/
testclient.py
565 lines (484 loc) · 18.8 KB
/
testclient.py
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import asyncio
import contextlib
import http
import inspect
import io
import json
import math
import queue
import sys
import types
import typing
from concurrent.futures import Future
from urllib.parse import unquote, urljoin, urlsplit
import anyio.abc
import requests
from anyio.streams.stapled import StapledObjectStream
from starlette.types import Message, Receive, Scope, Send
from starlette.websockets import WebSocketDisconnect
if sys.version_info >= (3, 8): # pragma: no cover
from typing import Protocol, TypedDict # pragma: no cover
else: # pragma: no cover
from typing_extensions import Protocol, TypedDict # pragma: no cover
class _PortalFactoryType(Protocol):
def __call__(self) -> typing.ContextManager[anyio.abc.BlockingPortal]:
... # pragma: no cover
# Annotations for `Session.request()`
Cookies = typing.Union[
typing.MutableMapping[str, str], requests.cookies.RequestsCookieJar
]
Params = typing.Union[bytes, typing.MutableMapping[str, str]]
DataType = typing.Union[bytes, typing.MutableMapping[str, str], typing.IO]
TimeOut = typing.Union[float, typing.Tuple[float, float]]
FileType = typing.MutableMapping[str, typing.IO]
AuthType = typing.Union[
typing.Tuple[str, str],
requests.auth.AuthBase,
typing.Callable[[requests.PreparedRequest], requests.PreparedRequest],
]
ASGIInstance = typing.Callable[[Receive, Send], typing.Awaitable[None]]
ASGI2App = typing.Callable[[Scope], ASGIInstance]
ASGI3App = typing.Callable[[Scope, Receive, Send], typing.Awaitable[None]]
class _HeaderDict(requests.packages.urllib3._collections.HTTPHeaderDict):
def get_all(self, key: str, default: str) -> str:
return self.getheaders(key)
class _MockOriginalResponse:
"""
We have to jump through some hoops to present the response as if
it was made using urllib3.
"""
def __init__(self, headers: typing.List[typing.Tuple[bytes, bytes]]) -> None:
self.msg = _HeaderDict(headers)
self.closed = False
def isclosed(self) -> bool:
return self.closed
class _Upgrade(Exception):
def __init__(self, session: "WebSocketTestSession") -> None:
self.session = session
def _get_reason_phrase(status_code: int) -> str:
try:
return http.HTTPStatus(status_code).phrase
except ValueError:
return ""
def _is_asgi3(app: typing.Union[ASGI2App, ASGI3App]) -> bool:
if inspect.isclass(app):
return hasattr(app, "__await__")
elif inspect.isfunction(app):
return asyncio.iscoroutinefunction(app)
call = getattr(app, "__call__", None)
return asyncio.iscoroutinefunction(call)
class _WrapASGI2:
"""
Provide an ASGI3 interface onto an ASGI2 app.
"""
def __init__(self, app: ASGI2App) -> None:
self.app = app
async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
instance = self.app(scope)
await instance(receive, send)
class _AsyncBackend(TypedDict):
backend: str
backend_options: typing.Dict[str, typing.Any]
class _ASGIAdapter(requests.adapters.HTTPAdapter):
def __init__(
self,
app: ASGI3App,
portal_factory: _PortalFactoryType,
raise_server_exceptions: bool = True,
root_path: str = "",
) -> None:
self.app = app
self.raise_server_exceptions = raise_server_exceptions
self.root_path = root_path
self.portal_factory = portal_factory
def send(
self, request: requests.PreparedRequest, *args: typing.Any, **kwargs: typing.Any
) -> requests.Response:
scheme, netloc, path, query, fragment = (
str(item) for item in urlsplit(request.url)
)
default_port = {"http": 80, "ws": 80, "https": 443, "wss": 443}[scheme]
if ":" in netloc:
host, port_string = netloc.split(":", 1)
port = int(port_string)
else:
