mirror of
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Merge pull request #8 from carrotquest/docs-and-compatibility
Docs and compatibility
This commit is contained in:
M1ha Shvn
GitHub
commit
c6148d0fb5
19
.travis.yml
19
.travis.yml
|
|
@ -27,28 +27,42 @@ addons:
|
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- postgresql-11
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- postgresql-contrib-11
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- postgresql-client-11
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- postgresql-12
|
||||
- postgresql-contrib-12
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- postgresql-client-12
|
||||
- unzip
|
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- rabbitmq-server
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||||
|
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python:
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- 3.6
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- 3.7
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||||
- 3.8
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|
||||
env:
|
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- PG=9.6 DJANGO=2.1
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- PG=10 DJANGO=2.1
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- PG=11 DJANGO=2.1
|
||||
- PG=12 DJANGO=2.1
|
||||
- PG=9.6 DJANGO=2.2
|
||||
- PG=10 DJANGO=2.2
|
||||
- PG=11 DJANGO=2.2
|
||||
- PG=12 DJANGO=2.2
|
||||
- PG=9.6 DJANGO=3.0
|
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- PG=10 DJANGO=3.0
|
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- PG=11 DJANGO=3.0
|
||||
- PG=12 DJANGO=3.0
|
||||
|
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before_install:
|
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# Use default PostgreSQL 11 port
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- sudo sed -i 's/port = 5433/port = 5432/' /etc/postgresql/11/main/postgresql.conf
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||||
- sudo cp /etc/postgresql/{10,11}/main/pg_hba.conf
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|
||||
- sudo sed -i 's/port = 5434/port = 5432/' /etc/postgresql/12/main/postgresql.conf
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- sudo cp /etc/postgresql/{10,12}/main/pg_hba.conf
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|
||||
# Start PostgreSQL version we need
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- sudo systemctl stop postgresql && sudo systemctl start postgresql@$PG-main
|
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- sudo systemctl stop postgresql
|
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- sudo systemctl start postgresql@$PG-main
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|
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# ClickHouse sources
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- sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv E0C56BD4
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@ -60,9 +74,8 @@ install:
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- sudo apt-get install clickhouse-client clickhouse-server clickhouse-common-static
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- sudo service clickhouse-server restart
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|
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- pip install -r requirements.txt
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- pip install -r requirements-test.txt
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- pip install -q Django==$DJANGO.*
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- pip install redis
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- python setup.py -q install
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|
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before_script:
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|
|
|
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|
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@ -1 +1,2 @@
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# django-clickhouse
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# django-clickhouse
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Documentation is [here](docs/index.md)
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37
docs/basic_information.md
Normal file
37
docs/basic_information.md
Normal file
|
|
@ -0,0 +1,37 @@
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# Basic information
|
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## About
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This project's goal is to build [Yandex ClickHouse](https://clickhouse.yandex/) database into [Django](https://www.djangoproject.com/) project.
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It is based on [infi.clickhouse-orm](https://github.com/Infinidat/infi.clickhouse_orm) library.
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|
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## Features
|
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* Multiple ClickHouse database configuration in [settings.py](https://docs.djangoproject.com/en/2.1/ref/settings/)
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* ORM to create and manage ClickHouse models.
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* ClickHouse migration system.
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* Scalable serialization of django model instances to ORM model instances.
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* Effective periodical synchronization of django models to ClickHouse without loosing data.
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* Synchronization process monitoring.
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|
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## Requirements
|
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* [Python 3](https://www.python.org/downloads/)
|
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* [Django](https://docs.djangoproject.com/) 1.7+
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* [Yandex ClickHouse](https://clickhouse.yandex/)
|
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* [infi.clickhouse-orm](https://github.com/Infinidat/infi.clickhouse_orm)
|
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* [pytz](https://pypi.org/project/pytz/)
|
||||
* [six](https://pypi.org/project/six/)
|
||||
* [typing](https://pypi.org/project/typing/)
|
||||
* [psycopg2](https://www.psycopg.org/)
|
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* [celery](http://www.celeryproject.org/)
|
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* [statsd](https://pypi.org/project/statsd/)
|
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|
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### Optional libraries
|
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* [redis-py](https://redis-py.readthedocs.io/en/latest/) for [RedisStorage](storages.md#redisstorage)
|
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* [django-pg-returning](https://github.com/M1hacka/django-pg-returning)
|
||||
for optimizing registering updates in [PostgreSQL](https://www.postgresql.org/)
|
||||
* [django-pg-bulk-update](https://github.com/M1hacka/django-pg-bulk-update)
|
||||
for performing effective bulk update and create operations in [PostgreSQL](https://www.postgresql.org/)
|
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|
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## Installation
|
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Install via pip:
|
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`pip install django-clickhouse` ([not released yet](https://github.com/carrotquest/django-clickhouse/issues/3))
|
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or via setup.py:
|
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`python setup.py install`
|
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96
docs/configuration.md
Normal file
96
docs/configuration.md
Normal file
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|
@ -0,0 +1,96 @@
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# Configuration
|
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|
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Library configuration is made in settings.py. All parameters start with `CLICKHOUSE_` prefix.
|
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Prefix can be changed using `CLICKHOUSE_SETTINGS_PREFIX` parameter.
|
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|
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### CLICKHOUSE_SETTINGS_PREFIX
|
||||
Defaults to: `'CLICKHOUSE_'`
|
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You can change `CLICKHOUSE_` prefix in settings using this parameter to anything your like.
|
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|
||||
### CLICKHOUSE_DATABASES
|
||||
Defaults to: `{}`
|
||||
A dictionary, defining databases in django-like style.
|
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Key is an alias to communicate with this database in [connections](databases.md#getting-database-objects) and [using](routing.md#settings-database-in-queryset).
|
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Value is a configuration dict with parameters:
|
||||
* [infi.clickhouse_orm database parameters](https://github.com/Infinidat/infi.clickhouse_orm/blob/develop/docs/class_reference.md#database)
|
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* `migrate: bool` - indicates if this database should be migrated. See [migrations](migrations.md).
|
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|
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Example:
|
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```python
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CLICKHOUSE_DATABASES = {
|
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'default': {
|
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'db_name': 'test',
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'username': 'default',
|
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'password': ''
|
||||
},
|
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'reader': {
|
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'db_name': 'read_only',
|
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'username': 'reader',
|
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'readonly': True,
|
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'password': ''
|
||||
}
|
||||
}
|
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```
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|
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### CLICKHOUSE_DEFAULT_DB_ALIAS
|
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Defaults to: `'default'`
|
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A database alias to use in [QuerySets](queries.md) if direct [using](routing.md#settings-database-in-queryset) is not specified.
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|
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### CLICKHOUSE_SYNC_STORAGE
|
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Defaults to: `'django_clickhouse.storages.RedisStorage'`
|
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An [intermediate storage](storages.md) class to use. Can be a string or class.
|
||||
|
||||
### CLICKHOUSE_REDIS_CONFIG
|
||||
Default to: `None`
|
||||
Redis configuration for [RedisStorage](storages.md#redisstorage).
|
||||
If given, should be a dictionary of parameters to pass to [redis-py](https://redis-py.readthedocs.io/en/latest/#redis.Redis).
|
||||
|
||||
Example:
|
||||
```python
|
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CLICKHOUSE_REDIS_CONFIG = {
|
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'host': '127.0.0.1',
|
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'port': 6379,
|
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'db': 8,
|
||||
'socket_timeout': 10
|
||||
}
|
||||
```
|
||||
|
||||
### CLICKHOUSE_SYNC_BATCH_SIZE
|
||||
Defaults to: `10000`
|
||||
Maximum number of operations, fetched by sync process from [intermediate storage](storages.md) per [sync](sync.md)) round.
|
||||
|
||||
### CLICKHOUSE_SYNC_DELAY
|
||||
Defaults to: `5`
|
||||
A delay in seconds between two [sync](synchronization.md) rounds start.
|
||||
|
||||
### CLICKHOUSE_MODELS_MODULE
|
||||
Defaults to: `'clickhouse_models'`
|
||||
Module name inside [django app](https://docs.djangoproject.com/en/3.0/intro/tutorial01/),
|
||||
where [ClickHouseModel](models.md#clickhousemodel) classes are search during migrations.
|
||||
|
||||
### CLICKHOUSE_DATABASE_ROUTER
|
||||
Defaults to: `'django_clickhouse.routers.DefaultRouter'`
|
||||
A dotted path to class, representing [database router](routing.md#router).
|
||||
|
||||
### CLICKHOUSE_MIGRATIONS_PACKAGE
|
||||
Defaults to: `'clickhouse_migrations'`
|
||||
A python package name inside [django app](https://docs.djangoproject.com/en/3.0/intro/tutorial01/),
|
||||
where migration files are searched.
|
||||
|
||||
### CLICKHOUSE_MIGRATION_HISTORY_MODEL
|
||||
Defaults to: `'django_clickhouse.migrations.MigrationHistory'`
|
||||
A dotted name of a ClickHouseModel subclass (including module path),
|
||||
representing [MigrationHistory model](migrations.md#migrationhistory-clickhousemodel).
|
||||
|
||||
### CLICKHOUSE_MIGRATE_WITH_DEFAULT_DB
|
||||
Defaults to: `True`
|
||||
A boolean flag enabling automatic ClickHouse migration,
|
||||
when you call [`migrate`](https://docs.djangoproject.com/en/2.2/ref/django-admin/#django-admin-migrate) on `default` database.
|
||||
|
||||
### CLICKHOUSE_STATSD_PREFIX
|
||||
Defaults to: `clickhouse`
|
||||
A prefix in [statsd](https://pythonhosted.org/python-statsd/) added to each library metric. See [monitoring](monitoring.md).
|
||||
|
||||
### CLICKHOUSE_CELERY_QUEUE
|
||||
Defaults to: `'celery'`
|
||||
A name of a queue, used by celery to plan library sync tasks.
|
||||
37
docs/databases.md
Normal file
37
docs/databases.md
Normal file
|
|
@ -0,0 +1,37 @@
|
|||
# Databases
|
||||
Direct usage of `Database` objects is not expected in this library. But in some cases, you may still need them.
|
||||
This section describes `Database` objects and there usage.
|
||||
|
||||
`django_clickhouse.database.Database` is a class, describing a ClickHouse database connection.
|
||||
|
||||
## Getting database objects
|
||||
To get a `Database` object by its alias name in [CLICKHOUSE_DATABASES](configuration.md#clickhouse_databases)
|
||||
use `django_clickhouse.database.connections` object.
|
||||
This object is a `django_clickhouse.database.ConnectionProxy` instance:
|
||||
it creates `Database` objects when they are used for the first time and stores them in memory.
|
||||
|
||||
Example:
|
||||
```python
|
||||
from django_clickhouse.database import connections
|
||||
|
||||
# Database objects are inited on first call
|
||||
db = connections['default']
|
||||
secondary = connections['secondary']
|
||||
|
||||
# Already inited - object is returned from memory
|
||||
db_link = connections['default']
|
||||
```
|
||||
|
||||
You can also get database objects from [QuerySet](queries.md) and [ClickHouseModel](models.md) instances by calling `get_database(for_write: bool = False)` method.
|
||||
This database may differ, depending on [routing](routing.md#router) you use.
|
||||
|
||||
## Database object
|
||||
Database class is based on [infi.clickhouse_orm Database object](https://github.com/Infinidat/infi.clickhouse_orm/blob/develop/docs/models_and_databases.md#models-and-databases),
|
||||
but extends it with some extra attributes and methods:
|
||||
|
||||
### Database migrations are restricted
|
||||
I expect this library [migration system](migrations.md) to be used.
|
||||
Direct database migration will lead to migration information errors.
|
||||
|
||||
### `insert_tuples` and `select_tuples` methods
|
||||
Methods to work with [ClickHouseModel namedtuples](models.md#clickhousemodel-namedtuple-form).
|
||||
22
docs/index.md
Normal file
22
docs/index.md
Normal file
|
|
@ -0,0 +1,22 @@
|
|||
# Table of contents
|
||||
|
||||
* [Basic information](basic_information.md)
|
||||
* [About](basic_information.md#about)
|
||||
* [Features](basic_information.md#features)
|
||||
* [Requirements](basic_information.md#requirements)
|
||||
* [Installation](basic_information.md#installation)
|
||||
* [Design motivation](motivation.md)
|
||||
* [Usage](overview.md)
|
||||
* [Overview](overview.md)
|
||||
* [Models](models.md)
|
||||
* [DjangoModel](models.md#DjangoModel)
|
||||
* [ClickHouseModel](models.md#ClickHouseModel)
|
||||
* [Making queries](queries.md)
|
||||
* [Databases](models.md)
|
||||
* [Routing](routing.md)
|
||||
* [Migrations](migrations.md)
|
||||
* [Synchronization](synchronization.md)
|
||||
* [Storages](storages.md)
|
||||
* [RedisStorage](storages.md#redisstorage)
|
||||
* [Monitoring](monitoring.md)
|
||||
* [Performance notes](performance.md)
|
||||
77
docs/migrations.md
Normal file
77
docs/migrations.md
Normal file
|
|
@ -0,0 +1,77 @@
|
|||
# Migrations
|
||||
Migration system allows to make migrate ClickHouse table schema based on `ClickHouseModel`.
|
||||
Library migrations are based on [infi.clickhouse_orm migration system](https://github.com/Infinidat/infi.clickhouse_orm/blob/develop/docs/schema_migrations.md),
|
||||
but makes it a little bit more django-like.
|
||||
|
||||
## File structure
|
||||
Each django app can have optional `clickhouse_migrations` package.
|
||||
This is a default package name, it can be changed with [CLICKHOUSE_MIGRATIONS_PACKAGE](configuration.md#clickhouse_migrations_package) setting.
|
||||
|
||||
Package contains py files, starting with 4-digit number.
