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Refactor rounds logic - Closes #543 #597
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,155 @@ | ||
| 'use strict'; | ||
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| var Promise = require('bluebird'); | ||
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| // Init global module variables | ||
| var db, bus, logger; | ||
| // Global connection for permanent event listeners | ||
| var connection; | ||
| // Map channels to bus.message events | ||
| var channels = { | ||
| 'round-closed': 'finishRound', | ||
| 'round-reopened': 'finishRound' | ||
| }; | ||
|
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| function onNotification (data) { | ||
| logger.debug('pg-notify: Notification received', {channel: data.channel, data: data.payload}); | ||
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| if (!channels[data.channel]) { | ||
| // Channel is invalid - should never happen | ||
| logger.error('pg-notify: Invalid channel', data.channel); | ||
| return; | ||
| } | ||
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| // Process round-releated things | ||
| if (data.channel === 'round-closed') { | ||
| data.payload = parseInt(data.payload); | ||
| logger.info('pg-notify: Round closed', data.payload); | ||
| // Set new round | ||
| data.payload += 1; | ||
| } else if (data.channel === 'round-reopened') { | ||
| data.payload = parseInt(data.payload); | ||
| logger.warn('pg-notify: Round reopened', data.payload); | ||
| } else { | ||
| // Channel is not supported - should never happen | ||
| logger.error('pg-notify: Channel not supported', data.channel); | ||
| return; | ||
| } | ||
|
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| // Broadcast notify via events | ||
| bus.message(channels[data.channel], data.payload); | ||
| } | ||
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| // Generate list of queries for listen to every supported channels | ||
| function listenQueries (t) { | ||
| var queries = []; | ||
| Object.keys(channels).forEach(function (channel) { | ||
| queries.push(t.none('LISTEN $1~', channel)); | ||
| }); | ||
| return t.batch(queries); | ||
| } | ||
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| function setListeners (client, cb) { | ||
| client.on('notification', onNotification); | ||
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| connection.task(listenQueries) | ||
| .then(function () { | ||
| return setImmediate(cb); | ||
| }) | ||
| .catch(function (err) { | ||
| logger.error('pg-notify: Failed to execute LISTEN queries', err); | ||
| return setImmediate(cb, err); | ||
| }); | ||
| } | ||
|
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| // Generate list of queries for unlisten to every supported channels | ||
|
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| function unlistenQueries (t) { | ||
| var queries = []; | ||
| Object.keys(channels).forEach(function (channel) { | ||
| queries.push(t.none('UNLISTEN $1~', channel)); | ||
| }); | ||
| return t.batch(queries); | ||
| } | ||
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| function removeListeners (client, cb) { | ||
| client.removeListener('notification', onNotification); | ||
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| if (connection) { | ||
| connection.task(unlistenQueries) | ||
| .then(function () { | ||
| return setImmediate(cb); | ||
| }) | ||
| .catch(function (err) { | ||
| logger.error('pg-notify: Failed to execute UNLISTEN queries', err); | ||
| return setImmediate(cb, err); | ||
| }); | ||
| } else { | ||
| return setImmediate(cb); | ||
| } | ||
| } | ||
|
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| function onConnectionLost (err, e) { | ||
| logger.error('pg-notify: Connection lost', err); | ||
| // Prevent use of the connection | ||
| connection = null; | ||
| // We don't care about error here, so passing empty function as callback | ||
| removeListeners(e.client, function () {}); | ||
| // Try to re-establish connection 10 times, every 5 seconds | ||
| reconnect(5000, 10) | ||
| .then(function (obj) { | ||
| logger.info('pg-notify: Reconnected successfully'); | ||
| }) | ||
| .catch(function () { | ||
| // Failed after 10 attempts | ||
| logger.error('pg-notify: Failed to reconnect - connection lost'); | ||
| process.exit(); | ||
| }); | ||
| } | ||
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| function reconnect (delay, maxAttempts) { | ||
| delay = delay > 0 ? delay : 0; | ||
| maxAttempts = maxAttempts > 0 ? maxAttempts : 1; | ||
| return new Promise(function (resolve, reject) { | ||
| setTimeout(function () { | ||
| db.connect({direct: true, onLost: onConnectionLost}) | ||
| .then(function (obj) { | ||
| // Global connection is now available | ||
| connection = obj; | ||
| setListeners(obj.client, function (err) { | ||
| if (err) { | ||
| reject(err); | ||
| } else { | ||
| resolve(obj); | ||
| } | ||
| }); | ||
| }) | ||
| .catch(function (err) { | ||
| logger.error('pg-notify: Error connecting', err); | ||
| if (--maxAttempts) { | ||
| reconnect(delay, maxAttempts) | ||
| .then(resolve) | ||
| .catch(reject); | ||
| } else { | ||
| reject(err); | ||
| } | ||
| }); | ||
| }, delay); | ||
| }); | ||
| } | ||
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| module.exports.init = function (_db, _bus, _logger, cb) { | ||
| db = _db; | ||
| bus = _bus; | ||
| logger = _logger; | ||
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| reconnect () | ||
| .then(function (obj) { | ||
| logger.info('pg-notify: Initial connection estabilished'); | ||
| return setImmediate(cb); | ||
| }) | ||
| .catch(function (err) { | ||
| logger.error('pg-notify: Initial connection failed', err); | ||
| // Error is passed to callback here, so node will not start in that case | ||
| return setImmediate(cb, err); | ||
| }); | ||
| }; | ||
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Process round-related things