Change streaming /metrics to include additional metrics (#26299)
This commit is contained in:
Emelia Smith
GitHub
parent
b59053ff8c
commit
65096c1ccd
@ -94,6 +94,7 @@
|
||||
"pg-connection-string": "^2.6.0",
|
||||
"postcss": "^8.4.24",
|
||||
"postcss-loader": "^4.3.0",
|
||||
"prom-client": "^14.2.0",
|
||||
"prop-types": "^15.8.1",
|
||||
"punycode": "^2.3.0",
|
||||
"react": "^18.2.0",
|
||||
|
||||
@ -10,6 +10,7 @@ const { JSDOM } = require('jsdom');
|
||||
const log = require('npmlog');
|
||||
const pg = require('pg');
|
||||
const dbUrlToConfig = require('pg-connection-string').parse;
|
||||
const metrics = require('prom-client');
|
||||
const redis = require('redis');
|
||||
const uuid = require('uuid');
|
||||
const WebSocket = require('ws');
|
||||
@ -183,6 +184,73 @@ const startServer = async () => {
|
||||
const redisSubscribeClient = await redisUrlToClient(redisParams, redisUrl);
|
||||
const redisClient = await redisUrlToClient(redisParams, redisUrl);
|
||||
|
||||
// Collect metrics from Node.js
|
||||
metrics.collectDefaultMetrics();
|
||||
|
||||
new metrics.Gauge({
|
||||
name: 'pg_pool_total_connections',
|
||||
help: 'The total number of clients existing within the pool',
|
||||
collect() {
|
||||
this.set(pgPool.totalCount);
|
||||
},
|
||||
});
|
||||
|
||||
new metrics.Gauge({
|
||||
name: 'pg_pool_idle_connections',
|
||||
help: 'The number of clients which are not checked out but are currently idle in the pool',
|
||||
collect() {
|
||||
this.set(pgPool.idleCount);
|
||||
},
|
||||
});
|
||||
|
||||
new metrics.Gauge({
|
||||
name: 'pg_pool_waiting_queries',
|
||||
help: 'The number of queued requests waiting on a client when all clients are checked out',
|
||||
collect() {
|
||||
this.set(pgPool.waitingCount);
|
||||
},
|
||||
});
|
||||
|
||||
const connectedClients = new metrics.Gauge({
|
||||
name: 'connected_clients',
|
||||
help: 'The number of clients connected to the streaming server',
|
||||
labelNames: ['type'],
|
||||
});
|
||||
|
||||
connectedClients.set({ type: 'websocket' }, 0);
|
||||
connectedClients.set({ type: 'eventsource' }, 0);
|
||||
|
||||
const connectedChannels = new metrics.Gauge({
|
||||
name: 'connected_channels',
|
||||
help: 'The number of channels the streaming server is streaming to',
|
||||
labelNames: [ 'type', 'channel' ]
|
||||
});
|
||||
|
||||
const redisSubscriptions = new metrics.Gauge({
|
||||
name: 'redis_subscriptions',
|
||||
help: 'The number of Redis channels the streaming server is subscribed to',
|
||||
});
|
||||
|
||||
// When checking metrics in the browser, the favicon is requested this
|
||||
// prevents the request from falling through to the API Router, which would
|
||||
// error for this endpoint:
|
||||
app.get('/favicon.ico', (req, res) => res.status(404).end());
|
||||
|
||||
app.get('/api/v1/streaming/health', (req, res) => {
|
||||
res.writeHead(200, { 'Content-Type': 'text/plain' });
|
||||
res.end('OK');
|
||||
});
|
||||
|
||||
app.get('/metrics', async (req, res) => {
|
||||
try {
|
||||
res.set('Content-Type', metrics.register.contentType);
|
||||
res.end(await metrics.register.metrics());
|
||||
} catch (ex) {
|
||||
log.error(ex);
|
||||
res.status(500).end();
|
||||
}
|
||||
});
|
||||
|
||||
/**
|
||||
* @param {string[]} channels
|
||||
* @returns {function(): void}
|
||||
@ -240,6 +308,7 @@ const startServer = async () => {
|
||||
if (subs[channel].length === 0) {
|
||||
