Event changes (#30)

dev/restate/events.proto

@@ -12,41 +12,16 @@ syntax = "proto3";
 package dev.restate;
 
 import "dev/restate/ext.proto";
-import "google/protobuf/empty.proto";
-import "google/protobuf/struct.proto";
 
 option java_multiple_files = true;
 option java_package = "dev.restate.generated";
 option go_package = "restate.dev/sdk-go/pb";
 
 message Event {
-  // Payload
-  bytes payload = 2;
-
-  // Metadata
-  string source = 3;
-
-  // This is filled by the source to retain ordering guarantees, depending on the source type
   bytes ordering_key = 1 [(dev.restate.ext.field) = KEY];
-  map<string, string> attributes = 15;
-}
-
-message KeyedEvent {
-  // Payload
-  bytes key = 1 [(dev.restate.ext.field) = KEY];
-  bytes payload = 2;
-
-  // Metadata
-  string source = 3;
-  map<string, string> attributes = 15;
-}
 
-message StringKeyedEvent {
-  // Payload
-  string key = 1 [(dev.restate.ext.field) = KEY];
-  bytes payload = 2;
+  bytes key = 2;
+  bytes payload = 3;
 
-  // Metadata
-  string source = 3;
   map<string, string> attributes = 15;
 }

dev/restate/ext.proto

@@ -30,6 +30,13 @@ enum ServiceType {
 enum FieldType {
   // protolint:disable:next ENUM_FIELD_NAMES_ZERO_VALUE_END_WITH
   KEY = 0;
+
+  // Flag a field as event payload. When receiving events, this field will be filled with the event payload.
+  // Note: only types string and bytes can be used for event payload fields
+  EVENT_PAYLOAD = 1;
+  // Flag a field as event metadata. When receiving events, this field will be filled with the event metadata.
+  // Note: only type map<string, string> can be used for event payload fields
+  EVENT_METADATA = 2;
 }
 
 extend google.protobuf.ServiceOptions {