# Copyright 2014 IBM Corporation
# Copyright 2015 Lenovo
#
# 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.

import atexit
import confluentd.exceptions as exc
import confluentd.interface.console as conapi
import confluentd.messages as msg
import eventlet
import eventlet.event
import eventlet.green.threading as threading
import eventlet.greenpool as greenpool
import eventlet.queue as queue
import pyghmi.constants as pygconstants
import pyghmi.exceptions as pygexc
import pyghmi.ipmi.console as console
import pyghmi.ipmi.command as ipmicommand
import socket

console.session.select = eventlet.green.select
console.session.threading = eventlet.green.threading


def exithandler():
    console.session.iothread.join()

atexit.register(exithandler)

_ipmiworkers = greenpool.GreenPool()

_ipmithread = None
_ipmiwaiters = []

sensor_categories = {
    'temperature': frozenset(['Temperature']),
    'power': frozenset(['Current', 'Battery']),
    'fans': frozenset(['Fan', 'Cooling Device']),
}

def hex2bin(hexstring):
    hexvals = hexstring.split(':')
    if len(hexvals) < 2:
        hexvals = hexstring.split(' ')
    if len(hexvals) < 2:
        hexvals = [hexstring[i:i+2] for i in xrange(0, len(hexstring), 2)]
    bytedata = [int(i, 16) for i in hexvals]
    return bytearray(bytedata)

def simplify_name(name):
    return name.lower().replace(' ', '_')


def sanitize_invdata(indata):
    """Sanitize pyghmi data

    pyghmi will return bytearrays when it has no idea what to do.  In our
    case, we will change those to hex strings.  Additionally, ignore 'extra'
    fields if the oem_parser is set
    """
    if 'oem_parser' in indata and indata['oem_parser'] is not None:
        if 'board_extra' in indata:
            del indata['board_extra']
        if 'chassis_extra' in indata:
            del indata['chassis_extra']
        if 'product_extra' in indata:
            del indata['product_extra']
    for k in indata:
        if isinstance(indata[k], bytearray):
            indata[k] = '0x' + ''.join(format(x, '02x') for x in indata[k])
        elif isinstance(indata[k], dict):
            sanitize_invdata(indata[k])
        elif isinstance(indata[k], list):
            for idx, value in enumerate(indata[k]):
                if isinstance(value, bytearray):
                    indata[k][idx] = '0x' + ''.join(
                        format(x, '02x') for x in indata[k][idx])


class IpmiCommandWrapper(ipmicommand.Command):
    def __init__(self, node, cfm, **kwargs):
        self._attribwatcher = cfm.watch_attributes(
            (node,), ('secret.hardwaremanagementuser',
                      'secret.hardwaremanagementpassword', 'secret.ipmikg',
                      'hardwaremanagement.manager'), self._attribschanged)
        super(self.__class__, self).__init__(**kwargs)

    def _attribschanged(self, nodeattribs, configmanager, **kwargs):
        try:
            self.ipmi_session._mark_broken()
        except AttributeError:
            # if ipmi_session doesn't already exist,
            # then do nothing
            pass


def _ipmi_evtloop():
    while True:
        try:
            console.session.Session.wait_for_rsp(timeout=600)
            while _ipmiwaiters:
                waiter = _ipmiwaiters.pop()
                waiter.send()
        except:  # TODO(jbjohnso): log the trace into the log
            import traceback

            traceback.print_exc()


def get_conn_params(node, configdata):
    if 'secret.hardwaremanagementuser' in configdata:
        username = configdata['secret.hardwaremanagementuser']['value']
    else:
        username = 'USERID'
    if 'secret.hardwaremanagementpassword' in configdata:
        passphrase = configdata['secret.hardwaremanagementpassword']['value']
    else:
        passphrase = 'PASSW0RD'  # for lack of a better guess
    if 'hardwaremanagement.manager' in configdata:
        bmc = configdata['hardwaremanagement.manager']['value']
    else:
        bmc = node
    if 'secret.ipmikg' in configdata:
        kg = configdata['secret.ipmikg']['value']
    else:
        kg = passphrase
    # TODO(jbjohnso): check if the end has some number after a : without []
    # for non default port
    return {
        'username': username,
        'passphrase': passphrase,
        'kg': kg,
        'bmc': bmc,
        'port': 623,
    }


