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

# (c) 2016, Hiroaki Nakamura <hnakamur@gmail.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: lxd_container
short_description: Manage LXD Containers
version_added: 2.2.0
description:
  - Management of LXD containers
author: "Hiroaki Nakamura (@hnakamur)"
options:
    name:
        description:
          - Name of a container.
        required: true
    type:
        choices:
          - container
          - profile
        description:
          - The resource type.
        required: false
        default: container
    architecture:
        description:
          - The archiecture for the container (e.g. "x86_64" or "i686").
            See https://github.com/lxc/lxd/blob/master/doc/rest-api.md#post-1
        required: false
    config:
        description:
          - >
            The config for the container (e.g. {"limits.cpu": "2"}).
            See https://github.com/lxc/lxd/blob/master/doc/rest-api.md#post-1
          - If the container already exists and its "config" value in metadata
            obtained from
            GET /1.0/containers/<name>
            https://github.com/lxc/lxd/blob/master/doc/rest-api.md#10containersname
            are different, they this module tries to apply the configurations.
          - The key starts with 'volatile.' are ignored for this comparison.
          - Not all config values are supported to apply the existing container.
            Maybe you need to delete and recreate a container.
        required: false
    devices:
        description:
          - >
            The devices for the container
            (e.g. { "rootfs": { "path": "/dev/kvm", "type": "unix-char" }).
            See https://github.com/lxc/lxd/blob/master/doc/rest-api.md#post-1
        required: false
    ephemeral:
        description:
          - Whether or not the container is ephemeral (e.g. true or false).
            See https://github.com/lxc/lxd/blob/master/doc/rest-api.md#post-1
        required: false
    source:
        description:
          - >
            The source for the container
            (e.g. { "type": "image",
                    "mode": "pull",
                    "server": "https://images.linuxcontainers.org",
                    "protocol": "lxd",
                    "alias": "ubuntu/xenial/amd64" }).
            See https://github.com/lxc/lxd/blob/master/doc/rest-api.md#post-1
        required: false
    new_name:
        description:
          - A new name of a profile.
          - If this parameter is specified a profile will be renamed to this name.
        required: false
    state:
        choices:
          - present
          - started
          - stopped
          - restarted
          - absent
          - frozen
        description:
          - Define the state of a container or profile.
          - Valid choices for type=container are started, stopped, restarted,
            absent, or frozen.
          - Valid choices for type=profile are present or absent.
        required: false
        default: started
    timeout:
        description:
          - A timeout of one LXC REST API call.
          - This is also used as a timeout for waiting until IPv4 addresses
            are set to the all network interfaces in the container after
            starting or restarting.
        required: false
        default: 30
    wait_for_ipv4_addresses:
        description:
          - If this is true, the lxd_module waits until IPv4 addresses
            are set to the all network interfaces in the container after
            starting or restarting.
        required: false
        default: false
    force_stop:
        description:
          - If this is true, the lxd_module forces to stop the container
            when it stops or restarts the container.
        required: false
        default: false
    unix_socket_path:
        description:
          - The unix domain socket path for the LXD server.
        required: false
        default: /var/lib/lxd/unix.socket
    url:
        description:
          - The https URL for the LXD server.
          - If url is set, this module connects to the LXD server via https.
            If url it not set, this module connects to the LXD server via
            unix domain socket specified with unix_socket_path.
    key_file:
        description:
          - The client certificate key file path.
        required: false
        default: >
          '{}/.config/lxc/client.key'.format(os.environ['HOME'])
    cert_file:
        description:
          - The client certificate file path.
        required: false
        default: >
          '{}/.config/lxc/client.crt'.format(os.environ['HOME'])
    trust_password:
        description:
          - The client trusted password.
          - You need to set this password on the LXD server before
            running this module using the following command.
            lxc config set core.trust_password <some random password>
            See https://www.stgraber.org/2016/04/18/lxd-api-direct-interaction/
          - If trust_password is set, this module send a request for
            authentication before sending any requests.
        required: false
notes:
  - Containers must have a unique name. If you attempt to create a container
    with a name that already existed in the users namespace the module will
    simply return as "unchanged".
  - There are two ways to can run commands in containers, using the command
    module or using the ansible lxd connection plugin bundled in Ansible >=
    2.1, the later requires python to be installed in the container which can
    be done with the command module.
  - You can copy a file from the host to the container
    with the Ansible `copy` and `template` module and the `lxd` connection plugin.
    See the example below.
  - You can copy a file in the creatd container to the localhost
    with `command=lxc file pull container_name/dir/filename filename`.
    See the first example below.
"""

