#!/usr/bin/python
# -*- coding: utf-8 -*-

# (c) 2013, Matt Hite <mhite@hotmail.com>
#
# 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: bigip_pool_member
short_description: "Manages F5 BIG-IP LTM pool members"
description:
    - "Manages F5 BIG-IP LTM pool members via iControl SOAP API"
version_added: "1.4"
author: Matt Hite
notes:
    - "Requires BIG-IP software version >= 11"
    - "F5 developed module 'bigsuds' required (see http://devcentral.f5.com)"
    - "Best run as a local_action in your playbook"
    - "Supersedes bigip_pool for managing pool members"

requirements:
    - bigsuds
options:
    server:
        description:
            - BIG-IP host
        required: true
        default: null
        choices: []
        aliases: []
    user:
        description:
            - BIG-IP username
        required: true
        default: null
        choices: []
        aliases: []
    password:
        description:
            - BIG-IP password
        required: true
        default: null
        choices: []
        aliases: []
    validate_certs:
        description:
            - If C(no), SSL certificates will not be validated. This should only be used
              on personally controlled sites using self-signed certificates.
        required: false
        default: 'yes'
        choices: ['yes', 'no']
        version_added: 1.9.1
    state:
        description:
            - Pool member state
        required: true
        default: present
        choices: ['present', 'absent']
        aliases: []
    pool:
        description:
            - Pool name. This pool must exist.
        required: true
        default: null
        choices: []
        aliases: []
    partition:
        description:
            - Partition
        required: false
        default: 'Common'
        choices: []
        aliases: []
    host:
        description:
            - Pool member IP
        required: true
        default: null
        choices: []
        aliases: ['address', 'name']
    port:
        description:
            - Pool member port
        required: true
        default: null
        choices: []
        aliases: []
    connection_limit:
        description:
            - Pool member connection limit. Setting this to 0 disables the limit.
        required: false
        default: null
        choices: []
        aliases: []
    description:
        description:
            - Pool member description
        required: false
        default: null
        choices: []
        aliases: []
    rate_limit:
        description:
            - Pool member rate limit (connections-per-second). Setting this to 0 disables the limit.
        required: false
        default: null
        choices: []
        aliases: []
    ratio:
        description:
            - Pool member ratio weight. Valid values range from 1 through 100. New pool members -- unless overriden with this value -- default to 1.
        required: false
        default: null
        choices: []
        aliases: []
'''

EXAMPLES = '''

## playbook task examples:

---
# file bigip-test.yml
# ...
- hosts: bigip-test
  tasks:
  - name: Add pool member
    local_action: >
      bigip_pool_member
      server=lb.mydomain.com
      user=admin
      password=mysecret
      state=present
      pool=matthite-pool
      partition=matthite
      host="{{ ansible_default_ipv4["address"] }}"
      port=80
      description="web server"
      connection_limit=100
      rate_limit=50
      ratio=2

  - name: Modify pool member ratio and description
    local_action: >
      bigip_pool_member
      server=lb.mydomain.com
      user=admin
      password=mysecret
      state=present
      pool=matthite-pool
      partition=matthite
      host="{{ ansible_default_ipv4["address"] }}"
      port=80
      ratio=1
      description="nginx server"

  - name: Remove pool member from pool
    local_action: >
      bigip_pool_member
      server=lb.mydomain.com
      user=admin
      password=mysecret
      state=absent
      pool=matthite-pool
      partition=matthite
      host="{{ ansible_default_ipv4["address"] }}"
      port=80

'''

try:
    import bigsuds
except ImportError:
    bigsuds_found = False
else:
    bigsuds_found = True

# ===========================================
# bigip_pool_member module specific support methods.
#

def bigip_api(bigip, user, password):
    api = bigsuds.BIGIP(hostname=bigip, username=user, password=password)
    return api

def disable_ssl_cert_validation():
    # You probably only want to do this for testing and never in production.
    # From https://www.python.org/dev/peps/pep-0476/#id29
    import ssl
    ssl._create_default_https_context = ssl._create_unverified_context

def pool_exists(api, pool):
    # hack to determine if pool exists
    result = False
    try:
        api.LocalLB.Pool.get_object_status(pool_names=[pool])
        result = True
    except bigsuds.OperationFailed, e:
        if "was not found" in str(e):
            result = False
        else:
            # genuine exception
            raise
    return result

def member_exists(api, pool, address, port):
    # hack to determine if member exists
    result = False
    try:
        members = [{'address': address, 'port': port}]
        api.LocalLB.Pool.get_member_object_status(pool_names=[pool],
                                                  members=[members])
        result = True
    except bigsuds.OperationFailed, e:
        if "was not found" in str(e):
            result = False
        else:
            # genuine exception
            raise
    return result

def delete_node_address(api, address):
    result = False
    try:
        api.LocalLB.NodeAddressV2.delete_node_address(nodes=[address])
        result = True
    except bigsuds.OperationFailed, e:
        if "is referenced by a member of pool" in str(e):
            result = False
        else:
            # genuine exception
            raise
    return result

def remove_pool_member(api, pool, address, port):
    members = [{'address': address, 'port': port}]
    api.LocalLB.Pool.remove_member_v2(pool_names=[pool], members=[members])

def add_pool_member(api, pool, address, port):
    members = [{'address': address, 'port': port}]
    api.LocalLB.Pool.add_member_v2(pool_names=[pool], members=[members])

