snapshot of https://github.com/ThreeDotsLabs/watermill.git (master, 2026-09-15; blobs > 131072B omitted)

components/cqrs/marshaler_json.go

@@ -0,0 +1,53 @@
+package cqrs
+
+import (
+	"encoding/json"
+
+	"github.com/ThreeDotsLabs/watermill"
+	"github.com/ThreeDotsLabs/watermill/message"
+)
+
+type JSONMarshaler struct {
+	NewUUID      func() string
+	GenerateName func(v interface{}) string
+}
+
+func (m JSONMarshaler) Marshal(v interface{}) (*message.Message, error) {
+	b, err := json.Marshal(v)
+	if err != nil {
+		return nil, err
+	}
+
+	msg := message.NewMessage(
+		m.newUUID(),
+		b,
+	)
+	msg.Metadata.Set("name", m.Name(v))
+
+	return msg, nil
+}
+
+func (m JSONMarshaler) newUUID() string {
+	if m.NewUUID != nil {
+		return m.NewUUID()
+	}
+
+	// default
+	return watermill.NewUUID()
+}
+
+func (JSONMarshaler) Unmarshal(msg *message.Message, v interface{}) (err error) {
+	return json.Unmarshal(msg.Payload, v)
+}
+
+func (m JSONMarshaler) Name(cmdOrEvent interface{}) string {
+	if m.GenerateName != nil {
+		return m.GenerateName(cmdOrEvent)
+	}
+
+	return FullyQualifiedStructName(cmdOrEvent)
+}
+
+func (m JSONMarshaler) NameFromMessage(msg *message.Message) string {
+	return msg.Metadata.Get("name")
+}