meter: complete interface

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

api/router/options.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/unistack-org/micro/v3/api/resolver"
 	"github.com/unistack-org/micro/v3/api/resolver/vpath"
+	"github.com/unistack-org/micro/v3/logger"
 	"github.com/unistack-org/micro/v3/registry"
 )
 
@@ -12,6 +13,7 @@ type Options struct {
 	Handler  string
 	Registry registry.Registry
 	Resolver resolver.Resolver
+	Logger   logger.Logger
 	Context  context.Context
 }
 

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/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)
@@ -41,6 +45,10 @@ type Options struct {
 	Addrs []string
 	// Logger sets the logger
 	Logger logger.Logger
+	// Meter sets tht meter
+	Meter meter.Meter
+	// Tracer
+	Tracer tracer.Tracer
 	// Context to store other options
 	Context context.Context
 }
@@ -288,3 +296,17 @@ 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
+	}
+}

broker/options.go

@@ -6,27 +6,30 @@ 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/registry"
+	"github.com/unistack-org/micro/v3/tracer"
 )
 
 // Options struct
 type Options struct {
-	Addrs  []string
-	Secure bool
-
-	// Codec
-	Codec codec.Codec
-
-	// Logger the logger
-	Logger logger.Logger
-	// Handler executed when errors occur processing messages
+	// Addrs useed by broker
+	Addrs []string
+	// ErrorHandler executed when errors occur processing messages
 	ErrorHandler Handler
-
+	// Codec used to marshal/unmarshal messages
+	Codec codec.Codec
+	// Logger the used logger
+	Logger logger.Logger
+	// Meter the used for metrics
+	Meter meter.Meter
+	// Tracer used for trace
+	Tracer tracer.Tracer
+	// TLSConfig for secure communication
 	TLSConfig *tls.Config
 	// Registry used for clustering
 	Registry registry.Registry
-	// Other options for implementations of the interface
-	// can be stored in a context
+	// Context is used for non default options
 	Context context.Context
 }
 
@@ -36,6 +39,9 @@ func NewOptions(opts ...Option) Options {
 		Registry: registry.DefaultRegistry,
 		Logger:   logger.DefaultLogger,
 		Context:  context.Background(),
+		Meter:    meter.DefaultMeter,
+		Codec:    codec.DefaultCodec,
+		Tracer:   tracer.DefaultTracer,
 	}
 	for _, o := range opts {
 		o(&options)
@@ -54,8 +60,7 @@ func Context(ctx context.Context) Option {
 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 for non default options
 	Context context.Context
 }
 
@@ -77,10 +82,10 @@ type SubscribeOptions struct {
 	// AutoAck ack messages if handler returns nil err
 	AutoAck bool
 
-	// Handler executed when errors occur processing messages
+	// ErrorHandler executed when errors occur processing messages
 	ErrorHandler Handler
 
-	// Subscribers with the same group name
+	// Group for subscriber, Subscribers with the same group name
 	// will create a shared subscription where each
 	// receives a subset of messages.
 	Group string
@@ -88,8 +93,7 @@ type SubscribeOptions struct {
 	// 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 is used for non default options
 	Context context.Context
 }
 
@@ -205,13 +209,6 @@ func Registry(r registry.Registry) Option {
 	}
 }
 
-// Secure communication with the broker
-func Secure(b bool) Option {
-	return func(o *Options) {
-		o.Secure = b
-	}
-}
-
 // TLSConfig sets the TLS Config
 func TLSConfig(t *tls.Config) Option {
 	return func(o *Options) {
@@ -226,6 +223,20 @@ 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
+	}
+}
+
 // SubscribeContext set context
 func SubscribeContext(ctx context.Context) SubscribeOption {
 	return func(o *SubscribeOptions) {

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/options.go

@@ -7,11 +7,13 @@ import (
 	"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/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
@@ -28,21 +30,21 @@ type Options struct {
 	Selector  selector.Selector
 	Transport transport.Transport
 	Logger    logger.Logger
+	Meter     meter.Meter
 	// Lookup used for looking up routes
 	Lookup LookupFunc
 
 	// Connection Pool
 	PoolSize int
 	PoolTTL  time.Duration
-
-	// Middleware for client
+	Tracer   tracer.Tracer
+	// Wrapper that used client
 	Wrappers []Wrapper
 
-	// Default Call Options
+	// CallOptions that used by default
 	CallOptions CallOptions
 
-	// Other options for implementations of the interface
-	// can be stored in a context
+	// Context is used for non default options
 	Context context.Context
 }
 
@@ -81,12 +83,9 @@ type CallOptions struct {
 	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 is uded for non default options
 	Context context.Context
 }
 
@@ -142,7 +141,6 @@ func NewRequestOptions(opts ...RequestOption) RequestOptions {
 type RequestOptions struct {
 	ContentType string
 	Stream      bool
-
 	// Other options for implementations of the interface
 	// can be stored in a context
 	Context context.Context
@@ -167,6 +165,8 @@ func NewOptions(opts ...Option) Options {
 		Selector: random.NewSelector(),
 		Logger:   logger.DefaultLogger,
 		Broker:   broker.DefaultBroker,
+		Meter:    meter.DefaultMeter,
+		Tracer:   tracer.DefaultTracer,
 	}
 
 	for _, o := range opts {
@@ -183,6 +183,13 @@ 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 +197,13 @@ 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) {

codec/codec.go

@@ -25,7 +25,7 @@ var (
 
 var (
 	// DefaultMaxMsgSize specifies how much data codec can handle
-	DefaultMaxMsgSize       = 1024 * 1024 * 4 // 4Mb
+	DefaultMaxMsgSize int   = 1024 * 1024 * 4 // 4Mb
 	DefaultCodec      Codec = NewCodec()
 )
 
@@ -62,21 +62,6 @@ type Message struct {
 	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
-	}
-}
-
 // NewMessage creates new codec message
 func NewMessage(t MessageType) *Message {
 	return &Message{Type: t, Header: metadata.New(0)}

codec/options.go

@@ -0,0 +1,61 @@
+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 {
+	MaxMsgSize int
+	Meter      meter.Meter
+	Logger     logger.Logger
+	Tracer     tracer.Tracer
+}
+
+// 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
+	}
+}
+
+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/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
 	}
 
