lltrace-aws-sdk

Purpose

This is (almost) a drop-in replacement for aws-sdk to be used in AWS Lambda functions.

Some of the methods are monkey-patched to allow for the activity of lambda functions to be traced.

Usage

In your lambda, instead of this:

var aws = require('aws-sdk');

Do this:

var aws = require('lltrace-aws-sdk').AWS;

And then at the top of the handler function:

require('lltrace-aws-sdk').init(context.invokedFunctionArn);

All existing code making use of the aws object should continue working normally.

Requirements

• Create a DynamoDB table with the name lltrace with Primary Key set to:
  1. Partition key Caller of type String
  2. Sort key Target of type String
• Lambdas using this library need to be able to write to DynamoDB

Under the hood

SNS publish, Lambda invoke and S3 upload operations are traced at the moment.

The appropriate methods are monkey-patched to log the name of the lambda function and what it's doing to DynamoDB (only a subset of all operations are logged, 10% by default).

The entries in DynamoDB can then be used to create the map of the lambdas and how they communicate (SNS, direct invocations etc) and what triggers different lambdas (SNS, S3 events etc).