meter/handler: more idiomatic option handling

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

.github/renovate.json

@@ -0,0 +1,20 @@
+{
+  "extends": [
+    "config:base"
+  ],
+  "postUpdateOptions": ["gomodTidy"],
+  "packageRules": [
+    {
+      "matchUpdateTypes": ["minor", "patch", "pin", "digest"],
+      "automerge": true
+    },
+    {
+      "groupName": "all deps",
+      "separateMajorMinor": true,
+      "groupSlug": "all",
+      "packagePatterns": [
+        "*"
+      ]
+    }
+  ]
+}

.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:
@@ -49,7 +49,7 @@ 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.

.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
@@ -49,7 +49,7 @@ 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.

.golangci.yml

@@ -1,8 +1,6 @@
 run:
   deadline: 5m
   modules-download-mode: readonly
-  skip-dirs:
-    - util/mdns.new
   skip-files:
     - ".*\\.pb\\.go$"
     - ".*\\.pb\\.micro\\.go$"
@@ -30,11 +28,3 @@ linters:
     - 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

api/api.go

@@ -6,10 +6,11 @@ import (
 	"strings"
 
 	"github.com/unistack-org/micro/v3/metadata"
-	"github.com/unistack-org/micro/v3/registry"
+	"github.com/unistack-org/micro/v3/register"
 	"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
 }
@@ -53,26 +56,10 @@ 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 []*registry.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
+	// Services that provides service
+	Services []*register.Service
 }
 
 // Encode encodes an endpoint to endpoint metadata
@@ -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,

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/registry"
-)
-
-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([]*registry.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/registry"
-	"github.com/unistack-org/micro/v3/registry"
-	"github.com/unistack-org/micro/v3/registry/memory"
-)
-
-func testHttp(t *testing.T, path, service, ns string) {
-	r := memory.NewRegistry()
-
-	l, err := net.Listen("tcp", "127.0.0.1:0")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer l.Close()
-
-	s := &registry.Service{
-		Name: service,
-		Nodes: []*registry.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.WithRegistry(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 +3,34 @@ 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 specifies max recv size for handler
 	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 +40,6 @@ func NewOptions(opts ...Option) Options {
 		WithNamespace("go.micro.api")(&options)
 	}
 
-	if options.MaxRecvSize == 0 {
-		options.MaxRecvSize = DefaultMaxRecvSize
-	}
-
 	return options
 }
 
@@ -51,6 +57,7 @@ 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/registry"
-)
-
-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([]*registry.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 {
-		return x.Get
-	}
-	return nil
-}
-
-func (x *Request) GetPost() map[string]*Pair {
-	if x != nil {
-		return x.Post
-	}
-	return nil
-}
-
-func (x *Request) GetBody() string {
-	if x != nil {
-		return x.Body
-	}
-	return ""
-}
-
-func (x *Request) GetUrl() string {
-	if x != nil {
-		return x.Url
-	}
-	return ""
-}
-
-// A HTTP response as RPC
-// Expected response for the api handler
-type Response struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	StatusCode int32            `protobuf:"varint,1,opt,name=statusCode,proto3" json:"statusCode,omitempty"`
-	Header     map[string]*Pair `protobuf:"bytes,2,rep,name=header,proto3" json:"header,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	Body       string           `protobuf:"bytes,3,opt,name=body,proto3" json:"body,omitempty"`
-}
-
-func (x *Response) Reset() {
-	*x = Response{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_api_proto_api_proto_msgTypes[2]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *Response) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*Response) ProtoMessage() {}
-
-func (x *Response) ProtoReflect() protoreflect.Message {
-	mi := &file_api_proto_api_proto_msgTypes[2]
-	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 Response.ProtoReflect.Descriptor instead.
-func (*Response) Descriptor() ([]byte, []int) {
-	return file_api_proto_api_proto_rawDescGZIP(), []int{2}
-}
-
-func (x *Response) GetStatusCode() int32 {
-	if x != nil {
-		return x.StatusCode
-	}
-	return 0
-}
-
-func (x *Response) GetHeader() map[string]*Pair {
-	if x != nil {
-		return x.Header
-	}
-	return nil
-}
-
-func (x *Response) GetBody() string {
-	if x != nil {
-		return x.Body
-	}
-	return ""
-}
-
-// A HTTP event as RPC
-// Forwarded by the event handler
-type Event struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// e.g login
-	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	// uuid
-	Id string `protobuf:"bytes,2,opt,name=id,proto3" json:"id,omitempty"`
-	// unix timestamp of event
-	Timestamp int64 `protobuf:"varint,3,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
-	// event headers
-	Header map[string]*Pair `protobuf:"bytes,4,rep,name=header,proto3" json:"header,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	// the event data
-	Data string `protobuf:"bytes,5,opt,name=data,proto3" json:"data,omitempty"`
-}
-
-func (x *Event) Reset() {
-	*x = Event{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_api_proto_api_proto_msgTypes[3]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *Event) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*Event) ProtoMessage() {}
-
-func (x *Event) ProtoReflect() protoreflect.Message {
-	mi := &file_api_proto_api_proto_msgTypes[3]
-	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 Event.ProtoReflect.Descriptor instead.
-func (*Event) Descriptor() ([]byte, []int) {
-	return file_api_proto_api_proto_rawDescGZIP(), []int{3}
-}
-
-func (x *Event) GetName() string {
-	if x != nil {
-		return x.Name
-	}
-	return ""
-}
-
-func (x *Event) GetId() string {
-	if x != nil {
-		return x.Id
-	}
-	return ""
-}
-
-func (x *Event) GetTimestamp() int64 {
-	if x != nil {
-		return x.Timestamp
-	}
-	return 0
-}
-
-func (x *Event) GetHeader() map[string]*Pair {
-	if x != nil {
-		return x.Header
-	}
-	return nil
-}
-
-func (x *Event) GetData() string {
-	if x != nil {
-		return x.Data
-	}
-	return ""
-}
-
-var File_api_proto_api_proto protoreflect.FileDescriptor
-
-var file_api_proto_api_proto_rawDesc = []byte{
-	0x0a, 0x13, 0x61, 0x70, 0x69, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x61, 0x70, 0x69, 0x2e,
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-	0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
-}
-
-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{} {
-			switch v := v.(*Response); 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[3].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Event); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-	}
-	type x struct{}
-	out := protoimpl.TypeBuilder{
-		File: protoimpl.DescBuilder{
-			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: file_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

@@ -3,14 +3,17 @@ package resolver
 import (
 	"context"
 
-	"github.com/unistack-org/micro/v3/registry"
+	"github.com/unistack-org/micro/v3/register"
 )
 
 // 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
@@ -58,7 +61,7 @@ func Domain(n string) ResolveOption {
 
 // NewResolveOptions returns new initialised resolve options
 func NewResolveOptions(opts ...ResolveOption) ResolveOptions {
-	options := ResolveOptions{Domain: registry.DefaultDomain}
+	options := ResolveOptions{Domain: register.DefaultDomain}
 	for _, o := range opts {
 		o(&options)
 	}

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{options, parent}
 }
 
-type Resolver struct {
+type subdomainResolver struct {
 	opts resolver.Options
 	resolver.Resolver
 }
 
-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

@@ -10,11 +10,12 @@ 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
 }
 
@@ -22,7 +23,8 @@ 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 +62,12 @@ 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

@@ -5,18 +5,28 @@ import (
 
 	"github.com/unistack-org/micro/v3/api/resolver"
 	"github.com/unistack-org/micro/v3/api/resolver/vpath"
-	"github.com/unistack-org/micro/v3/registry"
+	"github.com/unistack-org/micro/v3/logger"
+	"github.com/unistack-org/micro/v3/register"
 )
 
+// Options holds the options for api router
 type Options struct {
-	Handler  string
-	Registry registry.Registry
+	// Register for service lookup
+	Register register.Register
+	// Resolver to use
 	Resolver resolver.Resolver
-	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(),
@@ -50,10 +60,10 @@ func WithHandler(h string) Option {
 	}
 }
 
-// WithRegistry sets the registry
-func WithRegistry(r registry.Registry) Option {
+// WithRegister sets the register
+func WithRegister(r register.Register) Option {
 	return func(o *Options) {
-		o.Registry = r
+		o.Register = r
 	}
 }
 

api/router/router.go

@@ -7,6 +7,11 @@ import (
 	"github.com/unistack-org/micro/v3/api"
 )
 
