about summary refs log tree commit diff
path: root/streaming/index.js
blob: 156e1d4bc5e56c574537667560fc6f7407602e5d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
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 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 redisSubscribeClient = redisUrlToClient(redisParams, process.env.REDIS_URL);
  const redisClient = redisUrlToClient(redisParams, process.env.REDIS_URL);

  const subs = {};

  redisSubscribeClient.on('message', (channel, message) => {
    const callbacks = subs[channel];

    log.silly(`New message on channel ${channel}`);

    if (!callbacks) {
      return;
    }

    callbacks.forEach(callback => callback(message));
  });

  const subscriptionHeartbeat = (channel) => {
    const interval = 6*60;
    const tellSubscribed = () => {
      redisClient.set(`${redisPrefix}subscribed:${channel}`, '1', 'EX', interval*3);
    };
    tellSubscribed();
    const heartbeat = setInterval(tellSubscribed, interval*1000);
    return () => {
      clearInterval(heartbeat);
    };
  };

  const subscribe = (channel, callback) => {
    log.silly(`Adding listener for ${channel}`);
    subs[channel] = subs[channel] || [];
    if (subs[channel].length === 0) {
      log.verbose(`Subscribe ${channel}`);
      redisSubscribeClient.subscribe(channel);
    }
    subs[channel].push(callback);
  };

  const unsubscribe = (channel, callback) => {
    log.silly(`Removing listener for ${channel}`);
    subs[channel] = subs[channel].filter(item => item !== callback);
    if (subs[channel].length === 0) {
      log.verbose(`Unsubscribe ${channel}`);
      redisSubscribeClient.unsubscribe(channel);
    }
  };

  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 accountFromRequest = (req, next) => {
    const authorization = req.headers.authorization;
    const location = url.parse(req.url, true);
    const accessToken = location.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 wsVerifyClient = (info, cb) => {
    accountFromRequest(info.req, err => {
      if (!err) {
        cb(true, undefined, undefined);
      } else {
        log.error(info.req.requestId, err.toString());
        cb(false, 401, 'Unauthorized');
      }
    });
  };

  const authenticationMiddleware = (req, res, next) => {
    if (req.method === 'OPTIONS') {
      next();
      return;
    }

    accountFromRequest(req, next);
  };

  const errorMiddleware = (err, req, res, next) => {  // eslint-disable-line no-unused-vars
    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, notificationOnly = false) => {
    const streamType = notificationOnly ? ' (notification)' : '';
    log.verbose(req.requestId, `Starting stream from ${id} for ${req.accountId}${streamType}`);

    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);
      };

      if (notificationOnly && event !== 'notification') {
        return;
      }

      // 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));
          const accountDomain    = unpackedPayload.account.acct.split('@')[1];

          if (Array.isArray(req.filteredLanguages) && req.filteredLanguages.indexOf(unpackedPayload.language) !== -1) {
            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, 2)})) OR (account_id = $2 AND target_account_id = $1) UNION SELECT 1 FROM mutes WHERE account_id = $1 AND target_account_id IN (${placeholders(targetAccountIds, 2)})`, [req.accountId, unpackedPayload.account.id].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, closeHandler = false) => (id, listener) => {
    req.on('close', () => {
      unsubscribe(id, listener);
      if (closeHandler) {
        closeHandler();
      }
    });
  };

  // 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, closeHandler = false) => (id, listener) => {
    ws.on('close', () => {
      log.verbose(req.requestId, `Ending stream for ${req.accountId}`);
      unsubscribe(id, listener);
      if (closeHandler) {
        closeHandler();
      }
    });

    ws.on('error', () => {
      log.verbose(req.requestId, `Ending stream for ${req.accountId}`);
      unsubscribe(id, listener);
      if (closeHandler) {
        closeHandler();
      }
    });
  };

  app.use(setRequestId);
  app.use(allowCrossDomain);
  app.use(authenticationMiddleware);
  app.use(errorMiddleware);

  app.get('/api/v1/streaming/user', (req, res) => {
    const channel = `timeline:${req.accountId}`;
    streamFrom(channel, req, streamToHttp(req, res), streamHttpEnd(req, subscriptionHeartbeat(channel)));
  });

  app.get('/api/v1/streaming/user/notification', (req, res) => {
    streamFrom(`timeline:${req.accountId}`, req, streamToHttp(req, res), streamHttpEnd(req), false, true);
  });

  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);
  });

  const wss    = new WebSocket.Server({ server, verifyClient: wsVerifyClient });

  wss.on('connection', ws => {
    const req      = ws.upgradeReq;
    const location = url.parse(req.url, true);
    req.requestId  = uuid.v4();

    ws.isAlive = true;

    ws.on('pong', () => {
      ws.isAlive = true;
    });

    switch(location.query.stream) {
    case 'user':
      const channel = `timeline:${req.accountId}`;
      streamFrom(channel, req, streamToWs(req, ws), streamWsEnd(req, ws, subscriptionHeartbeat(channel)));
      break;
    case 'user:notification':
      streamFrom(`timeline:${req.accountId}`, req, streamToWs(req, ws), streamWsEnd(req, ws), false, true);
      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();
    }
  });

  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,
});