Evaluation: depth 15 statt 10s, HTTP/1.1 Chunked-Streaming, Abbruch-Support

server.py

@@ -13,6 +13,7 @@ import re
 import sys
 import threading
 import socket
+import queue
 
 PORT = int(os.environ.get("PORT", 8111))
 BASE_DIR = os.path.dirname(os.path.abspath(__file__))
@@ -34,6 +35,11 @@ class StockfishEngine:
     def __init__(self, path):
         self.path = path
         self.proc = None
+        self._output_queue = queue.Queue()
+        self._reader_thread = None
+        self._reader_alive = threading.Event()
+        self._cmd_lock = threading.Lock()
+        self._searching = False
 
     def start(self):
         if self.proc:
@@ -51,25 +57,78 @@ class StockfishEngine:
             bufsize=1,
             creationflags=flags,
         )
+
+        self._reader_alive.set()
+        self._reader_thread = threading.Thread(target=self._read_output, daemon=True)
+        self._reader_thread.start()
+
         self._send("uci")
         self._read_until("uciok")
         self._send("isready")
         self._read_until("readyok")
+
         print(f"[STOCKFISH] Engine gestartet: {self.path}")
 
+    def _read_output(self):
+        while self._reader_alive.is_set():
+            try:
+                line = self.proc.stdout.readline()
+            except Exception:
+                break
+            if not line:
+                break
+            self._output_queue.put(line)
+
     def _send(self, cmd):
-        self.proc.stdin.write(cmd + "\n")
-        self.proc.stdin.flush()
+        with self._cmd_lock:
+            self.proc.stdin.write(cmd + "\n")
+            self.proc.stdin.flush()
 
     def _read_until(self, marker):
         while True:
-            line = self.proc.stdout.readline().strip()
-            if line == marker:
+            try:
+                line = self._output_queue.get(timeout=5.0)
+            except queue.Empty:
+                return
+            if line.strip() == marker:
+                return
+
+    def _drain_queue(self):
+        """Leert die Queue von allen pending Zeilen."""
+        drained = 0
+        while True:
+            try:
+                self._output_queue.get_nowait()
+                drained += 1
+            except queue.Empty:
+                break
+        if drained > 0:
+            print(f"[STOCKFISH] {drained} alte Zeilen verworfen")
+
+    def _stop_and_wait(self):
+        """Stoppt laufende Suche und wartet auf bestmove."""
+        if not self._searching:
+            return
+        self._send("stop")
+        while True:
+            try:
+                line = self._output_queue.get(timeout=3.0).strip()
+            except queue.Empty:
+                # Stockfish antwortet nicht auf stop (z.B. weil Suche schon beendet)
+                self._searching = False
+                return
+            if line.startswith("bestmove"):
+                self._searching = False
                 return
 
     def evaluate(self, fen):
+        # Alte Suche abbrechen und Queue leeren
+        self._stop_and_wait()
+        self._drain_queue()
+
         self._send(f"position fen {fen}")
-        self._send(f"go movetime 10000")
+        self._send(f"go depth {STOCKFISH_DEPTH}")
+        self._searching = True
 
         score_cp = None
         score_mate = None
@@ -78,7 +137,11 @@ class StockfishEngine:
         last_depth = 0
 
         while True:
-            line = self.proc.stdout.readline().strip()
+            try:
+                line = self._output_queue.get(timeout=1.0).strip()
+            except queue.Empty:
+                continue
+
             if not line:
                 continue
 
@@ -109,6 +172,7 @@ class StockfishEngine:
             if line.startswith("bestmove"):
                 parts = line.split()
                 bestmove = parts[1] if len(parts) > 1 else None
+                self._searching = False
                 break
 
         yield {
@@ -119,6 +183,7 @@ class StockfishEngine:
         }
 
     def stop(self):
+        self._reader_alive.clear()
         if self.proc:
             self.proc.terminate()
             self.proc = None
@@ -128,6 +193,7 @@ _engine = StockfishEngine(STOCKFISH_PATH)
 
 
 class Handler(http.server.BaseHTTPRequestHandler):
+    protocol_version = "HTTP/1.1"
 
     def do_GET(self):
         if self.path == "/":
@@ -181,7 +247,7 @@ class Handler(http.server.BaseHTTPRequestHandler):
             self.send_header("Content-Type", "application/x-ndjson; charset=utf-8")
             self.send_header("Access-Control-Allow-Origin", "*")
             self.send_header("Cache-Control", "no-cache")
-            self.send_header("Connection", "close")
+            self.send_header("Transfer-Encoding", "chunked")
             self.end_headers()
             self.wfile.flush()
 
@@ -191,28 +257,40 @@ class Handler(http.server.BaseHTTPRequestHandler):
             except Exception:
                 pass
 
-            self.close_connection = True
+            def _write_chunk(chunk_data):
+                size = len(chunk_data)
+                self.wfile.write(f"{size:x}\r\n".encode())
+                self.wfile.write(chunk_data)
+                self.wfile.write(b"\r\n")
+                self.wfile.flush()
+
             try:
                 with _stockfish_lock:
                     try:
                         _engine.start()
                     except FileNotFoundError:
-                        self.wfile.write(
-                            json.dumps({"error": "Stockfish nicht gefunden"}).encode("utf-8") + b"\n"
+                        _write_chunk(
+                            json.dumps({"error": "Stockfish nicht gefunden"}).encode("utf-8")
                         )
-                        self.wfile.flush()
                         return
 
                     for result in _engine.evaluate(fen):
-                        data = json.dumps(result).encode("utf-8") + b"\n"
-                        self.wfile.write(data)
-                        self.wfile.flush()
+                        try:
+                            data = json.dumps(result).encode("utf-8") + b"\n"
+                            _write_chunk(data)
+                        except (BrokenPipeError, ConnectionResetError, ConnectionAbortedError, OSError):
+                            # Client hat Verbindung getrennt (neuer Zug angeklickt / Pfeiltasten)
+                            break
+                # Abschluss-Chunk
+                _write_chunk(b"")
             except Exception as e:
                 print(f"[STOCKFISH] Fehler: {e}")
-                self.wfile.write(
-                    json.dumps({"error": str(e)}).encode("utf-8") + b"\n"
-                )
-                self.wfile.flush()
+                try:
+                    _write_chunk(
+                        json.dumps({"error": str(e)}).encode("utf-8")
+                    )
+                except Exception:
+                    pass
         else:
             self._send_json({"error": "Not found"}, 404)