events-backend: add dev setup

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/events-backend/dev/index.ts

@@ -0,0 +1,75 @@
+/*
+ * Copyright 2024 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { createBackend } from '@backstage/backend-defaults';
+import {
+  coreServices,
+  createBackendPlugin,
+} from '@backstage/backend-plugin-api';
+import { eventsServiceRef } from '@backstage/plugin-events-node';
+
+const backend = createBackend();
+
+backend.add(import('../src/alpha'));
+
+backend.add(
+  createBackendPlugin({
+    pluginId: 'producer',
+    register(reg) {
+      reg.registerInit({
+        deps: {
+          events: eventsServiceRef,
+          logger: coreServices.logger,
+        },
+        async init({ events, logger }) {
+          setInterval(() => {
+            logger.info(`Publishing event to topic 'test'`);
+            events.publish({
+              eventPayload: { foo: 'bar' },
+              topic: 'test',
+              metadata: { meta: 'baz' },
+            });
+          }, 5000);
+        },
+      });
+    },
+  }),
+);
+
+backend.add(
+  createBackendPlugin({
+    pluginId: 'consumer',
+    register(reg) {
+      reg.registerInit({
+        deps: {
+          events: eventsServiceRef,
+          logger: coreServices.logger,
+        },
+        async init({ events, logger }) {
+          events.subscribe({
+            id: 'test-1',
+            topics: ['test'],
+            async onEvent(event) {
+              logger.info(`Received event: ${JSON.stringify(event, null, 2)}`);
+            },
+          });
+        },
+      });
+    },
+  }),
+);
+
+backend.start();

plugins/events-backend/package.json

@@ -61,6 +61,7 @@
     "winston": "^3.2.1"
   },
   "devDependencies": {
+    "@backstage/backend-defaults": "workspace:^",
     "@backstage/backend-test-utils": "workspace:^",
     "@backstage/cli": "workspace:^",
     "@backstage/plugin-events-backend-test-utils": "workspace:^",

yarn.lock

@@ -6138,6 +6138,7 @@ __metadata:
   resolution: "@backstage/plugin-events-backend@workspace:plugins/events-backend"
   dependencies:
     "@backstage/backend-common": ^0.25.0
+    "@backstage/backend-defaults": "workspace:^"
     "@backstage/backend-plugin-api": "workspace:^"
     "@backstage/backend-test-utils": "workspace:^"
     "@backstage/cli": "workspace:^"