#!/usr/bin/python

from ansible.module_utils.basic import AnsibleModule
try:
    from ansible.module_utils.ca_common import exec_command, \
                                               is_containerized, \
                                               fatal
except ImportError:
    from module_utils.ca_common import exec_command, \
                                       is_containerized, \
                                       fatal
import datetime
import copy
import json
import os
import re

ANSIBLE_METADATA = {
    'metadata_version': '1.0',
    'status': ['preview'],
    'supported_by': 'community'
}

DOCUMENTATION = '''
---
module: ceph_volume

short_description: Create ceph OSDs with ceph-volume

description:
    - Using the ceph-volume utility available in Ceph this module
      can be used to create ceph OSDs that are backed by logical volumes.
    - Only available in ceph versions luminous or greater.

options:
    cluster:
        description:
            - The ceph cluster name.
        required: false
        default: ceph
    objectstore:
        description:
            - The objectstore of the OSD.
        required: false
        choices: ['bluestore']
        default: bluestore
    action:
        description:
            - The action to take. Creating OSDs and zapping or querying devices.
        required: true
        choices: ['create', 'zap', 'batch', 'prepare', 'activate', 'list', 'inventory']
        default: create
    data:
        description:
            - The logical volume name or device to use for the OSD data.
        required: true
    data_vg:
        description:
            - If data is a lv, this must be the name of the volume group it belongs to.
        required: false
    osd_fsid:
        description:
            - The OSD FSID
        required: false
    osd_id:
        description:
            - The OSD ID
        required: false
    db:
        description:
            - A partition or logical volume name to use for block.db.
        required: false
    db_vg:
        description:
            - If db is a lv, this must be the name of the volume group it belongs to.  # noqa: E501
        required: false
    wal:
        description:
            - A partition or logical volume name to use for block.wal.
        required: false
    wal_vg:
        description:
            - If wal is a lv, this must be the name of the volume group it belongs to.  # noqa: E501
        required: false
    crush_device_class:
        description:
            - Will set the crush device class for the OSD.
        required: false
    dmcrypt:
        description:
            - If set to True the OSD will be encrypted with dmcrypt.
        required: false
    batch_devices:
        description:
            - A list of devices to pass to the 'ceph-volume lvm batch' subcommand.
            - Only applicable if action is 'batch'.
        required: false
    osds_per_device:
        description:
            - The number of OSDs to create per device.
            - Only applicable if action is 'batch'.
        required: false
        default: 1
    block_db_size:
        description:
            - The size in bytes of bluestore block db lvs.
            - The default of -1 means to create them as big as possible.
            - Only applicable if action is 'batch'.
        required: false
        default: -1
    block_db_devices:
        description:
            - A list of devices for bluestore block db to pass to the 'ceph-volume lvm batch' subcommand.
            - Only applicable if action is 'batch'.
        required: false
    wal_devices:
        description:
            - A list of devices for bluestore block wal to pass to the 'ceph-volume lvm batch' subcommand.
            - Only applicable if action is 'batch'.
        required: false
    report:
        description:
            - If provided the --report flag will be passed to 'ceph-volume lvm batch'.
            - No OSDs will be created.
            - Results will be returned in json format.
            - Only applicable if action is 'batch'.
        required: false
    list:
        description:
            - List potential Ceph LVM metadata on a device
        required: false
    inventory:
        description:
            - List storage device inventory.
        required: false

author:
    - Andrew Schoen (@andrewschoen)
    - Sebastien Han <seb@redhat.com>
'''

EXAMPLES = '''
- name: set up a bluestore osd with a raw device for data
  ceph_volume:
    objectstore: bluestore
    data: /dev/sdc
    action: create