@@ -45,7 +54,7 @@ func (c *defaultConfig) Load(ctx context.Context) error {
 }
 
 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() {

config/options.go

@@ -5,6 +5,8 @@ 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"
 )
 
 type Options struct {
@@ -15,13 +17,17 @@ type Options struct {
 	AfterSave  []func(context.Context, Config) error
 	// Struct that holds config data
 	Struct interface{}
-	// struct tag name
+	// StructTag name
 	StructTag string
-	// logger that will be used
+	// Logger that will be used
 	Logger logger.Logger
-	// codec that used for load/save
+	// Meter that will be used
+	Meter meter.Meter
+	// Tracer used for trace
+	Tracer tracer.Tracer
+	// Codec that used for load/save
 	Codec codec.Codec
-	// for alternative data
+	// Context for alternative data
 	Context context.Context
 }
 
@@ -30,6 +36,8 @@ type Option func(o *Options)
 func NewOptions(opts ...Option) Options {
 	options := Options{
 		Logger:  logger.DefaultLogger,
+		Meter:   meter.DefaultMeter,
+		Tracer:  tracer.DefaultTracer,
 		Context: context.Background(),
 	}
 	for _, o := range opts {
@@ -88,6 +96,13 @@ 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
+	}
+}
+
 // Struct used as config
 func Struct(v interface{}) Option {
 	return func(o *Options) {

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)
 	}

go.mod

@@ -3,22 +3,20 @@ module github.com/unistack-org/micro/v3
 go 1.14
 
 require (
-	github.com/caddyserver/certmagic v0.10.6
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
-	github.com/ef-ds/deque v1.0.4-0.20190904040645-54cb57c252a1
-	github.com/go-acme/lego/v3 v3.4.0
+	github.com/ef-ds/deque v1.0.4
 	github.com/golang/protobuf v1.4.3
-	github.com/google/uuid v1.1.2
+	github.com/google/uuid v1.1.5
+	github.com/imdario/mergo v0.3.11
 	github.com/kr/text v0.2.0 // indirect
-	github.com/miekg/dns v1.1.31
+	github.com/miekg/dns v1.1.35
 	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
 	github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c
-	github.com/stretchr/testify v1.5.1
-	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
+	github.com/stretchr/testify v1.7.0
+	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad // indirect
+	golang.org/x/net v0.0.0-20201224014010-6772e930b67b
+	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e // indirect
 	google.golang.org/protobuf v1.25.0
 	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
-	gopkg.in/square/go-jose.v2 v2.4.1 // indirect
-	gopkg.in/yaml.v2 v2.3.0 // indirect
 )

go.sum

@@ -1,98 +1,21 @@
 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=
-github.com/Azure/go-autorest/autorest/mocks v0.1.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0=
-github.com/Azure/go-autorest/autorest/to v0.2.0/go.mod h1:GunWKJp1AEqgMaGLV+iocmRAJWqST1wQYhyyjXJ3SJc=
-github.com/Azure/go-autorest/autorest/validation v0.1.0/go.mod h1:Ha3z/SqBeaalWQvokg3NZAlQTalVMtOIAs1aGK7G6u8=
-github.com/Azure/go-autorest/logger v0.1.0/go.mod h1:oExouG+K6PryycPJfVSxi/koC6LSNgds39diKLz7Vrc=
-github.com/Azure/go-autorest/tracing v0.1.0/go.mod h1:ROEEAFwXycQw7Sn3DXNtEedEvdeRAgDr0izn4z5Ij88=
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
-github.com/OpenDNS/vegadns2client v0.0.0-20180418235048-a3fa4a771d87/go.mod h1:iGLljf5n9GjT6kc0HBvyI1nOKnGQbNB66VzSNbK5iks=
-github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
-github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
-github.com/akamai/AkamaiOPEN-edgegrid-golang v0.9.0/go.mod h1:zpDJeKyp9ScW4NNrbdr+Eyxvry3ilGPewKoXw3XGN1k=
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-google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
-google.golang.org/grpc v1.19.1/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
-google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
-google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
 google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
@@ -400,32 +115,12 @@ google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2
 google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4c=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
-gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f h1:BLraFXnmrev5lT+xlilqcH8XK9/i0At2xKjWk4p6zsU=
 gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-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=
-gopkg.in/ns1/ns1-go.v2 v2.0.0-20190730140822-b51389932cbc/go.mod h1:VV+3haRsgDiVLxyifmMBrBIuCWFBPYKbRssXB9z67Hw=
-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=
-gopkg.in/square/go-jose.v2 v2.4.1 h1:H0TmLt7/KmzlrDOpa1F+zr0Tk90PbJYBfsVUmRLrf9Y=
-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=
-gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
-gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
-rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=

metadata/context.go

@@ -0,0 +1,39 @@
+// Package metadata is a way of defining message headers
+package metadata
+
+import (
+	"context"
+)
+
+// 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
+}
+
+// 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))
+	}
+	return context.WithValue(ctx, metadataKey{}, Merge(md, pmd, overwrite))
+}

metadata/metadata.go

@@ -4,6 +4,7 @@ package metadata
 import (
 	"context"
 	"net/textproto"
+	"sort"
 )
 
 type metadataKey struct{}
@@ -18,6 +19,35 @@ var (
 	DefaultMetadataSize = 6
 )
 
+type Iterator struct {
+	cur  int
+	cnt  int
+	keys []string
+	md   Metadata
+}
+
+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
+}
+
+// Iterate returns run user func with map key, val sorted by key
+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
@@ -83,19 +113,6 @@ func Get(ctx context.Context, key string) (string, bool) {
 	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 {
@@ -104,25 +121,10 @@ func New(size int) Metadata {
 	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 +133,5 @@ func MergeContext(ctx context.Context, pmd Metadata, overwrite bool) context.Con
 			nmd.Del(key)
 		}
 	}
-	return context.WithValue(ctx, metadataKey{}, nmd)
+	return nmd
 }

metadata/metadata_test.go

@@ -2,10 +2,40 @@ package metadata
 
 import (
 	"context"
+	"fmt"
 	"reflect"
 	"testing"
 )
 
+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")

