Add common logging to scaler

.github/workflows/unit_tests.yaml

@@ -42,7 +42,7 @@ jobs:
 
   test-scaler:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-latestls 
 
     defaults:
       run:

src/autoscaler-common/logger.js

@@ -0,0 +1,38 @@
+// 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
+//
+//     https://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.
+
+/**
+ * Create a Bunyan Logger using structured logging to stdout.
+ */
+const bunyan = require('bunyan');
+const {LoggingBunyan} = require('@google-cloud/logging-bunyan');
+
+// Create logging client.
+const loggingBunyan = new LoggingBunyan({
+  redirectToStdout: true,
+  projectId: process.env.PROJECT_ID,
+  logName: 'autoscaler',
+  useMessageField: false,
+});
+
+const logger = bunyan.createLogger({
+  name: 'cloud-spanner-autoscaler',
+  streams: [
+    loggingBunyan.stream('trace'),
+  ],
+});
+
+module.exports = {
+  logger: logger,
+};

src/autoscaler-common/package.json

@@ -0,0 +1,11 @@
+{
+    "name": "autoscaler-common",
+    "description": "Common code for Spanner autoscater",
+    "license": "Apache-2.0",
+    "author": "Google Inc.",
+    "dependencies": {
+      "@google-cloud/logging-bunyan": "^5.0.1",
+      "bunyan": "^1.8.15"
+    }
+  }
+