host = netloc
port = default_port
# Include the 'host' header.
if "host" in request.headers:
headers: typing.List[typing.Tuple[bytes, bytes]] = []
elif port == default_port:
headers = [(b"host", host.encode())]
else:
headers = [(b"host", (f"{host}:{port}").encode())]
# Include other request headers.
headers += [
(key.lower().encode(), value.encode())
for key, value in request.headers.items()
]
if scheme in {"ws", "wss"}:
subprotocol = request.headers.get("sec-websocket-protocol", None)
if subprotocol is None:
subprotocols: typing.Sequence[str] = []
else:
subprotocols = [value.strip() for value in subprotocol.split(",")]
scope = {
"type": "websocket",
"path": unquote(path),
"root_path": self.root_path,
"scheme": scheme,
"query_string": query.encode(),
"headers": headers,
"client": ["testclient", 50000],
"server": [host, port],
"subprotocols": subprotocols,
}
session = WebSocketTestSession(self.app, scope, self.portal_factory)
raise _Upgrade(session)
scope = {
"type": "http",
"http_version": "1.1",
"method": request.method,
"path": unquote(path),
"root_path": self.root_path,
"scheme": scheme,
"query_string": query.encode(),
"headers": headers,
"client": ["testclient", 50000],
"server": [host, port],
"extensions": {"http.response.template": {}},
}
request_complete = False
response_started = False
response_complete: anyio.Event
raw_kwargs: typing.Dict[str, typing.Any] = {"body": io.BytesIO()}
template = None
context = None
async def receive() -> Message:
nonlocal request_complete
if request_complete:
if not response_complete.is_set():
await response_complete.wait()
return {"type": "http.disconnect"}
body = request.body
if isinstance(body, str):
body_bytes: bytes = body.encode("utf-8")
elif body is None:
body_bytes = b""
elif isinstance(body, types.GeneratorType):
try:
chunk = body.send(None)
if isinstance(chunk, str):
chunk = chunk.encode("utf-8")
return {"type": "http.request", "body": chunk, "more_body": True}
except StopIteration:
request_complete = True
return {"type": "http.request", "body": b""}
else:
body_bytes = body
request_complete = True
return {"type": "http.request", "body": body_bytes}
async def send(message: Message) -> None:
nonlocal raw_kwargs, response_started, template, context
if message["type"] == "http.response.start":
assert (
not response_started
), 'Received multiple "http.response.start" messages.'
raw_kwargs["version"] = 11
raw_kwargs["status"] = message["status"]
raw_kwargs["reason"] = _get_reason_phrase(message["status"])
raw_kwargs["headers"] = [
(key.decode(), value.decode())
for key, value in message.get("headers", [])
]
raw_kwargs["preload_content"] = False
raw_kwargs["original_response"] = _MockOriginalResponse(
raw_kwargs["headers"]
)
response_started = True
elif message["type"] == "http.response.body":
assert (
response_started
), 'Received "http.response.body" without "http.response.start".'
assert (
not response_complete.is_set()
), 'Received "http.response.body" after response completed.'
body = message.get("body", b"")
more_body = message.get("more_body", False)
if request.method != "HEAD":
raw_kwargs["body"].write(body)
if not more_body:
raw_kwargs["body"].seek(0)
response_complete.set()
elif message["type"] == "http.response.template":
template = message["template"]
context = message["context"]
try:
with self.portal_factory() as portal:
response_complete = portal.call(anyio.Event)
portal.call(self.app, scope, receive, send)
except BaseException as exc:
if self.raise_server_exceptions:
raise exc
if self.raise_server_exceptions:
assert response_started, "TestClient did not receive any response."
