111 lines
3.4 KiB
Python
111 lines
3.4 KiB
Python
# Copyright 2021 Alibaba Group Holding Limited.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import time
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from typing import Callable
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import pymysql
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from . import Context, consensus, channel, convention, engine
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from .consensus import AbstractConsensusManager
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class Manager(object):
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def __init__(self, context: Context):
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self._context = context
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self._engine = engine.new_engine(context.engine_name(), context)
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def context(self) -> Context:
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return self._context
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def engine(self) -> engine.Engine:
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"""
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Return name.
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:return: name.
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"""
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return self._engine
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@staticmethod
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def _print_and_flush(*args, **kwargs):
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print(*args, **kwargs, flush=True)
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@staticmethod
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def _block_until(is_blocked: Callable[[], bool], interval=1):
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while True:
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if is_blocked():
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time.sleep(interval)
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else:
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return
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def wait_for_unblock(self):
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def is_blocked():
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try:
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shared = self.context().shared_channel()
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return shared.is_blocked()
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except:
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return True
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self._block_until(is_blocked)
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def handle_indicates(self):
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"""
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Handle xstore indicates.
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"""
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indicates = self.context().get_controller_indicates()
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if not indicates:
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return
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for ind in indicates:
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if ind == 'block':
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continue
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self.engine().handle_indicate(ind)
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self._block_until(self.context().is_bootstrap_blocked)
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def new_connection(self, *, sock_file: None or str = None, use_local_ip: bool = False) -> pymysql.Connection:
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"""
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Create a new connection.
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:param sock_file: use socket file if provided.
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:param use_local_ip: use local ip if True.
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:return: a new connection.
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"""
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return self.context().new_connection(sock_file=sock_file, use_local_ip=use_local_ip)
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def consensus_manager(self) -> AbstractConsensusManager:
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"""
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New a consensus manager.
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:return: consensus manager.
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:raises: NotSupportedError if not supported.
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"""
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mgr_class = self.engine().consensus_manager_class()
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if not mgr_class:
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raise consensus.NotSupportedError()
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port_paxos = self.context().port(convention.PORT_PAXOS)
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if not port_paxos:
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raise consensus.NotSupportedError('paxos port not found')
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current_addr = '%s:%d' % (self.context().pod_info().ip(), port_paxos)
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return mgr_class(self.new_connection(), current_addr)
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def shared_channel(self) -> channel.SharedFileChannel:
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"""
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Get the shared channel for global cluster info. Only used for consensus related modules.
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:return: a shared channel for global cluster info.
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"""
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return self.context().shared_channel()
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