CGM_Public/pretix_cgo
1
0
Fork 0
forked from CGM_Public/pretix_original
Code Pull Requests Actions Activity

Allow to configure a database replica

Browse Source
This commit is contained in:
Raphael Michel
2019-02-14 10:14:12 +01:00
parent 55841ea660
commit 7ed35e06ba
2 changed files with 34 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
doc/admin/config.rst
View File

@@ -125,6 +125,23 @@ Example::
Indicates if the database backend is a MySQL/MariaDB Galera cluster and Indicates if the database backend is a MySQL/MariaDB Galera cluster and
turns on some optimizations/special case handlers. Default: ``False`` turns on some optimizations/special case handlers. Default: ``False``
Database replica settings
-------------------------
If you use a replicated database setup, pretix expects that the default database connection always points to the primary database node.
Routing read queries to a replica on databse layer is **strongly** discouraged since this can lead to inaccurate such as more tickets
being sold than are actually available.
However, pretix can still make use of a database replica to keep some expensive queries with that can tolerate some latency from your
primary database, such as backend search queries. The ``replica`` configuration section can have the same settings as the ``database``
section (except for the ``backend`` setting) and will default back to the ``database`` settings for all values that are not given. This
way, you just need to specify the settings that are different for the replica.
Example::
[replica]
host=192.168.0.2
URLs URLs
---- ----

17
src/pretix/settings.py
View File

@@ -92,6 +92,23 @@ DATABASES = {
} if 'mysql' in db_backend else {} } if 'mysql' in db_backend else {}
} }
} }
DATABASE_REPLICA = 'default'
if config.has_section('replica'):
DATABASE_REPLICA = 'replica'
DATABASES['replica'] = {
'ENGINE': 'django.db.backends.' + db_backend,
'NAME': config.get('replica', 'name', fallback=DATABASES['default']['NAME']),
'USER': config.get('replica', 'user', fallback=DATABASES['default']['USER']),
'PASSWORD': config.get('replica', 'password', fallback=DATABASES['default']['PASSWORD']),
'HOST': config.get('replica', 'host', fallback=DATABASES['default']['HOST']),
'PORT': config.get('replica', 'port', fallback=DATABASES['default']['PORT']),
'CONN_MAX_AGE': 0 if db_backend == 'sqlite3' else 120,
'OPTIONS': db_options,
'TEST': {
'CHARSET': 'utf8mb4',
'COLLATION': 'utf8mb4_unicode_ci',
} if 'mysql' in db_backend else {}
}
STATIC_URL = config.get('urls', 'static', fallback='/static/') STATIC_URL = config.get('urls', 'static', fallback='/static/')