ECS task runner with Lambda

## ecs_task_runner.js

var AWS = require('aws-sdk')
var ecs = new AWS.ECS();

exports.handler = (events, context) => {
    // CLI example:
    // aws  --region ap-northeast-1 ecs run-task --task-definition my_task_def
    /* input event payload sample:

    {
       "ecs_task_def": "my_task_def",
       "region": "us-west-2",
       "cluster": "default",
       "count": 1
    }
    */

  console.log(events)
	var ecs_task_def = events.ecs_task_def || 'undefined'
	var exec_region  = events.region || 'ap-northeast-1'
	var cluster      = events.cluster || 'default'
	var count        = events.count || 1
  console.log(ecs_task_def, exec_region)
  var params = {
      taskDefinition: ecs_task_def,
      cluster: cluster,
      count: count
  }
  ecs.runTask(params, function(err, data) {
      if (err) console.log(err, err.stack); // an error occurred
      else     console.log(data);           // successful response
      context.done(err, data)
  })

}