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/meter.go

@@ -0,0 +1,126 @@
+// Package meter is for instrumentation
+package meter
+
+import (
+	"io"
+	"sort"
+	"time"
+)
+
+var (
+	// DefaultMeter is the default meter
+	DefaultMeter Meter = NewMeter()
+	// DefaultAddress data will be made available on this host:port
+	DefaultAddress = ":9090"
+	// DefaultPath the meter endpoint where the Meter data will be made available
+	DefaultPath = "/metrics"
+	// timingObjectives is the default spread of stats we maintain for timings / histograms:
+	//defaultTimingObjectives = map[float64]float64{0.0: 0, 0.5: 0.05, 0.75: 0.04, 0.90: 0.03, 0.95: 0.02, 0.98: 0.001, 1: 0}
+	// default metric prefix
+	DefaultMetricPrefix = "micro_"
+	// default label prefix
+	DefaultLabelPrefix = "micro_"
+)
+
+// Meter is an interface for collecting and instrumenting metrics
+type Meter interface {
+	Init(...Option) error
+	Counter(string, ...Option) Counter
+	FloatCounter(string, ...Option) FloatCounter
+	Gauge(string, func() float64, ...Option) Gauge
+	Set(...Option) Meter
+	Histogram(string, ...Option) Histogram
+	Summary(string, ...Option) Summary
+	SummaryExt(string, time.Duration, []float64, ...Option) Summary
+	Write(io.Writer, bool) error
+	Options() Options
+	String() string
+}
+
+// Counter is a counter
+type Counter interface {
+	Add(int)
+	Dec()
+	Get() uint64
+	Inc()
+	Set(uint64)
+}
+
+// FloatCounter is a float64 counter
+type FloatCounter interface {
+	Add(float64)
+	Get() float64
+	Set(float64)
+	Sub(float64)
+}
+
+// Gauge is a float64 gauge
+type Gauge interface {
+	Get() float64
+}
+
+// Histogram is a histogram for non-negative values with automatically created buckets
+type Histogram interface {
+	Reset()
+	Update(float64)
+	UpdateDuration(time.Time)
+	// VisitNonZeroBuckets(f func(vmrange string, count uint64))
+}
+
+// Summary is the summary
+type Summary interface {
+	Update(float64)
+	UpdateDuration(time.Time)
+}
+
+type Labels struct {
+	keys []string
+	vals []string
+}
+
+func (ls Labels) Len() int {
+	return len(ls.keys)
+}
+
+func (ls Labels) Swap(i, j int) {
+	ls.keys[i], ls.keys[j] = ls.keys[j], ls.keys[i]
+	ls.vals[i], ls.vals[j] = ls.vals[j], ls.vals[i]
+}
+
+func (ls Labels) Less(i, j int) bool {
+	return ls.vals[i] < ls.vals[j]
+}
+
+func (ls Labels) Sort() {
+	sort.Sort(ls)
+}
+
+func (ls Labels) Append(nls Labels) Labels {
+	for n := range nls.keys {
+		ls.keys = append(ls.keys, nls.keys[n])
+		ls.vals = append(ls.vals, nls.vals[n])
+	}
+	return ls
+}
+
+type LabelIter struct {
+	labels Labels
+	cnt    int
+	cur    int
+}
+
+func (ls Labels) Iter() *LabelIter {
+	ls.Sort()
+	return &LabelIter{labels: ls, cnt: len(ls.keys)}
+}
+
+func (iter *LabelIter) Next(k, v *string) bool {
+	if iter.cur+1 > iter.cnt {
+		return false
+	}
+
+	*k = iter.labels.keys[iter.cur]
+	*v = iter.labels.vals[iter.cur]
+	iter.cur++
+	return true
+}

meter/meter_test.go

@@ -0,0 +1,63 @@
+package meter
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNoopMeter(t *testing.T) {
+	meter := NewMeter(Path("/noop"))
+	assert.NotNil(t, meter)
+	assert.Equal(t, "/noop", meter.Options().Path)
+	assert.Implements(t, new(Meter), meter)
+
+	cnt := meter.Counter("counter", Label("server", "noop"))
+	cnt.Inc()
+
+}
+
+func TestLabels(t *testing.T) {
+	var ls Labels
+	ls.keys = []string{"type", "server"}
+	ls.vals = []string{"noop", "http"}
+
+	ls.Sort()
+
+	if ls.keys[0] != "server" || ls.vals[0] != "http" {
+		t.Fatalf("sort error: %v", ls)
+	}
+}
+
+func TestLabelsAppend(t *testing.T) {
+	var ls Labels
+	ls.keys = []string{"type", "server"}
+	ls.vals = []string{"noop", "http"}
+
+	var nls Labels
+	nls.keys = []string{"registry"}
+	nls.vals = []string{"gossip"}
+	ls = ls.Append(nls)
+
+	ls.Sort()
+
+	if ls.keys[0] != "registry" || ls.vals[0] != "gossip" {
+		t.Fatalf("append error: %v", ls)
+	}
+}
+
+func TestIterator(t *testing.T) {
+	var ls Labels
+	ls.keys = []string{"type", "server", "registry"}
+	ls.vals = []string{"noop", "http", "gossip"}
+
+	iter := ls.Iter()
+	var k, v string
+	cnt := 0
+	for iter.Next(&k, &v) {
+		if cnt == 1 && (k != "server" || v != "http") {
+			t.Fatalf("iter error: %s != %s || %s != %s", k, "server", v, "http")
+		}
+		cnt++
+	}
+}

