feat(observability): trace BatchTransaction and Table

This change is part of a series of changes to add
OpenTelemetry traces, focused on BatchTransaction and Table.

While here, made the tests for sessionPool spans much more
precise to avoid flakes.

Updates #2079
Built from PR #2087
Updates #2114

observability-test/batch-transaction.ts

@@ -0,0 +1,255 @@
+/*!
+ * Copyright 2024 Google LLC. All Rights Reserved.
+ *
+ * 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.
+ */
+
+/* eslint-disable prefer-rest-params */
+
+import {util} from '@google-cloud/common';
+import * as pfy from '@google-cloud/promisify';
+import * as assert from 'assert';
+import {before, beforeEach, afterEach, describe, it} from 'mocha';
+import * as extend from 'extend';
+import * as proxyquire from 'proxyquire';
+import * as sinon from 'sinon';
+const {
+  AlwaysOnSampler,
+  NodeTracerProvider,
+  InMemorySpanExporter,
+} = require('@opentelemetry/sdk-trace-node');
+// eslint-disable-next-line n/no-extraneous-require
+const {SimpleSpanProcessor} = require('@opentelemetry/sdk-trace-base');
+import {Session, Spanner} from '../src';
+import * as bt from '../src/batch-transaction';
+
+const fakePfy = extend({}, pfy, {
+  promisifyAll(klass, options) {
+    if (klass.name !== 'BatchTransaction') {
+      return;
+    }
+    assert.deepStrictEqual(options.exclude, ['identifier']);
+  },
+});
+
+class FakeTimestamp {
+  calledWith_: IArguments;
+  constructor() {
+    this.calledWith_ = arguments;
+  }
+}
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+const fakeCodec: any = {
+  encode: util.noop,
+  Timestamp: FakeTimestamp,
+  Int() {},
+  Float() {},
+  SpannerDate() {},
+  convertProtoTimestampToDate() {},
+};
+
+const SPANNER = {
+  routeToLeaderEnabled: true,
+};
+
+const INSTANCE = {
+  parent: SPANNER,
+};
+
+const DATABASE = {
+  formattedName_: 'database',
+  parent: INSTANCE,
+};
+
+class FakeTransaction {
+  calledWith_: IArguments;
+  session;
+  constructor(session) {
+    this.calledWith_ = arguments;
+    this.session = session;
+  }
+  static encodeKeySet(): object {
+    return {};
+  }
+  static encodeParams(): object {
+    return {};
+  }
+
+  _getSpanner(): Spanner {
+    return SPANNER as Spanner;
+  }
+
+  run() {}
+  read() {}
+}
+
+describe('BatchTransaction', () => {
+  const sandbox = sinon.createSandbox();
+
+  // tslint:disable-next-line variable-name
+  let BatchTransaction: typeof bt.BatchTransaction;
+  let batchTransaction: bt.BatchTransaction;
+
+  before(() => {
+    BatchTransaction = proxyquire('../src/batch-transaction.js', {
+      '@google-cloud/precise-date': {PreciseDate: FakeTimestamp},
+      '@google-cloud/promisify': fakePfy,
+      './codec.js': {codec: fakeCodec},
+      './transaction.js': {Snapshot: FakeTransaction},
+    }).BatchTransaction;
+  });
+
+  const traceExporter = new InMemorySpanExporter();
+  const sampler = new AlwaysOnSampler();
+
+  const provider = new NodeTracerProvider({
+    sampler: sampler,
+    exporter: traceExporter,
+  });
+  provider.addSpanProcessor(new SimpleSpanProcessor(traceExporter));
+
+  afterEach(() => {
+    traceExporter.reset();
+    sandbox.restore();
+  });
+
+  const REQUEST = sandbox.stub();
+  const SESSION = {
+    parent: DATABASE,
+    formattedName_: 'abcdef',
+    request: REQUEST,
+  };
+  const ID = '0xdeadbeef';
+
+  const PARTITIONS = [{partitionToken: 'a'}, {partitionToken: 'b'}];
+  const RESPONSE = {partitions: PARTITIONS};
+
+  beforeEach(() => {
+    batchTransaction = new BatchTransaction(SESSION as {} as Session);
+    batchTransaction.session = SESSION as {} as Session;
+    batchTransaction.id = ID;
+    batchTransaction.observabilityOptions = {tracerProvider: provider};
