adjust API

weed/pb/messaging.proto

@@ -46,6 +46,12 @@ message SubscriberMessage {
     AckMessage ack = 2;
 }
 
+message RawData {
+    bytes key = 1; // Message key
+    bytes value = 2; // Message payload
+    map<string, bytes> headers = 3; // Message headers
+}
+
 message Message {
     int64 timestamp = 1 [jstype = JS_STRING]; // When the message was received by the broker
     bytes key = 2; // Message key
@@ -68,12 +74,12 @@ message PublishRequest {
         int32 partition = 3;
     }
     InitMessage init = 1;
-    message DataMessage {
+    message RawData {
         bytes key = 1; // Message key
         bytes value = 2; // Message payload
         map<string, bytes> headers = 3; // Message headers
     }
-    DataMessage data = 2;
+    RawData data = 2;
 }
 
 message PublishResponse {