Implemented VNC ContinuousUpdates

kvmd/apps/vnc/rfb/__init__.py

@@ -159,6 +159,9 @@ class RfbClient(RfbClientStream):  # pylint: disable=too-many-instance-attribute
     async def _on_fb_update_request(self) -> None:
         raise NotImplementedError
 
+    async def _on_enable_cont_updates(self, enabled: bool) -> None:
+        raise NotImplementedError
+
     # =====
 
     async def _send_fb_jpeg(self, data: bytes) -> None:
@@ -398,6 +401,7 @@ class RfbClient(RfbClientStream):  # pylint: disable=too-many-instance-attribute
             4: self.__handle_key_event,
             5: self.__handle_pointer_event,
             6: self.__handle_client_cut_text,
+            150: self.__handle_enable_cont_updates,
             255: self.__handle_qemu_event,
         }
         while True:
@@ -429,6 +433,9 @@ class RfbClient(RfbClientStream):  # pylint: disable=too-many-instance-attribute
             logger.info("%s [main]: ... %s", self._remote, item)
         self.__check_encodings()
 
+        if self._encodings.has_cont_updates:
+            await self._write_struct("allow ContUpdates", "B", 150)
+
         if self._encodings.has_ext_keys:  # Preferred method
             await self._write_fb_update("ExtKeys FBUR", 0, 0, RfbEncodings.EXT_KEYS, drain=True)
         await self._on_set_encodings()
@@ -473,6 +480,12 @@ class RfbClient(RfbClientStream):  # pylint: disable=too-many-instance-attribute
         text = await self._read_text("cut text data", length)
         await self._on_cut_event(text)
 
+    async def __handle_enable_cont_updates(self) -> None:
+        enabled = bool((await self._read_struct("enabled ContUpdates", "B HH HH"))[0])
+        await self._on_enable_cont_updates(enabled)
+        if not enabled:
+            await self._write_struct("disabled ContUpdates", "B", 150)
+
     async def __handle_qemu_event(self) -> None:
         (sub_type, state, code) = await self._read_struct("QEMU event (key?)", "B H xxxx L")
         if sub_type != 0:

kvmd/apps/vnc/rfb/encodings.py

@@ -31,6 +31,7 @@ class RfbEncodings:
     RENAME = -307  # DesktopName Pseudo-encoding
     LEDS_STATE = -261  # QEMU LED State Pseudo-encoding
     EXT_KEYS = -258  # QEMU Extended Key Events Pseudo-encoding
+    CONT_UPDATES = -313  # ContinuousUpdates Pseudo-encoding
 
     TIGHT = 7
     TIGHT_JPEG_QUALITIES = dict(zip(  # JPEG Quality Level Pseudo-encoding
@@ -53,6 +54,7 @@ class RfbClientEncodings:  # pylint: disable=too-many-instance-attributes
     has_rename: bool =		    dataclasses.field(default=False, metadata=_make_meta(RfbEncodings.RENAME))  # noqa: E224
     has_leds_state: bool =	    dataclasses.field(default=False, metadata=_make_meta(RfbEncodings.LEDS_STATE))  # noqa: E224
     has_ext_keys: bool =	    dataclasses.field(default=False, metadata=_make_meta(RfbEncodings.EXT_KEYS))  # noqa: E224
+    has_cont_updates: bool =	dataclasses.field(default=False, metadata=_make_meta(RfbEncodings.CONT_UPDATES))  # noqa: E224
 
     has_tight: bool =		    dataclasses.field(default=False, metadata=_make_meta(RfbEncodings.TIGHT))  # noqa: E224
     tight_jpeg_quality: int =	dataclasses.field(default=0,     metadata=_make_meta(frozenset(RfbEncodings.TIGHT_JPEG_QUALITIES)))  # noqa: E224

kvmd/apps/vnc/server.py

@@ -122,6 +122,8 @@ class _Client(RfbClient):  # pylint: disable=too-many-instance-attributes
 
         self.__fb_notifier = aiotools.AioNotifier()
         self.__fb_queue: "asyncio.Queue[dict]" = asyncio.Queue()
+        self.__fb_cont_updates = False
+        self.__fb_key_required = False
 