- name: set up a bluestore osd with an lv for data and partitions for block.wal and block.db  # noqa: E501
  ceph_volume:
    objectstore: bluestore
    data: data-lv
    data_vg: data-vg
    db: /dev/sdc1
    wal: /dev/sdc2
    action: create
'''


def container_exec(binary, container_image, mounts=None):
    '''
    Build the docker CLI to run a command inside a container
    '''
    _mounts = {}
    _mounts['/run/lock/lvm'] = '/run/lock/lvm:z'
    _mounts['/var/run/udev'] = '/var/run/udev:z'
    _mounts['/dev'] = '/dev'
    _mounts['/etc/ceph'] = '/etc/ceph:z'
    _mounts['/run/lvm'] = '/run/lvm'
    _mounts['/var/lib/ceph'] = '/var/lib/ceph:z'
    _mounts['/var/log/ceph'] = '/var/log/ceph:z'
    if mounts is None:
        mounts = _mounts
    else:
        _mounts.update(mounts)

    volumes = sum(
        [['-v', '{}:{}'.format(src_dir, dst_dir)]
            for src_dir, dst_dir in _mounts.items()], [])

    container_binary = os.getenv('CEPH_CONTAINER_BINARY')
    command_exec = [container_binary, 'run',
                    '--rm',
                    '--privileged',
                    '--net=host',
                    '--ipc=host'] + volumes + \
        ['--entrypoint=' + binary, container_image]
    return command_exec


def build_cmd(action, container_image,
              cluster='ceph',
              binary='ceph-volume', mounts=None):
    '''
    Build the ceph-volume command
    '''

    _binary = binary

    if container_image:
        cmd = container_exec(
            binary, container_image, mounts=mounts)
    else:
        binary = [binary]
        cmd = binary

    if _binary == 'ceph-volume':
        cmd.extend(['--cluster', cluster])

    cmd.extend(action)

    return cmd


def get_data(data, data_vg):
    if data_vg:
        data = '{0}/{1}'.format(data_vg, data)
    return data


def get_journal(journal, journal_vg):
    if journal_vg:
        journal = '{0}/{1}'.format(journal_vg, journal)
    return journal


def get_db(db, db_vg):
    if db_vg:
        db = '{0}/{1}'.format(db_vg, db)
    return db


def get_wal(wal, wal_vg):
    if wal_vg:
        wal = '{0}/{1}'.format(wal_vg, wal)
    return wal


def batch(module, container_image, report=None):
    '''
    Batch prepare OSD devices
    '''

    # get module variables
    cluster = module.params['cluster']
    objectstore = module.params['objectstore']
    batch_devices = module.params.get('batch_devices', None)
    crush_device_class = module.params.get('crush_device_class', None)
    block_db_size = module.params.get('block_db_size', None)
    block_db_devices = module.params.get('block_db_devices', None)
    wal_devices = module.params.get('wal_devices', None)
    dmcrypt = module.params.get('dmcrypt', None)
    osds_per_device = module.params.get('osds_per_device', 1)

    if not osds_per_device:
        fatal('osds_per_device must be provided if action is "batch"', module)

    if osds_per_device < 1:
        fatal('osds_per_device must be greater than 0 if action is "batch"', module)  # noqa: E501

    if not batch_devices:
        fatal('batch_devices must be provided if action is "batch"', module)

    # Build the CLI
    action = ['lvm', 'batch']
    cmd = build_cmd(action, container_image, cluster)
    cmd.extend(['--%s' % objectstore])
    if not report:
        cmd.append('--yes')

    if container_image:
        cmd.append('--prepare')

    if crush_device_class:
        cmd.extend(['--crush-device-class', crush_device_class])

    if dmcrypt:
        cmd.append('--dmcrypt')

    if osds_per_device > 1:
        cmd.extend(['--osds-per-device', str(osds_per_device)])

    if objectstore == 'bluestore' and block_db_size != '-1':
        cmd.extend(['--block-db-size', block_db_size])

    cmd.extend(batch_devices)

    if block_db_devices and objectstore == 'bluestore':
        cmd.append('--db-devices')
        cmd.extend(block_db_devices)

    if wal_devices and objectstore == 'bluestore':
        cmd.append('--wal-devices')
        cmd.extend(wal_devices)

    return cmd


def ceph_volume_cmd(subcommand, container_image, cluster=None):
    '''
    Build ceph-volume initial command
    '''

    if container_image:
        binary = 'ceph-volume'
        cmd = container_exec(
            binary, container_image)
    else:
        binary = ['ceph-volume']
        cmd = binary

    if cluster:
        cmd.extend(['--cluster', cluster])

    cmd.append('lvm')
    cmd.append(subcommand)

    return cmd


def prepare_or_create_osd(module, action, container_image):
    '''
    Prepare or create OSD devices
    '''

