Refactor streaming to simplify for logging change (#28056)
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Emelia Smith
GitHub
parent
4949b6da58
commit
a4de0e364b
@ -12,10 +12,12 @@ const { JSDOM } = require('jsdom');
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const log = require('npmlog');
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const pg = require('pg');
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const dbUrlToConfig = require('pg-connection-string').parse;
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const metrics = require('prom-client');
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const uuid = require('uuid');
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const WebSocket = require('ws');
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const { setupMetrics } = require('./metrics');
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const { isTruthy } = require("./utils");
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const environment = process.env.NODE_ENV || 'development';
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// Correctly detect and load .env or .env.production file based on environment:
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@ -196,78 +198,15 @@ const startServer = async () => {
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const redisClient = await createRedisClient(redisConfig);
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const { redisPrefix } = redisConfig;
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// Collect metrics from Node.js
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metrics.collectDefaultMetrics();
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new metrics.Gauge({
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name: 'pg_pool_total_connections',
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help: 'The total number of clients existing within the pool',
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collect() {
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this.set(pgPool.totalCount);
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},
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});
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new metrics.Gauge({
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name: 'pg_pool_idle_connections',
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help: 'The number of clients which are not checked out but are currently idle in the pool',
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collect() {
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this.set(pgPool.idleCount);
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},
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});
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new metrics.Gauge({
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name: 'pg_pool_waiting_queries',
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help: 'The number of queued requests waiting on a client when all clients are checked out',
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collect() {
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this.set(pgPool.waitingCount);
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},
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});
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const connectedClients = new metrics.Gauge({
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name: 'connected_clients',
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help: 'The number of clients connected to the streaming server',
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labelNames: ['type'],
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});
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const connectedChannels = new metrics.Gauge({
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name: 'connected_channels',
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help: 'The number of channels the streaming server is streaming to',
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labelNames: [ 'type', 'channel' ]
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});
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const redisSubscriptions = new metrics.Gauge({
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name: 'redis_subscriptions',
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help: 'The number of Redis channels the streaming server is subscribed to',
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});
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const redisMessagesReceived = new metrics.Counter({
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name: 'redis_messages_received_total',
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help: 'The total number of messages the streaming server has received from redis subscriptions'
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});
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const messagesSent = new metrics.Counter({
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name: 'messages_sent_total',
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help: 'The total number of messages the streaming server sent to clients per connection type',
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labelNames: [ 'type' ]
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});
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// Prime the gauges so we don't loose metrics between restarts:
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redisSubscriptions.set(0);
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connectedClients.set({ type: 'websocket' }, 0);
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connectedClients.set({ type: 'eventsource' }, 0);
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// For each channel, initialize the gauges at zero; There's only a finite set of channels available
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CHANNEL_NAMES.forEach(( channel ) => {
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connectedChannels.set({ type: 'websocket', channel }, 0);
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connectedChannels.set({ type: 'eventsource', channel }, 0);
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});
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// Prime the counters so that we don't loose metrics between restarts.
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// Unfortunately counters don't support the set() API, so instead I'm using
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// inc(0) to achieve the same result.