+var (
+	// DefaultRouter contains default router implementation
+	DefaultRouter Router
+)
+
 // Router is used to determine an endpoint for a request
 type Router interface {
 	// Returns options
@@ -23,6 +28,6 @@ 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
 }

api/server/acme/acme.go

@@ -1,29 +0,0 @@
-// Package acme abstracts away various ACME libraries
-package acme
-
-import (
-	"crypto/tls"
-	"errors"
-	"net"
-)
-
-var (
-	// ErrProviderNotImplemented can be returned when attempting to
-	// instantiate an unimplemented provider
-	ErrProviderNotImplemented = errors.New("Provider not implemented")
-)
-
-// Provider is a ACME provider interface
-type Provider interface {
-	Init(...Option) error
-	// Listen returns a new listener
-	Listen(...string) (net.Listener, error)
-	// TLSConfig returns a tls config
-	TLSConfig(...string) (*tls.Config, error)
-}
-
-// The Let's Encrypt ACME endpoints
-const (
-	LetsEncryptStagingCA    = "https://acme-staging-v02.api.letsencrypt.org/directory"
-	LetsEncryptProductionCA = "https://acme-v02.api.letsencrypt.org/directory"
-)

api/server/acme/autocert/autocert.go

@@ -1,53 +0,0 @@
-// Package autocert is the ACME provider from golang.org/x/crypto/acme/autocert
-// This provider does not take any config.
-package autocert
-
-import (
-	"crypto/tls"
-	"net"
-	"os"
-
-	"github.com/unistack-org/micro/v3/api/server"
-	"github.com/unistack-org/micro/v3/api/server/acme"
-	"github.com/unistack-org/micro/v3/logger"
-	"golang.org/x/crypto/acme/autocert"
-)
-
-// autoCertACME is the ACME provider from golang.org/x/crypto/acme/autocert
-type autocertProvider struct {
-	opts server.Options
-}
-
-func (a *autocertProvider) Init(opts ...acme.Option) error {
-	return nil
-}
-
-// Listen implements acme.Provider
-func (a *autocertProvider) Listen(hosts ...string) (net.Listener, error) {
-	return autocert.NewListener(hosts...), nil
-}
-
-// TLSConfig returns a new tls config
-func (a *autocertProvider) TLSConfig(hosts ...string) (*tls.Config, error) {
-	// create a new manager
-	m := &autocert.Manager{
-		Prompt: autocert.AcceptTOS,
-	}
-	if len(hosts) > 0 {
-		m.HostPolicy = autocert.HostWhitelist(hosts...)
-	}
-	dir := cacheDir()
-	if err := os.MkdirAll(dir, 0700); err != nil {
-		if logger.V(logger.InfoLevel) {
-			logger.Info(a.opts.Context, "warning: autocert not using a cache: %v", err)
-		}
-	} else {
-		m.Cache = autocert.DirCache(dir)
-	}
-	return m.TLSConfig(), nil
-}
-
-// New returns an autocert acme.Provider
-func NewProvider() acme.Provider {
-	return &autocertProvider{}
-}

api/server/acme/autocert/autocert_test.go

@@ -1,16 +0,0 @@
-package autocert
-
-import (
-	"testing"
-)
-
-func TestAutocert(t *testing.T) {
-	l := NewProvider()
-	if _, ok := l.(*autocertProvider); !ok {
-		t.Error("NewProvider() didn't return an autocertProvider")
-	}
-	// TODO: Travis CI doesn't let us bind :443
-	// if _, err := l.NewListener(); err != nil {
-	// 	t.Error(err.Error())
-	// }
-}

api/server/acme/autocert/cache.go

@@ -1,37 +0,0 @@
-package autocert
-
-import (
-	"os"
-	"path/filepath"
-	"runtime"
-)
-
-func homeDir() string {
-	if runtime.GOOS == "windows" {
-		return os.Getenv("HOMEDRIVE") + os.Getenv("HOMEPATH")
-	}
-	if h := os.Getenv("HOME"); h != "" {
-		return h
-	}
-	return "/"
-}
-
-func cacheDir() string {
-	const base = "golang-autocert"
-	switch runtime.GOOS {
-	case "darwin":
-		return filepath.Join(homeDir(), "Library", "Caches", base)
-	case "windows":
-		for _, ev := range []string{"APPDATA", "CSIDL_APPDATA", "TEMP", "TMP"} {
-			if v := os.Getenv(ev); v != "" {
-				return filepath.Join(v, base)
-			}
-		}
-		// Worst case:
-		return filepath.Join(homeDir(), base)
-	}
-	if xdg := os.Getenv("XDG_CACHE_HOME"); xdg != "" {
-		return filepath.Join(xdg, base)
-	}
-	return filepath.Join(homeDir(), ".cache", base)
-}

api/server/acme/certmagic/certmagic.go

@@ -1,71 +0,0 @@
-// Package certmagic is the ACME provider from github.com/caddyserver/certmagic
-package certmagic
-
-import (
-	"crypto/tls"
-	"fmt"
-	"math/rand"
-	"net"
-	"time"
-
-	"github.com/caddyserver/certmagic"
-	"github.com/unistack-org/micro/v3/api/server/acme"
-)
-
-type certmagicProvider struct {
-	opts acme.Options
-}
-
-// TODO: set self-contained options
-func (c *certmagicProvider) setup() {
-	certmagic.DefaultACME.CA = c.opts.CA
-	if c.opts.ChallengeProvider != nil {
-		// Enabling DNS Challenge disables the other challenges
-		certmagic.DefaultACME.DNSProvider = c.opts.ChallengeProvider
-	}
-	if c.opts.OnDemand {
-		certmagic.Default.OnDemand = new(certmagic.OnDemandConfig)
-	}
-	if c.opts.Cache != nil {
-		// already validated by new()
-		certmagic.Default.Storage = c.opts.Cache.(certmagic.Storage)
-	}
-	// If multiple instances of the provider are running, inject some
-	// randomness so they don't collide
-	// RenewalWindowRatio [0.33 - 0.50)
-	rand.Seed(time.Now().UnixNano())
-	randomRatio := float64(rand.Intn(17)+33) * 0.01
-	certmagic.Default.RenewalWindowRatio = randomRatio
-}
-
-func (c *certmagicProvider) Listen(hosts ...string) (net.Listener, error) {
-	c.setup()
-	return certmagic.Listen(hosts)
-}
-
-func (c *certmagicProvider) TLSConfig(hosts ...string) (*tls.Config, error) {
-	c.setup()
-	return certmagic.TLS(hosts)
-}
-
-func (p *certmagicProvider) Init(opts ...acme.Option) error {
-	if p.opts.Cache != nil {
-		if _, ok := p.opts.Cache.(certmagic.Storage); !ok {
-			return fmt.Errorf("ACME: cache provided doesn't implement certmagic's Storage interface")
-		}
-	}
-	return nil
-}
-
-// NewProvider returns a certmagic provider
-func NewProvider(options ...acme.Option) acme.Provider {
-	opts := acme.DefaultOptions()
-
-	for _, o := range options {
-		o(&opts)
-	}
-
-	return &certmagicProvider{
-		opts: opts,
-	}
-}

api/server/acme/certmagic/storage.go

@@ -1,138 +0,0 @@
-package certmagic
-
-import (
-	"bytes"
-	"encoding/gob"
-	"errors"
-	"path"
-	"strings"
-	"time"
-
-	"github.com/caddyserver/certmagic"
-	"github.com/unistack-org/micro/v3/store"
-	"github.com/unistack-org/micro/v3/sync"
-)
-
-// File represents a "File" that will be stored in store.Store - the contents and last modified time
-type File struct {
-	// last modified time
-	LastModified time.Time
-	// Contents
-	Contents []byte
-}
-
-// storage is an implementation of certmagic.Storage using micro's sync.Map and store.Store interfaces.
-// As certmagic storage expects a filesystem (with stat() abilities) we have to implement
-// the bare minimum of metadata.
-type storage struct {
-	lock  sync.Sync
-	store store.Store
-}
-
-func (s *storage) Lock(key string) error {
-	return s.lock.Lock(key, sync.LockTTL(10*time.Minute))
-}
-
-func (s *storage) Unlock(key string) error {
-	return s.lock.Unlock(key)
-}
-
-func (s *storage) Store(key string, value []byte) error {
-	f := File{
-		LastModified: time.Now(),
-		Contents:     value,
-	}
-	buf := &bytes.Buffer{}
-	e := gob.NewEncoder(buf)
-	if err := e.Encode(f); err != nil {
-		return err
-	}
-	return s.store.Write(s.store.Options().Context, key, buf.Bytes())
-}
-
-func (s *storage) Load(key string) ([]byte, error) {
-	if !s.Exists(key) {
-		return nil, certmagic.ErrNotExist(errors.New(key + " doesn't exist"))
-	}
-	var val []byte
-	err := s.store.Read(s.store.Options().Context, key, val)
-	if err != nil {
-		return nil, err
-	}
-	b := bytes.NewBuffer(val)
-	d := gob.NewDecoder(b)
-	var f File
-	err = d.Decode(&f)
-	if err != nil {
-		return nil, err
-	}
-	return f.Contents, nil
-}
-
-func (s *storage) Delete(key string) error {
-	return s.store.Delete(s.store.Options().Context, key)
-}
-
-func (s *storage) Exists(key string) bool {
-	if err := s.store.Read(s.store.Options().Context, key, nil); err != nil {
-		return false
-	}
-	return true
-}
-
-func (s *storage) List(prefix string, recursive bool) ([]string, error) {
-	keys, err := s.store.List(s.store.Options().Context)
-	if err != nil {
-		return nil, err
-	}
-
-	//nolint:prealloc
-	var results []string
-	for _, k := range keys {
-		if strings.HasPrefix(k, prefix) {
-			results = append(results, k)
-		}
-	}
-	if recursive {
-		return results, nil
-	}
-	keysMap := make(map[string]bool)
-	for _, key := range results {
-		dir := strings.Split(strings.TrimPrefix(key, prefix+"/"), "/")
-		keysMap[dir[0]] = true
-	}
-	results = make([]string, 0)
-	for k := range keysMap {
-		results = append(results, path.Join(prefix, k))
-	}
-	return results, nil
-}
-
-func (s *storage) Stat(key string) (certmagic.KeyInfo, error) {
-	var val []byte
-	err := s.store.Read(s.store.Options().Context, key, val)
-	if err != nil {
-		return certmagic.KeyInfo{}, err
-	}
-	b := bytes.NewBuffer(val)
-	d := gob.NewDecoder(b)
-	var f File
-	err = d.Decode(&f)
-	if err != nil {
-		return certmagic.KeyInfo{}, err
-	}
-	return certmagic.KeyInfo{
-		Key:        key,
-		Modified:   f.LastModified,
-		Size:       int64(len(f.Contents)),
-		IsTerminal: false,
-	}, nil
-}
-
-// NewStorage returns a certmagic.Storage backed by a micro/lock and micro/store
-func NewStorage(lock sync.Sync, store store.Store) certmagic.Storage {
-	return &storage{
-		lock:  lock,
-		store: store,
-	}
-}

