#Aws Lambda Handler

Returns a lambda handler that when invoked with a Sns/dynamodb event and lambda context object, it will invoke the eventHandler with a parsed json message and a node callback. The eventHandler callback is an async.each iterator function. Each Record in the Sns will invoke the eventHandler until complete. If eventHandler calls back with an error and there is an errorHandler defined it will call it with the error and the callback.

See https://www.npmjs.com/package/aws_message_reader for more info on message parsing.

#Example

  'use strict';

  require('dotenv').load();

  var lambdaHandler = require('aws_lambda_handler');
  var intercom = require('intercom_init');
  var errorHandler = require('./error_handler');

  exports.handler = lambdaHandler(function eventHandler(message, callback) {
      intercom.createEvent(event, callback);
  }, errorHandler);

Optional error handler.

  'use strict';
  var airbrake = require('airbrake').createClient("your api key");

  module.exports = function errorHandler(err, callback) {
    airbrake.notify(err, callback);
  };

    var snsEvent = {
      "Records":[
        {
          "EventSource":"aws:sns",
          "EventVersion": "1.0",
          "EventSubscriptionArn": "arn:aws:sns:us-east-1:123456789012:lambda_topic:0b6941c3-f04d-4d3e-a66d-b1df00e1e381",
          "Sns":{
            "Type": "Notification",
            "MessageId":"95df01b4-ee98-5cb9-9903-4c221d41eb5e",
        "TopicArn":"arn:aws:sns:us-east-1:123456789012:lambda_topic",
            "Subject":"TestInvoke",
        "Message":" SOME STRINGIFIED JSON ",
            "Timestamp":"2015-04-02T07:36:57.451Z",
        "SignatureVersion":"1",
        "Signature":"r0Dc5YVHuAglGcmZ9Q7SpFb2PuRDFmJNprJlAEEk8CzSq9Btu8U7dxOu++uU",
            "SigningCertUrl":"http://sns.us-east-1.amazonaws.com/SimpleNotificationService-d6d679a1d18e95c2f9ffcf11f4f9e198.pem",
        "UnsubscribeUrl":"http://cloudcast.amazon.com/?Action=Unsubscribe&SubscriptionArn=arn:aws:sns:us-east-1:123456789012:example_topic:0b6941c3-f04d-4d3e-a66d-b1df00e1e381",
        "MessageAttributes":{"key":{"Type":"String","Value":"value"}}
          }
        }
      ]
    };

    // Simulate an aws lambda invocation
    handler(snsEvent, {
      succeed: function() {
        // yeah!!
      },
      fail: function(err) {
        blowUp(err); // :(        
      }

    })