node中异步处理Promise封装调用

--所需模块

安装模块  npm install bluebird logger

需求：在node中异步调用多个api返回数据处理

封装papi模块

/** * api请求封装 */var request = require('request');var Promise = require('bluebird');var config  = require('../config'); //配置文件var logger  = require('./logger')('console');module.exports = {// POST 请求封装post  : function(req, api, params, getMoreInfo, isUpload){var formData = params || {};formData.rS    = config.rS;if(typeof req.session.scsInfor !== 'undefined'){formData.loginUid  = req.session.loginUid;formData.adUid     = req.session.adUid;}var getMoreInfo = getMoreInfo || false;var isUpload = isUpload || false;if(req.session.token){formData.token = formData.accessToken = req.session.token || '';}var baseUrl = config.server_base;if(api.indexOf('http') >= 0){baseUrl = "";}var reqConf = {url     : api,baseUrl : baseUrl,timeout : config.apiTime || 2000,time    : true,method  : "POST",headers : {},json    : true,debug   : false,gzip    : true};if(isUpload == false){reqConf.form = formData;}else{reqConf.formData = formData;}return new Promise(function(resolve, reject){logger.info('[POST]', config.server_base + api, formData);request(reqConf, function(err, response, body){if(err){if(err.code == 'ESOCKETTIMEDOUT'){reject(new Error('接口调用超时: ' + '[' + api + ']'));}reject(new Error('请求接口出错: ' + '[' + api + ']' + err.message));logger.fatal(err);}else{if(response.statusCode == 200){if(body && body.code != undefined){if(getMoreInfo){logger.info('[POST]', api, '获取code任意状态返回SUCCESS');resolve(body);}else{if(body.code == 0){logger.info('[POST]', api, 'SUCCESS');resolve(body.data);}else{var msg = body.msg || '未知';logger.error('接口返回错误: ', api, '[' + body.code + '] ', msg);var apiErr       = new Error('接口返回错误: ' + '[' + api + '] [' + body.errorCode + '] ' + msg);apiErr.errorCode = body.code;apiErr.apiMsg    = msg;reject(apiErr);}}}else{logger.fatal("接口返回格式错误 :", api, body);reject(new Error("接口返回格式错误 :" + '[' + api + ']' + JSON.stringify(body)));}}else{var msg = body.msg || '请求接口错误';logger.fatal(api, response.statusCode, msg);reject(new Error('[' + api + '] [' + response.statusCode + '] ' + msg));}}});});}, // GET 请求封装get   : function(req, api, params,callback){var qsData = params || {};qsData.rS    = config.rS;if(typeof req.session.scsInfor !== 'undefined'){qsData.loginUid  = req.session.loginUid;qsData.adUid     = req.session.adUid;qsData.agUid     = req.session.agUid;}if(req.session.token){qsData.token = req.session.token;}var baseUrl = config.server_base;if(api.indexOf('http') >= 0){baseUrl = "";}return new Promise(function(resolve, reject){logger.info('[GET]', config.server_base + api, qsData);request({url     : api,baseUrl : baseUrl,timeout :  20000,time    : true,method  : "GET",headers : {},qs      : qsData,json    : true,debug   : false,gzip    : true}, function(err, response, body){if(err){logger.fatal(api, err);if(err.code == 'ESOCKETTIMEDOUT'){reject(new Error('接口调用超时: ' + api));}reject(new Error('请求接口出错: ' + '[' + api + '] ' + err.message));}else{if(response.statusCode == 200){if(body && body.code != undefined){if(body.code == 0){logger.info('[GET]', api, 'SUCCESS');var obj =  callback ? callback(body.data) : body.data;resolve(obj);}else{var msg          = body.msg || '未知';var apiErr       = new Error('接口返回错误: [' + api + '] [' + body.code + ']' + msg);apiErr.errorCode = body.code;apiErr.apiMsg    = msg;logger.error('接口返回错误: ', api, body.code, msg);reject(apiErr);}}else{logger.fatal("接口返回格式错误 :", api, body);reject(new Error('接口返回格式错误 :[' + api + ']' + JSON.stringify(body)));}}else{console.log('错误信息',body);logger.fatal(api, response.statusCode, msg);reject(new Error('[' + api + '][' + response.statusCode + '] ' + msg));}}});});}, // 路由url生成route : function(url, params){var query  = [];var params = params || {};var href   = url || '#';for(var key in params){query.push(key + '=' + params[key]);}if(query.length){href += '?' + query.join("&");}return href;}}

封装logger模块

var log4js = require('log4js');var config = require('../config');module.exports = function(type) {var name = type || 'console';log4js.configure(config.log);var logger = log4js.getLogger(name);return logger;}

调用dome

var PAPI = require('../../utils/papi');var Promise = require('bluebird');var logger = require('../../utils/logger')('console');module.exports = function (req, res) {    // ################    // 接口调用示例    // PAPI.get(req,'user/user/token', {    //   uid: 1    // }).then(function(data) {    //   console.log("请求成功:" , data);    //   res.end();    // }).catch(function(err) {    //   console.log("#########出错了##############");    //   console.error(err);    //   res.end();    // });    // ################    // 一次调用多个接口的示例，    // then里面返回的 data是一个数组，顺序与all里定义的接口顺序一致    // 比如下例中:    //    data[0] 对应 user/user/token 接口调用返回值     //    data[1] 对应 advert/campaign/list 接口调用返回值    // Promise.all([    //   PAPI.get(req, 'user/user/token', {    //     uid: 1    //   }),    //   PAPI.post(req,'advert/campaign/list')    // ]).then(function(data){    //   console.log(data[0]);    //   res.end();    // }).catch(function(err) {    //   console.error(err);    //   res.end();    // });    // ################    // A接口调用完成后再调用B接口的示例    PAPI.get(req, 'user/user/token', {        uid: 1    }).then(function (token) {        return PAPI.post(req, 'advert/campaign/list', {            token: token.dmp_token        });    }).then(function (list) {        res.render('demos/hello', {            layout: false,            list: list        });    }).catch(function (err) {        console.error(err);        res.render('error', {            error: err        });    });}