feat: add fraud detection validator

packages/node/meshnet_node/server.py

@@ -28,11 +28,20 @@ def _make_stub_activations(prompt: str) -> dict:
 
 
 class _StubHTTPServer(http.server.HTTPServer):
-    def __init__(self, addr, handler, shard_start: int, shard_end: int, is_last_shard: bool):
+    def __init__(
+        self,
+        addr,
+        handler,
+        shard_start: int,
+        shard_end: int,
+        is_last_shard: bool,
+        response_prefix: str,
+    ):
         super().__init__(addr, handler)
         self.shard_start = shard_start
         self.shard_end = shard_end
         self.is_last_shard = is_last_shard
+        self.response_prefix = response_prefix
         self.received_activations: bool = False
 
 
@@ -57,7 +66,7 @@ class _StubHandler(http.server.BaseHTTPRequestHandler):
             server.received_activations = True
             prompt = body["activations"].get("context", {}).get("prompt", "")
             if server.is_last_shard:
-                payload = json.dumps({"text": f"stub response to: {prompt}"}).encode()
+                payload = json.dumps({"text": f"{server.response_prefix} {prompt}"}).encode()
             else:
                 payload = json.dumps({"activations": _make_stub_activations(prompt)}).encode()
         else:
@@ -66,7 +75,7 @@ class _StubHandler(http.server.BaseHTTPRequestHandler):
             last_content = messages[-1]["content"] if messages else ""
             if server.is_last_shard:
                 # Single-node shortcut: no activation hop needed.
-                payload = json.dumps({"text": f"stub response to: {last_content}"}).encode()
+                payload = json.dumps({"text": f"{server.response_prefix} {last_content}"}).encode()
             else:
                 payload = json.dumps({"activations": _make_stub_activations(last_content)}).encode()
 
@@ -92,6 +101,7 @@ class StubNodeServer:
         shard_start: int = 0,
         shard_end: int = 31,
         is_last_shard: bool = True,
+        response_prefix: str = "stub response to:",
     ):
         self._host = host
         self._requested_port = port
@@ -100,6 +110,7 @@ class StubNodeServer:
         self._shard_start = shard_start
         self._shard_end = shard_end
         self._is_last_shard = is_last_shard
+        self._response_prefix = response_prefix
         self._server: _StubHTTPServer | None = None
         self._thread: threading.Thread | None = None
         self.port: int | None = None
@@ -119,6 +130,7 @@ class StubNodeServer:
             self._shard_start,
             self._shard_end,
             self._is_last_shard,
+            self._response_prefix,
         )
         self.port = self._server.server_address[1]
         self._thread = threading.Thread(target=self._server.serve_forever, daemon=True)