         # Эти состояния шарить не обязательно - бекенд исключает дублирующиеся события.
         # Все это нужно только чтобы не посылать лишние жсоны в сокет KVMD
@@ -198,7 +200,9 @@ class _Client(RfbClient):  # pylint: disable=too-many-instance-attributes
         while True:
             try:
                 streaming = False
-                async for frame in streamer.read_stream():
+                async with streamer.reading() as read_frame:
+                    while True:
+                        frame = await read_frame(self.__fb_key_required)
                         if not streaming:
                             logger.info("%s [streamer]: Streaming ...", self._remote)
                             streaming = True
@@ -284,6 +288,8 @@ class _Client(RfbClient):  # pylint: disable=too-many-instance-attributes
                             f" -> {last['width']}x{last['height']}\nPlease reconnect"
                         )
                         await self._send_fb_jpeg((await self.__make_text_frame(msg))["data"])
+                        if self.__fb_cont_updates:
+                            self.__fb_notifier.notify()
                         continue
                     await self._send_resize(last["width"], last["height"])
 
@@ -294,12 +300,18 @@ class _Client(RfbClient):  # pylint: disable=too-many-instance-attributes
 
                 if last["format"] == StreamFormats.JPEG:
                     await self._send_fb_jpeg(last["data"])
+                    if self.__fb_cont_updates:
+                        self.__fb_notifier.notify()
                 elif last["format"] == StreamFormats.H264:
                     if not self._encodings.has_h264:
                         raise RfbError("The client doesn't want to accept H264 anymore")
                     if has_h264_key:
+                        self.__fb_key_required = False
                         await self._send_fb_h264(last["data"])
+                        if self.__fb_cont_updates:
+                            self.__fb_notifier.notify()
                     else:
+                        self.__fb_key_required = True
                         self.__fb_notifier.notify()
                 else:
                     raise RuntimeError(f"Unknown format: {last['format']}")
@@ -413,6 +425,13 @@ class _Client(RfbClient):  # pylint: disable=too-many-instance-attributes
         await self.__kvmd_session.streamer.set_params(quality, self.__desired_fps)
 
     async def _on_fb_update_request(self) -> None:
+        if not self.__fb_cont_updates:
+            self.__fb_notifier.notify()
+
+    async def _on_enable_cont_updates(self, enabled: bool) -> None:
+        get_logger(0).info("%s [main]: Applying ContUpdates=%s ...", self._remote, enabled)
+        self.__fb_cont_updates = enabled
+        if enabled:
             self.__fb_notifier.notify()
 
 

kvmd/clients/streamer.py

@@ -20,16 +20,16 @@
 # ========================================================================== #
 
 
+import contextlib
 import types
 
+from typing import Callable
+from typing import Awaitable
+from typing import Generator
 from typing import AsyncGenerator
 
 import aiohttp
-
-try:
 import ustreamer
-except ImportError:
-    ustreamer = None
 
 from .. import tools
 from .. import aiotools
@@ -60,12 +60,24 @@ class BaseStreamerClient:
     def get_format(self) -> int:
         raise NotImplementedError()
 
-    async def read_stream(self) -> AsyncGenerator[dict, None]:
+    @contextlib.asynccontextmanager
+    async def reading(self) -> AsyncGenerator[Callable[[bool], Awaitable[dict]], None]:
         if self is not None:  # XXX: Vulture and pylint hack
             raise NotImplementedError()
         yield
 
 
+# =====
+@contextlib.contextmanager
+def _http_handle_errors() -> Generator[None, None, None]:
+    try:
+        yield
+    except Exception as err:  # Тут бывают и ассерты, и KeyError, и прочая херня
+        if isinstance(err, StreamerTempError):
+            raise
+        raise StreamerTempError(tools.efmt(err))
+
+
 class HttpStreamerClient(BaseStreamerClient):
     def __init__(
         self,
@@ -83,8 +95,9 @@ class HttpStreamerClient(BaseStreamerClient):
     def get_format(self) -> int:
         return StreamFormats.JPEG
 
