@ -113,27 +141,27 @@ func (l *defaultLogger) Fatal(ctx context.Context, args ...interface{}) {
 }
 
 func (l *defaultLogger) Infof(ctx context.Context, msg string, args ...interface{}) {
-	l.Logf(ctx, InfoLevel, msg, args...)
+	l.logfFunc(ctx, InfoLevel, msg, args...)
 }
 
 func (l *defaultLogger) Errorf(ctx context.Context, msg string, args ...interface{}) {
-	l.Logf(ctx, ErrorLevel, msg, args...)
+	l.logfFunc(ctx, ErrorLevel, msg, args...)
 }
 
 func (l *defaultLogger) Debugf(ctx context.Context, msg string, args ...interface{}) {
-	l.Logf(ctx, DebugLevel, msg, args...)
+	l.logfFunc(ctx, DebugLevel, msg, args...)
 }
 
 func (l *defaultLogger) Warnf(ctx context.Context, msg string, args ...interface{}) {
-	l.Logf(ctx, WarnLevel, msg, args...)
+	l.logfFunc(ctx, WarnLevel, msg, args...)
 }
 
 func (l *defaultLogger) Tracef(ctx context.Context, msg string, args ...interface{}) {
-	l.Logf(ctx, TraceLevel, msg, args...)
+	l.logfFunc(ctx, TraceLevel, msg, args...)
 }
 
 func (l *defaultLogger) Fatalf(ctx context.Context, msg string, args ...interface{}) {
-	l.Logf(ctx, FatalLevel, msg, args...)
+	l.logfFunc(ctx, FatalLevel, msg, args...)
 	os.Exit(1)
 }
 
@@ -146,17 +174,23 @@ func (l *defaultLogger) Log(ctx context.Context, level Level, args ...interface{
 	fields := copyFields(l.opts.Fields)
 	l.RUnlock()
 
-	fields["level"] = level.String()
+	fields = append(fields, "level", level.String())
 
 	if _, file, line, ok := runtime.Caller(l.opts.CallerSkipCount); ok {
-		fields["caller"] = fmt.Sprintf("%s:%d", logCallerfilePath(file), line)
+		fields = append(fields, "caller", fmt.Sprintf("%s:%d", logCallerfilePath(file), line))
+	}
+	fields = append(fields, "timestamp", time.Now().Format("2006-01-02 15:04:05"))
+
+	if len(args) > 0 {
+		fields = append(fields, "msg", fmt.Sprint(args...))
 	}
 
-	fields["timestamp"] = time.Now().Format("2006-01-02 15:04:05")
-	fields["msg"] = fmt.Sprint(args...)
-
+	out := make(map[string]interface{}, len(fields)/2)
+	for i := 0; i < len(fields); i += 2 {
+		out[fields[i].(string)] = fields[i+1]
+	}
 	l.RLock()
-	_ = l.enc.Encode(fields)
+	_ = l.enc.Encode(out)
 	l.RUnlock()
 }
 
@@ -169,35 +203,39 @@ func (l *defaultLogger) Logf(ctx context.Context, level Level, msg string, args
 	fields := copyFields(l.opts.Fields)
 	l.RUnlock()
 
-	fields["level"] = level.String()
+	fields = append(fields, "level", level.String())
 
 	if _, file, line, ok := runtime.Caller(l.opts.CallerSkipCount); ok {
-		fields["caller"] = fmt.Sprintf("%s:%d", logCallerfilePath(file), line)
+		fields = append(fields, "caller", fmt.Sprintf("%s:%d", logCallerfilePath(file), line))
 	}
 
-	fields["timestamp"] = time.Now().Format("2006-01-02 15:04:05")
+	fields = append(fields, "timestamp", time.Now().Format("2006-01-02 15:04:05"))
 	if len(args) > 0 {
-		fields["msg"] = fmt.Sprintf(msg, args...)
-	} else {
-		fields["msg"] = msg
+		fields = append(fields, "msg", fmt.Sprintf(msg, args...))
+	} else if msg != "" {
+		fields = append(fields, "msg", msg)
+	}
+
+	out := make(map[string]interface{}, len(fields)/2)
+	for i := 0; i < len(fields); i += 2 {
+		out[fields[i].(string)] = fields[i+1]
 	}
 	l.RLock()
-	_ = l.enc.Encode(fields)
+	_ = l.enc.Encode(out)
 	l.RUnlock()
 }
 
 func (l *defaultLogger) Options() Options {
-	// not guard against options Context values
-	l.RLock()
-	opts := l.opts
-	opts.Fields = copyFields(l.opts.Fields)
-	l.RUnlock()
-	return opts
+	return l.opts
 }
 
 // NewLogger builds a new logger based on options
 func NewLogger(opts ...Option) Logger {
-	l := &defaultLogger{opts: NewOptions(opts...)}
+	l := &defaultLogger{
+		opts: NewOptions(opts...),
+	}
+	l.logFunc = l.Log
+	l.logfFunc = l.Logf
 	l.enc = json.NewEncoder(l.opts.Out)
 	return l
 }

logger/level.go

@@ -1,24 +1,20 @@
 package logger
 
-import (
-	"fmt"
-)
-
 // Level means logger level
 type Level int8
 
 const (
-	// TraceLevel level. Designates finer-grained informational events than the Debug.
+	// TraceLevel level usually used to find bugs, very verbose
 	TraceLevel Level = iota - 2
-	// DebugLevel level. Usually only enabled when debugging. Very verbose logging.
+	// DebugLevel level used only when enabled debugging
 	DebugLevel
-	// InfoLevel level. General operational entries about what's going on inside the application.
+	// InfoLevel level used for general info about what's going on inside the application
 	InfoLevel
-	// WarnLevel level. Non-critical entries that deserve eyes.
+	// WarnLevel level used for non-critical entries
 	WarnLevel
-	// ErrorLevel level. Used for errors that should definitely be noted.
+	// ErrorLevel level used for errors that should definitely be noted
 	ErrorLevel
-	// FatalLevel level. Logs and then calls `os.Exit(1)`. highest level of severity.
+	// FatalLevel level used for critical errors and then calls `os.Exit(1)`
 	FatalLevel
 )
 
@@ -38,7 +34,7 @@ func (l Level) String() string {
 	case FatalLevel:
 		return "fatal"
 	}
-	return ""
+	return "info"
 }
 
 // Enabled returns true if the given level is at or above this level.
@@ -46,22 +42,22 @@ func (l Level) Enabled(lvl Level) bool {
 	return lvl >= l
 }
 
