[router] remove code duplication (#12245)

sgl-router/src/routers/openai/conversations.rs

@@ -11,14 +11,14 @@ use chrono::Utc;
 use serde_json::{json, Value};
 use tracing::{debug, info, warn};
 
-use super::{responses::build_stored_response, utils::generate_id};
+use super::responses::build_stored_response;
 use crate::{
     data_connector::{
         Conversation, ConversationId, ConversationItemId, ConversationItemStorage,
         ConversationStorage, ListParams, NewConversation, NewConversationItem, ResponseId,
         ResponseStorage, SortOrder,
     },
-    protocols::responses::{ResponseInput, ResponsesRequest},
+    protocols::responses::{generate_id, ResponseInput, ResponsesRequest},
 };
 
 /// Maximum number of properties allowed in conversation metadata

sgl-router/src/routers/openai/mcp.rs

@@ -16,10 +16,12 @@ use serde_json::{json, to_value, Value};
 use tokio::sync::mpsc;
 use tracing::{debug, info, warn};
 
-use super::utils::{event_types, generate_id};
+use super::utils::event_types;
 use crate::{
     mcp,
-    protocols::responses::{ResponseInput, ResponseTool, ResponseToolType, ResponsesRequest},
+    protocols::responses::{
+        generate_id, ResponseInput, ResponseTool, ResponseToolType, ResponsesRequest,
+    },
     routers::header_utils::apply_request_headers,
 };
 

sgl-router/src/routers/openai/router.rs

@@ -52,8 +52,8 @@ use crate::{
         generate::GenerateRequest,
         rerank::RerankRequest,
         responses::{
-            ResponseContentPart, ResponseInput, ResponseInputOutputItem, ResponsesGetParams,
-            ResponsesRequest,
+            generate_id, ResponseContentPart, ResponseInput, ResponseInputOutputItem,
+            ResponsesGetParams, ResponsesRequest,
         },
     },
     routers::header_utils::apply_request_headers,
@@ -1034,10 +1034,7 @@ impl crate::routers::RouterTrait for OpenAIRouter {
                         if item.get("id").is_none() {
                             // Generate ID if not present using centralized utility
                             if let Some(obj) = item.as_object_mut() {
-                                obj.insert(
-                                    "id".to_string(),
-                                    json!(super::utils::generate_id("msg")),
-                                );
+                                obj.insert("id".to_string(), json!(generate_id("msg")));
                             }
                         }
                         item

sgl-router/src/routers/openai/utils.rs

@@ -220,16 +220,6 @@ pub async fn probe_endpoint_for_model(
     }
 }
 
-pub fn generate_id(prefix: &str) -> String {
-    use rand::RngCore;
-    let mut rng = rand::rng();
-    // Generate exactly 50 hex characters (25 bytes) for the part after the underscore
-    let mut bytes = [0u8; 25];
-    rng.fill_bytes(&mut bytes);
-    let hex_string: String = bytes.iter().map(|b| format!("{:02x}", b)).collect();
-    format!("{}_{}", prefix, hex_string)
-}
-
 // ============================================================================
 // Re-export FunctionCallInProgress from mcp module
 // ============================================================================