1 | /*!
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2 | * Copyright 2014 Google Inc. All Rights Reserved.
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | */
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16 | /// <reference types="node" />
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17 | import { EventEmitter } from 'events';
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18 | import { CallOptions } from 'google-gax';
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19 | import { google } from '../protos/protos';
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20 | import { IAM } from './iam';
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21 | import { FlowControlOptions } from './lease-manager';
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22 | import { DetachedCallback, DetachedResponse, EmptyCallback, EmptyResponse, ExistsCallback, ExistsResponse, Omit, PubSub, RequestCallback, ResourceCallback } from './pubsub';
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23 | import { CreateSnapshotCallback, CreateSnapshotResponse, SeekCallback, SeekResponse, Snapshot } from './snapshot';
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24 | import { SubscriberOptions } from './subscriber';
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25 | import { Topic } from './topic';
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26 | export declare type PushConfig = google.pubsub.v1.IPushConfig;
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27 | export declare type OidcToken = google.pubsub.v1.PushConfig.IOidcToken;
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28 | export declare type SubscriptionMetadata = {
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29 | messageRetentionDuration?: google.protobuf.IDuration | number;
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30 | pushEndpoint?: string;
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31 | oidcToken?: OidcToken;
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32 | } & Omit<google.pubsub.v1.ISubscription, 'messageRetentionDuration'>;
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33 | export declare type SubscriptionOptions = SubscriberOptions & {
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34 | topic?: Topic;
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35 | };
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36 | export declare type SubscriptionCloseCallback = (err?: Error) => void;
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37 | declare type SubscriptionCallback = ResourceCallback<Subscription, google.pubsub.v1.ISubscription>;
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38 | declare type SubscriptionResponse = [Subscription, google.pubsub.v1.ISubscription];
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39 | export declare type CreateSubscriptionOptions = SubscriptionMetadata & {
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40 | gaxOpts?: CallOptions;
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41 | flowControl?: FlowControlOptions;
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42 | };
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43 | export declare type CreateSubscriptionCallback = SubscriptionCallback;
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44 | export declare type CreateSubscriptionResponse = SubscriptionResponse;
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45 | export declare type GetSubscriptionOptions = CallOptions & {
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46 | autoCreate?: boolean;
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47 | };
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48 | export declare type GetSubscriptionCallback = SubscriptionCallback;
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49 | export declare type GetSubscriptionResponse = SubscriptionResponse;
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50 | declare type MetadataCallback = RequestCallback<google.pubsub.v1.ISubscription>;
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51 | declare type MetadataResponse = [google.pubsub.v1.ISubscription];
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52 | export declare type GetSubscriptionMetadataCallback = MetadataCallback;
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53 | export declare type GetSubscriptionMetadataResponse = MetadataResponse;
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54 | export declare type SetSubscriptionMetadataCallback = MetadataCallback;
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55 | export declare type SetSubscriptionMetadataResponse = MetadataResponse;
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56 | export declare type DetachSubscriptionCallback = EmptyCallback;
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57 | export declare type DetachSubscriptionResponse = EmptyResponse;
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58 | /**
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59 | * @typedef {object} ExpirationPolicy
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60 | * A policy that specifies the conditions for this subscription's expiration. A
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61 | * subscription is considered active as long as any connected subscriber is
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62 | * successfully consuming messages from the subscription or is issuing
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63 | * operations on the subscription. If expirationPolicy is not set, a default
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64 | * policy with ttl of 31 days will be used. The minimum allowed value for
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65 | * expirationPolicy.ttl is 1 day.
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66 | * @property {google.protobuf.Duration} ttl Specifies the "time-to-live"
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67 | * duration for an associated resource. The resource expires if it is not
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68 | * active for a period of `ttl`. The definition of "activity" depends on the
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69 | * type of the associated resource. The minimum and maximum allowed values
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70 | * for `ttl` depend on the type of the associated resource, as well. If
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71 | * `ttl` is not set, the associated resource never expires.
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72 | */
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73 | /**
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74 | * A Subscription object will give you access to your Cloud Pub/Sub
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75 | * subscription.
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76 | *
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77 | * Subscriptions are sometimes retrieved when using various methods:
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78 | *
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79 | * - {@link PubSub#getSubscriptions}
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80 | * - {@link Topic#getSubscriptions}
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81 | *
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82 | * Subscription objects may be created directly with:
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83 | *
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84 | * - {@link PubSub#createSubscription}
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85 | * - {@link Topic#createSubscription}
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86 | *
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87 | * All Subscription objects are instances of an
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88 | * [EventEmitter](http://nodejs.org/api/events.html). The subscription will pull
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89 | * for messages automatically as long as there is at least one listener assigned
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90 | * for the `message` event. Available events:
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91 | *
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92 | * Upon receipt of a message:
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93 | * on(event: 'message', listener: (message: {@link Message}) => void): this;
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94 | *
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95 | * Upon receipt of an error:
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96 | * on(event: 'error', listener: (error: Error) => void): this;
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97 | *
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98 | * Upon the closing of the subscriber:
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99 | * on(event: 'close', listener: Function): this;
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100 | *
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101 | * By default Subscription objects allow you to process 100 messages at the same
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102 | * time. You can fine tune this value by adjusting the
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103 | * `options.flowControl.maxMessages` option.
