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"""
Module for OpenStack Management

:codeauthor:    Konrad Mosoń <mosonkonrad@gmail.com>
:maturity:      new
:depends:       openstack-utils
:platform:      linux
"""

import logging
import os.path

import salt.utils.files
import salt.utils.stringutils

log = logging.getLogger(__name__)

# Define the module's virtual name
__virtualname__ = "openstack_mng"


def __virtual__():
    """
    Only load this module if openstack-service is installed
    """
    if os.path.isfile("/usr/bin/openstack-service"):
        return __virtualname__
    else:
        return (False, "The openstack-service binary could not be found.")


def start_service(service_name):
    """
    Start OpenStack service immediately

    CLI Example:

    .. code-block:: bash

        salt '*' openstack_mng.start_service neutron
    """

    os_cmd = ["/usr/bin/openstack-service", "start", service_name]
    return __salt__["cmd.retcode"](os_cmd) == 0


def stop_service(service_name):
    """
    Stop OpenStack service immediately

    CLI Example:

    .. code-block:: bash

        salt '*' openstack_mng.stop_service neutron
    """

    os_cmd = ["/usr/bin/openstack-service", "stop", service_name]
    return __salt__["cmd.retcode"](os_cmd) == 0


def restart_service(service_name, minimum_running_time=None):
    """
    Restart OpenStack service immediately, or only if it's running longer than
    specified value

    CLI Example:

    .. code-block:: bash

        salt '*' openstack_mng.restart_service neutron
        salt '*' openstack_mng.restart_service neutron minimum_running_time=600
    """

    if minimum_running_time:
        ret_code = False
        # get system services list for interesting openstack service
        services = __salt__["cmd.run"](
            ["/usr/bin/openstack-service", "list", service_name]
        ).split("\n")
        for service in services:
            service_info = __salt__["service.show"](service)
            with salt.utils.files.fopen("/proc/uptime") as rfh:
                boot_time = float(
                    salt.utils.stringutils.to_unicode(rfh.read()).split(" ")[0]
                )

            expr_time = (
                int(service_info.get("ExecMainStartTimestampMonotonic", 0)) / 1000000
                < boot_time - minimum_running_time
            )
            expr_active = service_info.get("ActiveState") == "active"

            if expr_time or not expr_active:
                # restart specific system service
                ret = __salt__["service.restart"](service)
                if ret:
                    ret_code = True

        return ret_code
    else:
        # just restart
        os_cmd = ["/usr/bin/openstack-service", "restart", service_name]
        return __salt__["cmd.retcode"](os_cmd) == 0