elif not response_started:
raw_kwargs = {
"version": 11,
"status": 500,
"reason": "Internal Server Error",
"headers": [],
"preload_content": False,
"original_response": _MockOriginalResponse([]),
"body": io.BytesIO(),
}
raw = requests.packages.urllib3.HTTPResponse(**raw_kwargs)
response = self.build_response(request, raw)
if template is not None:
response.template = template
response.context = context
return response
class WebSocketTestSession:
def __init__(
self,
app: ASGI3App,
scope: Scope,
portal_factory: _PortalFactoryType,
) -> None:
self.app = app
self.scope = scope
self.accepted_subprotocol = None
self.portal_factory = portal_factory
self._receive_queue: "queue.Queue[typing.Any]" = queue.Queue()
self._send_queue: "queue.Queue[typing.Any]" = queue.Queue()
def __enter__(self) -> "WebSocketTestSession":
self.exit_stack = contextlib.ExitStack()
self.portal = self.exit_stack.enter_context(self.portal_factory())
try:
_: "Future[None]" = self.portal.start_task_soon(self._run)
self.send({"type": "websocket.connect"})
message = self.receive()
self._raise_on_close(message)
except Exception:
self.exit_stack.close()
raise
self.accepted_subprotocol = message.get("subprotocol", None)
return self
def __exit__(self, *args: typing.Any) -> None:
try:
self.close(1000)
finally:
self.exit_stack.close()
while not self._send_queue.empty():
message = self._send_queue.get()
if isinstance(message, BaseException):
raise message
async def _run(self) -> None:
"""
The sub-thread in which the websocket session runs.
"""
scope = self.scope
receive = self._asgi_receive
send = self._asgi_send
try:
await self.app(scope, receive, send)
except BaseException as exc:
self._send_queue.put(exc)
raise
async def _asgi_receive(self) -> Message:
while self._receive_queue.empty():
await anyio.sleep(0)
return self._receive_queue.get()
async def _asgi_send(self, message: Message) -> None:
self._send_queue.put(message)
def _raise_on_close(self, message: Message) -> None:
if message["type"] == "websocket.close":
raise WebSocketDisconnect(message.get("code", 1000))
def send(self, message: Message) -> None:
self._receive_queue.put(message)
def send_text(self, data: str) -> None:
self.send({"type": "websocket.receive", "text": data})
def send_bytes(self, data: bytes) -> None:
self.send({"type": "websocket.receive", "bytes": data})
def send_json(self, data: typing.Any, mode: str = "text") -> None:
assert mode in ["text", "binary"]
text = json.dumps(data)
if mode == "text":
self.send({"type": "websocket.receive", "text": text})
else:
self.send({"type": "websocket.receive", "bytes": text.encode("utf-8")})
def close(self, code: int = 1000) -> None:
self.send({"type": "websocket.disconnect", "code": code})
def receive(self) -> Message:
message = self._send_queue.get()
if isinstance(message, BaseException):
raise message
return message
def receive_text(self) -> str:
message = self.receive()
self._raise_on_close(message)
return message["text"]
def receive_bytes(self) -> bytes:
message = self.receive()
self._raise_on_close(message)
return message["bytes"]
def receive_json(self, mode: str = "text") -> typing.Any:
assert mode in ["text", "binary"]
message = self.receive()
self._raise_on_close(message)
if mode == "text":
text = message["text"]
else:
text = message["bytes"].decode("utf-8")
return json.loads(text)
class TestClient(requests.Session):
