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47 lines
2.0 KiB
Python
47 lines
2.0 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2017 Vector Creations Ltd
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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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"""This module implements the TCP replication protocol used by synapse to
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communicate between the master process and its workers (when they're enabled).
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The protocol is based on fire and forget, line based commands. An example flow
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would be (where '>' indicates master->worker and '<' worker->master flows)::
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> SERVER example.com
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< REPLICATE events 53
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> RDATA events 54 ["$foo1:bar.com", ...]
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> RDATA events 55 ["$foo4:bar.com", ...]
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The example shows the server accepting a new connection and sending its identity
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with the `SERVER` command, followed by the client asking to subscribe to the
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`events` stream from the token `53`. The server then periodically sends `RDATA`
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commands which have the format `RDATA <stream_name> <token> <row>`, where the
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format of `<row>` is defined by the individual streams.
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Error reporting happens by either the client or server sending an `ERROR`
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command, and usually the connection will be closed.
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Structure of the module:
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* client.py - the client classes used for workers to connect to master
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* command.py - the definitions of all the valid commands
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* protocol.py - contains bot the client and server protocol implementations,
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these should not be used directly
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* resource.py - the server classes that accepts and handle client connections
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* streams.py - the definitons of all the valid streams
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Further details can be found in docs/tcp_replication.rst
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"""
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