meter/noop.go

@@ -0,0 +1,158 @@
+package meter
+
+import (
+	"io"
+	"time"
+)
+
+// NoopMeter is an noop implementation of Meter
+type noopMeter struct {
+	opts   Options
+	labels Labels
+}
+
+// NewMeter returns a configured noop reporter:
+func NewMeter(opts ...Option) Meter {
+	return &noopMeter{opts: NewOptions(opts...)}
+}
+
+// Init initialize options
+func (r *noopMeter) Init(opts ...Option) error {
+	for _, o := range opts {
+		o(&r.opts)
+	}
+	return nil
+}
+
+// Counter implements the Meter interface
+func (r *noopMeter) Counter(name string, opts ...Option) Counter {
+	options := Options{}
+	for _, o := range opts {
+		o(&options)
+	}
+	return &noopCounter{labels: options.Labels}
+}
+
+// FloatCounter implements the Meter interface
+func (r *noopMeter) FloatCounter(name string, opts ...Option) FloatCounter {
+	return &noopFloatCounter{}
+}
+
+// Gauge implements the Meter interface
+func (r *noopMeter) Gauge(name string, f func() float64, opts ...Option) Gauge {
+	return &noopGauge{}
+}
+
+// Summary implements the Meter interface
+func (r *noopMeter) Summary(name string, opts ...Option) Summary {
+	return &noopSummary{}
+}
+
+// SummaryExt implements the Meter interface
+func (r *noopMeter) SummaryExt(name string, window time.Duration, quantiles []float64, opts ...Option) Summary {
+	return &noopSummary{}
+}
+
+// Histogram implements the Meter interface
+func (r *noopMeter) Histogram(name string, opts ...Option) Histogram {
+	return &noopHistogram{}
+}
+
+// Set implements the Meter interface
+func (r *noopMeter) Set(opts ...Option) Meter {
+	m := &noopMeter{opts: r.opts}
+
+	for _, o := range opts {
+		o(&m.opts)
+	}
+
+	return m
+}
+
+func (r *noopMeter) Write(w io.Writer, withProcessMetrics bool) error {
+	return nil
+}
+
+// Options implements the Meter interface
+func (r *noopMeter) Options() Options {
+	return r.opts
+}
+
+// String implements the Meter interface
+func (r *noopMeter) String() string {
+	return "noop"
+}
+
+type noopCounter struct {
+	labels Labels
+}
+
+func (r *noopCounter) Add(int) {
+
+}
+
+func (r *noopCounter) Dec() {
+
+}
+
+func (r *noopCounter) Get() uint64 {
+	return 0
+}
+
+func (r *noopCounter) Inc() {
+
+}
+
+func (r *noopCounter) Set(uint64) {
+
+}
+
+type noopFloatCounter struct{}
+
+func (r *noopFloatCounter) Add(float64) {
+
+}
+
+func (r *noopFloatCounter) Get() float64 {
+	return 0
+}
+
+func (r *noopFloatCounter) Set(float64) {
+
+}
+
+func (r *noopFloatCounter) Sub(float64) {
+
+}
+
+type noopGauge struct{}
+
+func (r *noopGauge) Get() float64 {
+	return 0
+}
+
+type noopSummary struct{}
+
+func (r *noopSummary) Update(float64) {
+
+}
+
+func (r *noopSummary) UpdateDuration(time.Time) {
+
+}
+
+type noopHistogram struct{}
+
+func (r *noopHistogram) Reset() {
+
+}
+
+func (r *noopHistogram) Update(float64) {
+
+}
+
+func (r *noopHistogram) UpdateDuration(time.Time) {
+
+}
+
+//func (r *noopHistogram) VisitNonZeroBuckets(f func(vmrange string, count uint64)) {}

meter/options.go

@@ -0,0 +1,94 @@
+package meter
+
+import (
+	"context"
+
+	"github.com/unistack-org/micro/v3/logger"
+)
+
+// Option powers the configuration for metrics implementations:
+type Option func(*Options)
+
+// Options for metrics implementations:
+type Options struct {
+	Address string
+	Path    string
+	Labels  Labels
+	//TimingObjectives map[float64]float64
+	Logger       logger.Logger
+	Context      context.Context
+	MetricPrefix string
+	LabelPrefix  string
+}
+
+// NewOptions prepares a set of options:
+func NewOptions(opt ...Option) Options {
+	opts := Options{
+		Address:      DefaultAddress,
+		Path:         DefaultPath,
+		Context:      context.Background(),
+		Logger:       logger.DefaultLogger,
+		MetricPrefix: DefaultMetricPrefix,
+		LabelPrefix:  DefaultLabelPrefix,
+	}
+
+	for _, o := range opt {
+		o(&opts)
+	}
+
+	return opts
+}
+
+// Context sets the metrics context
+func Context(ctx context.Context) Option {
+	return func(o *Options) {
+		o.Context = ctx
+	}
+}
+
+// Path used to serve metrics over HTTP
+func Path(value string) Option {
+	return func(o *Options) {
+		o.Path = value
+	}
+}
+
+// Address is the listen address to serve metrics
+func Address(value string) Option {
+	return func(o *Options) {
+		o.Address = value
+	}
+}
+
+/*
+// Labels be added to every metric
+func Labels(labels []string) Option {
+	return func(o *Options) {
+		o.Labels = labels
+	}
+}
+*/
+
+/*
+// TimingObjectives defines the desired spread of statistics for histogram / timing metrics:
+func TimingObjectives(value map[float64]float64) Option {
+	return func(o *Options) {
+		o.TimingObjectives = value
+	}
+}
+*/
+
+// Logger sets the logger
+func Logger(l logger.Logger) Option {
+	return func(o *Options) {
+		o.Logger = l
+	}
+}
+
+// Label sets the label
+func Label(key, val string) Option {
+	return func(o *Options) {
+		o.Labels.keys = append(o.Labels.keys, key)
+		o.Labels.vals = append(o.Labels.vals, val)
+	}
+}

metrics/noop.go

@@ -1,47 +0,0 @@
-package metrics
-
-import (
-	"time"
-
-	"github.com/unistack-org/micro/v3/metadata"
-)
-
-// NoopReporter is an noop implementation of Reporter:
-type noopReporter struct {
-	opts Options
-}
-
-// NewReporter returns a configured noop reporter:
-func NewReporter(opts ...Option) Reporter {
-	return &noopReporter{
-		opts: NewOptions(opts...),
-	}
-}
-
-// Init initialize options
-func (r *noopReporter) Init(opts ...Option) error {
-	for _, o := range opts {
-		o(&r.opts)
-	}
-	return nil
-}
-
-// Count implements the Reporter interface Count method:
-func (r *noopReporter) Count(metricName string, value int64, md metadata.Metadata) error {
-	return nil
-}
-
-// Gauge implements the Reporter interface Gauge method:
-func (r *noopReporter) Gauge(metricName string, value float64, md metadata.Metadata) error {
-	return nil
-}
-
-// Timing implements the Reporter interface Timing method:
-func (r *noopReporter) Timing(metricName string, value time.Duration, md metadata.Metadata) error {
-	return nil
-}
-
-// Options implements the Reporter interface Optios method:
-func (r *noopReporter) Options() Options {
-	return r.opts
-}

