Add Config to service options (#1336)

Co-authored-by: Ben Toogood <ben@micro.mu>
Co-authored-by: Asim Aslam <asim@aslam.me>

config/cmd/cmd.go

@@ -7,12 +7,13 @@ import (
 	"strings"
 	"time"
 
-	"github.com/micro/go-micro/v2/auth/provider"
-
 	"github.com/micro/go-micro/v2/auth"
+	"github.com/micro/go-micro/v2/auth/provider"
 	"github.com/micro/go-micro/v2/broker"
 	"github.com/micro/go-micro/v2/client"
 	"github.com/micro/go-micro/v2/client/selector"
+	"github.com/micro/go-micro/v2/config"
+	configSrv "github.com/micro/go-micro/v2/config/source/service"
 	"github.com/micro/go-micro/v2/debug/profile"
 	"github.com/micro/go-micro/v2/debug/profile/http"
 	"github.com/micro/go-micro/v2/debug/profile/pprof"
@@ -305,6 +306,11 @@ var (
 			EnvVars: []string{"MICRO_AUTH_PROVIDER_SCOPE"},
 			Usage:   "The scope to be used for oauth",
 		},
+		&cli.StringFlag{
+			Name:    "config",
+			EnvVars: []string{"MICRO_CONFIG"},
+			Usage:   "The source of the config to be used to get configuration",
+		},
 	}
 
 	DefaultBrokers = map[string]func(...broker.Option) broker.Broker{
@@ -373,6 +379,10 @@ var (
 		"http":  http.NewProfile,
 		"pprof": pprof.NewProfile,
 	}
+
+	DefaultConfigs = map[string]func(...config.Option) (config.Config, error){
+		"service": config.NewConfig,
+	}
 )
 
 func init() {
@@ -392,6 +402,7 @@ func newCmd(opts ...Option) Cmd {
 		Store:     &store.DefaultStore,
 		Tracer:    &trace.DefaultTracer,
 		Profile:   &profile.DefaultProfile,
+		Config:    &config.DefaultConfig,
 
 		Brokers:    DefaultBrokers,
 		Clients:    DefaultClients,
@@ -404,6 +415,7 @@ func newCmd(opts ...Option) Cmd {
 		Tracers:    DefaultTracers,
 		Auths:      DefaultAuths,
 		Profiles:   DefaultProfiles,
+		Configs:    DefaultConfigs,
 	}
 
 	for _, o := range opts {
@@ -700,6 +712,13 @@ func (c *cmd) Before(ctx *cli.Context) error {
 		}
 	}
 
+	if ctx.String("config") == "service" {
+		opt := config.WithSource(configSrv.NewSource())
+		if err := (*c.opts.Config).Init(opt); err != nil {
+			logger.Fatalf("Error configuring config: %v", err)
+		}
+	}
+
 	// client opts
 	if r := ctx.Int("client_retries"); r >= 0 {
 		clientOpts = append(clientOpts, client.Retries(r))

config/cmd/options.go

@@ -7,6 +7,7 @@ import (
 	"github.com/micro/go-micro/v2/broker"
 	"github.com/micro/go-micro/v2/client"
 	"github.com/micro/go-micro/v2/client/selector"
+	"github.com/micro/go-micro/v2/config"
 	"github.com/micro/go-micro/v2/debug/profile"
 	"github.com/micro/go-micro/v2/debug/trace"
 	"github.com/micro/go-micro/v2/registry"
@@ -34,6 +35,7 @@ type Options struct {
 	Tracer    *trace.Tracer
 	Auth      *auth.Auth
 	Profile   *profile.Profile
+	Config    *config.Config
 
 	Brokers    map[string]func(...broker.Option) broker.Broker
 	Clients    map[string]func(...client.Option) client.Client
@@ -46,6 +48,7 @@ type Options struct {
 	Tracers    map[string]func(...trace.Option) trace.Tracer
 	Auths      map[string]func(...auth.Option) auth.Auth
 	Profiles   map[string]func(...profile.Option) profile.Profile
+	Configs    map[string]func(...config.Option) (config.Config, error)
 
