# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# Copyright 2011 Justin Santa Barbara
# All Rights Reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

"""Generic Node base class for all workers that run on hosts."""


import inspect
import os
import random

from oslo.config import cfg
from oslo.db import exception as db_exc
from oslo import messaging
import osprofiler.notifier
from osprofiler import profiler
import osprofiler.web

from cinder import context
from cinder import db
from cinder import exception
from cinder.i18n import _
from cinder.openstack.common import importutils
from cinder.openstack.common import log as logging
from cinder.openstack.common import loopingcall
from cinder.openstack.common import processutils
from cinder.openstack.common import service
from cinder import rpc
from cinder import version
from cinder import wsgi


LOG = logging.getLogger(__name__)

service_opts = [
    cfg.IntOpt('report_interval',
               default=10,
               help='Interval, in seconds, between nodes reporting state '
                    'to datastore'),
    cfg.IntOpt('periodic_interval',
               default=60,
               help='Interval, in seconds, between running periodic tasks'),
    cfg.IntOpt('periodic_fuzzy_delay',
               default=60,
               help='Range, in seconds, to randomly delay when starting the'
                    ' periodic task scheduler to reduce stampeding.'
                    ' (Disable by setting to 0)'),
    cfg.StrOpt('osapi_volume_listen',
               default="0.0.0.0",
               help='IP address on which OpenStack Volume API listens'),
    cfg.IntOpt('osapi_volume_listen_port',
               default=8776,
               help='Port on which OpenStack Volume API listens'),
    cfg.IntOpt('osapi_volume_workers',
               help='Number of workers for OpenStack Volume API service. '
                    'The default is equal to the number of CPUs available.'), ]

profiler_opts = [
    cfg.BoolOpt("profiler_enabled", default=False,
                help=_('If False fully disable profiling feature.')),
    cfg.BoolOpt("trace_sqlalchemy", default=False,
                help=_("If False doesn't trace SQL requests."))
]

CONF = cfg.CONF
CONF.register_opts(service_opts)
CONF.register_opts(profiler_opts, group="profiler")


def setup_profiler(binary, host):
    if CONF.profiler.profiler_enabled:
        _notifier = osprofiler.notifier.create(
            "Messaging", messaging, context.get_admin_context().to_dict(),
            rpc.TRANSPORT, "cinder", binary, host)
        osprofiler.notifier.set(_notifier)
        LOG.warning("OSProfiler is enabled.\nIt means that person who knows "
                    "any of hmac_keys that are specified in "
                    "/etc/cinder/api-paste.ini can trace his requests. \n"
                    "In real life only operator can read this file so there "
                    "is no security issue. Note that even if person can "
                    "trigger profiler, only admin user can retrieve trace "
                    "information.\n"
                    "To disable OSprofiler set in cinder.conf:\n"
                    "[profiler]\nenabled=false")
    else:
        osprofiler.web.disable()


class Service(service.Service):
    """Service object for binaries running on hosts.

    A service takes a manager and enables rpc by listening to queues based
    on topic. It also periodically runs tasks on the manager and reports
    it state to the database services table.
    """

    def __init__(self, host, binary, topic, manager, report_interval=None,
                 periodic_interval=None, periodic_fuzzy_delay=None,
                 service_name=None, *args, **kwargs):
        super(Service, self).__init__()

        if not rpc.initialized():
            rpc.init(CONF)

        self.host = host
        self.binary = binary
        self.topic = topic
        self.manager_class_name = manager
        manager_class = importutils.import_class(self.manager_class_name)
        manager_class = profiler.trace_cls("rpc")(manager_class)

        self.manager = manager_class(host=self.host,
                                     service_name=service_name,
                                     *args, **kwargs)
        self.report_interval = report_interval
        self.periodic_interval = periodic_interval
        self.periodic_fuzzy_delay = periodic_fuzzy_delay
        self.basic_config_check()
        self.saved_args, self.saved_kwargs = args, kwargs
        self.timers = []

        setup_profiler(binary, host)

    def start(self):
        version_string = version.version_string()
        LOG.info(_('Starting %(topic)s node (version %(version_string)s)'),
                 {'topic': self.topic, 'version_string': version_string})
        self.model_disconnected = False
        self.manager.init_host()
        ctxt = context.get_admin_context()
        try:
            service_ref = db.service_get_by_args(ctxt,
                                                 self.host,
                                                 self.binary)
            self.service_id = service_ref['id']
        except exception.NotFound:
            self._create_service_ref(ctxt)

