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"""
Library for VMware Storage Policy management (via the pbm endpoint)

This library is used to manage the various policies available in VMware

:codeauthor: Alexandru Bleotu <alexandru.bleotu@morganstaley.com>

Dependencies
~~~~~~~~~~~~

- pyVmomi Python Module

pyVmomi
-------

PyVmomi can be installed via pip:

.. code-block:: bash

    pip install pyVmomi

.. note::

    versions of Python. If using version 6.0 of pyVmomi, Python 2.6,
    Python 2.7.9, or newer must be present. This is due to an upstream dependency
    in pyVmomi 6.0 that is not supported in Python versions 2.7 to 2.7.8. If the
    version of Python is not in the supported range, you will need to install an
    earlier version of pyVmomi. See `Issue #29537`_ for more information.

.. _Issue #29537: https://github.com/saltstack/salt/issues/29537

Based on the note above, to install an earlier version of pyVmomi than the
version currently listed in PyPi, run the following:

.. code-block:: bash

    pip install pyVmomi==5.5.0.2014.1.1
"""

import logging

import salt.utils.vmware
from salt.exceptions import (
    VMwareApiError,
    VMwareObjectRetrievalError,
    VMwareRuntimeError,
)

try:
    from pyVmomi import pbm, vim, vmodl  # pylint: disable=no-name-in-module

    HAS_PYVMOMI = True
except ImportError:
    HAS_PYVMOMI = False


# Get Logging Started
log = logging.getLogger(__name__)


def __virtual__():
    """
    Only load if PyVmomi is installed.
    """
    if HAS_PYVMOMI:
        return True
    else:
        return (
            False,
            "Missing dependency: The salt.utils.pbm module "
            "requires the pyvmomi library",
        )


def get_profile_manager(service_instance):
    """
    Returns a profile manager

    service_instance
        Service instance to the host or vCenter
    """
    stub = salt.utils.vmware.get_new_service_instance_stub(
        service_instance, ns="pbm/2.0", path="/pbm/sdk"
    )
    pbm_si = pbm.ServiceInstance("ServiceInstance", stub)
    try:
        profile_manager = pbm_si.RetrieveContent().profileManager
    except vim.fault.NoPermission as exc:
        log.exception(exc)
        raise VMwareApiError(
            f"Not enough permissions. Required privilege: {exc.privilegeId}"
        )
    except vim.fault.VimFault as exc:
        log.exception(exc)
        raise VMwareApiError(exc.msg)
    except vmodl.RuntimeFault as exc:
        log.exception(exc)
        raise VMwareRuntimeError(exc.msg)
    return profile_manager


def get_placement_solver(service_instance):
    """
    Returns a placement solver

    service_instance
        Service instance to the host or vCenter
    """
    stub = salt.utils.vmware.get_new_service_instance_stub(
        service_instance, ns="pbm/2.0", path="/pbm/sdk"
    )
    pbm_si = pbm.ServiceInstance("ServiceInstance", stub)
    try:
        profile_manager = pbm_si.RetrieveContent().placementSolver
    except vim.fault.NoPermission as exc:
        log.exception(exc)
        raise VMwareApiError(
            f"Not enough permissions. Required privilege: {exc.privilegeId}"
        )
    except vim.fault.VimFault as exc:
        log.exception(exc)
        raise VMwareApiError(exc.msg)
    except vmodl.RuntimeFault as exc:
        log.exception(exc)
        raise VMwareRuntimeError(exc.msg)
    return profile_manager


def get_capability_definitions(profile_manager):
    """
    Returns a list of all capability definitions.

    profile_manager
        Reference to the profile manager.
    """
    res_type = pbm.profile.ResourceType(
        resourceType=pbm.profile.ResourceTypeEnum.STORAGE
    )
    try:
        cap_categories = profile_manager.FetchCapabilityMetadata(res_type)
    except vim.fault.NoPermission as exc:
        log.exception(exc)
        raise VMwareApiError(
            f"Not enough permissions. Required privilege: {exc.privilegeId}"
        )
    except vim.fault.VimFault as exc:
        log.exception(exc)
        raise VMwareApiError(exc.msg)
    except vmodl.RuntimeFault as exc:
        log.exception(exc)
        raise VMwareRuntimeError(exc.msg)
    cap_definitions = []
    for cat in cap_categories:
        cap_definitions.extend(cat.capabilityMetadata)
    return cap_definitions


def get_policies_by_id(profile_manager, policy_ids):
    """
    Returns a list of policies with the specified ids.

    profile_manager
        Reference to the profile manager.

    policy_ids
        List of policy ids to retrieve.
    """
    try:
        return profile_manager.RetrieveContent(policy_ids)
    except vim.fault.NoPermission as exc:
        log.exception(exc)
        raise VMwareApiError(
            f"Not enough permissions. Required privilege: {exc.privilegeId}"
        )
    except vim.fault.VimFault as exc:
        log.exception(exc)
        raise VMwareApiError(exc.msg)
    except vmodl.RuntimeFault as exc:
        log.exception(exc)
        raise VMwareRuntimeError(exc.msg)