metrics/options.go

@@ -1,89 +0,0 @@
-package metrics
-
-import (
-	"context"
-
-	"github.com/unistack-org/micro/v3/logger"
-	"github.com/unistack-org/micro/v3/metadata"
-)
-
-var (
-	// The Prometheus metrics will be made available on this port:
-	defaultPrometheusListenAddress = ":9000"
-	// This is the endpoint where the Prometheus metrics will be made available ("/metrics" is the default with Prometheus):
-	defaultPath = "/metrics"
-	// timingObjectives is the default spread of stats we maintain for timings / histograms:
-	defaultTimingObjectives = map[float64]float64{0.0: 0, 0.5: 0.05, 0.75: 0.04, 0.90: 0.03, 0.95: 0.02, 0.98: 0.001, 1: 0}
-)
-
-// Option powers the configuration for metrics implementations:
-type Option func(*Options)
-
-// Options for metrics implementations:
-type Options struct {
-	Address          string
-	Path             string
-	DefaultTags      metadata.Metadata
-	TimingObjectives map[float64]float64
-	Logger           logger.Logger
-	Context          context.Context
-}
-
-// NewOptions prepares a set of options:
-func NewOptions(opt ...Option) Options {
-	opts := Options{
-		Address:          defaultPrometheusListenAddress,
-		DefaultTags:      metadata.New(2),
-		Path:             defaultPath,
-		TimingObjectives: defaultTimingObjectives,
-		Context:          context.Background(),
-	}
-
-	for _, o := range opt {
-		o(&opts)
-	}
-
-	return opts
-}
-
-// Cntext sets the metrics context
-func Context(ctx context.Context) Option {
-	return func(o *Options) {
-		o.Context = ctx
-	}
-}
-
-// Path used to serve metrics over HTTP:
-func Path(value string) Option {
-	return func(o *Options) {
-		o.Path = value
-	}
-}
-
-// Address is the listen address to serve metrics on:
-func Address(value string) Option {
-	return func(o *Options) {
-		o.Address = value
-	}
-}
-
-// DefaultTags will be added to every metric:
-func DefaultTags(md metadata.Metadata) Option {
-	return func(o *Options) {
-		o.DefaultTags = metadata.Copy(md)
-	}
-}
-
-// TimingObjectives defines the desired spread of statistics for histogram / timing metrics:
-func TimingObjectives(value map[float64]float64) Option {
-	return func(o *Options) {
-		o.TimingObjectives = value
-	}
-}
-
-// Logger sets the logger
-func Logger(l logger.Logger) Option {
-	return func(o *Options) {
-		o.Logger = l
-	}
-}

metrics/reporter.go

@@ -1,21 +0,0 @@
-// Package metrics is for instrumentation and debugging
-package metrics
-
-import (
-	"time"
-
-	"github.com/unistack-org/micro/v3/metadata"
-)
-
-var (
-	DefaultReporter Reporter = NewReporter()
-)
-
-// Reporter is an interface for collecting and instrumenting metrics
-type Reporter interface {
-	Init(...Option) error
-	Count(id string, value int64, md metadata.Metadata) error
-	Gauge(id string, value float64, md metadata.Metadata) error
-	Timing(id string, value time.Duration, md metadata.Metadata) error
-	Options() Options
-}

metrics/reporter_test.go

@@ -1,17 +0,0 @@
-package metrics
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestNoopReporter(t *testing.T) {
-	// Make a Reporter:
-	reporter := NewReporter(Path("/noop"))
-	assert.NotNil(t, reporter)
-	assert.Equal(t, "/noop", reporter.Options().Path)
-
-	// Check that our implementation is valid:
-	assert.Implements(t, new(Reporter), reporter)
-}

metrics/wrapper/metrics_wrapper.go

@@ -1,50 +0,0 @@
-package wrapper
-
-import (
-	"context"
-	"time"
-
-	"github.com/unistack-org/micro/v3/metadata"
-	"github.com/unistack-org/micro/v3/metrics"
-	"github.com/unistack-org/micro/v3/server"
-)
-
-// Wrapper provides a HandlerFunc for metrics.Reporter implementations:
-type Wrapper struct {
-	reporter metrics.Reporter
-}
-
-// New returns a *Wrapper configured with the given metrics.Reporter:
-func New(reporter metrics.Reporter) *Wrapper {
-	return &Wrapper{
-		reporter: reporter,
-	}
-}
-
-// HandlerFunc instruments handlers registered to a service:
-func (w *Wrapper) HandlerFunc(handlerFunction server.HandlerFunc) server.HandlerFunc {
-	return func(ctx context.Context, req server.Request, rsp interface{}) error {
-
-		// Build some tags to describe the call:
-		tags := metadata.New(2)
-		tags.Set("method", req.Method())
-
-		// Start the clock:
-		callTime := time.Now()
-
-		// Run the handlerFunction:
-		err := handlerFunction(ctx, req, rsp)
-
-		// Add a result tag:
-		if err != nil {
-			tags["status"] = "failure"
-		} else {
-			tags["status"] = "success"
-		}
-
-		// Instrument the result (if the DefaultClient has been configured):
-		w.reporter.Timing("service.handler", time.Since(callTime), tags)
-
-		return err
-	}
-}

network/options.go

@@ -3,9 +3,11 @@ package network
 import (
 	"github.com/google/uuid"
 	"github.com/unistack-org/micro/v3/logger"
+	"github.com/unistack-org/micro/v3/meter"
 	"github.com/unistack-org/micro/v3/network/tunnel"
 	"github.com/unistack-org/micro/v3/proxy"
 	"github.com/unistack-org/micro/v3/router"
+	"github.com/unistack-org/micro/v3/tracer"
 )
 
 // Option func
@@ -31,6 +33,10 @@ type Options struct {
 	Proxy proxy.Proxy
 	// Logger
 	Logger logger.Logger
+	// Meter
+	Meter meter.Meter
+	// Tracer
+	Tracer tracer.Tracer
 }
 
 // Id sets the id of the network node
@@ -96,11 +102,34 @@ func Logger(l logger.Logger) Option {
 	}
 }
 
-// DefaultOptions returns network default options
-func DefaultOptions() Options {
-	return Options{
+// Meter sets the meter
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
+// Tracer to be used for tracing
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}
+
+// NewOptions returns network default options
+func NewOptions(opts ...Option) Options {
+	options := Options{
 		Id:      uuid.New().String(),
 		Name:    "go.micro",
 		Address: ":0",
+		Logger:  logger.DefaultLogger,
+		Meter:   meter.DefaultMeter,
+		Tracer:  tracer.DefaultTracer,
 	}
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	return options
 }

network/transport/options.go

@@ -7,6 +7,8 @@ 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"
 )
 
 type Options struct {
@@ -26,6 +28,10 @@ type Options struct {
 	Timeout time.Duration
 	// Logger sets the logger
 	Logger logger.Logger
+	// Meter sets the meter
+	Meter meter.Meter
+	// Tracer
+	Tracer tracer.Tracer
 	// Other options for implementations of the interface
 	// can be stored in a context
 	Context context.Context
@@ -35,6 +41,8 @@ type Options struct {
 func NewOptions(opts ...Option) Options {
 	options := Options{
 		Logger:  logger.DefaultLogger,
+		Meter:   meter.DefaultMeter,
+		Tracer:  tracer.DefaultTracer,
 		Context: context.Background(),
 	}
 