_configattributes = ('secret.hardwaremanagementuser',
                     'secret.hardwaremanagementpassword',
                     'secret.ipmikg', 'hardwaremanagement.manager')


def _donothing(data):
    # a dummy function to avoid some awkward exceptions from
    # zombie pyghmi console objects
    pass


class IpmiConsole(conapi.Console):
    configattributes = frozenset(_configattributes)

    def __init__(self, node, config):
        self.error = None
        self.datacallback = None
        crypt = config.decrypt
        self.solconnection = None
        config.decrypt = True
        self.broken = False
        configdata = config.get_node_attributes([node], _configattributes)
        connparams = get_conn_params(node, configdata[node])
        config.decrypt = crypt
        self.username = connparams['username']
        self.password = connparams['passphrase']
        self.kg = connparams['kg']
        self.bmc = connparams['bmc']
        self.port = connparams['port']
        self.connected = False
        # Cannot actually create console until 'connect', when we get callback

    def __del__(self):
        self.solconnection = None

    def handle_data(self, data):
        if type(data) == dict:
            if 'error' in data:
                self.solconnection = None
                self.broken = True
                self.error = data['error']
                if self.connected:
                    self.datacallback(conapi.ConsoleEvent.Disconnect)
        else:
            self.datacallback(data)

    def connect(self, callback):
        self.datacallback = callback
        # we provide a weak reference to pyghmi as otherwise we'd
        # have a circular reference and reference counting would never get
        # out...
        try:
            self.solconnection = console.Console(bmc=self.bmc, port=self.port,
                                                 userid=self.username,
                                                 password=self.password,
                                                 kg=self.kg, force=True,
                                                 iohandler=self.handle_data)
            while not self.solconnection.connected and not self.broken:
                w = eventlet.event.Event()
                _ipmiwaiters.append(w)
                w.wait()
                if self.broken:
                    break
            if self.broken:
                if (self.error.startswith('Incorrect password') or
                        self.error.startswith('Unauthorized name')):
                    raise exc.TargetEndpointBadCredentials
                else:
                    raise exc.TargetEndpointUnreachable(self.error)
            self.connected = True
        except socket.gaierror as err:
            raise exc.TargetEndpointUnreachable(str(err))

    def close(self):
        if self.solconnection is not None:
            # break the circular reference here
            self.solconnection.out_handler = _donothing
            self.solconnection.close()
        self.solconnection = None
        self.broken = True
        self.error = "closed"

    def write(self, data):
        self.solconnection.send_data(data)

    def send_break(self):
        self.solconnection.send_break()


def perform_requests(operator, nodes, element, cfg, inputdata):
    cryptit = cfg.decrypt
    cfg.decrypt = True
    configdata = cfg.get_node_attributes(nodes, _configattributes)
    cfg.decrypt = cryptit
    resultdata = queue.LightQueue()
    pendingnum = len(nodes)
    for node in nodes:
        _ipmiworkers.spawn_n(
            perform_request, operator, node, element, configdata, inputdata,
            cfg, resultdata)
    while pendingnum:
        datum = resultdata.get()
        if datum == 'Done':
            pendingnum -= 1
        else:
            yield datum