-    async def read_stream(self) -> AsyncGenerator[dict, None]:
+    @contextlib.asynccontextmanager
-        try:
+    async def reading(self) -> AsyncGenerator[Callable[[bool], Awaitable[dict]], None]:
+        with _http_handle_errors():
             async with self.__make_http_session() as session:
                 async with session.get(
                     url=self.__make_url("stream"),
@@ -94,27 +107,26 @@ class HttpStreamerClient(BaseStreamerClient):
                     reader = aiohttp.MultipartReader.from_response(response)
                     self.__patch_stream_reader(reader.resp.content)
 
-                    while True:
+                    async def read_frame(key_required: bool) -> dict:
+                        _ = key_required
+                        with _http_handle_errors():
                             frame = await reader.next()  # pylint: disable=not-callable
                             if not isinstance(frame, aiohttp.BodyPartReader):
                                 raise StreamerTempError("Expected body part")
 
                             data = bytes(await frame.read())
                             if not data:
-                            break
+                                raise StreamerTempError("Reached EOF")
 
-                        yield {
+                            return {
                                 "online": (frame.headers["X-UStreamer-Online"] == "true"),
                                 "width": int(frame.headers["X-UStreamer-Width"]),
                                 "height": int(frame.headers["X-UStreamer-Height"]),
                                 "data": data,
                                 "format": StreamFormats.JPEG,
                             }
-        except Exception as err:  # Тут бывают и ассерты, и KeyError, и прочая херня
+
-            if isinstance(err, StreamerTempError):
+                    yield read_frame
-                raise
-            raise StreamerTempError(tools.efmt(err))
-        raise StreamerTempError("Reached EOF")
 
     def __make_http_session(self) -> aiohttp.ClientSession:
         kwargs: dict = {
@@ -148,6 +160,19 @@ class HttpStreamerClient(BaseStreamerClient):
         return f"HttpStreamerClient({self.__name})"
 
 
+# =====
+@contextlib.contextmanager
+def _memsink_handle_errors() -> Generator[None, None, None]:
+    try:
+        yield
+    except StreamerPermError:
+        raise
+    except FileNotFoundError as err:
+        raise StreamerTempError(tools.efmt(err))
+    except Exception as err:
+        raise StreamerPermError(tools.efmt(err))
+
+
 class MemsinkStreamerClient(BaseStreamerClient):
     def __init__(
         self,
@@ -171,25 +196,19 @@ class MemsinkStreamerClient(BaseStreamerClient):
     def get_format(self) -> int:
         return self.__fmt
 
-    async def read_stream(self) -> AsyncGenerator[dict, None]:
+    @contextlib.asynccontextmanager
-        if ustreamer is None:
+    async def reading(self) -> AsyncGenerator[Callable[[bool], Awaitable[dict]], None]:
-            raise StreamerPermError("Missing ustreamer library")
+        with _memsink_handle_errors():
-        try:
             with ustreamer.Memsink(**self.__kwargs) as sink:
-                key_required = (self.__fmt == StreamFormats.H264)
+                async def read_frame(key_required: bool) -> dict:
+                    key_required = (key_required and self.__fmt == StreamFormats.H264)
+                    with _memsink_handle_errors():
                         while True:
                             frame = await aiotools.run_async(sink.wait_frame, key_required)
                             if frame is not None:
                                 self.__check_format(frame["format"])
-                        if frame["key"]:
+                                return frame
-                            key_required = False
+                yield read_frame
-                        yield frame
-        except StreamerPermError:
-            raise
-        except FileNotFoundError as err:
-            raise StreamerTempError(tools.efmt(err))
-        except Exception as err:
-            raise StreamerPermError(tools.efmt(err))
 
     def __check_format(self, fmt: int) -> None:
         if fmt == StreamFormats._MJPEG:  # pylint: disable=protected-access