parallel call to different target server

Google Cloud Apigee
1

Hello All,

Here is my use case.

I want to make a concurrent/parallel call to two different target server in Apigee proxy and send results back to client. There will be responses from only one target server at a time.

I read in one apigee forum which suggests to use node js policy and use async module to make the parallel call to different target server.

I just want to know, is there any alternatives? Any built-in policy in Apigee to support this use case. Which is the best way to achieve it?

Thanks,

Mohan

2

Resource callouts will be your best bet here - Python, Java, or perhaps Javascript.

Alternatively you can create Google Cloud Function - or similar - to do the same and have Apigee call that function.

Keep in mind your security requirements in this choice.

3

@Mohan Dev Thazhathethil , Any reason you are looking for alternative ? Why not Node.JS which gets job done ?

4

@Anil Sagar Hello Anil, I just want to know any alternative options available for this? What is your suggestion

5

@Mohan Dev Thazhathethil - will recommend using NodeJS

1 Like
6

I have used javascript in past as an alternative to node and works like a charm. More details can be found here - https://community.apigee.com/articles/2340/asynchronous-http-requests-in-an-api-proxy.html

7

+1 Node.js excels at this. And you can do it in just a few lines of code. As you mentioned async module works okay. If you like Promises there’s an example for it too here https://github.com/dzuluaga/apigee-tutorials/tree/master/apiproxies/nodejs-request-promise-api.

var express = require('express')
    app = express(),
    request = require('request'),
    url = require('url'),
    promise = require('bluebird'), // you'll need bluebird or other module to convert callbacks to promises
    request = promise.promisify(require('request')); // promisify the request module

app.get('/*', function (req, res) {
  var query = url.parse(req.url).query; //get query params from url
  request('http://lyrics.wikia.com/api.php?' + query) // use promisified request module
    .then(function (response) { //this is way clean than using callbacks!
      res.json(JSON.parse(response.body));
    })
    .catch(function (err) {
      res.send(err);
    })
})
8

I have the same requirement to call two different target URLs for same condition.i mean parallel call to different endpoints always. can someone explain how JS used here

9

I have the same requirement to call two different target URLs for same condition.i mean parallel call to different endpoints always. can someone explain how JS used here