67 lines
1.7 KiB
JavaScript
67 lines
1.7 KiB
JavaScript
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'use strict';
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const { PubSub } = require('@google-cloud/pubsub');
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/**
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* PubSubMetricsBackend
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*/
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class PubSubMetricsBackend {
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static build () {
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if (!global.environment.pubSubMetrics || !global.environment.pubSubMetrics.enabled) {
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return new PubSubMetricsBackend(undefined, false);
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}
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const pubsub = PubSubMetricsBackend.createPubSub();
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return new PubSubMetricsBackend(pubsub, true);
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}
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static createPubSub () {
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const projectId = global.environment.pubSubMetrics.project_id;
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const credentials = global.environment.pubSubMetrics.credentials;
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const config = {};
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if (projectId) {
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config.projectId = projectId;
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}
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if (credentials) {
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config.keyFilename = credentials;
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}
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return new PubSub(config);
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}
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constructor (pubSub, enabled) {
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this.pubsub = pubSub;
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this.enabled = enabled;
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}
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isEnabled () {
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return this.enabled;
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}
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_getTopic () {
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const topicName = global.environment.pubSubMetrics.topic;
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return this.pubsub.topic(topicName);
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}
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sendEvent (event, attributes) {
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if (!this.enabled) {
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return;
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}
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const data = Buffer.from(event);
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const topic = this._getTopic();
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topic.publish(data, attributes)
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.then(() => {
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console.log(`PubSubTracker: event '${event}' published to '${topic.name}'`);
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})
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.catch((error) => {
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console.error(`ERROR: pubsub middleware failed to publish event '${event}': ${error.message}`);
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});
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}
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}
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module.exports = PubSubMetricsBackend;
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