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docs-fastapi/tests/test_dependency_after_yield_websockets.py
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Sync fastapi docs from b5ca1324 on 2025-12-07
2025-12-07 21:35:20 +00:00

80 lines
2.0 KiB
Python

from contextlib import contextmanager
from typing import Any, Generator
import pytest
from fastapi import Depends, FastAPI, WebSocket
from fastapi.testclient import TestClient
from typing_extensions import Annotated
class Session:
def __init__(self) -> None:
self.data = ["foo", "bar", "baz"]
self.open = True
def __iter__(self) -> Generator[str, None, None]:
for item in self.data:
if self.open:
yield item
else:
raise ValueError("Session closed")
@contextmanager
def acquire_session() -> Generator[Session, None, None]:
session = Session()
try:
yield session
finally:
session.open = False
def dep_session() -> Any:
with acquire_session() as s:
yield s
def broken_dep_session() -> Any:
with acquire_session() as s:
s.open = False
yield s
SessionDep = Annotated[Session, Depends(dep_session)]
BrokenSessionDep = Annotated[Session, Depends(broken_dep_session)]
app = FastAPI()
@app.websocket("/ws")
async def websocket_endpoint(websocket: WebSocket, session: SessionDep):
await websocket.accept()
for item in session:
await websocket.send_text(f"{item}")
@app.websocket("/ws-broken")
async def websocket_endpoint_broken(websocket: WebSocket, session: BrokenSessionDep):
await websocket.accept()
for item in session:
await websocket.send_text(f"{item}") # pragma no cover
client = TestClient(app)
def test_websocket_dependency_after_yield():
with client.websocket_connect("/ws") as websocket:
data = websocket.receive_text()
assert data == "foo"
data = websocket.receive_text()
assert data == "bar"
data = websocket.receive_text()
assert data == "baz"
def test_websocket_dependency_after_yield_broken():
with pytest.raises(ValueError, match="Session closed"):
with client.websocket_connect("/ws-broken"):
pass # pragma no cover