api/server/acme/options.go

@@ -1,73 +0,0 @@
-package acme
-
-import "github.com/go-acme/lego/v3/challenge"
-
-// Option (or Options) are passed to New() to configure providers
-type Option func(o *Options)
-
-// Options represents various options you can present to ACME providers
-type Options struct {
-	// AcceptTLS must be set to true to indicate that you have read your
-	// provider's terms of service.
-	AcceptToS bool
-	// CA is the CA to use
-	CA string
-	// ChallengeProvider is a go-acme/lego challenge provider. Set this if you
-	// want to use DNS Challenges. Otherwise, tls-alpn-01 will be used
-	ChallengeProvider challenge.Provider
-	// Issue certificates for domains on demand. Otherwise, certs will be
-	// retrieved / issued on start-up.
-	OnDemand bool
-	// Cache is a storage interface. Most ACME libraries have an cache, but
-	// there's no defined interface, so if you consume this option
-	// sanity check it before using.
-	Cache interface{}
-}
-
-// AcceptToS indicates whether you accept your CA's terms of service
-func AcceptToS(b bool) Option {
-	return func(o *Options) {
-		o.AcceptToS = b
-	}
-}
-
-// CA sets the CA of an acme.Options
-func CA(CA string) Option {
-	return func(o *Options) {
-		o.CA = CA
-	}
-}
-
-// ChallengeProvider sets the Challenge provider of an acme.Options
-// if set, it enables the DNS challenge, otherwise tls-alpn-01 will be used.
-func ChallengeProvider(p challenge.Provider) Option {
-	return func(o *Options) {
-		o.ChallengeProvider = p
-	}
-}
-
-// OnDemand enables on-demand certificate issuance. Not recommended for use
-// with the DNS challenge, as the first connection may be very slow.
-func OnDemand(b bool) Option {
-	return func(o *Options) {
-		o.OnDemand = b
-	}
-}
-
-// Cache provides a cache / storage interface to the underlying ACME library
-// as there is no standard, this needs to be validated by the underlying
-// implementation
-func Cache(c interface{}) Option {
-	return func(o *Options) {
-		o.Cache = c
-	}
-}
-
-// DefaultOptions uses the Let's Encrypt Production CA, with DNS Challenge disabled.
-func DefaultOptions() Options {
-	return Options{
-		AcceptToS: true,
-		CA:        LetsEncryptProductionCA,
-		OnDemand:  true,
-	}
-}

api/server/cors/cors.go

@@ -1,44 +0,0 @@
-package cors
-
-import (
-	"net/http"
-)
-
-// CombinedCORSHandler wraps a server and provides CORS headers
-func CombinedCORSHandler(h http.Handler) http.Handler {
-	return corsHandler{h}
-}
-
-type corsHandler struct {
-	handler http.Handler
-}
-
-func (c corsHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	SetHeaders(w, r)
-
-	if r.Method == "OPTIONS" {
-		return
-	}
-
-	c.handler.ServeHTTP(w, r)
-}
-
-// SetHeaders sets the CORS headers
-func SetHeaders(w http.ResponseWriter, r *http.Request) {
-	set := func(w http.ResponseWriter, k, v string) {
-		if v := w.Header().Get(k); len(v) > 0 {
-			return
-		}
-		w.Header().Set(k, v)
-	}
-
-	if origin := r.Header.Get("Origin"); len(origin) > 0 {
-		set(w, "Access-Control-Allow-Origin", origin)
-	} else {
-		set(w, "Access-Control-Allow-Origin", "*")
-	}
-
-	set(w, "Access-Control-Allow-Credentials", "true")
-	set(w, "Access-Control-Allow-Methods", "POST, PATCH, GET, OPTIONS, PUT, DELETE")
-	set(w, "Access-Control-Allow-Headers", "Accept, Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization")
-}

api/server/http/http.go

@@ -1,110 +0,0 @@
-// Package http provides a http server with features; acme, cors, etc
-package http
-
-import (
-	"crypto/tls"
-	"net"
-	"net/http"
-	"sync"
-
-	"github.com/unistack-org/micro/v3/api/server"
-	"github.com/unistack-org/micro/v3/logger"
-)
-
-type httpServer struct {
-	mux  *http.ServeMux
-	opts server.Options
-
-	sync.RWMutex
-	address string
-	exit    chan chan error
-}
-
-func NewServer(address string, opts ...server.Option) server.Server {
-	return &httpServer{
-		opts:    server.NewOptions(opts...),
-		mux:     http.NewServeMux(),
-		address: address,
-		exit:    make(chan chan error),
-	}
-}
-
-func (s *httpServer) Address() string {
-	s.RLock()
-	defer s.RUnlock()
-	return s.address
-}
-
-func (s *httpServer) Init(opts ...server.Option) error {
-	for _, o := range opts {
-		o(&s.opts)
-	}
-	return nil
-}
-
-func (s *httpServer) Handle(path string, handler http.Handler) {
-	// TODO: move this stuff out to one place with ServeHTTP
-
-	// apply the wrappers, e.g. auth
-	for _, wrapper := range s.opts.Wrappers {
-		handler = wrapper(handler)
-	}
-
-	s.mux.Handle(path, handler)
-}
-
-func (s *httpServer) Start() error {
-	var l net.Listener
-	var err error
-
-	s.RLock()
-	config := s.opts
-	s.RUnlock()
-	if s.opts.EnableACME && s.opts.ACMEProvider != nil {
-		// should we check the address to make sure its using :443?
-		l, err = s.opts.ACMEProvider.Listen(s.opts.ACMEHosts...)
-	} else if s.opts.EnableTLS && s.opts.TLSConfig != nil {
-		l, err = tls.Listen("tcp", s.address, s.opts.TLSConfig)
-	} else {
-		// otherwise plain listen
-		l, err = net.Listen("tcp", s.address)
-	}
-	if err != nil {
-		return err
-	}
-
-	if config.Logger.V(logger.InfoLevel) {
-		config.Logger.Infof(s.opts.Context, "HTTP API Listening on %s", l.Addr().String())
-	}
-
-	s.Lock()
-	s.address = l.Addr().String()
-	s.Unlock()
-
-	go func() {
-		if err := http.Serve(l, s.mux); err != nil {
-			// temporary fix
-			if config.Logger.V(logger.ErrorLevel) {
-				config.Logger.Errorf(s.opts.Context, "serve err: %v", err)
-			}
-			s.Stop()
-		}
-	}()
-
-	go func() {
-		ch := <-s.exit
-		ch <- l.Close()
-	}()
-
-	return nil
-}
-
-func (s *httpServer) Stop() error {
-	ch := make(chan error)
-	s.exit <- ch
-	return <-ch
-}
-
-func (s *httpServer) String() string {
-	return "http"
-}

