chore: vendor sglang v0.5.10 snapshot

third_party/sglang/sgl-model-gateway/examples/wasm/wasm-guest-logging/src/lib.rs

@@ -0,0 +1,88 @@
+//! WASM Guest Logging Example for sgl-model-gateway
+//!
+//! This example demonstrates logging and tracing middleware
+//! for sgl-model-gateway using the WebAssembly Component Model.
+//!
+//! Features:
+//! - Request tracking and tracing headers
+//! - Response status code conversion
+
+wit_bindgen::generate!({
+    path: "../../../src/wasm/interface",
+    world: "sgl-model-gateway",
+});
+
+use exports::sgl::model_gateway::{
+    middleware_on_request::Guest as OnRequestGuest,
+    middleware_on_response::Guest as OnResponseGuest,
+};
+use sgl::model_gateway::middleware_types::{Action, Header, ModifyAction, Request, Response};
+
+/// Main middleware implementation
+struct Middleware;
+
+// Helper function to create header
+fn create_header(name: &str, value: &str) -> Header {
+    Header {
+        name: name.to_string(),
+        value: value.to_string(),
+    }
+}
+
+// Implement on-request interface
+impl OnRequestGuest for Middleware {
+    fn on_request(req: Request) -> Action {
+        let mut modify_action = ModifyAction {
+            status: None,
+            headers_set: vec![],
+            headers_add: vec![],
+            headers_remove: vec![],
+            body_replace: None,
+        };
+
+        // Request Logging and Tracing
+        // Add tracing headers with request ID
+        modify_action
+            .headers_add
+            .push(create_header("x-request-id", &req.request_id));
+        modify_action
+            .headers_add
+            .push(create_header("x-wasm-processed", "true"));
+        modify_action.headers_add.push(create_header(
+            "x-processed-at",
+            &req.now_epoch_ms.to_string(),
+        ));
+
+        // Add custom header for API requests
+        if req.path.starts_with("/api") || req.path.starts_with("/v1") {
+            modify_action
+                .headers_add
+                .push(create_header("x-api-route", "true"));
+        }
+
+        Action::Modify(modify_action)
+    }
+}
+
+// Implement on-response interface
+impl OnResponseGuest for Middleware {
+    fn on_response(resp: Response) -> Action {
+        // Status code conversion: Convert 500 to 503 for better client handling
+        if resp.status == 500 {
+            let modify_action = ModifyAction {
+                status: Some(503),
+                headers_set: vec![],
+                headers_add: vec![],
+                headers_remove: vec![],
+                body_replace: None,
+            };
+            Action::Modify(modify_action)
+        } else {
+            // No modification needed
+            Action::Continue
+        }
+    }
+}
+
+// Export the component
+export!(Middleware);