#!/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
short_description: create or terminate an instance in ec2, return instanceid
description:
     - Creates or terminates ec2 instances. When created optionally waits for it to be 'running'. This module has a dependency on python-boto >= 2.5
version_added: "0.9"
options:
  key_name:
    description:
      - key pair to use on the instance
    required: true
    default: null
    aliases: ['keypair']
  id:
    description:
      - identifier for this instance or set of instances, so that the module will be idempotent with respect to EC2 instances.
    required: false
    default: null
    aliases: []
  group:
    description:
      - security group (or list of groups) to use with the instance
    required: false
    default: null
    aliases: [ 'groups' ]
  group_id:
    version_added: "1.1"
    description:
      - security group id to use with the instance
    required: false
    default: null
    aliases: []
  region:
    version_added: "1.2"
    description:
      - the EC2 region to use
    required: false
    default: null
    aliases: []
  zone:
    version_added: "1.2"
    description:
      - availability zone in which to launch the instance
    required: false
    default: null
    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: "no"
    choices: [ "yes", "no" ]
    aliases: []
  wait_timeout:
    description:
      - how long before wait gives up, in seconds
    default: 300
    aliases: []
  ec2_url:
    description:
      - url to use to connect to EC2 or your Eucalyptus cloud (by default the module will use EC2 endpoints)
    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: []
  monitor:
    version_added: "1.1"
    description:
      - enable detailed monitoring (CloudWatch) for instance
    required: false
    default: null
    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: []
  instance_tags:
    version_added: "1.0"
    description:
      - a hash/dictionary of tags to add to the new instance; '{"key":"value"}' and '{"key":"value","key":"value"}'
    required: false
    default: null
    aliases: []
  placement_group:
    version_added: "1.3"
    description:
      - placement group for the instance when using EC2 Clustered Compute
    required: false
    default: null
    aliases: []
  vpc_subnet_id:
    version_added: "1.1"
    description:
      - the subnet ID in which to launch the instance (VPC)
    required: false
    default: null
    aliases: []
  private_ip:
    version_added: "1.2"
    description:
      - the private ip address to assign the instance (from the vpc subnet)
    required: false
    defualt: null
    aliases: []
  instance_ids:
    version_added: "1.3"
    description:
      - list of instance ids, currently only used when state='absent'
    required: false
    default: null
    aliases: []
  state:
    version_added: "1.3"
    description:
      - create or terminate instances
    required: false
    default: 'present'
    aliases: []


requirements: [ "boto" ]
author: Seth Vidal, Tim Gerla, Lester Wade
'''

EXAMPLES = '''
# Basic provisioning example
- local_action:
    module: ec2
    keypair: mykey
    instance_type: c1.medium
    image: emi-40603AD1
    wait: yes
    group: webserver
    count: 3

# Advanced example with tagging and CloudWatch
- local_action:
    module: ec2
    keypair: mykey
    group: databases
    instance_type: m1.large
    image: ami-6e649707
    wait: yes
    wait_timeout: 500
    count: 5
    instance_tags: '{"db":"postgres"}' monitoring=yes'

# Multiple groups example
local_action:
    module: ec2
    keypair: mykey
    group: ['databases', 'internal-services', 'sshable', 'and-so-forth']
    instance_type: m1.large
    image: ami-6e649707
    wait: yes
    wait_timeout: 500
    count: 5
    instance_tags: '{"db":"postgres"}' monitoring=yes'

# VPC example
- local_action:
    module: ec2
    keypair: mykey
    group_id: sg-1dc53f72
    instance_type: m1.small
    image: ami-6e649707
    wait: yes
    vpc_subnet_id: subnet-29e63245'


# Launch instances, runs some tasks
# and then terminate them


- name: Create a sandbox instance
  hosts: localhost
  gather_facts: False
  vars:
    keypair: my_keypair
    instance_type: m1.small
    security_group: my_securitygroup
    image: my_ami_id
    region: us-east-1
  tasks:
    - name: Launch instance
      local_action: ec2 keypair={{ keypair }} group={{ security_group }} instance_type={{ instance_type }} image={{ image }} wait=true region={{ region }}
      register: ec2
    - name: Add new instance to host group
      local_action: add_host hostname={{ item.public_ip }} groupname=launched
      with_items: ec2.instances
    - name: Wait for SSH to come up
      local_action: wait_for host={{ item.public_dns_name }} port=22 delay=60 timeout=320 state=started
      with_items: ec2.instances

- name: Configure instance(s)
  hosts: launched
  sudo: True
  gather_facts: True
  roles:
    - my_awesome_role
    - my_awesome_test

- name: Terminate instances
  hosts: localhost
  connection: local
  tasks:
    - name: Terminate instances that were previously launched
      local_action:
        module: ec2
        state: 'absent'
        instance_ids: {{ec2.instance_ids}}