    # get module variables
    cluster = module.params['cluster']
    objectstore = module.params['objectstore']
    data = module.params['data']
    data_vg = module.params.get('data_vg', None)
    data = get_data(data, data_vg)
    db = module.params.get('db', None)
    db_vg = module.params.get('db_vg', None)
    wal = module.params.get('wal', None)
    wal_vg = module.params.get('wal_vg', None)
    crush_device_class = module.params.get('crush_device_class', None)
    dmcrypt = module.params.get('dmcrypt', None)

    # Build the CLI
    action = ['lvm', action]
    cmd = build_cmd(action, container_image, cluster)
    cmd.extend(['--%s' % objectstore])
    cmd.append('--data')
    cmd.append(data)

    if db and objectstore == 'bluestore':
        db = get_db(db, db_vg)
        cmd.extend(['--block.db', db])

    if wal and objectstore == 'bluestore':
        wal = get_wal(wal, wal_vg)
        cmd.extend(['--block.wal', wal])

    if crush_device_class:
        cmd.extend(['--crush-device-class', crush_device_class])

    if dmcrypt:
        cmd.append('--dmcrypt')

    return cmd


def list_osd(module, container_image):
    '''
    List will detect wether or not a device has Ceph LVM Metadata
    '''

    # get module variables
    cluster = module.params['cluster']
    data = module.params.get('data', None)
    data_vg = module.params.get('data_vg', None)
    data = get_data(data, data_vg)

    # Build the CLI
    action = ['lvm', 'list']
    cmd = build_cmd(action,
                    container_image,
                    cluster,
                    mounts={'/var/lib/ceph': '/var/lib/ceph:ro'})
    if data:
        cmd.append(data)
    cmd.append('--format=json')

    return cmd


def list_storage_inventory(module, container_image):
    '''
    List storage inventory.
    '''

    action = ['inventory']
    cmd = build_cmd(action, container_image)
    cmd.append('--format=json')

    return cmd


def activate_osd():
    '''
    Activate all the OSDs on a machine
    '''

    # build the CLI
    action = ['lvm', 'activate']
    container_image = None
    cmd = build_cmd(action, container_image)
    cmd.append('--all')

    return cmd


def is_lv(module, vg, lv, container_image):
    '''
    Check if an LV exists
    '''

    args = ['--noheadings', '--reportformat', 'json', '--select', 'lv_name={},vg_name={}'.format(lv, vg)]  # noqa: E501

    cmd = build_cmd(args, container_image, binary='lvs')

    rc, cmd, out, err = exec_command(module, cmd)

    if rc == 0:
        result = json.loads(out)['report'][0]['lv']
        if len(result) > 0:
            return True

    return False


def zap_devices(module, container_image):
    '''
    Will run 'ceph-volume lvm zap' on all devices, lvs and partitions
    used to create the OSD. The --destroy flag is always passed so that
    if an OSD was originally created with a raw device or partition for
    'data' then any lvs that were created by ceph-volume are removed.
    '''

    # get module variables
    data = module.params.get('data', None)
    data_vg = module.params.get('data_vg', None)
    db = module.params.get('db', None)
    db_vg = module.params.get('db_vg', None)
    wal = module.params.get('wal', None)
    wal_vg = module.params.get('wal_vg', None)
    osd_fsid = module.params.get('osd_fsid', None)
    osd_id = module.params.get('osd_id', None)
    destroy = module.params.get('destroy', True)