|
||||
A number gives an order in which migrations will be applied.
|
||||
|
||||
Example:
|
||||
```
|
||||
my_app
|
||||
>> clickhouse_migrations
|
||||
>>>> __init__.py
|
||||
>>>> 0001_initial.py
|
||||
>>>> 0002_add_new_field_to_my_model.py
|
||||
>> clickhouse_models.py
|
||||
>> urls.py
|
||||
>> views.py
|
||||
```
|
||||
|
||||
## Migration files
|
||||
Each file must contain a `Migration` class, inherited from `django_clickhouse.migrations.Migration`.
|
||||
The class should define an `operations` attribute - a list of operations to apply one by one.
|
||||
Operation is one of [operations, supported by infi.clickhouse-orm](https://github.com/Infinidat/infi.clickhouse_orm/blob/develop/docs/schema_migrations.md).
|
||||
|
||||
```python
|
||||
from django_clickhouse import migrations
|
||||
from my_app.clickhouse_models import ClickHouseUser
|
||||
|
||||
class Migration(migrations.Migration):
|
||||
operations = [
|
||||
migrations.CreateTable(ClickHouseUser)
|
||||
]
|
||||
```
|
||||
|
||||
## MigrationHistory ClickHouseModel
|
||||
This model stores information about applied migrations.
|
||||
By default, library uses `django_clickhouse.migrations.MigrationHistory` model,
|
||||
but this can be changed using `CLICKHOUSE_MIGRATION_HISTORY_MODEL` setting.
|
||||
For instance, if you want to make it replicated, you have to redeclare tables engine.
|
||||
|
||||
MigrationHistory model is stored in default database.
|
||||
|
||||
|
||||
## Automatic migrations
|
||||
When library is installed, it tries applying migrations every time,
|
||||
you call [django migrate](https://docs.djangoproject.com/en/3.0/ref/django-admin/#django-admin-migrate). If you want to disable this, use [CLICKHOUSE_MIGRATE_WITH_DEFAULT_DB](configuration.md#clickhouse_migrate_with_default_db) setting.
|
||||
|
||||
By default migrations are applied to all [CLICKHOUSE_DATABASES](configuration.md#clickhouse_databases), which have no flags:
|
||||
* `'migrate': False`
|
||||
* `'readonly': True`
|
||||
|
||||
Note: migrations are only applied, with django `default` database.
|
||||
So if you call `python manage.py migrate --database=secondary` they wouldn't be applied.
|
||||
|
||||
## Migration algorithm
|
||||
- Get a list of databases from `CLICKHOUSE_DATABASES` setting. Migrate them one by one.
|
||||
- Find all django apps from `INSTALLED_APPS` setting, which have no `readonly=True` attribute and have `migrate=True` attribute. Migrate them one by one.
|
||||
* Iterate over `INSTAALLED_APPS`, searching for [clickhouse_migrations package](#file-structure)
|
||||
* If package was not found, skip app.
|
||||
* Get a list of migrations applied from [MigrationHistory model](#migrationhistory-clickhousemodel)
|
||||
* Get a list of unapplied migrations
|
||||
* Get [Migration class](#migration-files) from each migration and call it `apply()` method
|
||||
* `apply()` iterates operations, checking if it should be applied with [router](routing.md)
|
||||
* If migration should be applied, it is applied
|
||||
* Mark migration as applied in [MigrationHistory model](#migrationhistory-clickhousemodel)
|
||||
|
||||
## Security notes
|
||||
1) ClickHouse has no transaction system, as django relational databases.
|
||||
As a result, if migration fails, it would be partially applied and there's no correct way to rollback.
|
||||
I recommend to make migrations as small as possible, so it should be easier to determine and correct the result if something goes wrong.
|
||||
2) Unlike django, this library is enable to unapply migrations.
|
||||
This functionality may be implemented in the future.
|
||||
153
docs/models.md
Normal file
153
docs/models.md
Normal file
|
|
@ -0,0 +1,153 @@
|
|||
# Models
|
||||
Model is a pythonic class representing database table in your code.
|
||||
It also defines an interface (methods) to perform operations on this table
|
||||
and describes its configuration inside framework.
|
||||
|
||||
This library operates 2 kinds of models:
|
||||
* DjangoModel, describing tables in source relational database (PostgreSQL, MySQL, etc.)
|
||||
* ClickHouseModel, describing models in [ClickHouse](https://clickhouse.yandex/docs/en) database
|
||||
|
||||
In order to distinguish them, I will refer them as ClickHouseModel and DjangoModel in further documentation.
|
||||
|
||||
## DjangoModel
|
||||
Django provides a [model system](https://docs.djangoproject.com/en/3.0/topics/db/models/)
|
||||
to interact with relational databases.
|
||||
In order to perform [synchronization](synchronization.md) we need to "catch" all [DML operations](https://en.wikipedia.org/wiki/Data_manipulation_language)
|
||||
on source django model and save information about them in [storage](storages.md).
|
||||
To achieve this, library introduces abstract `django_clickhouse.models.ClickHouseSyncModel` class.
|
||||
Each model, inherited from `ClickHouseSyncModel` will automatically save information, needed to sync to storage.
|
||||
Read [synchronization](synchronization.md) section for more info.
|
||||
|
||||
`ClickHouseSyncModel` saves information about:
|
||||
* `Model.objects.create()`, `Model.objects.bulk_create()`
|
||||
* `Model.save()`, `Model.delete()`
|
||||
* `QuerySet.update()`, `QuerySet.delete()`
|
||||
* All queries of [django-pg-returning](https://pypi.org/project/django-pg-returning/) library
|
||||
* All queries of [django-pg-bulk-update](https://pypi.org/project/django-pg-bulk-update/) library
|
||||
|
||||
You can also combine your custom django manager and queryset using mixins from `django_clickhouse.models` package:
|
||||
|
||||
**Important note**: Operations are saved in [transaction.on_commit()](https://docs.djangoproject.com/en/2.2/topics/db/transactions/#django.db.transaction.on_commit).
|
||||
The goal is avoiding syncing operations, not committed to relational database.
|
||||
But this may also provide bad effect: situation, when transaction is committed,
|
||||
but it hasn't been registered, if something went wrong during registration.
|
||||
|
||||
Example:
|
||||
```python
|
||||
from django_clickhouse.models import ClickHouseSyncModel
|
||||
from django.db import models
|
||||
from datetime import date
|
||||
|
||||
class User(ClickHouseSyncModel):
|
||||
first_name = models.CharField(max_length=50)
|
||||
age = models.IntegerField()
|
||||
birthday = models.DateField()
|
||||
|
||||
# All operations will be registered to sync with ClickHouse models:
|
||||
User.objects.create(first_name='Alice', age=16, birthday=date(2003, 6, 1))
|
||||
User(first_name='Bob', age=17, birthday=date(2002, 1, 1)).save()
|
||||
User.objects.update(first_name='Candy')
|
||||
|
||||
# Custom manager
|
||||
|
||||
```
|
||||
|
||||
## ClickHouseModel
|
||||
This kind of model is based on [infi.clickhouse_orm Model](https://github.com/Infinidat/infi.clickhouse_orm/blob/develop/docs/models_and_databases.md#defining-models)
|
||||
and represents table in [ClickHouse database](https://clickhouse.yandex/docs/en).
|
||||
|
||||
You should define `ClickHouseModel` subclass for each table you want to access and sync in ClickHouse.
|
||||
Each model should be inherited from `django_clickhouse.clickhouse_models.ClickHouseModel`.
|
||||
By default, models are searched in `clickhouse_models` module of each django app.
|
||||
You can change modules name, using setting [CLICKHOUSE_MODELS_MODULE](configuration.md#clickhouse_models_module)
|
||||
|
||||
You can read more about creating models and fields [here](https://github.com/Infinidat/infi.clickhouse_orm/blob/develop/docs/models_and_databases.md#defining-models):
|
||||
all capabilities are supported. At the same time, django-clickhouse libraries adds:
|
||||
* [routing attributes and methods](routing.md)
|
||||
* [sync attributes and methods](synchronization.md)
|
||||
|
||||
Example:
|
||||
```python
|
||||
from django_clickhouse.clickhouse_models import ClickHouseModel
|
||||
from django_clickhouse.engines import MergeTree
|
||||
from infi.clickhouse_orm import fields
|
||||
from my_app.models import User
|
||||
|
||||
|
||||
class HeightData(ClickHouseModel):
|
||||
django_model = User
|
||||
|
||||
first_name = fields.StringField()
|
||||
birthday = fields.DateField()
|
||||
height = fields.Float32Field()
|
||||
|
||||
engine = MergeTree('birthday', ('first_name', 'last_name', 'birthday'))
|
||||
|
||||
|
||||
class AgeData(ClickHouseModel):
|
||||
django_model = User
|
||||
|
||||
first_name = fields.StringField()
|
||||
birthday = fields.DateField()
|
||||
age = fields.UInt32Field()
|
||||
|
||||
engine = MergeTree('birthday', ('first_name', 'last_name', 'birthday'))
|
||||
```
|
||||
|
||||
### ClickHouseMultiModel
|
||||
In some cases you may need to sync single DjangoModel to multiple ClickHouse models.
|
||||
This model gives ability to reduce number of relational database operations.
|
||||
You can read more in [sync](synchronization.md) section.
|
||||
|
||||
Example:
|
||||
```python
|
||||
from django_clickhouse.clickhouse_models import ClickHouseMultiModel
|
||||
from my_app.models import User
|
||||
|
||||
class MyMultiModel(ClickHouseMultiModel):
|
||||
django_model = User
|
||||
sub_models = [AgeData, HeightData]
|
||||
```
|
||||
|
||||
## ClickHouseModel namedtuple form
|
||||
[infi.clickhouse_orm](https://github.com/Infinidat/infi.clickhouse_orm) stores data rows in special Model objects.
|
||||
It works well on hundreds of records.
|
||||
But when you sync 100k records in a batch, initializing 100k model instances will be slow.
|
||||
Too optimize this process `ClickHouseModel` class have `get_tuple_class()` method.
|
||||
It generates a [namedtuple](https://docs.python.org/3/library/collections.html#collections.namedtuple) class,
|
||||
with same data fields a model has.
|
||||
Initializing such tuples takes much less time, then initializing Model objects.
|
||||
|
||||
## Engines
|
||||
Engine is a way of storing, indexing, replicating and sorting data ClickHouse ([docs](https://clickhouse.yandex/docs/en/operations/table_engines/)).
|
||||
Engine system is based on [infi.clickhouse_orm engine system](https://github.com/Infinidat/infi.clickhouse_orm/blob/develop/docs/table_engines.md#table-engines).
|
||||
This library extends original engine classes as each engine can have it's own synchronization mechanics.
|
||||
Engines are defined in `django_clickhouse.engines` module.
|
||||
|
||||
Currently supported engines (with all infi functionality, [more info](https://github.com/Infinidat/infi.clickhouse_orm/blob/develop/docs/table_engines.md#data-replication)):
|
||||
* `MergeTree`
|
||||
* `ReplacingMergeTree`
|
||||
* `SummingMergeTree`
|
||||
* `CollapsingMergeTree`
|
||||
|
||||
|
||||
## Serializers
|
||||
Serializer is a class which translates django model instances to [namedtuples, inserted into ClickHouse](#clickhousemodel-namedtuple-form).
|
||||
`django_clickhouse.serializers.Django2ClickHouseModelSerializer` is used by default in all models.
|
||||
All serializers must inherit this class.
|
||||
|
||||
Serializer must implement next interface:
|
||||
```python
|
||||
from django_clickhouse.serializers import Django2ClickHouseModelSerializer
|
||||
from django.db.models import Model as DjangoModel
|
||||
from typing import *
|
||||
|
||||
class CustomSerializer(Django2ClickHouseModelSerializer):
|
||||
def __init__(self, model_cls: Type['ClickHouseModel'], fields: Optional[Iterable[str]] = None,
|
||||
exclude_fields: Optional[Iterable[str]] = None, writable: bool = False,
|
||||
defaults: Optional[dict] = None) -> None:
|
||||
super().__init__(model_cls, fields=fields, exclude_fields=exclude_fields, writable=writable, defaults=defaults)
|
||||
|
||||
def serialize(self, obj: DjangoModel) -> NamedTuple:
|
||||
pass
|
||||
```
|
||||
55
docs/monitoring.md
Normal file
55
docs/monitoring.md
Normal file
|
|
@ -0,0 +1,55 @@
|
|||
# Monitoring
|
||||
In order to monitor [synchronization](synchronization.md) process, [statsd](https://pypi.org/project/statsd/) is used.
|
||||
Data from statsd then can be used by [Prometheus exporter](https://github.com/prometheus/statsd_exporter)
|
||||
or [Graphite](https://graphite.readthedocs.io/en/latest/).
|
||||
|
||||
## Configuration
|
||||
Library expects statsd to be configured as written in [statsd docs for django](https://statsd.readthedocs.io/en/latest/configure.html#in-django).
|
||||
You can set a common prefix for all keys in this library using [CLICKHOUSE_STATSD_PREFIX](configuration.md#clickhouse_statsd_prefix) parameter.
|
||||
|
||||
## Exported metrics
|
||||
## Gauges
|
||||
* `<prefix>.sync.<model_name>.queue`
|
||||
Number of elements in [intermediate storage](storages.md) queue waiting for import.
|
||||
Queue should not be big. It depends on [sync_delay](synchronization.md#configuration) configured and time for syncing single batch.
|
||||
It is a good parameter to watch and alert on.
|
||||
|
||||
## Timers
|
||||
All time is sent in milliseconds.
|
||||
|
||||
* `<prefix>.sync.<model_name>.total`
|
||||
Total time of single batch task execution.
