collect data

[Tomas Garijo]

Hello. 

I need to call many servers with xml documents. Some servers can last more time to response and others less. After some time I have collect   all responses and  make a xml document. What mechanism I have to use to implement this?

Regards.

[Tim Davis]

Hi. Here is a simple example using promises.

'use strict';

// require the `request` module

var request = require('request');

// `gets` will hold an array of requests to send

var gets = [];

// here are the APIs you want to hit

var endpoints = [

  'http://endpoint1.com',

  'http://endpoint2.com',

  'http://endpoint3.com'

];

// build up the `gets` array

endpoints.forEach(function (url) {

  var req = new Promise(function (resolve, reject) {

    // this is a simple GET with the `request` module

    return request(url, function (err, res, body) {
      // success: resolve the body content

      if (!err && res.statusCode === 200) {
        return resolve(body);
      }

      else {
        // reject with a useful error
        reject(YouErrorHere);
      }

    });

  });

  gets.push(req);

});

// send all requests and wait until they have all succeeded or one give an error

return Promise.all(gets)

  .then(function (responseObjects) {

    // do something with array of response objects

  });

[Tim Davis]

You can use the "async" package or Promise.all to call your processResponses function when all requests have completed.

[Tomas Garijo]

Ok Thank You.

Regards