api/server/http/http_test.go

@@ -1,41 +0,0 @@
-package http
-
-import (
-	"fmt"
-	"io/ioutil"
-	"net/http"
-	"testing"
-)
-
-func TestHTTPServer(t *testing.T) {
-	testResponse := "hello world"
-
-	s := NewServer("localhost:0")
-
-	s.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		fmt.Fprint(w, testResponse)
-	}))
-
-	if err := s.Start(); err != nil {
-		t.Fatal(err)
-	}
-
-	rsp, err := http.Get(fmt.Sprintf("http://%s/", s.Address()))
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer rsp.Body.Close()
-
-	b, err := ioutil.ReadAll(rsp.Body)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	if string(b) != testResponse {
-		t.Fatalf("Unexpected response, got %s, expected %s", string(b), testResponse)
-	}
-
-	if err := s.Stop(); err != nil {
-		t.Fatal(err)
-	}
-}

api/server/options.go

@@ -1,96 +0,0 @@
-package server
-
-import (
-	"context"
-	"crypto/tls"
-	"net/http"
-
-	"github.com/unistack-org/micro/v3/api/resolver"
-	"github.com/unistack-org/micro/v3/api/server/acme"
-	"github.com/unistack-org/micro/v3/logger"
-)
-
-// Option func
-type Option func(o *Options)
-
-// Options for api server
-type Options struct {
-	EnableACME   bool
-	EnableCORS   bool
-	ACMEProvider acme.Provider
-	EnableTLS    bool
-	ACMEHosts    []string
-	TLSConfig    *tls.Config
-	Resolver     resolver.Resolver
-	Wrappers     []Wrapper
-	Logger       logger.Logger
-	Context      context.Context
-}
-
-// NewOptions returns new Options
-func NewOptions(opts ...Option) Options {
-	options := Options{
-		Logger:  logger.DefaultLogger,
-		Context: context.Background(),
-	}
-	for _, o := range opts {
-		o(&options)
-	}
-	return options
-}
-
-type Wrapper func(h http.Handler) http.Handler
-
-func WrapHandler(w ...Wrapper) Option {
-	return func(o *Options) {
-		o.Wrappers = append(o.Wrappers, w...)
-	}
-}
-
-func EnableCORS(b bool) Option {
-	return func(o *Options) {
-		o.EnableCORS = b
-	}
-}
-
-func EnableACME(b bool) Option {
-	return func(o *Options) {
-		o.EnableACME = b
-	}
-}
-
-func ACMEHosts(hosts ...string) Option {
-	return func(o *Options) {
-		o.ACMEHosts = hosts
-	}
-}
-
-func ACMEProvider(p acme.Provider) Option {
-	return func(o *Options) {
-		o.ACMEProvider = p
-	}
-}
-
-func EnableTLS(b bool) Option {
-	return func(o *Options) {
-		o.EnableTLS = b
-	}
-}
-
-func TLSConfig(t *tls.Config) Option {
-	return func(o *Options) {
-		o.TLSConfig = t
-	}
-}
-
-func Resolver(r resolver.Resolver) Option {
-	return func(o *Options) {
-		o.Resolver = r
-	}
-}
-
-func Logger(l logger.Logger) Option {
-	return func(o *Options) {
-		o.Logger = l
-	}
-}

api/server/server.go

@@ -1,15 +0,0 @@
-// Package server provides an API gateway server which handles inbound requests
-package server
-
-import (
-	"net/http"
-)
-
-// Server serves api requests
-type Server interface {
-	Address() string
-	Init(opts ...Option) error
-	Handle(path string, handler http.Handler)
-	Start() error
-	Stop() error
-}

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 uuid
 	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

@@ -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

auth/options.go

@@ -6,13 +6,17 @@ import (
 
 	"github.com/unistack-org/micro/v3/logger"
 	"github.com/unistack-org/micro/v3/metadata"
+	"github.com/unistack-org/micro/v3/meter"
 	"github.com/unistack-org/micro/v3/store"
+	"github.com/unistack-org/micro/v3/tracer"
 )
 
 // NewOptions creates Options struct from slice of options
 func NewOptions(opts ...Option) Options {
 	options := Options{
+		Tracer: tracer.DefaultTracer,
 		Logger: logger.DefaultLogger,
+		Meter:  meter.DefaultMeter,
 	}
 	for _, o := range opts {
 		o(&options)
@@ -20,29 +24,36 @@ func NewOptions(opts ...Option) Options {
 	return options
 }
 
+// Options struct holds auth options
 type Options struct {
-	// 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
-	// Context to store other options
-	Context context.Context
 }
 
 // Option func
@@ -55,6 +66,13 @@ func Addrs(addrs ...string) Option {
 	}
 }
 
+// Name sets the name
+func Name(n string) Option {
+	return func(o *Options) {
+		o.Name = n
+	}
+}
+
 // Issuer of the services account
 func Issuer(i string) Option {
 	return func(o *Options) {
@@ -107,18 +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
@@ -177,16 +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
@@ -288,3 +295,17 @@ func Logger(l logger.Logger) Option {
 		o.Logger = l
 	}
 }
+
+// Meter sets the meter
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
+// Tracer sets the meter
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}

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}

broker/broker.go

@@ -14,6 +14,7 @@ var (
 
 // Broker is an interface used for asynchronous messaging.
 type Broker interface {
+	Name() string
 	Init(...Option) error
 	Options() Options
 	Address() string

broker/memory.go

@@ -0,0 +1,243 @@
+package broker
+
+import (
+	"context"
+	"errors"
+	"sync"
+
+	"github.com/google/uuid"
+	"github.com/unistack-org/micro/v3/logger"
+	maddr "github.com/unistack-org/micro/v3/util/addr"
+	mnet "github.com/unistack-org/micro/v3/util/net"
+	"github.com/unistack-org/micro/v3/util/rand"
+)
+
+type memoryBroker struct {
+	opts        Options
+	Subscribers map[string][]*memorySubscriber
+	addr        string
+	sync.RWMutex
+	connected bool
+}
+
+type memoryEvent struct {
+	opts    Options
+	err     error
+	message interface{}
+	topic   string
+}
+
+type memorySubscriber struct {
+	opts    SubscribeOptions
+	ctx     context.Context
+	exit    chan bool
+	handler Handler
+	id      string
+	topic   string
+}
+
+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 errors.New("not connected")
+	}
+
+	subs, ok := m.Subscribers[topic]
+	m.RUnlock()
+	if !ok {
+		return nil
+	}
+
+	var v interface{}
+	if m.opts.Codec != nil {
+		buf, err := m.opts.Codec.Marshal(msg)
+		if err != nil {
+			return err
+		}
+		v = buf
+	} else {
+		v = msg
+	}
+
+	p := &memoryEvent{
+		topic:   topic,
+		message: v,
+		opts:    m.opts,
+	}
+
+	eh := m.opts.ErrorHandler
+
+	for _, sub := range subs {
+		if err := sub.handler(p); err != nil {
+			p.err = err
+			if sub.opts.ErrorHandler != nil {
+				eh = sub.opts.ErrorHandler
+			}
+			if eh != nil {
+				eh(p)
+			} else if m.opts.Logger.V(logger.ErrorLevel) {
+				m.opts.Logger.Error(m.opts.Context, err.Error())
+			}
+			continue
+		}
+	}
+
+	return 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, errors.New("not connected")
+	}
+	m.RUnlock()
+
+	options := NewSubscribeOptions(opts...)
+
+	id, err := uuid.NewRandom()
+	if err != nil {
+		return nil, err
+	}
+
+	sub := &memorySubscriber{
+		exit:    make(chan bool, 1),
+		id:      id.String(),
+		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()
+		var newSubscribers []*memorySubscriber
+		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 *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 +1,50 @@
+package broker
+
+import (
+	"context"
+	"fmt"
+	"testing"
+)
+
+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)
+	}
+
+	for i := 0; i < count; i++ {
+		message := &Message{
+			Header: map[string]string{
+				"foo": "bar",
+				"id":  fmt.Sprintf("%d", i),
+			},
+			Body: []byte(`hello world`),
+		}
+
+		if err := b.Publish(ctx, topic, message); err != nil {
+			t.Fatalf("Unexpected error publishing %d", i)
+		}
+	}
+
+	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

@@ -1,77 +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...)}
-}
-
-// 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

@@ -6,36 +6,44 @@ import (
 
 	"github.com/unistack-org/micro/v3/codec"
 	"github.com/unistack-org/micro/v3/logger"
-	"github.com/unistack-org/micro/v3/registry"
+	"github.com/unistack-org/micro/v3/meter"
+	"github.com/unistack-org/micro/v3/register"
+	"github.com/unistack-org/micro/v3/tracer"
 )
 
 // Options struct
 type Options struct {
-	Addrs  []string
-	Secure bool
-
-	// Codec
+	// Tracer used for tracing
+	Tracer tracer.Tracer
+	// Register can be used for clustering
+	Register register.Register
+	// Codec holds the codec for marshal/unmarshal
 	Codec codec.Codec
-
-	// Logger the logger
+	// Logger used for logging
 	Logger logger.Logger
-	// Handler executed when errors occur processing messages
-	ErrorHandler Handler
-
-	TLSConfig *tls.Config
-	// Registry used for clustering
-	Registry registry.Registry
-	// Other options for implementations of the interface
-	// can be stored in a context
+	// 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
+	// Name holds the broker name
+	Name string
+	// Addrs holds the broker address
+	Addrs []string
 }
 
