locally test lambda script

invoke.js

var fs = require('fs');

if(process.argv.length == 3)
{
  if(process.argv[2].match(/\.json$/))
  {
    try{
      var event = JSON.parse(fs.readFileSync(process.argv[2], 'utf8'));
    } catch(e) {
      console.log("could not parse JSON from file: "+process.argv[2]);
      return 1;
    }
  }
  else
  {
    try{
      var event = JSON.parse(process.argv[2]);
    } catch(e) {
      console.log("could not parse parameter as JSON string. : "+process.argv[2]);
      return 1;
    }
  }
}
else
{
  console.log('usage: node invoke.js input.json');
  console.log("       node invoke.js '{\"key1\":\"1\",\"key2\":\"2\",\"key3\":\"3\"}'");
  return 0;
}

var Context=function(){
  this.done=function(flag,msg){
    if(flag == null)
    {
      console.log("SUCCESS",msg);
    }
    else
    {
      console.log("FAILURE",null,msg);
    }
  };
};

var app=require('./app.js');
app.handler(event,new Context());

usage

~/work/lambda$ cat app.js
console.log('Loading event');

exports.handler = function(event, context) {
  console.log('key1:' + event.key1);
  console.log('key2:' + event.key2);
  console.log('key3:' + event.key3);
  setTimeout(function(){
    context.done(null, 'Hello World');  // SUCCESS with message
  },1000);
  return;
};
~/work/lambda$ cat input.json
{
  "key1":"1",
  "key2":"2",
  "key3":"3"
}
~/work/lambda$ node invoke.js input.json
Loading event
key1:1
key2:2
key3:3
SUCCESS Hello World
~/work/lambda$ node invoke.js '{"key1":"1","key2":"2","key3":"3"}'
Loading event
key1:1
key2:2
key3:3
SUCCESS Hello World