@@ -112,6 +120,13 @@ func Logger(l logger.Logger) Option {
 	}
 }
 
+// Meter sets the meter
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
 // Context sets the context
 func Context(ctx context.Context) Option {
 	return func(o *Options) {
@@ -134,14 +149,6 @@ func Timeout(t time.Duration) Option {
 	}
 }
 
-// Use secure communication. If TLSConfig is not specified we
-// use InsecureSkipVerify and generate a self signed cert
-func Secure(b bool) Option {
-	return func(o *Options) {
-		o.Secure = b
-	}
-}
-
 // TLSConfig to be used for the transport.
 func TLSConfig(t *tls.Config) Option {
 	return func(o *Options) {
@@ -162,3 +169,10 @@ func WithTimeout(d time.Duration) DialOption {
 		o.Timeout = d
 	}
 }
+
+// Tracer to be used for tracing
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}

network/tunnel/options.go

@@ -5,7 +5,9 @@ import (
 
 	"github.com/google/uuid"
 	"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/tracer"
 )
 
 var (
@@ -32,6 +34,10 @@ type Options struct {
 	Transport transport.Transport
 	// Logger
 	Logger logger.Logger
+	// Meter
+	Meter meter.Meter
+	// Tracer
+	Tracer tracer.Tracer
 }
 
 // DialOption func
@@ -74,6 +80,13 @@ func Logger(l logger.Logger) Option {
 	}
 }
 
+// Meter sets the meter
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
 // Address sets the tunnel address
 func Address(a string) Option {
 	return func(o *Options) {
@@ -152,9 +165,19 @@ func NewOptions(opts ...Option) Options {
 		Id:      uuid.New().String(),
 		Address: DefaultAddress,
 		Token:   DefaultToken,
+		Logger:  logger.DefaultLogger,
+		Meter:   meter.DefaultMeter,
+		Tracer:  tracer.DefaultTracer,
 	}
 	for _, o := range opts {
 		o(&options)
 	}
 	return options
 }
+
+// Tracer to be used for tracing
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}

options.go

@@ -11,6 +11,7 @@ import (
 	"github.com/unistack-org/micro/v3/debug/profile"
 	"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/registry"
 	"github.com/unistack-org/micro/v3/router"
 	"github.com/unistack-org/micro/v3/runtime"
@@ -25,11 +26,13 @@ type Options struct {
 	Auth     auth.Auth
 	Broker   broker.Broker
 	Logger   logger.Logger
+	Meter    meter.Meter
 	Configs  []config.Config
 	Client   client.Client
 	Server   server.Server
 	Store    store.Store
 	Registry registry.Registry
+	Tracer   tracer.Tracer
 	Router   router.Router
 	Runtime  runtime.Runtime
 	Profile  profile.Profile
@@ -56,6 +59,8 @@ func NewOptions(opts ...Option) Options {
 		Router:   router.DefaultRouter,
 		Auth:     auth.DefaultAuth,
 		Logger:   logger.DefaultLogger,
+		Tracer:   tracer.DefaultTracer,
+		Meter:    meter.DefaultMeter,
 		Configs:  []config.Config{config.DefaultConfig},
 		Store:    store.DefaultStore,
 		//Runtime   runtime.Runtime
@@ -129,6 +134,13 @@ func Logger(l logger.Logger) Option {
 	}
 }
 
+// Meter set the meter to use
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
 // Registry sets the registry for the service
 // and the underlying components
 func Registry(r registry.Registry) Option {
@@ -152,10 +164,13 @@ func Registry(r registry.Registry) Option {
 // Tracer sets the tracer for the service
 func Tracer(t tracer.Tracer) Option {
 	return func(o *Options) {
+		o.Tracer = t
 		if o.Server != nil {
-			//todo client trace
 			o.Server.Init(server.Tracer(t))
 		}
+		if o.Client != nil {
+			o.Client.Init(client.Tracer(t))
+		}
 	}
 }
 

proxy/options.go

@@ -4,7 +4,9 @@ package proxy
 import (
 	"github.com/unistack-org/micro/v3/client"
 	"github.com/unistack-org/micro/v3/logger"
+	"github.com/unistack-org/micro/v3/meter"
 	"github.com/unistack-org/micro/v3/router"
+	"github.com/unistack-org/micro/v3/tracer"
 )
 
 // Options for proxy
@@ -19,11 +21,29 @@ type Options struct {
 	Links map[string]client.Client
 	// Logger
 	Logger logger.Logger
+	// Meter
+	Meter meter.Meter
+	// Tracer
+	Tracer tracer.Tracer
 }
 
 // Option func signature
 type Option func(o *Options)
 
+func NewOptions(opts ...Option) Options {
+	options := Options{
+		Logger: logger.DefaultLogger,
+		Meter:  meter.DefaultMeter,
+		Tracer: tracer.DefaultTracer,
+	}
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	return options
+}
+
 // WithEndpoint sets a proxy endpoint
 func WithEndpoint(e string) Option {
 	return func(o *Options) {
@@ -52,6 +72,13 @@ func WithLogger(l logger.Logger) Option {
 	}
 }
 
+// WithMeter specifies the meter to use
+func WithMeter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
 // WithLink sets a link for outbound requests
 func WithLink(name string, c client.Client) Option {
 	return func(o *Options) {
@@ -61,3 +88,10 @@ func WithLink(name string, c client.Client) Option {
 		o.Links[name] = c
 	}
 }
+
+// Tracer to be used for tracing
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}

registry/options.go

@@ -6,16 +6,21 @@ import (
 	"time"
 
 	"github.com/unistack-org/micro/v3/logger"
+	"github.com/unistack-org/micro/v3/meter"
+	"github.com/unistack-org/micro/v3/tracer"
 )
 
 type Options struct {
 	Addrs     []string
 	Timeout   time.Duration
-	Secure    bool
 	TLSConfig *tls.Config
 
-	// Logger imp
+	// Logger that will be used
 	Logger logger.Logger
+	// Meter that will be used
+	Meter meter.Meter
+	// Tracer
+	Tracer tracer.Tracer
 	// Other options for implementations of the interface
 	// can be stored in a context
 	Context context.Context
@@ -24,6 +29,8 @@ type Options struct {
 func NewOptions(opts ...Option) Options {
 	options := Options{
 		Logger:  logger.DefaultLogger,
+		Meter:   meter.DefaultMeter,
+		Tracer:  tracer.DefaultTracer,
 		Context: context.Background(),
 	}
 	for _, o := range opts {
@@ -142,13 +149,6 @@ func Timeout(t time.Duration) Option {
 	}
 }
 
