write shit

BasaltTrainer/command_server.py

@@ -0,0 +1,113 @@
+import struct
+from enum import IntEnum, Enum, auto
+from dataclasses import dataclass
+from typing import Tuple, Optional
+from pipe_operator import PipeOperator
+
+PIPE_NAME: str = "ed0e3f1f-d214-4880-9562-640bce15e72e"
+
+class ProtocolCode(IntEnum):
+    HANDSHAKE_REQUEST = 0x61  # Trainer -> Presenter
+    HANDSHAKE_RESPONSE = 0x62  # Presenter -> Trainer
+    DATA_READY = 0x01  # Presenter -> Trainer
+    DATA_RECEIVED = 0x02  # Trainer -> Presenter
+    REQUEST_STOP = 0x71  # Presenter -> Trainer (request stop)
+    STOP = 0x71  # Trainer -> Presenter (confirm stop)
+
+class PixelKind(IntEnum):
+    GRAY_FLOAT32 = 0x01  # Grayscale represented by one float32
+    GRAY_U8 = 0x02  # Grayscale represented by one u8
+    RGB_FLOAT32 = 0x03  # RGB represented by three float32
+    RGB_U8 = 0x04  # RGB represented by three u8
+
+@dataclass
+class ImageProperties:
+    pixel_kind: PixelKind
+    width: int
+    height: int
+
+class ServerStatus(Enum):
+    Ready = auto()
+    Running = auto()
+    Stop = auto()
+
+
+CODE_PACKER: struct.Struct = struct.Struct("=B")
+HANDSHAKE_RESPONSE_PACKER: struct.Struct = struct.Struct("=BII")
+
+class CommandServer:
+    """
+    Command server implementation for the Trainer side according to the protocol.
+    """
+
+    pipe_operator: PipeOperator
+    statue: ServerStatus
+
+    def __init__(self):
+        self.pipe_operator = PipeOperator(PIPE_NAME)
+        self.handshaked = ServerStatus.Ready
+
+    def __del__(self):
+        """Cleanup resources when object is destroyed."""
+        self.pipe_operator.close()
+
+    def wait_handshake(self) -> ImageProperties:
+        """
+        Wait for handshake from Presenter, send request first and wait for response with data properties.
+        Returns a tuple of (pixel_kind, width, height) from the Presenter.
+        """
+        if self.statue != ServerStatus.Ready:
+            raise RuntimeError("unexpected server status")
+
+        # Send handshake request to Presenter (code 0x61)
+        self.pipe_operator.write(CODE_PACKER.pack(ProtocolCode.HANDSHAKE_REQUEST))
+
+        # Wait for handshake response from Presenter (code 0x62)
+        code_bytes = self.pipe_operator.read(CODE_PACKER.size)
+        (code, ) = CODE_PACKER.unpack(code_bytes)
+        if ProtocolCode(code) != ProtocolCode.HANDSHAKE_RESPONSE:
+            raise RuntimeError("expect handshake response code, but got another")
+
+        # Read data properties from Presenter (pixel_kind, width, height)
+        handshake_response_payload = self.pipe_operator.read(HANDSHAKE_RESPONSE_PACKER.size)
+        (raw_pixel_kind, width, height) = HANDSHAKE_RESPONSE_PACKER.unpack(handshake_response_payload)
+
+        # Set status and return
+        self.statue = ServerStatus.Running
+        return ImageProperties(PixelKind(raw_pixel_kind), width, height)
+
+    def tick(self, request_stop: bool) -> bool:
+        """
+        Tick function called every frame to wait for data ready from Presenter and send response.
+        Returns True if a stop code was received (meaning the process should stop), False otherwise.
+        """
+        if self.statue != ServerStatus.Running:
+            raise RuntimeError("unexpected server status")
+
+        # If there is stop requested, we post it first and return
+        if request_stop:
+            self.pipe_operator.write(CODE_PACKER.pack(ProtocolCode.STOP))
+            self.statue = ServerStatus.Stop
+            return True
+
+        # Wait for code from Presenter
+        code_bytes = self.pipe_operator.read(CODE_PACKER.size)
+        (code, ) = CODE_PACKER.unpack(code_bytes)
+        
+        # Analyse code
+        match ProtocolCode(code):
+            case ProtocolCode.DATA_READY:
+                # Receive data
+                print('Data received')
+                # Send data received symbol
+                self.pipe_operator.write(CODE_PACKER.pack(ProtocolCode.DATA_RECEIVED))
+            case ProtocolCode.REQUEST_STOP:
+                # Presenter requested stop.
+                # Agree with it, send code and return.
+                self.pipe_operator.write(CODE_PACKER.pack(ProtocolCode.STOP))
+                self.statue = ServerStatus.Stop
+                return True
+            case _:
+                raise RuntimeError("unexpected protocol code when running")
+
+        return False

BasaltTrainer/pipe_operator.py

@@ -51,6 +51,10 @@ class PipeOperator:
         else:
             # POSIX implementation
             self.pipe_name = f"/tmp/{name}"
+            # If there is an existing FIFO file, remove it
+            if os.path.exists(self.pipe_name):
+                os.unlink(self.pipe_name)
+            # Create pipe
             try:
                 os.mkfifo(self.pipe_name)
             except OSError as e:
@@ -155,49 +159,3 @@ class PipeOperator:
                 except OSError as e:
                     raise RuntimeError(f"Failed to write to named pipe: {e}")
 
-
-# class PipeServer:
-#     """
-#     A convenience class for creating a pipe server that can handle connections in a separate thread.
-#     """
-
-#     def __init__(self, name: str):
-#         self._name = name
-#         self._pipe_operator: Optional[PipeOperator] = None
-#         self._server_thread: Optional[threading.Thread] = None
-#         self._stop_event = threading.Event()
-
-#     def start_server(self, handler_func):
-#         """
-#         Start the pipe server in a separate thread.
-        
-#         :param handler_func: Function to handle the connected pipe (takes PipeOperator as parameter)
-#         """
-#         self._server_thread = threading.Thread(target=self._server_worker,
-#                                                args=(handler_func, ))
-#         self._server_thread.start()
-
-#     def _server_worker(self, handler_func):
-#         """Internal method to handle server operations."""
-#         try:
-#             # Create pipe server
-#             pipe_op = PipeOperator(self._name, is_server=True)
-#             self._pipe_operator = pipe_op
-
-#             # Call the handler function with the connected pipe
-#             handler_func(pipe_op)
-#         except Exception as e:
-#             print(f"Error in pipe server: {e}")
-#         finally:
-#             if self._pipe_operator:
-#                 self._pipe_operator.close()
-
-#     def stop_server(self):
-#         """Stop the pipe server."""
-#         self._stop_event.set()
-#         if self._server_thread:
-#             self._server_thread.join()
-
-#     def get_pipe(self) -> Optional[PipeOperator]:
-#         """Get the connected pipe operator (only valid after client connects)."""
-#         return self._pipe_operator