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metu.life/streaming/index.js

431 lines
12 KiB

import os from 'os';
import throng from 'throng';
import dotenv from 'dotenv';
import express from 'express';
import http from 'http';
import redis from 'redis';
import pg from 'pg';
import log from 'npmlog';
import url from 'url';
import WebSocket from 'uws';
import uuid from 'uuid';
const env = process.env.NODE_ENV || 'development';
dotenv.config({
path: env === 'production' ? '.env.production' : '.env',
});
log.level = process.env.LOG_LEVEL || 'verbose';
const dbUrlToConfig = (dbUrl) => {
if (!dbUrl) {
return {};
}
const params = url.parse(dbUrl);
const config = {};
if (params.auth) {
[config.user, config.password] = params.auth.split(':');
}
if (params.hostname) {
config.host = params.hostname;
}
if (params.port) {
config.port = params.port;
}
if (params.pathname) {
config.database = params.pathname.split('/')[1];
}
const ssl = params.query && params.query.ssl;
if (ssl) {
config.ssl = ssl === 'true' || ssl === '1';
}
return config;
};
const redisUrlToClient = (defaultConfig, redisUrl) => {
const config = defaultConfig;
if (!redisUrl) {
return redis.createClient(config);
}
if (redisUrl.startsWith('unix://')) {
return redis.createClient(redisUrl.slice(7), config);
}
return redis.createClient(Object.assign(config, {
url: redisUrl,
}));
};
const numWorkers = +process.env.STREAMING_CLUSTER_NUM || (env === 'development' ? 1 : Math.max(os.cpus().length - 1, 1));
const startMaster = () => {
log.info(`Starting streaming API server master with ${numWorkers} workers`);
};
const startWorker = (workerId) => {
log.info(`Starting worker ${workerId}`);
const pgConfigs = {
development: {
database: 'mastodon_development',
max: 10,
},
production: {
user: process.env.DB_USER || 'mastodon',
password: process.env.DB_PASS || '',
database: process.env.DB_NAME || 'mastodon_production',
host: process.env.DB_HOST || 'localhost',
port: process.env.DB_PORT || 5432,
max: 10,
},
};
const app = express();
const pgPool = new pg.Pool(Object.assign(pgConfigs[env], dbUrlToConfig(process.env.DATABASE_URL)));
const server = http.createServer(app);
const wss = new WebSocket.Server({ server });
const redisNamespace = process.env.REDIS_NAMESPACE || null;
const redisParams = {
host: process.env.REDIS_HOST || '127.0.0.1',
port: process.env.REDIS_PORT || 6379,
db: process.env.REDIS_DB || 0,
password: process.env.REDIS_PASSWORD,
};
if (redisNamespace) {
redisParams.namespace = redisNamespace;
}
const redisPrefix = redisNamespace ? `${redisNamespace}:` : '';
const redisClient = redisUrlToClient(redisParams, process.env.REDIS_URL);
const subs = {};
redisClient.on('pmessage', (_, channel, message) => {
const callbacks = subs[channel];
log.silly(`New message on channel ${channel}`);
if (!callbacks) {
return;
}
callbacks.forEach(callback => callback(message));
});
redisClient.psubscribe(`${redisPrefix}timeline:*`);
const subscribe = (channel, callback) => {
log.silly(`Adding listener for ${channel}`);
subs[channel] = subs[channel] || [];
subs[channel].push(callback);
};
const unsubscribe = (channel, callback) => {
log.silly(`Removing listener for ${channel}`);
subs[channel] = subs[channel].filter(item => item !== callback);
};
const allowCrossDomain = (req, res, next) => {
res.header('Access-Control-Allow-Origin', '*');
res.header('Access-Control-Allow-Headers', 'Authorization, Accept, Cache-Control');
res.header('Access-Control-Allow-Methods', 'GET, OPTIONS');
next();
};
const setRequestId = (req, res, next) => {
req.requestId = uuid.v4();
res.header('X-Request-Id', req.requestId);
next();
};
const accountFromToken = (token, req, next) => {
