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import json
from typing import Dict
import pytest
from fastapi import BackgroundTasks, Depends, FastAPI
from fastapi.responses import StreamingResponse
from fastapi.testclient import TestClient
app = FastAPI()
state = {
"/async": "asyncgen not started",
"/sync": "generator not started",
"/async_raise": "asyncgen raise not started",
"/sync_raise": "generator raise not started",
"context_a": "not started a",
"context_b": "not started b",
"bg": "not set",
"sync_bg": "not set",
}
errors = []
async def get_state():
return state
class AsyncDependencyError(Exception):
pass
class SyncDependencyError(Exception):
pass
class OtherDependencyError(Exception):
pass
async def asyncgen_state(state: Dict[str, str] = Depends(get_state)):
state["/async"] = "asyncgen started"
yield state["/async"]
state["/async"] = "asyncgen completed"
def generator_state(state: Dict[str, str] = Depends(get_state)):
state["/sync"] = "generator started"
yield state["/sync"]
state["/sync"] = "generator completed"
async def asyncgen_state_try(state: Dict[str, str] = Depends(get_state)):
state["/async_raise"] = "asyncgen raise started"
try:
yield state["/async_raise"]
except AsyncDependencyError:
errors.append("/async_raise")
raise
finally:
state["/async_raise"] = "asyncgen raise finalized"
def generator_state_try(state: Dict[str, str] = Depends(get_state)):
state["/sync_raise"] = "generator raise started"
try:
yield state["/sync_raise"]
except SyncDependencyError:
errors.append("/sync_raise")
raise
finally:
state["/sync_raise"] = "generator raise finalized"
async def context_a(state: dict = Depends(get_state)):
state["context_a"] = "started a"
try:
yield state
finally:
state["context_a"] = "finished a"
async def context_b(state: dict = Depends(context_a)):
state["context_b"] = "started b"
try:
yield state
finally:
state["context_b"] = f"finished b with a: {state['context_a']}"
@app.get("/async")
async def get_async(state: str = Depends(asyncgen_state)):
return state
@app.get("/sync")
async def get_sync(state: str = Depends(generator_state)):
return state
@app.get("/async_raise")
async def get_async_raise(state: str = Depends(asyncgen_state_try)):
assert state == "asyncgen raise started"
raise AsyncDependencyError()
@app.get("/sync_raise")
async def get_sync_raise(state: str = Depends(generator_state_try)):
assert state == "generator raise started"
raise SyncDependencyError()
@app.get("/async_raise_other")
async def get_async_raise_other(state: str = Depends(asyncgen_state_try)):
assert state == "asyncgen raise started"
raise OtherDependencyError()
@app.get("/sync_raise_other")
async def get_sync_raise_other(state: str = Depends(generator_state_try)):
assert state == "generator raise started"
raise OtherDependencyError()
@app.get("/context_b")
async def get_context_b(state: dict = Depends(context_b)):
return state
@app.get("/context_b_raise")
async def get_context_b_raise(state: dict = Depends(context_b)):
assert state["context_b"] == "started b"
assert state["context_a"] == "started a"
raise OtherDependencyError()
@app.get("/context_b_bg")
async def get_context_b_bg(tasks: BackgroundTasks, state: dict = Depends(context_b)):
async def bg(state: dict):
state["bg"] = f"bg set - b: {state['context_b']} - a: {state['context_a']}"
tasks.add_task(bg, state)
return state
# Sync versions
@app.get("/sync_async")
def get_sync_async(state: str = Depends(asyncgen_state)):
return state
@app.get("/sync_sync")
def get_sync_sync(state: str = Depends(generator_state)):
return state
@app.get("/sync_async_raise")
def get_sync_async_raise(state: str = Depends(asyncgen_state_try)):
assert state == "asyncgen raise started"
raise AsyncDependencyError()
@app.get("/sync_sync_raise")
def get_sync_sync_raise(state: str = Depends(generator_state_try)):
assert state == "generator raise started"
raise SyncDependencyError()
@app.get("/sync_async_raise_other")
def get_sync_async_raise_other(state: str = Depends(asyncgen_state_try)):
assert state == "asyncgen raise started"
raise OtherDependencyError()
@app.get("/sync_sync_raise_other")
def get_sync_sync_raise_other(state: str = Depends(generator_state_try)):
assert state == "generator raise started"
raise OtherDependencyError()
@app.get("/sync_context_b")
def get_sync_context_b(state: dict = Depends(context_b)):
return state
@app.get("/sync_context_b_raise")
def get_sync_context_b_raise(state: dict = Depends(context_b)):
assert state["context_b"] == "started b"
assert state["context_a"] == "started a"
raise OtherDependencyError()
@app.get("/sync_context_b_bg")
async def get_sync_context_b_bg(
tasks: BackgroundTasks, state: dict = Depends(context_b)
):
async def bg(state: dict):
state["sync_bg"] = (
f"sync_bg set - b: {state['context_b']} - a: {state['context_a']}"
)
tasks.add_task(bg, state)
return state
@app.middleware("http")
async def middleware(request, call_next):
response: StreamingResponse = await call_next(request)
response.headers["x-state"] = json.dumps(state.copy())
return response
client = TestClient(app)
def test_async_state():
assert state["/async"] == "asyncgen not started"
response = client.get("/async")
assert response.status_code == 200, response.text
assert response.json() == "asyncgen started"
assert state["/async"] == "asyncgen completed"
def test_sync_state():
assert state["/sync"] == "generator not started"
response = client.get("/sync")
assert response.status_code == 200, response.text
