Tukukkk

I am making a parallel call like below.

let parllel_call: [Promise<any>, Promise<any>] = [

        Function1(xxxxReq),

        Function2(yyyyReq),

     ];

let parllel_call_result = await Promise.all(parllel_call);

console.log('parllel_call_result ', JSON.stringify(parllel_call_result));

let xxxxRes = parllel_call_result[0];

console.log('xxxxRes.status '+xxxxRes.status+' message '+xxxxRes.message+' message '+xxxxRes.data.message);

let yyyyRes = parllel_call_result[1];

console.log('yyyyRes.status '+yyyyRes.status+' message '+yyyyRes.message+' message '+yyyyRes.data.message);

Below is Function1.

async function Function1(xxxxReq) {

  console.log("Start - Function1");



  await axios

    .post(some_url, axxxxReq)

    .then(res => {



      console.log('response '+res.status+' message '+res.message);

      console.log("End - Function1");

      return res;

    })

    .catch(error => {

      console.error("error " + error);

      console.log("End - Function1");

      return error;

    });

}

Below is Function2.

async function Function2(yyyyReq) {

  console.log("Start - Function2");



  await axios

    .post(some_other_url, yyyyReq)

    .then(res => {

      console.log('response '+res.status+' message '+res.data.message);

      console.log("End - Function2");

      return res;

    })

    .catch(error => {

      console.error("error " + error);

      console.log("End - Function2");

      return error;

    });

}

I am able to invoke Function 1 & 2 parallelly and able to get the response within the functions.
But when the promises are resolved and responses are gathered in the order of how input is given, the response is not being collected from promises.
Log says null is passed into Promise.all response array.

Below is the log of execution.

info: Doing parllel call

Start - Function1

Start - Function2

info: response 200 message undefined

info: End - Function1

info: response 200 message undefined

info: End - Function2

parllel_call_result  [null,null]

error endAssesment TypeError: Cannot read property 'status' of undefined

info: Execution took 14323 ms, user function completed successfully

What I am missing here.

Your async functions don't return any value, therefore the promise they return will have an undefined resolved value. The return statements you do have are inside .then() or .catch() callbacks. You don't have any return at the top level that actually sets the resolved value of the async function. You need to return the value you get from the await or get rid of the await and just return the promise.

function Function2(yyyyReq) {

  console.log("Start - Function2");



  return axios

    .post(some_other_url, yyyyReq)

    .then(res => {

      console.log('response '+res.status+' message '+res.data.message);

      console.log("End - Function2");

      return res;

    })

    .catch(error => {

      console.error("error " + error);

      console.log("End - Function2");

      throw error;

    });

}

And, once you remove the await and just return the promise from the axios() call, you don't need your function to be async any more either.

In addition, if you want your .catch() to still reject the promise, then you need to rethrow the error.

If you wanted to keep the async/await, you would have to capture and return the value.

async function Function2(yyyyReq) {

  console.log("Start - Function2");



  let val = await axios

    .post(some_other_url, yyyyReq)

    .then(res => {

      console.log('response '+res.status+' message '+res.data.message);

      console.log("End - Function2");

      return res;

    })

    .catch(error => {

      console.error("error " + error);

      console.log("End - Function2");

      throw error;

    });

  return val;

}