log.verbose(`Subscribe ${channel}`);
|
||||
redisSubscribeClient.subscribe(channel, onRedisMessage);
|
||||
redisSubscriptions.inc();
|
||||
}
|
||||
|
||||
subs[channel].push(callback);
|
||||
@ -261,6 +330,7 @@ const startServer = async () => {
|
||||
if (subs[channel].length === 0) {
|
||||
log.verbose(`Unsubscribe ${channel}`);
|
||||
redisSubscribeClient.unsubscribe(channel);
|
||||
redisSubscriptions.dec();
|
||||
delete subs[channel];
|
||||
}
|
||||
};
|
||||
@ -434,7 +504,7 @@ const startServer = async () => {
|
||||
|
||||
/**
|
||||
* @param {any} req
|
||||
* @param {string} channelName
|
||||
* @param {string|undefined} channelName
|
||||
* @returns {Promise.<void>}
|
||||
*/
|
||||
const checkScopes = (req, channelName) => new Promise((resolve, reject) => {
|
||||
@ -537,10 +607,14 @@ const startServer = async () => {
|
||||
res.on('close', () => {
|
||||
unsubscribe(`${redisPrefix}${accessTokenChannelId}`, listener);
|
||||
unsubscribe(`${redisPrefix}${systemChannelId}`, listener);
|
||||
|
||||
connectedChannels.labels({ type: 'eventsource', channel: 'system' }).dec(2);
|
||||
});
|
||||
|
||||
subscribe(`${redisPrefix}${accessTokenChannelId}`, listener);
|
||||
subscribe(`${redisPrefix}${systemChannelId}`, listener);
|
||||
|
||||
connectedChannels.labels({ type: 'eventsource', channel: 'system' }).inc(2);
|
||||
};
|
||||
|
||||
/**
|
||||
@ -554,7 +628,19 @@ const startServer = async () => {
|
||||
return;
|
||||
}
|
||||
|
||||
accountFromRequest(req).then(() => checkScopes(req, channelNameFromPath(req))).then(() => {
|
||||
const channelName = channelNameFromPath(req);
|
||||
|
||||
// If no channelName can be found for the request, then we should terminate
|
||||
// the connection, as there's nothing to stream back
|
||||
if (!channelName) {
|
||||
const err = new Error('Unknown channel requested');
|
||||
err.status = 400;
|
||||
|
||||
next(err);
|
||||
return;
|
||||
}
|
||||
|
||||
accountFromRequest(req).then(() => checkScopes(req, channelName)).then(() => {
|
||||
subscribeHttpToSystemChannel(req, res);
|
||||
}).then(() => {
|
||||
next();
|
||||
@ -849,6 +935,15 @@ const startServer = async () => {
|
||||
const streamToHttp = (req, res) => {
|
||||
const accountId = req.accountId || req.remoteAddress;
|
||||
|
||||
const channelName = channelNameFromPath(req);
|
||||
|
||||
connectedClients.labels({ type: 'eventsource' }).inc();
|
||||
|
||||
// In theory we'll always have a channel name, but channelNameFromPath can return undefined:
|
||||
if (typeof channelName === 'string') {
|
||||
connectedChannels.labels({ type: 'eventsource', channel: channelName }).inc();
|
||||
}
|
||||
|
||||
res.setHeader('Content-Type', 'text/event-stream');
|
||||
res.setHeader('Cache-Control', 'no-store');
|
||||
res.setHeader('Transfer-Encoding', 'chunked');
|
||||
@ -859,6 +954,14 @@ const startServer = async () => {
|
||||
|
||||
req.on('close', () => {
|
||||
log.verbose(req.requestId, `Ending stream for ${accountId}`);
|
||||
// We decrement these counters here instead of in streamHttpEnd as in that
|
||||
// method we don't have knowledge of the channel names
|
||||
connectedClients.labels({ type: 'eventsource' }).dec();
|
||||
// In theory we'll always have a channel name, but channelNameFromPath can return undefined:
|
||||
if (typeof channelName === 'string') {
|
||||
connectedChannels.labels({ type: 'eventsource', channel: channelName }).dec();
|
||||
}
|
||||
|
