chore(functions/v2/tips/retry): create new cloud event sample from background sample

Author: Kenneth Rosario Acevedo

functions/v2/tips/retry/index.js

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+// Copyright 2023 Google LLC
+//
+// 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.
+
+// [START functions_cloudevent_tips_retry]
+const functions = require('@google-cloud/functions-framework');
+
+/**
+ * Register a Cloud Event Function that demonstrates
+ * how to toggle retries using a promise
+ *
+ * @param {object} event The Cloud Event for the function trigger.
+ */
+functions.cloudEvent('retryPromise', cloudEvent => {
+  // The Pub/Sub event payload is passed as the CloudEvent's data payload.
+  // See the documentation for more details:
+  // https://cloud.google.com/eventarc/docs/cloudevents#pubsub
+  const base64PubsubMessage = cloudEvent.data.message.data;
+  const jsonString = Buffer.from(base64PubsubMessage, 'base64').toString();
+
+  const tryAgain = JSON.parse(jsonString).retry;
+
+  if (tryAgain) {
+    throw new Error('Retrying...');
+  } else {
+    console.error('Not retrying...');
+    return Promise.resolve();
+  }
+});
+
+/**
+ * Cloud Event Function that demonstrates
+ * how to toggle retries using a callback
+ *
+ * @param {object} event The Cloud Event for the function trigger.
+ * @param {function} callback The callback function.
+ */
+functions.cloudEvent('retryCallback', (cloudEvent, callback) => {
+  // The Pub/Sub event payload is passed as the CloudEvent's data payload.
+  // See the documentation for more details:
+  // https://cloud.google.com/eventarc/docs/cloudevents#pubsub
+  const base64PubsubMessage = cloudEvent.data.message.data;
+  const jsonString = Buffer.from(base64PubsubMessage, 'base64').toString();
+
+  const tryAgain = JSON.parse(jsonString).retry;
+  const err = new Error('Error!');
+
+  if (tryAgain) {
+    console.error('Retrying:', err);
+    callback(err);
+  } else {
+    console.error('Not retrying:', err);
+    callback();
+  }
+});
+// [END functions_cloudevent_tips_retry]

functions/v2/tips/retry/package.json

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+{
+  "name": "nodejs-docs-samples-functions-tips-retry",
+  "version": "0.0.1",
+  "private": true,
+  "license": "Apache-2.0",
+  "author": "Google Inc.",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/GoogleCloudPlatform/nodejs-docs-samples.git"
+  },
+  "engines": {
+    "node": ">=12.0.0"
+  },
+  "scripts": {
+    "test": "mocha test/*.test.js --timeout=60000 --exit"
+  },
+  "devDependencies": {
+    "mocha": "^9.0.0",
+    "sinon": "^15.0.0",
+    "supertest": "^6.3.3"
+  },
+  "dependencies": {
+    "@google-cloud/functions-framework": "^3.1.3"
+  }
+}

functions/v2/tips/retry/test/integration.test.js

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+// Copyright 2023 Google LLC
+//
+// 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.
+
+const supertest = require('supertest');
+const functionsFramework = require('@google-cloud/functions-framework/testing');
+
+require('..');
+
+const jsonRetryObject = JSON.stringify({retry: true});
+const encodedRetryMessage = Buffer.from(jsonRetryObject).toString('base64');
+
+const jsonDontRetryObject = JSON.stringify({retry: false});
+const encodedDontRetryMessage =
+  Buffer.from(jsonDontRetryObject).toString('base64');
+
+describe('functions_cloudevent_tips_retry', () => {
+  it('should raise error to retry', async () => {
+    const cloudEventData = {data: {message: {}}};
+    cloudEventData.data.message.data = encodedRetryMessage;
+
+    const promiseServer = functionsFramework.getTestServer('retryPromise');
+    await supertest(promiseServer)
+      .post('/')
+      .send(cloudEventData)
+      .set('Content-Type', 'application/json')
+      .expect(500);
+
+    const callBackServer = functionsFramework.getTestServer('retryCallback');
+    await supertest(callBackServer)
+      .post('/')
+      .send(cloudEventData)
+      .set('Content-Type', 'application/json')
+      .expect(500);
+  });
+
+  it('should not raise error to not retry', async () => {
+    const cloudEventData = {data: {message: {}}};
+    cloudEventData.data.message.data = encodedDontRetryMessage;
+
+    const promiseServer = functionsFramework.getTestServer('retryPromise');
+    await supertest(promiseServer)
+      .post('/')
+      .send(cloudEventData)
+      .set('Content-Type', 'application/json')
+      .expect(204);
+
+    const callBackServer = functionsFramework.getTestServer('retryCallback');
+    await supertest(callBackServer)
+      .post('/')
+      .send(cloudEventData)
+      .set('Content-Type', 'application/json')
+      .expect(204);
+  });
+});

functions/v2/tips/retry/test/unit.test.js

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+// Copyright 2023 Google LLC
+//
+// 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.
+
+'use strict';
+
+const {getFunction} = require('@google-cloud/functions-framework/testing');
+const sinon = require('sinon');
+const assert = require('assert');
+require('..');
+
+const jsonRetryObject = JSON.stringify({retry: true});
+const encodedRetryMessage = Buffer.from(jsonRetryObject).toString('base64');
+
+const jsonDontRetryObject = JSON.stringify({retry: false});
+const encodedDontRetryMessage =
+  Buffer.from(jsonDontRetryObject).toString('base64');
+
+describe('functions_cloudevent_tips_retry', () => {
+  it('should demonstrate retry behavior for a promise', async () => {
+    const retryPromise = getFunction('retryPromise');
+
+    // Retry by throwing an error
+    assert.throws(() => {
+      retryPromise({
+        data: {
+          message: {
+            data: encodedRetryMessage,
+          },
+        },
+      });
+    }, new Error('Retrying...'));
+
+    // Terminate by returning a rejected promise
+    try {
+      await retryPromise({data: {message: {data: encodedDontRetryMessage}}});
+    } catch (err) {
+      assert.strictEqual(err.message, 'Not retrying...');
+      return Promise.resolve();
+    }
+  });
+
+  it('should demonstrate retry behavior for a callback', done => {
+    const retryCallback = getFunction('retryCallback');
+    const cb = sinon.stub();
+    const err = new Error('Error!');
+
+    // Retry by passing an error to the callback
+    retryCallback(
+      {
+        data: {
+          message: {
+            data: encodedRetryMessage,
+          },
+        },
+      },
+      cb
+    );
+    assert.deepStrictEqual(cb.firstCall.args, [err]);
+
+    // Terminate by passing nothing to the callback
+    retryCallback({data: {message: {data: encodedDontRetryMessage}}}, cb);
+    assert.deepStrictEqual(cb.secondCall.args, []);
+    done();
+  });
+});