rapid-swiftpass/lib/post.js

SwiftPass module

/**
 * Copyright (c) 2017 Lucky Byte, Inc.
 */
const debug = require('debug')('swiftpass');
const winston = require('winston');
const request = require('request-promise-native');
const xml2js = require('xml2js');

/**
 * 发送请求
 *
 * 参数:
 *      dest_url:  目标地址
 *      reqt_json: 请求报文，JSON 对象
 *      options:   其他参数，JSON 对象(可选的)，可用的值包括：
 *                  * timeout: 超时时间，毫秒为单位(10-60)，默认 20
 *                  * retry:   超时重试次数(0-10)，默认 3
 * 返回
 *     响应数据
 */
const post = async (dest_url, reqt_json, options) => {
    if (!dest_url || !reqt_json) {
        throw new Error('[post]参数无效');
    }
    let retry = 3;
    let timeout = 20000;

    if (options) {
        if (options.retry >= 0 && options.retry <= 10) {
            retry = options.retry;
        } else {
            winston.warn(`[post]参数[retry][${options.retry}]不在[0-10]之间`);
        }
        if (options.timeout > 10 && options.timeout <= 60) {
            timeout = options.timeout * 1000;
        } else {
            winston.warn(`[post]参数[timeout][${options.timeout}]不在[10-60]之间`);
        }
    }

    const xml_data = new xml2js.Builder({
        rootName: 'xml', renderOpts: false, headless: true,
    }).buildObject(reqt_json);

    for (let i = 0; i < retry; i++) {
        try {
            debug(`发送威富通请求到[${dest_url}]，retry=${retry}, timeout=${timeout}`);

            return await request.post({
                headers: {
                    'user-agent': 'lucky-https/4.1',
                    'content-type': 'text/plain; charset=UTF-8',
                },
                url: dest_url,
                timeout: timeout,
                encoding: 'utf-8',
                body: xml_data,
            });
        } catch (err) {
            // 对于连接超时的情况重试，读取超时的情况不重试，以避免重复交易
            if (err.name == 'RequestError' && err.cause &&
                err.cause.code == 'ETIMEDOUT' && err.cause.connect) {
                debug(`连接服务器超时，尝试重新连接[${i+1}] ...`);
                continue;
            }
            throw err;
        }
    }
}

module.exports = post;