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pubsub.ts
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/
pubsub.ts
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// The MIT License (MIT)
//
// Copyright (c) 2022 Firebase
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
/**
* Cloud functions to handle events from Google Cloud Pub/Sub.
* @packageDocumentation
*/
import { copyIfPresent } from "../../common/encoding";
import { ResetValue } from "../../common/options";
import { initV2Endpoint, ManifestEndpoint } from "../../runtime/manifest";
import { CloudEvent, CloudFunction } from "../core";
import { wrapTraceContext } from "../trace";
import { Expression } from "../../params";
import * as options from "../options";
import { SecretParam } from "../../params/types";
/**
* Google Cloud Pub/Sub is a globally distributed message bus that automatically scales as you need it.
* You can create a function ({@link onMessagePublished}) that handles pub/sub events by using functions.pubsub.
*
* This function triggers whenever a new pub/sub message is sent to a specific topic.
* You must specify the Pub/Sub topic name that you want to trigger your function, and set the event within the
* onPublish() event handler.
*
* PubSub Topic:
* <ul>
* <li>A resource that you can publish messages to and then consume those messages via subscriptions.
* <li>An isolated data stream for pub/sub messages.
* <li>Messages are published to a topic.
* <li>Messages are listened to via a subscription.
* <li>Each subscription listens to the messages published to exactly one topic.
*
* Subscriptions - Resource that listens to the messages published by exactly one topic.
*
* [More info here](https://firebase.google.com/docs/functions/pubsub-events)
*/
/**
* Interface representing a Google Cloud Pub/Sub message.
*
* @param data - Payload of a Pub/Sub message.
* @typeParam T - Type representing `Message.data`'s JSON format
*/
export class Message<T> {
/**
* Autogenerated ID that uniquely identifies this message.
*/
readonly messageId: string;
/**
* Time the message was published
*/
readonly publishTime: string;
/**
* The data payload of this message object as a base64-encoded string.
*/
readonly data: string;
/**
* User-defined attributes published with the message, if any.
*/
readonly attributes: { [key: string]: string };
/**
* User-defined key used to ensure ordering amongst messages with the same key.
*/
readonly orderingKey: string;
/** @hidden */
private _json: T;
/**
* @hidden
* @alpha
*/
constructor(data: any) {
this.messageId = data.messageId;
this.data = data.data;
this.attributes = data.attributes || {};
this.orderingKey = data.orderingKey || "";
this.publishTime = data.publishTime || new Date().toISOString();
this._json = data.json;
}
/**
* The JSON data payload of this message object, if any.
*/
get json(): T {
if (typeof this._json === "undefined") {
try {
this._json = JSON.parse(Buffer.from(this.data, "base64").toString("utf8"));
} catch (err) {
throw new Error(`Unable to parse Pub/Sub message data as JSON: ${err.message}`);
}
}
return this._json;
}
/**
* Returns a JSON-serializable representation of this object.
*
* @returns A JSON-serializable representation of this object.
*/
toJSON(): any {
const json: Record<string, any> = {
messageId: this.messageId,
data: this.data,
publishTime: this.publishTime,
};
if (Object.keys(this.attributes).length) {
json.attributes = this.attributes;
}
if (this.orderingKey) {
json.orderingKey = this.orderingKey;
}
return json;
}
}
/**
* The interface published in a Pub/Sub publish subscription.
* @typeParam T - Type representing `Message.data`'s JSON format
*/
export interface MessagePublishedData<T = any> {
/** Google Cloud Pub/Sub message. */
readonly message: Message<T>;
/** A subscription resource. */
readonly subscription: string;
}
/** PubSubOptions extend EventHandlerOptions but must include a topic. */
export interface PubSubOptions extends options.EventHandlerOptions {
/** The Pub/Sub topic to watch for message events */
topic: string;
/**
* If true, do not deploy or emulate this function.
*/
omit?: boolean | Expression<boolean>;
/**
* Region where functions should be deployed.
*/
region?: options.SupportedRegion | string;
/**
* Amount of memory to allocate to a function.
*/
memory?: options.MemoryOption | Expression<number> | ResetValue;
/**
* Timeout for the function in sections, possible values are 0 to 540.
* HTTPS functions can specify a higher timeout.
*
* @remarks
* The minimum timeout for a gen 2 function is 1s. The maximum timeout for a
* function depends on the type of function: Event handling functions have a
* maximum timeout of 540s (9 minutes). HTTPS and callable functions have a
* maximum timeout of 36,00s (1 hour). Task queue functions have a maximum
* timeout of 1,800s (30 minutes)
*/
timeoutSeconds?: number | Expression<number> | ResetValue;
/**
* Min number of actual instances to be running at a given time.
*
* @remarks
* Instances will be billed for memory allocation and 10% of CPU allocation
* while idle.
*/
minInstances?: number | Expression<number> | ResetValue;
/**
* Max number of instances to be running in parallel.
