#!/usr/bin/env python
# -*- coding: utf-8 -*-


import json
import time
from IPy import IP
import jimit as ji

from models import Database as db, Config, CPUMemory, Traffic, DiskIO
from models import Guest
from models import Disk
from models import Log
from models import Utils
from models import EmitKind
from models import ResponseState, GuestState, DiskState
from models.guest import GuestMigrateInfo
from models.initialize import app, logger
from models.status import CollectionPerformanceDataKind, HostCollectionPerformanceDataKind
from models import HostCPUMemory, HostTraffic, HostDiskUsageIO


__author__ = 'James Iter'
__date__ = '2017/4/15'
__contact__ = 'james.iter.cn@gmail.com'
__copyright__ = '(c) 2017 by James Iter.'


class EventProcessor(object):
    message = None
    log = Log()
    guest = Guest()
    guest_migrate_info = GuestMigrateInfo()
    disk = Disk()
    config = Config()
    cpu_memory = CPUMemory()
    traffic = Traffic()
    disk_io = DiskIO()
    host_cpu_memory = HostCPUMemory()
    host_traffic = HostTraffic()
    host_disk_usage_io = HostDiskUsageIO()

    @classmethod
    def log_processor(cls):
        cls.log.set(type=cls.message['type'], timestamp=cls.message['timestamp'], host=cls.message['host'],
                    message=cls.message['message'],
                    full_message='' if cls.message['message'].__len__() < 255 else cls.message['message'])

        cls.log.create()

    @classmethod
    def guest_event_processor(cls):
        cls.guest.uuid = cls.message['message']['uuid']
        cls.guest.get_by('uuid')
        cls.guest.on_host = cls.message['host']
        last_status = cls.guest.status
        cls.guest.status = cls.message['type']

        if cls.message['type'] == GuestState.update.value:
            # 更新事件不改变 Guest 的状态
            cls.guest.status = last_status
            cls.guest.xml = cls.message['message']['xml']

        elif cls.guest.status == GuestState.migrating.value:
            try:
                cls.guest_migrate_info.uuid = cls.guest.uuid
                cls.guest_migrate_info.get_by('uuid')

                cls.guest_migrate_info.type = cls.message['message']['migrating_info']['type']
                cls.guest_migrate_info.time_elapsed = cls.message['message']['migrating_info']['time_elapsed']
                cls.guest_migrate_info.time_remaining = cls.message['message']['migrating_info']['time_remaining']
                cls.guest_migrate_info.data_total = cls.message['message']['migrating_info']['data_total']
                cls.guest_migrate_info.data_processed = cls.message['message']['migrating_info']['data_processed']
                cls.guest_migrate_info.data_remaining = cls.message['message']['migrating_info']['data_remaining']
                cls.guest_migrate_info.mem_total = cls.message['message']['migrating_info']['mem_total']
                cls.guest_migrate_info.mem_processed = cls.message['message']['migrating_info']['mem_processed']
                cls.guest_migrate_info.mem_remaining = cls.message['message']['migrating_info']['mem_remaining']
                cls.guest_migrate_info.file_total = cls.message['message']['migrating_info']['file_total']
                cls.guest_migrate_info.file_processed = cls.message['message']['migrating_info']['file_processed']
                cls.guest_migrate_info.file_remaining = cls.message['message']['migrating_info']['file_remaining']

                cls.guest_migrate_info.update()

            except ji.PreviewingError as e:
                ret = json.loads(e.message)
                if ret['state']['code'] == '404':
                    cls.guest_migrate_info.type = cls.message['message']['migrating_info']['type']
                    cls.guest_migrate_info.time_elapsed = cls.message['message']['migrating_info']['time_elapsed']
                    cls.guest_migrate_info.time_remaining = cls.message['message']['migrating_info']['time_remaining']
                    cls.guest_migrate_info.data_total = cls.message['message']['migrating_info']['data_total']
                    cls.guest_migrate_info.data_processed = cls.message['message']['migrating_info']['data_processed']
                    cls.guest_migrate_info.data_remaining = cls.message['message']['migrating_info']['data_remaining']
                    cls.guest_migrate_info.mem_total = cls.message['message']['migrating_info']['mem_total']
                    cls.guest_migrate_info.mem_processed = cls.message['message']['migrating_info']['mem_processed']
                    cls.guest_migrate_info.mem_remaining = cls.message['message']['migrating_info']['mem_remaining']
                    cls.guest_migrate_info.file_total = cls.message['message']['migrating_info']['file_total']
                    cls.guest_migrate_info.file_processed = cls.message['message']['migrating_info']['file_processed']
                    cls.guest_migrate_info.file_remaining = cls.message['message']['migrating_info']['file_remaining']

                    cls.guest_migrate_info.create()

        elif cls.guest.status == GuestState.creating.value:
            cls.guest.progress = cls.message['message']['progress']

        cls.guest.update()