 // NewOptions create new Options
 func NewOptions(opts ...Option) Options {
 	options := Options{
-		Registry: registry.DefaultRegistry,
+		Register: register.DefaultRegister,
 		Logger:   logger.DefaultLogger,
 		Context:  context.Background(),
+		Meter:    meter.DefaultMeter,
+		Codec:    codec.DefaultCodec,
+		Tracer:   tracer.DefaultTracer,
 	}
 	for _, o := range opts {
 		o(&options)
@@ -52,11 +60,10 @@ func Context(ctx context.Context) Option {
 
 // PublishOptions struct
 type PublishOptions struct {
-	// BodyOnly says that only body of the message must be published
-	BodyOnly bool
-	// Other options for implementations of the interface
-	// can be stored in a context
+	// Context holds external options
 	Context context.Context
+	// BodyOnly flag says the message contains raw body bytes
+	BodyOnly bool
 }
 
 // NewPublishOptions creates PublishOptions struct
@@ -74,23 +81,16 @@ func NewPublishOptions(opts ...PublishOption) PublishOptions {
 
 // SubscribeOptions struct
 type SubscribeOptions struct {
-	// AutoAck ack messages if handler returns nil err
-	AutoAck bool
-
-	// Handler executed when errors occur processing messages
-	ErrorHandler Handler
-
-	// 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
-
-	// Other options for implementations of the interface
-	// can be stored in a context
+	// Context holds external options
 	Context context.Context
+	// ErrorHandler used when broker can't unmarshal incoming message
+	ErrorHandler Handler
+	// 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
 }
 
 // Option func
@@ -198,17 +198,10 @@ func SubscribeGroup(name string) SubscribeOption {
 	}
 }
 
-// Registry sets registry option
-func Registry(r registry.Registry) Option {
+// Register sets register option
+func Register(r register.Register) Option {
 	return func(o *Options) {
-		o.Registry = r
-	}
-}
-
-// Secure communication with the broker
-func Secure(b bool) Option {
-	return func(o *Options) {
-		o.Secure = b
+		o.Register = r
 	}
 }
 
@@ -226,6 +219,27 @@ func Logger(l logger.Logger) Option {
 	}
 }
 
+// Tracer to be used for tracing
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}
+
+// Meter sets the meter
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
+// Name sets the name
+func Name(n string) Option {
+	return func(o *Options) {
+		o.Name = n
+	}
+}
+
 // SubscribeContext set context
 func SubscribeContext(ctx context.Context) SubscribeOption {
 	return func(o *SubscribeOptions) {

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

@@ -12,16 +12,31 @@ 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.
 // It supports Request/Response via Transport and Publishing via the Broker.
 // It also supports bidirectional streaming of requests.
 type Client interface {
-	Init(...Option) error
+	Name() string
+	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
@@ -72,9 +87,9 @@ 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
@@ -95,18 +110,3 @@ 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/context.go

@@ -32,3 +32,23 @@ func SetPublishOption(k, v interface{}) PublishOption {
 		o.Context = context.WithValue(o.Context, k, v)
 	}
 }
+
+// SetCallOption returns a function to setup a context with given value
+func SetCallOption(k, v interface{}) CallOption {
+	return func(o *CallOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}
+
+// 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)
+	}
+}

client/noop.go

@@ -20,10 +20,6 @@ var (
 	}
 )
 
-const (
-	defaultContentType = "application/json"
-)
-
 type noopClient struct {
 	opts Options
 }
@@ -35,18 +31,31 @@ 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 {
+	return n.opts.Name
 }
 
 func (n *noopRequest) Service() string {
@@ -166,7 +175,7 @@ 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 {
@@ -183,7 +192,7 @@ func (n *noopClient) Publish(ctx context.Context, p Message, opts ...PublishOpti
 
 	options := NewPublishOptions(opts...)
 
-	md, ok := metadata.FromContext(ctx)
+	md, ok := metadata.FromOutgoingContext(ctx)
 	if !ok {
 		md = metadata.New(0)
 	}

client/options.go

@@ -2,48 +2,59 @@ package client
 
 import (
 	"context"
+	"crypto/tls"
 	"time"
 
 	"github.com/unistack-org/micro/v3/broker"
 	"github.com/unistack-org/micro/v3/codec"
 	"github.com/unistack-org/micro/v3/logger"
+	"github.com/unistack-org/micro/v3/meter"
 	"github.com/unistack-org/micro/v3/network/transport"
-	"github.com/unistack-org/micro/v3/registry"
+	"github.com/unistack-org/micro/v3/register"
 	"github.com/unistack-org/micro/v3/router"
 	"github.com/unistack-org/micro/v3/selector"
 	"github.com/unistack-org/micro/v3/selector/random"
+	"github.com/unistack-org/micro/v3/tracer"
 )
 
 // Options holds client options
 type Options struct {
-	// 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
-	Transport transport.Transport
-	Logger    logger.Logger
-	// Lookup used for looking up routes
-	Lookup LookupFunc
-
-	// Connection Pool
-	PoolSize int
-	PoolTTL  time.Duration
-
-	// Middleware for client
-	Wrappers []Wrapper
-
-	// Default Call Options
+	// CallOptions contains default CallOptions
 	CallOptions CallOptions
-
-	// Other options for implementations of the interface
-	// can be stored in a context
+	// 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
+	// Selector used to select needed address
+	Selector selector.Selector
+	// Transport used for transfer messages
+	Transport transport.Transport
+	// Context is used for external options
 	Context context.Context
+	// Codecs map
+	Codecs map[string]codec.Codec
+	// Lookup func used to get destination addr
+	Lookup LookupFunc
+	// 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
+	// PoolSize connection pool size
+	PoolSize int
+	// PoolTTL connection pool ttl
+	PoolTTL time.Duration
+	// TLSConfig specifies tls.Config for secure connection
+	TLSConfig *tls.Config
 }
 
 // NewCallOptions creates new call options struct
@@ -57,37 +68,34 @@ 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
-
-	// Other options for implementations of the interface
-	// can be stored in a context
+	// 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
+	// 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 flag
+	AuthToken bool
 }
 
 // Context pass context to client
@@ -108,11 +116,10 @@ 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
+	// Context used for external options
 	Context context.Context
+	// Exchange topic exchange name
+	Exchange string
 }
 
 // NewMessageOptions creates message options struct
@@ -126,6 +133,7 @@ func NewMessageOptions(opts ...MessageOption) MessageOptions {
 
 // MessageOptions holds client message options
 type MessageOptions struct {
+	// ContentType specify content-type of message
 	ContentType string
 }
 
@@ -140,33 +148,38 @@ 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,
+		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 {
@@ -183,6 +196,13 @@ func Broker(b broker.Broker) Option {
 	}
 }
 
+// Tracer to be used for tracing
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}
+
 // Logger to be used for log mesages
 func Logger(l logger.Logger) Option {
 	return func(o *Options) {
@@ -190,6 +210,13 @@ func Logger(l logger.Logger) Option {
 	}
 }
 
+// Meter to be used for metrics
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
 // Codec to be used to encode/decode requests for a given content type
 func Codec(contentType string, c codec.Codec) Option {
 	return func(o *Options) {
@@ -197,7 +224,7 @@ 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
@@ -232,11 +259,11 @@ func Transport(t transport.Transport) Option {
 	}
 }
 
-// Registry sets the routers registry
-func Registry(r registry.Registry) Option {
+// Register sets the routers register
+func Register(r register.Register) Option {
 	return func(o *Options) {
 		if o.Router != nil {
-			o.Router.Init(router.Registry(r))
+			o.Router.Init(router.Register(r))
 		}
 	}
 }
@@ -255,28 +282,34 @@ 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
 	}
 }
 
+// Name sets the client name
+func Name(n string) Option {
+	return func(o *Options) {
+		o.Name = n
+	}
+}
+
 // Lookup sets the lookup function to use for resolving service names
 func Lookup(l LookupFunc) Option {
 	return func(o *Options) {
@@ -284,8 +317,23 @@ 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
@@ -300,7 +348,6 @@ 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
@@ -314,15 +361,13 @@ 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
 func WithExchange(e string) PublishOption {
 	return func(o *PublishOptions) {
@@ -441,8 +486,6 @@ func WithMessageContentType(ct string) MessageOption {
 	}
 }
 
