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from __future__ import annotations
import ssl
from math import inf
from typing import Any, Generator, Optional
import trio
from .task_group import TaskGroup
from .worker_context import WorkerContext
from ..config import Config
from ..events import Closed, Event, RawData, Updated
from ..protocol import ProtocolWrapper
from ..typing import AppWrapper
from ..utils import parse_socket_addr
MAX_RECV = 2**16
class TCPServer:
def __init__(
self, app: AppWrapper, config: Config, context: WorkerContext, stream: trio.abc.Stream
) -> None:
self.app = app
self.config = config
self.context = context
self.protocol: ProtocolWrapper
self.send_lock = trio.Lock()
self.idle_lock = trio.Lock()
self.stream = stream
self._idle_handle: Optional[trio.CancelScope] = None
def __await__(self) -> Generator[Any, None, None]:
return self.run().__await__()
async def run(self) -> None:
try:
try:
with trio.fail_after(self.config.ssl_handshake_timeout):
await self.stream.do_handshake()
except (trio.BrokenResourceError, trio.TooSlowError):
return # Handshake failed
alpn_protocol = self.stream.selected_alpn_protocol()
socket = self.stream.transport_stream.socket
tls = {"alpn_protocol": alpn_protocol}
client_certificate = self.stream.getpeercert(binary_form=False)
if client_certificate:
tls["client_cert_name"] = ", ".join(
[f"{part[0][0]}={part[0][1]}" for part in client_certificate["subject"]]
)
except AttributeError: # Not SSL
alpn_protocol = "http/1.1"
socket = self.stream.socket
tls = None
try:
client = parse_socket_addr(socket.family, socket.getpeername())
server = parse_socket_addr(socket.family, socket.getsockname())
async with TaskGroup() as task_group:
self._task_group = task_group
self.protocol = ProtocolWrapper(
self.app,
self.config,
self.context,
task_group,
tls,
client,
server,
self.protocol_send,
alpn_protocol,
self.stream,
)
await self.protocol.initiate()
await self._start_idle()
await self._read_data()
except OSError:
pass
finally:
await self._close()
async def protocol_send(self, event: Event) -> None:
if isinstance(event, RawData):
async with self.send_lock:
try:
with trio.CancelScope() as cancel_scope:
cancel_scope.shield = True
await self.stream.send_all(event.data)
except (trio.BrokenResourceError, trio.ClosedResourceError):
await self.protocol.handle(Closed())
elif isinstance(event, Closed):
await self._close()
await self.protocol.handle(Closed())
elif isinstance(event, Updated):
if event.idle:
await self._start_idle()
else:
await self._stop_idle()
async def _read_data(self) -> None:
while True:
try:
with trio.fail_after(self.config.read_timeout or inf):
data = await self.stream.receive_some(MAX_RECV)
except (
trio.ClosedResourceError,
trio.BrokenResourceError,
trio.TooSlowError,
):
break
else:
await self.protocol.handle(RawData(data))
if data == b"":
break
await self.protocol.handle(Closed())
async def _close(self) -> None:
try:
await self.stream.send_eof()
except (
trio.BrokenResourceError,
AttributeError,
trio.BusyResourceError,
trio.ClosedResourceError,
):
# They're already gone, nothing to do
# Or it is a SSL stream
pass
await self.stream.aclose()
async def _initiate_server_close(self) -> None:
await self.protocol.handle(Closed())
await self.stream.aclose()
async def _start_idle(self) -> None:
async with self.idle_lock:
if self._idle_handle is None:
self._idle_handle = await self._task_group._nursery.start(self._run_idle)
async def _stop_idle(self) -> None:
async with self.idle_lock:
if self._idle_handle is not None:
self._idle_handle.cancel()
self._idle_handle = None
async def _run_idle(
self,
task_status: trio._core._run._TaskStatus = trio.TASK_STATUS_IGNORED,
) -> None:
cancel_scope = trio.CancelScope()
task_status.started(cancel_scope)
with cancel_scope:
with trio.move_on_after(self.config.keep_alive_timeout):
await self.context.terminated.wait()
cancel_scope.shield = True
await self._initiate_server_close()
|