EXAMPLES = """
- hosts: localhost
  connection: local
  tasks:
    - name: Create a started container
      lxd_container:
        name: mycontainer
        state: started
        source:
          type: image
          mode: pull
          server: https://images.linuxcontainers.org
          protocol: lxd
          alias: "ubuntu/xenial/amd64"
        profiles: ["default"]
    - name: Install python in the created container "mycontainer"
      command: lxc exec mycontainer -- apt install -y python
    - name: Copy /etc/hosts in the created container "mycontainer" to localhost with name "mycontainer-hosts"
      command: lxc file pull mycontainer/etc/hosts mycontainer-hosts


# Note your container must be in the inventory for the below example.
#
# [containers]
# mycontainer ansible_connection=lxd
#
- hosts:
    - mycontainer
  tasks:
    - template: src=foo.j2 dest=/etc/bar

- hosts: localhost
  connection: local
  tasks:
    - name: Create a stopped container
      lxd_container:
        name: mycontainer
        state: stopped
        source:
          type: image
          mode: pull
          server: https://images.linuxcontainers.org
          protocol: lxd
          alias: "ubuntu/xenial/amd64"
        profiles: ["default"]

- hosts: localhost
  connection: local
  tasks:
    - name: Restart a container
      lxd_container:
        name: mycontainer
        state: restarted
        source:
          type: image
          mode: pull
          server: https://images.linuxcontainers.org
          protocol: lxd
          alias: "ubuntu/xenial/amd64"
        profiles: ["default"]

# An example for connecting to the LXD server using https
- hosts: localhost
  connection: local
  tasks:
  - name: create macvlan profile
    lxd_container:
      url: https://127.0.0.1:8443
      # These cert_file and key_file values are equal to the default values.
      #cert_file: "{{ lookup('env', 'HOME') }}/.config/lxc/client.crt"
      #key_file: "{{ lookup('env', 'HOME') }}/.config/lxc/client.key"
      trust_password: mypassword
      type: profile
      name: macvlan
      state: present
      config: {}
      description: 'my macvlan profile'
      devices:
        eth0:
          nictype: macvlan
          parent: br0
          type: nic
"""

RETURN="""
lxd_container:
  description: container information
  returned: success
  type: object
  contains:
    addresses:
      description: mapping from the network device name to a list of IPv4 addresses in the container
      returned: when state is started or restarted
      type: object
      sample: {"eth0": ["10.155.92.191"]}
    old_state:
      description: the old state of the container
      returned: when state is started or restarted
      sample: "stopped"
    logs:
      descriptions: the logs of requests and responses
      returned: when requests are sent
    actions:
      description: list of actions performed for the container
      returned: success
      type: list
      sample: ["create", "start"]
"""

import os

try:
    import json
except ImportError:
    import simplejson as json

# httplib/http.client connection using unix domain socket
import socket
import ssl
try:
    from httplib import HTTPConnection, HTTPSConnection
except ImportError:
    # Python 3
    from http.client import HTTPConnection, HTTPSConnection

class UnixHTTPConnection(HTTPConnection):
    def __init__(self, path, timeout=None):
        HTTPConnection.__init__(self, 'localhost', timeout=timeout)
        self.path = path

    def connect(self):
        sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
        sock.connect(self.path)
        self.sock = sock

from ansible.module_utils.urls import generic_urlparse
try:
    from urlparse import urlparse
except ImportError:
    # Python 3
    from url.parse import urlparse

