python-mysql-replication

Pure Python Implementation of MySQL replication protocol build on top of PyMYSQL. This allow you to receive event like insert, update, delete with their datas and raw SQL queries.

Use cases

MySQL to NoSQL database replication
MySQL to search engine replication
Invalidate cache when something change in database
Audit
Real time analytics

Documentation

A work in progress documentation is available here: https://python-mysql-replication.readthedocs.org/en/latest/

Instruction about building documentation is available here: https://python-mysql-replication.readthedocs.org/en/latest/developement.html

Installation

pip install mysql-replication

Mailing List

You can get support and discuss about new features on: https://groups.google.com/d/forum/python-mysql-replication

Project status

The project is test with:

MySQL 5.5, 5.6 and 5.7
Python 3.3, 3.4, 3.5 and 3.6 (3.2 is not supported)
PyPy (really faster than the standard Python interpreter)

The project is used in production for critical stuff in some medium internet corporations. But all use case as not been perfectly test in the real world.

Limitations

https://python-mysql-replication.readthedocs.org/en/latest/limitations.html

Projects using this library

pg_chameleon: Migration and replica from MySQL to PostgreSQL https://github.com/the4thdoctor/pg_chameleon
Yelp Data Pipeline: https://engineeringblog.yelp.com/2016/11/open-sourcing-yelps-data-pipeline.html
Singer.io Tap for MySQL (https://github.com/singer-io/tap-mysql)
MySQL River Plugin for ElasticSearch: https://github.com/scharron/elasticsearch-river-mysql
Ditto: MySQL to MemSQL replicator https://github.com/memsql/ditto
ElasticMage: Full Magento integration with ElasticSearch https://github.com/ElasticMage/elasticmage
Cache buster: an automatic cache invalidation system https://github.com/rackerlabs/cache-busters
Zabbix collector for OpenTSDB https://github.com/OpenTSDB/tcollector/blob/master/collectors/0/zabbix_bridge.py
Meepo: Event sourcing and event broadcasting for databases. https://github.com/eleme/meepo
Python MySQL Replication Blinker: This package read events from MySQL binlog and send to blinker's signal. https://github.com/tarzanjw/python-mysql-replication-blinker
aiomysql_replication: Fork supporting asyncio https://github.com/jettify/aiomysql_replication
python-mysql-eventprocessor: Daemon interface for handling MySQL binary log events. https://github.com/jffifa/python-mysql-eventprocessor
mymongo: MySQL to mongo replication https://github.com/njordr/mymongo
pg_ninja: The ninja elephant obfuscation and replica tool https://github.com/transferwise/pg_ninja/ (http://tech.transferwise.com/pg_ninja-replica-with-obfuscation/)
MySQLStreamer: MySQLStreamer is a database change data capture and publish system https://github.com/Yelp/mysql_streamer
binlog2sql: a popular binlog parser that could convert raw binlog to sql and also could generate flashback sql from raw binlog (https://github.com/danfengcao/binlog2sql)
Streaming mysql binlog replication to Snowflake/Redshift/BigQuery (https://github.com/trainingrocket/mysql-binlog-replication)
MySQL to Kafka (https://github.com/scottpersinger/mysql-to-kafka/)
Aventri MySQL Monitor (https://github.com/aventri/mysql-monitor)
BitSwanPump: A real-time stream processor (https://github.com/LibertyAces/BitSwanPump)

MySQL server settings

In your MySQL server configuration file you need to enable replication:

[mysqld]
server-id		 = 1
log_bin			 = /var/log/mysql/mysql-bin.log
expire_logs_days = 10
max_binlog_size  = 100M
binlog-format    = row #Very important if you want to receive write, update and delete row events

Examples

All examples are available in the examples directory

This example will dump all replication events to the console:

from pymysqlreplication import BinLogStreamReader

mysql_settings = {'host': '127.0.0.1', 'port': 3306, 'user': 'root', 'passwd': ''}

stream = BinLogStreamReader(connection_settings = mysql_settings, server_id=100)

for binlogevent in stream:
    binlogevent.dump()

stream.close()

For this SQL sessions:

CREATE DATABASE test;
use test;
CREATE TABLE test4 (id int NOT NULL AUTO_INCREMENT, data VARCHAR(255), data2 VARCHAR(255), PRIMARY KEY(id));
INSERT INTO test4 (data,data2) VALUES ("Hello", "World");
UPDATE test4 SET data = "World", data2="Hello" WHERE id = 1;
DELETE FROM test4 WHERE id = 1;

Output will be:

=== RotateEvent ===
Date: 1970-01-01T01:00:00
Event size: 24
Read bytes: 0

=== FormatDescriptionEvent ===
Date: 2012-10-07T15:03:06
Event size: 84
Read bytes: 0

=== QueryEvent ===
Date: 2012-10-07T15:03:16
Event size: 64
Read bytes: 64
Schema: test
Execution time: 0
Query: CREATE DATABASE test

=== QueryEvent ===
Date: 2012-10-07T15:03:16
Event size: 151
Read bytes: 151
Schema: test
Execution time: 0
Query: CREATE TABLE test4 (id int NOT NULL AUTO_INCREMENT, data VARCHAR(255), data2 VARCHAR(255), PRIMARY KEY(id))

=== QueryEvent ===
Date: 2012-10-07T15:03:16
Event size: 49
Read bytes: 49
Schema: test
Execution time: 0
Query: BEGIN

=== TableMapEvent ===
Date: 2012-10-07T15:03:16
Event size: 31
Read bytes: 30
Table id: 781
Schema: test
Table: test4
Columns: 3