def perform_request(operator, node, element,
                    configdata, inputdata, cfg, results):
        try:
            return IpmiHandler(operator, node, element, configdata, inputdata,
                               cfg, results).handle_request()
        except pygexc.IpmiException as ipmiexc:
            excmsg = str(ipmiexc)
            if excmsg == 'Session no longer connected':
                results.put(msg.ConfluentTargetTimeout(node))
            else:
                results.put(msg.ConfluentNodeError(node, excmsg))
                raise
        except exc.TargetEndpointUnreachable as tu:
            results.put(msg.ConfluentTargetTimeout(node, str(tu)))
        except Exception as e:
            results.put(msg.ConfluentNodeError(
                node, 'IPMI PluginException (see stderr log): ' + str(e)))
            raise
        finally:
            results.put('Done')

persistent_ipmicmds = {}

class IpmiHandler(object):
    def __init__(self, operation, node, element, cfd, inputdata, cfg, output):
        self.sensormap = {}
        self.invmap = {}
        self.output = output
        self.sensorcategory = None
        self.broken = False
        self.error = None
        eventlet.sleep(0)
        self.cfg = cfd[node]
        self.loggedin = False
        self.node = node
        self.element = element
        self.op = operation
        connparams = get_conn_params(node, self.cfg)
        self.ipmicmd = None
        self.inputdata = inputdata
        tenant = cfg.tenant
        self._logevt = None
        if ((node, tenant) not in persistent_ipmicmds or
                not persistent_ipmicmds[(node, tenant)].ipmi_session.logged):
            self._logevt = threading.Event()
            try:
                persistent_ipmicmds[(node, tenant)] = IpmiCommandWrapper(
                    node, cfg, bmc=connparams['bmc'],
                    userid=connparams['username'],
                    password=connparams['passphrase'], kg=connparams['kg'],
                    port=connparams['port'], onlogon=self.logged)
            except socket.gaierror as ge:
                if ge[0] == -2:
                    raise exc.TargetEndpointUnreachable(ge[1])
        self.ipmicmd = persistent_ipmicmds[(node, tenant)]

    bootdevices = {
        'optical': 'cd'
    }

    def logged(self, response, ipmicmd):
        if 'error' in response:
            self.broken = True
            self.error = response['error']
        else:
            self.loggedin = True
        self._logevt.set()

    def handle_request(self):
        if self._logevt is not None:
            self._logevt.wait()
        self._logevt = None
        if self.broken:
            if (self.error == 'timeout' or
                    'Insufficient resources' in self.error):
                self.error = self.error.replace(' reported in RAKP4', '')
                self.output.put(msg.ConfluentTargetTimeout(
                    self.node, self.error))
                return
            elif ('Unauthorized' in self.error or
                    'Incorrect password' in self.error):
                self.output.put(
                    msg.ConfluentTargetInvalidCredentials(self.node))
                return
            else:
                raise Exception(self.error)
        if self.element == ['power', 'state']:
            self.power()
        elif self.element == ['boot', 'nextdevice']:
            self.bootdevice()
        elif self.element == ['health', 'hardware']:
            self.health()
        elif self.element == ['identify']:
            self.identify()
        elif self.element[0] == 'sensors':
            self.handle_sensors()
        elif self.element[0] == 'configuration':
            self.handle_configuration()
        elif self.element[0] == 'inventory':
            self.handle_inventory()
        elif self.element == ['events', 'hardware', 'log']:
            self.do_eventlog()
        elif self.element == ['events', 'hardware', 'decode']:
            self.decode_alert()
        else:
            raise Exception('Not Implemented')

    def handle_configuration(self):
        if self.element[1:3] == ['management_controller', 'alerts']:
            return self.handle_alerts()
        elif self.element[1:3] == ['management_controller', 'users']:
            return self.handle_users()
        elif self.element[1:3] == ['management_controller', 'net_interfaces']:
            return self.handle_nets()
        elif self.element[1:3] == ['management_controller', 'reset']:
            return self.handle_reset()
        elif self.element[1:3] == ['management_controller', 'identifier']:
            return self.handle_identifier()
        raise Exception('Not implemented')

