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55 lines
1.4 KiB
55 lines
1.4 KiB
'use strict';
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var Channel = require('./channel');
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var debug = require('./../util/debug')('pubsub:subscriber');
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var error = require('./../util/debug')('pubsub:subscriber:error');
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function JobSubscriber(pool) {
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this.pool = pool;
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}
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module.exports = JobSubscriber;
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JobSubscriber.prototype.subscribe = function (onJobHandler, callback) {
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var self = this;
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self.pool.acquire(Channel.DB, function(err, client) {
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if (err) {
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if (callback) {
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callback(err);
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}
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return error('Error adquiring redis client: ' + err.message);
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}
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self.client = client;
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client.removeAllListeners('message');
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client.unsubscribe(Channel.NAME);
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client.subscribe(Channel.NAME);
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client.on('message', function (channel, user) {
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debug('message received in channel=%s from user=%s', channel, user);
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onJobHandler(user);
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});
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client.on('error', function () {
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self.unsubscribe();
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self.pool.release(Channel.DB, client);
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self.subscribe(onJobHandler);
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});
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if (callback) {
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callback();
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}
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});
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};
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JobSubscriber.prototype.unsubscribe = function (callback) {
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if (this.client && this.client.connected) {
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this.client.unsubscribe(Channel.NAME, callback);
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} else {
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if (callback) {
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return callback(null);
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}
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}
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};
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