*/
maxInstances?: number | Expression<number> | ResetValue;
/**
* Number of requests a function can serve at once.
*
* @remarks
* Can only be applied to functions running on Cloud Functions v2.
* A value of null restores the default concurrency (80 when CPU >= 1, 1 otherwise).
* Concurrency cannot be set to any value other than 1 if `cpu` is less than 1.
* The maximum value for concurrency is 1,000.
*/
concurrency?: number | Expression<number> | ResetValue;
/**
* Fractional number of CPUs to allocate to a function.
*
* @remarks
* Defaults to 1 for functions with <= 2GB RAM and increases for larger memory sizes.
* This is different from the defaults when using the gcloud utility and is different from
* the fixed amount assigned in Google Cloud Functions generation 1.
* To revert to the CPU amounts used in gcloud or in Cloud Functions generation 1, set this
* to the value "gcf_gen1"
*/
cpu?: number | "gcf_gen1";
/**
* Connect cloud function to specified VPC connector.
*/
vpcConnector?: string | ResetValue;
/**
* Egress settings for VPC connector.
*/
vpcConnectorEgressSettings?: options.VpcEgressSetting | ResetValue;
/**
* Specific service account for the function to run as.
*/
serviceAccount?: string | ResetValue;
/**
* Ingress settings which control where this function can be called from.
*/
ingressSettings?: options.IngressSetting | ResetValue;
/**
* User labels to set on the function.
*/
labels?: Record<string, string>;
/*
* Secrets to bind to a function.
*/
secrets?: (string | SecretParam)[];
/** Whether failed executions should be delivered again. */
retry?: boolean | Expression<boolean> | ResetValue;
}
/**
* Handle a message being published to a Pub/Sub topic.
* @param topic - The Pub/Sub topic to watch for message events.
* @param handler - runs every time a Cloud Pub/Sub message is published
* @typeParam T - Type representing `Message.data`'s JSON format
*/
export function onMessagePublished<T = any>(
topic: string,
handler: (event: CloudEvent<MessagePublishedData<T>>) => any | Promise<any>
): CloudFunction<CloudEvent<MessagePublishedData<T>>>;
/**
* Handle a message being published to a Pub/Sub topic.
* @param options - Option containing information (topic) for event
* @param handler - runs every time a Cloud Pub/Sub message is published
* @typeParam T - Type representing `Message.data`'s JSON format
*/
export function onMessagePublished<T = any>(
options: PubSubOptions,
handler: (event: CloudEvent<MessagePublishedData<T>>) => any | Promise<any>
): CloudFunction<CloudEvent<MessagePublishedData<T>>>;
/**
* Handle a message being published to a Pub/Sub topic.
* @param topicOrOptions - A string representing the PubSub topic or an option (which contains the topic)
* @param handler - runs every time a Cloud Pub/Sub message is published
* @typeParam T - Type representing `Message.data`'s JSON format
*/
export function onMessagePublished<T = any>(
topicOrOptions: string | PubSubOptions,
handler: (event: CloudEvent<MessagePublishedData<T>>) => any | Promise<any>
): CloudFunction<CloudEvent<MessagePublishedData<T>>> {
let topic: string;
let opts: options.EventHandlerOptions;
if (typeof topicOrOptions === "string") {
topic = topicOrOptions;
opts = {};
} else {
topic = topicOrOptions.topic;
opts = { ...topicOrOptions };
delete (opts as any).topic;
}
const func = (raw: CloudEvent<unknown>) => {
const messagePublishedData = raw.data as {
message: unknown;
subscription: string;
};
messagePublishedData.message = new Message(messagePublishedData.message);
return wrapTraceContext(handler)(raw as CloudEvent<MessagePublishedData<T>>);
};
func.run = handler;
Object.defineProperty(func, "__trigger", {
get: () => {
const baseOpts = options.optionsToTriggerAnnotations(options.getGlobalOptions());
const specificOpts = options.optionsToTriggerAnnotations(opts);
return {
platform: "gcfv2",
...baseOpts,
...specificOpts,
labels: {
...baseOpts?.labels,
...specificOpts?.labels,
},
eventTrigger: {
eventType: "google.cloud.pubsub.topic.v1.messagePublished",
resource: `projects/${process.env.GCLOUD_PROJECT}/topics/${topic}`,
},
};
},
});
const baseOpts = options.optionsToEndpoint(options.getGlobalOptions());
const specificOpts = options.optionsToEndpoint(opts);
const endpoint: ManifestEndpoint = {
...initV2Endpoint(options.getGlobalOptions(), opts),
platform: "gcfv2",
...baseOpts,
...specificOpts,
labels: {
...baseOpts?.labels,
...specificOpts?.labels,
},
eventTrigger: {
eventType: "google.cloud.pubsub.topic.v1.messagePublished",
eventFilters: { topic },
retry: false,
},
};
copyIfPresent(endpoint.eventTrigger, opts, "retry", "retry");
func.__endpoint = endpoint;
return func;
}