tests: add websockets->wsproto translation layer

poetry.lock

@@ -424,7 +424,7 @@ cffi = ["cffi (>=1.11)"]
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.9"
-content-hash = "56d99717b6f3a32560d33ee9efdb77c7cf59f2447f1ff626c8dabb1261dc30c7"
+content-hash = "135c208a1dd82e1f358357e6ce26802d134e57f6fb8966d634c8b200c9730d96"
 
 [metadata.files]
 aiofiles = [

pyproject.toml

@@ -19,6 +19,7 @@ pillow = "^8.3.2"
 aiohttp = "^3.7.4"
 zstandard = "^0.15.2"
 winter = {git = "https://gitlab.com/elixire/winter"}
+wsproto = "^1.0.0"
 
 
 

tests/test_websocket.py

@@ -19,10 +19,23 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import json
 import zlib
+import asyncio
+import urllib.parse
+import collections
 from typing import Optional
 
 import pytest
 import websockets
+from logbook import Logger
+from wsproto import WSConnection, ConnectionType
+from wsproto.connection import ConnectionState
+from wsproto.events import (
+    Request,
+    Message,
+    AcceptConnection,
+    CloseConnection,
+    Ping,
+)
 
 from litecord.gateway.opcodes import OP
 from litecord.gateway.websocket import decode_etf
@@ -31,6 +44,109 @@ from litecord.gateway.websocket import decode_etf
 ZLIB_SUFFIX = b"\x00\x00\xff\xff"
 
 
+log = Logger("test_websocket")
+
+RcvdWrapper = collections.namedtuple("RcvdWrapper", "code reason")
+
+
+class AsyncWebsocket:
+    """websockets-compatible websocket object"""
+
+    def __init__(self, url):
+        self.url = url
+        self.ws = WSConnection(ConnectionType.CLIENT)
+        self.reader, self.writer = None, None
+
+    async def send(self, data):
+        assert self.writer is not None
+
+        # wrap all strings in Message
+        if isinstance(data, str):
+            data = Message(data=data)
+
+        log.debug("sending {} event", type(data))
+
+        self.writer.write(self.ws.send(data))
+        await self.writer.drain()
+
+    async def recv(self, *, expect=Message, process_event: bool = True):
+
+        # this loop is only done so we reply to pings while also being
+        # able to receive any other event in the middle.
+        #
+        # CloseConnection does not lead us to reading other events, so
+        # that's why it's left out.
+
+        while True:
+            # if there's already an unprocessed event we can try getting
+            # it from wsproto first
+            event = None
+            for event in self.ws.events():
+                break
+
+            if event is None:
+                data = await self.reader.read(4096)
+                assert data  # We expect the WebSocket to be closed correctly
+                self.ws.receive_data(data)
+                continue
+
+            # if we get a ping, reply with pong immediately
+            # and fetch the next event
+            if isinstance(event, Ping):
+                await self.send(event.response())
+                continue
+
+            break
+
+        if isinstance(event, CloseConnection):
+            assert self.ws.state is ConnectionState.REMOTE_CLOSING
+            await self.send(event.response())
+            if process_event:
+                raise websockets.ConnectionClosed(
+                    RcvdWrapper(event.code, event.reason), None
+                )
+
+        if expect is not None and not isinstance(event, expect):
+            raise AssertionError(
+                f"Expected {expect!r} websocket event, got {type(event)!r}"
+            )
+
+        # this keeps compatibility with code written for aaugustin/websockets
+        if expect is Message and process_event:
+            return event.data
+
+        return event
+
+    async def close(self, close_code: int, close_reason: str):
+        log.info("closing connection")
+        event = CloseConnection(code=close_code, reason=close_reason)
+        await self.send(event)
+        self.writer.close()
+        await self.writer.wait_closed()
+        self.ws.receive_data(None)
+
+    async def connect(self):
+        parsed = urllib.parse.urlparse(self.url)
+        if parsed.scheme == "wss":
+            port = 443
+        elif parsed.scheme == "ws":
+            port = 80
+        else:
+            raise AssertionError("Invalid url scheme")
+
+        host, *rest = parsed.netloc.split(":")
+        if rest:
+            port = rest[0]
+
+        log.info("connecting to {!r} {}", host, port)
+        self.reader, self.writer = await asyncio.open_connection(host, port)
+
+        path = parsed.path or "/"
+        target = f"{path}?{parsed.query}" if parsed.query else path
+        await self.send(Request(host=parsed.netloc, target=target))
+        await self.recv(expect=AcceptConnection)
+
+
 async def _recv(conn, *, zlib_stream: bool):
     if zlib_stream:
         try:
@@ -43,11 +159,16 @@ async def _recv(conn, *, zlib_stream: bool):
         zlib_buffer = bytearray()
         while True:
             # keep receiving frames until we find the zlib prefix inside
-            msg = await conn.recv()
-            zlib_buffer.extend(msg)
-            if len(msg) < 4 or msg[-4:] != ZLIB_SUFFIX:
+            # we set process_event to false so that we get the entire event
+            # instead of only data
+            event = await conn.recv(process_event=False)
+            zlib_buffer.extend(event.data)
+            if not event.message_finished:
                 continue
 
+            if len(zlib_buffer) < 4 or zlib_buffer[-4:] != ZLIB_SUFFIX:
+                raise RuntimeError("Finished compressed message without ZLIB suffix")
+
             # NOTE: the message is utf-8 encoded.
             msg = conn._zlib_context.decompress(zlib_buffer)
             return msg
@@ -119,7 +240,10 @@ async def gw_start(
         gw_url = f"{gw_url}?v={version}&encoding=json"
 
     compress = f"&compress={compress}" if compress else ""
-    return await websockets.connect(f"{gw_url}{compress}")
+
+    ws = AsyncWebsocket(f"{gw_url}{compress}")
+    await ws.connect()
+    return ws
 
 
 @pytest.mark.asyncio
@@ -174,8 +298,6 @@ async def test_broken_identify(test_cli_user):
         raise AssertionError("Received a JSON message but expected close")
     except websockets.ConnectionClosed as exc:
         assert exc.code == 4002
-    finally:
-        await _close(conn)
 
 
 @pytest.mark.asyncio