In my AWS Lambda Node.js code, I've following code that calls the post method to index a document to AWS Elasticsearch service:
var endpoint = 'ABC-XYZ.us-east-1.es.amazonaws.com';
exports.handler = function(input, context) {
...
// post documents to the Amazon Elasticsearch Service
post(endpoint, elasticsearchBulkData, function(error, success, statusCode, failedItems) {
if (error) {
console.log('...');
if (failedItems && failedItems.length > 0) {
console.log(...);
}
// NOTE: Instead of failing, we are forcing a success, as we do not want retries
context.succeed('Success');
} else {
// console.log('Success: ' + JSON.stringify(success));
context.succeed('Success');
}
});
}
...
...
function post(endpoint, body, callback, lastTimeout) {
lastTimeout || (lastTimeout = 500);
var requestParams = buildRequest(endpoint, body);
var request = https.request(requestParams, function(response) {
var responseBody = '';
response.on('data', function(chunk) {
responseBody += chunk;
});
response.on('end', function() {
var info = JSON.parse(responseBody);
var failedItems;
var success;
if (response.statusCode >= 200 && response.statusCode < 299) {
failedItems = info.items.filter(function(x) {
return x.index.status >= 300;
});
success = { ...};
}
var error = response.statusCode !== 200 || info.errors === true ? {
"statusCode": response.statusCode,
"responseBody": responseBody
} : null;
callback(error, success, response.statusCode, failedItems);
});
}).on('error', function(e) {
console.error(e.stack || e);
//callback(e);
lastTimeout *= 2;
console.log('lastTimeout: ' + lastTimeout + " for cluster: " + endpoint) ;
setTimeout(function() {
post(endpoint, body, callback, lastTimeout);
}, lastTimeout);
});
request.end(requestParams.body);
}
...
At times I get Error: socket hang up ECONNRESET.
My question is: What would be the best way to catch this error and retry?
I added the setTimeout snippet based on this answer and it looks like it does work but I'm not sure if that's the right way to do.
Node.js version is 4.3.
I was thinking of using Promise with resolve and reject but being a JS Newbie, I'm not sure how to make use of promise in my post call.
I also went through this link but not clear on how can I wrap my post call with fetch_retry