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104 | *
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105 | * If your subscription is seeing more re-deliveries than preferable, you might
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106 | * try increasing your `options.ackDeadline` value or decreasing the
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107 | * `options.streamingOptions.maxStreams` value.
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108 | *
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109 | * Subscription objects handle ack management, by automatically extending the
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110 | * ack deadline while the message is being processed, to then issue the ack or
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111 | * nack of such message when the processing is done. **Note:** message
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112 | * redelivery is still possible.
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113 | *
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114 | * By default each {@link PubSub} instance can handle 100 open streams, with
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115 | * default options this translates to less than 20 Subscriptions per PubSub
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116 | * instance. If you wish to create more Subscriptions than that, you can either
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117 | * create multiple PubSub instances or lower the
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118 | * `options.streamingOptions.maxStreams` value on each Subscription object.
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119 | *
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120 | * @class
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121 | *
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122 | * @param {PubSub} pubsub PubSub object.
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123 | * @param {string} name The name of the subscription.
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124 | * @param {SubscriberOptions} [options] Options for handling messages.
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125 | *
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126 | * @example <caption>From {@link PubSub#getSubscriptions}</caption>
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127 | * const {PubSub} = require('@google-cloud/pubsub');
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128 | * const pubsub = new PubSub();
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129 | *
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130 | * pubsub.getSubscriptions((err, subscriptions) => {
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131 | * // `subscriptions` is an array of Subscription objects.
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132 | * });
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133 | *
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134 | * @example <caption>From {@link Topic#getSubscriptions}</caption>
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135 | * const topic = pubsub.topic('my-topic');
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136 | * topic.getSubscriptions((err, subscriptions) => {
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137 | * // `subscriptions` is an array of Subscription objects.
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138 | * });
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139 | *
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140 | * @example <caption>{@link Topic#createSubscription}</caption>
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141 | * const topic = pubsub.topic('my-topic');
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142 | * topic.createSubscription('new-subscription', (err, subscription) => {
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143 | * // `subscription` is a Subscription object.
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144 | * });
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145 | *
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146 | * @example <caption>{@link Topic#subscription}</caption>
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147 | * const topic = pubsub.topic('my-topic');
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148 | * const subscription = topic.subscription('my-subscription');
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149 | * // `subscription` is a Subscription object.
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150 | *
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151 | * @example <caption>Once you have obtained a subscription object, you may begin
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152 | * to register listeners. This will automatically trigger pulling for messages.
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153 | * </caption>
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154 | * // Register an error handler.
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155 | * subscription.on('error', (err) => {});
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156 | *
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157 | * // Register a close handler in case the subscriber closes unexpectedly
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158 | * subscription.on('close', () => {});
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159 | *
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160 | * // Register a listener for `message` events.
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161 | * function onMessage(message) {
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162 | * // Called every time a message is received.
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163 | *
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164 | * // message.id = ID of the message.
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165 | * // message.ackId = ID used to acknowledge the message receival.
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166 | * // message.data = Contents of the message.
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167 | * // message.attributes = Attributes of the message.
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168 | * // message.publishTime = Date when Pub/Sub received the message.
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169 | *
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170 | * // Ack the message:
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171 | * // message.ack();
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172 | *
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173 | * // This doesn't ack the message, but allows more messages to be retrieved
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174 | * // if your limit was hit or if you don't want to ack the message.
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175 | * // message.nack();
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176 | * }
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177 | * subscription.on('message', onMessage);
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178 | *
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179 | * // Remove the listener from receiving `message` events.
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180 | * subscription.removeListener('message', onMessage);
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181 | *
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182 | * @example <caption>To apply a fine level of flow control, consider the
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183 | * following configuration</caption>
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184 | * const subscription = topic.subscription('my-sub', {
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185 | * flowControl: {
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186 | * maxMessages: 1,
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187 | * // this tells the client to manage and lock any excess messages
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188 | * allowExcessMessages: false
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189 | * }
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190 | * });
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191 | */
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192 | export declare class Subscription extends EventEmitter {
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193 | pubsub: PubSub;
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194 | iam: IAM;
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195 | name: string;
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196 | topic?: Topic | string;
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197 | metadata?: google.pubsub.v1.ISubscription;
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198 | request: typeof PubSub.prototype.request;
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199 | private _subscriber;
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200 | constructor(pubsub: PubSub, name: string, options?: SubscriptionOptions);
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201 | /**
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202 | * Indicates if the Subscription is open and receiving messages.
