🛃 📨 & APIRoute 🎓

💼, 👆 5️⃣📆 💚 🔐 ⚛ ⚙️ Request & APIRoute 🎓.

🎯, 👉 5️⃣📆 👍 🎛 ⚛ 🛠️.

🖼, 🚥 👆 💚 ✍ ⚖️ 🔬 📨 💪 ⏭ ⚫️ 🛠️ 👆 🈸.

Danger

👉 "🏧" ⚒.

🚥 👆 ▶️ ⏮️ FastAPI 👆 💪 💚 🚶 👉 📄.

⚙️ 💼

⚙️ 💼 🔌:

• 🏭 🚫-🎻 📨 💪 🎻 (✅ msgpack).
• 🗜 🗜-🗜 📨 💪.
• 🔁 🚨 🌐 📨 💪.

🚚 🛃 📨 💪 🔢

➡️ 👀 ❔ ⚒ ⚙️ 🛃 Request 🏿 🗜 🗜 📨.

& APIRoute 🏿 ⚙️ 👈 🛃 📨 🎓.

✍ 🛃 GzipRequest 🎓

Tip

👉 🧸 🖼 🎦 ❔ ⚫️ 👷, 🚥 👆 💪 🗜 🐕‍🦺, 👆 💪 ⚙️ 🚚 GzipMiddleware.

🥇, 👥 ✍ GzipRequest 🎓, ❔ 🔜 📁 Request.body() 👩‍🔬 🗜 💪 🔍 ☑ 🎚.

🚥 📤 🙅‍♂ gzip 🎚, ⚫️ 🔜 🚫 🔄 🗜 💪.

👈 🌌, 🎏 🛣 🎓 💪 🍵 🗜 🗜 ⚖️ 🗜 📨.

import gzip
from typing import Callable, List

from fastapi import Body, FastAPI, Request, Response
from fastapi.routing import APIRoute


class GzipRequest(Request):
    async def body(self) -> bytes:
        if not hasattr(self, "_body"):
            body = await super().body()
            if "gzip" in self.headers.getlist("Content-Encoding"):
                body = gzip.decompress(body)
            self._body = body
        return self._body


class GzipRoute(APIRoute):
    def get_route_handler(self) -> Callable:
        original_route_handler = super().get_route_handler()

        async def custom_route_handler(request: Request) -> Response:
            request = GzipRequest(request.scope, request.receive)
            return await original_route_handler(request)

        return custom_route_handler


app = FastAPI()
app.router.route_class = GzipRoute


@app.post("/sum")
async def sum_numbers(numbers: List[int] = Body()):
    return {"sum": sum(numbers)}

✍ 🛃 GzipRoute 🎓

⏭, 👥 ✍ 🛃 🏿 fastapi.routing.APIRoute 👈 🔜 ⚒ ⚙️ GzipRequest.

👉 🕰, ⚫️ 🔜 📁 👩‍🔬 APIRoute.get_route_handler().

👉 👩‍🔬 📨 🔢. & 👈 🔢 ⚫️❔ 🔜 📨 📨 & 📨 📨.

📥 👥 ⚙️ ⚫️ ✍ GzipRequest ⚪️➡️ ⏮️ 📨.

import gzip
from typing import Callable, List

from fastapi import Body, FastAPI, Request, Response
from fastapi.routing import APIRoute


class GzipRequest(Request):
    async def body(self) -> bytes:
        if not hasattr(self, "_body"):
            body = await super().body()
            if "gzip" in self.headers.getlist("Content-Encoding"):
                body = gzip.decompress(body)
            self._body = body
        return self._body


class GzipRoute(APIRoute):
    def get_route_handler(self) -> Callable:
        original_route_handler = super().get_route_handler()

        async def custom_route_handler(request: Request) -> Response:
            request = GzipRequest(request.scope, request.receive)
            return await original_route_handler(request)

        return custom_route_handler


app = FastAPI()
app.router.route_class = GzipRoute


@app.post("/sum")
async def sum_numbers(numbers: List[int] = Body()):
    return {"sum": sum(numbers)}

📡 ℹ

Request ✔️ request.scope 🔢, 👈 🐍 dict ⚗ 🗃 🔗 📨.

Request ✔️ request.receive, 👈 🔢 "📨" 💪 📨.

scope dict & receive 🔢 👯‍♂️ 🍕 🔫 🔧.

& 👈 2️⃣ 👜, scope & receive, ⚫️❔ 💪 ✍ 🆕 Request 👐.

💡 🌅 🔃 Request ✅ 💃 🩺 🔃 📨.

🕴 👜 🔢 📨 GzipRequest.get_route_handler 🔨 🎏 🗜 Request GzipRequest.

🔨 👉, 👆 GzipRequest 🔜 ✊ 💅 🗜 📊 (🚥 💪) ⏭ 🚶‍♀️ ⚫️ 👆 ➡ 🛠️.