# LXD_ANSIBLE_STATES is a map of states that contain values of methods used
# when a particular state is evoked.
LXD_ANSIBLE_STATES = {
    'present': '', # TODO: Separate state for profile
    'started': '_started',
    'stopped': '_stopped',
    'restarted': '_restarted',
    'absent': '_destroyed',
    'frozen': '_frozen'
}

# ANSIBLE_LXD_STATES is a map of states of lxd containers to the Ansible
# lxc_container module state parameter value.
ANSIBLE_LXD_STATES = {
    'Running': 'started',
    'Stopped': 'stopped',
    'Frozen': 'frozen',
}

# CONFIG_PARAMS is a map from a resource type to config attribute names.
CONFIG_PARAMS = {
    'container': ['architecture', 'config', 'devices', 'ephemeral', 'profiles', 'source'],
    'profile': ['config', 'description', 'devices']
}

try:
    callable(all)
except NameError:
    # For python <2.5
    # This definition is copied from https://docs.python.org/2/library/functions.html#all
    def all(iterable):
        for element in iterable:
            if not element:
                return False
        return True

class LxdContainerManagement(object):
    def __init__(self, module):
        """Management of LXC containers via Ansible.

        :param module: Processed Ansible Module.
        :type module: ``object``
        """
        self.module = module
        self.name = self.module.params['name']
        self.type = self.module.params['type']
        self._build_config()
        # TODO: check state value according to type
        self.state = self.module.params['state']
        self.new_name = self.module.params.get('new_name', None)
        self.timeout = self.module.params['timeout']
        self.wait_for_ipv4_addresses = self.module.params['wait_for_ipv4_addresses']
        self.force_stop = self.module.params['force_stop']
        self.addresses = None
        self.unix_socket_path = self.module.params['unix_socket_path']
        self.url = self.module.params.get('url', None)
        self.key_file = self.module.params.get('key_file', None)
        self.cert_file = self.module.params.get('cert_file', None)
        self.trust_password = self.module.params.get('trust_password', None)
        if self.url is None:
            self.connection = UnixHTTPConnection(self.unix_socket_path, timeout=self.timeout)
        else:
            parts = generic_urlparse(urlparse(self.url))
            ctx = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
            ctx.load_cert_chain(self.cert_file, keyfile=self.key_file)
            self.connection = HTTPSConnection(parts.get('netloc'), context=ctx, timeout=self.timeout)
        self.logs = []
        self.actions = []

    def _build_config(self):
        self.config = {}
        for attr in CONFIG_PARAMS[self.type]:
            param_val = self.module.params.get(attr, None)
            if param_val is not None:
                self.config[attr] = param_val

    def _authenticate(self):
        body_json = {'type': 'client', 'password': self.trust_password}
        self._send_request('POST', '/1.0/certificates', body_json=body_json)

    def _send_request(self, method, url, body_json=None, ok_error_codes=None):
        try:
            body = json.dumps(body_json)
            self.connection.request(method, url, body=body)
            resp = self.connection.getresponse()
            resp_json = json.loads(resp.read())
            self.logs.append({
                'type': 'sent request',
                'request': {'method': method, 'url': url, 'json': body_json, 'timeout': self.timeout},
                'response': {'json': resp_json}
            })
            resp_type = resp_json.get('type', None)
            if resp_type == 'error':
                if ok_error_codes is not None and resp_json['error_code'] in ok_error_codes:
                    return resp_json
                self.module.fail_json(
                    msg='error response',
                    request={'method': method, 'url': url, 'json': body_json, 'timeout': self.timeout},
                    response={'json': resp_json},
                    logs=self.logs
                )
            return resp_json
        except socket.error as e:
            if self.url is None:
                self.module.fail_json(
                    msg='cannot connect to the LXD server',
                    unix_socket_path=self.unix_socket_path, error=e
                )
            else:
                self.module.fail_json(
                    msg='cannot connect to the LXD server',
                    url=self.url, key_file=self.key_file, cert_file=self.cert_file,
                    error=e
                )