|
||||
|
||||
* `<prefix>.sync.<model_name>.steps.<step_name>`
|
||||
`<step_name>` is one of `pre_sync`, `get_operations`, `get_sync_objects`, `get_insert_batch`, `get_final_versions`,
|
||||
`insert`, `post_sync`. Read [here](synchronization.md) for more details.
|
||||
Time of each sync step. Can be useful to debug reasons of long sync process.
|
||||
|
||||
* `<prefix>.inserted_tuples.<model_name>`
|
||||
Time of inserting batch of data into ClickHouse.
|
||||
It excludes as much python code as it could to distinguish real INSERT time from python data preparation.
|
||||
|
||||
* `<prefix>.sync.<model_name>.register_operations`
|
||||
Time of inserting sync operations into storage.
|
||||
|
||||
## Counters
|
||||
* `<prefix>.sync.<model_name>.register_operations.<op_name>`
|
||||
`<op_name>` is one or `create`, `update`, `delete`.
|
||||
Number of DML operations added by DjangoModel methods calls to sync queue.
|
||||
|
||||
* `<prefix>.sync.<model_name>.operations`
|
||||
Number of operations, fetched from [storage](storages.md) for sync in one batch.
|
||||
|
||||
* `<prefix>.sync.<model_name>.import_objects`
|
||||
Number of objects, fetched from relational storage (based on operations) in order to sync with ClickHouse models.
|
||||
|
||||
* `<prefix>.inserted_tuples.<model_name>`
|
||||
Number of rows inserted to ClickHouse.
|
||||
|
||||
* `<prefix>.sync.<model_name>.lock.timeout`
|
||||
Number of locks in [RedisStorage](storages.md#redisstorage), not acquired and skipped by timeout.
|
||||
This value should be zero. If not, it means your model sync takes longer then sync task call interval.
|
||||
|
||||
* `<prefix>.sync.<model_name>.lock.hard_release`
|
||||
Number of locks in [RedisStorage](storages.md#redisstorage), released hardly (as process which required a lock is dead).
|
||||
This value should be zero. If not, it means your sync tasks are killed hardly during the sync process (by OutOfMemory killer, for instance).
|
||||
35
docs/motivation.md
Normal file
35
docs/motivation.md
Normal file
|
|
@ -0,0 +1,35 @@
|
|||
# Design motivation
|
||||
## Separate from django database setting, QuerySet and migration system
|
||||
ClickHouse SQL and DML language is near to standard, but does not follow it exactly ([docs](https://clickhouse.tech/docs/en/introduction/distinctive_features/#sql-support)).
|
||||
As a result, it can not be easily integrated into django query subsystem as it expects databases to support:
|
||||
1. Transactions.
|
||||
2. INNER/OUTER JOINS by condition.
|
||||
3. Full featured updates and deletes.
|
||||
4. Per database replication (ClickHouse has per table replication)
|
||||
5. Other features, not supported in ClickHouse.
|
||||
|
||||
In order to have more functionality, [infi.clickhouse-orm](https://github.com/Infinidat/infi.clickhouse_orm)
|
||||
is used as base library for databases, querysets and migrations. The most part of it is compatible and can be used without any changes.
|
||||
|
||||
## Sync over intermediate storage
|
||||
This library has several goals which lead to intermediate storage:
|
||||
1. Fail resistant import, does not matter what the fail reason is:
|
||||
ClickHouse fail, network fail, killing import process by system (OOM, for instance).
|
||||
2. ClickHouse does not like single row inserts: [docs](https://clickhouse.tech/docs/en/introduction/performance/#performance-when-inserting-data).
|
||||
So it's worth batching data somewhere before inserting it.
|
||||
ClickHouse provide BufferEngine for this, but it can loose data if ClickHouse fails - and no one will now about it.
|
||||
3. Better scalability. Different intermediate storages may be implemented in the future, based on databases, queue systems or even BufferEngine.
|
||||
|
||||
## Replication and routing
|
||||
In primitive cases people just have single database or cluster with same tables on each replica.
|
||||
But as ClickHouse has per table replication a more complicated structure can be built:
|
||||
1. Model A is stored on servers 1 and 2
|
||||
2. Model B is stored on servers 2, 3 and 5
|
||||
3. Model C is stored on servers 1, 3 and 4
|
||||
|
||||
Moreover, migration operations in ClickHouse can also be auto-replicated (`ALTER TABLE`, for instance) or not (`CREATE TABLE`).
|
||||
|
||||
In order to make replication scheme scalable:
|
||||
1. Each model has it's own read / write / migrate [routing configuration](routing.md#clickhousemodel-routing-attributes).
|
||||
2. You can use [router](routing.md#router) like django does to set basic routing rules for all models or model groups.
|
||||
|
||||
140
docs/overview.md
Normal file
140
docs/overview.md
Normal file
|
|
@ -0,0 +1,140 @@
|
|||
# Usage overview
|
||||
## Requirements
|
||||
At the begging I expect, that you already have:
|
||||
1. [ClickHouse](https://clickhouse.tech/docs/en/) (with [ZooKeeper](https://zookeeper.apache.org/), if you use replication)
|
||||
2. Relational database used with [Django](https://www.djangoproject.com/). For instance, [PostgreSQL](https://www.postgresql.org/)
|
||||
3. [Django database set up](https://docs.djangoproject.com/en/3.0/ref/databases/)
|
||||
4. [Intermediate storage](storages.md) set up. For instance, [Redis](https://redis.io/).
|
||||
|
||||
## Configuration
|
||||
Add required parameters to [Django settings.py](https://docs.djangoproject.com/en/3.0/topics/settings/):
|
||||
1. [CLICKHOUSE_DATABASES](configuration.md#clickhouse_databases)
|
||||
2. [Intermediate storage](storages.md) configuration. For instance, [RedisStorage](storages.md#redisstorage)
|
||||
3. It's recommended to change [CLICKHOUSE_CELERY_QUEUE](configuration.md#clickhouse_celery_queue)
|
||||
4. Add sync task to [celerybeat schedule](http://docs.celeryproject.org/en/v2.3.3/userguide/periodic-tasks.html).
|
||||
Note, that executing planner every 2 seconds doesn't mean sync is executed every 2 seconds.
|
||||
Sync time depends on model sync_delay attribute value and [CLICKHOUSE_SYNC_DELAY](configuration.md#clickhouse_sync_delay) configuration parameter.
|
||||
You can read more in [sync section](synchronization.md).
|
||||
|
||||
You can also change other [configuration parameters](configuration.md) depending on your project.
|
||||
|
||||
#### Example
|
||||
```python
|
||||
# django-clickhouse library setup
|
||||
CLICKHOUSE_DATABASES = {
|
||||
# Connection name to refer in using(...) method
|
||||
'default': {
|
||||
'db_name': 'test',
|
||||
'username': 'default',
|
||||
'password': ''
|
||||
}
|
||||
}
|
||||
CLICKHOUSE_REDIS_CONFIG = {
|
||||
'host': '127.0.0.1',
|
||||
'port': 6379,
|
||||
'db': 8,
|
||||
'socket_timeout': 10
|
||||
}
|
||||
CLICKHOUSE_CELERY_QUEUE = 'clickhouse'
|
||||
|
||||
# If you have no any celerybeat tasks, define a new dictionary
|
||||
# More info: http://docs.celeryproject.org/en/v2.3.3/userguide/periodic-tasks.html
|
||||
from datetime import timedelta
|
||||
CELERYBEAT_SCHEDULE = {
|
||||
'clickhouse_auto_sync': {
|
||||
'task': 'django_clickhouse.tasks.clickhouse_auto_sync',
|
||||
'schedule': timedelta(seconds=2), # Every 2 seconds
|
||||
'options': {'expires': 1, 'queue': CLICKHOUSE_CELERY_QUEUE}
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
## Adopting django model
|
||||
Read [ClickHouseSyncModel](models.md#djangomodel) section.
|
||||
Inherit all [django models](https://docs.djangoproject.com/en/3.0/topics/db/models/)
|
||||
you want to sync with ClickHouse from `django_clickhouse.models.ClickHouseSyncModel` or sync mixins.
|
||||
|
||||
```python
|
||||
from django_clickhouse.models import ClickHouseSyncModel
|
||||
from django.db import models
|
||||
|
||||
class User(ClickHouseSyncModel):
|
||||
first_name = models.CharField(max_length=50)
|
||||
visits = models.IntegerField(default=0)
|
||||
birthday = models.DateField()
|
||||
```
|
||||
|
||||
## Create ClickHouseModel
|
||||
1. Read [ClickHouseModel section](models.md#clickhousemodel)
|
||||
2. Create `clickhouse_models.py` in your django app.
|
||||
3. Add `ClickHouseModel` class there:
|
||||
```python
|
||||
from django_clickhouse.clickhouse_models import ClickHouseModel
|
||||
from django_clickhouse.engines import MergeTree
|
||||
from infi.clickhouse_orm import fields
|
||||
from my_app.models import User
|
||||
|
||||
class ClickHouseUser(ClickHouseModel):
|
||||
django_model = User
|
||||
|
||||
id = fields.UInt32Field()
|
||||
first_name = fields.StringField()
|
||||
birthday = fields.DateField()
|
||||
visits = fields.UInt32Field(default=0)
|
||||
|
||||
engine = MergeTree('birthday', ('birthday',))
|
||||
```
|
||||
|
||||
## Migration to create table in ClickHouse
|
||||
1. Read [migrations](migrations.md) section
|
||||
2. Create `clickhouse_migrations` package in your django app
|
||||
3. Create `0001_initial.py` file inside the created package. Result structure should be:
|
||||
```
|
||||
my_app
|
||||
>> clickhouse_migrations
|
||||
>>>> __init__.py
|
||||
>>>> 0001_initial.py
|
||||
>> clickhouse_models.py
|
||||
>> models.py
|
||||
```
|
||||
|
||||
4. Add content to file `0001_initial.py`:
|
||||
```python
|
||||
from django_clickhouse import migrations
|
||||
from my_app.cilckhouse_models import ClickHouseUser
|
||||
|
||||
class Migration(migrations.Migration):
|
||||
operations = [
|
||||
migrations.CreateTable(ClickHouseUser)
|
||||
]
|
||||
```
|
||||
|
||||
## Run migrations
|
||||
Call [django migrate](https://docs.djangoproject.com/en/3.0/ref/django-admin/#django-admin-migrate)
|
||||
to apply created migration and create table in ClickHouse.
|
||||
|
||||
## Set up and run celery sync process
|
||||
Set up [celery worker](https://docs.celeryproject.org/en/latest/userguide/workers.html#starting-the-worker) for [CLICKHOUSE_CELERY_QUEUE](configuration.md#clickhouse_celery_queue) and [celerybeat](https://docs.celeryproject.org/en/latest/userguide/periodic-tasks.html#starting-the-scheduler).
|
||||
|
||||
## Test sync and write analytics queries
|
||||
1. Read [monitoring section](monitoring.md) in order to set up your monitoring system.
|
||||
2. Read [query section](queries.md) to understand how to query database.
|
||||
2. Create some data in source table with django.
|
||||
3. Check, if it is synced.
|
||||
|
||||
#### Example
|
||||
```python
|
||||
import time
|
||||
from my_app.models import User
|
||||
from my_app.clickhouse_models import ClickHouseUser
|
||||
|
||||
u = User.objects.create(first_name='Alice', birthday=datetime.date(1987, 1, 1), visits=1)
|
||||
|
||||
# Wait for celery task is executed at list once
|
||||
time.sleep(6)
|
||||
|
||||
assert ClickHouseUser.objects.filter(id=u.id).count() == 1, "Sync is not working"
|
||||
```
|
||||
|
||||
## Congratulations
|
||||
Tune your integration to achieve better performance if needed: [docs](performance.md).
|
||||
46
docs/performance.md
Normal file
46
docs/performance.md
Normal file
|
|
@ -0,0 +1,46 @@
|
|||
# Sync performance
|
||||
Every real life system may have its own performance problems.
|
||||
They depend on:
|
||||
* You ClickHouse servers configuration
|
||||
* Number of ClickHouse instances in your cluster
|
||||
* Your data formats
|
||||
* Import speed
|
||||
* Network
|
||||
* etc
|
||||
|
||||
I recommend to use [monitoring](monitoring.md) in order to understand where is the bottle neck and act accordingly.
|
||||
|
||||
This chapter gives a list of known problems which can slow down your import.
|
||||
|
||||
## ClickHouse tuning
|
||||
Read this [doc](https://clickhouse.tech/docs/en/introduction/performance/#performance-when-inserting-data)
|
||||
and tune it both for read and write.
|
||||
|
||||
## ClickHouse cluster
|
||||
As ClickHouse is a [multimaster database](https://clickhouse.tech/docs/en/introduction/distinctive_features/#data-replication-and-data-integrity-support),
|
||||
you can import and read from any node when you have a cluster.
|
||||
In order to read and import to multiple nodes you can use [CHProxy](https://github.com/Vertamedia/chproxy)
|
||||
or add multiple databases to [routing configuration](routing.md#clickhousemodel-routing-attributes).
|
||||
|
||||
## CollapsingMergeTree engine and previous versions
|
||||
In order to reduce number of stored data in [intermediate storage](storages.md),
|
||||
this library doesn't store old versions of data on update or delete.
|
||||
Another point is that getting previous data versions from relational storages is a hard operation.
|
||||
Engines like `CollapsingMergeTree` get old versions from ClickHouse:
|
||||
1. Using `version_col` if it is set in engine's parameters.
|
||||
This is a special field which stores incremental row versions and is filled by the library.
|
||||
It should be of any unsigned integer type (depending on how many row versions you may have).
|
||||
2. Using `FINAL` query modification.
|
||||
This way is much more slow, but doesn't require additional column.
|
||||
|
||||
## Know your data
|
||||
In common case library user uses python types to form ClickHouse data.
|
||||
Library is responsible for converting this data into format ClickHouse expects to receive.