-// Request Options
-
 // WithContentType specifies request content type
 func WithContentType(ct string) RequestOption {
 	return func(o *RequestOptions) {

client/test_request.go

@@ -5,13 +5,13 @@ import (
 )
 
 type testRequest struct {
-	service     string
+	opts        RequestOptions
+	codec       codec.Codec
+	body        interface{}
 	method      string
 	endpoint    string
 	contentType string
-	codec       codec.Codec
-	body        interface{}
-	opts        RequestOptions
+	service     string
 }
 
 func (r *testRequest) ContentType() string {

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 +25,12 @@ var (
 
 var (
 	// DefaultMaxMsgSize specifies how much data codec can handle
-	DefaultMaxMsgSize       = 1024 * 1024 * 4 // 4Mb
-	DefaultCodec      Codec = NewCodec()
+	DefaultMaxMsgSize int = 1024 * 1024 * 4 // 4Mb
+	// DefaultCodec is the global default codec
+	DefaultCodec Codec = NewCodec()
 )
 
-// MessageType
+// MessageType specifies message type for codec
 type MessageType int
 
 // Codec encodes/decodes various types of messages used within micro.
@@ -50,31 +51,14 @@ 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
-}
-
-// Option func
-type Option func(*Options)
-
-// Options contains codec options
-type Options struct {
-	MaxMsgSize int64
-}
-
-// MaxMsgSize sets the max message size
-func MaxMsgSize(n int64) Option {
-	return func(o *Options) {
-		o.MaxMsgSize = n
-	}
+	Id       string
+	Body     []byte
+	Type     MessageType
 }
 
 // NewMessage creates new codec message

codec/frame.go

@@ -0,0 +1,6 @@
+package codec
+
+// Frame gives us the ability to define raw data to send over the pipes
+type Frame struct {
+	Data []byte
+}

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

@@ -1,25 +1,20 @@
 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
-}
-
 func (c *noopCodec) ReadHeader(conn io.Reader, m *Message, t MessageType) error {
 	return nil
 }
 
 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
 	}
@@ -29,18 +24,14 @@ 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:
 		v.Data = buf
 	default:
-		return ErrInvalidMessage
+		return json.Unmarshal(buf, v)
 	}
 
 	return nil
@@ -64,7 +55,11 @@ func (c *noopCodec) Write(conn io.Writer, m *Message, b interface{}) error {
 	case []byte:
 		v = vb
 	default:
-		return ErrInvalidMessage
+		var err error
+		v, err = json.Marshal(vb)
+		if err != nil {
+			return err
+		}
 	}
 	_, err := conn.Write(v)
 	return err
@@ -98,30 +93,28 @@ func (c *noopCodec) Marshal(v interface{}) ([]byte, error) {
 	case *Message:
 		return ve.Body, nil
 	}
-	return nil, ErrInvalidMessage
+
+	return json.Marshal(v)
 }
 
 func (c *noopCodec) Unmarshal(d []byte, v interface{}) error {
-	var err 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
-	default:
-		err = ErrInvalidMessage
+		return nil
 	}
 
-	return err
+	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

@@ -0,0 +1,66 @@
+package codec
+
+import (
+	"github.com/unistack-org/micro/v3/logger"
+	"github.com/unistack-org/micro/v3/meter"
+	"github.com/unistack-org/micro/v3/tracer"
+)
+
+// Option func
+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
+	// MaxMsgSize specifies max messages size that reads by codec
+	MaxMsgSize int
+}
+
+// MaxMsgSize sets the max message size
+func MaxMsgSize(n int) Option {
+	return func(o *Options) {
+		o.MaxMsgSize = n
+	}
+}
+
+// Logger sets the logger
+func Logger(l logger.Logger) Option {
+	return func(o *Options) {
+		o.Logger = l
+	}
+}
+
+// Tracer to be used for tracing
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}
+
+// Meter sets the meter
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
+// NewOptions returns new options
+func NewOptions(opts ...Option) Options {
+	options := Options{
+		Logger:     logger.DefaultLogger,
+		Meter:      meter.DefaultMeter,
+		Tracer:     tracer.DefaultTracer,
+		MaxMsgSize: DefaultMaxMsgSize,
+	}
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	return options
+}

config/config.go

@@ -22,6 +22,7 @@ var (
 
 // Config is an interface abstraction for dynamic configuration
 type Config interface {
+	Name() string
 	// Init the config
 	Init(opts ...Option) error
 	// Options in the config

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

@@ -5,6 +5,9 @@ import (
 	"reflect"
 	"strconv"
 	"strings"
+
+	"github.com/imdario/mergo"
+	rutil "github.com/unistack-org/micro/v3/util/reflect"
 )
 
 type defaultConfig struct {
@@ -29,9 +32,15 @@ func (c *defaultConfig) Load(ctx context.Context) error {
 		}
 	}
 
-	valueOf := reflect.ValueOf(c.opts.Struct)
+	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 := c.fillValues(ctx, valueOf); err != nil && !c.opts.AllowFail {
+	if err != nil && !c.opts.AllowFail {
 		return err
 	}
 
@@ -44,8 +53,9 @@ func (c *defaultConfig) Load(ctx context.Context) error {
 	return nil
 }
 
+//nolint:gocyclo
 func (c *defaultConfig) fillValue(ctx context.Context, value reflect.Value, val string) error {
-	if !IsEmpty(value) {
+	if !rutil.IsEmpty(value) {
 		return nil
 	}
 	switch value.Kind() {
@@ -98,7 +108,7 @@ 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 {
@@ -128,7 +138,7 @@ 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 {
@@ -158,7 +168,7 @@ 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
 }
@@ -242,6 +252,11 @@ func (c *defaultConfig) String() string {
 	return "default"
 }
 
+func (c *defaultConfig) Name() string {
+	return c.opts.Name
+}
+
+// NewConfig returns new default config source
 func NewConfig(opts ...Option) Config {
 	options := NewOptions(opts...)
 	if len(options.StructTag) == 0 {

config/options.go

@@ -5,31 +5,49 @@ import (
 
 	"github.com/unistack-org/micro/v3/codec"
 	"github.com/unistack-org/micro/v3/logger"
+	"github.com/unistack-org/micro/v3/meter"
+	"github.com/unistack-org/micro/v3/tracer"
 )
 
+// Options hold the config options
 type Options struct {
-	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{}
-	// struct tag name
-	StructTag string
-	// logger that will be used
-	Logger logger.Logger
-	// codec that used for load/save
+	// Codec that used for load/save
 	Codec codec.Codec
-	// 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,
+		Meter:   meter.DefaultMeter,
+		Tracer:  tracer.DefaultTracer,
 		Context: context.Background(),
 	}
 	for _, o := range opts {
@@ -39,36 +57,42 @@ func NewOptions(opts ...Option) 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
@@ -82,12 +106,20 @@ func Codec(c codec.Codec) Option {
 	}
 }
 
+// Logger sets the logger
 func Logger(l logger.Logger) Option {
 	return func(o *Options) {
 		o.Logger = l
 	}
 }
 
+// Tracer to be used for tracing
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}
+
 // Struct used as config
 func Struct(v interface{}) Option {
 	return func(o *Options) {
@@ -95,9 +127,16 @@ 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
 	}
 }
+
+// Name sets the name
+func Name(n string) Option {
+	return func(o *Options) {
+		o.Name = n
+	}
+}

config/reflect.go

@@ -1,46 +0,0 @@
-package config
-
-import (
-	"reflect"
-)
-
-func IsEmpty(v reflect.Value) bool {
-	switch v.Kind() {
-	case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
-		return v.Len() == 0
-	case reflect.Bool:
-		return !v.Bool()
-	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-		return v.Int() == 0
-	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
-		return v.Uint() == 0
-	case reflect.Float32, reflect.Float64:
-		return v.Float() == 0
-	case reflect.Interface, reflect.Ptr:
-		if v.IsNil() {
-			return true
-		}
-		return IsEmpty(v.Elem())
-	case reflect.Func:
-		return v.IsNil()
-	case reflect.Invalid:
-		return true
-	}
-	return false
-}
-
-func Zero(src interface{}) (interface{}, error) {
-	sv := reflect.ValueOf(src)
-
-	if sv.Kind() == reflect.Ptr {
-		sv = sv.Elem()
-	}
-
-	if sv.Kind() == reflect.Invalid {
-		return nil, ErrInvalidStruct
-	}
-
-	dst := reflect.New(sv.Type())
-
-	return dst.Interface(), nil
-}

config/reflect_test.go

@@ -3,7 +3,7 @@ package config_test
 import (
 	"testing"
 
-	"github.com/unistack-org/micro/v3/config"
+	rutil "github.com/unistack-org/micro/v3/util/reflect"
 )
 
 type Config struct {
@@ -18,7 +18,7 @@ type SubConfig struct {
 
 func TestReflect(t *testing.T) {
 	cfg1 := &Config{Value: "cfg1", Config: &Config{Value: "cfg1_1"}, SubConfig: &SubConfig{Value: "cfg1"}}
-	cfg2, err := config.Zero(cfg1)
+	cfg2, err := rutil.Zero(cfg1)
 	if err != nil {
 		t.Fatal(err)
 	}

context.go

@@ -0,0 +1,22 @@
+package micro
+
+import "context"
+
+type serviceKey struct{}
+
+// FromContext retrieves a Service from the Context.
+func FromContext(ctx context.Context) (Service, bool) {
+	if ctx == nil {
+		return nil, false
+	}
+	s, ok := ctx.Value(serviceKey{}).(Service)
+	return s, ok
+}
+
+// NewContext returns a new Context with the Service embedded within it.
+func NewContext(ctx context.Context, s Service) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	return context.WithValue(ctx, serviceKey{}, s)
+}