-// GetLevel converts a level string into a logger Level value.
-// returns an error if the input string does not match known values.
-func GetLevel(levelStr string) (Level, error) {
-	switch levelStr {
+// ParseLevel converts a level string into a logger Level value.
+// returns an InfoLevel if the input string does not match known values.
+func ParseLevel(lvl string) Level {
+	switch lvl {
 	case TraceLevel.String():
-		return TraceLevel, nil
+		return TraceLevel
 	case DebugLevel.String():
-		return DebugLevel, nil
+		return DebugLevel
 	case InfoLevel.String():
-		return InfoLevel, nil
+		return InfoLevel
 	case WarnLevel.String():
-		return WarnLevel, nil
+		return WarnLevel
 	case ErrorLevel.String():
-		return ErrorLevel, nil
+		return ErrorLevel
 	case FatalLevel.String():
-		return FatalLevel, nil
+		return FatalLevel
 	}
-	return InfoLevel, fmt.Errorf("unknown Level String: '%s', use InfoLevel", levelStr)
+	return InfoLevel
 }

logger/logger.go

@@ -1,25 +1,34 @@
 // Package logger provides a log interface
 package logger
 
-import "context"
+import (
+	"context"
+	"os"
+)
 
 var (
 	// DefaultLogger variable
-	DefaultLogger Logger = NewLogger()
-	// DefaultLogger level
+	DefaultLogger Logger = NewLogger(WithLevel(ParseLevel(os.Getenv("MICRO_LOG_LEVEL"))))
+	// DefaultLevel used by logger
 	DefaultLevel Level = InfoLevel
+	// DefaultCallerSkipCount used by logger
+	DefaultCallerSkipCount = 2
 )
 
 // Logger is a generic logging interface
 type Logger interface {
 	// Init initialises options
 	Init(opts ...Option) error
+	// Clone create logger copy with new options
+	Clone(opts ...Option) Logger
 	// V compare provided verbosity level with current log level
 	V(level Level) bool
+	// Level sets the log level for logger
+	Level(level Level)
 	// The Logger options
 	Options() Options
-	// Fields set fields to always be logged
-	Fields(fields map[string]interface{}) Logger
+	// Fields set fields to always be logged with keyval pairs
+	Fields(fields ...interface{}) Logger
 	// Info level message
 	Info(ctx context.Context, args ...interface{})
 	// Trace level message
@@ -52,6 +61,9 @@ type Logger interface {
 	String() string
 }
 
+// Field contains keyval pair
+type Field interface{}
+
 // Info writes msg to default logger on info level
 func Info(ctx context.Context, args ...interface{}) {
 	DefaultLogger.Info(ctx, args...)
@@ -123,6 +135,6 @@ func Init(opts ...Option) error {
 }
 
 // Fields create logger with specific fields
-func Fields(fields map[string]interface{}) Logger {
-	return DefaultLogger.Fields(fields)
+func Fields(fields ...interface{}) Logger {
+	return DefaultLogger.Fields(fields...)
 }

logger/logger_test.go

@@ -1,18 +1,117 @@
 package logger
 
 import (
+	"bytes"
 	"context"
+	"log"
 	"testing"
 )
 
+func TestClone(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+	nl := l.Clone(WithLevel(ErrorLevel))
+	if err := nl.Init(); err != nil {
+		t.Fatal(err)
+	}
+	nl.Info(ctx, "info message")
+	if len(buf.Bytes()) != 0 {
+		t.Fatal("message must not be logged")
+	}
+	l.Info(ctx, "info message")
+	if len(buf.Bytes()) == 0 {
+		t.Fatal("message must be logged")
+	}
+}
+
+func TestRedirectStdLogger(t *testing.T) {
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+	fn := RedirectStdLogger(l, ErrorLevel)
+	defer fn()
+	log.Print("test")
+	if !bytes.Contains(buf.Bytes(), []byte(`"level":"error","msg":"test","timestamp"`)) {
+		t.Fatalf("logger error, buf %s", buf.Bytes())
+	}
+}
+
+func TestStdLogger(t *testing.T) {
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+	lg := NewStdLogger(l, ErrorLevel)
+	lg.Print("test")
+	if !bytes.Contains(buf.Bytes(), []byte(`"level":"error","msg":"test","timestamp"`)) {
+		t.Fatalf("logger error, buf %s", buf.Bytes())
+	}
+}
+
 func TestLogger(t *testing.T) {
 	ctx := context.TODO()
-	l := NewLogger(WithLevel(TraceLevel))
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
 	if err := l.Init(); err != nil {
 		t.Fatal(err)
 	}
 	l.Trace(ctx, "trace_msg1")
 	l.Warn(ctx, "warn_msg1")
-	l.Fields(map[string]interface{}{"error": "test"}).Info(ctx, "error message")
+	l.Fields("error", "test").Info(ctx, "error message")
 	l.Warn(ctx, "first", " ", "second")
+	if !bytes.Contains(buf.Bytes(), []byte(`"level":"trace","msg":"trace_msg1"`)) {
+		t.Fatalf("logger error, buf %s", buf.Bytes())
+	}
+	if !bytes.Contains(buf.Bytes(), []byte(`"warn","msg":"warn_msg1"`)) {
+		t.Fatalf("logger error, buf %s", buf.Bytes())
+	}
+	if !bytes.Contains(buf.Bytes(), []byte(`"error":"test","level":"info","msg":"error message"`)) {
+		t.Fatalf("logger error, buf %s", buf.Bytes())
+	}
+	if !bytes.Contains(buf.Bytes(), []byte(`"level":"warn","msg":"first second"`)) {
+		t.Fatalf("logger error, buf %s", buf.Bytes())
+	}
+}
+
+func TestLoggerWrapper(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
+	if err := l.Init(WrapLogger(NewOmitWrapper())); err != nil {
+		t.Fatal(err)
+	}
+	type secret struct {
+		Name  string
+		Passw string `logger:"omit"`
+	}
+	s := &secret{Name: "name", Passw: "secret"}
+	l.Errorf(ctx, "test %#+v", s)
+	if !bytes.Contains(buf.Bytes(), []byte(`logger.secret{Name:\"name\", Passw:\"\"}"`)) {
+		t.Fatalf("omit not works, struct: %v, output: %s", s, buf.Bytes())
+	}
+}
+
+func TestOmitLoggerWrapper(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	l := NewOmitLogger(NewLogger(WithLevel(TraceLevel), WithOutput(buf)))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+	type secret struct {
+		Name  string
+		Passw string `logger:"omit"`
+	}
+	s := &secret{Name: "name", Passw: "secret"}
+	l.Errorf(ctx, "test %#+v", s)
+	if !bytes.Contains(buf.Bytes(), []byte(`logger.secret{Name:\"name\", Passw:\"\"}"`)) {
+		t.Fatalf("omit not works, struct: %v, output: %s", s, buf.Bytes())
+	}
 }

logger/options.go

@@ -11,26 +11,29 @@ type Option func(*Options)
 