⏮️ 👈, 🌐 🏭 ⚛ 🎏.

✋️ ↩️ 👆 🔀 GzipRequest.body, 📨 💪 🔜 🔁 🗜 🕐❔ ⚫️ 📐 FastAPI 🕐❔ 💪.

🔐 📨 💪 ⚠ 🐕‍🦺

Tip

❎ 👉 🎏 ⚠, ⚫️ 🎲 📚 ⏩ ⚙️ body 🛃 🐕‍🦺 RequestValidationError (🚚 ❌).

✋️ 👉 🖼 ☑ & ⚫️ 🎦 ❔ 🔗 ⏮️ 🔗 🦲.

👥 💪 ⚙️ 👉 🎏 🎯 🔐 📨 💪 ⚠ 🐕‍🦺.

🌐 👥 💪 🍵 📨 🔘 try/except 🍫:

from typing import Callable, List

from fastapi import Body, FastAPI, HTTPException, Request, Response
from fastapi.exceptions import RequestValidationError
from fastapi.routing import APIRoute


class ValidationErrorLoggingRoute(APIRoute):
    def get_route_handler(self) -> Callable:
        original_route_handler = super().get_route_handler()

        async def custom_route_handler(request: Request) -> Response:
            try:
                return await original_route_handler(request)
            except RequestValidationError as exc:
                body = await request.body()
                detail = {"errors": exc.errors(), "body": body.decode()}
                raise HTTPException(status_code=422, detail=detail)

        return custom_route_handler


app = FastAPI()
app.router.route_class = ValidationErrorLoggingRoute


@app.post("/")
async def sum_numbers(numbers: List[int] = Body()):
    return sum(numbers)

🚥 ⚠ 📉, Request 👐 🔜 ↔, 👥 💪 ✍ & ⚒ ⚙️ 📨 💪 🕐❔ 🚚 ❌:

from typing import Callable, List

from fastapi import Body, FastAPI, HTTPException, Request, Response
from fastapi.exceptions import RequestValidationError
from fastapi.routing import APIRoute


class ValidationErrorLoggingRoute(APIRoute):
    def get_route_handler(self) -> Callable:
        original_route_handler = super().get_route_handler()

        async def custom_route_handler(request: Request) -> Response:
            try:
                return await original_route_handler(request)
            except RequestValidationError as exc:
                body = await request.body()
                detail = {"errors": exc.errors(), "body": body.decode()}
                raise HTTPException(status_code=422, detail=detail)

        return custom_route_handler


app = FastAPI()
app.router.route_class = ValidationErrorLoggingRoute


@app.post("/")
async def sum_numbers(numbers: List[int] = Body()):
    return sum(numbers)

🛃 APIRoute 🎓 📻

👆 💪 ⚒ route_class 🔢 APIRouter:

import time
from typing import Callable

from fastapi import APIRouter, FastAPI, Request, Response
from fastapi.routing import APIRoute


class TimedRoute(APIRoute):
    def get_route_handler(self) -> Callable:
        original_route_handler = super().get_route_handler()

        async def custom_route_handler(request: Request) -> Response:
            before = time.time()
            response: Response = await original_route_handler(request)
            duration = time.time() - before
            response.headers["X-Response-Time"] = str(duration)
            print(f"route duration: {duration}")
            print(f"route response: {response}")
            print(f"route response headers: {response.headers}")
            return response

        return custom_route_handler


app = FastAPI()
router = APIRouter(route_class=TimedRoute)


@app.get("/")
async def not_timed():
    return {"message": "Not timed"}


@router.get("/timed")
async def timed():
    return {"message": "It's the time of my life"}


app.include_router(router)

👉 🖼, ➡ 🛠️ 🔽 router 🔜 ⚙️ 🛃 TimedRoute 🎓, & 🔜 ✔️ ➕ X-Response-Time 🎚 📨 ⏮️ 🕰 ⚫️ ✊ 🏗 📨:

import time
from typing import Callable

from fastapi import APIRouter, FastAPI, Request, Response
from fastapi.routing import APIRoute


class TimedRoute(APIRoute):
    def get_route_handler(self) -> Callable:
        original_route_handler = super().get_route_handler()

        async def custom_route_handler(request: Request) -> Response:
            before = time.time()
            response: Response = await original_route_handler(request)
            duration = time.time() - before
            response.headers["X-Response-Time"] = str(duration)
            print(f"route duration: {duration}")
            print(f"route response: {response}")
            print(f"route response headers: {response.headers}")
            return response

        return custom_route_handler


app = FastAPI()
router = APIRouter(route_class=TimedRoute)


@app.get("/")
async def not_timed():
    return {"message": "Not timed"}


@router.get("/timed")
async def timed():
    return {"message": "It's the time of my life"}


app.include_router(router)