|
||||
This leads to great number of convert operations when you import data in big batches.
|
||||
In order to reduce this time, you can:
|
||||
* Set `MyClickHouseModel.sync_formatted_tuples` to True
|
||||
* Override `MyClickHouseModel.get_insert_batch(, import_objects: Iterable[DjangoModel])` method:
|
||||
It should get `cls.get_tuple_class()` and yield (it is a [generator](https://wiki.python.org/moin/Generators))
|
||||
so it generates tuples of string values, already prepared to insert into ClickHouse.
|
||||
**Important note**: `ClickHouseModel.get_insert_batch(...)` can perform additional functionality depending on model [engine](models.md#engines).
|
||||
Be careful.
|
||||
66
docs/queries.md
Normal file
66
docs/queries.md
Normal file
|
|
@ -0,0 +1,66 @@
|
|||
# Making queries
|
||||
|
||||
QuerySet system used by this library looks very similar to django, but it is implemented separately.
|
||||
You can read reasons for this design [here](motivation.md#separate-from-django-database-setting-queryset-and-migration-system).
|
||||
|
||||
## Usage
|
||||
Library query system extends [infi.clickhouse-orm QuerySet system](https://github.com/Infinidat/infi.clickhouse_orm/blob/develop/docs/querysets.md) and supports all it features.
|
||||
In most cases you have no need to create querysets explicitly - just use `objects` attribute or `objects_in(db)` method of `ClickHouseModel`.
|
||||
At the same time `django-clickhouse` adds some extra features to `QuerySet` and `AggregateQuerySet`.
|
||||
They are available if your model inherits `django_clickhouse.clickhouse_models.ClickHouseModel`.
|
||||
|
||||
## Extra features
|
||||
### Django-like routing system
|
||||
There's no need to set database object explicitly with `objects_in(...)` method, as original QuerySet expects.
|
||||
Database is determined based on library configuration and [router](routing.md#router) used.
|
||||
|
||||
If you want to set database explicitly you can use any of approaches:
|
||||
* [infi approach](https://github.com/Infinidat/infi.clickhouse_orm/blob/develop/docs/querysets.md#querysets)
|
||||
* Django like `QuerySet.using(db_alias)` method
|
||||
|
||||
Example:
|
||||
```python
|
||||
from django_clickhouse.database import connections
|
||||
from my_app.clickhouse_models import ClickHouseUser
|
||||
|
||||
# This query will choose database using current router.
|
||||
# By default django_clickhouse.routers.DefaultRouter is used.
|
||||
# It gets one random database, from ClickHouseUser.read_db_aliases for read queries
|
||||
ClickHouseUser.objects.filter(id__in=[1,2,3]).count()
|
||||
|
||||
# These queries do the same thing, using 'secondary' connection from CLICKHOUSE_DATABASES setting
|
||||
ClickHouseUser.objects_in(connections['secondary']).filter(id__in=[1,2,3]).count()
|
||||
ClickHouseUser.objects.filter(id__in=[1,2,3]).using('secondary').count()
|
||||
|
||||
# You can get database to use with get_database(for_write: bool = False) method
|
||||
# Note that it if you have multiple database in model settings,
|
||||
# DefaultRouter can return any of them each time function is called, function is stateless
|
||||
ClickHouseUser.objects.get_database(for_write=False)
|
||||
```
|
||||
|
||||
### QuerySet create methods
|
||||
This library adds methods to add objects like django does without direct Database object usage.
|
||||
|
||||
Example:
|
||||
```python
|
||||
from datetime import date
|
||||
from my_app.clickhouse_models import ClickHouseUser
|
||||
|
||||
# This queries will choose database using current router.
|
||||
# By default django_clickhouse.routers.DefaultRouter is used.
|
||||
# It gets one random database, from ClickHouseUser.write_db_aliases for write queries
|
||||
# You can set database explicitly with using(...) or objects_in(...) methods
|
||||
instance = ClickHouseUser.objects.create(id=1, first_name='Alice', visits=1, birthday=date(2003, 6, 1))
|
||||
objs = ClickHouseUser.objects.bulk_create([
|
||||
ClickHouseUser(id=2, first_name='Bob', visits=2, birthday=date(2001, 5, 1)),
|
||||
ClickHouseUser(id=3, first_name='Jhon', visits=3, birthday=date(2002, 7, 11))
|
||||
], batch_size=10)
|
||||
```
|
||||
|
||||
### Getting all objects
|
||||
`QuerySet.all()` method returns copy of current QuerySet:
|
||||
```python
|
||||
from my_app.clickhouse_models import ClickHouseUser
|
||||
|
||||
qs = ClickHouseUser.objects.all()
|
||||
```
|
||||
62
docs/routing.md
Normal file
62
docs/routing.md
Normal file
|
|
@ -0,0 +1,62 @@
|
|||
# Database routing
|
||||
One of this libraries goals was to create easy and extendable automatic database routing.
|
||||
|
||||
## Motivation
|
||||
In original [infi.clickhouse-orm](https://github.com/Infinidat/infi.clickhouse_orm)
|
||||
you had to explicitly create [Database](https://github.com/Infinidat/infi.clickhouse_orm/blob/develop/docs/models_and_databases.md#inserting-to-the-database) objects
|
||||
and set database to each query with `objects_in(db)` method.
|
||||
But common projects use a quite little number of database connections.
|
||||
As a result, it's easier to setup routing once and use it as [django](https://docs.djangoproject.com/en/2.2/topics/db/multi-db/) does.
|
||||
Unlike traditional relational databases, [ClickHouse](https://clickhouse.yandex/docs/en/)
|
||||
has per table replication.
|
||||
This means that:
|
||||
1) Each model can have it's own replication scheme
|
||||
2) Some migration queries are replicated automatically, others - not.
|
||||
3) To make system more extendable we need default routing, per model routing and router class for complex cases.
|
||||
|
||||
## Introduction
|
||||
All database connections are defined in [CLICKHOUSE_DATABASES](configuration.md#clickhouse_databases) setting.
|
||||
Each connection has it's alias name to refer with.
|
||||
If no routing is configured, [CLICKHOUSE_DEFAULT_DB_ALIAS](configuration.md#clickhouse_default_db_alias) is used.
|
||||
|
||||
## Router
|
||||
Router is a class, defining 3 methods:
|
||||
* `def db_for_read(self, model: ClickHouseModel, **hints) -> str`
|
||||
Returns `database alias` to use for given `model` for `SELECT` queries.
|
||||
* `def db_for_write(self, model: ClickHouseModel, **hints) -> str`
|
||||
Returns `database alias` to use for given `model` for `INSERT` queries.
|
||||
* `def allow_migrate(self, db_alias: str, app_label: str, operation: Operation, model: Optional[ClickHouseModel] = None, **hints: dict) -> bool`
|
||||
Checks if migration `operation` should be applied in django application `app_label` on database `db_alias`.
|
||||
Optional `model` field can be used to determine migrations on concrete model.
|
||||
|
||||
By default [CLICKHOUSE_DATABASE_ROUTER](configuration.md#clickhouse_database_router) is used.
|
||||
It gets routing information from model fields, described below.
|
||||
|
||||
## ClickHouseModel routing attributes
|
||||
Default database router reads routing settings from model attributes.
|
||||
```python
|
||||
from django_clickhouse.configuration import config
|
||||
from django_clickhouse.clickhouse_models import ClickHouseModel
|
||||
|
||||
class MyModel(ClickHouseModel):
|
||||
# Servers, model is replicated to.
|
||||
# Router takes random database to read or write from.
|
||||
read_db_aliases = (config.DEFAULT_DB_ALIAS,)
|
||||
write_db_aliases = (config.DEFAULT_DB_ALIAS,)
|
||||
|
||||
# Databases to perform replicated migration queries, such as ALTER TABLE.
|
||||
# Migration is applied to random database from the list.
|
||||
migrate_replicated_db_aliases = (config.DEFAULT_DB_ALIAS,)
|
||||
|
||||
# Databases to perform non-replicated migrations (CREATE TABLE, DROP TABLE).
|
||||
# Migration is applied to all databases from the list.
|
||||
migrate_non_replicated_db_aliases = (config.DEFAULT_DB_ALIAS,)
|
||||
```
|
||||
|
||||
## Settings database in QuerySet
|
||||
Database can be set in each [QuerySet](queries.md) explicitly by using one of methods:
|
||||
* With [infi approach](https://github.com/Infinidat/infi.clickhouse_orm/blob/develop/docs/querysets.md#querysets): `MyModel.objects_in(db_object).filter(id__in=[1,2,3]).count()`
|
||||
* With `using()` method: `MyModel.objects.filter(id__in=[1,2,3]).using(db_alias).count()`
|
||||
|
||||
If no explicit database is provided, database connection to use is determined lazily with router's `db_for_read` or `db_for_write`
|
||||
method, depending on query type.
|
||||
70
docs/storages.md
Normal file
70
docs/storages.md
Normal file
|
|
@ -0,0 +1,70 @@
|
|||
# Storages
|
||||
Storage class is a facade, that stores information about operations, which where performed on django models.
|
||||
It has three main purposes:
|
||||
* Storage should be fast to insert single records. It forms a batch of data, which is then inserted to ClickHouse.
|
||||
* Storage guarantees, that no data is lost.
|
||||
Intermediate data in storage is deleted only after importing batch finishes successfully.
|
||||
If it fails in some point - starting new import process should import failed data again.
|
||||
* Keep information about sync process. For instance, last time the model sync has been called.
|
||||
|
||||
In order to determine different models from each other storage uses `import_key`.
|
||||
By default, it is generated by `ClickHouseModel.get_import_key()` method and is equal to class name.
|
||||
|
||||
Each method of abstract `Storage` class takes `kwargs` parameters, which can be used in concrete storage.
|
||||
|
||||
## Storage methods
|
||||
* `register_operations(import_key: str, operation: str, *pks: *Any) -> int`
|
||||
Saves a new operation in source database to storage. This method should be fast.
|
||||
It is called after source database transaction is committed.
|
||||
Method returns number of operations registered.
|
||||
`operation` is one of `insert`, `update` or `delete`
|
||||
`pks` is an iterable of strings, enough to select needed records from source database.
|
||||
|
||||
* `get_last_sync_time(import_key: str) -> Optional[datetime.datetime]`
|
||||
Returns last time, a model sync has been called. If no sync has been done, returns None.
|
||||
|
||||
* `set_last_sync_time(import_key: str, dt: datetime.datetime) -> None`
|
||||
Saves datetime, when a sync process has been called last time.
|
||||
|
||||
* `register_operations_wrapped(self, import_key: str, operation: str, *pks: *Any) -> int`
|
||||
A wrapper for register_operations. It's goal is to write metrics and logs.
|
||||
|
||||
* `pre_sync(import_key: str, **kwargs) -> None`
|
||||
Called before import process starts. It initializes storage for importing new batch.
|
||||
|
||||
* `operations_count(import_key: str, **kwargs) -> int`
|
||||
Counts, how many operations are waiting for import in storage.
|
||||
|
||||
* `get_operations(import_key: str, count: int, **kwargs) -> List[Tuple[str, str]]`
|
||||
Returns a next batch of operations to import. `count` parameter gives a number of operations to return.
|
||||
Operation is a tuple `(operation, primary_key)`, where `operation` is one of insert, update or delete
|
||||
and `primary_key` is a string enough to select record from source database.
|
||||
|
||||
* `post_sync(import_key: str, **kwargs) -> None`
|
||||
Called after import process have finished. It cleans storage after importing a batch.
|
||||
|
||||
* `post_batch_removed(import_key: str, batch_size: int) -> None`
|
||||
This method should be called by `post_sync` method after data is removed from storage.
|
||||
By default, it marks queue size metric.
|
||||
|
||||
* `post_sync_failed(import_key: str, exception: Exception, **kwargs) -> None:`
|
||||
Called if any exception has occurred during import process. It cleans storage after unsuccessful import.
|
||||
Note that if import process is hardly killed (with OOM killer, for instance) this method is not called.
|
||||
|
||||
* `flush() -> None`
|
||||
*Dangerous*. Drops all data, kept by storage. It is used for cleaning up between tests.
|
||||
|
||||
|
||||
## Predefined storages
|
||||
### RedisStorage
|
||||
This storage uses [Redis database](https://redis.io/) as intermediate storage.
|
||||
To communicate with Redis it uses [redis-py](https://redis-py.readthedocs.io/en/latest/) library.
|
||||
It is not required, but should be installed to use RedisStorage.
|
||||
In order to use RedisStorage you must also fill [CLICKHOUSE_REDIS_CONFIG](configuration.md#clickhouse_redis_config) parameter.
|
||||
|
||||
Stored operation contains:
|
||||
* Django database alias where original record can be found.
|
||||
* Record primary key
|
||||
* Operation performed (insert, update, delete)
|
||||
|
||||
This storage does not allow multi-threaded sync.
|
||||
105
docs/synchronization.md
Normal file
105
docs/synchronization.md
Normal file
|
|
@ -0,0 +1,105 @@
|
|||
# Synchronization
|
||||
|
||||
## Design motivation
|
||||
Read [here](motivation.md#sync-over-intermediate-storage).
|
||||
|
||||
|
||||
## Algorithm
|
||||
<!---  --->
|
||||
1. [Celery beat](https://docs.celeryproject.org/en/latest/userguide/periodic-tasks.html) schedules `django_clickhouse.tasks.clickhouse_auto_sync` task every second or near.
|
||||
2. [Celery workers](https://docs.celeryproject.org/en/latest/userguide/workers.html) execute `clickhouse_auto_sync`.
|
||||
It searches for `ClickHouseModel` subclasses which need sync (if `Model.need_sync()` method returns `True`).
|
||||
2. `django_clickhouse.tasks.sync_clickhouse_model` task is scheduled for each `ClickHouseModel` which needs sync.
