36d5dc1719
- Extract from job subcriber everything related to queue dicovering - Job Queue is responsible of queue dicovering and exposes functions to scan user queues. - Batch creates an interval to consume queues - Now Batch.start() does: * Finds existing queues from metadata, adding to queue index the ones that are not indexed yet * Binds callback to process jobs for every queue found. * Inits queue consumer interval * Subscribes to PUB/SUB channel
55 lines
1.4 KiB
JavaScript
55 lines
1.4 KiB
JavaScript
'use strict';
|
|
|
|
var Channel = require('./channel');
|
|
var debug = require('./../util/debug')('pubsub:subscriber');
|
|
var error = require('./../util/debug')('pubsub:subscriber:error');
|
|
|
|
function JobSubscriber(pool) {
|
|
this.pool = pool;
|
|
}
|
|
|
|
module.exports = JobSubscriber;
|
|
|
|
JobSubscriber.prototype.subscribe = function (onJobHandler, callback) {
|
|
var self = this;
|
|
|
|
self.pool.acquire(Channel.DB, function(err, client) {
|
|
if (err) {
|
|
if (callback) {
|
|
callback(err);
|
|
}
|
|
return error('Error adquiring redis client: ' + err.message);
|
|
}
|
|
|
|
self.client = client;
|
|
client.removeAllListeners('message');
|
|
client.unsubscribe(Channel.NAME);
|
|
client.subscribe(Channel.NAME);
|
|
|
|
client.on('message', function (channel, user) {
|
|
debug('message received in channel=%s from user=%s', channel, user);
|
|
onJobHandler(user);
|
|
});
|
|
|
|
client.on('error', function () {
|
|
self.unsubscribe();
|
|
self.pool.release(Channel.DB, client);
|
|
self.subscribe(onJobHandler);
|
|
});
|
|
|
|
if (callback) {
|
|
callback();
|
|
}
|
|
});
|
|
};
|
|
|
|
JobSubscriber.prototype.unsubscribe = function (callback) {
|
|
if (this.client && this.client.connected) {
|
|
this.client.unsubscribe(Channel.NAME, callback);
|
|
} else {
|
|
if (callback) {
|
|
return callback(null);
|
|
}
|
|
}
|
|
};
|