ali-mns-sdk/NotifyRecv.js

The nodejs SDK for aliyun mns service

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const events_1 = require("events");
const GA_1 = require("./GA");
const MQ_1 = require("./MQ");
const Debug_1 = require("./utils/Debug");
class NotifyRecv {
    constructor(mq) {
        this._signalSTOP = true;
        this._evStopped = 'AliMNS_MQ_NOTIFY_STOPPED';
        // 连续timeout计数器
        // 在某种未知的原因下,网络底层链接断了
        // 这时在程序内部的重试无法促使网络重连,以后的重试都是徒劳的
        // 如果连续发生反复重试都依然timeout,那么极有可能已经发生此种情况了
        // 这时抛出NetworkBroken异常
        this._timeoutCount = 0;
        this._timeoutMax = 128;
        this._ga = null;
        this._mq = mq;
        // emitter
        this._emitter = new events_1.EventEmitter();
        // Google Analytics
        if (mq instanceof MQ_1.MQ) {
            const account = mq.getAccount();
            this._ga = new GA_1.GA(account.getAccountId());
            this._ga.disableGA(!account.getGA());
        }
    }
    // 消息通知.每当有消息收到时,都调用cb回调函数
    // 如果cb返回true,那么将删除消息,否则保留消息
    notifyRecv(cb, waitSeconds, numOfMessages) {
        this._signalSTOP = false;
        this._timeoutCount = 0;
        this.notifyRecvInternal(cb, waitSeconds, numOfMessages);
        // Google Analytics
        if (this._ga)
            this._ga.send('NotifyRecv.notifyRecv', 0, '');
    }
    // 停止消息通知
    notifyStopP() {
        if (this._signalSTOP)
            return Promise.resolve(this._evStopped);
        // Google Analytics
        if (this._ga)
            this._ga.send('NotifyRecv.notifyStopP', 0, '');
        this._signalSTOP = true;
        return new Promise(resolve => {
            this._emitter.once(this._evStopped, () => {
                resolve(this._evStopped);
            });
        });
    }
    notifyRecvInternal(cb, waitSeconds, numOfMessages) {
        // This signal will be triggered by notifyStopP()
        if (this._signalSTOP) {
            Debug_1.default('notifyStopped');
            this._emitter.emit(this._evStopped);
            return;
        }
        Debug_1.default('notifyRecvInternal()');
        try {
            const mqBatch = this._mq;
            mqBatch.recvP(waitSeconds, numOfMessages).then(async (dataRecv) => {
                try {
                    Debug_1.default(dataRecv);
                    this._timeoutCount = 0;
                    if (await cb(null, dataRecv)) {
                        this.deleteP(dataRecv).then(null, ex => {
                            console.log(ex);
                        });
                    }
                }
                catch (ex) {
                    // ignore any ex throw from cb
                    console.warn(ex);
                }
                this.notifyRecvInternal(cb, waitSeconds, numOfMessages);
            }, ex => {
                Debug_1.default(ex);
                if (!ex.Error || ex.Error.Code !== 'MessageNotExist') {
                    cb(ex, null);
                }
                if (ex) {
                    if (ex.message === 'timeout') {
                        this._timeoutCount++;
                        if (this._timeoutCount > this._timeoutMax) {
                            // 极度可能网络底层断了
                            cb(new Error('NetworkBroken'), null);
                        }
                    }
                    else if (ex.Error && ex.Error.Code === 'MessageNotExist') {
                        this._timeoutCount = 0;
                    }
                }
                process.nextTick(() => {
                    this.notifyRecvInternal(cb, waitSeconds, numOfMessages);
                });
            });
        }
        catch (ex) {
            // ignore any ex
            console.warn(ex);
            // 过5秒重试
            Debug_1.default('Retry after 5 seconds');
            setTimeout(() => {
                this.notifyRecvInternal(cb, waitSeconds, numOfMessages);
            }, 5000);
        }
    }
    deleteP(dataRecv) {
        if (dataRecv) {
            if (dataRecv.Message) {
                return this._mq.deleteP(dataRecv.Message.ReceiptHandle);
            }
            else if (dataRecv.Messages && dataRecv.Messages.Message) {
                const rhs = [];
                for (const msg of dataRecv.Messages.Message) {
                    rhs.push(msg.ReceiptHandle);
                }
                const mqBatch = this._mq;
                return mqBatch.deleteP(rhs);
            }
            else {
                return Promise.resolve(dataRecv);
            }
        }
        else {
            return Promise.resolve(dataRecv);
        }
    }
}
exports.NotifyRecv = NotifyRecv;
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