    def _operate_and_wait(self, method, path, body_json=None):
        resp_json = self._send_request(method, path, body_json=body_json)
        if resp_json['type'] == 'async':
            url = '{0}/wait?timeout={1}'.format(resp_json['operation'], self.timeout)
            resp_json = self._send_request('GET', url)
            if resp_json['metadata']['status'] != 'Success':
                self.module.fail_json(
                    msg='error response for waiting opearation',
                    request={'method': method, 'url': url, 'timeout': self.timeout},
                    response={'json': resp_json},
                    logs=self.logs
                )
        return resp_json

    def _get_container_json(self):
        return self._send_request(
            'GET', '/1.0/containers/{0}'.format(self.name),
            ok_error_codes=[404]
        )

    def _get_container_state_json(self):
        return self._send_request(
            'GET', '/1.0/containers/{0}/state'.format(self.name),
            ok_error_codes=[404]
        )

    @staticmethod
    def _container_json_to_module_state(resp_json):
        if resp_json['type'] == 'error':
            return 'absent'
        return ANSIBLE_LXD_STATES[resp_json['metadata']['status']]

    def _change_state(self, action, force_stop=False):
        body_json={'action': action, 'timeout': self.timeout}
        if force_stop:
            body_json['force'] = True
        return self._operate_and_wait('PUT', '/1.0/containers/{0}/state'.format(self.name), body_json=body_json)

    def _create_container(self):
        config = self.config.copy()
        config['name'] = self.name
        self._operate_and_wait('POST', '/1.0/containers', config)
        self.actions.append('create')

    def _start_container(self):
        self._change_state('start')
        self.actions.append('start')

    def _stop_container(self):
        self._change_state('stop', self.force_stop)
        self.actions.append('stop')

    def _restart_container(self):
        self._change_state('restart', self.force_stop)
        self.actions.append('restart')

    def _delete_container(self):
        return self._operate_and_wait('DELETE', '/1.0/containers/{0}'.format(self.name))
        self.actions.append('delete')

    def _freeze_container(self):
        self._change_state('freeze')
        self.actions.append('freeze')

    def _unfreeze_container(self):
        self._change_state('unfreeze')
        self.actions.append('unfreez')

    def _container_ipv4_addresses(self, ignore_devices=['lo']):
        resp_json = self._get_container_state_json()
        network = resp_json['metadata']['network'] or {}
        network = dict((k, v) for k, v in network.items() if k not in ignore_devices) or {}
        addresses = dict((k, [a['address'] for a in v['addresses'] if a['family'] == 'inet']) for k, v in network.items()) or {}
        return addresses

    @staticmethod
    def _has_all_ipv4_addresses(addresses):
        return len(addresses) > 0 and all([len(v) > 0 for v in addresses.itervalues()])

    def _get_addresses(self):
        due = datetime.datetime.now() + datetime.timedelta(seconds=self.timeout)
        while datetime.datetime.now() < due:
            time.sleep(1)
            addresses = self._container_ipv4_addresses()
            if self._has_all_ipv4_addresses(addresses):
                self.addresses = addresses
                return

        state_changed = len(self.actions) > 0
        self.module.fail_json(
            failed=True,
            msg='timeout for getting IPv4 addresses',
            changed=state_changed,
            actions=self.actions,
            logs=self.logs)