pgPool.connect((err, client, done) => {
if (err) {
next(err);
return;
}
client.query('SELECT oauth_access_tokens.resource_owner_id, users.account_id, users.filtered_languages FROM oauth_access_tokens INNER JOIN users ON oauth_access_tokens.resource_owner_id = users.id WHERE oauth_access_tokens.token = $1 AND oauth_access_tokens.revoked_at IS NULL LIMIT 1', [token], (err, result) => {
done();
if (err) {
next(err);
return;
}
if (result.rows.length === 0) {
err = new Error('Invalid access token');
err.statusCode = 401;
next(err);
return;
}
req.accountId = result.rows[0].account_id;
req.filteredLanguages = result.rows[0].filtered_languages;
next();
});
});
};
const authenticationMiddleware = (req, res, next) => {
if (req.method === 'OPTIONS') {
next();
return;
}
const authorization = req.get('Authorization');
const accessToken = req.query.access_token;
if (!authorization && !accessToken) {
const err = new Error('Missing access token');
err.statusCode = 401;
next(err);
return;
}
const token = authorization ? authorization.replace(/^Bearer /, '') : accessToken;
accountFromToken(token, req, next);
};
const errorMiddleware = (err, req, res, next) => {
log.error(req.requestId, err.toString());
res.writeHead(err.statusCode || 500, { 'Content-Type': 'application/json' });
res.end(JSON.stringify({ error: err.statusCode ? err.toString() : 'An unexpected error occurred' }));
};
const placeholders = (arr, shift = 0) => arr.map((_, i) => `$${i + 1 + shift}`).join(', ');
const streamFrom = (id, req, output, attachCloseHandler, needsFiltering = false) => {
log.verbose(req.requestId, `Starting stream from ${id} for ${req.accountId}`);
const listener = message => {
const { event, payload, queued_at } = JSON.parse(message);
const transmit = () => {
const now = new Date().getTime();
const delta = now - queued_at;
log.silly(req.requestId, `Transmitting for ${req.accountId}: ${event} ${payload} Delay: ${delta}ms`);
output(event, payload);
};
// Only messages that may require filtering are statuses, since notifications
// are already personalized and deletes do not matter
if (needsFiltering && event === 'update') {
pgPool.connect((err, client, done) => {
if (err) {
log.error(err);
return;
}
const unpackedPayload = JSON.parse(payload);
const targetAccountIds = [unpackedPayload.account.id].concat(unpackedPayload.mentions.map(item => item.id)).concat(unpackedPayload.reblog ? [unpackedPayload.reblog.account.id] : []);
const accountDomain = unpackedPayload.account.acct.split('@')[1];
if (Array.isArray(req.filteredLanguages) && req.filteredLanguages.includes(unpackedPayload.language)) {
log.silly(req.requestId, `Message ${unpackedPayload.id} filtered by language (${unpackedPayload.language})`);
done();
return;
}
const queries = [
client.query(`SELECT 1 FROM blocks WHERE account_id = $1 AND target_account_id IN (${placeholders(targetAccountIds, 1)}) UNION SELECT 1 FROM mutes WHERE account_id = $1 AND target_account_id IN (${placeholders(targetAccountIds, 1)})`, [req.accountId].concat(targetAccountIds)),
];
if (accountDomain) {
queries.push(client.query('SELECT 1 FROM account_domain_blocks WHERE account_id = $1 AND domain = $2', [req.accountId, accountDomain]));
}
Promise.all(queries).then(values => {
done();
if (values[0].rows.length > 0 || (values.length > 1 && values[1].rows.length > 0)) {
return;
}
transmit();
}).catch(err => {
done();
log.error(err);
});
});
} else {
transmit();
}
};
subscribe(`${redisPrefix}${id}`, listener);
attachCloseHandler(`${redisPrefix}${id}`, listener);
};
// Setup stream output to HTTP
const streamToHttp = (req, res) => {
res.setHeader('Content-Type', 'text/event-stream');