        # 限定特殊情况下更新磁盘所属 Guest，避免迁移、创建时频繁被无意义的更新
        if cls.guest.status in [GuestState.running.value, GuestState.shutoff.value]:
            cls.disk.update_by_filter({'on_host': cls.guest.on_host}, filter_str='guest_uuid:eq:' + cls.guest.uuid)

    @classmethod
    def host_event_processor(cls):
        key = cls.message['message']['node_id']
        value = {
            'hostname': cls.message['host'],
            'cpu': cls.message['message']['cpu'],
            'system_load': cls.message['message']['system_load'],
            'memory': cls.message['message']['memory'],
            'memory_available': cls.message['message']['memory_available'],
            'interfaces': cls.message['message']['interfaces'],
            'disks': cls.message['message']['disks'],
            'boot_time': cls.message['message']['boot_time'],
            'timestamp': ji.Common.ts()
        }

        db.r.hset(app.config['hosts_info'], key=key, value=json.dumps(value, ensure_ascii=False))

    @classmethod
    def response_processor(cls):
        _object = cls.message['message']['_object']
        action = cls.message['message']['action']
        uuid = cls.message['message']['uuid']
        state = cls.message['type']
        data = cls.message['message']['data']
        hostname = cls.message['host']

        if _object == 'guest':
            if action == 'create':
                if state == ResponseState.success.value:
                    # 系统盘的 UUID 与其 Guest 的 UUID 相同
                    cls.disk.uuid = uuid
                    cls.disk.get_by('uuid')
                    cls.disk.guest_uuid = uuid
                    cls.disk.state = DiskState.mounted.value
                    # disk_info['virtual-size'] 的单位为Byte，需要除以 1024 的 3 次方，换算成单位为 GB 的值
                    cls.disk.size = data['disk_info']['virtual-size'] / (1024 ** 3)
                    cls.disk.update()

                else:
                    cls.guest.uuid = uuid
                    cls.guest.get_by('uuid')
                    cls.guest.status = GuestState.dirty.value
                    cls.guest.update()

            elif action == 'migrate':
                pass

            elif action == 'delete':
                if state == ResponseState.success.value:
                    cls.config.id = 1
                    cls.config.get()
                    cls.guest.uuid = uuid
                    cls.guest.get_by('uuid')

                    if IP(cls.config.start_ip).int() <= IP(cls.guest.ip).int() <= IP(cls.config.end_ip).int():
                        if db.r.srem(app.config['ip_used_set'], cls.guest.ip):
                            db.r.sadd(app.config['ip_available_set'], cls.guest.ip)

                    if (cls.guest.vnc_port - cls.config.start_vnc_port) <= \
                            (IP(cls.config.end_ip).int() - IP(cls.config.start_ip).int()):
                        if db.r.srem(app.config['vnc_port_used_set'], cls.guest.vnc_port):
                            db.r.sadd(app.config['vnc_port_available_set'], cls.guest.vnc_port)

                    cls.guest.delete()

                    # TODO: 加入是否删除使用的数据磁盘开关，如果为True，则顺便删除使用的磁盘。否则解除该磁盘被使用的状态。
                    cls.disk.uuid = uuid
                    cls.disk.get_by('uuid')
                    cls.disk.delete()
                    cls.disk.update_by_filter({'guest_uuid': '', 'sequence': -1, 'state': DiskState.idle.value},
                                              filter_str='guest_uuid:eq:' + cls.guest.uuid)

            elif action == 'attach_disk':
                cls.disk.uuid = cls.message['message']['passback_parameters']['disk_uuid']
                cls.disk.get_by('uuid')
                if state == ResponseState.success.value:
                    cls.disk.guest_uuid = uuid
                    cls.disk.sequence = cls.message['message']['passback_parameters']['sequence']
                    cls.disk.state = DiskState.mounted.value
                    cls.disk.update()

            elif action == 'detach_disk':
                cls.disk.uuid = cls.message['message']['passback_parameters']['disk_uuid']
                cls.disk.get_by('uuid')
                if state == ResponseState.success.value:
                    cls.disk.guest_uuid = ''
                    cls.disk.sequence = -1
                    cls.disk.state = DiskState.idle.value
                    cls.disk.update()

            elif action == 'boot':
                boot_jobs_id = cls.message['message']['passback_parameters']['boot_jobs_id']

                if state == ResponseState.success.value:
                    cls.guest.uuid = uuid
                    cls.guest.delete_boot_jobs(boot_jobs_id=boot_jobs_id)

        elif _object == 'disk':
            if action == 'create':
                cls.disk.uuid = uuid
                cls.disk.get_by('uuid')
                cls.disk.on_host = hostname
                if state == ResponseState.success.value:
                    cls.disk.state = DiskState.idle.value

                else:
                    cls.disk.state = DiskState.dirty.value

                cls.disk.update()

            elif action == 'resize':
                if state == ResponseState.success.value:
                    cls.disk.uuid = uuid
                    cls.disk.get_by('uuid')
                    cls.disk.size = cls.message['message']['passback_parameters']['size']
                    cls.disk.update()

            elif action == 'delete':
                cls.disk.uuid = uuid
                cls.disk.get_by('uuid')
                cls.disk.delete()

