#!/usr/bin/python -tt
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.

DOCUMENTATION = '''
---
module: ec2
short_description: create an instance in ec2, return instanceid
description:
     - creates ec2 instances and optionally waits for it to be 'running'. This module has a dependency on the external I(euca2ools) package.
version_added: "0.9"
options:
  key_name:
    description:
      - key pair to use on the instance
    required: true
    default: null
    aliases: ['keypair']
  group:
    description:
      - security group to use on the instance
    required: false
    default: 'default'
    aliases: []
  instance_type:
    description:
      - instance type to use for the instance
    required: true
    default: null
    aliases: []
  image:
    description:
       - I(emi) (or I(ami)) to use for the instance
    required: true
    default: null
    aliases: []
  kernel:
    description:
      - kernel I(eki) to use for the instance
    required: false
    default: null
    aliases: []
  ramdisk:
    description:
      - ramdisk I(eri) to use for the instance
    required: false
    default: null
    aliases: []
  wait:
    description:
      - wait for the instance to be in state 'running' before returning
    required: False
    default: False
    aliases: []
  ec2_url:
    description:
      - url to use to connect to ec2 or your Eucalyptus cloud (for example (https://ec2.amazonaws.com) when using Amazon ec2 directly and not Eucalyptus)
    required: False
    default: null
    aliases: []
  ec2_secret_key:
    description:
      - ec2 secret key
    required: False
    default: null
    aliases: []
  ec2_access_key:
    description:
      - ec2 access key
    required: False
    default: null
    aliases: []
  count:
    description:
      - number of instances to launch
    required: False
    default: 1
    aliases: []
  user_data:
    version_added: "0.9"
    description:
      - opaque blob of data which is made available to the ec2 instance
    required: False
    default: null
    aliases: []
examples:
   - code: "local_action: ec2 keypair=admin instance_type=m1.large image=emi-40603AD1 wait=true group=webserver count=3"
     description: "Examples from Ansible Playbooks"
requirements: [ "boto" ]
author: Seth Vidal, Tim Gerla, Lester Wade
'''

import sys
import time

try:
    import boto 
except ImportError:
    print "failed=True msg='boto required for this module'"
    sys.exit(1)

def main():
    module = AnsibleModule(
        argument_spec = dict(
            key_name = dict(required=True, aliases = ['keypair']),
            group = dict(default='default'),
            instance_type = dict(aliases=['type']),
            image = dict(required=True),
            kernel = dict(),
            count = dict(default='1'), 
            ramdisk = dict(),
            wait = dict(choices=BOOLEANS, default=False),
            ec2_url = dict(aliases=['EC2_URL']),
            ec2_secret_key = dict(aliases=['EC2_SECRET_KEY']),
            ec2_access_key = dict(aliases=['EC2_ACCESS_KEY']),
            user_data = dict(),
        )
    )

    key_name = module.params.get('key_name')
    group = module.params.get('group')
    instance_type = module.params.get('instance_type')
    image = module.params.get('image')
    count = module.params.get('count') 
    kernel = module.params.get('kernel')
    ramdisk = module.params.get('ramdisk')
    wait = module.params.get('wait')
    ec2_url = module.params.get('ec2_url')
    ec2_secret_key = module.params.get('ec2_secret_key')
    ec2_access_key = module.params.get('ec2_access_key')
    user_data = module.params.get('user_data')
    
    # allow eucarc environment variables to be used if ansible vars aren't set
    if not ec2_url and 'EC2_URL' in os.environ:
        ec2_url = os.environ['EC2_URL']
    if not ec2_secret_key and 'EC2_SECRET_KEY' in os.environ:
        ec2_secret_key = os.environ['EC2_SECRET_KEY']
    if not ec2_access_key and 'EC2_ACCESS_KEY' in os.environ:
        ec2_access_key = os.environ['EC2_ACCESS_KEY']

    if ec2_url: # if we have an URL set, connect to the specified endpoint 
        ec2 = boto.connect_ec2_endpoint(ec2_url, ec2_access_key, ec2_secret_key)
    else: # otherwise it's Amazon.
        ec2 = boto.connect_ec2(ec2_access_key, ec2_secret_key)

# Note min_count is static in value. Since we aren't interested in addressing an autoscaling use-case. 
# Autoscaling means more instances are launched on a triggered event, so this is post-play/run stuff.
        
    try:
        res = ec2.run_instances(image, key_name = key_name,
                                min_count = 1, max_count = count,
                                security_groups = [group],
                                instance_type = instance_type,
                                kernel_id = kernel,
                                ramdisk_id = ramdisk,
                                user_data = user_data)
    except boto.exception.EC2ResponseError as e:
        module.fail_json(msg = "%s: %s" % (e.error_code, e.error_message))

    instids = [ i.id for i in res.instances ]

    res_list = res.connection.get_all_instances(instids)
    this_res = res_list[0]
    if wait:
        # wait here until the instances are up
        num_running = 0
        while num_running != len(instids):
            res_list = res.connection.get_all_instances(instids)
            this_res = res_list[0]
            num_running = len([ i for i in this_res.instances if i.state=='running' ])
            time.sleep(5)
    
    instances = []
    for inst in this_res.instances:
        d = {
           'id': inst.id,
           'public_ip': inst.ip_address,
           'public_dns_name': inst.public_dns_name
            }
        instances.append(d)

    result = {"changed": True,
              "instances": instances }
    module.exit_json(**result)

# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>

main()