[router] upgrade rand to latest version (#9017)

sgl-router/Cargo.toml

@@ -16,7 +16,7 @@ tower-http = { version = "0.6", features = ["trace", "compression-gzip", "cors",
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 bytes = "1.8.0"
-rand = "0.8.5"
+rand = "0.9.2"
 reqwest = { version = "0.12.8", features = ["stream", "blocking", "json"] }
 futures-util = "0.3"
 futures = "0.3"

sgl-router/src/middleware.rs

 use axum::{extract::Request, http::HeaderValue, response::Response};
+use rand::Rng;
 use std::sync::Arc;
 use std::time::Instant;
 use tower::{Layer, Service};
@@ -18,13 +19,12 @@ fn generate_request_id(path: &str) -> String {
     };
 
     // Generate a random string similar to OpenAI's format
+    let chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
+    let mut rng = rand::rng();
     let random_part: String = (0..24)
         .map(|_| {
-            let chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
-            chars
-                .chars()
-                .nth(rand::random::<usize>() % chars.len())
-                .unwrap()
+            let idx = rng.random_range(0..chars.len());
+            chars.chars().nth(idx).unwrap()
         })
         .collect();
 

sgl-router/src/policies/power_of_two.rs

@@ -55,13 +55,13 @@ impl LoadBalancingPolicy for PowerOfTwoPolicy {
         }
 
         // Select two random workers
-        let mut rng = rand::thread_rng();
-        let idx1 = rng.gen_range(0..healthy_indices.len());
-        let mut idx2 = rng.gen_range(0..healthy_indices.len());
+        let mut rng = rand::rng();
+        let idx1 = rng.random_range(0..healthy_indices.len());
+        let mut idx2 = rng.random_range(0..healthy_indices.len());
 
         // Ensure we pick two different workers
         while idx2 == idx1 {
-            idx2 = rng.gen_range(0..healthy_indices.len());
+            idx2 = rng.random_range(0..healthy_indices.len());
         }
 
         let worker_idx1 = healthy_indices[idx1];

sgl-router/src/policies/random.rs

@@ -29,8 +29,8 @@ impl LoadBalancingPolicy for RandomPolicy {
             return None;
         }
 
-        let mut rng = rand::thread_rng();
-        let random_idx = rng.gen_range(0..healthy_indices.len());
+        let mut rng = rand::rng();
+        let random_idx = rng.random_range(0..healthy_indices.len());
         let worker = workers[healthy_indices[random_idx]].url();
 
         RouterMetrics::record_processed_request(worker);

sgl-router/src/tree.rs

@@ -661,9 +661,9 @@ impl Tree {
 //  Unit tests
 #[cfg(test)]
 mod tests {
-    use rand::distributions::Alphanumeric;
-    use rand::distributions::DistString;
-    use rand::thread_rng;
+    use rand::distr::Alphanumeric;
+    use rand::distr::SampleString;
+    use rand::rng as thread_rng;
     use rand::Rng;
     use std::thread;
     use std::time::Instant;
@@ -1256,27 +1256,27 @@ mod tests {
         for thread_id in 0..4 {
             let tree = Arc::clone(&tree);
             let handle = thread::spawn(move || {
-                let mut rng = rand::thread_rng();
+                let mut rng = rand::rng();
                 let tenant = format!("tenant{}", thread_id + 1);
                 let prefix = format!("prefix{}", thread_id);
 
                 while start_time.elapsed() < test_duration {
                     // Random decision: match or insert (70% match, 30% insert)
-                    if rng.gen_bool(0.7) {
+                    if rng.random_bool(0.7) {
                         // Perform match operation
-                        let random_len = rng.gen_range(3..10);
+                        let random_len = rng.random_range(3..10);
                         let search_str = format!("{}{}", prefix, random_string(random_len));
                         let (_matched, _) = tree.prefix_match(&search_str);
                     } else {
                         // Perform insert operation
-                        let random_len = rng.gen_range(5..15);
+                        let random_len = rng.random_range(5..15);
                         let insert_str = format!("{}{}", prefix, random_string(random_len));
                         tree.insert(&insert_str, &tenant);
                         // println!("Thread {} inserted: {}", thread_id, insert_str);
                     }
 
                     // Small random sleep to vary timing
-                    thread::sleep(Duration::from_millis(rng.gen_range(10..100)));
+                    thread::sleep(Duration::from_millis(rng.random_range(10..100)));
                 }
             });
             handles.push(handle);