|
||||
3. `sync_clickhouse_model` saves sync start time in [storage](storages.md) and calls `ClickHouseModel.sync_batch_from_storage()` method.
|
||||
4. `ClickHouseModel.sync_batch_from_storage()`:
|
||||
* Gets [storage](storages.md) model works with using `ClickHouseModel.get_storage()` method
|
||||
* Calls `Storage.pre_sync(import_key)` for model [storage](storages.md).
|
||||
This may be used to prevent parallel execution with locks or some other operations.
|
||||
* Gets a list of operations to sync from [storage](storages.md).
|
||||
* Fetches objects from relational database calling `ClickHouseModel.get_sync_objects(operations)` method.
|
||||
* Forms a batch of tuples to insert into ClickHouse using `ClickHouseModel.get_insert_batch(import_objects)` method.
|
||||
* Inserts batch of tuples into ClickHouse using `ClickHouseModel.insert_batch(batch)` method.
|
||||
* Calls `Storage.post_sync(import_key)` method to clean up storage after syncing batch.
|
||||
This method also removes synced operations from storage.
|
||||
* If some exception occurred during execution, `Storage.post_sybc_failed(import_key)` method is called.
|
||||
Note, that process can be killed without exception, for instance by OOM killer.
|
||||
And this method will not be called.
|
||||
|
||||
|
||||
## Configuration
|
||||
Sync configuration can be set globally using django settings.py parameters or redeclared for each `ClickHouseModel` class.
|
||||
`ClickHouseModel` configuration is prior to settings configuration.
|
||||
|
||||
### Settings configuration
|
||||
* [CLICKHOUSE_CELERY_QUEUE](configuration.md#clickhouse_celery_queue)
|
||||
Defaults to: `'celery'`
|
||||
A name of a queue, used by celery to plan library sync tasks.
|
||||
|
||||
* [CLICKHOUSE_SYNC_STORAGE](configuration.md#clickhouse_sync_storage)
|
||||
Defaults to: `'django_clickhouse.storages.RedisStorage'`
|
||||
An [intermediate storage](storages.md) class to use. Can be a string or class.
|
||||
|
||||
* [CLICKHOUSE_SYNC_BATCH_SIZE](configuration.md#clickhouse_sync_storage)
|
||||
Defaults to: `10000`
|
||||
Maximum number of operations, fetched by sync process from [intermediate storage](storages.md) per sync round.
|
||||
|
||||
* [CLICKHOUSE_SYNC_DELAY](configuration.md#clickhouse_sync_storage)
|
||||
Defaults to: `5`
|
||||
A delay in seconds between two sync rounds start.
|
||||
|
||||
### ClickHouseModel configuration
|
||||
Each `ClickHouseModel` subclass can define sync arguments and methods:
|
||||
* `django_model: django.db.models.Model`
|
||||
Required.
|
||||
Django model this ClickHouseModel class is synchronized with.
|
||||
|
||||
* `django_model_serializer: django.db.models.Model`
|
||||
Defaults to: `django_clickhouse.serializers.Django2ClickHouseModelSerializer`
|
||||
[Serializer class](models.md#serializers) to convert DjangoModel to ClickHouseModel.
|
||||
|
||||
* `sync_enabled: bool`
|
||||
Defaults to: `False`.
|
||||
Is sync for this model enabled?
|
||||
|
||||
* `sync_batch_size: int`
|
||||
Defaults to: [CLICKHOUSE_SYNC_BATCH_SIZE](configuration.md#clickhouse_sync_storage)
|
||||
Maximum number of operations, fetched by sync process from [storage](storages.md) per sync round.
|
||||
|
||||
* `sync_delay: float`
|
||||
Defaults to: [CLICKHOUSE_SYNC_DELAY](configuration.md#clickhouse_sync_storage)
|
||||
A delay in seconds between two sync rounds start.
|
||||
|
||||
* `sync_storage: Union[str, Storage]`
|
||||
Defaults to: [CLICKHOUSE_SYNC_STORAGE](configuration.md#clickhouse_sync_storage)
|
||||
An [intermediate storage](storages.md) class to use. Can be a string or class.
|
||||
|
||||
Example:
|
||||
```python
|
||||
from django_clickhouse.clickhouse_models import ClickHouseModel
|
||||
from django_clickhouse.engines import ReplacingMergeTree
|
||||
from infi.clickhouse_orm import fields
|
||||
from my_app.models import User
|
||||
|
||||
class ClickHouseUser(ClickHouseModel):
|
||||
django_model = User
|
||||
sync_enabled = True
|
||||
sync_delay = 5
|
||||
sync_batch_size = 1000
|
||||
|
||||
id = fields.UInt32Field()
|
||||
first_name = fields.StringField()
|
||||
birthday = fields.DateField()
|
||||
visits = fields.UInt32Field(default=0)
|
||||
|
||||
engine = ReplacingMergeTree('birthday', ('birthday',))
|
||||
```
|
||||
|
||||
|
||||
## Fail resistance
|
||||
Fail resistance is based on several points:
|
||||
1. [Storage](storages.md) should not loose data in any case. It's not this library goal to keep it stable.
|
||||
2. Data is removed from [storage](storages.md) only if import succeeds. Otherwise import attempt is repeated.
|
||||
3. It's recommended to use ReplacingMergeTree or CollapsingMergeTree [engines](models.md#engines)
|
||||
instead of simple MergeTree, so it removes duplicates if batch is imported twice.
|
||||
4. Each `ClickHouseModel` is synced in separate process.
|
||||
If one model fails, it should not affect other models.
|
||||
11
requirements-test.txt
Normal file
11
requirements-test.txt
Normal file
|
|
@ -0,0 +1,11 @@
|
|||
Django (>=1.7)
|
||||
pytz
|
||||
six
|
||||
typing
|
||||
psycopg2
|
||||
infi.clickhouse-orm
|
||||
celery
|
||||
statsd
|
||||
django-pg-returning
|
||||
django-pg-bulk-update
|
||||
redis
|
||||
|
|
@ -5,5 +5,4 @@ typing
|
|||
psycopg2
|
||||
infi.clickhouse-orm
|
||||
celery
|
||||
statsd
|
||||
django-pg-returning
|
||||
statsd
|
||||
2
setup.py
2
setup.py
|
|
@ -13,7 +13,7 @@ with open('requirements.txt') as f:
|
|||
|
||||
setup(
|
||||
name='django-clickhouse',
|
||||
version='0.0.1',
|
||||
version='1.0.0',
|
||||
packages=['django_clickhouse'],
|
||||
package_dir={'': 'src'},
|
||||
url='https://github.com/carrotquest/django-clickhouse',
|
||||
|
|
|
|||
|
|
@ -48,9 +48,17 @@ class ClickHouseModel(with_metaclass(ClickHouseModelMeta, InfiModel)):
|
|||
django_model = None
|
||||
django_model_serializer = Django2ClickHouseModelSerializer
|
||||
|
||||
# Servers, model is replicated to.
|
||||
# Router takes random database to read or write from.
|
||||
read_db_aliases = (config.DEFAULT_DB_ALIAS,)
|
||||
write_db_aliases = (config.DEFAULT_DB_ALIAS,)
|
||||
|
||||
# Databases to perform replicated migration queries, such as ALTER TABLE.
|
||||
# Migration is applied to random database from the list.
|
||||
migrate_replicated_db_aliases = (config.DEFAULT_DB_ALIAS,)
|
||||
|
||||
# Databases to perform non-replicated migrations (CREATE TABLE, DROP TABLE).
|
||||
# Migration is applied to all databases from the list.
|
||||
migrate_non_replicated_db_aliases = (config.DEFAULT_DB_ALIAS,)
|
||||
|
||||
sync_enabled = False
|
||||
|
|
@ -86,12 +94,11 @@ class ClickHouseModel(with_metaclass(ClickHouseModelMeta, InfiModel)):
|
|||
return namedtuple("%sTuple" % cls.__name__, field_names, defaults=default_values)
|
||||
|
||||
@classmethod
|
||||
def objects_in(cls, database): # type: (Database) -> QuerySet
|
||||
def objects_in(cls, database: Database)-> QuerySet:
|
||||
return QuerySet(cls, database)
|
||||
|
||||
@classmethod
|
||||
def get_database_alias(cls, for_write=False):
|
||||
# type: (bool) -> str
|
||||
def get_database_alias(cls, for_write: bool = False) -> str:
|
||||
"""
|
||||
Gets database alias for read or write purposes
|
||||
:param for_write: Boolean flag if database is neede for read or for write
|
||||
|
|
@ -104,8 +111,7 @@ class ClickHouseModel(with_metaclass(ClickHouseModelMeta, InfiModel)):
|
|||
return db_router.db_for_read(cls)
|
||||
|
||||
@classmethod
|
||||
def get_database(cls, for_write=False):
|
||||
# type: (bool) -> Database
|
||||
def get_database(cls, for_write: bool = False) -> Database:
|
||||
"""
|
||||
Gets database alias for read or write purposes
|
||||
:param for_write: Boolean flag if database is neede for read or for write
|
||||
|
|
@ -115,8 +121,8 @@ class ClickHouseModel(with_metaclass(ClickHouseModelMeta, InfiModel)):
|
|||
return connections[db_alias]
|
||||
|
||||
@classmethod
|
||||
def get_django_model_serializer(cls, writable=False, defaults=None):
|
||||
# type: (bool, Optional[dict]) -> Django2ClickHouseModelSerializer
|
||||
def get_django_model_serializer(cls, writable: bool= False, defaults: Optional[dict] = None
|
||||
) -> Django2ClickHouseModelSerializer:
|
||||
serializer_cls = lazy_class_import(cls.django_model_serializer)
|
||||
return serializer_cls(cls, writable=writable, defaults=defaults)
|
||||
|
||||
|
|
@ -163,7 +169,7 @@ class ClickHouseModel(with_metaclass(ClickHouseModelMeta, InfiModel)):
|
|||
return True
|
||||
|
||||
@classmethod
|
||||
def get_sync_query_set(cls, using, pk_set): # type: (str, Set[Any]) -> DjangoQuerySet
|
||||
def get_sync_query_set(cls, using: str, pk_set: Set[Any]) -> DjangoQuerySet:
|
||||
"""
|
||||
Forms django queryset to fetch for sync
|
||||
:param using: Database to fetch from
|
||||
|
|
@ -173,7 +179,7 @@ class ClickHouseModel(with_metaclass(ClickHouseModelMeta, InfiModel)):
|
|||
return cls.django_model.objects.filter(pk__in=pk_set).using(using)
|
||||
|
||||
@classmethod
|
||||
def get_sync_objects(cls, operations): # type: (List[Tuple[str, str]]) -> List[DjangoModel]
|
||||
def get_sync_objects(cls, operations: List[Tuple[str, str]]) -> List[DjangoModel]:
|
||||
"""
|
||||
Returns objects from main database to sync
|
||||
:param operations: A list of operations to perform
|
||||
|
|
@ -195,7 +201,7 @@ class ClickHouseModel(with_metaclass(ClickHouseModelMeta, InfiModel)):
|
|||
return list(chain(*objs))
|
||||
|
||||
@classmethod
|
||||
def get_insert_batch(cls, import_objects): # type: (Iterable[DjangoModel]) -> List[ClickHouseModel]
|
||||
def get_insert_batch(cls, import_objects: Iterable[DjangoModel]) -> List['ClickHouseModel']:
|
||||
"""
|
||||
Formats django model objects to batch of ClickHouse objects
|
||||
:param import_objects: DjangoModel objects to import
|
||||
|
|
@ -259,7 +265,7 @@ class ClickHouseModel(with_metaclass(ClickHouseModelMeta, InfiModel)):
|
|||
raise ex
|
||||
|
||||
@classmethod
|
||||
def need_sync(cls): # type: () -> bool
|
||||
def need_sync(cls) -> bool:
|
||||
"""
|
||||
Checks if this model needs synchronization: sync is enabled and delay has passed
|
||||
:return: Boolean
|
||||
|
|
|
|||
|
|
@ -1,5 +1,9 @@
|
|||
import sys
|
||||
from collections import namedtuple as basenamedtuple
|
||||
from typing import Any, Set
|
||||
|
||||
from django.db import transaction, connections
|
||||
from django.db.models import QuerySet
|
||||
|
||||
|
||||
def namedtuple(*args, **kwargs):
|
||||
|
|
@ -16,3 +20,36 @@ def namedtuple(*args, **kwargs):
|
|||
return TupleClass
|
||||
else:
|
||||
return basenamedtuple(*args, **kwargs)
|
||||
|
||||
|
||||
def django_pg_returning_available(using: str) -> bool:
|
||||
"""
|
||||
Checks if django-pg-returning library is installed and can be used with given databse
|
||||
:return: Boolean
|
||||
"""
|
||||
try:
|
||||
import django_pg_returning
|
||||
return connections[using].vendor == 'postgresql'
|
||||
except ImportError:
|
||||
return False
|
||||
|
||||
|
||||
def update_returning_pk(qs: QuerySet, updates: dict) -> Set[Any]:
|
||||
"""
|
||||
Updates QuerySet items returning primary key values.
|
||||
This method should not depend on database engine, though can have optimization performances for some engines.