    # build the CLI
    action = ['lvm', 'zap']
    cmd = build_cmd(action, container_image)
    if destroy:
        cmd.append('--destroy')

    if osd_fsid:
        cmd.extend(['--osd-fsid', osd_fsid])

    if osd_id:
        cmd.extend(['--osd-id', osd_id])

    if data:
        data = get_data(data, data_vg)
        cmd.append(data)

    if db:
        db = get_db(db, db_vg)
        cmd.extend([db])

    if wal:
        wal = get_wal(wal, wal_vg)
        cmd.extend([wal])

    return cmd


def allowed_in_check_mode(module):
    '''
    Check if the action is allowed in check mode
    '''

    action = module.params['action']
    report = module.params.get('report', False)

    # batch is allowed in check mode if report is set
    if action == 'batch' and report:
        return True

    allowed_actions = ['list', 'inventory']

    return action in allowed_actions


def run_module():
    module_args = dict(
        cluster=dict(type='str', required=False, default='ceph'),
        objectstore=dict(type='str', required=False, choices=[
                         'bluestore'], default='bluestore'),
        action=dict(type='str', required=False, choices=[
                    'create', 'zap', 'batch', 'prepare', 'activate', 'list',
                    'inventory'], default='create'),  # noqa: 4502
        data=dict(type='str', required=False),
        data_vg=dict(type='str', required=False),
        db=dict(type='str', required=False),
        db_vg=dict(type='str', required=False),
        wal=dict(type='str', required=False),
        wal_vg=dict(type='str', required=False),
        crush_device_class=dict(type='str', required=False),
        dmcrypt=dict(type='bool', required=False, default=False),
        batch_devices=dict(type='list', required=False, default=[]),
        osds_per_device=dict(type='int', required=False, default=1),
        block_db_size=dict(type='str', required=False, default='-1'),
        block_db_devices=dict(type='list', required=False, default=[]),
        wal_devices=dict(type='list', required=False, default=[]),
        report=dict(type='bool', required=False, default=False),
        osd_fsid=dict(type='str', required=False),
        osd_id=dict(type='str', required=False),
        destroy=dict(type='bool', required=False, default=True),
    )

    module = AnsibleModule(
        argument_spec=module_args,
        supports_check_mode=True,
        mutually_exclusive=[
            ('data', 'osd_fsid', 'osd_id'),
        ],
        required_if=[
            ('action', 'zap', ('data', 'osd_fsid', 'osd_id'), True)
        ]
    )

    result = dict(
        changed=False,
        stdout='',
        stderr='',
        rc=0,
        start='',
        end='',
        delta='',
    )

    if module.check_mode and not allowed_in_check_mode(module):
        module.exit_json(**result)

    # start execution
    startd = datetime.datetime.now()

    # get the desired action
    action = module.params['action']

    # will return either the image name or None
    container_image = is_containerized()

    # Assume the task's status will be 'changed'
    changed = True

    if action == 'create' or action == 'prepare':
        # First test if the device has Ceph LVM Metadata
        rc, cmd, out, err = exec_command(
            module, list_osd(module, container_image))

        # list_osd returns a dict, if the dict is empty this means
        # we can not check the return code since it's not consistent
        # with the plain output
        # see: http://tracker.ceph.com/issues/36329
        # FIXME: it's probably less confusing to check for rc

        # convert out to json, ansible returns a string...
        try:
            out_dict = json.loads(out)
        except ValueError:
            fatal("Could not decode json output: {} from the command {}".format(out, cmd), module)  # noqa: E501

        if out_dict:
            data = module.params['data']
            result['stdout'] = 'skipped, since {0} is already used for an osd'.format(data)  # noqa: E501
            result['rc'] = 0
            module.exit_json(**result)

        # Prepare or create the OSD
        rc, cmd, out, err = exec_command(
            module, prepare_or_create_osd(module, action, container_image))
        err = re.sub('[a-zA-Z0-9+/]{38}==', '*' * 8, err)

    elif action == 'activate':
        if container_image:
            fatal(
                "This is not how container's activation happens, nothing to activate", module)  # noqa: E501