+    REQUEST.callsFake((_, callback) => callback(null, RESPONSE));
+  });
+
+  const GAX_OPTS = {};
+
+  const QUERY = {
+    sql: 'SELECT * FROM Singers',
+    gaxOptions: GAX_OPTS,
+    params: {},
+    types: {},
+  };
+
+  it('createQueryPartitions', done => {
+    const REQUEST = sandbox.stub();
+
+    const res = batchTransaction.createQueryPartitions(
+      QUERY,
+      (err, part, resp) => {
+        assert.ifError(err);
+        traceExporter.forceFlush();
+        const spans = traceExporter.getFinishedSpans();
+        assert.strictEqual(spans.length, 2, 'Exactly 2 spans expected');
+
+        // Sort the spans by duration.
+        spans.sort((spanA, spanB) => {
+          spanA.duration < spanB.duration;
+        });
+
+        const actualSpanNames: string[] = [];
+        spans.forEach(span => {
+          actualSpanNames.push(span.name);
+        });
+
+        const expectedSpanNames = [
+          'CloudSpanner.BatchTransaction.createPartitions_',
+          'CloudSpanner.BatchTransaction.createQueryPartitions',
+        ];
+        assert.deepStrictEqual(
+          actualSpanNames,
+          expectedSpanNames,
+          `span names mismatch:\n\tGot:  ${actualSpanNames}\n\tWant: ${expectedSpanNames}`
+        );
+
+        // Ensure that createPartitions_ is a child span of createQueryPartitions.
+        const spanCreatePartitions_ = spans[0];
+        const spanCreateQueryPartitions = spans[1];
+        assert.ok(
+          spanCreateQueryPartitions.spanContext().traceId,
+          'Expected that createQueryPartitions has a defined traceId'
+        );
+        assert.ok(
+          spanCreatePartitions_.spanContext().traceId,
+          'Expected that createPartitions_ has a defined traceId'
+        );
+        assert.deepStrictEqual(
+          spanCreatePartitions_.spanContext().traceId,
+          spanCreateQueryPartitions.spanContext().traceId,
+          'Expected that both spans share a traceId'
+        );
+        assert.ok(
+          spanCreateQueryPartitions.spanContext().spanId,
+          'Expected that createQueryPartitions has a defined spanId'
+        );
+        assert.ok(
+          spanCreatePartitions_.spanContext().spanId,
+          'Expected that createPartitions_ has a defined spanId'
+        );
+        assert.deepStrictEqual(
+          spanCreatePartitions_.parentSpanId,
+          spanCreateQueryPartitions.spanContext().spanId,
+          'Expected that createQueryPartitions is the parent to createPartitions_'
+        );
+        done();
+      }
+    );
+  });
+
+  it('createReadPartitions', done => {
+    const REQUEST = sandbox.stub();
+    const response = {};
+    REQUEST.callsFake((_, callback) => callback(null, response));
+
+    const res = batchTransaction.createReadPartitions(
+      QUERY,
+      (err, part, resp) => {
+        assert.ifError(err);
+        traceExporter.forceFlush();
+        const spans = traceExporter.getFinishedSpans();
+        assert.strictEqual(spans.length, 2, 'Exactly 2 spans expected');
+
+        // Sort the spans by duration.
+        spans.sort((spanA, spanB) => {
+          spanA.duration < spanB.duration;
+        });
+
+        const actualSpanNames: string[] = [];
+        spans.forEach(span => {
+          actualSpanNames.push(span.name);
+        });
+        const expectedSpanNames = [
+          'CloudSpanner.BatchTransaction.createPartitions_',
+          'CloudSpanner.BatchTransaction.createReadPartitions',
+        ];
+        assert.deepStrictEqual(
+          actualSpanNames,
+          expectedSpanNames,
+          `span names mismatch:\n\tGot:  ${actualSpanNames}\n\tWant: ${expectedSpanNames}`
+        );
+        done();
+      }
+    );
+  });
+});