||||
clearInterval(heartbeat);
|
||||
});
|
||||
|
||||
@ -913,40 +1016,18 @@ const startServer = async () => {
|
||||
res.end(JSON.stringify({ error: 'Not found' }));
|
||||
};
|
||||
|
||||
app.use(setRequestId);
|
||||
app.use(setRemoteAddress);
|
||||
app.use(allowCrossDomain);
|
||||
const api = express.Router();
|
||||
|
||||
app.get('/api/v1/streaming/health', (req, res) => {
|
||||
res.writeHead(200, { 'Content-Type': 'text/plain' });
|
||||
res.end('OK');
|
||||
});
|
||||
app.use(api);
|
||||
|
||||
app.get('/metrics', (req, res) => server.getConnections((err, count) => {
|
||||
res.writeHeader(200, { 'Content-Type': 'application/openmetrics-text; version=1.0.0; charset=utf-8' });
|
||||
res.write('# TYPE connected_clients gauge\n');
|
||||
res.write('# HELP connected_clients The number of clients connected to the streaming server\n');
|
||||
res.write(`connected_clients ${count}.0\n`);
|
||||
res.write('# TYPE connected_channels gauge\n');
|
||||
res.write('# HELP connected_channels The number of Redis channels the streaming server is subscribed to\n');
|
||||
res.write(`connected_channels ${Object.keys(subs).length}.0\n`);
|
||||
res.write('# TYPE pg_pool_total_connections gauge\n');
|
||||
res.write('# HELP pg_pool_total_connections The total number of clients existing within the pool\n');
|
||||
res.write(`pg_pool_total_connections ${pgPool.totalCount}.0\n`);
|
||||
res.write('# TYPE pg_pool_idle_connections gauge\n');
|
||||
res.write('# HELP pg_pool_idle_connections The number of clients which are not checked out but are currently idle in the pool\n');
|
||||
res.write(`pg_pool_idle_connections ${pgPool.idleCount}.0\n`);
|
||||
res.write('# TYPE pg_pool_waiting_queries gauge\n');
|
||||
res.write('# HELP pg_pool_waiting_queries The number of queued requests waiting on a client when all clients are checked out\n');
|
||||
res.write(`pg_pool_waiting_queries ${pgPool.waitingCount}.0\n`);
|
||||
res.write('# EOF\n');
|
||||
res.end();
|
||||
}));
|
||||
api.use(setRequestId);
|
||||
api.use(setRemoteAddress);
|
||||
api.use(allowCrossDomain);
|
||||
|
||||
app.use(authenticationMiddleware);
|
||||
app.use(errorMiddleware);
|
||||
api.use(authenticationMiddleware);
|
||||
api.use(errorMiddleware);
|
||||
|
||||
app.get('/api/v1/streaming/*', (req, res) => {
|
||||
api.get('/api/v1/streaming/*', (req, res) => {
|
||||
channelNameToIds(req, channelNameFromPath(req), req.query).then(({ channelIds, options }) => {
|
||||
const onSend = streamToHttp(req, res);
|
||||
const onEnd = streamHttpEnd(req, subscriptionHeartbeat(channelIds));
|
||||
@ -1141,15 +1222,16 @@ const startServer = async () => {
|
||||
* @typedef WebSocketSession
|
||||
* @property {any} socket
|
||||
* @property {any} request
|
||||
* @property {Object.<string, { listener: SubscriptionListener, stopHeartbeat: function(): void }>} subscriptions
|
||||
* @property {Object.<string, { channelName: string, listener: SubscriptionListener, stopHeartbeat: function(): void }>} subscriptions
|
||||
*/
|
||||
|
||||
/**
|
||||
* @param {WebSocketSession} session
|
||||
* @param {string} channelName
|
||||
* @param {StreamParams} params
|
||||
* @returns {void}
|
||||
*/
|
||||
const subscribeWebsocketToChannel = ({ socket, request, subscriptions }, channelName, params) =>
|
||||
const subscribeWebsocketToChannel = ({ socket, request, subscriptions }, channelName, params) => {
|
||||