|
||||
:param qs: QuerySet to update
|
||||
:param updates: Update items as passed to QuerySet.update(**updates) method
|
||||
:return: A set of primary keys
|
||||
"""
|
||||
qs._for_write = True
|
||||
if django_pg_returning_available(qs.db) and hasattr(qs, 'update_returning'):
|
||||
pk_name = qs.model._meta.pk.name
|
||||
qs = qs.only(pk_name).update_returning(**updates)
|
||||
pks = set(qs.values_list(pk_name, flat=True))
|
||||
else:
|
||||
with transaction.atomic(using=qs.db):
|
||||
pks = set(qs.select_for_update().values_list('pk', flat=True))
|
||||
QuerySet.update(qs, **updates)
|
||||
|
||||
return pks
|
||||
|
|
|
|||
|
|
@ -28,7 +28,7 @@ DEFAULTS = {
|
|||
|
||||
|
||||
class Config:
|
||||
def __getattr__(self, item): # type: (str) -> Any
|
||||
def __getattr__(self, item: str) -> Any:
|
||||
if item not in DEFAULTS:
|
||||
raise AttributeError('Unknown config parameter `%s`' % item)
|
||||
|
||||
|
|
|
|||
|
|
@ -35,8 +35,8 @@ class Database(InfiDatabase):
|
|||
def _get_applied_migrations(self, migrations_package_name):
|
||||
raise NotImplementedError("This method is not supported by django_clickhouse.")
|
||||
|
||||
def select_tuples(self, query, model_class, settings=None):
|
||||
# type: (str, Type['ClickHouseModel'], Optional[dict], Optional[dict]) -> Generator[tuple]
|
||||
def select_tuples(self, query: str, model_class: Type['ClickHouseModel'], settings: Optional[dict] = None
|
||||
) -> Iterable[tuple]:
|
||||
"""
|
||||
This method selects model_class namedtuples, instead of class instances.
|
||||
Less memory consumption, greater speed
|
||||
|
|
@ -67,11 +67,11 @@ class Database(InfiDatabase):
|
|||
|
||||
yield item
|
||||
|
||||
def insert_tuples(self, model_class, model_tuples, batch_size=None, formatted=False):
|
||||
# type: (Type['ClickHouseModel'], Iterable[tuple], Optional[int], bool) -> None
|
||||
def insert_tuples(self, model_class: Type['ClickHouseModel'], model_tuples: Iterable[tuple],
|
||||
batch_size: Optional[int] = None, formatted: bool = False) -> None:
|
||||
"""
|
||||
Inserts model_class namedtuples
|
||||
:param model_class: Clickhouse model, namedtuples are made from
|
||||
:param model_class: ClickHouse model, namedtuples are made from
|
||||
:param model_tuples: An iterable of tuples to insert
|
||||
:param batch_size: Size of batch
|
||||
:param formatted: If flag is set, tuples are expected to be ready to insert without calling field.to_db_string
|
||||
|
|
|
|||
|
|
@ -2,7 +2,7 @@
|
|||
This file contains wrappers for infi.clckhouse_orm engines to use in django-clickhouse
|
||||
"""
|
||||
import datetime
|
||||
from typing import List, Type, Union, Iterable, Generator
|
||||
from typing import List, Type, Union, Iterable, Generator, Optional
|
||||
|
||||
from django.db.models import Model as DjangoModel
|
||||
from infi.clickhouse_orm import engines as infi_engines
|
||||
|
|
@ -14,8 +14,7 @@ from .utils import format_datetime
|
|||
|
||||
|
||||
class InsertOnlyEngineMixin:
|
||||
def get_insert_batch(self, model_cls, objects):
|
||||
# type: (Type['ClickHouseModel'], List[DjangoModel]) -> Generator[tuple]
|
||||
def get_insert_batch(self, model_cls: Type['ClickHouseModel'], objects: List[DjangoModel]) -> Iterable[tuple]:
|
||||
"""
|
||||
Gets a list of model_cls instances to insert into database
|
||||
:param model_cls: ClickHouseModel subclass to import
|
||||
|
|
@ -69,8 +68,8 @@ class CollapsingMergeTree(InsertOnlyEngineMixin, infi_engines.CollapsingMergeTre
|
|||
max_date=max_date, object_pks=','.join(object_pks))
|
||||
return connections[db_alias].select_tuples(query, model_cls)
|
||||
|
||||
def get_final_versions(self, model_cls, objects, date_col=None):
|
||||
# type: (Type['ClickHouseModel'], Iterable[DjangoModel], str) -> Generator[tuple]
|
||||
def get_final_versions(self, model_cls: Type['ClickHouseModel'], objects: Iterable[DjangoModel],
|
||||
date_col: Optional[str] = None) -> Iterable[tuple]:
|
||||
"""
|
||||
Get objects, that are currently stored in ClickHouse.
|
||||
Depending on the partition key this can be different for different models.
|
||||
|
|
@ -82,7 +81,7 @@ class CollapsingMergeTree(InsertOnlyEngineMixin, infi_engines.CollapsingMergeTre
|
|||
:return: A generator of named tuples, representing previous state
|
||||
"""
|
||||
|
||||
def _dt_to_str(dt): # type: (Union[datetime.date, datetime.datetime]) -> str
|
||||
def _dt_to_str(dt: Union[datetime.date, datetime.datetime]) -> str:
|
||||
if isinstance(dt, datetime.datetime):
|
||||
return format_datetime(dt, 0, db_alias=db_alias)
|
||||
elif isinstance(dt, datetime.date):
|
||||
|
|
@ -123,8 +122,7 @@ class CollapsingMergeTree(InsertOnlyEngineMixin, infi_engines.CollapsingMergeTre
|
|||
else:
|
||||
return self._get_final_versions_by_final(*params)
|
||||
|
||||
def get_insert_batch(self, model_cls, objects):
|
||||
# type: (Type['ClickHouseModel'], List[DjangoModel]) -> Generator[tuple]
|
||||
def get_insert_batch(self, model_cls: Type['ClickHouseModel'], objects: List[DjangoModel]) -> Iterable[tuple]:
|
||||
"""
|
||||
Gets a list of model_cls instances to insert into database
|
||||
:param model_cls: ClickHouseModel subclass to import
|
||||
|
|
|
|||
|
|
@ -23,7 +23,7 @@ class Migration:
|
|||
"""
|
||||
operations = []
|
||||
|
||||
def apply(self, db_alias, database=None): # type: (str, Optional[Database]) -> None
|
||||
def apply(self, db_alias: str, database: Optional[Database] = None) -> None:
|
||||
"""
|
||||
Applies migration to given database
|
||||
:param db_alias: Database alias to apply migration to
|
||||
|
|
@ -37,12 +37,11 @@ class Migration:
|
|||
model_class = getattr(op, 'model_class', None)
|
||||
hints = getattr(op, 'hints', {})
|
||||
|
||||
if db_router.allow_migrate(db_alias, self.__module__, op, model=model_class, **hints):
|
||||
if db_router.allow_migrate(db_alias, self.__module__, op, model_class, **hints):
|
||||
op.apply(database)
|
||||
|
||||
|
||||
def migrate_app(app_label, db_alias, up_to=9999, database=None):
|
||||
# type: (str, str, int, Optional[Database]) -> None
|
||||
def migrate_app(app_label: str, db_alias: str, up_to: int = 9999, database: Optional[Database] = None) -> None:
|
||||
"""
|
||||
Migrates given django app
|
||||
:param app_label: App label to migrate
|
||||
|
|
@ -110,7 +109,7 @@ class MigrationHistory(ClickHouseModel):
|
|||
engine = MergeTree('applied', ('db_alias', 'package_name', 'module_name'))
|
||||
|
||||
@classmethod
|
||||
def set_migration_applied(cls, db_alias, migrations_package, name): # type: (str, str, str) -> None
|
||||
def set_migration_applied(cls, db_alias: str, migrations_package: str, name: str) -> None:
|
||||
"""
|
||||
Sets migration apply status
|
||||
:param db_alias: Database alias migration is applied to
|
||||
|
|
@ -126,7 +125,7 @@ class MigrationHistory(ClickHouseModel):
|
|||
applied=datetime.date.today())
|
||||
|
||||
@classmethod
|
||||
def get_applied_migrations(cls, db_alias, migrations_package): # type: (str, str) -> Set[str]
|
||||
def get_applied_migrations(cls, db_alias: str, migrations_package: str) -> Set[str]:
|
||||
"""
|
||||
Returns applied migrations names
|
||||
:param db_alias: Database alias, to check
|
||||
|
|
|
|||
|
|
@ -7,18 +7,17 @@ from typing import Optional, Any, Type, Set
|
|||
|
||||
import six
|
||||
from django.db import transaction
|
||||
from django.db.models import Manager as DjangoManager
|
||||
from django.db.models import QuerySet as DjangoQuerySet, Model as DjangoModel, Manager as DjangoManager
|
||||
from django.db.models.manager import BaseManager
|
||||
from django.db.models.signals import post_save, post_delete
|
||||
from django.dispatch import receiver
|
||||
from django.db.models import QuerySet as DjangoQuerySet, Model as DjangoModel
|
||||
from statsd.defaults.django import statsd
|
||||
|
||||
from .compatibility import update_returning_pk
|
||||
from .configuration import config
|
||||
from .storages import Storage
|
||||
from .utils import lazy_class_import
|
||||
|
||||
|
||||
try:
|
||||
from django_pg_returning.manager import UpdateReturningMixin
|
||||
except ImportError:
|
||||
|
|
@ -34,9 +33,9 @@ except ImportError:
|
|||
|
||||
|
||||
class ClickHouseSyncRegisterMixin:
|
||||
def _register_ops(self, operation, result):
|
||||
def _register_ops(self, operation, result, as_int: bool = False):
|
||||
pk_name = self.model._meta.pk.name
|
||||
pk_list = [getattr(item, pk_name) for item in result]
|
||||
pk_list = [getattr(item, pk_name) if isinstance(item, DjangoModel) else item for item in result]
|
||||
self.model.register_clickhouse_operations(operation, *pk_list, using=self.db)
|
||||
|
||||
|
||||
|
|
@ -72,35 +71,51 @@ class ClickHouseSyncBulkUpdateQuerySetMixin(ClickHouseSyncRegisterMixin, BulkUpd
|
|||
|
||||
return returning
|
||||
|
||||
def bulk_update(self, *args, **kwargs):
|
||||
def _decorate_method(self, name: str, operation: str, args, kwargs):
|
||||
if not hasattr(super(), name):
|
||||
raise AttributeError("QuerySet has no attribute %s. Is django-pg-bulk-update library installed?" % name)
|
||||
|
||||
func = getattr(super(), name)
|
||||
original_returning = kwargs.pop('returning', None)
|
||||
kwargs['returning'] = self._update_returning_param(original_returning)
|
||||
result = super().bulk_update(*args, **kwargs)
|
||||
self._register_ops('update', result)
|
||||
result = func(*args, **kwargs)
|
||||
self._register_ops(operation, result)
|
||||
return result.count() if original_returning is None else result
|
||||
|
||||
def bulk_update_or_create(self, *args, **kwargs):
|
||||
original_returning = kwargs.pop('returning', None)
|
||||
kwargs['returning'] = self._update_returning_param(original_returning)
|
||||
result = super().bulk_update_or_create(*args, **kwargs)
|
||||
self._register_ops('update', result)
|
||||
return result.count() if original_returning is None else result
|
||||
def pg_bulk_update(self, *args, **kwargs):
|
||||
return self._decorate_method('pg_bulk_update', 'update', args, kwargs)
|
||||
|
||||
def pg_bulk_update_or_create(self, *args, **kwargs):
|
||||
return self._decorate_method('pg_bulk_update_or_create', 'update', args, kwargs)
|
||||
|
||||
def pg_bulk_create(self, *args, **kwargs):
|
||||
return self._decorate_method('pg_bulk_create', 'insert', args, kwargs)
|
||||
|
||||
|
||||
class ClickHouseSyncQuerySetMixin(ClickHouseSyncRegisterMixin):
|
||||
def update(self, **kwargs):
|
||||
# BUG I use update_returning method here. But it is not suitable for databases other then PostgreSQL
|
||||
# and requires django-pg-update-returning installed
|
||||
pk_name = self.model._meta.pk.name
|
||||
res = self.only(pk_name).update_returning(**kwargs)
|
||||
self._register_ops('update', res)
|
||||
return len(res)
|
||||
pks = update_returning_pk(self, kwargs)
|
||||
self._register_ops('update', pks)
|
||||
return len(pks)
|
||||
|
||||
def bulk_create(self, objs, batch_size=None):
|
||||
objs = super().bulk_create(objs, batch_size=batch_size)
|
||||
self._register_ops('insert', objs)
|
||||
return objs
|
||||
|
||||
def bulk_update(self, objs, *args, **kwargs):
|
||||
objs = list(objs)
