setup router python binding ci (#1999)

rust/py_src/router.py

@@ -0,0 +1,48 @@
+from typing import List, Optional
+
+from sglang_router_rs import PolicyType
+from sglang_router_rs import Router as _Router
+
+
+class Router:
+    """
+    A high-performance router for distributing requests across worker nodes.
+
+    Args:
+        worker_urls: List of URLs for worker nodes that will handle requests
+        policy: Load balancing policy to use. Options:
+            - PolicyType.Random: Randomly select workers
+            - PolicyType.RoundRobin: Distribute requests in round-robin fashion
+            - PolicyType.ApproxTree: Tree-based routing using tokenizer similarity
+        host: Host address to bind the router server
+        port: Port number to bind the router server
+        tokenizer_path: Path to tokenizer model file (required for ApproxTree policy)
+        cache_threshold: Caching threshold value between 0-1
+
+    """
+
+    def __init__(
+        self,
+        worker_urls: List[str],
+        policy: PolicyType = PolicyType.RoundRobin,
+        host: str = "127.0.0.1",
+        port: int = 3001,
+        tokenizer_path: Optional[str] = None,
+        cache_threshold: float = 0.50,
+    ):
+
+        self._router = _Router(
+            worker_urls=worker_urls,
+            policy=policy,
+            host=host,
+            port=port,
+            tokenizer_path=tokenizer_path,
+            cache_threshold=cache_threshold,
+        )
+
+    def start(self) -> None:
+        """Start the router server.
+
+        This method blocks until the server is shut down.
+        """
+        self._router.start()