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mastodon
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Make streaming API use one pattern-matching redis pubsub connection 

Refresh timelines when streaming API reconnects in the UI
This commit is contained in:
Eugen Rochko 2017-02-07 14:37:12 +01:00
parent 9d5fb49cd8
commit 02e91a96dd
3 changed files with 74 additions and 36 deletions
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7
app/assets/javascripts/components/containers/mastodon.jsx
View File

@ -6,7 +6,7 @@ import {
deleteFromTimelines,
refreshTimeline
} from '../actions/timelines';
import { updateNotifications } from '../actions/notifications';
import { updateNotifications, refreshNotifications } from '../actions/notifications';
import createBrowserHistory from 'history/lib/createBrowserHistory';
import {
applyRouterMiddleware,
@ -80,6 +80,11 @@ const Mastodon = React.createClass({
store.dispatch(updateNotifications(JSON.parse(data.payload), getMessagesForLocale(locale), locale));
break;
}
},
reconnected () {
store.dispatch(refreshTimeline('home'));
store.dispatch(refreshNotifications());
}
});

3
app/assets/javascripts/components/stream.jsx
View File

@ -10,12 +10,13 @@ const createWebSocketURL = (url) => {
return a.href;
};
export default function getStream(accessToken, stream, { connected, received, disconnected }) {
export default function getStream(accessToken, stream, { connected, received, disconnected, reconnected }) {
const ws = new WebSocketClient(`${createWebSocketURL(STREAMING_API_BASE_URL)}/api/v1/streaming/?access_token=${accessToken}&stream=${stream}`);
ws.onopen = connected;
ws.onmessage = e => received(JSON.parse(e.data));
ws.onclose = disconnected;
ws.onreconnect = reconnected;
return ws;
};