    def decode_alert(self):
        inputdata = self.inputdata.get_alert(self.node)
        specifictrap = int(inputdata['.1.3.6.1.6.3.1.1.4.1.0'].rpartition(
            '.')[-1])
        for tmpvarbind in inputdata:
            if tmpvarbind.endswith('3183.1.1'):
                varbinddata = inputdata[tmpvarbind]
        varbinddata = hex2bin(varbinddata)
        event = self.ipmicmd.decode_pet(specifictrap, varbinddata)
        self.pyghmi_event_to_confluent(event)
        self.output.put(msg.EventCollection((event,), name=self.node))

    def handle_alerts(self):
        if self.element[3] == 'destinations':
            if len(self.element) == 4:
                # A list of destinations
                maxdest = self.ipmicmd.get_alert_destination_count()
                for alertidx in xrange(0, maxdest + 1):
                    self.output.put(msg.ChildCollection(alertidx))
                return
            elif len(self.element) == 5:
                alertidx = int(self.element[-1])
                if self.op == 'read':
                    destdata = self.ipmicmd.get_alert_destination(alertidx)
                    self.output.put(msg.AlertDestination(
                        ip=destdata['address'],
                        acknowledge=destdata['acknowledge_required'],
                        retries=destdata['retries'],
                        name=self.node))
                    return
                elif self.op == 'update':
                    alertparms = self.inputdata.alert_params_by_node(
                        self.node)
                    alertargs = {}
                    if 'acknowledge' in alertparms:
                        alertargs['acknowledge_required'] = alertparms['acknowledge']
                    if 'ip' in alertparms:
                        alertargs['ip'] = alertparms['ip']
                    if 'retries' in alertparms:
                        alertargs['retries'] = alertparms['retries']
                    self.ipmicmd.set_alert_destination(destination=alertidx,
                                                       **alertargs)
                    return
                elif self.op == 'delete':
                    self.ipmicmd.clear_alert_destination(alertidx)
                    return
        raise Exception('Not implemented')

    def handle_nets(self):
        if len(self.element) == 3:
            if self.op != 'read':
                self.output.put(
                    msg.ConfluentNodeError(self.node, 'Unsupported operation'))
                return
            self.output.put(msg.ChildCollection('management'))
        elif len(self.element) == 4 and self.element[-1] == 'management':
            if self.op == 'read':
                lancfg = self.ipmicmd.get_net_configuration()
                self.output.put(msg.NetworkConfiguration(
                    self.node, ipv4addr=lancfg['ipv4_address'],
                    ipv4gateway=lancfg['ipv4_gateway'],
                    ipv4cfgmethod=lancfg['ipv4_configuration'],
                    hwaddr=lancfg['mac_address']
                ))
            else:
                self.output.put(msg.ConfluentNodeError(self.node,
                                                       'Not yet implemented'))

    def handle_users(self):
        # Create user
        if len(self.element) == 3:
            if self.op == 'update':
                user = self.inputdata.credentials[self.node]
                self.ipmicmd.create_user(uid=user['uid'], name=user['username'],
                                    password=user['password'],
                                    callback=True,link_auth=True, ipmi_msg=True,
                                    privilege_level=user['privilege_level'])
            # A list of users
            self.output.put(msg.ChildCollection('all'))
            for user in self.ipmicmd.get_users():
                self.output.put(msg.ChildCollection(user, candelete=True))
            return
        # List all users
        elif len(self.element) == 4 and self.element[-1] == 'all':
            users = []
            for user in self.ipmicmd.get_users():
                users.append(self.ipmicmd.get_user(uid=user))
            self.output.put(msg.UserCollection(users=users, name=self.node))
            return
        # Update user
        elif len(self.element) == 4:
            user = int(self.element[-1])
            if self.op == 'read':
                data = self.ipmicmd.get_user(uid=user)
                self.output.put(msg.User(
                    uid=data['uid'],
                    username=data['name'],
                    privilege_level=data['access']['privilege_level'],
                    name=self.node))
                return
            elif self.op == 'update':
                user = self.inputdata.credentials[self.node]