'''

import sys
import time

try:
    import boto.ec2
    from boto.exception import EC2ResponseError
except ImportError:
    print "failed=True msg='boto required for this module'"
    sys.exit(1)


def get_instance_info(inst):
    """
    Retrieves instance information from an instance
    ID and returns it as a dictionary
    """

    return({
        'id': inst.id,
        'ami_launch_index': inst.ami_launch_index,
        'private_ip': inst.private_ip_address,
        'private_dns_name': inst.private_dns_name,
        'public_ip': inst.ip_address,
        'dns_name': inst.dns_name,
        'public_dns_name': inst.public_dns_name,
        'state_code': inst.state_code,
        'architecture': inst.architecture,
        'image_id': inst.image_id,
        'key_name': inst.key_name,
        'virtualization_type': inst.virtualization_type,
        'placement': inst.placement,
        'kernel': inst.kernel,
        'ramdisk': inst.ramdisk,
        'launch_time': inst.launch_time,
        'instance_type': inst.instance_type,
        'root_device_type': inst.root_device_type,
        'root_device_name': inst.root_device_name,
        'state': inst.state,
        'hypervisor': inst.hypervisor
    })


def create_instances(module, ec2):
    """
    Creates new instances

    module : AnsbileModule object
    ec2: authenticated ec2 connection object

    Returns:
        A list of dictionaries with instance information
        about the instances that were launched
    """

    key_name = module.params.get('key_name')
    id = module.params.get('id')
    group_name = module.params.get('group')
    group_id = module.params.get('group_id')
    zone = module.params.get('zone')
    instance_type = module.params.get('instance_type')
    image = module.params.get('image')
    count = module.params.get('count')
    monitoring = module.params.get('monitoring')
    kernel = module.params.get('kernel')
    ramdisk = module.params.get('ramdisk')
    wait = module.params.get('wait')
    wait_timeout = int(module.params.get('wait_timeout'))
    placement_group = module.params.get('placement_group')
    user_data = module.params.get('user_data')
    instance_tags = module.params.get('instance_tags')
    vpc_subnet_id = module.params.get('vpc_subnet_id')
    private_ip = module.params.get('private_ip')


    # Here we try to lookup the group name from the security group id - if group_id is set.
    if group_id and group_name:
        module.fail_json(msg = str("Use only one type of parameter (group_name) or (group_id)"))
        sys.exit(1)

    try:
        # Here we try to lookup the group id from the security group name - if group is set.
        if group_name:
            grp_details = ec2.get_all_security_groups()
            if type(group_name) == list:
                group_id = list(filter(lambda grp: str(grp.id) if str(tmp) in str(grp) else None, grp_details) for tmp in group_name)
            elif type(group_name) == str:
                for grp in grp_details:
                    if str(group_name) in str(grp):
                        group_id = [str(grp.id)]
                group_name = [group_name]
        # Now we try to lookup the group id testing if group exists.
        elif group_id:
            grp_details = ec2.get_all_security_groups(group_ids=group_id)
            grp_item = grp_details[0]
            group_name = [grp_item.name]
    except boto.exception.NoAuthHandlerFound, e:
            module.fail_json(msg = str(e))

    # Lookup any instances that much our run id.

    running_instances = []
    count_remaining = int(count)

    if id != None:
        filter_dict = {'client-token':id, 'instance-state-name' : 'running'}
        previous_reservations = ec2.get_all_instances(None, filter_dict)
        for res in previous_reservations:
            for prev_instance in res.instances:
                running_instances.append(prev_instance)
        count_remaining = count_remaining - len(running_instances)

    # Both min_count and max_count equal count parameter. This means the launch request is explicit (we want count, or fail) in how many instances we want.

    if count_remaining > 0:
        try:
            params = {'image_id': image,
                      'key_name': key_name,
                      'client_token': id,
                      'min_count': count_remaining,
                      'max_count': count_remaining,
                      'monitoring_enabled': monitoring,
                      'placement': zone,
                      'placement_group': placement_group,
                      'instance_type': instance_type,
                      'kernel_id': kernel,
                      'ramdisk_id': ramdisk,
                      'subnet_id': vpc_subnet_id,
                      'private_ip_address': private_ip,
                      'user_data': user_data}

            if vpc_subnet_id:
                params['security_group_ids'] = group_id
            else:
                params['security_groups'] = group_name

            res = ec2.run_instances(**params)
        except boto.exception.BotoServerError, e:
            module.fail_json(msg = "%s: %s" % (e.error_code, e.error_message))

        instids = [ i.id for i in res.instances ]
        while True:
            try:
                res.connection.get_all_instances(instids)
                break
            except boto.exception.EC2ResponseError as e:
                if "<Code>InvalidInstanceID.NotFound</Code>" in str(e):
                    # there's a race between start and get an instance
                    continue
                else:
                    module.fail_json(msg = str(e))

        if instance_tags:
            try:
                ec2.create_tags(instids, module.from_json(instance_tags))
            except boto.exception.EC2ResponseError as e:
                module.fail_json(msg = "%s: %s" % (e.error_code, e.error_message))

