Azure Http Trigger function Hangup socket after the first webhook response

Question

I am using following code inside azure http trigger function.

var form = new FormData();
var fetch = require("node-fetch");
var https = require('https');
var httpAgents_ = new https.Agent({keepAlive: true});
httpAgents_.maxSockets = 200;

module.exports = async function (context, req) {
    context.log('JavaScript HTTP trigger function processed a request.');

   let form_ = getMultiData(context);

   const response = await getResponse(form_,context);

    context.res = { 
           body: response };
    context.done;
};

async function cerenceLookResponse(body_,context)
{
  context.log('calling http function')
   const url = "https://webhook.site/5c7950af-85fc-49b5-a677-12430805a159";
    return fetch(url, {
        method: 'POST',
        body: form,
        headers: {
            "Accept": "*/*",
            "Accept-Encoding": "gzip, deflate, br",
            "Connection":"Keep-Alive",
            "Content-Length":1330,
            "Keep-Alive": "timeout=30000",
            "Transfer-Encoding": "chunked",
        },
        agent: httpAgents_
        
        }).then(res => res.text());
};

function getMultiData(context){
    var content = { "cmdDict":{ "device": "iso", };
    var content2 ={"appserver_data": {"action_mode": "default",  },"enable_filtering": 1,  };
    var options = { header: {'content-type': "application/JSON; charset=utf-8"}};

    form.append('RequestData', JSON.stringify(content), options);
    form.append('DictParameter', JSON.stringify(content2), options);

    var ar = []
    for(var i=0;i<54;i++){
        ar.push(form._streams[3][i]); }
    var ar2 = []
    for(var i=0;i<52;i++){
        ar2.push(form._streams[3][i]);}
    boun = ar2.join("")
    test1_orig = ar.join("")
    test2 = "Content-Disposition: form-data; name=\"DictParameter\"; paramName=\"REQUEST_INFO\""
    test1 = test1_orig + test2 + "\r\n" +'content-type: application/JSON; charset=utf-8\r\n' + '\r\n',
    form._streams[3] = test1
    form._streams.push(boun + "--\r\n");
  
    return form;

};

This program perfectly fine when I work with a local WebStorm terminal. However, on Azure portal first time it gets the response from the web hook and then if I want to run once again right after I get the response. The function stall and after 3 min and throws an error "socket hang upStack: FetchError". What am I doing wrong here?

What is in the getResponse function? Also, why are you creating form variable in the global scope and not locally in getMultiData function? — krishg
– krishg, Commented Nov 23, 2020 at 16:02

krishg · Accepted Answer · 2020-11-23 16:06:54Z

1

You are creating form in the global scope. So every time you are calling the getMultiData function, duplicate stuffs getting added in the same FormData instance. Declare it locally inside getMultiData function.

answered Nov 23, 2020 at 16:06

krishg

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2 Comments

Daki Withanage Over a year ago

I have a question, if we declare a global variable in Azure function will it be reinitialize every time a http request call the function or it will be there as long as we clean the memory or restart the function ?

krishg Over a year ago

Azure Function would manage the instance creation. Hence it can reuse old instance at times when invoked.

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