add support for openwebui (#487)

crates/brightstaff/src/handlers/chat_completions.rs

@@ -3,7 +3,6 @@ use std::sync::Arc;
 use bytes::Bytes;
 use common::api::open_ai::ChatCompletionsRequest;
 use common::consts::ARCH_PROVIDER_HINT_HEADER;
-use common::utils::shorten_string;
 use http_body_util::combinators::BoxBody;
 use http_body_util::{BodyExt, Full, StreamBody};
 use hyper::body::Frame;
@@ -39,7 +38,7 @@ pub async fn chat_completions(
                 let v: Value = serde_json::from_slice(&chat_request_bytes).unwrap();
                 let err_msg = format!("Failed to parse request body: {}", err);
                 warn!("{}", err_msg);
-                warn!("request body: {}", v.to_string());
+                warn!("arch-router request body: {}", v.to_string());
                 let mut bad_request = Response::new(full(err_msg));
                 *bad_request.status_mut() = StatusCode::BAD_REQUEST;
                 return Ok(bad_request);
@@ -47,8 +46,8 @@ pub async fn chat_completions(
         };
 
     debug!(
-        "request body: {}",
-        shorten_string(&serde_json::to_string(&chat_completion_request).unwrap())
+        "arch-router request body: {}",
+        &serde_json::to_string(&chat_completion_request).unwrap()
     );
 
     let trace_parent = request_headers
@@ -56,7 +55,7 @@ pub async fn chat_completions(
         .find(|(ty, _)| ty.as_str() == "traceparent")
         .map(|(_, value)| value.to_str().unwrap_or_default().to_string());
 
-    let selected_llm = match router_service
+    let mut selected_llm = match router_service
         .determine_route(&chat_completion_request.messages, trace_parent.clone())
         .await
     {
@@ -69,6 +68,11 @@ pub async fn chat_completions(
         }
     };
 
+    if selected_llm.is_none() {
+        debug!("No LLM model selected, using default from request");
+        selected_llm = Some(chat_completion_request.model.clone());
+    }
+
     info!(
         "sending request to llm provider: {} with llm model: {:?}",
         llm_provider_endpoint, selected_llm

crates/brightstaff/src/handlers/mod.rs

@@ -1 +1,2 @@
 pub mod chat_completions;
+pub mod models;

crates/brightstaff/src/handlers/models.rs

@@ -0,0 +1,40 @@
+use bytes::Bytes;
+use common::api::open_ai::Models;
+use common::configuration::LlmProvider;
+use http_body_util::{combinators::BoxBody, BodyExt, Full};
+use hyper::{Response, StatusCode};
+use serde_json;
+use std::sync::Arc;
+
+pub async fn list_models(
+    llm_providers: Arc<Vec<LlmProvider>>,
+) -> Response<BoxBody<Bytes, hyper::Error>> {
+    let prov = llm_providers.clone();
+    let providers = (*prov).clone();
+    let openai_models = Models::from(providers);
+
+    match serde_json::to_string(&openai_models) {
+        Ok(json) => {
+            let body = Full::new(Bytes::from(json))
+                .map_err(|never| match never {})
+                .boxed();
+            Response::builder()
+                .status(StatusCode::OK)
+                .header("Content-Type", "application/json")
+                .body(body)
+                .unwrap()
+        }
+        Err(_) => {
+            let body = Full::new(Bytes::from_static(
+                b"{\"error\":\"Failed to serialize models\"}",
+            ))
+            .map_err(|never| match never {})
+            .boxed();
+            Response::builder()
+                .status(StatusCode::INTERNAL_SERVER_ERROR)
+                .header("Content-Type", "application/json")
+                .body(body)
+                .unwrap()
+        }
+    }
+}

crates/brightstaff/src/main.rs

@@ -1,4 +1,5 @@
 use brightstaff::handlers::chat_completions::chat_completions;
+use brightstaff::handlers::models::list_models;
 use brightstaff::router::llm_router::RouterService;
 use brightstaff::utils::tracing::init_tracer;
 use bytes::Bytes;
@@ -52,6 +53,8 @@ async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
 
     let arch_config = Arc::new(config);
 
+    let llm_providers = Arc::new(arch_config.llm_providers.clone());
+
     debug!(
         "arch_config: {:?}",
         &serde_json::to_string(arch_config.as_ref()).unwrap()
@@ -84,10 +87,12 @@ async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
         let router_service = Arc::clone(&router_service);
         let llm_provider_endpoint = llm_provider_endpoint.clone();
 
+        let llm_providers = llm_providers.clone();
         let service = service_fn(move |req| {
             let router_service = Arc::clone(&router_service);
             let parent_cx = extract_context_from_request(&req);
             let llm_provider_endpoint = llm_provider_endpoint.clone();
+            let llm_providers = llm_providers.clone();
 
             async move {
                 match (req.method(), req.uri().path()) {
@@ -96,6 +101,35 @@ async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
                             .with_context(parent_cx)
                             .await
                     }
+                    (&Method::GET, "/v1/models") => {
+                        Ok(list_models(llm_providers).await)
+                    }
+                    (&Method::OPTIONS, "/v1/models") => {
+                        let mut response = Response::new(empty());
+                        *response.status_mut() = StatusCode::NO_CONTENT;
+                        response.headers_mut().insert(
+                            "Allow",
+                            "GET, OPTIONS".parse().unwrap(),
+                        );
+                        response.headers_mut().insert(
+                            "Access-Control-Allow-Origin",
+                            "*".parse().unwrap(),
+                        );
+                        response.headers_mut().insert(
+                            "Access-Control-Allow-Headers",
+                            "Authorization, Content-Type".parse().unwrap(),
+                        );
+                        response.headers_mut().insert(
+                            "Access-Control-Allow-Methods",
+                            "GET, POST, OPTIONS".parse().unwrap(),
+                        );
+                        response.headers_mut().insert(
+                            "Content-Type",
+                            "application/json".parse().unwrap(),
+                        );
+
+                        Ok(response)
+                    }
                     _ => {
                         let mut not_found = Response::new(empty());
                         *not_found.status_mut() = StatusCode::NOT_FOUND;