        LOG.debug("Creating RPC server for service %s" % self.topic)

        target = messaging.Target(topic=self.topic, server=self.host)
        endpoints = [self.manager]
        endpoints.extend(self.manager.additional_endpoints)
        self.rpcserver = rpc.get_server(target, endpoints)
        self.rpcserver.start()

        if self.report_interval:
            pulse = loopingcall.FixedIntervalLoopingCall(
                self.report_state)
            pulse.start(interval=self.report_interval,
                        initial_delay=self.report_interval)
            self.timers.append(pulse)

        if self.periodic_interval:
            if self.periodic_fuzzy_delay:
                initial_delay = random.randint(0, self.periodic_fuzzy_delay)
            else:
                initial_delay = None

            periodic = loopingcall.FixedIntervalLoopingCall(
                self.periodic_tasks)
            periodic.start(interval=self.periodic_interval,
                           initial_delay=initial_delay)
            self.timers.append(periodic)

    def basic_config_check(self):
        """Perform basic config checks before starting service."""
        # Make sure report interval is less than service down time
        if self.report_interval:
            if CONF.service_down_time <= self.report_interval:
                new_down_time = int(self.report_interval * 2.5)
                LOG.warn(_("Report interval must be less than service down "
                           "time. Current config service_down_time: "
                           "%(service_down_time)s, report_interval for this: "
                           "service is: %(report_interval)s. Setting global "
                           "service_down_time to: %(new_down_time)s") %
                         {'service_down_time': CONF.service_down_time,
                          'report_interval': self.report_interval,
                          'new_down_time': new_down_time})
                CONF.set_override('service_down_time', new_down_time)

    def _create_service_ref(self, context):
        zone = CONF.storage_availability_zone
        service_ref = db.service_create(context,
                                        {'host': self.host,
                                         'binary': self.binary,
                                         'topic': self.topic,
                                         'report_count': 0,
                                         'availability_zone': zone})
        self.service_id = service_ref['id']

    def __getattr__(self, key):
        manager = self.__dict__.get('manager', None)
        return getattr(manager, key)

    @classmethod
    def create(cls, host=None, binary=None, topic=None, manager=None,
               report_interval=None, periodic_interval=None,
               periodic_fuzzy_delay=None, service_name=None):
        """Instantiates class and passes back application object.

        :param host: defaults to CONF.host
        :param binary: defaults to basename of executable
        :param topic: defaults to bin_name - 'cinder-' part
        :param manager: defaults to CONF.<topic>_manager
        :param report_interval: defaults to CONF.report_interval
        :param periodic_interval: defaults to CONF.periodic_interval
        :param periodic_fuzzy_delay: defaults to CONF.periodic_fuzzy_delay

        """
        if not host:
            host = CONF.host
        if not binary:
            binary = os.path.basename(inspect.stack()[-1][1])
        if not topic:
            topic = binary
        if not manager:
            subtopic = topic.rpartition('cinder-')[2]
            manager = CONF.get('%s_manager' % subtopic, None)
        if report_interval is None:
            report_interval = CONF.report_interval
        if periodic_interval is None:
            periodic_interval = CONF.periodic_interval
        if periodic_fuzzy_delay is None:
            periodic_fuzzy_delay = CONF.periodic_fuzzy_delay
        service_obj = cls(host, binary, topic, manager,
                          report_interval=report_interval,
                          periodic_interval=periodic_interval,
                          periodic_fuzzy_delay=periodic_fuzzy_delay,
                          service_name=service_name)

        return service_obj

    def kill(self):
        """Destroy the service object in the datastore."""
        self.stop()
        try:
            db.service_destroy(context.get_admin_context(), self.service_id)
        except exception.NotFound:
            LOG.warn(_('Service killed that has no database entry'))

    def stop(self):
        # Try to shut the connection down, but if we get any sort of
        # errors, go ahead and ignore them.. as we're shutting down anyway
        try:
            self.rpcserver.stop()
        except Exception:
            pass
        for x in self.timers:
            try:
                x.stop()
            except Exception:
                pass
        self.timers = []
        super(Service, self).stop()

    def wait(self):
        for x in self.timers:
            try:
                x.wait()
            except Exception:
                pass

    def periodic_tasks(self, raise_on_error=False):
        """Tasks to be run at a periodic interval."""
        ctxt = context.get_admin_context()
        self.manager.periodic_tasks(ctxt, raise_on_error=raise_on_error)

    def report_state(self):
        """Update the state of this service in the datastore."""
        ctxt = context.get_admin_context()
        zone = CONF.storage_availability_zone
        state_catalog = {}
        try:
            try:
                service_ref = db.service_get(ctxt, self.service_id)
            except exception.NotFound:
                LOG.debug('The service database object disappeared, '
                          'Recreating it.')
                self._create_service_ref(ctxt)
                service_ref = db.service_get(ctxt, self.service_id)

            state_catalog['report_count'] = service_ref['report_count'] + 1
            if zone != service_ref['availability_zone']:
                state_catalog['availability_zone'] = zone

            db.service_update(ctxt,
                              self.service_id, state_catalog)

