148 lines
4.1 KiB
JavaScript
148 lines
4.1 KiB
JavaScript
/**
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* Publishes message to queue after rating
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*
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* Copyright (C) 2019 R-T Specialty, LLC.
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*
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* This file is part of liza.
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*
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* liza is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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'use strict';
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const { Trait } = require( 'easejs' );
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const RatingService = require( './RatingService' );
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/**
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* Publish message to a queue after rating
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*
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* This is an initial proof-of-concept implementation. In particular, we
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* have the following considerations:
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*
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* - A fresh connection is made for each message until we can ensure that
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* we can auto-reconnect on failure;
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* - This trait is not yet tested;
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* - It does not use an exchange;
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* - It does a poor job checking for and reporting errors.
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*
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* The message consists of a `version' header that is set to 1. Future
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* changes to the message format will bump this version. There is also a
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* `created' header holding a Unix timestamp of the moment that the message
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* was created.
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*
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* Version 1 of the body consists of four fields:
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* - quote_id
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* - agent_id
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* - entity_id
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* - entity_name
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*
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* See the body of `#_sendMessage' for their values.
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*/
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module.exports = Trait( 'RatingServicePublish' )
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.extend( RatingService,
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{
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/**
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* AMQP library (amqplib API)
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*
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* @type {amqplib}
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*/
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'private _amqp': null,
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/**
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* AMQP configuration
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*
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* This should be the configuration expected by amqplib's #connect. It
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* should additionally contain a `queueName' field.
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*
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* @type {Object}
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*/
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'private _conf': {},
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__mixin( amqp, conf )
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{
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this._amqp = amqp;
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this._conf = conf;
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},
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/**
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* Queue message post rating
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*
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* @param {UserRequest} request user request
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* @param {Object} data rating data returned
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* @param {Array} actions actions to send to client
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* @param {Program} program program used to perform rating
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* @param {Quote} quote quote used for rating
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*
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* @return {undefined}
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*/
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'override protected postProcessRaterData'(
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request, data, actions, program, quote
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)
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{
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const queue = this._conf.queueName;
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this._amqp.connect( this._conf )
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.then( conn =>
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{
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setTimeout( () => conn.close(), 10000 );
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return conn.createChannel();
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} )
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.then( ch => {
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ch.assertQueue( queue, { durable: true } );
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return this._sendMessage(
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ch,
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queue,
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request.getSession(),
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quote
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);
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} );
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this.__super( request, data, actions, program, quote );
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},
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/**
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* Send message to queue
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*
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* @param {Channel} channel AMQP channel
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* @param {string} queue queue name
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* @param {UserSession} session user session
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* @param {Quote} quote rated quote
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*
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* @return {Promise} whether sendToQueue was successful
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*/
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'private _sendMessage'( channel, queue, session, quote )
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{
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const headers = {
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version: 1,
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created: Date.now(),
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};
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const data = new Buffer( JSON.stringify( {
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quote_id: quote.getId(),
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agent_id: session.agentId(),
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entity_id: session.agentEntityId(),
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entity_name: session.agentName(),
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} ) );
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return Promise.resolve(
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channel.sendToQueue( queue, data, { headers: headers } )
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);
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},
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} );
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