add openjtalk worker pkg

text/pyopenjtalk_worker/worker_common.py

@@ -0,0 +1,44 @@
+from typing import Any, Optional, Final
+from enum import IntEnum, auto
+import socket
+import json
+
+WOKER_PORT: Final[int] = 7861
+HEADER_SIZE: Final[int] = 4
+
+
+class RequestType(IntEnum):
+    STATUS = auto()
+    QUIT_SERVER = auto()
+    PYOPENJTALK = auto()
+
+
+class ConnectionClosedException(Exception):
+    pass
+
+
+# socket communication
+
+
+def send_data(sock: socket.socket, data: dict[str, Any]):
+    json_data = json.dumps(data).encode()
+    header = len(json_data).to_bytes(HEADER_SIZE, byteorder="big")
+    sock.sendall(header + json_data)
+
+
+def _receive_until(sock: socket.socket, size: int):
+    data = b""
+    while len(data) < size:
+        part = sock.recv(size - len(data))
+        if part == b"":
+            raise ConnectionClosedException("接続が閉じられました")
+        data += part
+
+    return data
+
+
+def receive_data(sock: socket.socket) -> dict[str, Any]:
+    header = _receive_until(sock, HEADER_SIZE)
+    data_length = int.from_bytes(header, byteorder="big")
+    body = _receive_until(sock, data_length)
+    return json.loads(body.decode())