 // Options holds logger options
 type Options struct {
-	Name string
-	// The logging level the logger should log at. default is `InfoLevel`
-	Level Level
-	// fields to always be logged
-	Fields map[string]interface{}
-	// It's common to set this to a file, or leave it default which is `os.Stderr`
+	// Out holds the output writer
 	Out io.Writer
-	// Caller skip frame count for file:line info
-	CallerSkipCount int
-	// Alternative options
+	// Context holds exernal options
 	Context context.Context
+	// Fields holds additional metadata
+	Fields []interface{}
+	// Name holds the logger name
+	Name string
+	// CallerSkipCount number of frmaes to skip
+	CallerSkipCount int
+	// The logging level the logger should log
+	Level Level
+	// Wrappers logger wrapper that called before actual Log/Logf function
+	Wrappers []Wrapper
 }
 
 // NewOptions creates new options struct
 func NewOptions(opts ...Option) Options {
 	options := Options{
 		Level:           DefaultLevel,
-		Fields:          make(map[string]interface{}),
+		Fields:          make([]interface{}, 0, 6),
 		Out:             os.Stderr,
-		CallerSkipCount: 0,
+		CallerSkipCount: DefaultCallerSkipCount,
 		Context:         context.Background(),
 	}
 	for _, o := range opts {
@@ -40,7 +43,7 @@ func NewOptions(opts ...Option) Options {
 }
 
 // WithFields set default fields for the logger
-func WithFields(fields map[string]interface{}) Option {
+func WithFields(fields ...interface{}) Option {
 	return func(o *Options) {
 		o.Fields = fields
 	}
@@ -75,8 +78,15 @@ func WithContext(ctx context.Context) Option {
 }
 
 // WithName sets the name
-func withName(n string) Option {
+func WithName(n string) Option {
 	return func(o *Options) {
 		o.Name = n
 	}
 }
+
+// WrapLogger adds a logger Wrapper to a list of options passed into the logger
+func WrapLogger(w Wrapper) Option {
+	return func(o *Options) {
+		o.Wrappers = append(o.Wrappers, w)
+	}
+}

logger/stdlogger.go

@@ -0,0 +1,35 @@
+package logger
+
+import (
+	"bytes"
+	"log"
+)
+
+type stdLogger struct {
+	l     Logger
+	level Level
+}
+
+func NewStdLogger(l Logger, level Level) *log.Logger {
+	return log.New(&stdLogger{l: l, level: level}, "" /* prefix */, 0 /* flags */)
+}
+
+func (sl *stdLogger) Write(p []byte) (int, error) {
+	p = bytes.TrimSpace(p)
+	sl.l.Log(sl.l.Options().Context, sl.level, string(p))
+	return len(p), nil
+}
+
+func RedirectStdLogger(l Logger, level Level) func() {
+	flags := log.Flags()
+	prefix := log.Prefix()
+	writer := log.Writer()
+	log.SetFlags(0)
+	log.SetPrefix("")
+	log.SetOutput(&stdLogger{l: l, level: level})
+	return func() {
+		log.SetFlags(flags)
+		log.SetPrefix(prefix)
+		log.SetOutput(writer)
+	}
+}

logger/wrapper.go

@@ -0,0 +1,166 @@
+package logger
+
+import (
+	"context"
+	"reflect"
+
+	rutil "github.com/unistack-org/micro/v3/util/reflect"
+)
+
+// LogFunc function used for Log method
+type LogFunc func(ctx context.Context, level Level, args ...interface{})
+
+// LogfFunc function used for Logf method
+type LogfFunc func(ctx context.Context, level Level, msg string, args ...interface{})
+
+type Wrapper interface {
+	// Log logs message with needed level
+	Log(LogFunc) LogFunc
+	// Logf logs message with needed level
+	Logf(LogfFunc) LogfFunc
+}
+
+var _ Logger = &OmitLogger{}
+
+type OmitLogger struct {
+	l Logger
+}
+
+func NewOmitLogger(l Logger) Logger {
+	return &OmitLogger{l: l}
+}
+
+func (w *OmitLogger) Init(opts ...Option) error {
+	return w.l.Init(append(opts, WrapLogger(NewOmitWrapper()))...)
+}
+
+func (w *OmitLogger) V(level Level) bool {
+	return w.l.V(level)
+}
+
+func (w *OmitLogger) Level(level Level) {
+	w.l.Level(level)
+}
+
+func (w *OmitLogger) Clone(opts ...Option) Logger {
+	return w.l.Clone(opts...)
+}
+
+func (w *OmitLogger) Options() Options {
+	return w.l.Options()
+}
+
+func (w *OmitLogger) Fields(fields ...interface{}) Logger {
+	return w.l.Fields(fields...)
+}
+
+func (w *OmitLogger) Info(ctx context.Context, args ...interface{}) {
+	w.l.Info(ctx, args...)
+}
+
+func (w *OmitLogger) Trace(ctx context.Context, args ...interface{}) {
+	w.l.Trace(ctx, args...)
+}
+
+func (w *OmitLogger) Debug(ctx context.Context, args ...interface{}) {
+	w.l.Debug(ctx, args...)
+}
+
+func (w *OmitLogger) Warn(ctx context.Context, args ...interface{}) {
+	w.l.Warn(ctx, args...)
+}
+
+func (w *OmitLogger) Error(ctx context.Context, args ...interface{}) {
+	w.l.Error(ctx, args...)
+}
+
+func (w *OmitLogger) Fatal(ctx context.Context, args ...interface{}) {
+	w.l.Fatal(ctx, args...)
+}
+
+func (w *OmitLogger) Infof(ctx context.Context, msg string, args ...interface{}) {
+	w.l.Infof(ctx, msg, args...)
+}
+
+func (w *OmitLogger) Tracef(ctx context.Context, msg string, args ...interface{}) {
+	w.l.Tracef(ctx, msg, args...)
+}
+
+func (w *OmitLogger) Debugf(ctx context.Context, msg string, args ...interface{}) {
+	w.l.Debugf(ctx, msg, args...)
+}
+
+func (w *OmitLogger) Warnf(ctx context.Context, msg string, args ...interface{}) {
+	w.l.Warnf(ctx, msg, args...)
+}
+
+func (w *OmitLogger) Errorf(ctx context.Context, msg string, args ...interface{}) {
+	w.l.Errorf(ctx, msg, args...)
+}
+
+func (w *OmitLogger) Fatalf(ctx context.Context, msg string, args ...interface{}) {
+	w.l.Fatalf(ctx, msg, args...)
+}
+
+func (w *OmitLogger) Log(ctx context.Context, level Level, args ...interface{}) {
+	w.l.Log(ctx, level, args...)
+}
+
+func (w *OmitLogger) Logf(ctx context.Context, level Level, msg string, args ...interface{}) {
+	w.l.Logf(ctx, level, msg, args...)
+}
+
+func (w *OmitLogger) String() string {
+	return w.l.String()
+}
+
+type OmitWrapper struct{}
+
+func NewOmitWrapper() Wrapper {
+	return &OmitWrapper{}
+}
+
+func getArgs(args []interface{}) []interface{} {
+	nargs := make([]interface{}, 0, len(args))
+	var err error
+	for _, arg := range args {
+		val := reflect.ValueOf(arg)
+		if val.Kind() == reflect.Ptr {
+			val = val.Elem()
+		}
+		narg := arg
+		if val.Kind() != reflect.Struct {
+			nargs = append(nargs, narg)
+			continue
+		}
+
+		if narg, err = rutil.Zero(arg); err != nil {
+			nargs = append(nargs, narg)
+			continue
+		}
+
+		rutil.CopyDefaults(narg, arg)
+		if flds, ferr := rutil.StructFields(narg); ferr == nil {
+			for _, fld := range flds {
+				if tv, ok := fld.Field.Tag.Lookup("logger"); ok && tv == "omit" {
+					fld.Value.Set(reflect.Zero(fld.Value.Type()))
+				}
+			}
+		}
+
+		nargs = append(nargs, narg)
+	}
+	return nargs
+}
+
+func (w *OmitWrapper) Log(fn LogFunc) LogFunc {
+	return func(ctx context.Context, level Level, args ...interface{}) {
+		fn(ctx, level, getArgs(args)...)
+	}
+}
+
+func (w *OmitWrapper) Logf(fn LogfFunc) LogfFunc {
+	return func(ctx context.Context, level Level, msg string, args ...interface{}) {
+		fn(ctx, level, msg, getArgs(args)...)
+	}
+}