    def _started(self):
        if self.old_state == 'absent':
            self._create_container()
            self._start_container()
        else:
            if self.old_state == 'frozen':
                self._unfreeze_container()
            elif self.old_state == 'stopped':
                self._start_container()
            if self._needs_to_apply_container_configs():
                self._apply_container_configs()
        if self.wait_for_ipv4_addresses:
            self._get_addresses()

    def _stopped(self):
        if self.old_state == 'absent':
            self._create_container()
        else:
            if self.old_state == 'stopped':
                if self._needs_to_apply_container_configs():
                    self._start_container()
                    self._apply_container_configs()
                    self._stop_container()
            else:
                if self.old_state == 'frozen':
                    self._unfreeze_container()
                if self._needs_to_apply_container_configs():
                    self._apply_container_configs()
                self._stop_container()

    def _restarted(self):
        if self.old_state == 'absent':
            self._create_container()
            self._start_container()
        else:
            if self.old_state == 'frozen':
                self._unfreeze_container()
            if self._needs_to_apply_container_configs():
                self._apply_container_configs()
            self._restart_container()
        if self.wait_for_ipv4_addresses:
            self._get_addresses()

    def _destroyed(self):
        if self.old_state != 'absent':
            if self.old_state == 'frozen':
                self._unfreeze_container()
            self._stop_container()
            self._delete_container()

    def _frozen(self):
        if self.old_state == 'absent':
            self._create_container()
            self._start_container()
            self._freeze_container()
        else:
            if self.old_state == 'stopped':
                self._start_container()
            if self._needs_to_apply_container_configs():
                self._apply_container_configs()
            self._freeze_container()

    def _needs_to_change_container_config(self, key):
        if key not in self.config:
            return False
        if key == 'config':
            old_configs = dict((k, v) for k, v in self.old_container_json['metadata'][key].items() if not k.startswith('volatile.'))
        else:
            old_configs = self.old_container_json['metadata'][key]
        return self.config[key] != old_configs

    def _needs_to_apply_container_configs(self):
        return (
            self._needs_to_change_container_config('architecture') or
            self._needs_to_change_container_config('config') or
            self._needs_to_change_container_config('ephemeral') or
            self._needs_to_change_container_config('devices') or
            self._needs_to_change_container_config('profiles')
        )

    def _apply_container_configs(self):
        old_metadata = self.old_container_json['metadata']
        body_json = {
            'architecture': old_metadata['architecture'],
            'config': old_metadata['config'],
            'devices': old_metadata['devices'],
            'profiles': old_metadata['profiles']
        }
        if self._needs_to_change_container_config('architecture'):
            body_json['architecture'] = self.config['architecture']
        if self._needs_to_change_container_config('config'):
            for k, v in self.config['config'].items():
                body_json['config'][k] = v
        if self._needs_to_change_container_config('ephemeral'):
            body_json['ephemeral'] = self.config['ephemeral']
        if self._needs_to_change_container_config('devices'):
            body_json['devices'] = self.config['devices']
        if self._needs_to_change_container_config('profiles'):
            body_json['profiles'] = self.config['profiles']
        self._operate_and_wait('PUT', '/1.0/containers/{0}'.format(self.name), body_json=body_json)
        self.actions.append('apply_container_configs')

    def _get_profile_json(self):
        return self._send_request(
            'GET', '/1.0/profiles/{0}'.format(self.name),
            ok_error_codes=[404]
        )

    @staticmethod
    def _profile_json_to_module_state(resp_json):
        if resp_json['type'] == 'error':
            return 'absent'
        return 'present'

    def _update_profile(self):
        if self.state == 'present':
            if self.old_state == 'absent':
                if self.new_name is None:
                    self._create_profile()
                else:
                    self.module.fail_json(
                        failed=True,
                        msg='new_name must not be set when the profile does not exist and the specified state is present',
                        changed=False)
            else:
                if self.new_name is not None and self.new_name != self.name:
                    self._rename_profile()
                if self._needs_to_apply_profile_configs():
                    self._apply_profile_configs()
        elif self.state == 'absent':
            if self.old_state == 'present':
                if self.new_name is None:
                    self._delete_profile()
                else:
                    self.module.fail_json(
                        failed=True,
                        msg='new_name must not be set when the profile exists and the specified state is absent',
                        changed=False)