def get_storage_policies(profile_manager, policy_names=None, get_all_policies=False):
    """
    Returns a list of the storage policies, filtered by name.

    profile_manager
        Reference to the profile manager.

    policy_names
        List of policy names to filter by.
        Default is None.

    get_all_policies
        Flag specifying to return all policies, regardless of the specified
        filter.
    """
    res_type = pbm.profile.ResourceType(
        resourceType=pbm.profile.ResourceTypeEnum.STORAGE
    )
    try:
        policy_ids = profile_manager.QueryProfile(res_type)
    except vim.fault.NoPermission as exc:
        log.exception(exc)
        raise VMwareApiError(
            f"Not enough permissions. Required privilege: {exc.privilegeId}"
        )
    except vim.fault.VimFault as exc:
        log.exception(exc)
        raise VMwareApiError(exc.msg)
    except vmodl.RuntimeFault as exc:
        log.exception(exc)
        raise VMwareRuntimeError(exc.msg)
    log.trace("policy_ids = %s", policy_ids)
    # More policies are returned so we need to filter again
    policies = [
        p
        for p in get_policies_by_id(profile_manager, policy_ids)
        if p.resourceType.resourceType == pbm.profile.ResourceTypeEnum.STORAGE
    ]
    if get_all_policies:
        return policies
    if not policy_names:
        policy_names = []
    return [p for p in policies if p.name in policy_names]


def create_storage_policy(profile_manager, policy_spec):
    """
    Creates a storage policy.

    profile_manager
        Reference to the profile manager.

    policy_spec
        Policy update spec.
    """
    try:
        profile_manager.Create(policy_spec)
    except vim.fault.NoPermission as exc:
        log.exception(exc)
        raise VMwareApiError(
            f"Not enough permissions. Required privilege: {exc.privilegeId}"
        )
    except vim.fault.VimFault as exc:
        log.exception(exc)
        raise VMwareApiError(exc.msg)
    except vmodl.RuntimeFault as exc:
        log.exception(exc)
        raise VMwareRuntimeError(exc.msg)


def update_storage_policy(profile_manager, policy, policy_spec):
    """
    Updates a storage policy.

    profile_manager
        Reference to the profile manager.

    policy
        Reference to the policy to be updated.

    policy_spec
        Policy update spec.
    """
    try:
        profile_manager.Update(policy.profileId, policy_spec)
    except vim.fault.NoPermission as exc:
        log.exception(exc)
        raise VMwareApiError(
            f"Not enough permissions. Required privilege: {exc.privilegeId}"
        )
    except vim.fault.VimFault as exc:
        log.exception(exc)
        raise VMwareApiError(exc.msg)
    except vmodl.RuntimeFault as exc:
        log.exception(exc)
        raise VMwareRuntimeError(exc.msg)


def get_default_storage_policy_of_datastore(profile_manager, datastore):
    """
    Returns the default storage policy reference assigned to a datastore.

    profile_manager
        Reference to the profile manager.

    datastore
        Reference to the datastore.
    """
    # Retrieve all datastores visible
    hub = pbm.placement.PlacementHub(hubId=datastore._moId, hubType="Datastore")
    log.trace("placement_hub = %s", hub)
    try:
        policy_id = profile_manager.QueryDefaultRequirementProfile(hub)
    except vim.fault.NoPermission as exc:
        log.exception(exc)
        raise VMwareApiError(
            f"Not enough permissions. Required privilege: {exc.privilegeId}"
        )
    except vim.fault.VimFault as exc:
        log.exception(exc)
        raise VMwareApiError(exc.msg)
    except vmodl.RuntimeFault as exc:
        log.exception(exc)
        raise VMwareRuntimeError(exc.msg)
    policy_refs = get_policies_by_id(profile_manager, [policy_id])
    if not policy_refs:
        raise VMwareObjectRetrievalError(
            f"Storage policy with id '{policy_id}' was not found"
        )
    return policy_refs[0]


def assign_default_storage_policy_to_datastore(profile_manager, policy, datastore):
    """
    Assigns a storage policy as the default policy to a datastore.

    profile_manager
        Reference to the profile manager.

    policy
        Reference to the policy to assigned.

    datastore
        Reference to the datastore.
    """
    placement_hub = pbm.placement.PlacementHub(
        hubId=datastore._moId, hubType="Datastore"
    )
    log.trace("placement_hub = %s", placement_hub)
    try:
        profile_manager.AssignDefaultRequirementProfile(
            policy.profileId, [placement_hub]
        )
    except vim.fault.NoPermission as exc:
        log.exception(exc)
        raise VMwareApiError(
            f"Not enough permissions. Required privilege: {exc.privilegeId}"
        )
    except vim.fault.VimFault as exc:
        log.exception(exc)
        raise VMwareApiError(exc.msg)
    except vmodl.RuntimeFault as exc:
        log.exception(exc)
        raise VMwareRuntimeError(exc.msg)