                if 'username' in user:
                    self.ipmicmd.set_user_name(uid=user['uid'],
                                               name=user['username'])
                if 'privilege_level' in user:
                    self.ipmicmd.set_user_access(uid=user['uid'],
                                    privilege_level=user['privilege_level'])
                if 'password' in user:
                    self.ipmicmd.set_user_password(uid=user['uid'],
                                                   password=user['password'])
                    self.ipmicmd.set_user_password(uid=user['uid'],
                                    mode='enable', password=user['password'])
                if 'enabled' in user:
                    if user['enabled'] == 'yes':
                        mode = 'enable'
                    else:
                        mode = 'disable'
                    self.ipmicmd.disable_user(user['uid'], mode)
                return
            elif self.op == 'delete':
                self.ipmicmd.user_delete(uid=user)
                return

    def do_eventlog(self):
        eventout = []
        clear = False
        if self.op == 'delete':
            clear = True
        for event in self.ipmicmd.get_event_log(clear):
            self.pyghmi_event_to_confluent(event)
            eventout.append(event)
        self.output.put(msg.EventCollection(eventout, name=self.node))

    def pyghmi_event_to_confluent(self, event):
        event['severity'] = _str_health(event.get('severity', 'unknown'))
        if 'event_data' in event:
            event['event'] = '{0} - {1}'.format(
                event['event'], event['event_data'])
        if 'event_id' in event:
            event['id'] = '{0}.{1}'.format(event['event_id'],
                                           event['component_type_id'])

    def make_inventory_map(self):
        invnames = self.ipmicmd.get_inventory_descriptions()
        for name in invnames:
            self.invmap[simplify_name(name)] = name

    def make_sensor_map(self, sensors=None):
        if sensors is None:
            sensors = self.ipmicmd.get_sensor_descriptions()
        for sensor in sensors:
            resourcename = sensor['name']
            self.sensormap[simplify_name(resourcename)] = resourcename

    def read_sensors(self, sensorname):
        try:
            if sensorname == 'all':
                sensors = self.ipmicmd.get_sensor_descriptions()
                readings = []
                for sensor in filter(self.match_sensor, sensors):
                    try:
                        reading = self.ipmicmd.get_sensor_reading(
                            sensor['name'])
                    except pygexc.IpmiException as ie:
                        if ie.ipmicode == 203:
                            continue
                        raise
                    if hasattr(reading, 'health'):
                        reading.health = _str_health(reading.health)
                    readings.append(reading)
                self.output.put(msg.SensorReadings(readings, name=self.node))
            else:
                self.make_sensor_map()
                if sensorname not in self.sensormap:
                    self.output.put(
                        msg.ConfluentTargetNotFound(self.node,
                                                    'Sensor not found'))
                    return
                reading = self.ipmicmd.get_sensor_reading(
                    self.sensormap[sensorname])
                if hasattr(reading, 'health'):
                    reading.health = _str_health(reading.health)
                self.output.put(
                    msg.SensorReadings([reading],
                                       name=self.node))
        except pygexc.IpmiException:
            self.output.put(msg.ConfluentTargetTimeout(self.node))

    def list_inventory(self):
        try:
            components = self.ipmicmd.get_inventory_descriptions()
        except pygexc.IpmiException:
            self.output.put(msg.ConfluentTargetTimeout(self.node))
            return
        self.output.put(msg.ChildCollection('all'))
        for component in components:
            self.output.put(msg.ChildCollection(simplify_name(component)))

    def list_firmware(self):
        self.output.put(msg.ChildCollection('all'))
        for id, data in self.ipmicmd.get_firmware():
            self.output.put(msg.ChildCollection(simplify_name(id)))