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 uuid
+	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,

event.go

@@ -6,11 +6,22 @@ import (
 	"github.com/unistack-org/micro/v3/client"
 )
 
+// Event is used to publish messages to a topic
+type Event interface {
+	// Publish publishes a message to the event topic
+	Publish(ctx context.Context, msg interface{}, opts ...client.PublishOption) error
+}
+
 type event struct {
 	c     client.Client
 	topic string
 }
 
+// NewEvent creates a new event publisher
+func NewEvent(topic string, c client.Client) Event {
+	return &event{c, topic}
+}
+
 func (e *event) Publish(ctx context.Context, msg interface{}, opts ...client.PublishOption) error {
 	return e.c.Publish(ctx, e.c.NewMessage(e.topic, msg), opts...)
 }

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. "registry.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/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, 1)
+			steps[0] = make([]string, 0, 1)
+		} else if idx >= len(steps) {
+			tsteps := make([][]string, idx+1, 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/flow.go

@@ -0,0 +1,7 @@
+// Package flow is an interface used for saga pattern messaging
+package flow
+
+type Step interface {
+	// Endpoint returns service_name.service_method
+	Endpoint() string
+}

function.go

@@ -1,3 +1,5 @@
+// +build ignore
+
 package micro
 
 import (
@@ -7,11 +9,28 @@ import (
 	"github.com/unistack-org/micro/v3/server"
 )
 
+// Function is a one time executing Service
+type Function interface {
+	// Inherits Service interface
+	Service
+	// Done signals to complete execution
+	Done() error
+	// Handle registers an RPC handler
+	Handle(v interface{}) error
+	// Subscribe registers a subscriber
+	Subscribe(topic string, v interface{}) error
+}
+
 type function struct {
 	cancel context.CancelFunc
 	Service
 }
 
+// NewFunction returns a new Function for a one time executing Service
+func NewFunction(opts ...Option) Function {
+	return newFunction(opts...)
+}
+
 func fnHandlerWrapper(f Function) server.HandlerWrapper {
 	return func(h server.HandlerFunc) server.HandlerFunc {
 		return func(ctx context.Context, req server.Request, rsp interface{}) error {
@@ -45,7 +64,7 @@ func newFunction(opts ...Option) Function {
 	// make context the last thing
 	fopts = append(fopts, Context(ctx))
 
-	service := newService(fopts...)
+	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-registry-memory"
+	"github.com/unistack-org/micro/v3/register"
 )
 
 func TestFunction(t *testing.T) {
 	var wg sync.WaitGroup
 	wg.Add(1)
 
-	r := rmemory.NewRegistry()
-
+	r := register.NewRegister()
+	ctx := context.TODO()
 	// create service
 	fn := NewFunction(
-		Registry(r),
+		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)
 	}
 }
+
+*/

go.mod

@@ -1,24 +1,13 @@
 module github.com/unistack-org/micro/v3
 
-go 1.14
+go 1.16
 
 require (
-	github.com/caddyserver/certmagic v0.10.6
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
-	github.com/ef-ds/deque v1.0.4-0.20190904040645-54cb57c252a1
-	github.com/go-acme/lego/v3 v3.4.0
-	github.com/golang/protobuf v1.4.3
-	github.com/google/uuid v1.1.2
-	github.com/kr/text v0.2.0 // indirect
-	github.com/miekg/dns v1.1.31
-	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
-	github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c
-	github.com/stretchr/testify v1.5.1
-	golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a
-	golang.org/x/net v0.0.0-20200904194848-62affa334b73
-	golang.org/x/sys v0.0.0-20200615200032-f1bc736245b1 // indirect
-	google.golang.org/protobuf v1.25.0
-	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
-	gopkg.in/square/go-jose.v2 v2.4.1 // indirect
-	gopkg.in/yaml.v2 v2.3.0 // indirect
+	github.com/ef-ds/deque v1.0.4
+	github.com/google/uuid v1.2.0
+	github.com/imdario/mergo v0.3.12
+	github.com/patrickmn/go-cache v2.1.0+incompatible
+	github.com/silas/dag v0.0.0-20210121180416-41cf55125c34
+	golang.org/x/net v0.0.0-20210326220855-61e056675ecf
 )

go.sum

@@ -1,431 +1,22 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
-cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
-cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
-cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
-cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
-cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
-cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
-cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
-cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
-cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
-contrib.go.opencensus.io/exporter/ocagent v0.4.12/go.mod h1:450APlNTSR6FrvC3CTRqYosuDstRB9un7SOx2k/9ckA=
-dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
-github.com/Azure/azure-sdk-for-go v32.4.0+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc=
-github.com/Azure/go-autorest/autorest v0.1.0/go.mod h1:AKyIcETwSUFxIcs/Wnq/C+kwCtlEYGUVd7FPNb2slmg=
-github.com/Azure/go-autorest/autorest v0.5.0/go.mod h1:9HLKlQjVBH6U3oDfsXOeVc56THsLPw1L03yban4xThw=
-github.com/Azure/go-autorest/autorest/adal v0.1.0/go.mod h1:MeS4XhScH55IST095THyTxElntu7WqB7pNbZo8Q5G3E=
-github.com/Azure/go-autorest/autorest/adal v0.2.0/go.mod h1:MeS4XhScH55IST095THyTxElntu7WqB7pNbZo8Q5G3E=
-github.com/Azure/go-autorest/autorest/azure/auth v0.1.0/go.mod h1:Gf7/i2FUpyb/sGBLIFxTBzrNzBo7aPXXE3ZVeDRwdpM=
-github.com/Azure/go-autorest/autorest/azure/cli v0.1.0/go.mod h1:Dk8CUAt/b/PzkfeRsWzVG9Yj3ps8mS8ECztu43rdU8U=
-github.com/Azure/go-autorest/autorest/date v0.1.0/go.mod h1:plvfp3oPSKwf2DNjlBjWF/7vwR+cUD/ELuzDCXwHUVA=
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-google.golang.org/appengine v1.6.1/go.mod h1:i06prIuMbXzDqacNJfV5OdTW448YApPu5ww/cMBSeb0=
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-google.golang.org/genproto v0.0.0-20190502173448-54afdca5d873/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
-google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
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-google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
-google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
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-google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
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 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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-gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
-gopkg.in/h2non/gock.v1 v1.0.15/go.mod h1:sX4zAkdYX1TRGJ2JY156cFspQn4yRWn6p9EMdODlynE=
-gopkg.in/ini.v1 v1.42.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
-gopkg.in/ini.v1 v1.44.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
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-gopkg.in/resty.v1 v1.9.1/go.mod h1:vo52Hzryw9PnPHcJfPsBiFW62XhNx5OczbV9y+IMpgc=
-gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
-gopkg.in/square/go-jose.v2 v2.3.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
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-gopkg.in/square/go-jose.v2 v2.4.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
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 gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
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-rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=

logger/logger.go

@@ -6,7 +6,7 @@ import "context"
 var (
 	// DefaultLogger variable
 	DefaultLogger Logger = NewLogger()
-	// DefaultLogger level
+	// DefaultLevel used by logger
 	DefaultLevel Level = InfoLevel
 )
 

logger/micro.go

@@ -21,9 +21,9 @@ func init() {
 }
 
 type defaultLogger struct {
-	sync.RWMutex
 	opts Options
 	enc  *json.Encoder
+	sync.RWMutex
 }
 
 // Init(opts...) should only overwrite provided options
@@ -49,10 +49,18 @@ func (l *defaultLogger) V(level Level) bool {
 }
 
 func (l *defaultLogger) Fields(fields map[string]interface{}) Logger {
-	l.Lock()
-	l.opts.Fields = copyFields(fields)
-	l.Unlock()
-	return l
+	nl := &defaultLogger{opts: l.opts, enc: l.enc}
+	nl.opts.Fields = make(map[string]interface{}, len(l.opts.Fields)+len(fields))
+	l.RLock()
+	for k, v := range l.opts.Fields {
+		nl.opts.Fields[k] = v
+	}
+	l.RUnlock()
+
+	for k, v := range fields {
+		nl.opts.Fields[k] = v
+	}
+	return nl
 }
 
 func copyFields(src map[string]interface{}) map[string]interface{} {
@@ -153,7 +161,9 @@ func (l *defaultLogger) Log(ctx context.Context, level Level, args ...interface{
 	}
 
 	fields["timestamp"] = time.Now().Format("2006-01-02 15:04:05")
-	fields["msg"] = fmt.Sprint(args...)
+	if len(args) > 0 {
+		fields["msg"] = fmt.Sprint(args...)
+	}
 
 	l.RLock()
 	_ = l.enc.Encode(fields)
@@ -178,7 +188,7 @@ func (l *defaultLogger) Logf(ctx context.Context, level Level, msg string, args
 	fields["timestamp"] = time.Now().Format("2006-01-02 15:04:05")
 	if len(args) > 0 {
 		fields["msg"] = fmt.Sprintf(msg, args...)
-	} else {
+	} else if msg != "" {
 		fields["msg"] = msg
 	}
 	l.RLock()

logger/options.go

@@ -11,16 +11,18 @@ type Option func(*Options)
 
