two version of R2R are here HEAD master

1 files changed, 246 insertions, 0 deletions

diff --git a/.venv/lib/python3.12/site-packages/dns/quic/_trio.py b/.venv/lib/python3.12/site-packages/dns/quic/_trio.py
new file mode 100644
index 00000000..ae79f369
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/dns/quic/_trio.py
@@ -0,0 +1,246 @@
+# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
+
+import socket
+import ssl
+import struct
+import time
+
+import aioquic.quic.configuration  # type: ignore
+import aioquic.quic.connection  # type: ignore
+import aioquic.quic.events  # type: ignore
+import trio
+
+import dns.exception
+import dns.inet
+from dns._asyncbackend import NullContext
+from dns.quic._common import (
+    QUIC_MAX_DATAGRAM,
+    AsyncQuicConnection,
+    AsyncQuicManager,
+    BaseQuicStream,
+    UnexpectedEOF,
+)
+
+
+class TrioQuicStream(BaseQuicStream):
+    def __init__(self, connection, stream_id):
+        super().__init__(connection, stream_id)
+        self._wake_up = trio.Condition()
+
+    async def wait_for(self, amount):
+        while True:
+            if self._buffer.have(amount):
+                return
+            self._expecting = amount
+            async with self._wake_up:
+                await self._wake_up.wait()
+            self._expecting = 0
+
+    async def wait_for_end(self):
+        while True:
+            if self._buffer.seen_end():
+                return
+            async with self._wake_up:
+                await self._wake_up.wait()
+
+    async def receive(self, timeout=None):
+        if timeout is None:
+            context = NullContext(None)
+        else:
+            context = trio.move_on_after(timeout)
+        with context:
+            if self._connection.is_h3():
+                await self.wait_for_end()
+                return self._buffer.get_all()
+            else:
+                await self.wait_for(2)
+                (size,) = struct.unpack("!H", self._buffer.get(2))
+                await self.wait_for(size)
+                return self._buffer.get(size)
+        raise dns.exception.Timeout
+
+    async def send(self, datagram, is_end=False):
+        data = self._encapsulate(datagram)
+        await self._connection.write(self._stream_id, data, is_end)
+
+    async def _add_input(self, data, is_end):
+        if self._common_add_input(data, is_end):
+            async with self._wake_up:
+                self._wake_up.notify()
+
+    async def close(self):
+        self._close()
+
+    # Streams are async context managers
+
+    async def __aenter__(self):
+        return self
+
+    async def __aexit__(self, exc_type, exc_val, exc_tb):
+        await self.close()
+        async with self._wake_up:
+            self._wake_up.notify()
+        return False
+
+
+class TrioQuicConnection(AsyncQuicConnection):
+    def __init__(self, connection, address, port, source, source_port, manager=None):
+        super().__init__(connection, address, port, source, source_port, manager)
+        self._socket = trio.socket.socket(self._af, socket.SOCK_DGRAM, 0)
+        self._handshake_complete = trio.Event()
+        self._run_done = trio.Event()
+        self._worker_scope = None
+        self._send_pending = False
+
+    async def _worker(self):
+        try:
+            if self._source:
+                await self._socket.bind(
+                    dns.inet.low_level_address_tuple(self._source, self._af)
+                )
+            await self._socket.connect(self._peer)
+            while not self._done:
+                (expiration, interval) = self._get_timer_values(False)
+                if self._send_pending:
+                    # Do not block forever if sends are pending.  Even though we
+                    # have a wake-up mechanism if we've already started the blocking
+                    # read, the possibility of context switching in send means that
+                    # more writes can happen while we have no wake up context, so
+                    # we need self._send_pending to avoid (effectively) a "lost wakeup"
+                    # race.
+                    interval = 0.0
+                with trio.CancelScope(
+                    deadline=trio.current_time() + interval
+                ) as self._worker_scope:
+                    datagram = await self._socket.recv(QUIC_MAX_DATAGRAM)
+                    self._connection.receive_datagram(datagram, self._peer, time.time())
+                self._worker_scope = None
+                self._handle_timer(expiration)
+                await self._handle_events()
+                # We clear this now, before sending anything, as sending can cause
+                # context switches that do more sends.  We want to know if that
+                # happens so we don't block a long time on the recv() above.
