Middlewares¶
Dazzler middleware acts on all dazzler pages and routes. They are used to modify the aiohttp requests context.
Postgres¶
dazzler.contrib.postgresql.PostgresMiddleware
Insert aiopg pool in the request context.
Install¶
pip install dazzler[postgresql]
Configure¶
Set the connection details with configuration or with environ POSTGRES_DSN:
[postgres]
dsn = 'host=localhost port=5432 dbname=dbname user=user password=pw'
Options to change the keys used for the request and application:
[postgres.middleware]
# Default values
request_key = 'postgres'
app_key = 'postgres'
Note
A PostgresMiddleware is automatically added to the application if using the session or authentication system with PostgreSQL.
Usage¶
Use in context:
@page.bind('value@input')
async def on_input(ctx: BindingContext):
pool = ctx.request['postgres']
async with pool.acquire() as conn:
async with conn.cursor() as cursor:
await cursor.execute('...')
See also
aiopg documentation: https://aiopg.readthedocs.io/
Redis¶
dazzler.contrib.redis.Redis
Insert aioredis pool in the request context.
Install¶
pip install dazzler[redis]
Configure¶
Set REDIS_URL environ variable to change the url used.
Note
Automatically added when the session backend is set to Redis
[session]
backend = 'Redis'
Usage¶
Use in context:
@page.bind('value@input')
async def on_value(ctx: BindingContext):
redis = ctx.request['redis']
Session¶
dazzler.system.session.SessionMiddleware
Insert a Session instance into the
request context. Automatically scoped to the current visitor.
Configure¶
Set the backend to use from the following options:
File, Redis, PostgreSQL.
[session]
backend = 'File'
Usage¶
Use with the context, directly available:
@page.bind('value@input')
async def on_input(ctx: BindingContext):
session_value = await ctx.session.get('key')
See also
Auth¶
dazzler.system.auth.AuthMiddleware
Adds the current user to the request.
Note
Automatically added when using the authentication system.
See also
Custom¶
Create custom middlewares by implementing dazzler.system.Middleware