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122 lines
4.2 KiB
122 lines
4.2 KiB
from django.conf import settings
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from django.core.cache import cache
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from django.utils.translation import ugettext_lazy as _
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from assets.const import Category
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from assets.models import Asset
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from common.decorator import Singleton
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from common.exceptions import JMSException
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from common.utils import get_logger, get_object_or_none
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from orgs.utils import tmp_to_root_org
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logger = get_logger(__file__)
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@Singleton
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class DBPortManager(object):
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""" 管理端口-数据库ID的映射, Magnus 要使用 """
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CACHE_KEY = 'PORT_DB_MAPPER'
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def __init__(self):
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try:
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port_start, port_end = settings.MAGNUS_PORTS.split('-')
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port_start, port_end = int(port_start), int(port_end)
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except Exception as e:
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logger.error('MAGNUS_PORTS config error: {}'.format(e))
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port_start, port_end = 30000, 30100
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self.port_start, self.port_end = port_start, port_end
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# 可以使用的端口列表
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self.all_available_ports = list(range(self.port_start, self.port_end + 1))
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@property
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def magnus_listen_port_range(self):
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return settings.MAGNUS_PORTS
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def init(self):
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with tmp_to_root_org():
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db_ids = Asset.objects.filter(platform__category=Category.DATABASE).values_list('id', flat=True)
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db_ids = [str(i) for i in db_ids]
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mapper = dict(zip(self.all_available_ports, list(db_ids)))
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self.set_mapper(mapper)
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def add(self, db: Asset):
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mapper = self.get_mapper()
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available_port = self.get_next_available_port()
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mapper.update({available_port: str(db.id)})
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self.set_mapper(mapper)
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return True
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def pop(self, db: Asset):
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mapper = self.get_mapper()
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to_delete_port = self.get_port_by_db(db, raise_exception=False)
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mapper.pop(to_delete_port, None)
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self.set_mapper(mapper)
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def get_port_by_db(self, db, raise_exception=True):
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mapper = self.get_mapper()
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for port, db_id in mapper.items():
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if db_id == str(db.id):
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return port
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if raise_exception:
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error = _(
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'No available port is matched. '
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'The number of databases may have exceeded the number of ports '
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'open to the database agent service, '
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'Contact the administrator to open more ports.'
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)
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raise JMSException(error)
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def get_db_by_port(self, port):
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try:
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port = int(port)
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except Exception as e:
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raise JMSException('Port type error: {}'.format(e))
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mapper = self.get_mapper()
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db_id = mapper.get(port, None)
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if not db_id:
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raise JMSException('Database not in port-db mapper, port: {}'.format(port))
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with tmp_to_root_org():
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db = get_object_or_none(Asset, id=db_id)
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if not db:
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raise JMSException('Database not exists, db id: {}'.format(db_id))
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return db
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def get_next_available_port(self):
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already_use_ports = self.get_already_use_ports()
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available_ports = sorted(list(set(self.all_available_ports) - set(already_use_ports)))
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if len(available_ports) <= 0:
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msg = _('No ports can be used, check and modify the limit on the number '
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'of ports that Magnus listens on in the configuration file.')
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tips = _('All available port count: {}, Already use port count: {}').format(
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len(self.all_available_ports), len(already_use_ports)
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)
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error = msg + tips
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raise JMSException(error)
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port = available_ports[0]
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logger.debug('Get next available port: {}'.format(port))
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return port
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def get_already_use_ports(self):
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mapper = self.get_mapper()
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return sorted(list(mapper.keys()))
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def get_mapper(self):
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mapper = cache.get(self.CACHE_KEY, {})
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if not mapper:
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# redis 可能被清空，重新初始化一下
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self.init()
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return cache.get(self.CACHE_KEY, {})
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def set_mapper(self, value):
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"""
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value: {
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port: db_id
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}
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"""
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cache.set(self.CACHE_KEY, value, timeout=None)
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db_port_manager = DBPortManager()
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