Node.js REQUEST throwing ECONNREFUSED after a few attempts

Question

I am using the below code:

async function validateMOData(data, callback) {
    success('Validation started');
    let a = 0;
    let i = data.length;
    console.log('length of array', i);
    while (i--) {
        a = a + 1;
        console.log('Loop Count', a);
        console.log(data[i]);
        let result;
        try {
            result = await checkValidity(data[i]);
            if ((JSON.parse(result.body)).isValid === false) {
                createErrorLog(data[i].MemberId, data[i].MemberAgreementId, (JSON.parse(result.body)).responseMessage, (JSON.parse(result.body)).responseCode, 'x', data[i].CsvFileName)
                deleteFaultyData(data[i].Id);
                data.splice(i, 1);
            }
        } catch (err) {
            console.log(err);
        }
    }
    success('validation ended');
    callback(data);
}
function checkValidity(record) {
    return new Promise((resolve, reject) => {
        let validityCheckUrl = `${constants.USER_INTERFACE.SERVER_URL_PREFIX}validateMemberData/?memberId=${record.MemberId}&memberAgreementId=${record.MemberAgreementId}`;
        request({ url: validityCheckUrl, pool: { maxSockets: 10 } }, (error, response, body) => {
            if (error) {
                reject(error);
            } else {
                resolve(response, body);
            }
        });
    });

}

After a few iterations in the while loop, the checkValidity method starts to throw the below error :

{ Error: connect ECONNREFUSED IP:port
at Object._errnoException (util.js:1022:11)
at _exceptionWithHostPort (util.js:1044:20)
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1198:14)
code: 'ECONNREFUSED',
errno: 'ECONNREFUSED',
syscall: 'connect',
address: 'IP',
port: port }

This error does not come in the first request but after a few requests. Can anyone help? Am i missing anything?

NOte: This code run on AWS lambda and checkValidity connects to a Node.js server deployed on EC2

What's the length of the array you're looking over; how many requests get processed before it fails? — Paul, Jan 25 '19 at 12:17
Can you add time info? How many requests per second are you sending? — Paul, Jan 25 '19 at 14:39

score 0 · Answer 1 · answered Jan 25 '19 at 12:22

What i thinks is you did not placed a check to check that is the i is in negative or in simple words no break condition here inside try

try {
      ***********************
        result = await checkValidity(data[i]);
        if ((JSON.parse(result.body)).isValid === false) {
            createErrorLog(data[i].MemberId, data[i].MemberAgreementId, (JSON.parse(result.body)).responseMessage, (JSON.parse(result.body)).responseCode, 'x', data[i].CsvFileName)
            deleteFaultyData(data[i].Id);
            data.splice(i, 1);
        }
    } catch (err) {
        console.log(err);
    }

So the loop would trying to send the data inside the checkvalidity that is even not present so most probably it is sending error

Data is present and it is failing at valid data. It is related to connection being refused, not invalid data — writeToBhuwan, Jan 25 '19 at 12:28

Node.js REQUEST throwing ECONNREFUSED after a few attempts

1 Answers1