checkScopes(request, channelName).then(() => channelNameToIds(request, channelName, params)).then(({
|
||||
channelIds,
|
||||
options,
|
||||
@ -1162,7 +1244,10 @@ const startServer = async () => {
|
||||
const stopHeartbeat = subscriptionHeartbeat(channelIds);
|
||||
const listener = streamFrom(channelIds, request, onSend, undefined, options.needsFiltering);
|
||||
|
||||
connectedChannels.labels({ type: 'websocket', channel: channelName }).inc();
|
||||
|
||||
subscriptions[channelIds.join(';')] = {
|
||||
channelName,
|
||||
listener,
|
||||
stopHeartbeat,
|
||||
};
|
||||
@ -1170,35 +1255,47 @@ const startServer = async () => {
|
||||
log.verbose(request.requestId, 'Subscription error:', err.toString());
|
||||
socket.send(JSON.stringify({ error: err.toString() }));
|
||||
});
|
||||
}
|
||||
|
||||
|
||||
const removeSubscription = (subscriptions, channelIds, request) => {
|
||||
log.verbose(request.requestId, `Ending stream from ${channelIds.join(', ')} for ${request.accountId}`);
|
||||
|
||||
const subscription = subscriptions[channelIds.join(';')];
|
||||
|
||||
if (!subscription) {
|
||||
return;
|
||||
}
|
||||
|
||||
channelIds.forEach(channelId => {
|
||||
unsubscribe(`${redisPrefix}${channelId}`, subscription.listener);
|
||||
});
|
||||
|
||||
connectedChannels.labels({ type: 'websocket', channel: subscription.channelName }).dec();
|
||||
subscription.stopHeartbeat();
|
||||
|
||||
delete subscriptions[channelIds.join(';')];
|
||||
}
|
||||
|
||||
/**
|
||||
* @param {WebSocketSession} session
|
||||
* @param {string} channelName
|
||||
* @param {StreamParams} params
|
||||
* @returns {void}
|
||||
*/
|
||||
const unsubscribeWebsocketFromChannel = ({ socket, request, subscriptions }, channelName, params) =>
|
||||
const unsubscribeWebsocketFromChannel = ({ socket, request, subscriptions }, channelName, params) => {
|
||||
channelNameToIds(request, channelName, params).then(({ channelIds }) => {
|
||||
log.verbose(request.requestId, `Ending stream from ${channelIds.join(', ')} for ${request.accountId}`);
|
||||
|
||||
const subscription = subscriptions[channelIds.join(';')];
|
||||
|
||||
if (!subscription) {
|
||||
return;
|
||||
}
|
||||
|
||||
const { listener, stopHeartbeat } = subscription;
|
||||
|
||||
channelIds.forEach(channelId => {
|
||||
unsubscribe(`${redisPrefix}${channelId}`, listener);
|
||||
});
|
||||
|
||||
stopHeartbeat();
|
||||
|
||||
delete subscriptions[channelIds.join(';')];
|
||||
removeSubscription(subscriptions, channelIds, request);
|
||||
}).catch(err => {
|
||||
log.verbose(request.requestId, 'Unsubscription error:', err);
|
||||
socket.send(JSON.stringify({ error: err.toString() }));
|
||||
log.verbose(request.requestId, 'Unsubscribe error:', err);
|
||||
|
||||
// If we have a socket that is alive and open still, send the error back to the client:
|
||||
// FIXME: In other parts of the code ws === socket
|
||||
if (socket.isAlive && socket.readyState === socket.OPEN) {
|
||||
socket.send(JSON.stringify({ error: "Error unsubscribing from channel" }));
|
||||
}
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* @param {WebSocketSession} session
|
||||
@ -1219,16 +1316,20 @@ const startServer = async () => {
|
||||
subscribe(`${redisPrefix}${systemChannelId}`, listener);
|
||||
|
||||
subscriptions[accessTokenChannelId] = {
|
||||
channelName: 'system',
|
||||
listener,
|
||||
stopHeartbeat: () => {
|
||||
},
|
||||
};
|
||||
|
||||
subscriptions[systemChannelId] = {