        # Activate the OSD
        rc, cmd, out, err = exec_command(
            module, activate_osd())

    elif action == 'zap':
        # Zap the OSD
        skip = []
        for device_type in ['journal', 'data', 'db', 'wal']:
            # 1/ if we passed vg/lv
            if module.params.get('{}_vg'.format(device_type), None) and module.params.get(device_type, None):  # noqa: E501
                # 2/ check this is an actual lv/vg
                ret = is_lv(module, module.params['{}_vg'.format(device_type)], module.params[device_type], container_image)  # noqa: E501
                skip.append(ret)
                # 3/ This isn't a lv/vg device
                if not ret:
                    module.params['{}_vg'.format(device_type)] = False
                    module.params[device_type] = False
            # 4/ no journal|data|db|wal|_vg was passed, so it must be a raw device  # noqa: E501
            elif not module.params.get('{}_vg'.format(device_type), None) and module.params.get(device_type, None):  # noqa: E501
                skip.append(True)

        cmd = zap_devices(module, container_image)

        if any(skip) or module.params.get('osd_fsid', None) \
                or module.params.get('osd_id', None):
            rc, cmd, out, err = exec_command(
                module, cmd)
            for scan_cmd in ['vgscan', 'lvscan']:
                module.run_command([scan_cmd, '--cache'])
        else:
            out = 'Skipped, nothing to zap'
            err = ''
            changed = False
            rc = 0

    elif action == 'list':
        # List Ceph LVM Metadata on a device
        rc, cmd, out, err = exec_command(
            module, list_osd(module, container_image))

    elif action == 'inventory':
        # List storage device inventory.
        rc, cmd, out, err = exec_command(
            module, list_storage_inventory(module, container_image))

    elif action == 'batch':
        # Batch prepare AND activate OSDs
        report = module.params.get('report', None)

        # Add --report flag for the idempotency test
        report_flags = [
            '--report',
            '--format=json',
        ]

        cmd = batch(module, container_image, report=True)
        batch_report_cmd = copy.copy(cmd)
        batch_report_cmd.extend(report_flags)

        # Run batch --report to see what's going to happen
        # Do not run the batch command if there is nothing to do
        rc, cmd, out, err = exec_command(
            module, batch_report_cmd)
        try:
            if not out:
                out = '{}'
            report_result = json.loads(out)
        except ValueError:
            strategy_changed_in_out = "strategy changed" in out
            strategy_changed_in_err = "strategy changed" in err
            strategy_changed = strategy_changed_in_out or \
                strategy_changed_in_err
            if strategy_changed:
                if strategy_changed_in_out:
                    out = json.dumps({"changed": False,
                                      "stdout": out.rstrip("\r\n")})
                elif strategy_changed_in_err:
                    out = json.dumps({"changed": False,
                                      "stderr": err.rstrip("\r\n")})
                rc = 0
                changed = False
            else:
                out = out.rstrip("\r\n")
            result = dict(
                cmd=cmd,
                stdout=out.rstrip('\r\n'),
                stderr=err.rstrip('\r\n'),
                rc=rc,
                changed=changed,
            )
            if strategy_changed:
                module.exit_json(**result)
            module.fail_json(msg='non-zero return code', **result)

        if not report:
            if 'changed' in report_result:
                # we have the old batch implementation
                # if not asking for a report, let's just run the batch command
                changed = report_result['changed']
                if changed:
                    # Batch prepare the OSD
                    rc, cmd, out, err = exec_command(
                        module, batch(module, container_image))
                    err = re.sub('[a-zA-Z0-9+/]{38}==', '*' * 8, err)
            else:
                # we have the refactored batch, its idempotent so lets just
                # run it
                rc, cmd, out, err = exec_command(
                    module, batch(module, container_image))
                err = re.sub('[a-zA-Z0-9+/]{38}==', '*' * 8, err)
        else:
            cmd = batch_report_cmd

    endd = datetime.datetime.now()
    delta = endd - startd

    result = dict(
        cmd=cmd,
        start=str(startd),
        end=str(endd),
        delta=str(delta),
        rc=rc,
        stdout=out.rstrip('\r\n'),
        stderr=err.rstrip('\r\n'),
        changed=changed,
    )

    if rc != 0:
        module.fail_json(msg='non-zero return code', **result)

    module.exit_json(**result)


def main():
    run_module()


if __name__ == '__main__':
    main()