    def read_firmware(self, component):
        items = []
        for id, data in self.ipmicmd.get_firmware():
            if component == 'all' or component == simplify_name(id):
                items.append({id: data})
        self.output.put(msg.Firmware(items, self.node))

    def handle_inventory(self):
        if self.element[1] == 'firmware':
            if len(self.element) == 3:
                return self.list_firmware()
            elif len(self.element) == 4:
                return self.read_firmware(self.element[-1])
        elif self.element[1] == 'hardware':
            if len(self.element) == 3:  # list things in inventory
                return self.list_inventory()
            elif len(self.element) == 4:  # actually read inventory data
                return self.read_inventory(self.element[-1])
        raise Exception('Unsupported scenario...')

    def list_leds(self):
        self.output.put(msg.ChildCollection('all'))
        for category, info in self.ipmicmd.get_leds():
            self.output.put(msg.ChildCollection(simplify_name(category)))

    def read_leds(self, component):
        led_categories = []
        for category, info in self.ipmicmd.get_leds():
            if component == 'all' or component == simplify_name(category):
                led_categories.append({category: info})
        self.output.put(msg.LEDStatus(led_categories, self.node))

    def read_inventory(self, component):
        invitems = []
        if component == 'all':
            for invdata in self.ipmicmd.get_inventory():
                if invdata[1] is None:
                    newinf = {'present': False, 'information': None}
                else:
                    sanitize_invdata(invdata[1])
                    newinf = {'present': True, 'information': invdata[1]}
                newinf['name'] = invdata[0]
                invitems.append(newinf)
        else:
            self.make_inventory_map()
            compname = self.invmap.get(component, None)
            if compname is None:
                self.output.put(msg.ConfluentTargetNotFound())
                return
            invdata = self.ipmicmd.get_inventory_of_component(compname)
            if invdata is None:
                newinf = {'present': False, 'information': None}
            else:
                sanitize_invdata(invdata)
                newinf = {'present': True, 'information': invdata}
            newinf['name'] = compname
            invitems.append(newinf)
        newinvdata = {'inventory': invitems}
        self.output.put(msg.KeyValueData(newinvdata, self.node))

    def handle_sensors(self):
        if self.element[-1] == '':
            self.element = self.element[:-1]
        if len(self.element) < 3:
            return
        self.sensorcategory = self.element[2]
        # list sensors per category
        if len(self.element) == 3 and self.element[-2] == 'hardware':
            return self.list_sensors()
        elif len(self.element) == 3 and self.element[-2] == 'led':
            return self.list_leds()
        elif len(self.element) == 4 and self.element[1] == 'led':
            return self.read_leds(self.element[-1])
        elif len(self.element) == 4:  # resource requested
            return self.read_sensors(self.element[-1])

    def match_sensor(self, sensor):
        if self.sensorcategory == 'all':
            return True
        if sensor['type'] in sensor_categories[self.sensorcategory]:
            return True
        return False

    def list_sensors(self):
        try:
            sensors = self.ipmicmd.get_sensor_descriptions()
        except pygexc.IpmiException:
            self.output.put(msg.ConfluentTargetTimeout(self.node))
            return
        self.output.put(msg.ChildCollection('all'))
        for sensor in filter(self.match_sensor, sensors):
            self.output.put(msg.ChildCollection(simplify_name(sensor['name'])))

    def health(self):
        if 'read' == self.op:
            try:
                response = self.ipmicmd.get_health()
            except pygexc.IpmiException:
                self.output.put(msg.ConfluentTargetTimeout(self.node))
                return
            health = response['health']
            health = _str_health(health)
            self.output.put(msg.HealthSummary(health, self.node))
            if 'badreadings' in response:
                badsensors = []
                for reading in response['badreadings']:
                    if hasattr(reading, 'health'):
                        reading.health = _str_health(reading.health)
                    badsensors.append(reading)
                self.output.put(msg.SensorReadings(badsensors, name=self.node))
        else:
            raise exc.InvalidArgumentException('health is read-only')