|
||||
|
||||
# No need to register anything, if there are no objects.
|
||||
# If objects are not models, django-pg-bulk-update method is called and pg_bulk_update will register items
|
||||
if len(objs) == 0 or not isinstance(objs[0], DjangoModel):
|
||||
return super().bulk_update(objs, *args, **kwargs)
|
||||
|
||||
# native django bulk_update requires each object to have a primary key
|
||||
res = super().bulk_update(objs, *args, **kwargs)
|
||||
self._register_ops('update', objs)
|
||||
return res
|
||||
|
||||
|
||||
# I add library dependant mixins to base classes only if libraries are installed
|
||||
qs_bases = [ClickHouseSyncQuerySetMixin]
|
||||
|
|
@ -131,7 +146,7 @@ class ClickHouseSyncModel(DjangoModel):
|
|||
abstract = True
|
||||
|
||||
@classmethod
|
||||
def get_clickhouse_storage(cls): # type: () -> Storage
|
||||
def get_clickhouse_storage(cls) -> Storage:
|
||||
"""
|
||||
Returns Storage instance to save clickhouse sync data to
|
||||
:return:
|
||||
|
|
@ -140,8 +155,7 @@ class ClickHouseSyncModel(DjangoModel):
|
|||
return storage_cls()
|
||||
|
||||
@classmethod
|
||||
def register_clickhouse_sync_model(cls, model_cls):
|
||||
# type: (Type['django_clickhouse.clickhouse_models.ClickHouseModel']) -> None
|
||||
def register_clickhouse_sync_model(cls, model_cls: Type['ClickHouseModel']) -> None:
|
||||
"""
|
||||
Registers ClickHouse model to listen to this model updates
|
||||
:param model_cls: Model class to register
|
||||
|
|
@ -153,7 +167,7 @@ class ClickHouseSyncModel(DjangoModel):
|
|||
cls._clickhouse_sync_models.add(model_cls)
|
||||
|
||||
@classmethod
|
||||
def get_clickhouse_sync_models(cls): # type: () -> Set['django_clickhouse.clickhouse_models.ClickHouseModel']
|
||||
def get_clickhouse_sync_models(cls) -> Set['ClickHouseModel']:
|
||||
"""
|
||||
Returns all clickhouse models, listening to this class
|
||||
:return: A set of model classes to sync
|
||||
|
|
@ -161,8 +175,7 @@ class ClickHouseSyncModel(DjangoModel):
|
|||
return getattr(cls, '_clickhouse_sync_models', set())
|
||||
|
||||
@classmethod
|
||||
def register_clickhouse_operations(cls, operation, *model_pks, using=None):
|
||||
# type: (str, *Any, Optional[str]) -> None
|
||||
def register_clickhouse_operations(cls, operation: str, *model_pks: Any, using: Optional[str] = None) -> None:
|
||||
"""
|
||||
Registers model operation in storage
|
||||
:param operation: Operation type - one of [insert, update, delete)
|
||||
|
|
@ -170,7 +183,7 @@ class ClickHouseSyncModel(DjangoModel):
|
|||
:param using: Database alias registered instances are from
|
||||
:return: None
|
||||
"""
|
||||
model_pks = ['%s.%d' % (using or config.DEFAULT_DB_ALIAS, pk) for pk in model_pks]
|
||||
model_pks = ['%s.%s' % (using or config.DEFAULT_DB_ALIAS, pk) for pk in model_pks]
|
||||
|
||||
def _on_commit():
|
||||
for model_cls in cls.get_clickhouse_sync_models():
|
||||
|
|
@ -181,16 +194,16 @@ class ClickHouseSyncModel(DjangoModel):
|
|||
storage = cls.get_clickhouse_storage()
|
||||
transaction.on_commit(_on_commit, using=using)
|
||||
|
||||
def post_save(self, created, using=None): # type: (bool, Optional[str]) -> None
|
||||
def post_save(self, created: bool, using: Optional[str] = None) -> None:
|
||||
self.register_clickhouse_operations('insert' if created else 'update', self.pk, using=using)
|
||||
|
||||
def post_delete(self, using=None): # type: (Optional[str]) -> None
|
||||
def post_delete(self, using: Optional[str] = None) -> None:
|
||||
self.register_clickhouse_operations('delete', self.pk, using=using)
|
||||
|
||||
|
||||
@receiver(post_save)
|
||||
def post_save(sender, instance, **kwargs):
|
||||
statsd.incr('clickhouse.sync.post_save'.format('post_save'), 1)
|
||||
statsd.incr('%s.sync.post_save' % config.STATSD_PREFIX, 1)
|
||||
if issubclass(sender, ClickHouseSyncModel):
|
||||
instance.post_save(kwargs.get('created', False), using=kwargs.get('using'))
|
||||
|
||||
|
|
|
|||
|
|
@ -1,4 +1,4 @@
|
|||
from typing import Optional, Iterable, List
|
||||
from typing import Optional, Iterable, List, Type
|
||||
|
||||
from copy import copy
|
||||
from infi.clickhouse_orm.database import Database
|
||||
|
|
@ -13,22 +13,22 @@ class QuerySet(InfiQuerySet):
|
|||
Basic QuerySet to use
|
||||
"""
|
||||
|
||||
def __init__(self, model_cls, database=None): # type: (Type[InfiModel], Optional[Database]) -> None
|
||||
def __init__(self, model_cls: Type[InfiModel], database: Optional[Database] = None) -> None:
|
||||
super(QuerySet, self).__init__(model_cls, database)
|
||||
self._db_alias = None
|
||||
|
||||
@property
|
||||
def _database(self): # type: () -> Database
|
||||
def _database(self) -> Database:
|
||||
# HACK for correct work of all infi.clickhouse-orm methods
|
||||
# There are no write QuerySet methods now, so I use for_write=False by default
|
||||
return self.get_database(for_write=False)
|
||||
|
||||
@_database.setter
|
||||
def _database(self, database): # type: (Database) -> None
|
||||
def _database(self, database: Database) -> None:
|
||||
# HACK for correct work of all infi.clickhouse-orm methods
|
||||
self._db = database
|
||||
|
||||
def get_database(self, for_write=False): # type: (bool) -> Database
|
||||
def get_database(self, for_write: bool = False) -> Database:
|
||||
"""
|
||||
Gets database to execute query on. Looks for constructor or using() method.
|
||||
If nothing was set tries to get database from model class using router.
|
||||
|
|
@ -43,7 +43,7 @@ class QuerySet(InfiQuerySet):
|
|||
|
||||
return self._db
|
||||
|
||||
def using(self, db_alias): # type: (str) -> QuerySet
|
||||
def using(self, db_alias: str) -> 'QuerySet':
|
||||
"""
|
||||
Sets database alias to use for this query
|
||||
:param db_alias: Database alias name from CLICKHOUSE_DATABASES config option
|
||||
|
|
@ -54,7 +54,7 @@ class QuerySet(InfiQuerySet):
|
|||
qs._db = None # Previous database should be forgotten
|
||||
return qs
|
||||
|
||||
def all(self): # type: () -> QuerySet
|
||||
def all(self) -> 'QuerySet':
|
||||
"""
|
||||
Returns all items of queryset
|
||||
:return: QuerySet
|
||||
|
|
@ -70,7 +70,7 @@ class QuerySet(InfiQuerySet):
|
|||
self.get_database(for_write=True).insert([instance])
|
||||
return instance
|
||||
|
||||
def bulk_create(self, model_instances, batch_size=1000): # type: (Iterable[InfiModel], int) -> List[InfiModel]
|
||||
def bulk_create(self, model_instances: Iterable[InfiModel], batch_size: int = 1000) -> List[InfiModel]:
|
||||
self.get_database(for_write=True).insert(model_instances=model_instances, batch_size=batch_size)
|
||||
return list(model_instances)
|
||||
|
||||
|
|
|
|||
|
|
@ -1,7 +1,7 @@
|
|||
"""
|
||||
This file defines router to find appropriate database
|
||||
"""
|
||||
from typing import Optional
|
||||
from typing import Type
|
||||
|
||||
import random
|
||||
import six
|
||||
|
|
@ -13,8 +13,7 @@ from .utils import lazy_class_import
|
|||
|
||||
|
||||
class DefaultRouter:
|
||||
def db_for_read(self, model, **hints):
|
||||
# type: (ClickHouseModel, **dict) -> str
|
||||
def db_for_read(self, model: Type[ClickHouseModel], **hints) -> str:
|
||||
"""
|
||||
Gets database to read from for model
|
||||
:param model: Model to decide for
|
||||
|
|
@ -23,8 +22,7 @@ class DefaultRouter:
|
|||
"""
|
||||
return random.choice(model.read_db_aliases)
|
||||
|
||||
def db_for_write(self, model, **hints):
|
||||
# type: (ClickHouseModel, **dict) -> str
|
||||
def db_for_write(self, model: Type[ClickHouseModel], **hints) -> str:
|
||||
"""
|
||||
Gets database to write to for model
|
||||
:param model: Model to decide for
|
||||
|
|
@ -33,8 +31,8 @@ class DefaultRouter:
|
|||
"""
|
||||
return random.choice(model.write_db_aliases)
|
||||
|
||||
def allow_migrate(self, db_alias, app_label, operation, model=None, **hints):
|
||||
# type: (str, str, Operation, Optional[ClickHouseModel], **dict) -> bool
|
||||
def allow_migrate(self, db_alias: str, app_label: str, operation: Operation,
|
||||
model=None, **hints) -> bool:
|
||||
"""
|
||||
Checks if migration can be applied to given database
|
||||
:param db_alias: Database alias to check
|
||||
|
|
|
|||
|
|
@ -1,4 +1,4 @@
|
|||
from typing import NamedTuple
|
||||
from typing import NamedTuple, Optional, Iterable, Type
|
||||
|
||||
import pytz
|
||||
from django.db.models import Model as DjangoModel
|
||||
|
|
@ -7,7 +7,19 @@ from .utils import model_to_dict
|
|||
|
||||
|
||||
class Django2ClickHouseModelSerializer:
|
||||
def __init__(self, model_cls, fields=None, exclude_fields=None, writable=False, defaults=None):
|
||||
def __init__(self, model_cls: Type['ClickHouseModel'], fields: Optional[Iterable[str]] = None,
|
||||
exclude_fields: Optional[Iterable[str]] = None, writable: bool = False,
|
||||
defaults: Optional[dict] = None) -> None:
|
||||
"""
|
||||
Initializes serializer
|
||||
:param model_cls: ClickHouseModel subclass to serialize to
|
||||
:param fields: Optional. A list of fields to add into result tuple
|
||||
:param exclude_fields: Fields to exclude from result tuple
|
||||
:param writable: If fields parameter is not set directly,
|
||||
this flags determines if only writable or all fields should be taken from model_cls
|
||||
:param defaults: A dictionary of field: value which are taken as default values for model_cls instances
|
||||
:return: None
|
||||
"""
|
||||
self._model_cls = model_cls
|
||||
if fields is not None:
|
||||
self.serialize_fields = fields
|
||||
|
|
@ -18,7 +30,7 @@ class Django2ClickHouseModelSerializer:
|
|||
self._result_class = self._model_cls.get_tuple_class(defaults=defaults)
|
||||
self._fields = self._model_cls.fields(writable=False)
|
||||
|
||||
def _get_serialize_kwargs(self, obj):
|
||||
def _get_serialize_kwargs(self, obj: DjangoModel) -> dict:
|
||||
data = model_to_dict(obj, fields=self.serialize_fields, exclude_fields=self.exclude_serialize_fields)
|
||||
|
||||
# Remove None values, they should be initialized as defaults
|
||||
|
|
@ -29,5 +41,5 @@ class Django2ClickHouseModelSerializer:
|
|||
|
||||
return result
|
||||
|
||||
def serialize(self, obj): # type: (DjangoModel) -> NamedTuple
|
||||
def serialize(self, obj: DjangoModel) -> NamedTuple:
|
||||
return self._result_class(**self._get_serialize_kwargs(obj))
|
||||
|
|
|
|||
|
|
@ -39,7 +39,7 @@ class Storage:
|
|||
But ClickHouse is idempotent to duplicate inserts. So we can insert one batch twice correctly.
|
||||
"""
|
||||
|
||||
def pre_sync(self, import_key, **kwargs): # type: (str, **dict) -> None
|
||||
def pre_sync(self, import_key: str, **kwargs) -> None:
|
||||
"""
|
||||
This method is called before import process starts
|
||||
:param import_key: A key, returned by ClickHouseModel.get_import_key() method
|
||||
|
|
@ -48,7 +48,7 @@ class Storage:
|
|||
"""
|
||||
pass
|
||||
|
||||
def post_sync(self, import_key, **kwargs): # type: (str, **dict) -> None
|
||||
def post_sync(self, import_key: str, **kwargs) -> None:
|
||||
"""
|
||||
This method is called after import process has finished.
|
||||
:param import_key: A key, returned by ClickHouseModel.get_import_key() method
|
||||
|
|
@ -57,7 +57,7 @@ class Storage:
|
|||
"""
|
||||
pass
|
||||
|
||||
def post_sync_failed(self, import_key, **kwargs): # type: (str, **dict) -> None
|
||||
def post_sync_failed(self, import_key: str, **kwargs) -> None:
|
||||
"""
|
||||
This method is called after import process has finished with exception.
|
||||
:param import_key: A key, returned by ClickHouseModel.get_import_key() method
|
||||
|
|
@ -66,7 +66,7 @@ class Storage:
|
|||
"""
|
||||
pass
|
||||
|
||||
def post_batch_removed(self, import_key, batch_size): # type: (str, int) -> None
|
||||
def post_batch_removed(self, import_key: str, batch_size: int) -> None:
|
||||
"""
|
||||
This method marks that batch has been removed in statsd
|
||||
:param import_key: A key, returned by ClickHouseModel.get_import_key() method
|
||||
|
|
@ -76,8 +76,7 @@ class Storage:
|
|||
key = "%s.sync.%s.queue" % (config.STATSD_PREFIX, import_key)
|
||||
statsd.gauge(key, self.operations_count(import_key))
|
||||
|
||||
def operations_count(self, import_key, **kwargs):
|
||||
# type: (str, **dict) -> int
|
||||
def operations_count(self, import_key: str, **kwargs) -> int:
|
||||
"""
|
||||
Returns sync queue size
|
||||
:param import_key: A key, returned by ClickHouseModel.get_import_key() method
|
||||
|
|
@ -86,8 +85,7 @@ class Storage:
|
|||
"""
|
||||
raise NotImplemented()
|
||||
|
||||
def get_operations(self, import_key, count, **kwargs):
|
||||
# type: (str, int, **dict) -> List[Tuple[str, str]]
|
||||
def get_operations(self, import_key: str, count: int, **kwargs) -> List[Tuple[str, str]]:
|
||||
"""
|
||||
Must return a list of operations on the model.
|
||||
Method should be error safe - if something goes wrong, import data should not be lost.
|
||||
|
|
@ -98,7 +96,7 @@ class Storage:
|
|||
"""
|
||||
raise NotImplemented()
|
||||
|
||||
def register_operations(self, import_key, operation, *pks): # type: (str, str, *Any) -> int
|
||||
def register_operations(self, import_key: str, operation: str, *pks: Any) -> int:
|
||||
"""
|
||||
Registers new incoming operation
|
||||
:param import_key: A key, returned by ClickHouseModel.get_import_key() method
|
||||
|
|
@ -108,8 +106,7 @@ class Storage:
|
|||
"""
|
||||
raise NotImplementedError()
|
||||
|
||||
def register_operations_wrapped(self, import_key, operation, *pks):
|
||||
# type: (str, str, *Any) -> int
|
||||
def register_operations_wrapped(self, import_key: str, operation: str, *pks: Any) -> int:
|
||||
"""
|
||||
This is a wrapper for register_operation method, checking main parameters.
