1 | import * as events from "events";
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2 | import * as util from "util";
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3 | import * as async from "async";
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4 | import { channelManager } from './ChannelManager';
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5 | import { Event } from "./Event";
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6 | import { EventListener } from "./EventListener";
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7 | import { promiseNodeify } from './promise-nodeify';
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8 |
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9 | var EventEmitter = events.EventEmitter,
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10 | addListenerMethods = ["addListener", "on", "once"],
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11 | copyMethods = ["removeListener", "removeAllListeners", "setMaxListeners", "listeners"];
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12 |
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13 | function parseEvent(event) {
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14 | var tmp = event.split(":");
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15 | return {
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16 | exchange: tmp[0],
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17 | topic: tmp[1]
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18 | };
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19 | }
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20 |
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21 | export interface EventsListeners {
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22 | [index: string]: EventListener
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23 | }
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24 |
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25 | export interface EventOptions {
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26 | event: string
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27 | persistent?: boolean
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28 | autoAck?: boolean
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29 | prefetchCount?: number
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30 | }
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31 |
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32 | export class AMQPEventEmitter {
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33 | runtime: string;
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34 | ee: events.EventEmitter;
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35 | private eventsListeners: EventsListeners;
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36 |
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37 | constructor(runtime) {
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38 | this.runtime = runtime || "";
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39 | this.ee = new EventEmitter();
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40 | this.eventsListeners = {};
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41 |
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42 | addListenerMethods.forEach((method) => {
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43 | this[method] = (options, cb, eventSetCb) => {
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44 | if (typeof options === "string") {
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45 | options = {
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46 | event: options
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47 | };
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48 | }
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49 | let event = options.event;
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50 | if (["newListener", "removeListener"].indexOf(event) !== -1) {
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51 | return this.ee[method].call(this.ee, event, cb);
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52 | }
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53 |
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54 |
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55 | this.ee[method].call(this.ee, event, cb);
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56 | return this.preListen(options, (err) => {
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57 | if (err) {
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58 | this.ee.removeListener(event, cb);
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59 | }
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60 | if (eventSetCb) {
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61 | eventSetCb(err);
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62 | }
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63 | });
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64 | };
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65 | });
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66 |
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67 | copyMethods.forEach((method) => {
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68 | this[method] = (...args: any[]) => {
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69 | this.ee[method].apply(this.ee, args);
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70 | };
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71 | });
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72 | }
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73 |
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74 | private preListen(options, cb) {
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75 | var event = options.event;
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76 | var eParsed = parseEvent(event);
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77 |
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78 | if (this.eventsListeners[event]) {
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79 | return cb(null);
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80 | }
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81 |
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82 | Object.assign(options, {
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83 | exchange: eParsed.exchange,
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84 | topic: eParsed.topic,
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85 | runtime: this.runtime
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86 | })
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87 | var eventListener = new EventListener(options);
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88 |
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89 | this.eventsListeners[event] = eventListener;
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90 | let promise = eventListener.listen((message, extra) => {
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91 | var content = message.content;
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92 | if (Array.isArray(content) && content.length === 1 && content[0].context && content[0].message) {
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93 |
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94 | content = content[0];
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95 | }
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96 | this.ee.emit.call(this.ee, event, content, extra);
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97 | });
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98 |
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99 | return promiseNodeify(promise, cb);
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100 | }
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101 |
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102 | emit(event, data) {
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103 | var eParsed = parseEvent(event);
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104 |
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105 | var amqpEvent = new Event({
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106 | exchange: eParsed.exchange,
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107 | topic: eParsed.topic
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108 | });
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109 |
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110 | amqpEvent.send(data);
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111 | };
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112 |
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113 | addListener(event: string | EventOptions, listener: Function, cb?: Function) { };
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114 | on(event: string | EventOptions, listener: Function, cb?: Function) { };
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115 | once(event: string | EventOptions, listener: Function, cb?: Function) { };
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116 | removeListener(event: string, listener: Function) { };
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117 | removeAllListeners(event?: string) { };
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118 | setMaxListeners(n: number) { };
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119 | listeners(event: string) { };
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120 | } |
\ | No newline at end of file |