    def bootdevice(self):
        if 'read' == self.op:
            bootdev = self.ipmicmd.get_bootdev()
            if bootdev['bootdev'] in self.bootdevices:
                bootdev['bootdev'] = self.bootdevices[bootdev['bootdev']]
            bootmode = 'unspecified'
            if 'uefimode' in bootdev:
                if bootdev['uefimode']:
                    bootmode = 'uefi'
                else:
                    bootmode = 'bios'
            self.output.put(msg.BootDevice(node=self.node,
                                           device=bootdev['bootdev'],
                                           bootmode=bootmode))
            return
        elif 'update' == self.op:
            bootdev = self.inputdata.bootdevice(self.node)
            douefi = False
            if self.inputdata.bootmode(self.node) == 'uefi':
                douefi = True
            bootdev = self.ipmicmd.set_bootdev(bootdev, uefiboot=douefi)
            if bootdev['bootdev'] in self.bootdevices:
                bootdev['bootdev'] = self.bootdevices[bootdev['bootdev']]
            self.output.put(msg.BootDevice(node=self.node,
                                           device=bootdev['bootdev']))

    def identify(self):
        if 'update' == self.op:
            identifystate = self.inputdata.inputbynode[self.node] == 'on'
            self.ipmicmd.set_identify(on=identifystate)
            self.output.put(msg.IdentifyState(
                node=self.node, state=self.inputdata.inputbynode[self.node]))
            return
        elif 'read' == self.op:
            # ipmi has identify as read-only for now
            self.output.put(msg.IdentifyState(node=self.node, state=''))
            return

    def power(self):
        if 'read' == self.op:
            power = self.ipmicmd.get_power()
            self.output.put(msg.PowerState(node=self.node,
                                           state=power['powerstate']))
            return
        elif 'update' == self.op:
            powerstate = self.inputdata.powerstate(self.node)
            self.ipmicmd.set_power(powerstate, wait=30)
            power = self.ipmicmd.get_power()
            self.output.put(msg.PowerState(node=self.node,
                                           state=power['powerstate']))
            return

    def handle_reset(self):
        if 'read' == self.op:
            self.output.put(msg.BMCReset(node=self.node,
                                         state='reset'))
            return
        elif 'update' == self.op:
            self.ipmicmd.reset_bmc()
            return

    def handle_identifier(self):
        if 'read' == self.op:
            mci = self.ipmicmd.get_mci()
            self.output.put(msg.MCI(self.node, mci))
            return
        elif 'update' == self.op:
            mci = self.inputdata.mci(self.node)
            self.ipmicmd.set_mci(mci)
            return

def _str_health(health):
    if health == 'unknown':
        return health
    if pygconstants.Health.Failed & health:
        health = 'failed'
    elif pygconstants.Health.Critical & health:
        health = 'critical'
    elif pygconstants.Health.Warning & health:
        health = 'warning'
    else:
        health = 'ok'
    return health


def initthread():
    global _ipmithread
    if _ipmithread is None:
        _ipmithread = eventlet.spawn(_ipmi_evtloop)


def create(nodes, element, configmanager, inputdata):
    initthread()
    if element == ['_console', 'session']:
        if len(nodes) > 1:
            raise Exception("_console/session does not support multiple nodes")
        return IpmiConsole(nodes[0], configmanager)
    else:
        return perform_requests(
            'update', nodes, element, configmanager, inputdata)


def update(nodes, element, configmanager, inputdata):
    initthread()
    return create(nodes, element, configmanager, inputdata)


def retrieve(nodes, element, configmanager, inputdata):
    initthread()
    return perform_requests('read', nodes, element, configmanager, inputdata)

def delete(nodes, element, configmanager, inputdata):
    initthread()
    return perform_requests(
        'delete', nodes, element, configmanager, inputdata)