blob: 91367c2a5e9cfccd4fb2af15cccbf429f58240c6 [file] [log] [blame]
// Copyright 2019 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:convert';
import 'package:googleapis/pubsub/v1.dart' as pubsub;
import 'package:googleapis_auth/auth_io.dart';
import 'package:http/http.dart';
import '../foundation/providers.dart';
import '../foundation/typedefs.dart';
import '../service/log.dart';
/// Service class for interacting with PubSub.
class PubSub {
const PubSub({
this.httpClientProvider = Providers.freshHttpClient,
});
final HttpClientProvider httpClientProvider;
/// Adds one message to the topic.
Future<void> publish(String topic, dynamic json) async {
final Client httpClient = await clientViaApplicationDefaultCredentials(
scopes: <String>[
pubsub.PubsubApi.pubsubScope,
],
);
final pubsub.PubsubApi pubsubApi = pubsub.PubsubApi(httpClient);
final String messageData = jsonEncode(json);
final List<int> messageBytes = utf8.encode(messageData);
final String messageBase64 = base64Encode(messageBytes);
final pubsub.PublishRequest request = pubsub.PublishRequest(
messages: <pubsub.PubsubMessage>[
pubsub.PubsubMessage(data: messageBase64),
],
);
final String fullTopicName = 'projects/flutter-dashboard/topics/$topic';
final pubsub.PublishResponse response = await pubsubApi.projects.topics.publish(request, fullTopicName);
log.info('pubsub response messageId=${response.messageIds}');
}
/// Pulls messages from the server.
Future<pubsub.PullResponse> pull(String subscription, int maxMessages) async {
final Client httpClient = await clientViaApplicationDefaultCredentials(
scopes: <String>[
pubsub.PubsubApi.pubsubScope,
],
);
final pubsub.PubsubApi pubsubApi = pubsub.PubsubApi(httpClient);
final pubsub.PullRequest pullRequest = pubsub.PullRequest(maxMessages: maxMessages);
final pubsub.PullResponse pullResponse = await pubsubApi.projects.subscriptions
.pull(pullRequest, 'projects/flutter-dashboard/subscriptions/$subscription');
return pullResponse;
}
/// Acknowledges the messages associated with the `ack_ids` in the `AcknowledgeRequest`.
///
/// The PubSub system can remove the relevant messages from the subscription.
Future<void> acknowledge(String subscription, String ackId) async {
final Client httpClient = await clientViaApplicationDefaultCredentials(
scopes: <String>[
pubsub.PubsubApi.pubsubScope,
],
);
final pubsub.PubsubApi pubsubApi = pubsub.PubsubApi(httpClient);
final List<String> ackIds = [ackId];
final pubsub.AcknowledgeRequest acknowledgeRequest = pubsub.AcknowledgeRequest(ackIds: ackIds);
await pubsubApi.projects.subscriptions
.acknowledge(acknowledgeRequest, 'projects/flutter-dashboard/subscriptions/$subscription');
}
}