|
||||
This method should be called from inner functions.
|
||||
|
|
@ -140,14 +137,14 @@ class Storage:
|
|||
"""
|
||||
raise NotImplemented()
|
||||
|
||||
def get_last_sync_time(self, import_key): # type: (str) -> Optional[datetime.datetime]
|
||||
def get_last_sync_time(self, import_key: str) -> Optional[datetime.datetime]:
|
||||
"""
|
||||
Gets the last time, sync has been executed
|
||||
:return: datetime.datetime if last sync has been. Otherwise - None.
|
||||
"""
|
||||
raise NotImplemented()
|
||||
|
||||
def set_last_sync_time(self, import_key, dt): # type: (str, datetime.datetime) -> None
|
||||
def set_last_sync_time(self, import_key: str, dt: datetime.datetime) -> None:
|
||||
"""
|
||||
Sets successful sync time
|
||||
:return: None
|
||||
|
|
|
|||
|
|
@ -11,14 +11,14 @@ from .utils import get_subclasses
|
|||
|
||||
|
||||
@shared_task(queue=config.CELERY_QUEUE)
|
||||
def sync_clickhouse_model(cls): # type: (ClickHouseModel) -> None
|
||||
def sync_clickhouse_model(model_cls) -> None:
|
||||
"""
|
||||
Syncs one batch of given ClickHouseModel
|
||||
:param cls: ClickHouseModel subclass
|
||||
:param model_cls: ClickHouseModel subclass
|
||||
:return: None
|
||||
"""
|
||||
cls.get_storage().set_last_sync_time(cls.get_import_key(), datetime.datetime.now())
|
||||
cls.sync_batch_from_storage()
|
||||
model_cls.get_storage().set_last_sync_time(model_cls.get_import_key(), datetime.datetime.now())
|
||||
model_cls.sync_batch_from_storage()
|
||||
|
||||
|
||||
@shared_task(queue=config.CELERY_QUEUE)
|
||||
|
|
|
|||
|
|
@ -18,7 +18,7 @@ from .database import connections
|
|||
T = TypeVar('T')
|
||||
|
||||
|
||||
def get_tz_offset(db_alias=None): # type: (Optional[str]) -> int
|
||||
def get_tz_offset(db_alias: Optional[str] = None) -> int:
|
||||
"""
|
||||
Returns ClickHouse server timezone offset in minutes
|
||||
:param db_alias: The database alias used
|
||||
|
|
@ -28,8 +28,8 @@ def get_tz_offset(db_alias=None): # type: (Optional[str]) -> int
|
|||
return int(db.server_timezone.utcoffset(datetime.datetime.utcnow()).total_seconds() / 60)
|
||||
|
||||
|
||||
def format_datetime(dt, timezone_offset=0, day_end=False, db_alias=None):
|
||||
# type: (Union[datetime.date, datetime.datetime], int, bool, Optional[str]) -> str
|
||||
def format_datetime(dt: Union[datetime.date, datetime.datetime], timezone_offset: int = 0, day_end: bool = False,
|
||||
db_alias: Optional[str] = None) -> str:
|
||||
"""
|
||||
Formats datetime and date objects to format that can be used in WHERE conditions of query
|
||||
:param dt: datetime.datetime or datetime.date object
|
||||
|
|
@ -58,9 +58,9 @@ def format_datetime(dt, timezone_offset=0, day_end=False, db_alias=None):
|
|||
return server_dt.strftime("%Y-%m-%d %H:%M:%S")
|
||||
|
||||
|
||||
def module_exists(module_name): # type: (str) -> bool
|
||||
def module_exists(module_name: str) -> bool:
|
||||
"""
|
||||
Checks if moudle exists
|
||||
Checks if module exists
|
||||
:param module_name: Dot-separated module name
|
||||
:return: Boolean
|
||||
"""
|
||||
|
|
@ -69,7 +69,7 @@ def module_exists(module_name): # type: (str) -> bool
|
|||
return spam_spec is not None
|
||||
|
||||
|
||||
def lazy_class_import(obj): # type: (Union[str, Any]) -> Any
|
||||
def lazy_class_import(obj: Union[str, Any]) -> Any:
|
||||
"""
|
||||
If string is given, imports object by given module path.
|
||||
Otherwise returns the object
|
||||
|
|
@ -88,7 +88,7 @@ def lazy_class_import(obj): # type: (Union[str, Any]) -> Any
|
|||
return obj
|
||||
|
||||
|
||||
def get_subclasses(cls, recursive=False): # type: (T, bool) -> Set[T]
|
||||
def get_subclasses(cls: T, recursive: bool = False) -> Set[T]:
|
||||
"""
|
||||
Gets all subclasses of given class
|
||||
Attention!!! Classes would be found only if they were imported before using this function
|
||||
|
|
@ -105,8 +105,8 @@ def get_subclasses(cls, recursive=False): # type: (T, bool) -> Set[T]
|
|||
return subclasses
|
||||
|
||||
|
||||
def model_to_dict(instance, fields=None, exclude_fields=None):
|
||||
# type: (DjangoModel, Optional[Iterable[str]], Optional[Iterable[str]]) -> Dict[str, Any]
|
||||
def model_to_dict(instance: DjangoModel, fields: Optional[Iterable[str]] = None,
|
||||
exclude_fields: Optional[Iterable[str]] = None) -> Dict[str, Any]:
|
||||
"""
|
||||
Standard model_to_dict ignores some fields if they have invalid naming
|
||||
:param instance: Object to convert to dictionary
|
||||
|
|
|
|||
|
|
@ -2,10 +2,15 @@
|
|||
This file contains sample models to use in tests
|
||||
"""
|
||||
from django.db import models
|
||||
from django.db.models import QuerySet
|
||||
from django.db.models.manager import BaseManager
|
||||
from django_pg_returning import UpdateReturningModel
|
||||
|
||||
from django_clickhouse.models import ClickHouseSyncModel, ClickHouseSyncQuerySet
|
||||
from django_clickhouse.models import ClickHouseSyncModel, ClickHouseSyncQuerySet, ClickHouseSyncQuerySetMixin
|
||||
|
||||
|
||||
class NativeQuerySet(ClickHouseSyncQuerySetMixin, QuerySet):
|
||||
pass
|
||||
|
||||
|
||||
class TestQuerySet(ClickHouseSyncQuerySet):
|
||||
|
|
@ -16,8 +21,13 @@ class TestManager(BaseManager.from_queryset(TestQuerySet)):
|
|||
pass
|
||||
|
||||
|
||||
class NativeManager(BaseManager.from_queryset(NativeQuerySet)):
|
||||
pass
|
||||
|
||||
|
||||
class TestModel(UpdateReturningModel, ClickHouseSyncModel):
|
||||
objects = TestManager()
|
||||
native_objects = NativeManager()
|
||||
|
||||
value = models.IntegerField()
|
||||
created_date = models.DateField()
|
||||
|
|
@ -26,6 +36,7 @@ class TestModel(UpdateReturningModel, ClickHouseSyncModel):
|
|||
|
||||
class SecondaryTestModel(UpdateReturningModel, ClickHouseSyncModel):
|
||||
objects = TestManager()
|
||||
native_objects = NativeManager()
|
||||
|
||||
value = models.IntegerField()
|
||||
created_date = models.DateField()
|
||||
|
|
|
|||
|
|
@ -1,3 +1,6 @@
|
|||
import sys
|
||||
from unittest import skipIf
|
||||
|
||||
from django.test import TestCase
|
||||
|
||||
from django_clickhouse.compatibility import namedtuple
|
||||
|
|
@ -10,12 +13,16 @@ class NamedTupleTest(TestCase):
|
|||
self.assertTupleEqual((1, 2, 4), tuple(TestTuple(1, 2, 4)))
|
||||
self.assertTupleEqual((1, 2, 4), tuple(TestTuple(a=1, b=2, c=4)))
|
||||
|
||||
def test_exceptions(self):
|
||||
@skipIf(sys.version_info < (3, 7),
|
||||
"On python < 3.7 this error is not raised, as not given defaults are filled by None")
|
||||
def test_no_required_value(self):
|
||||
TestTuple = namedtuple('TestTuple', ('a', 'b', 'c'), defaults=[3])
|
||||
|
||||
# BUG On python < 3.7 this error is not raised, as not given defaults are filled by None
|
||||
# with self.assertRaises(TypeError):
|
||||
# TestTuple(b=1, c=4)
|
||||
with self.assertRaises(TypeError):
|
||||
TestTuple(b=1, c=4)
|
||||
|
||||
def test_duplicate_value(self):
|
||||
TestTuple = namedtuple('TestTuple', ('a', 'b', 'c'), defaults=[3])
|
||||
|
||||
with self.assertRaises(TypeError):
|
||||
TestTuple(1, 2, 3, c=4)
|
||||
|
|
|
|||
|
|
@ -1,6 +1,9 @@
|
|||
import datetime
|
||||
from unittest import skipIf
|
||||
|
||||
import django
|
||||
from django.test import TransactionTestCase
|
||||
from django.utils.timezone import now
|
||||
|
||||
from tests.clickhouse_models import ClickHouseTestModel, ClickHouseSecondTestModel, ClickHouseCollapseTestModel, \
|
||||
ClickHouseMultiTestModel
|
||||
|
|
@ -60,6 +63,76 @@ class TestOperations(TransactionTestCase):
|
|||
self.assertSetEqual({('insert', "%s.%d" % (self.db_alias, instance.pk)) for instance in items},
|
||||
set(self.storage.get_operations(self.clickhouse_model.get_import_key(), 10)))
|
||||
|
||||
@skipIf(django.VERSION < (2, 2), "bulk_update method has been introduced in django 2.2")
|
||||
def test_native_bulk_update(self):
|
||||
items = list(self.django_model.objects.filter(pk__in={1, 2}))
|
||||
for instance in items:
|
||||
instance.value = instance.pk * 10
|
||||
|
||||
self.django_model.native_objects.bulk_update(items, ['value'])
|
||||
|
||||
items = list(self.django_model.objects.filter(pk__in={1, 2}))
|
||||
self.assertEqual(2, len(items))
|
||||
for instance in items:
|
||||
self.assertEqual(instance.value, instance.pk * 10)
|
||||
|
||||
self.assertSetEqual({('update', "%s.%d" % (self.db_alias, instance.pk)) for instance in items},
|
||||
set(self.storage.get_operations(self.clickhouse_model.get_import_key(), 10)))
|
||||
|
||||
def test_pg_bulk_create(self):
|
||||
now_dt = now()
|
||||
res = self.django_model.objects.pg_bulk_create([
|
||||
{'value': i, 'created': now_dt, 'created_date': now_dt.date()}
|
||||
for i in range(5)
|
||||
])
|
||||
self.assertEqual(5, res)
|
||||
|
||||
items = list(self.django_model.objects.filter(value__lt=100).order_by('value'))
|
||||
self.assertEqual(5, len(items))
|
||||
for i, instance in enumerate(items):
|
||||
self.assertEqual(instance.created, now_dt)
|
||||
self.assertEqual(instance.created_date, now_dt.date())
|
||||
self.assertEqual(i, instance.value)
|
||||
|
||||
self.assertSetEqual({('insert', "%s.%d" % (self.db_alias, instance.pk)) for instance in items},
|
||||
set(self.storage.get_operations(self.clickhouse_model.get_import_key(), 10)))
|
||||
|
||||
def test_pg_bulk_update(self):
|
||||
items = list(self.django_model.objects.filter(pk__in={1, 2}))
|
||||
|
||||
self.django_model.objects.pg_bulk_update([
|
||||
{'id': instance.pk, 'value': instance.pk * 10}
|
||||
for instance in items
|
||||
])
|
||||
|
||||
items = list(self.django_model.objects.filter(pk__in={1, 2}))
|
||||
self.assertEqual(2, len(items))
|
||||
for instance in items:
|
||||
self.assertEqual(instance.value, instance.pk * 10)
|
||||
|
||||
self.assertSetEqual({('update', "%s.%d" % (self.db_alias, instance.pk)) for instance in items},
|
||||
set(self.storage.get_operations(self.clickhouse_model.get_import_key(), 10)))
|
||||
|
||||
def test_pg_bulk_update_or_create(self):
|
||||
items = list(self.django_model.objects.filter(pk__in={1, 2}))
|
||||
|
||||
data = [{
|
||||
'id': instance.pk,
|
||||
'value': instance.pk * 10,
|
||||
'created_date': instance.created_date,
|
||||
'created': instance.created
|
||||
} for instance in items] + [{'id': 11, 'value': 110, 'created_date': datetime.date.today(), 'created': now()}]
|
||||
|
||||
self.django_model.objects.pg_bulk_update_or_create(data)
|
||||
|
||||
items = list(self.django_model.objects.filter(pk__in={1, 2, 11}))
|
||||
self.assertEqual(3, len(items))
|
||||
for instance in items:
|
||||
self.assertEqual(instance.value, instance.pk * 10)
|
||||
|
||||
self.assertSetEqual({('update', "%s.%d" % (self.db_alias, instance.pk)) for instance in items},
|
||||
set(self.storage.get_operations(self.clickhouse_model.get_import_key(), 10)))
|
||||
|
||||
def test_get_or_create(self):
|
||||
instance, created = self.django_model.objects. \
|
||||
get_or_create(pk=100, defaults={'created_date': datetime.date.today(), 'created': datetime.datetime.now(),
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user