assert response.json() == "generator started"
assert state["/sync"] == "generator completed"
def test_async_raise_other():
assert state["/async_raise"] == "asyncgen raise not started"
with pytest.raises(OtherDependencyError):
client.get("/async_raise_other")
assert state["/async_raise"] == "asyncgen raise finalized"
assert "/async_raise" not in errors
def test_sync_raise_other():
assert state["/sync_raise"] == "generator raise not started"
with pytest.raises(OtherDependencyError):
client.get("/sync_raise_other")
assert state["/sync_raise"] == "generator raise finalized"
assert "/sync_raise" not in errors
def test_async_raise_raises():
with pytest.raises(AsyncDependencyError):
client.get("/async_raise")
assert state["/async_raise"] == "asyncgen raise finalized"
assert "/async_raise" in errors
errors.clear()
def test_async_raise_server_error():
client = TestClient(app, raise_server_exceptions=False)
response = client.get("/async_raise")
assert response.status_code == 500, response.text
assert state["/async_raise"] == "asyncgen raise finalized"
assert "/async_raise" in errors
errors.clear()
def test_context_b():
response = client.get("/context_b")
data = response.json()
assert data["context_b"] == "started b"
assert data["context_a"] == "started a"
assert state["context_b"] == "finished b with a: started a"
assert state["context_a"] == "finished a"
def test_context_b_raise():
with pytest.raises(OtherDependencyError):
client.get("/context_b_raise")
assert state["context_b"] == "finished b with a: started a"
assert state["context_a"] == "finished a"
def test_background_tasks():
response = client.get("/context_b_bg")
data = response.json()
assert data["context_b"] == "started b"
assert data["context_a"] == "started a"
assert data["bg"] == "not set"
middleware_state = json.loads(response.headers["x-state"])
assert middleware_state["context_b"] == "started b"
assert middleware_state["context_a"] == "started a"
assert middleware_state["bg"] == "not set"
assert state["context_b"] == "finished b with a: started a"
assert state["context_a"] == "finished a"
assert state["bg"] == "bg set - b: started b - a: started a"
def test_sync_raise_raises():
with pytest.raises(SyncDependencyError):
client.get("/sync_raise")
assert state["/sync_raise"] == "generator raise finalized"
assert "/sync_raise" in errors
errors.clear()
def test_sync_raise_server_error():
client = TestClient(app, raise_server_exceptions=False)
response = client.get("/sync_raise")
assert response.status_code == 500, response.text
assert state["/sync_raise"] == "generator raise finalized"
assert "/sync_raise" in errors
errors.clear()
def test_sync_async_state():
response = client.get("/sync_async")
assert response.status_code == 200, response.text
assert response.json() == "asyncgen started"
assert state["/async"] == "asyncgen completed"
def test_sync_sync_state():
response = client.get("/sync_sync")
assert response.status_code == 200, response.text
assert response.json() == "generator started"
assert state["/sync"] == "generator completed"
def test_sync_async_raise_other():
with pytest.raises(OtherDependencyError):
client.get("/sync_async_raise_other")
assert state["/async_raise"] == "asyncgen raise finalized"
assert "/async_raise" not in errors
def test_sync_sync_raise_other():
with pytest.raises(OtherDependencyError):
client.get("/sync_sync_raise_other")
assert state["/sync_raise"] == "generator raise finalized"
assert "/sync_raise" not in errors
def test_sync_async_raise_raises():
with pytest.raises(AsyncDependencyError):
client.get("/sync_async_raise")
assert state["/async_raise"] == "asyncgen raise finalized"
assert "/async_raise" in errors
errors.clear()
def test_sync_async_raise_server_error():
client = TestClient(app, raise_server_exceptions=False)
response = client.get("/sync_async_raise")
assert response.status_code == 500, response.text
assert state["/async_raise"] == "asyncgen raise finalized"
assert "/async_raise" in errors
errors.clear()
def test_sync_sync_raise_raises():
with pytest.raises(SyncDependencyError):
client.get("/sync_sync_raise")
assert state["/sync_raise"] == "generator raise finalized"
assert "/sync_raise" in errors
errors.clear()
def test_sync_sync_raise_server_error():
client = TestClient(app, raise_server_exceptions=False)
response = client.get("/sync_sync_raise")
assert response.status_code == 500, response.text
assert state["/sync_raise"] == "generator raise finalized"
assert "/sync_raise" in errors
errors.clear()
def test_sync_context_b():
response = client.get("/sync_context_b")
data = response.json()
assert data["context_b"] == "started b"
assert data["context_a"] == "started a"
assert state["context_b"] == "finished b with a: started a"
assert state["context_a"] == "finished a"
def test_sync_context_b_raise():
with pytest.raises(OtherDependencyError):
client.get("/sync_context_b_raise")
assert state["context_b"] == "finished b with a: started a"
assert state["context_a"] == "finished a"
def test_sync_background_tasks():
response = client.get("/sync_context_b_bg")
data = response.json()
assert data["context_b"] == "started b"
assert data["context_a"] == "started a"
assert data["sync_bg"] == "not set"
assert state["context_b"] == "finished b with a: started a"
assert state["context_a"] == "finished a"
assert state["sync_bg"] == "sync_bg set - b: started b - a: started a"
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