 // Options holds logger options
 type Options struct {
-	// 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 map[string]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
 }
 
 // NewOptions creates new options struct
@@ -72,3 +74,10 @@ func WithContext(ctx context.Context) Option {
 		o.Context = ctx
 	}
 }
+
+// WithName sets the name
+func withName(n string) Option {
+	return func(o *Options) {
+		o.Name = n
+	}
+}

logger/wrapper/wrapper.go

@@ -0,0 +1,408 @@
+// 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
+type ClientStreamObserver func(context.Context, client.Request, []client.CallOption, client.Stream, error) []string
+type ClientPublishObserver func(context.Context, client.Message, []client.PublishOption, error) []string
+type ClientCallFuncObserver func(context.Context, string, client.Request, interface{}, client.CallOptions, error) []string
+type ServerHandlerObserver func(context.Context, server.Request, interface{}, error) []string
+type ServerSubscriberObserver func(context.Context, server.Message, error) []string
+
+// Options struct for wrapper
+type Options struct {
+	// Logger that used for log
+	Logger logger.Logger
+	// Level for logger
+	Level logger.Level
+	// Enabled flag
+	Enabled bool
+	// ClientCallObservers funcs
+	ClientCallObservers []ClientCallObserver
+	// ClientStreamObservers funcs
+	ClientStreamObservers []ClientStreamObserver
+	// ClientPublishObservers funcs
+	ClientPublishObservers []ClientPublishObserver
+	// ClientCallFuncObservers funcs
+	ClientCallFuncObservers []ClientCallFuncObserver
+	// ServerHandlerObservers funcs
+	ServerHandlerObservers []ServerHandlerObserver
+	// ServerSubscriberObservers funcs
+	ServerSubscriberObservers []ServerSubscriberObserver
+	// SkipEndpoints
+	SkipEndpoints []string
+}
+
+// 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{}, int(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{}, int(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{}, int(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{}, int(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{}, int(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{}, int(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

@@ -0,0 +1,144 @@
+// Package metadata is a way of defining message headers
+package metadata
+
+import (
+	"context"
+)
+
+type mdIncomingKey struct{}
+type mdOutgoingKey struct{}
+type 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(mdKey{}).(*rawMetadata)
+	if !ok || md.md == nil {
+		return nil, false
+	}
+	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()
+	}
+	ctx = context.WithValue(ctx, mdKey{}, &rawMetadata{md})
+	ctx = context.WithValue(ctx, mdIncomingKey{}, &rawMetadata{})
+	ctx = context.WithValue(ctx, mdOutgoingKey{}, &rawMetadata{})
+	return ctx
+}
+
+// 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()
+	}
+	ctx = context.WithValue(ctx, mdIncomingKey{}, &rawMetadata{md})
+	if v, ok := ctx.Value(mdOutgoingKey{}).(*rawMetadata); !ok || v == nil {
+		ctx = context.WithValue(ctx, mdOutgoingKey{}, &rawMetadata{})
+	}
+	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

@@ -2,22 +2,60 @@
 package metadata
 
 import (
-	"context"
 	"net/textproto"
+	"sort"
 )
 
-type metadataKey struct{}
+var (
+	// HeaderPrefix for all headers passed
+	HeaderPrefix = "Micro-"
+)
 
 // 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
 
+type rawMetadata struct {
+	md Metadata
+}
+
 var (
-	// DefaultMetadataSize used when need to init new Metadata
-	DefaultMetadataSize = 6
+	// defaultMetadataSize used when need to init new Metadata
+	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
+	}
+
+	*k = iter.keys[iter.cur]
+	*v = iter.md[*k]
+	iter.cur++
+	return true
+}
+
+// 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)
+	for k := range md {
+		iter.keys = append(iter.keys, k)
+	}
+	sort.Strings(iter.keys)
+	return iter
+}
+
 // Get returns value from metadata by key
 func (md Metadata) Get(key string) (string, bool) {
 	// fast path
@@ -37,12 +75,9 @@ 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
@@ -54,75 +89,18 @@ 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)
-}
-
-// FromContext returns metadata from the given context
-func FromContext(ctx context.Context) (Metadata, bool) {
-	if ctx == nil {
-		return nil, false
-	}
-	md, ok := ctx.Value(metadataKey{}).(Metadata)
-	if !ok {
-		return nil, ok
-	}
-	nmd := Copy(md)
-	return nmd, ok
-}
-
 // New return new sized metadata
 func New(size int) Metadata {
 	if size == 0 {
-		size = DefaultMetadataSize
+		size = defaultMetadataSize
 	}
 	return make(Metadata, size)
 }
 
-// NewContext creates a new context with the given metadata
-func NewContext(ctx context.Context, md Metadata) context.Context {
-	if ctx == nil {
-		ctx = context.Background()
-	}
-	return context.WithValue(ctx, metadataKey{}, Copy(md))
-}
-
-// MergeContext merges metadata to existing metadata, overwriting if specified
-func MergeContext(ctx context.Context, pmd Metadata, overwrite bool) context.Context {
-	if ctx == nil {
-		ctx = context.Background()
-	}
-	md, ok := FromContext(ctx)
-	if !ok {
-		return context.WithValue(ctx, metadataKey{}, Copy(pmd))
-	}
-	nmd := Copy(md)
-	for key, val := range pmd {
+// Merge merges metadata to existing metadata, overwriting if specified
+func Merge(omd Metadata, mmd Metadata, overwrite bool) Metadata {
+	nmd := Copy(omd)
+	for key, val := range mmd {
 		if _, ok := nmd[key]; ok && !overwrite {
 			// skip
 		} else if val != "" {
@@ -131,5 +109,22 @@ func MergeContext(ctx context.Context, pmd Metadata, overwrite bool) context.Con
 			nmd.Del(key)
 		}
 	}
-	return context.WithValue(ctx, metadataKey{}, nmd)
+	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

@@ -2,26 +2,101 @@ package metadata
 
 import (
 	"context"
-	"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",
+	}
+	mmd := Metadata{
+		"key2": "val2",
+	}
+
+	nmd := Merge(omd, mmd, true)
+	if len(nmd) != 2 {
+		t.Fatalf("merge failed: %v", nmd)
+	}
+}
+
+func TestIterator(t *testing.T) {
+	md := Metadata{
+		"1Last":   "last",
+		"2First":  "first",
+		"3Second": "second",
+	}
+
+	iter := md.Iterator()
+	var k, v string
+
+	for iter.Next(&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" {
@@ -31,9 +106,11 @@ func TestMedataCanonicalKey(t *testing.T) {
 }
 
 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")
 	}
@@ -48,15 +125,8 @@ 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")
 	}
@@ -107,42 +177,3 @@ 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/context.go

@@ -0,0 +1,34 @@
+package meter
+
+import (
+	"context"
+)
+
+type meterKey struct{}
+
+// FromContext get meter from context
+func FromContext(ctx context.Context) (Meter, bool) {
+	if ctx == nil {
+		return nil, false
+	}
+	c, ok := ctx.Value(meterKey{}).(Meter)
+	return c, ok
+}
+
+// NewContext put meter in context
+func NewContext(ctx context.Context, c Meter) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	return context.WithValue(ctx, meterKey{}, 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)
+	}
+}

meter/generate.go

@@ -0,0 +1,3 @@
+package meter
+
+//go:generate protoc -I./handler -I../ -I/home/vtolstov/.cache/go-path/pkg/mod/github.com/unistack-org/micro-proto@v0.0.1 --micro_out=components=micro|http|server,standalone=false,debug=true,paths=source_relative:./handler handler/handler.proto

meter/handler/handler.go

@@ -0,0 +1,69 @@
+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"
+)
+
+var (
+	// guard to fail early
+	_ MeterServer = &handler{}
+)
+
+type handler struct {
+	opts Options
+}
+
+type Option func(*Options)
+
+type Options struct {
+	Meter        meter.Meter
+	MeterOptions []meter.Option
+	Name         string
+}
+
+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: {
+          key: "default";
+          value: {
+            description: "Error response";
+            schema: {
+              json_schema: {
+                ref: "micro.codec.Frame";
+              }
+            }
+          }
+        }
+    };
+		option (micro.api.http) = { get: "/metrics"; };
+  };
+};