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203 | *
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204 | * @type {boolean}
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205 | */
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206 | get isOpen(): boolean;
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207 | /**
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208 | * @type {string}
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209 | */
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210 | get projectId(): string;
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211 | close(): Promise<void>;
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212 | close(callback: SubscriptionCloseCallback): void;
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213 | create(options?: CreateSubscriptionOptions): Promise<CreateSubscriptionResponse>;
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214 | create(callback: CreateSubscriptionCallback): void;
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215 | create(options: CreateSubscriptionOptions, callback: CreateSubscriptionCallback): void;
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216 | createSnapshot(name: string, gaxOpts?: CallOptions): Promise<CreateSnapshotResponse>;
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217 | createSnapshot(name: string, callback: CreateSnapshotCallback): void;
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218 | createSnapshot(name: string, gaxOpts: CallOptions, callback: CreateSnapshotCallback): void;
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219 | delete(gaxOpts?: CallOptions): Promise<EmptyResponse>;
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220 | delete(callback: EmptyCallback): void;
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221 | delete(gaxOpts: CallOptions, callback: EmptyCallback): void;
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222 | detached(): Promise<DetachedResponse>;
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223 | detached(callback: DetachedCallback): void;
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224 | exists(): Promise<ExistsResponse>;
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225 | exists(callback: ExistsCallback): void;
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226 | get(gaxOpts?: GetSubscriptionOptions): Promise<GetSubscriptionResponse>;
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227 | get(callback: GetSubscriptionCallback): void;
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228 | get(gaxOpts: GetSubscriptionOptions, callback: GetSubscriptionCallback): void;
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229 | getMetadata(gaxOpts?: CallOptions): Promise<GetSubscriptionMetadataResponse>;
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230 | getMetadata(callback: GetSubscriptionMetadataCallback): void;
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231 | getMetadata(gaxOpts: CallOptions, callback: GetSubscriptionMetadataCallback): void;
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232 | modifyPushConfig(config: PushConfig, gaxOpts?: CallOptions): Promise<EmptyResponse>;
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233 | modifyPushConfig(config: PushConfig, callback: EmptyCallback): void;
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234 | modifyPushConfig(config: PushConfig, gaxOpts: CallOptions, callback: EmptyCallback): void;
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235 | /**
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236 | * Opens the Subscription to receive messages. In general this method
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237 | * shouldn't need to be called, unless you wish to receive messages after
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238 | * calling {@link Subscription#close}. Alternatively one could just assign a
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239 | * new `message` event listener which will also re-open the Subscription.
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240 | *
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241 | * @example
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242 | * subscription.on('message', message => message.ack());
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243 | *
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244 | * // Close the subscription.
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245 | * subscription.close(err => {
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246 | * if (err) {
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247 | * // Error handling omitted.
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248 | * }
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249 | *
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250 | * The subscription has been closed and messages will no longer be received.
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251 | * });
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252 | *
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253 | * // Resume receiving messages.
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254 | * subscription.open();
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255 | */
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256 | open(): void;
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257 | seek(snapshot: string | Date, gaxOpts?: CallOptions): Promise<SeekResponse>;
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258 | seek(snapshot: string | Date, callback: SeekCallback): void;
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259 | seek(snapshot: string | Date, gaxOpts: CallOptions, callback: SeekCallback): void;
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260 | setMetadata(metadata: SubscriptionMetadata, gaxOpts?: CallOptions): Promise<SetSubscriptionMetadataResponse>;
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261 | setMetadata(metadata: SubscriptionMetadata, callback: SetSubscriptionMetadataCallback): void;
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262 | setMetadata(metadata: SubscriptionMetadata, gaxOpts: CallOptions, callback: SetSubscriptionMetadataCallback): void;
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263 | /**
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264 | * Sets the Subscription options.
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265 | *
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266 | * @param {SubscriberOptions} options The options.
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267 | */
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268 | setOptions(options: SubscriberOptions): void;
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269 | /**
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270 | * Create a Snapshot object. See {@link Subscription#createSnapshot} to
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271 | * create a snapshot.
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272 | *
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273 | * @throws {Error} If a name is not provided.
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274 | *
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275 | * @param {string} name The name of the snapshot.
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276 | * @returns {Snapshot}
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277 | *
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278 | * @example
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279 | * const snapshot = subscription.snapshot('my-snapshot');
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280 | */
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281 | snapshot(name: string): Snapshot;
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282 | /**
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283 | * Watches for incoming message event handlers and open/closes the
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284 | * subscriber as needed.
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285 | *
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286 | * @private
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287 | */
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288 | private _listen;
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289 | /*!
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290 | * Formats Subscription metadata.
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291 | *
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292 | * @private
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293 | */
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294 | static formatMetadata_(metadata: SubscriptionMetadata): google.pubsub.v1.ISubscription;
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295 | /*!
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296 | * Format the name of a subscription. A subscription's full name is in the
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297 | * format of projects/{projectId}/subscriptions/{subName}.
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298 | *
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299 | * @private
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300 | */
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301 | static formatName_(projectId: string, name: string): string;
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302 | }
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303 | export {};
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