#!/usr/bin/python
# 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_snapshot
short_description: creates a snapshot from an existing volume
description:
    - creates an EC2 snapshot from an existing EBS volume
version_added: "1.5"
options:
  ec2_secret_key:
    description:
      - AWS secret key. If not set then the value of the AWS_SECRET_KEY environment variable is used. 
    required: false
    default: None
    aliases: ['aws_secret_key', 'secret_key' ]
  ec2_access_key:
    description:
      - AWS access key. If not set then the value of the AWS_ACCESS_KEY environment variable is used.
    required: false
    default: None
    aliases: ['aws_access_key', 'access_key' ]
  ec2_url:
    description:
      - Url to use to connect to EC2 or your Eucalyptus cloud (by default the module will use EC2 endpoints).  Must be specified if region is not used. If not set then the value of the EC2_URL environment variable, if any, is used
    required: false
    default: null
    aliases: []
  region:
    description:
      - The AWS region to use. If not specified then the value of the EC2_REGION environment variable, if any, is used.
    required: false
    default: null
    aliases: ['aws_region', 'ec2_region']
  volume_id:
    description:
      - volume from which to take the snapshot
    required: false
    default: null
    aliases: []
  description:
    description:
      - description to be applied to the snapshot
    required: false
    default: null
    aliases: []
  instance_id:
    description: 
    - instance that has a the required volume to snapshot mounted
    required: false
    default: null
    aliases: []
  device_name:
    description: 
    - device name of a mounted volume to be snapshotted
    required: false
    default: null
    aliases: []
requirements: [ "boto" ]
author: Will Thames
'''

EXAMPLES = '''
# Simple snapshot of volume using volume_id
- local_action: 
    module: ec2_snapshot 
    volume_id: vol-abcdef12   
    description: snapshot of /data from DB123 taken 2013/11/28 12:18:32

# Snapshot of volume mounted on device_name attached to instance_id
- local_action: 
    module: ec2_snapshot 
    instance_id: i-12345678
    device_name: /dev/sdb1
    description: snapshot of /data from DB123 taken 2013/11/28 12:18:32
'''    

import sys
import time

try:
    import boto.ec2
except ImportError:
    print "failed=True msg='boto required for this module'"
    sys.exit(1)

def main():
    module = AnsibleModule(
        argument_spec = dict(
            volume_id = dict(),
            description = dict(),
            instance_id = dict(),
            device_name = dict(),
            region = dict(aliases=['aws_region', 'ec2_region'], choices=AWS_REGIONS),
            ec2_url = dict(),
            ec2_secret_key = dict(aliases=['aws_secret_key', 'secret_key'], no_log=True),
            ec2_access_key = dict(aliases=['aws_access_key', 'access_key']),
        )
    )

    volume_id = module.params.get('volume_id')
    description = module.params.get('description')
    instance_id = module.params.get('instance_id')
    device_name = module.params.get('device_name')

    if not volume_id and not instance_id or volume_id and instance_id:
        module.fail_json('One and only one of volume_id or instance_id must be specified')
    if instance_id and not device_name or device_name and not instance_id:
        module.fail_json('Instance ID and device name must both be specified')

    ec2 = ec2_connect(module)

    if instance_id:
        try:
            volumes = ec2.get_all_volumes(filters={'attachment.instance-id': instance_id, 'attachment.device': device_name})
            if not volumes:
                module.fail_json(msg="Could not find volume with name %s attached to instance %s" % (device_name, instance_id))
            volume_id = volumes[0].id
        except boto.exception.BotoServerError, e:
            module.fail_json(msg = "%s: %s" % (e.error_code, e.error_message))

    try:
        snapshot = ec2.create_snapshot(volume_id, description=description)
    except boto.exception.BotoServerError, e:
        module.fail_json(msg = "%s: %s" % (e.error_code, e.error_message))

    module.exit_json(changed=True, snapshot_id=snapshot.id)

# import module snippets
from ansible.module_utils.basic import *
from ansible.module_utils.ec2 import *

main()