 	// Other options for implementations of the interface
 	// can be stored in a context

config/config.go

@@ -14,6 +14,8 @@ import (
 type Config interface {
 	// provide the reader.Values interface
 	reader.Values
+	// Init the config
+	Init(opts ...Option) error
 	// Stop the config loader/watcher
 	Close() error
 	// Load config sources

config/default.go

@@ -31,38 +31,40 @@ type watcher struct {
 }
 
 func newConfig(opts ...Option) (Config, error) {
-	options := Options{
+	var c config
+
+	c.Init(opts...)
+	go c.run()
+
+	return &c, nil
+}
+
+func (c *config) Init(opts ...Option) error {
+	c.opts = Options{
 		Loader: memory.NewLoader(),
 		Reader: json.NewReader(),
 	}
 
 	for _, o := range opts {
-		o(&options)
+		o(&c.opts)
 	}
 
-	if err := options.Loader.Load(options.Source...); err != nil {
-		return nil, err
-	}
-
-	snap, err := options.Loader.Snapshot()
+	err := c.opts.Loader.Load(c.opts.Source...)
 	if err != nil {
-		return nil, err
+		return err
 	}
-	vals, err := options.Reader.Values(snap.ChangeSet)
+
+	c.snap, err = c.opts.Loader.Snapshot()
 	if err != nil {
-		return nil, err
+		return err
 	}
 
-	c := &config{
-		exit: make(chan bool),
-		opts: options,
-		snap: snap,
-		vals: vals,
+	c.vals, err = c.opts.Reader.Values(c.snap.ChangeSet)
+	if err != nil {
+		return err
 	}
 
-	go c.run()
-
-	return c, nil
+	return nil
 }
 
 func (c *config) run() {

config/source/service/service.go

@@ -13,7 +13,6 @@ var (
 	DefaultName      = "go.micro.config"
 	DefaultNamespace = "global"
 	DefaultPath      = ""
-	DefaultClient    = client.DefaultClient
 )
 
 type service struct {
@@ -25,7 +24,8 @@ type service struct {
 }
 
 func (m *service) Read() (set *source.ChangeSet, err error) {
-	req, err := m.client.Read(context.Background(), &proto.ReadRequest{
+	client := proto.NewConfigService(m.serviceName, client.DefaultClient)
+	req, err := client.Read(context.Background(), &proto.ReadRequest{
 		Namespace: m.namespace,
 		Path:      m.path,
 	})
@@ -37,7 +37,8 @@ func (m *service) Read() (set *source.ChangeSet, err error) {
 }
 
 func (m *service) Watch() (w source.Watcher, err error) {
-	stream, err := m.client.Watch(context.Background(), &proto.WatchRequest{
+	client := proto.NewConfigService(m.serviceName, client.DefaultClient)
+	stream, err := client.Watch(context.Background(), &proto.WatchRequest{
 		Namespace: m.namespace,
 		Path:      m.path,
 	})
@@ -91,7 +92,6 @@ func NewSource(opts ...source.Option) source.Source {
 		opts:        options,
 		namespace:   namespace,
 		path:        path,
-		client:      proto.NewConfigService(addr, DefaultClient),
 	}
 
 	return s

options.go

@@ -9,6 +9,7 @@ import (
 	"github.com/micro/go-micro/v2/broker"
 	"github.com/micro/go-micro/v2/client"
 	"github.com/micro/go-micro/v2/client/selector"
+	"github.com/micro/go-micro/v2/config"
 	"github.com/micro/go-micro/v2/config/cmd"
 	"github.com/micro/go-micro/v2/debug/profile"
 	"github.com/micro/go-micro/v2/debug/trace"
@@ -27,6 +28,7 @@ type Options struct {
 	Registry  registry.Registry
 	Transport transport.Transport
 	Profile   profile.Profile
+	Config    config.Config
 
 	// Before and After funcs
 	BeforeStart []func() error
@@ -46,6 +48,7 @@ func newOptions(opts ...Option) Options {
 		Auth:      auth.DefaultAuth,
 		Broker:    broker.DefaultBroker,
 		Cmd:       cmd.DefaultCmd,
+		Config:    config.DefaultConfig,
 		Client:    client.DefaultClient,
 		Server:    server.DefaultServer,
 		Registry:  registry.DefaultRegistry,
@@ -143,6 +146,13 @@ func Auth(a auth.Auth) Option {
 	}
 }
 
+// Config sets the config for the service
+func Config(c config.Config) Option {
+	return func(o *Options) {
+		o.Config = c
+	}
+}
+
 // Selector sets the selector for the service client
 func Selector(s selector.Selector) Option {
 	return func(o *Options) {