# -*- coding: utf-8 -*-
# Copyright 2017 Vector Creations Ltd
#
# 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.
"""A replication client for use by synapse workers.
"""

import logging

from twisted.internet.protocol import ReconnectingClientFactory

from synapse.replication.tcp.protocol import ClientReplicationStreamProtocol

logger = logging.getLogger(__name__)


class ReplicationClientFactory(ReconnectingClientFactory):
    """Factory for building connections to the master. Will reconnect if the
    connection is lost.

    Accepts a handler that will be called when new data is available or data
    is required.
    """

    initialDelay = 0.1
    maxDelay = 1  # Try at least once every N seconds

    def __init__(self, hs, client_name):
        self.client_name = client_name
        self.handler = hs.get_tcp_replication()
        self.server_name = hs.config.server_name
        self.hs = hs
        self._clock = hs.get_clock()  # As self.clock is defined in super class

        hs.get_reactor().addSystemEventTrigger("before", "shutdown", self.stopTrying)

    def startedConnecting(self, connector):
        logger.info("Connecting to replication: %r", connector.getDestination())

    def buildProtocol(self, addr):
        logger.info("Connected to replication: %r", addr)
        return ClientReplicationStreamProtocol(
            self.hs, self.client_name, self.server_name, self._clock, self.handler,
        )

    def clientConnectionLost(self, connector, reason):
        logger.error("Lost replication conn: %r", reason)
        ReconnectingClientFactory.clientConnectionLost(self, connector, reason)

    def clientConnectionFailed(self, connector, reason):
        logger.error("Failed to connect to replication: %r", reason)
        ReconnectingClientFactory.clientConnectionFailed(self, connector, reason)