    def _create_profile(self):
        config = self.config.copy()
        config['name'] = self.name
        self._send_request('POST', '/1.0/profiles', config)
        self.actions.append('create')

    def _rename_profile(self):
        config = {'name': self.new_name}
        self._send_request('POST', '/1.0/profiles/{}'.format(self.name), config)
        self.actions.append('rename')
        self.name = self.new_name

    def _needs_to_change_profile_config(self, key):
        if key not in self.config:
            return False
        old_configs = self.old_profile_json['metadata'].get(key, None)
        return self.config[key] != old_configs

    def _needs_to_apply_profile_configs(self):
        return (
            self._needs_to_change_profile_config('config') or
            self._needs_to_change_profile_config('description') or
            self._needs_to_change_profile_config('devices')
        )

    def _apply_profile_configs(self):
        config = self.old_profile_json.copy()
        for k, v in self.config.iteritems():
            config[k] = v
        self._send_request('PUT', '/1.0/profiles/{}'.format(self.name), config)
        self.actions.append('apply_profile_configs')

    def _delete_profile(self):
        self._send_request('DELETE', '/1.0/profiles/{}'.format(self.name))
        self.actions.append('delete')

    def run(self):
        """Run the main method."""

        if self.trust_password is not None:
            self._authenticate()

        if self.type == 'container':
            self.old_container_json = self._get_container_json()
            self.old_state = self._container_json_to_module_state(self.old_container_json)
            action = getattr(self, LXD_ANSIBLE_STATES[self.state])
            action()
        elif self.type == 'profile':
            self.old_profile_json = self._get_profile_json()
            self.old_state = self._profile_json_to_module_state(self.old_profile_json)
            self._update_profile()

        state_changed = len(self.actions) > 0
        result_json = {
            'changed': state_changed,
            'old_state': self.old_state,
            'logs': self.logs,
            'actions': self.actions
        }
        if self.addresses is not None:
            result_json['addresses'] = self.addresses
        self.module.exit_json(**result_json)


def main():
    """Ansible Main module."""

    module = AnsibleModule(
        argument_spec=dict(
            name=dict(
                type='str',
                required=True
            ),
            new_name=dict(
                type='str',
            ),
            type=dict(
                type='str',
                choices=CONFIG_PARAMS.keys(),
                default='container'
            ),
            architecture=dict(
                type='str',
            ),
            config=dict(
                type='dict',
            ),
            description=dict(
                type='str',
            ),
            devices=dict(
                type='dict',
            ),
            ephemeral=dict(
                type='bool',
            ),
            profiles=dict(
                type='list',
            ),
            source=dict(
                type='dict',
            ),
            state=dict(
                choices=LXD_ANSIBLE_STATES.keys(),
                default='started'
            ),
            timeout=dict(
                type='int',
                default=30
            ),
            wait_for_ipv4_addresses=dict(
                type='bool',
                default=False
            ),
            force_stop=dict(
                type='bool',
                default=False
            ),
            unix_socket_path=dict(
                type='str',
                default='/var/lib/lxd/unix.socket'
            ),
            url=dict(
                type='str',
            ),
            key_file=dict(
                type='str',
                default='{}/.config/lxc/client.key'.format(os.environ['HOME'])
            ),
            cert_file=dict(
                type='str',
                default='{}/.config/lxc/client.crt'.format(os.environ['HOME'])
            ),
            trust_password=dict(
                type='str',
            )
        ),
        supports_check_mode=False,
    )

    lxd_manage = LxdContainerManagement(module=module)
    lxd_manage.run()

# import module bits
from ansible.module_utils.basic import *
if __name__ == '__main__':
    main()