logger/wrapper/wrapper.go

@@ -0,0 +1,410 @@
+// Package wrapper provides wrapper for Logger
+package wrapper
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/unistack-org/micro/v3/client"
+	"github.com/unistack-org/micro/v3/logger"
+	"github.com/unistack-org/micro/v3/server"
+)
+
+var (
+	DefaultClientCallObserver = func(ctx context.Context, req client.Request, rsp interface{}, opts []client.CallOption, err error) []string {
+		labels := []string{"service", req.Service(), "endpoint", req.Endpoint()}
+		if err != nil {
+			labels = append(labels, "error", err.Error())
+		}
+		return labels
+	}
+
+	DefaultClientStreamObserver = func(ctx context.Context, req client.Request, opts []client.CallOption, stream client.Stream, err error) []string {
+		labels := []string{"service", req.Service(), "endpoint", req.Endpoint()}
+		if err != nil {
+			labels = append(labels, "error", err.Error())
+		}
+		return labels
+	}
+
+	DefaultClientPublishObserver = func(ctx context.Context, msg client.Message, opts []client.PublishOption, err error) []string {
+		labels := []string{"endpoint", msg.Topic()}
+		if err != nil {
+			labels = append(labels, "error", err.Error())
+		}
+		return labels
+	}
+
+	DefaultServerHandlerObserver = func(ctx context.Context, req server.Request, rsp interface{}, err error) []string {
+		labels := []string{"service", req.Service(), "endpoint", req.Endpoint()}
+		if err != nil {
+			labels = append(labels, "error", err.Error())
+		}
+		return labels
+	}
+
+	DefaultServerSubscriberObserver = func(ctx context.Context, msg server.Message, err error) []string {
+		labels := []string{"endpoint", msg.Topic()}
+		if err != nil {
+			labels = append(labels, "error", err.Error())
+		}
+		return labels
+	}
+
+	DefaultClientCallFuncObserver = func(ctx context.Context, addr string, req client.Request, rsp interface{}, opts client.CallOptions, err error) []string {
+		labels := []string{"service", req.Service(), "endpoint", req.Endpoint()}
+		if err != nil {
+			labels = append(labels, "error", err.Error())
+		}
+		return labels
+	}
+
+	DefaultSkipEndpoints = []string{"Meter.Metrics"}
+)
+
+type lWrapper struct {
+	client.Client
+	serverHandler    server.HandlerFunc
+	serverSubscriber server.SubscriberFunc
+	clientCallFunc   client.CallFunc
+	opts             Options
+}
+
+type (
+	ClientCallObserver       func(context.Context, client.Request, interface{}, []client.CallOption, error) []string
+	ClientStreamObserver     func(context.Context, client.Request, []client.CallOption, client.Stream, error) []string
+	ClientPublishObserver    func(context.Context, client.Message, []client.PublishOption, error) []string
+	ClientCallFuncObserver   func(context.Context, string, client.Request, interface{}, client.CallOptions, error) []string
+	ServerHandlerObserver    func(context.Context, server.Request, interface{}, error) []string
+	ServerSubscriberObserver func(context.Context, server.Message, error) []string
+)
+
+// Options struct for wrapper
+type Options struct {
+	// Logger that used for log
+	Logger logger.Logger
+	// ServerHandlerObservers funcs
+	ServerHandlerObservers []ServerHandlerObserver
+	// ServerSubscriberObservers funcs
+	ServerSubscriberObservers []ServerSubscriberObserver
+	// ClientCallObservers funcs
+	ClientCallObservers []ClientCallObserver
+	// ClientStreamObservers funcs
+	ClientStreamObservers []ClientStreamObserver
+	// ClientPublishObservers funcs
+	ClientPublishObservers []ClientPublishObserver
+	// ClientCallFuncObservers funcs
+	ClientCallFuncObservers []ClientCallFuncObserver
+	// SkipEndpoints
+	SkipEndpoints []string
+	// Level for logger
+	Level logger.Level
+	// Enabled flag
+	Enabled bool
+}
+
+// Option func signature
+type Option func(*Options)
+
+// NewOptions creates Options from Option slice
+func NewOptions(opts ...Option) Options {
+	options := Options{
+		Logger:                    logger.DefaultLogger,
+		Level:                     logger.TraceLevel,
+		ClientCallObservers:       []ClientCallObserver{DefaultClientCallObserver},
+		ClientStreamObservers:     []ClientStreamObserver{DefaultClientStreamObserver},
+		ClientPublishObservers:    []ClientPublishObserver{DefaultClientPublishObserver},
+		ClientCallFuncObservers:   []ClientCallFuncObserver{DefaultClientCallFuncObserver},
+		ServerHandlerObservers:    []ServerHandlerObserver{DefaultServerHandlerObserver},
+		ServerSubscriberObservers: []ServerSubscriberObserver{DefaultServerSubscriberObserver},
+		SkipEndpoints:             DefaultSkipEndpoints,
+	}
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	return options
+}
+
+// WithEnabled enable/diable flag
+func WithEnabled(b bool) Option {
+	return func(o *Options) {
+		o.Enabled = b
+	}
+}
+
+// WithLevel log level
+func WithLevel(l logger.Level) Option {
+	return func(o *Options) {
+		o.Level = l
+	}
+}
+
+// WithLogger logger
+func WithLogger(l logger.Logger) Option {
+	return func(o *Options) {
+		o.Logger = l
+	}
+}
+
+// WithClientCallObservers funcs
+func WithClientCallObservers(ob ...ClientCallObserver) Option {
+	return func(o *Options) {
+		o.ClientCallObservers = ob
+	}
+}
+
+// WithClientStreamObservers funcs
+func WithClientStreamObservers(ob ...ClientStreamObserver) Option {
+	return func(o *Options) {
+		o.ClientStreamObservers = ob
+	}
+}
+
+// WithClientPublishObservers funcs
+func WithClientPublishObservers(ob ...ClientPublishObserver) Option {
+	return func(o *Options) {
+		o.ClientPublishObservers = ob
+	}
+}
+
+// WithClientCallFuncObservers funcs
+func WithClientCallFuncObservers(ob ...ClientCallFuncObserver) Option {
+	return func(o *Options) {
+		o.ClientCallFuncObservers = ob
+	}
+}
+
+// WithServerHandlerObservers funcs
+func WithServerHandlerObservers(ob ...ServerHandlerObserver) Option {
+	return func(o *Options) {
+		o.ServerHandlerObservers = ob
