DynamoDB, Lambda function / custom module Timeout - node.js

Question

I have the following two JS file. My problem is when i call the Calls.js which calls the Archive.js for archiving logs into DynamoDB the request times out.
I have tried out, many things, read about many things, tried in local/AWS environment without luck. What am i missing?
Link1, Link2, Link3, Link4, Link5,
Archive.js
module.exports.archive = archive;
...
function archive(input, callback){
AWS.config.update({
region: "eu-west-1",
endpoint: "http://localhost:8000"
});
var documentClient = new AWS.DynamoDB.DocumentClient({
httpOptions: {
agent: new https.Agent({
rejectUnauthorized: true,
secureProtocol: "TLSv1_method",
ciphers: "ALL"
})
}
});
...
var paramsPUT = {
TableName: "Logging",
Item: {
HashKey: dbID,
archiveEntry: archiveEntry
}
};
...
documentClient.put(paramsPUT, function(err, data) {
if (err) console.log(err);
if (data) console.log(data);
...
callback(data);
});
}
Calls.js
exports.handler(event, context, callback) => {
const archive = require("./..path..").archive;
...
context.callbackWaitsForEmptyEventLoop = false;
...
archive(input, callback);
...
}

Answer 1

I can not reproduce a timeout condition with your code. Your code is talking to an AWS endpoint at http://localhost:8000, so I assume you have DynamoDB local up and running, don't you ? Failling to have local DynamoDB running would cause the timeout.
That being said, I would strongly suggest to refactor your code to use Promise and the new async/await provided by NodeJS 8 instead of passing the Lambda callback around.
Here is the modified code.
const AWS = require("aws-sdk");
async function archive(input) {
return new Promise( (resolve, reject) => {
AWS.config.update({
region: "eu-west-1",
endpoint: 'http://localhost:8000'
});
//use client specific AWS configuration instead of the global one
const documentClient = new AWS.DynamoDB.DocumentClient();
var paramsPUT = {
TableName: "Logging",
Item: {
HashKey: "123",
archiveEntry: input
}
};
documentClient.put(paramsPUT, function (err, data) {
if (err) {
console.log("ERROR " + err);
reject(err);
}
console.log("Returned from DDB " + JSON.stringify(data, null,2));
resolve(data);
});
});
}
exports.handler = async (event, context, callback) => {
const result = await archive("abc");
callback(result);
}
// stuffs to test locally
callback = function (data) {
console.log("callback called with " + JSON.stringify(data,null,2));
}
event = context = {}
exports.handler(event, context, callback);