Socket Hangup error in Nodejs for multiple API calls - node.js

Question

I am trying to fetch a list of all companies listed in stock market from an external API, and after getting the list, I am trying to fetch all details regarding individual companies including graph data. It was all working fine. However, today I am getting socket hangup error. I have tried going through other posts here in stackoverflow. However, none of them works.
const request = require('request');
const fetchAPI = apiPath => {
return new Promise(function (resolve, reject) {
request(apiPath, function (error, response, body) {
if (!error && response.statusCode == 200) {
resolve(body);
} else {
reject(error);
}
});
});
}
// get list of all companies listed in
const fetchCompanyDetails = () => {
return new Promise(function (resolve, reject) {
let details = [];
fetchAPI('https://api//')
.then(res => {
res = JSON.parse(res)
details.push(res);
resolve(details);
})
.catch(err => {
console.log("error at fetchcompany details" + err);
})
});
}
const getDateAndPriceForGraphData = (graphData) => {
let res = []
graphData.forEach(data => {
let d = {}
d["x"] = new Date(data.businessDate).getTime() / 1000
d["y"] = data.lastTradedPrice
res.push(d)
})
return res
}
// get graph data for individual assets
const getGraphDataForAssets = (assetID) => {
return new Promise((resolve, reject) => {
let details = {};
fetchAPI(`https://api/${assetID}`)
.then(async (res) => {
res = JSON.parse(res)
let data = await getDateAndPriceForGraphData(res)
details = data
resolve(details);
})
.catch(err => {
console.log("error at getGraphDataForAssets" + err);
})
});
}
// fetch data about individual assets
const fetchAssetDetailsOfIndividualCompanies = (assetID) => {
return new Promise((resolve, reject) => {
let details = {"assetData" : {}, "graphData": {}};
fetchAPI(`https://api/${assetID}`)
.then(async (res1) => {
res1 = JSON.parse(res1)
details["assetData"] = res1
// get graph data
var graphData = await getGraphDataForAssets(assetID)
details["graphData"] = graphData
resolve(details);
})
.catch(err => {
console.log("error at fetchAssetDetailsOfIndividualCompanies" + err);
reject(err)
})
});
}
// returns list of details of all tradeable assets (Active and Suspended but not delisted)
const fetchDetailsForEachCompany = async (companyList) => {
let result = []
await Promise.all(companyList.map(async (company) => {
try {
// return data for active and suspended assets
if(company.status != "D") {
let companyData = await fetchAssetDetailsOfIndividualCompanies(company.id)
result.push(companyData)
}
} catch (error) {
console.log('error at fetchDetailsForEachCompany'+ error);
}
}))
return result
}
exports.fetchAssetDetails = async () => {
let companyDetails = await fetchCompanyDetails()
let det = await fetchDetailsForEachCompany(companyDetails[0])
return det
}

Answer 1

To expand on what I meant with not needing those new Promise()s, this would be an idiomatic async function refactoring for the above code.
I eliminated getGraphDataForAssets, since it was eventually not used; fetchAssetDetailsOfIndividualCompanies fetched the same data (based on URL, anyway), and then had getGraphDataForAssets fetch it again.
const request = require("request");
function fetchAPI(apiPath) {
return new Promise(function (resolve, reject) {
request(apiPath, function (error, response, body) {
if (!error && response.statusCode === 200) {
resolve(body);
} else {
reject(error);
}
});
});
}
async function fetchJSON(url) {
return JSON.parse(await fetchAPI(url));
}
async function fetchCompanyDetails() {
return [await fetchAPI("https://api//")];
}
function getDateAndPriceForGraphData(graphData) {
return graphData.map((data) => ({
x: new Date(data.businessDate).getTime() / 1000,
y: data.lastTradedPrice,
}));
}
// fetch data about individual assets
async function fetchAssetDetailsOfIndividualCompanies(assetID) {
const assetData = await fetchJSON(`https://api/${assetID}`);
const graphData = getDateAndPriceForGraphData(assetData);
return { assetID, assetData, graphData };
}
// returns list of details of all tradeable assets (Active and Suspended but not delisted)
async function fetchDetailsForEachCompany(companyList) {
const promises = companyList.map(async (company) => {
if (company.status === "D") return null;
return fetchAssetDetailsOfIndividualCompanies(company.id);
});
const results = await Promise.all(promises);
return results.filter(Boolean); // drop nulls
}
async function fetchAssetDetails() {
const companyDetails = await fetchCompanyDetails();
return await fetchDetailsForEachCompany(companyDetails[0]);
}
exports.fetchAssetDetails = fetchAssetDetails;