__test__ = False # For pytest to not discover this up.
task: "Future[None]"
portal: typing.Optional[anyio.abc.BlockingPortal] = None
def __init__(
self,
app: typing.Union[ASGI2App, ASGI3App],
base_url: str = "http://testserver",
raise_server_exceptions: bool = True,
root_path: str = "",
backend: str = "asyncio",
backend_options: typing.Optional[typing.Dict[str, typing.Any]] = None,
) -> None:
super().__init__()
self.async_backend = _AsyncBackend(
backend=backend, backend_options=backend_options or {}
)
if _is_asgi3(app):
app = typing.cast(ASGI3App, app)
asgi_app = app
else:
app = typing.cast(ASGI2App, app)
asgi_app = _WrapASGI2(app) # type: ignore
adapter = _ASGIAdapter(
asgi_app,
portal_factory=self._portal_factory,
raise_server_exceptions=raise_server_exceptions,
root_path=root_path,
)
self.mount("http://", adapter)
self.mount("https://", adapter)
self.mount("ws://", adapter)
self.mount("wss://", adapter)
self.headers.update({"user-agent": "testclient"})
self.app = asgi_app
self.base_url = base_url
@contextlib.contextmanager
def _portal_factory(
self,
) -> typing.Generator[anyio.abc.BlockingPortal, None, None]:
if self.portal is not None:
yield self.portal
else:
with anyio.start_blocking_portal(**self.async_backend) as portal:
yield portal
def request( # type: ignore
self,
method: str,
url: str,
params: Params = None,
data: DataType = None,
headers: typing.MutableMapping[str, str] = None,
cookies: Cookies = None,
files: FileType = None,
auth: AuthType = None,
timeout: TimeOut = None,
allow_redirects: bool = None,
proxies: typing.MutableMapping[str, str] = None,
hooks: typing.Any = None,
stream: bool = None,
verify: typing.Union[bool, str] = None,
cert: typing.Union[str, typing.Tuple[str, str]] = None,
json: typing.Any = None,
) -> requests.Response:
url = urljoin(self.base_url, url)
return super().request(
method,
url,
params=params,
data=data,
headers=headers,
cookies=cookies,
files=files,
auth=auth,
timeout=timeout,
allow_redirects=allow_redirects,
proxies=proxies,
hooks=hooks,
stream=stream,
verify=verify,
cert=cert,
json=json,
)
def websocket_connect(
self, url: str, subprotocols: typing.Sequence[str] = None, **kwargs: typing.Any
) -> typing.Any:
url = urljoin("ws://testserver", url)
headers = kwargs.get("headers", {})
headers.setdefault("connection", "upgrade")
headers.setdefault("sec-websocket-key", "testserver==")
headers.setdefault("sec-websocket-version", "13")
if subprotocols is not None:
headers.setdefault("sec-websocket-protocol", ", ".join(subprotocols))
kwargs["headers"] = headers
try:
super().request("GET", url, **kwargs)
except _Upgrade as exc:
session = exc.session
else:
raise RuntimeError("Expected WebSocket upgrade") # pragma: no cover
return session
def __enter__(self) -> "TestClient":
with contextlib.ExitStack() as stack:
self.portal = portal = stack.enter_context(
anyio.start_blocking_portal(**self.async_backend)
)
self.stream_send = StapledObjectStream(
*anyio.create_memory_object_stream(math.inf)
)
self.stream_receive = StapledObjectStream(
*anyio.create_memory_object_stream(math.inf)
)
self.task = portal.start_task_soon(self.lifespan)
portal.call(self.wait_startup)
self.portal = portal
@stack.callback
def reset_portal() -> None:
self.portal = None
@stack.callback
def wait_shutdown() -> None:
portal.call(self.wait_shutdown)
self.exit_stack = stack.pop_all()
return self
def __exit__(self, *args: typing.Any) -> None:
self.exit_stack.close()
async def lifespan(self) -> None:
scope = {"type": "lifespan"}
try:
await self.app(scope, self.stream_receive.receive, self.stream_send.send)
finally:
await self.stream_send.send(None)
async def wait_startup(self) -> None:
await self.stream_receive.send({"type": "lifespan.startup"})
message = await self.stream_send.receive()
if message is None:
self.task.result()
assert message["type"] in (
"lifespan.startup.complete",
"lifespan.startup.failed",
)
if message["type"] == "lifespan.startup.failed":
message = await self.stream_send.receive()
if message is None:
self.task.result()
async def wait_shutdown(self) -> None:
async with self.stream_send:
await self.stream_receive.send({"type": "lifespan.shutdown"})
message = await self.stream_send.receive()
if message is None:
self.task.result()
assert message["type"] == "lifespan.shutdown.complete"