|
||||
channelName: 'system',
|
||||
listener,
|
||||
stopHeartbeat: () => {
|
||||
},
|
||||
};
|
||||
|
||||
connectedChannels.labels({ type: 'websocket', channel: 'system' }).inc(2);
|
||||
};
|
||||
|
||||
/**
|
||||
@ -1255,6 +1356,8 @@ const startServer = async () => {
|
||||
ws.isAlive = true;
|
||||
});
|
||||
|
||||
connectedClients.labels({ type: 'websocket' }).inc();
|
||||
|
||||
/**
|
||||
* @type {WebSocketSession}
|
||||
*/
|
||||
@ -1265,17 +1368,18 @@ const startServer = async () => {
|
||||
};
|
||||
|
||||
const onEnd = () => {
|
||||
const keys = Object.keys(session.subscriptions);
|
||||
const subscriptions = Object.keys(session.subscriptions);
|
||||
|
||||
keys.forEach(channelIds => {
|
||||
const { listener, stopHeartbeat } = session.subscriptions[channelIds];
|
||||
|
||||
channelIds.split(';').forEach(channelId => {
|
||||
unsubscribe(`${redisPrefix}${channelId}`, listener);
|
||||
});
|
||||
|
||||
stopHeartbeat();
|
||||
subscriptions.forEach(channelIds => {
|
||||
removeSubscription(session.subscriptions, channelIds.split(';'), req)
|
||||
});
|
||||
|
||||
// ensure garbage collection:
|
||||
session.socket = null;
|
||||
session.request = null;
|
||||
session.subscriptions = {};
|
||||
|
||||
connectedClients.labels({ type: 'websocket' }).dec();
|
||||
};
|
||||
|
||||
ws.on('close', onEnd);
|
||||
|
||||
19
yarn.lock
19
yarn.lock
@ -3529,6 +3529,11 @@ bindings@^1.5.0:
|
||||
dependencies:
|
||||
file-uri-to-path "1.0.0"
|
||||
|
||||
bintrees@1.0.2:
|
||||
version "1.0.2"
|
||||
resolved "https://registry.yarnpkg.com/bintrees/-/bintrees-1.0.2.tgz#49f896d6e858a4a499df85c38fb399b9aff840f8"
|
||||
integrity sha512-VOMgTMwjAaUG580SXn3LacVgjurrbMme7ZZNYGSSV7mmtY6QQRh0Eg3pwIcntQ77DErK1L0NxkbetjcoXzVwKw==
|
||||
|
||||
blueimp-load-image@^3.0.0:
|
||||
version "3.0.0"
|
||||
resolved "https://registry.yarnpkg.com/blueimp-load-image/-/blueimp-load-image-3.0.0.tgz#d71c39440a7d2f1a83e3e86a625e329116a51705"
|
||||
@ -9659,6 +9664,13 @@ process@^0.11.10:
|
||||
resolved "https://registry.yarnpkg.com/process/-/process-0.11.10.tgz#7332300e840161bda3e69a1d1d91a7d4bc16f182"
|
||||
integrity sha512-cdGef/drWFoydD1JsMzuFf8100nZl+GT+yacc2bEced5f9Rjk4z+WtFUTBu9PhOi9j/jfmBPu0mMEY4wIdAF8A==
|
||||
|
||||
prom-client@^14.2.0:
|
||||
version "14.2.0"
|
||||
resolved "https://registry.yarnpkg.com/prom-client/-/prom-client-14.2.0.tgz#ca94504e64156f6506574c25fb1c34df7812cf11"
|
||||
integrity sha512-sF308EhTenb/pDRPakm+WgiN+VdM/T1RaHj1x+MvAuT8UiQP8JmOEbxVqtkbfR4LrvOg5n7ic01kRBDGXjYikA==
|
||||
dependencies:
|
||||
tdigest "^0.1.1"
|
||||
|
||||
promise-inflight@^1.0.1:
|
||||
version "1.0.1"
|
||||
resolved "https://registry.yarnpkg.com/promise-inflight/-/promise-inflight-1.0.1.tgz#98472870bf228132fcbdd868129bad12c3c029e3"
|
||||
@ -11562,6 +11574,13 @@ tar@^6.0.2:
|
||||
mkdirp "^1.0.3"
|
||||
yallist "^4.0.0"
|
||||
|
||||
tdigest@^0.1.1:
|
||||
version "0.1.2"
|
||||
resolved "https://registry.yarnpkg.com/tdigest/-/tdigest-0.1.2.tgz#96c64bac4ff10746b910b0e23b515794e12faced"
|
||||
integrity sha512-+G0LLgjjo9BZX2MfdvPfH+MKLCrxlXSYec5DaPYP1fe6Iyhf0/fSmJ0bFiZ1F8BT6cGXl2LpltQptzjXKWEkKA==
|
||||
dependencies:
|
||||
bintrees "1.0.2"
|
||||
|
||||
temp-dir@^2.0.0:
|
||||
version "2.0.0"
|
||||
resolved "https://registry.yarnpkg.com/temp-dir/-/temp-dir-2.0.0.tgz#bde92b05bdfeb1516e804c9c00ad45177f31321e"
|
||||
|
||||
Loading…
Reference in New Issue
Block a user