GCF: Add Stackdriver trigger sample

functions/log/.gcloudignore

@@ -0,0 +1,16 @@
+# This file specifies files that are *not* uploaded to Google Cloud Platform
+# using gcloud. It follows the same syntax as .gitignore, with the addition of
+# "#!include" directives (which insert the entries of the given .gitignore-style
+# file at that point).
+#
+# For more information, run:
+#   $ gcloud topic gcloudignore
+#
+.gcloudignore
+# If you would like to upload your .git directory, .gitignore file or files
+# from your .gitignore file, remove the corresponding line
+# below:
+.git
+.gitignore
+
+node_modules

functions/log/index.js

@@ -94,5 +94,17 @@ function getMetrics (callback) {
   // [END functions_log_get_metrics]
 }
 
+// [START functions_log_stackdriver]
+exports.processLogEntry = (data, callback) => {
+  const dataBuffer = Buffer.from(data.data.data, 'base64');
+  const logEntry = JSON.parse(dataBuffer.toString('ascii')).protoPayload;
+
+  console.log(`Method: ${logEntry.methodName}`);
+  console.log(`Resource: ${logEntry.resourceName}`);
+  console.log(`Initiator: ${logEntry.authenticationInfo.principalEmail}`);
+  callback();
+};
+// [END functions_log_stackdriver]
+
 exports.getLogEntries = getLogEntries;
 exports.getMetrics = getMetrics;

functions/log/test/index.test.js

@@ -85,3 +85,31 @@ test.serial(`getMetrics: should retrieve metrics`, (t) => {
 
   t.is(callback.callCount, 1);
 });
+
+test(`processLogEntry: should process log entry`, (t) => {
+  const sample = getSample();
+  const callback = sinon.stub();
+
+  const json = JSON.stringify({
+    protoPayload: {
+      methodName: 'method',
+      resourceName: 'resource',
+      authenticationInfo: {
+        principalEmail: 'me@example.com'
+      }
+    }
+  });
+
+  const data = {
+    data: {
+      data: Buffer.from(json, 'ascii')
+    }
+  };
+
+  sample.program.processLogEntry(data, callback);
+
+  t.true(console.log.calledWith(`Method: method`));
+  t.true(console.log.calledWith(`Resource: resource`));
+  t.true(console.log.calledWith(`Initiator: me@example.com`));
+  t.is(callback.callCount, 1);
+});