92
streaming/index.js
View File

@ -36,6 +36,39 @@ const pgPool = new pg.Pool(pgConfigs[env])
const server = http.createServer(app)
const wss = new WebSocket.Server({ server })
const redisClient = redis.createClient({
host: process.env.REDIS_HOST || '127.0.0.1',
port: process.env.REDIS_PORT || 6379,
password: process.env.REDIS_PASSWORD
})
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('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')
@ -105,10 +138,10 @@ const errorMiddleware = (err, req, res, next) => {
const placeholders = (arr, shift = 0) => arr.map((_, i) => `$${i + 1 + shift}`).join(', ');
const streamFrom = (redisClient, id, req, output, needsFiltering = false) => {
const streamFrom = (id, req, output, attachCloseHandler, needsFiltering = false) => {
log.verbose(req.requestId, `Starting stream from ${id} for ${req.accountId}`)
redisClient.on('message', (channel, message) => {
const listener = message => {
const { event, payload, queued_at } = JSON.parse(message)
const transmit = () => {
@ -149,13 +182,14 @@ const streamFrom = (redisClient, id, req, output, needsFiltering = false) => {
} else {
transmit()
}
})
}
redisClient.subscribe(id)
subscribe(id, listener)
attachCloseHandler(id, listener)
}
// Setup stream output to HTTP
const streamToHttp = (req, res, redisClient) => {
const streamToHttp = (req, res) => {
res.setHeader('Content-Type', 'text/event-stream')
res.setHeader('Transfer-Encoding', 'chunked')
@ -164,7 +198,6 @@ const streamToHttp = (req, res, redisClient) => {
req.on('close', () => {
log.verbose(req.requestId, `Ending stream for ${req.accountId}`)
clearInterval(heartbeat)
redisClient.quit()
})
return (event, payload) => {
@ -173,11 +206,17 @@ const streamToHttp = (req, res, redisClient) => {
}
}
// 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, redisClient) => {
const streamToWs = (req, ws) => {
ws.on('close', () => {
log.verbose(req.requestId, `Ending stream for ${req.accountId}`)
redisClient.quit()
})
return (event, payload) => {
@ -190,12 +229,12 @@ const streamToWs = (req, ws, redisClient) => {
}
}
// Get new redis connection
const getRedisClient = () => redis.createClient({
host: process.env.REDIS_HOST || '127.0.0.1',
port: process.env.REDIS_PORT || 6379,
password: process.env.REDIS_PASSWORD
// Setup stream end for WebSockets
const streamWsEnd = ws => (id, listener) => {
ws.on('close', () => {
unsubscribe(id, listener)
})
}
app.use(setRequestId)
app.use(allowCrossDomain)
@ -203,28 +242,23 @@ app.use(authenticationMiddleware)
app.use(errorMiddleware)
app.get('/api/v1/streaming/user', (req, res) => {
const redisClient = getRedisClient()
streamFrom(redisClient, `timeline:${req.accountId}`, req, streamToHttp(req, res, redisClient))
streamFrom(`timeline:${req.accountId}`, req, streamToHttp(req, res), streamHttpEnd(req))
})
app.get('/api/v1/streaming/public', (req, res) => {
const redisClient = getRedisClient()
streamFrom(redisClient, 'timeline:public', req, streamToHttp(req, res, redisClient), true)
streamFrom('timeline:public', req, streamToHttp(req, res), streamHttpEnd(req), true)
})
app.get('/api/v1/streaming/public/local', (req, res) => {
const redisClient = getRedisClient()
streamFrom(redisClient, 'timeline:public:local', req, streamToHttp(req, res, redisClient), true)
streamFrom('timeline:public:local', req, streamToHttp(req, res), streamHttpEnd(req), true)
})
app.get('/api/v1/streaming/hashtag', (req, res) => {
const redisClient = getRedisClient()
streamFrom(redisClient, `timeline:hashtag:${req.params.tag}`, req, streamToHttp(req, res, redisClient), true)
streamFrom(`timeline:hashtag:${req.params.tag}`, req, streamToHttp(req, res), streamHttpEnd(req), true)
})
app.get('/api/v1/streaming/hashtag/local', (req, res) => {
const redisClient = getRedisClient()
streamFrom(redisClient, `timeline:hashtag:${req.params.tag}:local`, req, streamToHttp(req, res, redisClient), true)
streamFrom(`timeline:hashtag:${req.params.tag}:local`, req, streamToHttp(req, res), streamHttpEnd(req), true)
})
wss.on('connection', ws => {
@ -239,23 +273,21 @@ wss.on('connection', ws => {
return
}
const redisClient = getRedisClient()
switch(location.query.stream) {
case 'user':
streamFrom(redisClient, `timeline:${req.accountId}`, req, streamToWs(req, ws, redisClient))
streamFrom(`timeline:${req.accountId}`, req, streamToWs(req, ws), streamWsEnd(ws))
break;
case 'public':
streamFrom(redisClient, 'timeline:public', req, streamToWs(req, ws, redisClient), true)
streamFrom('timeline:public', req, streamToWs(req, ws), streamWsEnd(ws), true)
break;
case 'public:local':
streamFrom(redisClient, 'timeline:public:local', req, streamToWs(req, ws, redisClient), true)
streamFrom('timeline:public:local', req, streamToWs(req, ws), streamWsEnd(ws), true)
break;
case 'hashtag':
streamFrom(redisClient, `timeline:hashtag:${location.query.tag}`, req, streamToWs(req, ws, redisClient), true)
streamFrom(`timeline:hashtag:${location.query.tag}`, req, streamToWs(req, ws), streamWsEnd(ws), true)
break;
case 'hashtag:local':
streamFrom(redisClient, `timeline:hashtag:${location.query.tag}:local`, req, streamToWs(req, ws, redisClient), true)
streamFrom(`timeline:hashtag:${location.query.tag}:local`, req, streamToWs(req, ws), streamWsEnd(ws), true)
break;
default:
ws.close()