-// Secure communication with the registry
-func Secure(b bool) Option {
-	return func(o *Options) {
-		o.Secure = b
-	}
-}
-
 // Logger sets the logger
 func Logger(l logger.Logger) Option {
 	return func(o *Options) {
@@ -156,6 +156,20 @@ func Logger(l logger.Logger) Option {
 	}
 }
 
+// Meter sets the meter
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
+// Tracer sets the tracer
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}
+
 // Context sets the context
 func Context(ctx context.Context) Option {
 	return func(o *Options) {

server/options.go

@@ -12,6 +12,7 @@ import (
 	"github.com/unistack-org/micro/v3/codec"
 	"github.com/unistack-org/micro/v3/logger"
 	"github.com/unistack-org/micro/v3/metadata"
+	"github.com/unistack-org/micro/v3/meter"
 	"github.com/unistack-org/micro/v3/network/transport"
 	"github.com/unistack-org/micro/v3/registry"
 	"github.com/unistack-org/micro/v3/tracer"
@@ -28,6 +29,7 @@ type Options struct {
 	Tracer       tracer.Tracer
 	Auth         auth.Auth
 	Logger       logger.Logger
+	Meter        meter.Meter
 	Transport    transport.Transport
 	Metadata     metadata.Metadata
 	Name         string
@@ -78,6 +80,7 @@ func NewOptions(opts ...Option) Options {
 		RegisterTTL:      DefaultRegisterTTL,
 		RegisterCheck:    DefaultRegisterCheck,
 		Logger:           logger.DefaultLogger,
+		Meter:            meter.DefaultMeter,
 		Tracer:           tracer.DefaultTracer,
 		Broker:           broker.DefaultBroker,
 		Registry:         registry.DefaultRegistry,
@@ -117,6 +120,13 @@ func Logger(l logger.Logger) Option {
 	}
 }
 
+// Meter sets the meter option
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
 // Id unique server id
 func Id(id string) Option {
 	return func(o *Options) {
@@ -235,7 +245,6 @@ func TLSConfig(t *tls.Config) Option {
 
 		// set the transport tls
 		o.Transport.Init(
-			transport.Secure(true),
 			transport.TLSConfig(t),
 		)
 	}

store/context.go

@@ -32,3 +32,53 @@ func SetOption(k, v interface{}) Option {
 		o.Context = context.WithValue(o.Context, k, v)
 	}
 }
+
+// SetReadOption returns a function to setup a context with given value
+func SetReadOption(k, v interface{}) ReadOption {
+	return func(o *ReadOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}
+
+// SetWriteOption returns a function to setup a context with given value
+func SetWriteOption(k, v interface{}) WriteOption {
+	return func(o *WriteOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}
+
+// SetListOption returns a function to setup a context with given value
+func SetListOption(k, v interface{}) ListOption {
+	return func(o *ListOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}
+
+// SetDeleteOption returns a function to setup a context with given value
+func SetDeleteOption(k, v interface{}) DeleteOption {
+	return func(o *DeleteOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}
+
+// SetExistsOption returns a function to setup a context with given value
+func SetExistsOption(k, v interface{}) ExistsOption {
+	return func(o *ExistsOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}

store/noop.go

@@ -29,7 +29,7 @@ func (n *noopStore) String() string {
 }
 
 // Read reads store value by key
-func (n *noopStore) Exists(ctx context.Context, key string) error {
+func (n *noopStore) Exists(ctx context.Context, key string, opts ...ExistsOption) error {
 	return ErrNotFound
 }
 

store/options.go

@@ -2,11 +2,14 @@ package store
 
 import (
 	"context"
+	"crypto/tls"
 	"time"
 
 	"github.com/unistack-org/micro/v3/codec"
 	"github.com/unistack-org/micro/v3/logger"
 	"github.com/unistack-org/micro/v3/metadata"
+	"github.com/unistack-org/micro/v3/meter"
+	"github.com/unistack-org/micro/v3/tracer"
 )
 
 // Options contains configuration for the Store
@@ -23,6 +26,13 @@ type Options struct {
 	Codec codec.Codec
 	// Logger the logger
 	Logger logger.Logger
+	// Meter the meter
+	Meter meter.Meter
+	// Tracer the tacer
+	Tracer tracer.Tracer
+	// TLSConfig specifies tls.Config for secure
+	TLSConfig *tls.Config
+
 	// Context should contain all implementation specific options, using context.WithValue.
 	Context context.Context
 }
@@ -33,6 +43,8 @@ func NewOptions(opts ...Option) Options {
 		Logger:  logger.DefaultLogger,
 		Context: context.Background(),
 		Codec:   codec.DefaultCodec,
+		Tracer:  tracer.DefaultTracer,
+		Meter:   meter.DefaultMeter,
 	}
 	for _, o := range opts {
 		o(&options)
@@ -43,6 +55,13 @@ func NewOptions(opts ...Option) Options {
 // Option sets values in Options
 type Option func(o *Options)
 
+// TLSConfig specifies a *tls.Config
+func TLSConfig(t *tls.Config) Option {
+	return func(o *Options) {
+		o.TLSConfig = t
+	}
+}
+
 // Context pass context to store
 func Context(ctx context.Context) Option {
 	return func(o *Options) {
@@ -64,6 +83,20 @@ func Logger(l logger.Logger) Option {
 	}
 }
 
+// Meter sets the meter
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
+// Tracer sets the tracer
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}
+
 // Nodes contains the addresses or other connection information of the backing storage.
 // For example, an etcd implementation would contain the nodes of the cluster.
 // A SQL implementation could contain one or more connection strings.
@@ -98,8 +131,10 @@ func NewReadOptions(opts ...ReadOption) ReadOptions {
 
 // ReadOptions configures an individual Read operation
 type ReadOptions struct {
-	Database string
-	Table    string
+	Database  string
+	Table     string
+	Namespace string
+	Context   context.Context
 }
 
 // ReadOption sets values in ReadOptions
@@ -124,10 +159,12 @@ func NewWriteOptions(opts ...WriteOption) WriteOptions {
 
