simplified nats Option injection via Context

nats.go

@@ -170,38 +170,39 @@ func (n *nbroker) String() string {
 
 func NewBroker(opts ...broker.Option) broker.Broker {
 
-	bopts := &brokerOptions{
-		natsOptions: DefaultNatsOptions,
-	}
-
 	options := broker.Options{
 		// Default codec
 		Codec:   json.NewCodec(),
-		Context: context.WithValue(context.Background(), optionsKey, bopts),
+		Context: context.Background(),
 	}
 
 	for _, o := range opts {
 		o(&options)
 	}
 
+	natsOptions := nats.GetDefaultOptions()
+	if n, ok := options.Context.Value(optionsKey{}).(nats.Options); ok {
+		natsOptions = n
+	}
+
 	// broker.Options have higher priority than nats.Options
 	// only if Addrs, Secure or TLSConfig were not set through a broker.Option
 	// we read them from nats.Option
 	if len(options.Addrs) == 0 {
-		options.Addrs = bopts.natsOptions.Servers
+		options.Addrs = natsOptions.Servers
 	}
 
 	if !options.Secure {
-		options.Secure = bopts.natsOptions.Secure
+		options.Secure = natsOptions.Secure
 	}
 
 	if options.TLSConfig == nil {
-		options.TLSConfig = bopts.natsOptions.TLSConfig
+		options.TLSConfig = natsOptions.TLSConfig
 	}
 
 	nb := &nbroker{
 		opts:  options,
-		nopts: bopts.natsOptions,
+		nopts: natsOptions,
 		addrs: setAddrs(options.Addrs),
 	}
 

nats_test.go

@@ -67,7 +67,7 @@ func TestInitAddrs(t *testing.T) {
 			case "natsOptionConstructor":
 				nopts := nats.GetDefaultOptions()
 				nopts.Servers = addrs
-				br = NewBroker(NatsOptions(nopts))
+				br = NewBroker(Options(nopts))
 				br.Init()
 			case "default":
 				br = NewBroker()

options.go

@@ -1,27 +1,21 @@
 package nats
 
 import (
+	"context"
+
 	"github.com/micro/go-micro/broker"
 	"github.com/nats-io/nats"
 )
 
-var (
+type optionsKey struct{}
-	DefaultNatsOptions = nats.GetDefaultOptions()
 
-	optionsKey = optionsKeyType{}
+// Options allow to inject a nats.Options struct for configuring
-)
-
-type optionsKeyType struct{}
-
-type brokerOptions struct {
-	natsOptions nats.Options
-}
-
-// NatsOptions allow to inject a nats.Options struct for configuring
 // the nats connection
-func NatsOptions(nopts nats.Options) broker.Option {
+func Options(nopts nats.Options) broker.Option {
 	return func(o *broker.Options) {
-		no := o.Context.Value(optionsKey).(*brokerOptions)
+		if o.Context == nil {
-		no.natsOptions = nopts
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, optionsKey{}, nopts)
 	}
 }