res.setHeader('Transfer-Encoding', 'chunked');
const heartbeat = setInterval(() => res.write(':thump\n'), 15000);
req.on('close', () => {
log.verbose(req.requestId, `Ending stream for ${req.accountId}`);
clearInterval(heartbeat);
});
return (event, payload) => {
res.write(`event: ${event}\n`);
res.write(`data: ${payload}\n\n`);
};
};
// Setup stream end for HTTP
const streamHttpEnd = req => (id, listener) => {
req.on('close', () => {
unsubscribe(id, listener);
});
};
// Setup stream output to WebSockets
const streamToWs = (req, ws) => (event, payload) => {
if (ws.readyState !== ws.OPEN) {
log.error(req.requestId, 'Tried writing to closed socket');
return;
}
ws.send(JSON.stringify({ event, payload }));
};
// Setup stream end for WebSockets
const streamWsEnd = (req, ws) => (id, listener) => {
ws.on('close', () => {
log.verbose(req.requestId, `Ending stream for ${req.accountId}`);
unsubscribe(id, listener);
});
ws.on('error', e => {
log.verbose(req.requestId, `Ending stream for ${req.accountId}`);
unsubscribe(id, listener);
});
};
app.use(setRequestId);
app.use(allowCrossDomain);
app.use(authenticationMiddleware);
app.use(errorMiddleware);
app.get('/api/v1/streaming/user', (req, res) => {
streamFrom(`timeline:${req.accountId}`, req, streamToHttp(req, res), streamHttpEnd(req));
});
app.get('/api/v1/streaming/public', (req, res) => {
streamFrom('timeline:public', req, streamToHttp(req, res), streamHttpEnd(req), true);
});
app.get('/api/v1/streaming/public/local', (req, res) => {
streamFrom('timeline:public:local', req, streamToHttp(req, res), streamHttpEnd(req), true);
});
app.get('/api/v1/streaming/hashtag', (req, res) => {
streamFrom(`timeline:hashtag:${req.query.tag}`, req, streamToHttp(req, res), streamHttpEnd(req), true);
});
app.get('/api/v1/streaming/hashtag/local', (req, res) => {
streamFrom(`timeline:hashtag:${req.query.tag}:local`, req, streamToHttp(req, res), streamHttpEnd(req), true);
});
wss.on('connection', ws => {
const location = url.parse(ws.upgradeReq.url, true);
const token = location.query.access_token;
const req = { requestId: uuid.v4() };
ws.isAlive = true;
ws.on('pong', () => {
ws.isAlive = true;
});
accountFromToken(token, req, err => {
if (err) {
log.error(req.requestId, err);
ws.close();
return;
}
switch(location.query.stream) {
case 'user':
streamFrom(`timeline:${req.accountId}`, req, streamToWs(req, ws), streamWsEnd(req, ws));
break;
case 'public':
streamFrom('timeline:public', req, streamToWs(req, ws), streamWsEnd(req, ws), true);
break;
case 'public:local':
streamFrom('timeline:public:local', req, streamToWs(req, ws), streamWsEnd(req, ws), true);
break;
case 'hashtag':
streamFrom(`timeline:hashtag:${location.query.tag}`, req, streamToWs(req, ws), streamWsEnd(req, ws), true);
break;
case 'hashtag:local':
streamFrom(`timeline:hashtag:${location.query.tag}:local`, req, streamToWs(req, ws), streamWsEnd(req, ws), true);
break;
default:
ws.close();
}
});
});
const wsInterval = setInterval(() => {
wss.clients.forEach(ws => {
if (ws.isAlive === false) {
ws.terminate();
return;
}
ws.isAlive = false;
ws.ping('', false, true);
});
}, 30000);
server.listen(process.env.PORT || 4000, () => {
log.info(`Worker ${workerId} now listening on ${server.address().address}:${server.address().port}`);
});
const onExit = () => {
log.info(`Worker ${workerId} exiting, bye bye`);
server.close();
};
const onError = (err) => {
log.error(err);
};
process.on('SIGINT', onExit);
process.on('SIGTERM', onExit);
process.on('exit', onExit);
process.on('error', onError);
};
throng({
workers: numWorkers,
lifetime: Infinity,
start: startWorker,
master: startMaster,
});