broker: fix RawMessage marshal

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

broker/broker.go

@@ -3,6 +3,7 @@ package broker
 
 import (
 	"context"
+	"errors"
 
 	"github.com/unistack-org/micro/v3/metadata"
 )
@@ -34,10 +35,31 @@ type Event interface {
 	Error() error
 }
 
+// RawMessage is a raw encoded JSON value.
+// It implements Marshaler and Unmarshaler and can be used to delay decoding or precompute a encoding.
+type RawMessage []byte
+
+// MarshalJSON returns m as the JSON encoding of m.
+func (m *RawMessage) MarshalJSON() ([]byte, error) {
+	if m == nil {
+		return []byte("null"), nil
+	}
+	return *m, nil
+}
+
+// UnmarshalJSON sets *m to a copy of data.
+func (m *RawMessage) UnmarshalJSON(data []byte) error {
+	if m == nil {
+		return errors.New("RawMessage UnmarshalJSON on nil pointer")
+	}
+	*m = append((*m)[0:0], data...)
+	return nil
+}
+
 // Message is used to transfer data
 type Message struct {
 	Header metadata.Metadata // contains message metadata
-	Body   []byte            // contains message body
+	Body   RawMessage        // contains message body
 }
 
 // Subscriber is a convenience return type for the Subscribe method

broker/memory_test.go

@@ -32,7 +32,7 @@ func TestMemoryBroker(t *testing.T) {
 				"foo": "bar",
 				"id":  fmt.Sprintf("%d", i),
 			},
-			Body: []byte(`hello world`),
+			Body: []byte(`"hello world"`),
 		}
 
 		if err := b.Publish(ctx, topic, message); err != nil {

config/config.go

@@ -43,13 +43,13 @@ type Watcher interface {
 }
 
 // Load loads config from config sources
-func Load(ctx context.Context, cs ...Config) error {
+func Load(ctx context.Context, cs []Config, opts ...LoadOption) error {
 	var err error
 	for _, c := range cs {
 		if err = c.Init(); err != nil {
 			return err
 		}
-		if err = c.Load(ctx); err != nil {
+		if err = c.Load(ctx, opts...); err != nil {
 			return err
 		}
 	}

util/fn/fn.go

@@ -0,0 +1,15 @@
+package fn
+
+type Initer interface {
+	Init(opts ...interface{}) error
+}
+
+func Init(ifaces ...Initer) error {
+	var err error
+	for _, iface := range ifaces {
+		if err = iface.Init(); err != nil {
+			return err
+		}
+	}
+	return nil
+}