def get_connection_limit(api, pool, address, port):
    members = [{'address': address, 'port': port}]
    result = api.LocalLB.Pool.get_member_connection_limit(pool_names=[pool], members=[members])[0][0]
    return result

def set_connection_limit(api, pool, address, port, limit):
    members = [{'address': address, 'port': port}]
    api.LocalLB.Pool.set_member_connection_limit(pool_names=[pool], members=[members], limits=[[limit]])

def get_description(api, pool, address, port):
    members = [{'address': address, 'port': port}]
    result = api.LocalLB.Pool.get_member_description(pool_names=[pool], members=[members])[0][0]
    return result

def set_description(api, pool, address, port, description):
    members = [{'address': address, 'port': port}]
    api.LocalLB.Pool.set_member_description(pool_names=[pool], members=[members], descriptions=[[description]])

def get_rate_limit(api, pool, address, port):
    members = [{'address': address, 'port': port}]
    result = api.LocalLB.Pool.get_member_rate_limit(pool_names=[pool], members=[members])[0][0]
    return result

def set_rate_limit(api, pool, address, port, limit):
    members = [{'address': address, 'port': port}]
    api.LocalLB.Pool.set_member_rate_limit(pool_names=[pool], members=[members], limits=[[limit]])

def get_ratio(api, pool, address, port):
    members = [{'address': address, 'port': port}]
    result = api.LocalLB.Pool.get_member_ratio(pool_names=[pool], members=[members])[0][0]
    return result

def set_ratio(api, pool, address, port, ratio):
    members = [{'address': address, 'port': port}]
    api.LocalLB.Pool.set_member_ratio(pool_names=[pool], members=[members], ratios=[[ratio]])

def main():
    module = AnsibleModule(
        argument_spec = dict(
            server = dict(type='str', required=True),
            user = dict(type='str', required=True),
            password = dict(type='str', required=True),
            validate_certs = dict(default='yes', type='bool'),
            state = dict(type='str', default='present', choices=['present', 'absent']),
            pool = dict(type='str', required=True),
            partition = dict(type='str', default='Common'),
            host = dict(type='str', required=True, aliases=['address', 'name']),
            port = dict(type='int', required=True),
            connection_limit = dict(type='int'),
            description = dict(type='str'),
            rate_limit = dict(type='int'),
            ratio = dict(type='int')
        ),
        supports_check_mode=True
    )

    if not bigsuds_found:
        module.fail_json(msg="the python bigsuds module is required")

    server = module.params['server']
    user = module.params['user']
    password = module.params['password']
    validate_certs = module.params['validate_certs']
    state = module.params['state']
    partition = module.params['partition']
    pool = "/%s/%s" % (partition, module.params['pool'])
    connection_limit = module.params['connection_limit']
    description = module.params['description']
    rate_limit = module.params['rate_limit']
    ratio = module.params['ratio']
    host = module.params['host']
    address = "/%s/%s" % (partition, host)
    port = module.params['port']

    if not validate_certs:
        disable_ssl_cert_validation()

    # sanity check user supplied values

    if (host and not port) or (port and not host):
        module.fail_json(msg="both host and port must be supplied")

    if 1 > port > 65535:
        module.fail_json(msg="valid ports must be in range 1 - 65535")

    try:
        api = bigip_api(server, user, password)
        if not pool_exists(api, pool):
            module.fail_json(msg="pool %s does not exist" % pool)
        result = {'changed': False}  # default

        if state == 'absent':
            if member_exists(api, pool, address, port):
                if not module.check_mode:
                    remove_pool_member(api, pool, address, port)
                    deleted = delete_node_address(api, address)
                    result = {'changed': True, 'deleted': deleted}
                else:
                    result = {'changed': True}

        elif state == 'present':
            if not member_exists(api, pool, address, port):
                if not module.check_mode:
                    add_pool_member(api, pool, address, port)
                    if connection_limit is not None:
                        set_connection_limit(api, pool, address, port, connection_limit)
                    if description is not None:
                        set_description(api, pool, address, port, description)
                    if rate_limit is not None:
                        set_rate_limit(api, pool, address, port, rate_limit)
                    if ratio is not None:
                        set_ratio(api, pool, address, port, ratio)
                result = {'changed': True}
            else:
                # pool member exists -- potentially modify attributes
                if connection_limit is not None and connection_limit != get_connection_limit(api, pool, address, port):
                    if not module.check_mode:
                        set_connection_limit(api, pool, address, port, connection_limit)
                    result = {'changed': True}
                if description is not None and description != get_description(api, pool, address, port):
                    if not module.check_mode:
                        set_description(api, pool, address, port, description)
                    result = {'changed': True}
                if rate_limit is not None and rate_limit != get_rate_limit(api, pool, address, port):
                    if not module.check_mode:
                        set_rate_limit(api, pool, address, port, rate_limit)
                    result = {'changed': True}
                if ratio is not None and ratio != get_ratio(api, pool, address, port):
                    if not module.check_mode:
                        set_ratio(api, pool, address, port, ratio)
                    result = {'changed': True}

    except Exception, e:
        module.fail_json(msg="received exception: %s" % e)

    module.exit_json(**result)

# import module snippets
from ansible.module_utils.basic import *
main()