synapse-old/synapse/replication/tcp/__init__.py

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# 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.
"""This module implements the TCP replication protocol used by synapse to
communicate between the master process and its workers (when they're enabled).
2017-03-31 04:19:24 -06:00
Further details can be found in docs/tcp_replication.rst
Structure of the module:
* handler.py - the classes used to handle sending/receiving commands to
replication
* command.py - the definitions of all the valid commands
* protocol.py - the TCP protocol classes
* resource.py - handles streaming stream updates to replications
* streams/ - the definitions of all the valid streams
The general interaction of the classes are:
+---------------------+
| ReplicationStreamer |
+---------------------+
|
v
+---------------------------+ +----------------------+
| ReplicationCommandHandler |---->|ReplicationDataHandler|
+---------------------------+ +----------------------+
| ^
v |
+-------------+
| Protocols |
| (TCP/redis) |
+-------------+
Where the ReplicationDataHandler (or subclasses) handles incoming stream
updates.
"""