=== WriteRowsEvent ===
Date: 2012-10-07T15:03:16
Event size: 27
Read bytes: 10
Table: test.test4
Affected columns: 3
Changed rows: 1
Values:
--
* data : Hello
* id : 1
* data2 : World

=== XidEvent ===
Date: 2012-10-07T15:03:16
Event size: 8
Read bytes: 8
Transaction ID: 14097

=== QueryEvent ===
Date: 2012-10-07T15:03:17
Event size: 49
Read bytes: 49
Schema: test
Execution time: 0
Query: BEGIN

=== TableMapEvent ===
Date: 2012-10-07T15:03:17
Event size: 31
Read bytes: 30
Table id: 781
Schema: test
Table: test4
Columns: 3

=== UpdateRowsEvent ===
Date: 2012-10-07T15:03:17
Event size: 45
Read bytes: 11
Table: test.test4
Affected columns: 3
Changed rows: 1
Affected columns: 3
Values:
--
* data : Hello => World
* id : 1 => 1
* data2 : World => Hello

=== XidEvent ===
Date: 2012-10-07T15:03:17
Event size: 8
Read bytes: 8
Transaction ID: 14098

=== QueryEvent ===
Date: 2012-10-07T15:03:17
Event size: 49
Read bytes: 49
Schema: test
Execution time: 1
Query: BEGIN

=== TableMapEvent ===
Date: 2012-10-07T15:03:17
Event size: 31
Read bytes: 30
Table id: 781
Schema: test
Table: test4
Columns: 3

=== DeleteRowsEvent ===
Date: 2012-10-07T15:03:17
Event size: 27
Read bytes: 10
Table: test.test4
Affected columns: 3
Changed rows: 1
Values:
--
* data : World
* id : 1
* data2 : Hello

=== XidEvent ===
Date: 2012-10-07T15:03:17
Event size: 8
Read bytes: 8
Transaction ID: 14099

Tests

When it's possible we have a unit test.

More information is available here: https://python-mysql-replication.readthedocs.org/en/latest/developement.html

Changelog

https://github.com/noplay/python-mysql-replication/blob/master/CHANGELOG

Similar projects

Special thanks

MySQL binlog from Jeremy Cole was a great source of knowledge about MySQL replication protocol https://github.com/jeremycole/mysql_binlog
Samuel Charron for his help https://github.com/scharron

Contributors

Major contributor:

Julien Duponchelle Original author https://github.com/noplay
bjoernhaeuser for his bugs fixing, improvements and community support https://github.com/bjoernhaeuser
Arthur Gautier gtid, slave report... https://github.com/baloo

Other contributors:

Dvir Volk for bug fix https://github.com/dvirsky
Lior Sion code cleanup and improvements https://github.com/liorsion
Lx Yu code improvements, primary keys detections https://github.com/lxyu
Young King for pymysql 0.6 support https://github.com/youngking
David Reid checksum checking fix https://github.com/dreid
Alex Gaynor fix smallint24 https://github.com/alex
lifei NotImplementedEvent https://github.com/lifei
Maralla Python 3.4 fix https://github.com/maralla
Daniel Gavrila more MySQL error codes https://github.com/danielduduta
Bernardo Sulzbach code cleanup https://github.com/mafagafogigante
Darioush Jalali Python 2.6 backport https://github.com/darioush
Jasonz bug fixes https://github.com/jasonzzz
Bartek Ogryczak cleanup and improvements https://github.com/vartec
Wang, Xiaozhe cleanup https://github.com/chaoslawful
siddontang improvements https://github.com/siddontang
Cheng Chen Python 2.6 compatibility https://github.com/cccc1999
Jffifa utf8mb4 compatibility https://github.com/jffifa
Romuald Brunet bug fixes https://github.com/romuald
Cédric Hourcade Don't fail on incomplete dates https://github.com/hc
Giacomo Lozito Explicit close stream connection on exception https://github.com/giacomolozito
Giovanni F. MySQL 5.7 support https://github.com/26fe
Igor Mastak intvar event https://github.com/mastak
Xie Zhenye fix missing update _next_seq_no https://github.com/xiezhenye
Abrar Sheikh: Multiple contributions https://github.com/abrarsheikh
Keegan Parker: secondary database for reference schema https://github.com/kdparker
Troy J. Farrell Clear table_map if RotateEvent has timestamp of 0 https://github.com/troyjfarrell
Zhanwei Wang Fail to get table informations https://github.com/wangzw
Alexander Ignatov Fix the JSON literal
Garen Chan Support PyMysql with a version greater than 0.9.3 https://github.com/garenchan
Mike Ascah: Add logic to handle inlined ints in large json documents ttps://github.com/mascah
Hiroaki Kawai: PyMySQL 1.0 support (https://github.com/hkwi)
Dongwook Chan: Support for ZEROFILL, Correct timedelta value for negative MySQL TIME datatype, Fix parsing of row events for MySQL8 partitioned table, Parse status variables in query event, Parse status variables in query event , Fix parse errors with MariaDB (https://github.com/dongwook-chan)
Paul Vickers: Add support for specifying an end log_pos (https://github.com/paulvic)
Samira El Aabidi: Add support for MariaDB GTID (https://github.com/Samira-El)
Oliver Seemann: Handle large json, github actions, Zero-pad fixed-length binary fields (https://github.com/oseemann)
Mahadir Ahmad: Handle null json payload (https://github.com/mahadirz)
Axel Viala: Removal of Python 2.7 (https://github.com/darnuria)
Etern: Add XAPrepareEvent, parse last_committed & sequence_number of GtidEvent (https://github.com/etern)

Thanks to GetResponse for their support

Licence

Copyright 2012-2023 Julien Duponchelle

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.

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