allows for publishing extra attributes in google pubsub

.changeset/poor-onions-decide.md

@@ -0,0 +1,6 @@
+---
+"graphql-eventbus": minor
+"graphql-eventbus-google-pubsub": minor
+---
+
+allows for publishing extra attributes in google pubsub

packages/core/src/GraphQLEventbus.test.ts

@@ -122,6 +122,43 @@ test("Publishing fails if bus is not initialized", async () => {
   ).rejects.toThrow();
 });
 
+test("extra payload is passed to the publish cb", async () => {
+  const publishCb = jest.fn();
+  const bus = new GraphQLEventbus({
+    publisher: {
+      schema: pubSchema,
+      publish: async (d) => {
+        publishCb(d);
+      },
+      allowInvalidTopic: true,
+    },
+  });
+  await bus.init();
+  await bus.publish({
+    topic: "TestEvent",
+    payload: {
+      id: "123",
+      name: "name",
+    },
+    extra: {
+      a: 1,
+    },
+  });
+  expect(publishCb).toBeCalledTimes(1);
+  expect(publishCb.mock.calls[0][0]).toMatchObject({
+    baggage: {
+      payload: {
+        id: "123",
+        name: "name",
+      },
+    },
+    topic: "TestEvent",
+    extra: {
+      a: 1,
+    },
+  });
+});
+
 test("valid events are consumed and hooks are called", async () => {
   const consumeCb = jest.fn();
   let cbRef!: DataCb;

packages/core/src/GraphQLEventbus.ts

@@ -92,6 +92,7 @@ export class GraphQLEventbus {
         publish: (args: {
           topic: string;
           baggage: Baggage;
+          extra?: Record<string, unknown>;
         }) => Promise<unknown>;
         allowInvalidTopic?: boolean;
       };
@@ -246,6 +247,7 @@ export class GraphQLEventbus {
     topic: string;
     payload: {};
     metadata?: Partial<GraphQLEventbusMetadata>;
+    extra?: Record<string, unknown>;
   }) => {
     if (!this.isInitialized) {
       throw new Error("The eventbus must be initialized before publishing.");
@@ -294,6 +296,7 @@ export class GraphQLEventbus {
           metadata,
           payload: props.payload,
         },
+        extra: props.extra,
       });
       if (publishSuccessHooks.length) {
         await Promise.all(

packages/google-pubsub/src/PubSubEventBus.ts

@@ -57,6 +57,7 @@ export class PubSubEventBus {
             publish: async (a) => {
               await this.publishTopics[a.topic].publishMessage({
                 data: Buffer.from(JSON.stringify(a.baggage)),
+                ...a.extra,
               });
             },
           }
@@ -153,11 +154,20 @@ export class PubSubEventBus {
     topic: string;
     payload: Record<string, unknown>;
     metadata?: Partial<GraphQLEventbusMetadata>;
+    attributes?:
+      | {
+          [k: string]: string;
+        }
+      | null
+      | undefined;
   }) => {
     await this.bus.publish({
       payload: a.payload,
       topic: a.topic,
       metadata: a.metadata,
+      extra: {
+        atttibutes: a.attributes,
+      },
     });
   };
 }