        else:
            pass

    @classmethod
    def collection_performance_processor(cls):
        data_kind = cls.message['type']
        timestamp = ji.Common.ts()
        timestamp -= (timestamp % 60)
        data = cls.message['message']['data']

        if data_kind == CollectionPerformanceDataKind.cpu_memory.value:
            for item in data:
                cls.cpu_memory.guest_uuid = item['guest_uuid']
                cls.cpu_memory.cpu_load = item['cpu_load']
                cls.cpu_memory.memory_available = item['memory_available']
                cls.cpu_memory.memory_unused = item['memory_unused']
                cls.cpu_memory.timestamp = timestamp
                cls.cpu_memory.create()

        if data_kind == CollectionPerformanceDataKind.traffic.value:
            for item in data:
                cls.traffic.guest_uuid = item['guest_uuid']
                cls.traffic.name = item['name']
                cls.traffic.rx_bytes = item['rx_bytes']
                cls.traffic.rx_packets = item['rx_packets']
                cls.traffic.rx_errs = item['rx_errs']
                cls.traffic.rx_drop = item['rx_drop']
                cls.traffic.tx_bytes = item['tx_bytes']
                cls.traffic.tx_packets = item['tx_packets']
                cls.traffic.tx_errs = item['tx_errs']
                cls.traffic.tx_drop = item['tx_drop']
                cls.traffic.timestamp = timestamp
                cls.traffic.create()

        if data_kind == CollectionPerformanceDataKind.disk_io.value:
            for item in data:
                cls.disk_io.disk_uuid = item['disk_uuid']
                cls.disk_io.rd_req = item['rd_req']
                cls.disk_io.rd_bytes = item['rd_bytes']
                cls.disk_io.wr_req = item['wr_req']
                cls.disk_io.wr_bytes = item['wr_bytes']
                cls.disk_io.timestamp = timestamp
                cls.disk_io.create()

        else:
            pass

    @classmethod
    def host_collection_performance_processor(cls):
        data_kind = cls.message['type']
        timestamp = ji.Common.ts()
        timestamp -= (timestamp % 60)
        data = cls.message['message']['data']

        if data_kind == HostCollectionPerformanceDataKind.cpu_memory.value:
            cls.host_cpu_memory.node_id = data['node_id']
            cls.host_cpu_memory.cpu_load = data['cpu_load']
            cls.host_cpu_memory.memory_available = data['memory_available']
            cls.host_cpu_memory.timestamp = timestamp
            cls.host_cpu_memory.create()

        if data_kind == HostCollectionPerformanceDataKind.traffic.value:
            for item in data:
                cls.host_traffic.node_id = item['node_id']
                cls.host_traffic.name = item['name']
                cls.host_traffic.rx_bytes = item['rx_bytes']
                cls.host_traffic.rx_packets = item['rx_packets']
                cls.host_traffic.rx_errs = item['rx_errs']
                cls.host_traffic.rx_drop = item['rx_drop']
                cls.host_traffic.tx_bytes = item['tx_bytes']
                cls.host_traffic.tx_packets = item['tx_packets']
                cls.host_traffic.tx_errs = item['tx_errs']
                cls.host_traffic.tx_drop = item['tx_drop']
                cls.host_traffic.timestamp = timestamp
                cls.host_traffic.create()

        if data_kind == HostCollectionPerformanceDataKind.disk_usage_io.value:
            for item in data:
                cls.host_disk_usage_io.node_id = item['node_id']
                cls.host_disk_usage_io.mountpoint = item['mountpoint']
                cls.host_disk_usage_io.used = item['used']
                cls.host_disk_usage_io.rd_req = item['rd_req']
                cls.host_disk_usage_io.rd_bytes = item['rd_bytes']
                cls.host_disk_usage_io.wr_req = item['wr_req']
                cls.host_disk_usage_io.wr_bytes = item['wr_bytes']
                cls.host_disk_usage_io.timestamp = timestamp
                cls.host_disk_usage_io.create()

        else:
            pass

    @classmethod
    def launch(cls):
        while True:
            if Utils.exit_flag:
                print 'Thread EventProcessor say bye-bye'
                return

            try:
                report = db.r.lpop(app.config['upstream_queue'])

                if report is None:
                    time.sleep(1)
                    continue

                cls.message = json.loads(report)

                if cls.message['kind'] == EmitKind.log.value:
                    cls.log_processor()

                elif cls.message['kind'] == EmitKind.guest_event.value:
                    cls.guest_event_processor()

                elif cls.message['kind'] == EmitKind.host_event.value:
                    cls.host_event_processor()

                elif cls.message['kind'] == EmitKind.response.value:
                    cls.response_processor()

                elif cls.message['kind'] == EmitKind.collection_performance.value:
                    cls.collection_performance_processor()

                elif cls.message['kind'] == EmitKind.host_collection_performance.value:
                    cls.host_collection_performance_processor()

                else:
                    pass

            except Exception as e:
                logger.error(e.message)