+                self._send_pending = False
+                datagrams = self._connection.datagrams_to_send(time.time())
+                for datagram, _ in datagrams:
+                    await self._socket.send(datagram)
+        finally:
+            self._done = True
+            self._socket.close()
+            self._handshake_complete.set()
+
+    async def _handle_events(self):
+        count = 0
+        while True:
+            event = self._connection.next_event()
+            if event is None:
+                return
+            if isinstance(event, aioquic.quic.events.StreamDataReceived):
+                if self.is_h3():
+                    h3_events = self._h3_conn.handle_event(event)
+                    for h3_event in h3_events:
+                        if isinstance(h3_event, aioquic.h3.events.HeadersReceived):
+                            stream = self._streams.get(event.stream_id)
+                            if stream:
+                                if stream._headers is None:
+                                    stream._headers = h3_event.headers
+                                elif stream._trailers is None:
+                                    stream._trailers = h3_event.headers
+                                if h3_event.stream_ended:
+                                    await stream._add_input(b"", True)
+                        elif isinstance(h3_event, aioquic.h3.events.DataReceived):
+                            stream = self._streams.get(event.stream_id)
+                            if stream:
+                                await stream._add_input(
+                                    h3_event.data, h3_event.stream_ended
+                                )
+                else:
+                    stream = self._streams.get(event.stream_id)
+                    if stream:
+                        await stream._add_input(event.data, event.end_stream)
+            elif isinstance(event, aioquic.quic.events.HandshakeCompleted):
+                self._handshake_complete.set()
+            elif isinstance(event, aioquic.quic.events.ConnectionTerminated):
+                self._done = True
+                self._socket.close()
+            elif isinstance(event, aioquic.quic.events.StreamReset):
+                stream = self._streams.get(event.stream_id)
+                if stream:
+                    await stream._add_input(b"", True)
+            count += 1
+            if count > 10:
+                # yield
+                count = 0
+                await trio.sleep(0)
+
+    async def write(self, stream, data, is_end=False):
+        self._connection.send_stream_data(stream, data, is_end)
+        self._send_pending = True
+        if self._worker_scope is not None:
+            self._worker_scope.cancel()
+
+    async def run(self):
+        if self._closed:
+            return
+        async with trio.open_nursery() as nursery:
+            nursery.start_soon(self._worker)
+        self._run_done.set()
+
+    async def make_stream(self, timeout=None):
+        if timeout is None:
+            context = NullContext(None)
+        else:
+            context = trio.move_on_after(timeout)
+        with context:
+            await self._handshake_complete.wait()
+            if self._done:
+                raise UnexpectedEOF
+            stream_id = self._connection.get_next_available_stream_id(False)
+            stream = TrioQuicStream(self, stream_id)
+            self._streams[stream_id] = stream
+            return stream
+        raise dns.exception.Timeout
+
+    async def close(self):
+        if not self._closed:
+            self._manager.closed(self._peer[0], self._peer[1])
+            self._closed = True
+            self._connection.close()
+            self._send_pending = True
+            if self._worker_scope is not None:
+                self._worker_scope.cancel()
+            await self._run_done.wait()
+
+
+class TrioQuicManager(AsyncQuicManager):
+    def __init__(
+        self,
+        nursery,
+        conf=None,
+        verify_mode=ssl.CERT_REQUIRED,
+        server_name=None,
+        h3=False,
+    ):
+        super().__init__(conf, verify_mode, TrioQuicConnection, server_name, h3)
+        self._nursery = nursery
+
+    def connect(
+        self, address, port=853, source=None, source_port=0, want_session_ticket=True
+    ):
+        (connection, start) = self._connect(
+            address, port, source, source_port, want_session_ticket
+        )
+        if start:
+            self._nursery.start_soon(connection.run)
+        return connection
+
+    async def __aenter__(self):
+        return self
+
+    async def __aexit__(self, exc_type, exc_val, exc_tb):
+        # Copy the iterator into a list as exiting things will mutate the connections
+        # table.
+        connections = list(self._connections.values())
+        for connection in connections:
+            await connection.close()
+        return False