[Router] Add a rust-based router (#1790)

rust/src/lib.rs

@@ -0,0 +1,45 @@
+use pyo3::prelude::*;
+mod server;
+pub mod router;
+
+// Python binding
+#[pyclass]
+struct Router {
+    host: String,
+    port: u16,
+    worker_urls: Vec<String>,
+    policy: String
+}
+
+#[pymethods]
+impl Router {
+    #[new]
+    fn new(host: String, port: u16, worker_urls: Vec<String>, policy: String) -> Self {
+        Router {
+            host,
+            port,
+            worker_urls,
+            policy
+        }
+    }
+
+    fn start(&self) -> PyResult<()> {
+        let host = self.host.clone();
+        let port = self.port;
+        let worker_urls = self.worker_urls.clone();
+        let policy = self.policy.clone();
+
+        actix_web::rt::System::new().block_on(async move {
+            server::startup(host, port, worker_urls, policy).await.unwrap();
+        });
+
+        Ok(())
+    }
+}
+
+// python usage: `from sglang_router import Router`
+#[pymodule]
+fn sglang_router(m: &Bound<'_, PyModule>) -> PyResult<()> {
+    m.add_class::<Router>()?;
+    Ok(())
+}