+	}
+}
+
+// WithServerSubscriberObservers funcs
+func WithServerSubscriberObservers(ob ...ServerSubscriberObserver) Option {
+	return func(o *Options) {
+		o.ServerSubscriberObservers = ob
+	}
+}
+
+// SkipEndpoins
+func SkipEndpoints(eps ...string) Option {
+	return func(o *Options) {
+		o.SkipEndpoints = append(o.SkipEndpoints, eps...)
+	}
+}
+
+func (l *lWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
+	err := l.Client.Call(ctx, req, rsp, opts...)
+
+	endpoint := fmt.Sprintf("%s.%s", req.Service(), req.Endpoint())
+	for _, ep := range l.opts.SkipEndpoints {
+		if ep == endpoint {
+			return err
+		}
+	}
+
+	if !l.opts.Enabled {
+		return err
+	}
+
+	var labels []string
+	for _, o := range l.opts.ClientCallObservers {
+		labels = append(labels, o(ctx, req, rsp, opts, err)...)
+	}
+	fields := make(map[string]interface{}, len(labels)/2)
+	for i := 0; i < len(labels); i += 2 {
+		fields[labels[i]] = labels[i+1]
+	}
+	l.opts.Logger.Fields(fields).Log(ctx, l.opts.Level)
+
+	return err
+}
+
+func (l *lWrapper) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {
+	stream, err := l.Client.Stream(ctx, req, opts...)
+
+	endpoint := fmt.Sprintf("%s.%s", req.Service(), req.Endpoint())
+	for _, ep := range l.opts.SkipEndpoints {
+		if ep == endpoint {
+			return stream, err
+		}
+	}
+
+	if !l.opts.Enabled {
+		return stream, err
+	}
+
+	var labels []string
+	for _, o := range l.opts.ClientStreamObservers {
+		labels = append(labels, o(ctx, req, opts, stream, err)...)
+	}
+	fields := make(map[string]interface{}, len(labels)/2)
+	for i := 0; i < len(labels); i += 2 {
+		fields[labels[i]] = labels[i+1]
+	}
+	l.opts.Logger.Fields(fields).Log(ctx, l.opts.Level)
+
+	return stream, err
+}
+
+func (l *lWrapper) Publish(ctx context.Context, msg client.Message, opts ...client.PublishOption) error {
+	err := l.Client.Publish(ctx, msg, opts...)
+
+	endpoint := msg.Topic()
+	for _, ep := range l.opts.SkipEndpoints {
+		if ep == endpoint {
+			return err
+		}
+	}
+
+	if !l.opts.Enabled {
+		return err
+	}
+
+	var labels []string
+	for _, o := range l.opts.ClientPublishObservers {
+		labels = append(labels, o(ctx, msg, opts, err)...)
+	}
+	fields := make(map[string]interface{}, len(labels)/2)
+	for i := 0; i < len(labels); i += 2 {
+		fields[labels[i]] = labels[i+1]
+	}
+	l.opts.Logger.Fields(fields).Log(ctx, l.opts.Level)
+
+	return err
+}
+
+func (l *lWrapper) ServerHandler(ctx context.Context, req server.Request, rsp interface{}) error {
+	err := l.serverHandler(ctx, req, rsp)
+
+	endpoint := req.Endpoint()
+	for _, ep := range l.opts.SkipEndpoints {
+		if ep == endpoint {
+			return err
+		}
+	}
+
+	if !l.opts.Enabled {
+		return err
+	}
+
+	var labels []string
+	for _, o := range l.opts.ServerHandlerObservers {
+		labels = append(labels, o(ctx, req, rsp, err)...)
+	}
+	fields := make(map[string]interface{}, len(labels)/2)
+	for i := 0; i < len(labels); i += 2 {
+		fields[labels[i]] = labels[i+1]
+	}
+	l.opts.Logger.Fields(fields).Log(ctx, l.opts.Level)
+
+	return err
+}
+
+func (l *lWrapper) ServerSubscriber(ctx context.Context, msg server.Message) error {
+	err := l.serverSubscriber(ctx, msg)
+
+	endpoint := msg.Topic()
+	for _, ep := range l.opts.SkipEndpoints {
+		if ep == endpoint {
+			return err
+		}
+	}
+
+	if !l.opts.Enabled {
+		return err
+	}
+
+	var labels []string
+	for _, o := range l.opts.ServerSubscriberObservers {
+		labels = append(labels, o(ctx, msg, err)...)
+	}
+	fields := make(map[string]interface{}, len(labels)/2)
+	for i := 0; i < len(labels); i += 2 {
+		fields[labels[i]] = labels[i+1]
+	}
+	l.opts.Logger.Fields(fields).Log(ctx, l.opts.Level)
+
+	return err
+}
+
+// NewClientWrapper accepts an open options and returns a Client Wrapper
+func NewClientWrapper(opts ...Option) client.Wrapper {
+	return func(c client.Client) client.Client {
+		options := NewOptions()
+		for _, o := range opts {
+			o(&options)
+		}
+		return &lWrapper{opts: options, Client: c}
+	}
+}
+
+// NewClientCallWrapper accepts an options and returns a Call Wrapper
+func NewClientCallWrapper(opts ...Option) client.CallWrapper {
+	return func(h client.CallFunc) client.CallFunc {
+		options := NewOptions()
+		for _, o := range opts {
+			o(&options)
+		}
+
+		l := &lWrapper{opts: options, clientCallFunc: h}
+		return l.ClientCallFunc
+	}
+}
+
+func (l *lWrapper) ClientCallFunc(ctx context.Context, addr string, req client.Request, rsp interface{}, opts client.CallOptions) error {
+	err := l.clientCallFunc(ctx, addr, req, rsp, opts)
+
+	endpoint := fmt.Sprintf("%s.%s", req.Service(), req.Endpoint())
+	for _, ep := range l.opts.SkipEndpoints {
+		if ep == endpoint {
+			return err
+		}
+	}
+
+	if !l.opts.Enabled {
+		return err
+	}
+
+	var labels []string
+	for _, o := range l.opts.ClientCallFuncObservers {
+		labels = append(labels, o(ctx, addr, req, rsp, opts, err)...)
+	}
+	fields := make(map[string]interface{}, len(labels)/2)
+	for i := 0; i < len(labels); i += 2 {
+		fields[labels[i]] = labels[i+1]
+	}
+	l.opts.Logger.Fields(fields).Log(ctx, l.opts.Level)
+
+	return err
+}
+
+// NewServerHandlerWrapper accepts an options and returns a Handler Wrapper
+func NewServerHandlerWrapper(opts ...Option) server.HandlerWrapper {
+	return func(h server.HandlerFunc) server.HandlerFunc {
+		options := NewOptions()
+		for _, o := range opts {
+			o(&options)
+		}
+
+		l := &lWrapper{opts: options, serverHandler: h}
+		return l.ServerHandler
+	}
+}
+
+// NewServerSubscriberWrapper accepts an options and returns a Subscriber Wrapper
+func NewServerSubscriberWrapper(opts ...Option) server.SubscriberWrapper {
+	return func(h server.SubscriberFunc) server.SubscriberFunc {
+		options := NewOptions()
+		for _, o := range opts {
+			o(&options)
+		}
+
+		l := &lWrapper{opts: options, serverSubscriber: h}
+		return l.ServerSubscriber
+	}
+}

