Birmingham-mumbai

Customizing APIRoute and Request

tải về 6.62 Mb.

Chế độ xem pdf

trang	269/275
Chuyển đổi dữ liệu	09.10.2023
Kích	6.62 Mb.
	#55278

1 ... 265 266 267 268 269 270 271 272 ... 275

Sherwin John Tragura - Building Python Microservices with FastAPI Build secure, scalable, and structured Python microservices from design concepts to infrastructure-Packt Publishing - ebooks Account

Managing body, form, or JSON data

Customizing APIRoute and Request
Middleware can process incoming
Request
data and outgoing
Response
objects of all API
methods in a FastAPI application, except that it cannot manipulate the message body, attach state
objects from the
Request
data, or modify the response object before the client consumes it. Only
APIRoute
and
Request
customization can give us a full grasp of how to control the request and
response transaction. The control might include determining whether the incoming data is a byte
body, form, or JSON and providing an effective logging mechanism, exception handling, content
transformation, and extraction.
Managing body, form, or JSON data
Unlike in middleware, customizing
APIRoute
does not apply to all the API endpoints. Implementing
APIRoute
for some
APIRouter
will only impose new routing rules to those affected endpoints,
while the other services can pursue the default request and response process. For instance, the
following customization is responsible for data extraction that only applies to the endpoints of
api.
route_extract.router
:
from fastapi.routing import APIRoute
from typing import Callable
from fastapi import Request, Response
class ExtractContentRoute(APIRoute):
def get_route_handler(self) -> Callable:
original_route_handler =
super().get_route_handler()
async def custom_route_handler(request: Request)
-> Response:
request = ExtractionRequest(request.scope,

Utilizing Other Advanced Features
298
request.receive)
response: Response =
await
original_route_handler(request)
return response
return custom_route_handler
Customizing
APIRoute
requires the creation of a Python
closure
that will directly manage the
Request
and
Response
flow from
APIRoute
’s
original_route_handler
. On the other
hand, our
ExtractContentRoute
filter uses a custom
ExtractionRequest
that identifies
and processes each type of incoming request data separately. The following is the implementation of
ExtractionRequest
that will replace the default
Request
object:

tải về 6.62 Mb.

Chia sẻ với bạn bè của bạn:

1 ... 265 266 267 268 269 270 271 272 ... 275