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redisMessagesReceived.inc(0);
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messagesSent.inc({ type: 'websocket' }, 0);
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messagesSent.inc({ type: 'eventsource' }, 0);
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const metrics = setupMetrics(CHANNEL_NAMES, pgPool);
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// TODO: migrate all metrics to metrics.X.method() instead of just X.method()
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const {
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connectedClients,
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connectedChannels,
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redisSubscriptions,
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redisMessagesReceived,
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messagesSent,
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} = metrics;
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// When checking metrics in the browser, the favicon is requested this
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// prevents the request from falling through to the API Router, which would
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@ -388,25 +327,6 @@ const startServer = async () => {
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}
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};
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const FALSE_VALUES = [
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false,
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0,
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'0',
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'f',
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'F',
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'false',
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'FALSE',
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'off',
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'OFF',
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];
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/**
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* @param {any} value
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* @returns {boolean}
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*/
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const isTruthy = value =>
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value && !FALSE_VALUES.includes(value);
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/**
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* @param {any} req
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* @param {any} res
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105
streaming/metrics.js
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105
streaming/metrics.js
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@ -0,0 +1,105 @@
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// @ts-check
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const metrics = require('prom-client');
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/**
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* @typedef StreamingMetrics
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* @property {metrics.Registry} register
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* @property {metrics.Gauge<"type">} connectedClients
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* @property {metrics.Gauge<"type" | "channel">} connectedChannels
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* @property {metrics.Gauge} redisSubscriptions
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* @property {metrics.Counter} redisMessagesReceived
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* @property {metrics.Counter<"type">} messagesSent
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*/
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/**
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*
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* @param {string[]} channels
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* @param {import('pg').Pool} pgPool
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* @returns {StreamingMetrics}
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*/
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function setupMetrics(channels, pgPool) {
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// Collect metrics from Node.js
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metrics.collectDefaultMetrics();
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new metrics.Gauge({
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name: 'pg_pool_total_connections',
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help: 'The total number of clients existing within the pool',
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collect() {
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this.set(pgPool.totalCount);
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},
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});
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new metrics.Gauge({
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name: 'pg_pool_idle_connections',
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help: 'The number of clients which are not checked out but are currently idle in the pool',
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collect() {
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this.set(pgPool.idleCount);
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},
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});
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new metrics.Gauge({
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name: 'pg_pool_waiting_queries',
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help: 'The number of queued requests waiting on a client when all clients are checked out',
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collect() {
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this.set(pgPool.waitingCount);
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},
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});
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const connectedClients = new metrics.Gauge({
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name: 'connected_clients',
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help: 'The number of clients connected to the streaming server',
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labelNames: ['type'],
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});
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const connectedChannels = new metrics.Gauge({
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name: 'connected_channels',
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help: 'The number of channels the streaming server is streaming to',
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labelNames: [ 'type', 'channel' ]
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});
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const redisSubscriptions = new metrics.Gauge({
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name: 'redis_subscriptions',
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help: 'The number of Redis channels the streaming server is subscribed to',
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});
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const redisMessagesReceived = new metrics.Counter({
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name: 'redis_messages_received_total',
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help: 'The total number of messages the streaming server has received from redis subscriptions'
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});
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const messagesSent = new metrics.Counter({
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name: 'messages_sent_total',
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help: 'The total number of messages the streaming server sent to clients per connection type',
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labelNames: [ 'type' ]
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});
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// Prime the gauges so we don't loose metrics between restarts:
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redisSubscriptions.set(0);
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connectedClients.set({ type: 'websocket' }, 0);
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connectedClients.set({ type: 'eventsource' }, 0);
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// For each channel, initialize the gauges at zero; There's only a finite set of channels available
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channels.forEach(( channel ) => {
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connectedChannels.set({ type: 'websocket', channel }, 0);
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connectedChannels.set({ type: 'eventsource', channel }, 0);
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});
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// Prime the counters so that we don't loose metrics between restarts.
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// Unfortunately counters don't support the set() API, so instead I'm using
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// inc(0) to achieve the same result.
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redisMessagesReceived.inc(0);
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messagesSent.inc({ type: 'websocket' }, 0);
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messagesSent.inc({ type: 'eventsource' }, 0);
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return {
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register: metrics.register,
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connectedClients,
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connectedChannels,
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redisSubscriptions,
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redisMessagesReceived,
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messagesSent,
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};
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}
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exports.setupMetrics = setupMetrics;
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22
streaming/utils.js
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22
streaming/utils.js
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@ -0,0 +1,22 @@
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// @ts-check
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const FALSE_VALUES = [
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false,
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0,
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'0',
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'f',
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'F',
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'false',
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'FALSE',
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'off',
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'OFF',
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];
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/**
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* @param {any} value
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* @returns {boolean}
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*/
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const isTruthy = value =>
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value && !FALSE_VALUES.includes(value);
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exports.isTruthy = isTruthy;
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