Creating Stream Tests for the Web Client

Author: schmidt-sebastian

packages/firestore/test/integration/remote/stream.test.ts

@@ -0,0 +1,231 @@
+/**
+ * Copyright 2017 Google Inc.
+ *
+ * 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 { expect } from 'chai';
+import { EmptyCredentialsProvider } from '../../../src/api/credentials';
+import { SnapshotVersion } from '../../../src/core/snapshot_version';
+import { MutationResult } from '../../../src/model/mutation';
+import { PlatformSupport } from '../../../src/platform/platform';
+import { Datastore } from '../../../src/remote/datastore';
+import {
+  PersistentListenStream,
+  PersistentWriteStream,
+  WatchStreamListener,
+  WriteStreamListener
+} from '../../../src/remote/persistent_stream';
+import {
+  DocumentWatchChange,
+  ExistenceFilterChange,
+  WatchTargetChange
+} from '../../../src/remote/watch_change';
+import { AsyncQueue } from '../../../src/util/async_queue';
+import { Deferred } from '../../../src/util/promise';
+import { asyncIt } from '../../util/helpers';
+import { getDefaultDatabaseInfo } from '../util/helpers';
+import FirestoreError = firestore.FirestoreError;
+
+type StreamStatusCallback =
+  | 'onHandshakeComplete'
+  | 'onMutationResult'
+  | 'onWatchChange'
+  | 'onOpen'
+  | 'onClose';
+
+class StreamStatusListener implements WatchStreamListener, WriteStreamListener {
+  private pendingStates: StreamStatusCallback[] = [];
+  private pendingPromises: Deferred<StreamStatusCallback>[] = [];
+
+  private resolvePending(actualCallback: StreamStatusCallback) {
+    let pendingPromise = this.pendingPromises.shift();
+    if (pendingPromise) {
+      pendingPromise.resolve(actualCallback);
+    } else {
+      this.pendingStates.push(actualCallback);
+    }
+    return Promise.resolve();
+  }
+
+  onHandshakeComplete(): Promise<void> {
+    return this.resolvePending('onHandshakeComplete');
+  }
+
+  onMutationResult(
+    commitVersion: SnapshotVersion,
+    results: MutationResult[]
+  ): Promise<void> {
+    return this.resolvePending('onMutationResult');
+  }
+
+  onWatchChange(
+    watchChange:
+      | DocumentWatchChange
+      | WatchTargetChange
+      | ExistenceFilterChange,
+    snapshot: SnapshotVersion
+  ): Promise<void> {
+    return this.resolvePending('onWatchChange');
+  }
+
+  onOpen(): Promise<void> {
+    return this.resolvePending('onOpen');
+  }
+
+  onClose(err?: FirestoreError): Promise<void> {
+    return this.resolvePending('onClose');
+  }
+
+  /**
+   * Returns a Promise that resolves when the 'expectedCallback' fires.
+   * Resolves the returned Promise immediately if there is already an
+   * unprocessed callback.
+   * Fails the test if the expected callback does not match the name of the
+   * actual callback function.
+   */
+  awaitCallback(expectedCallback: StreamStatusCallback): Promise<void> {
+    if (this.pendingStates.length > 0) {
+      expect(this.pendingStates.shift()).to.eq(expectedCallback);
+      return Promise.resolve();
+    } else {
+      const deferred = new Deferred<StreamStatusCallback>();
+      this.pendingPromises.push(deferred);
+      return deferred.promise.then(actualCallback => {
+        expect(actualCallback).to.equal(expectedCallback);
+      });
+    }
+  }
+
+  verifyNoPendingCallbacks(): void {
+    expect(this.pendingStates).to.be.empty;
+  }
+}
+
+describe('Watch Stream', () => {
+  let queue: AsyncQueue;
+  let streamListener: StreamStatusListener;
+
+  beforeEach(() => {
+    queue = new AsyncQueue();
+    streamListener = new StreamStatusListener();
+  });
+
+  afterEach(() => {
+    streamListener.verifyNoPendingCallbacks();
+  });
+
+  function initializeWatchStream(): Promise<PersistentListenStream> {
+    const databaseInfo = getDefaultDatabaseInfo();
+
+    return PlatformSupport.getPlatform()
+      .loadConnection(databaseInfo)
+      .then(conn => {
+        const serializer = PlatformSupport.getPlatform().newSerializer(
+          databaseInfo.databaseId
+        );
+        return new Datastore(
+          databaseInfo,
+          queue,
+          conn,
+          new EmptyCredentialsProvider(),
+          serializer
+        );
+      })
+      .then(ds => {
+        return ds.newPersistentWatchStream(streamListener);
+      });
+  }
+
+  asyncIt('can be stopped before handshake', () => {
+    let watchStream: PersistentListenStream;
+
+    return initializeWatchStream()
+      .then(ws => {
+        watchStream = ws;
+        watchStream.start();
+        return streamListener.awaitCallback('onOpen');
+      })
+      .then(() => {
+        watchStream.stop();
+      });
+  });
+});
+
+describe('Write Stream', () => {
+  let queue: AsyncQueue;
+  let streamListener: StreamStatusListener;
+
+  beforeEach(() => {
+    queue = new AsyncQueue();
+    streamListener = new StreamStatusListener();
+  });
+
+  afterEach(() => {
+    streamListener.verifyNoPendingCallbacks();
+  });
+
+  function initializeWriteStream(): Promise<PersistentWriteStream> {
+    const databaseInfo = getDefaultDatabaseInfo();
+
+    return PlatformSupport.getPlatform()
+      .loadConnection(databaseInfo)
+      .then(conn => {
+        const serializer = PlatformSupport.getPlatform().newSerializer(
+          databaseInfo.databaseId
+        );
+        return new Datastore(
+          databaseInfo,
+          queue,
+          conn,
+          new EmptyCredentialsProvider(),
+          serializer
+        );
+      })
+      .then(ds => {
+        return ds.newPersistentWriteStream(streamListener);
+      });
+  }
+
+  asyncIt('can be stopped before handshake', () => {
+    let writeStream: PersistentWriteStream;
+
+    return initializeWriteStream()
+      .then(ws => {
+        writeStream = ws;
+        writeStream.start();
+        return streamListener.awaitCallback('onOpen');
+      })
+      .then(() => {
+        writeStream.stop();
+      });
+  });
+
+  asyncIt('can be stopped after handshake', () => {
+    let writeStream: PersistentWriteStream;
+
+    return initializeWriteStream()
+      .then(ws => {
+        writeStream = ws;
+        writeStream.start();
+        return streamListener.awaitCallback('onOpen');
+      })
+      .then(() => {
+        writeStream.writeHandshake();
+        return streamListener.awaitCallback('onHandshakeComplete');
+      })
+      .then(() => {
+        writeStream.stop();
+      });
+  });
+});