Axios.all, how to configure axios wait time to mitigate hung up? - node.js

Question

My application uses an internal webservice for fetching data, i have a job which creates approx 500 requests which getsfired async to complete the fetch operation.
I make use of Axios, by creating an array of axios promises and then resolving them using using Axios.all();
It works fine until some 200 requests but post that i get socket hung up, however on the server side i see the requests are being processed.
How to configure axios to set custom time out, or is it a better idea to splice my promises array and then run them as multiple batches ?
Source code
let getAxiosPromiseArray = (urlList) => {
var axiosArrayofPromise = [];
return new Promise ( (resolve, reject) => {
try {
urlList.forEach ( (URL) => {
axiosArrayofPromise.push(axios.get(URL));
});
resolve(axiosArrayofPromise);
}
catch (err) {
reject("There is a problem getting Axios array of promises " + err);
}
})
}
async function processAxiosPromises (PromiseArray) {
try {
var results = []
results = await axios.all(PromiseArray);
return results;
}
catch(err) {
throw("There was a problem resolving promises array (Axios) " + err);
}
}
getallID().then ( (urlList) => {
return getAxiosPromiseArray(urlList);
}).then( (AxiosPromises) => {
return processAxiosPromises(AxiosPromises);
}).then ((resultData) => {
console.log(resultData);
});
Error
There was a problem resolving promises array (Axios) Error: socket hang up

Answer 1

First, that pair of functions getAxiosPromiseArray() and processAxiosPromises() needs fixing.
Your new Promise() construction is unnecessary. You can simply return Promise.all(arrayofPromise) (or axios.all(...) if you must) and do away with the other function.
Renaming the remaining function to something meaningful, you would end up with eg :
let getData = (urlList) => {
return Promise.all(urlList.map(URL => axios.get(URL)))
.catch(error => {
error.message = "There is a problem getting Axios array of promises " + error.message; // augment the error message ...
throw error; // ... and re-throw the errror.
});
};
And call as follows :
getallID().then(getData)
.then(resultData => {
console.log(resultData);
}).catch(error => {
console.error(error);
});
That will put you on solid ground but, on its own, is unlikely to fix a concurrency problem (if that's what it is), for which the simplest approach is to use Bluebird's Promise.map with the concurrency option.
The caller code can remain the same, just change getData(), as follows:
let getData = (urlList) => {
let concurrency = 10; // play with this value to find a reliable concurrency limit
return Promise.map(urlList, URL => axios.get(URL), {'concurrency': concurrency})
.catch(error => {
error.message = "There is a problem getting Axios array of promises " + error.message;
throw error;
});
};
// where `Promise` is Bluebird.

Answer 2

const axios = require('axios');
const axiosThrottle = require('axios-throttle');
//pass axios object and value of the delay between requests in ms
axiosThrottle.init(axios,200)
const options = {
method: 'GET',
};
const urlList = [
'https://jsonplaceholder.typicode.com/todos/1',
'https://jsonplaceholder.typicode.com/todos/2',
'https://jsonplaceholder.typicode.com/todos/3',
'https://jsonplaceholder.typicode.com/todos/4',
'https://jsonplaceholder.typicode.com/todos/5',
'https://jsonplaceholder.typicode.com/todos/6',
'https://jsonplaceholder.typicode.com/todos/7',
'https://jsonplaceholder.typicode.com/todos/8',
'https://jsonplaceholder.typicode.com/todos/9',
'https://jsonplaceholder.typicode.com/todos/10'
];
const promises = [];
const responseInterceptor = response => {
console.log(response.data);
return response;
};
//add interceptor to work with each response seperately when it is resolved
axios.interceptors.response.use(responseInterceptor, error => {
return Promise.reject(error);
});
for (let index = 0; index < urlList.length; index++) {
options.url = urlList[index];
promises.push(axiosThrottle.getRequestPromise(options, index));
}
//run when all promises are resolved
axios.all(promises).then(responses => {
console.log(responses.length);
});
https://github.com/arekgotfryd/axios-throttle