metadata/context.go

@@ -5,35 +5,142 @@ import (
 	"context"
 )
 
+type (
+	mdIncomingKey struct{}
+	mdOutgoingKey struct{}
+	mdKey         struct{}
+)
+
+// FromIncomingContext returns metadata from incoming ctx
+// returned metadata shoud not be modified or race condition happens
+func FromIncomingContext(ctx context.Context) (Metadata, bool) {
+	if ctx == nil {
+		return nil, false
+	}
+	md, ok := ctx.Value(mdIncomingKey{}).(*rawMetadata)
+	if !ok || md.md == nil {
+		return nil, false
+	}
+	return md.md, ok
+}
+
+// FromOutgoingContext returns metadata from outgoing ctx
+// returned metadata shoud not be modified or race condition happens
+func FromOutgoingContext(ctx context.Context) (Metadata, bool) {
+	if ctx == nil {
+		return nil, false
+	}
+	md, ok := ctx.Value(mdOutgoingKey{}).(*rawMetadata)
+	if !ok || md.md == nil {
+		return nil, false
+	}
+	return md.md, ok
+}
+
 // FromContext returns metadata from the given context
+// returned metadata shoud not be modified or race condition happens
+//
+// Deprecated: use FromIncomingContext or FromOutgoingContext
 func FromContext(ctx context.Context) (Metadata, bool) {
 	if ctx == nil {
 		return nil, false
 	}
-	md, ok := ctx.Value(metadataKey{}).(Metadata)
-	if !ok {
-		return nil, ok
+	md, ok := ctx.Value(mdKey{}).(*rawMetadata)
+	if !ok || md.md == nil {
+		return nil, false
 	}
-	nmd := Copy(md)
-	return nmd, ok
+	return md.md, ok
 }
 
 // NewContext creates a new context with the given metadata
+//
+// Deprecated: use NewIncomingContext or NewOutgoingContext
 func NewContext(ctx context.Context, md Metadata) context.Context {
 	if ctx == nil {
 		ctx = context.Background()
 	}
-	return context.WithValue(ctx, metadataKey{}, Copy(md))
+	ctx = context.WithValue(ctx, mdKey{}, &rawMetadata{md})
+	ctx = context.WithValue(ctx, mdIncomingKey{}, &rawMetadata{})
+	ctx = context.WithValue(ctx, mdOutgoingKey{}, &rawMetadata{})
+	return ctx
 }
 
-// MergeContext merges metadata to existing metadata, overwriting if specified
-func MergeContext(ctx context.Context, pmd Metadata, overwrite bool) context.Context {
+// SetOutgoingContext modify outgoing context with given metadata
+func SetOutgoingContext(ctx context.Context, md Metadata) bool {
+	if ctx == nil {
+		return false
+	}
+	if omd, ok := ctx.Value(mdOutgoingKey{}).(*rawMetadata); ok {
+		omd.md = md
+		return true
+	}
+	return false
+}
+
+// SetIncomingContext modify incoming context with given metadata
+func SetIncomingContext(ctx context.Context, md Metadata) bool {
+	if ctx == nil {
+		return false
+	}
+	if omd, ok := ctx.Value(mdIncomingKey{}).(*rawMetadata); ok {
+		omd.md = md
+		return true
+	}
+	return false
+}
+
+// NewIncomingContext creates a new context with incoming metadata attached
+func NewIncomingContext(ctx context.Context, md Metadata) context.Context {
 	if ctx == nil {
 		ctx = context.Background()
 	}
-	md, ok := FromContext(ctx)
-	if !ok {
-		return context.WithValue(ctx, metadataKey{}, Copy(pmd))
+	ctx = context.WithValue(ctx, mdIncomingKey{}, &rawMetadata{md})
+	if v, ok := ctx.Value(mdOutgoingKey{}).(*rawMetadata); !ok || v == nil {
+		ctx = context.WithValue(ctx, mdOutgoingKey{}, &rawMetadata{})
 	}
-	return context.WithValue(ctx, metadataKey{}, Merge(md, pmd, overwrite))
+	return ctx
+}
+
+// NewOutgoingContext creates a new context with outcoming metadata attached
+func NewOutgoingContext(ctx context.Context, md Metadata) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	ctx = context.WithValue(ctx, mdOutgoingKey{}, &rawMetadata{md})
+	if v, ok := ctx.Value(mdIncomingKey{}).(*rawMetadata); !ok || v == nil {
+		ctx = context.WithValue(ctx, mdIncomingKey{}, &rawMetadata{})
+	}
+	return ctx
+}
+
+// AppendOutgoingContext apends new md to context
+func AppendOutgoingContext(ctx context.Context, kv ...string) context.Context {
+	md, ok := Pairs(kv...)
+	if !ok {
+		return ctx
+	}
+	omd, ok := FromOutgoingContext(ctx)
+	if !ok {
+		return NewOutgoingContext(ctx, md)
+	}
+	for k, v := range md {
+		omd.Set(k, v)
+	}
+	return NewOutgoingContext(ctx, omd)
+}
+
+// AppendIncomingContext apends new md to context
+func AppendIncomingContext(ctx context.Context, kv ...string) context.Context {
+	md, ok := Pairs(kv...)
+	if !ok {
+		return ctx
+	}
+	omd, ok := FromIncomingContext(ctx)
+	if !ok {
+		return NewIncomingContext(ctx, md)
+	}
+	for k, v := range md {
+		omd.Set(k, v)
+	}
+	return NewIncomingContext(ctx, omd)
 }