 // WriteOptions configures an individual Write operation
 type WriteOptions struct {
-	Database string
-	Table    string
-	TTL      time.Duration
-	Metadata metadata.Metadata
+	Database  string
+	Table     string
+	TTL       time.Duration
+	Metadata  metadata.Metadata
+	Namespace string
+	Context   context.Context
 }
 
 // WriteOption sets values in WriteOptions
@@ -166,7 +203,10 @@ func NewDeleteOptions(opts ...DeleteOption) DeleteOptions {
 
 // DeleteOptions configures an individual Delete operation
 type DeleteOptions struct {
-	Database, Table string
+	Database  string
+	Table     string
+	Namespace string
+	Context   context.Context
 }
 
 // DeleteOption sets values in DeleteOptions
@@ -200,7 +240,9 @@ type ListOptions struct {
 	// Limit limits the number of returned keys
 	Limit uint
 	// Offset when combined with Limit supports pagination
-	Offset uint
+	Offset    uint
+	Namespace string
+	Context   context.Context
 }
 
 // ListOption sets values in ListOptions
@@ -241,3 +283,20 @@ func ListOffset(o uint) ListOption {
 		l.Offset = o
 	}
 }
+
+type ExistsOption func(*ExistsOptions)
+
+type ExistsOptions struct {
+	Namespace string
+	Context   context.Context
+}
+
+func NewExistsOptions(opts ...ExistsOption) ExistsOptions {
+	options := ExistsOptions{
+		Context: context.Background(),
+	}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}

store/store.go

@@ -12,6 +12,8 @@ import (
 var (
 	// ErrNotFound is returned when a key doesn't exist
 	ErrNotFound = errors.New("not found")
+	// ErrInvalidKey is returned when a key has empty or have invalid format
+	ErrInvalidKey = errors.New("invalid key")
 	// DefaultStore is the global default store
 	DefaultStore Store = NewStore()
 )
@@ -25,7 +27,7 @@ type Store interface {
 	// Options allows you to view the current options.
 	Options() Options
 	// Exists check that key exists in store
-	Exists(ctx context.Context, key string) error
+	Exists(ctx context.Context, key string, opts ...ExistsOption) error
 	// Read reads a single key name to provided value with optional ReadOptions
 	Read(ctx context.Context, key string, val interface{}, opts ...ReadOption) error
 	// Write writes a value to key name to the store with optional WriteOption

sync/options.go

@@ -4,16 +4,34 @@ import (
 	"time"
 
 	"github.com/unistack-org/micro/v3/logger"
+	"github.com/unistack-org/micro/v3/meter"
+	"github.com/unistack-org/micro/v3/tracer"
 )
 
 type Options struct {
 	Nodes  []string
 	Prefix string
 	Logger logger.Logger
+	Tracer tracer.Tracer
+	Meter  meter.Meter
 }
 
 type Option func(o *Options)
 
+func NewOptions(opts ...Option) Options {
+	options := Options{
+		Logger: logger.DefaultLogger,
+		Meter:  meter.DefaultMeter,
+		Tracer: tracer.DefaultTracer,
+	}
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	return options
+}
+
 type LeaderOptions struct{}
 
 type LeaderOption func(o *LeaderOptions)
@@ -32,6 +50,20 @@ func Logger(l logger.Logger) Option {
 	}
 }
 
+// Meter sets the logger
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
+// Tracer sets the tracer
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}
+
 // Nodes sets the addresses to use
 func Nodes(a ...string) Option {
 	return func(o *Options) {

util/reflect/reflect.go

@@ -0,0 +1,121 @@
+package reflect
+
+import (
+	"errors"
+	"reflect"
+)
+
+var (
+	ErrInvalidStruct = errors.New("invalid struct specified")
+)
+
+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
+}
+
+func StructFields(src interface{}) ([]reflect.StructField, error) {
+	var fields []reflect.StructField
+
+	sv := reflect.ValueOf(src)
+	if sv.Kind() == reflect.Ptr {
+		sv = sv.Elem()
+	}
+	if sv.Kind() != reflect.Struct {
+		return nil, ErrInvalidStruct
+	}
+
+	typ := sv.Type()
+	for idx := 0; idx < typ.NumField(); idx++ {
+		fld := typ.Field(idx)
+		val := sv.Field(idx)
+		if !val.CanSet() || len(fld.PkgPath) != 0 {
+			continue
+		}
+		if val.Kind() == reflect.Struct {
+			infields, err := StructFields(val.Interface())
+			if err != nil {
+				return nil, err
+			}
+			fields = append(fields, infields...)
+		} else {
+			fields = append(fields, fld)
+		}
+	}
+
+	return fields, nil
+}
+
+// CopyDefaults for a from b
+// a and b should be pointers to the same kind of struct
+func CopyDefaults(a, b interface{}) {
+	pt := reflect.TypeOf(a)
+	t := pt.Elem()
+	va := reflect.ValueOf(a).Elem()
+	vb := reflect.ValueOf(b).Elem()
+	for i := 0; i < t.NumField(); i++ {
+		aField := va.Field(i)
+		if aField.CanSet() {
+			bField := vb.Field(i)
+			aField.Set(bField)
+		}
+	}
+}
+
+// CopyFrom sets the public members of a from b
+// a and b should be pointers to structs
+// a can be a different type from b
+// Only the Fields which have the same name and assignable type on a
+// and b will be set.
+func CopyFrom(a, b interface{}) {
+	ta := reflect.TypeOf(a).Elem()
+	tb := reflect.TypeOf(b).Elem()
+	va := reflect.ValueOf(a).Elem()
+	vb := reflect.ValueOf(b).Elem()
+	for i := 0; i < tb.NumField(); i++ {
+		bField := vb.Field(i)
+		tbField := tb.Field(i)
+		name := tbField.Name
+		aField := va.FieldByName(name)
+		taField, found := ta.FieldByName(name)
+		if found && aField.IsValid() && bField.IsValid() && aField.CanSet() && tbField.Type.AssignableTo(taField.Type) {
+			aField.Set(bField)
+		}
+	}
+}

util/sync/sync.go

@@ -96,7 +96,7 @@ func (c *syncStore) List(ctx context.Context, opts ...store.ListOption) ([]strin
 	return c.syncOpts.Stores[0].List(ctx, opts...)
 }
 
-func (c *syncStore) Exists(ctx context.Context, key string) error {
+func (c *syncStore) Exists(ctx context.Context, key string, opts ...store.ExistsOption) error {
 	return c.syncOpts.Stores[0].Exists(ctx, key)
 }