        # wait here until the instances are up
        res_list = res.connection.get_all_instances(instids)
        this_res = res_list[0]
        num_running = 0
        wait_timeout = time.time() + wait_timeout
        while wait and wait_timeout > time.time() and 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)
        if wait and wait_timeout <= time.time():
            # waiting took too long
            module.fail_json(msg = "wait for instances running timeout on %s" % time.asctime())

        for inst in this_res.instances:
            running_instances.append(inst)

    instance_dict_array = []
    created_instance_ids = []
    for inst in running_instances:
        d = get_instance_info(inst)
        created_instance_ids.append(inst.id)
        instance_dict_array.append(d)

    return (instance_dict_array, created_instance_ids)


def terminate_instances(module, ec2, instance_ids):
    """
    Terminates a list of instances

    module: Ansible module object
    ec2: authenticated ec2 connection object
    termination_list: a list of instances to terminate in the form of
      [ {id: <inst-id>}, ..]

    Returns a dictionary of instance information
    about the instances terminated.

    If the instance to be terminated is running
    "changed" will be set to False.

    """

    changed = False
    instance_dict_array = []

    if not isinstance(instance_ids, list) or len(instance_ids) < 1:
        module.fail_json(msg='instance_ids should be a list of instances, aborting')

    terminated_instance_ids = []
    for res in ec2.get_all_instances(instance_ids):
        for inst in res.instances:
            if inst.state == 'running':
                terminated_instance_ids.append(inst.id)
                instance_dict_array.append(get_instance_info(inst))
                try:
                    ec2.terminate_instances([inst.id])
                except EC2ResponseError as e:
                    module.fail_json(msg='Unable to terminate instance {0}, error: {1}'.format(inst.id, e))
                changed = True

    return (changed, instance_dict_array, terminated_instance_ids)



def main():
    module = AnsibleModule(
        argument_spec = dict(
            key_name = dict(aliases = ['keypair']),
            id = dict(),
            group = dict(type='list'),
            group_id = dict(),
            region = dict(choices=['eu-west-1', 'sa-east-1', 'us-east-1', 'ap-northeast-1', 'us-west-2', 'us-west-1', 'ap-southeast-1', 'ap-southeast-2']),
            zone = dict(),
            instance_type = dict(aliases=['type']),
            image = dict(),
            kernel = dict(),
            count = dict(default='1'),
            monitoring = dict(choices=BOOLEANS, default=False),
            ramdisk = dict(),
            wait = dict(choices=BOOLEANS, default=False),
            wait_timeout = dict(default=300),
            ec2_url = dict(aliases=['EC2_URL']),
            ec2_secret_key = dict(aliases=['EC2_SECRET_KEY'], no_log=True),
            ec2_access_key = dict(aliases=['EC2_ACCESS_KEY']),
            placement_group = dict(),
            user_data = dict(),
            instance_tags = dict(),
            vpc_subnet_id = dict(),
            private_ip = dict(),
            instance_ids = dict(type='list'),
            state = dict(default='present'),
        )
    )

    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')
    region = module.params.get('region')
    termination_list = module.params.get('termination_list')


        # 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 we have a region specified, connect to its endpoint.
    if region:
        try:
            ec2 = boto.ec2.connect_to_region(region, aws_access_key_id=ec2_access_key, aws_secret_access_key=ec2_secret_key)
        except boto.exception.NoAuthHandlerFound, e:
            module.fail_json(msg = str(e))
    # Otherwise, no region so we fallback to the old connection method
    else:
        try:
            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)
        except boto.exception.NoAuthHandlerFound, e:
            module.fail_json(msg = str(e))

    if module.params.get('state') == 'absent':
        instance_ids = module.params.get('instance_ids')
        if not isinstance(instance_ids, list):
            module.fail_json(msg='termination_list needs to be a list of instances to terminate')

        (changed, instance_dict_array, new_instance_ids) = terminate_instances(module, ec2, instance_ids)

    elif module.params.get('state') == 'present':
        # Changed is always set to true when provisioning new instances
        changed = True
        if not module.params.get('key_name'):
            module.fail_json(msg='key_name parameter is required for new instance')
        if not module.params.get('image'):
            module.fail_json(msg='image parameter is required for new instance')
        (instance_dict_array, new_instance_ids) = create_instances(module, ec2)

    module.exit_json(changed=True, instance_ids=new_instance_ids, instances=instance_dict_array)


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

main()