metadata/metadata.go

@@ -2,35 +2,46 @@
 package metadata
 
 import (
-	"context"
 	"net/textproto"
 	"sort"
 )
 
 var (
-	// HeaderPrefix for all headers passed
-	HeaderPrefix = "Micro-"
+	// HeaderTopic is the header name that contains topic name
+	HeaderTopic = "Micro-Topic"
+	// HeaderContentType specifies content type of message
+	HeaderContentType = "Content-Type"
+	// HeaderEndpoint specifies endpoint in service
+	HeaderEndpoint = "Micro-Endpoint"
+	// HeaderService specifies service
+	HeaderService = "Micro-Service"
+	// HeaderTimeout specifies timeout of operation
+	HeaderTimeout = "Micro-Timeout"
+	// HeaderAuthorization specifies Authorization header
+	HeaderAuthorization = "Authorization"
 )
 
-type metadataKey struct{}
-
 // Metadata is our way of representing request headers internally.
 // They're used at the RPC level and translate back and forth
 // from Transport headers.
 type Metadata map[string]string
 
-var (
-	// DefaultMetadataSize used when need to init new Metadata
-	DefaultMetadataSize = 6
-)
-
-type Iterator struct {
-	cur  int
-	cnt  int
-	keys []string
-	md   Metadata
+type rawMetadata struct {
+	md Metadata
 }
 
+// defaultMetadataSize used when need to init new Metadata
+var defaultMetadataSize = 2
+
+// Iterator used to iterate over metadata with order
+type Iterator struct {
+	md   Metadata
+	keys []string
+	cur  int
+	cnt  int
+}
+
+// Next advance iterator to next element
 func (iter *Iterator) Next(k, v *string) bool {
 	if iter.cur+1 > iter.cnt {
 		return false
@@ -42,7 +53,7 @@ func (iter *Iterator) Next(k, v *string) bool {
 	return true
 }
 
-// Iterate returns run user func with map key, val sorted by key
+// Iterator returns the itarator for metadata in sorted order
 func (md Metadata) Iterator() *Iterator {
 	iter := &Iterator{md: md, cnt: len(md)}
 	iter.keys = make([]string, 0, iter.cnt)
@@ -72,12 +83,9 @@ func (md Metadata) Set(key, val string) {
 // Del is used to remove value from metadata
 func (md Metadata) Del(key string) {
 	// fast path
-	if _, ok := md[key]; ok {
-		delete(md, key)
-	} else {
-		// slow path
-		delete(md, textproto.CanonicalMIMEHeaderKey(key))
-	}
+	delete(md, key)
+	// slow path
+	delete(md, textproto.CanonicalMIMEHeaderKey(key))
 }
 
 // Copy makes a copy of the metadata
@@ -89,54 +97,45 @@ func Copy(md Metadata) Metadata {
 	return nmd
 }
 
-// Del deletes key from metadata
-func Del(ctx context.Context, key string) context.Context {
-	md, ok := FromContext(ctx)
-	if !ok {
-		md = New(0)
-	}
-	md.Del(key)
-	return context.WithValue(ctx, metadataKey{}, md)
-}
-
-// Set add key with val to metadata
-func Set(ctx context.Context, key, val string) context.Context {
-	md, ok := FromContext(ctx)
-	if !ok {
-		md = New(0)
-	}
-	md.Set(key, val)
-	return context.WithValue(ctx, metadataKey{}, md)
-}
-
-// Get returns a single value from metadata in the context
-func Get(ctx context.Context, key string) (string, bool) {
-	md, ok := FromContext(ctx)
-	if !ok {
-		return "", ok
-	}
-	return md.Get(key)
-}
-
 // New return new sized metadata
 func New(size int) Metadata {
 	if size == 0 {
-		size = DefaultMetadataSize
+		size = defaultMetadataSize
 	}
 	return make(Metadata, size)
 }
 
 // Merge merges metadata to existing metadata, overwriting if specified
 func Merge(omd Metadata, mmd Metadata, overwrite bool) Metadata {
+	var ok bool
 	nmd := Copy(omd)
 	for key, val := range mmd {
-		if _, ok := nmd[key]; ok && !overwrite {
-			// skip
-		} else if val != "" {
+		_, ok = nmd[key]
+		switch {
+		case ok && !overwrite:
+			continue
+		case val != "":
 			nmd.Set(key, val)
-		} else {
+		case ok && val == "":
 			nmd.Del(key)
 		}
 	}
 	return nmd
 }
+
+// Pairs from which metadata created
+func Pairs(kv ...string) (Metadata, bool) {
+	if len(kv)%2 == 1 {
+		return nil, false
+	}
+	md := New(len(kv) / 2)
+	var k string
+	for i, v := range kv {
+		if i%2 == 0 {
+			k = v
+			continue
+		}
+		md.Set(k, v)
+	}
+	return md, true
+}

metadata/metadata_test.go

@@ -2,11 +2,55 @@ package metadata
 
 import (
 	"context"
-	"fmt"
-	"reflect"
 	"testing"
 )
 
+func TestAppend(t *testing.T) {
+	ctx := context.Background()
+	ctx = AppendIncomingContext(ctx, "key1", "val1", "key2", "val2")
+	md, ok := FromIncomingContext(ctx)
+	if !ok {
+		t.Fatal("metadata empty")
+	}
+	if _, ok := md.Get("key1"); !ok {
+		t.Fatal("key1 not found")
+	}
+}
+
+func TestPairs(t *testing.T) {
+	md, ok := Pairs("key1", "val1", "key2", "val2")
+	if !ok {
+		t.Fatal("odd number of kv")
+	}
+	if _, ok = md.Get("key1"); !ok {
+		t.Fatal("key1 not found")
+	}
+}
+
+func testCtx(ctx context.Context) {
+	md := New(2)
+	md.Set("Key1", "Val1_new")
+	md.Set("Key3", "Val3")
+	SetOutgoingContext(ctx, md)
+}
+
+func TestPassing(t *testing.T) {
+	ctx := context.TODO()
+	md1 := New(2)
+	md1.Set("Key1", "Val1")
+	md1.Set("Key2", "Val2")
+
+	ctx = NewIncomingContext(ctx, md1)
+	testCtx(ctx)
+	md, ok := FromOutgoingContext(ctx)
+	if !ok {
+		t.Fatalf("missing metadata from outgoing context")
+	}
+	if v, ok := md.Get("Key1"); !ok || v != "Val1_new" {
+		t.Fatalf("invalid metadata value %#+v", md)
+	}
+}
+
 func TestMerge(t *testing.T) {
 	omd := Metadata{
 		"key1": "val1",
@@ -32,38 +76,40 @@ func TestIterator(t *testing.T) {
 	var k, v string
 