            # TODO(termie): make this pattern be more elegant.
            if getattr(self, 'model_disconnected', False):
                self.model_disconnected = False
                LOG.error(_('Recovered model server connection!'))

        except db_exc.DBConnectionError:
            if not getattr(self, 'model_disconnected', False):
                self.model_disconnected = True
                LOG.exception(_('model server went away'))


class WSGIService(object):
    """Provides ability to launch API from a 'paste' configuration."""

    def __init__(self, name, loader=None):
        """Initialize, but do not start the WSGI server.

        :param name: The name of the WSGI server given to the loader.
        :param loader: Loads the WSGI application using the given name.
        :returns: None

        """
        self.name = name
        self.manager = self._get_manager()
        self.loader = loader or wsgi.Loader()
        self.app = self.loader.load_app(name)
        self.host = getattr(CONF, '%s_listen' % name, "0.0.0.0")
        self.port = getattr(CONF, '%s_listen_port' % name, 0)
        self.workers = (getattr(CONF, '%s_workers' % name, None) or
                        processutils.get_worker_count())
        if self.workers and self.workers < 1:
            worker_name = '%s_workers' % name
            msg = (_("%(worker_name)s value of %(workers)d is invalid, "
                     "must be greater than 0.") %
                   {'worker_name': worker_name,
                    'workers': self.workers})
            raise exception.InvalidInput(msg)
        setup_profiler(name, self.host)

        self.server = wsgi.Server(name,
                                  self.app,
                                  host=self.host,
                                  port=self.port)

    def _get_manager(self):
        """Initialize a Manager object appropriate for this service.

        Use the service name to look up a Manager subclass from the
        configuration and initialize an instance. If no class name
        is configured, just return None.

        :returns: a Manager instance, or None.

        """
        fl = '%s_manager' % self.name
        if fl not in CONF:
            return None

        manager_class_name = CONF.get(fl, None)
        if not manager_class_name:
            return None

        manager_class = importutils.import_class(manager_class_name)
        return manager_class()

    def start(self):
        """Start serving this service using loaded configuration.

        Also, retrieve updated port number in case '0' was passed in, which
        indicates a random port should be used.

        :returns: None

        """
        if self.manager:
            self.manager.init_host()
        self.server.start()
        self.port = self.server.port

    def stop(self):
        """Stop serving this API.

        :returns: None

        """
        self.server.stop()

    def wait(self):
        """Wait for the service to stop serving this API.

        :returns: None

        """
        self.server.wait()

    def reset(self):
        """Reset server greenpool size to default.

        :returns: None

        """
        self.server.reset()


def process_launcher():
    return service.ProcessLauncher()


# NOTE(vish): the global launcher is to maintain the existing
#             functionality of calling service.serve +
#             service.wait
_launcher = None


def serve(server, workers=None):
    global _launcher
    if _launcher:
        raise RuntimeError(_('serve() can only be called once'))

    _launcher = service.launch(server, workers=workers)


def wait():
    LOG.debug('Full set of CONF:')
    for flag in CONF:
        flag_get = CONF.get(flag, None)
        # hide flag contents from log if contains a password
        # should use secret flag when switch over to openstack-common
        if ("_password" in flag or "_key" in flag or
                (flag == "sql_connection" and
                    ("mysql:" in flag_get or "postgresql:" in flag_get))):
            LOG.debug('%s : FLAG SET ' % flag)
        else:
            LOG.debug('%(flag)s : %(flag_get)s' %
                      {'flag': flag, 'flag_get': flag_get})
    try:
        _launcher.wait()
    except KeyboardInterrupt:
        _launcher.stop()
    rpc.cleanup()


class Launcher(object):
    def __init__(self):
        self.launch_service = serve
        self.wait = wait


def get_launcher():
    # Note(lpetrut): ProcessLauncher uses green pipes which fail on Windows
    # due to missing support of non-blocking I/O pipes. For this reason, the
    # service must be spawned differently on Windows, using the ServiceLauncher
    # class instead.
    if os.name == 'nt':
        return Launcher()
    else:
        return process_launcher()