 	for iter.Next(&k, &v) {
-		fmt.Printf("k: %s, v: %s\n", k, v)
+		// fmt.Printf("k: %s, v: %s\n", k, v)
 	}
 }
 
 func TestMedataCanonicalKey(t *testing.T) {
-	ctx := Set(context.TODO(), "x-request-id", "12345")
-	v, ok := Get(ctx, "x-request-id")
+	md := New(1)
+	md.Set("x-request-id", "12345")
+	v, ok := md.Get("x-request-id")
 	if !ok {
 		t.Fatalf("failed to get x-request-id")
 	} else if v != "12345" {
 		t.Fatalf("invalid metadata value: %s != %s", "12345", v)
 	}
 
-	v, ok = Get(ctx, "X-Request-Id")
+	v, ok = md.Get("X-Request-Id")
 	if !ok {
 		t.Fatalf("failed to get x-request-id")
 	} else if v != "12345" {
 		t.Fatalf("invalid metadata value: %s != %s", "12345", v)
 	}
-	v, ok = Get(ctx, "X-Request-ID")
+	v, ok = md.Get("X-Request-ID")
 	if !ok {
 		t.Fatalf("failed to get x-request-id")
 	} else if v != "12345" {
 		t.Fatalf("invalid metadata value: %s != %s", "12345", v)
 	}
-
 }
 
 func TestMetadataSet(t *testing.T) {
-	ctx := Set(context.TODO(), "Key", "val")
+	md := New(1)
 
-	val, ok := Get(ctx, "Key")
+	md.Set("Key", "val")
+
+	val, ok := md.Get("Key")
 	if !ok {
 		t.Fatal("key Key not found")
 	}
@@ -78,19 +124,11 @@ func TestMetadataDelete(t *testing.T) {
 		"Baz": "empty",
 	}
 
-	ctx := NewContext(context.TODO(), md)
-	ctx = Del(ctx, "Baz")
-
-	emd, ok := FromContext(ctx)
-	if !ok {
-		t.Fatal("key Key not found")
-	}
-
-	_, ok = emd["Baz"]
+	md.Del("Baz")
+	_, ok := md.Get("Baz")
 	if ok {
 		t.Fatal("key Baz not deleted")
 	}
-
 }
 
 func TestNilContext(t *testing.T) {
@@ -137,42 +175,3 @@ func TestMetadataContext(t *testing.T) {
 		t.Errorf("Expected metadata length 1 got %d", i)
 	}
 }
-
-func TestMergeContext(t *testing.T) {
-	type args struct {
-		existing  Metadata
-		append    Metadata
-		overwrite bool
-	}
-	tests := []struct {
-		name string
-		args args
-		want Metadata
-	}{
-		{
-			name: "matching key, overwrite false",
-			args: args{
-				existing:  Metadata{"Foo": "bar", "Sumo": "demo"},
-				append:    Metadata{"Sumo": "demo2"},
-				overwrite: false,
-			},
-			want: Metadata{"Foo": "bar", "Sumo": "demo"},
-		},
-		{
-			name: "matching key, overwrite true",
-			args: args{
-				existing:  Metadata{"Foo": "bar", "Sumo": "demo"},
-				append:    Metadata{"Sumo": "demo2"},
-				overwrite: true,
-			},
-			want: Metadata{"Foo": "bar", "Sumo": "demo2"},
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			if got, _ := FromContext(MergeContext(NewContext(context.TODO(), tt.args.existing), tt.args.append, tt.args.overwrite)); !reflect.DeepEqual(got, tt.want) {
-				t.Errorf("MergeContext() = %v, want %v", got, tt.want)
-			}
-		})
-	}
-}

meter/generate.go

@@ -0,0 +1,12 @@
+package meter
+
+//go:generate sh -c "protoc -I./handler -I../ -I$(go list -f '{{ .Dir }}' -m github.com/unistack-org/micro-proto) --go-micro_out='components=micro|http|server',standalone=false,debug=true,paths=source_relative:./handler handler/handler.proto"
+
+import (
+
+	// import required packages
+	_ "github.com/unistack-org/micro-proto/api"
+
+	// import required packages
+	_ "github.com/unistack-org/micro-proto/openapiv2"
+)

meter/handler/handler.go

@@ -0,0 +1,67 @@
+package handler
+
+import (
+	"bytes"
+	"context"
+
+	"github.com/unistack-org/micro/v3/codec"
+	"github.com/unistack-org/micro/v3/errors"
+	"github.com/unistack-org/micro/v3/meter"
+)
+
+// guard to fail early
+var _ MeterServer = &Handler{}
+
+type Handler struct {
+	opts Options
+}
+
+type Option func(*Options)
+
+type Options struct {
+	Meter        meter.Meter
+	Name         string
+	MeterOptions []meter.Option
+}
+
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
+func Name(name string) Option {
+	return func(o *Options) {
+		o.Name = name
+	}
+}
+
+func MeterOptions(opts ...meter.Option) Option {
+	return func(o *Options) {
+		o.MeterOptions = append(o.MeterOptions, opts...)
+	}
+}
+
+func NewOptions(opts ...Option) Options {
+	options := Options{Meter: meter.DefaultMeter}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}
+
+func NewHandler(opts ...Option) *Handler {
+	options := NewOptions(opts...)
+	return &Handler{opts: options}
+}
+
+func (h *Handler) Metrics(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error {
+	buf := bytes.NewBuffer(nil)
+	if err := h.opts.Meter.Write(buf, h.opts.MeterOptions...); err != nil {
+		return errors.InternalServerError(h.opts.Name, "%v", err)
+	}
+
+	rsp.Data = buf.Bytes()
+
+	return nil
+}

meter/handler/handler.proto

@@ -0,0 +1,28 @@
+syntax = "proto3";
+
+package micro.meter.handler;
+option go_package = "github.com/unistack-org/micro/v3/meter/handler;handler";
+
+import "api/annotations.proto";
+import "openapiv2/annotations.proto";
+import "codec/frame.proto";
+
+service Meter {
+	rpc Metrics(micro.codec.Frame) returns (micro.codec.Frame) {
+		option (micro.openapiv2.openapiv2_operation) = {
+      operation_id: "Metrics";
+      responses: {
+        response_code: {
+          name: "default";
+          value: {
+            json_reference: {
+              description: "Error response";
+              _ref: "micro.codec.Frame";
+            };
+          };
+        };
+      };
+    };
+		option (micro.api.http) = { get: "/metrics"; };
+  };
+};