feat(aistudio): support non-streaming responses

internal/wsrelay/http.go

@@ -1,6 +1,7 @@
 package wsrelay
 
 import (
+	"bytes"
 	"context"
 	"errors"
 	"fmt"
@@ -44,21 +45,66 @@ func (m *Manager) RoundTrip(ctx context.Context, provider string, req *HTTPReque
 	if err != nil {
 		return nil, err
 	}
+	var (
+		streamMode bool
+		streamResp *HTTPResponse
+		streamBody bytes.Buffer
+	)
 	for {
 		select {
 		case <-ctx.Done():
 			return nil, ctx.Err()
 		case msg, ok := <-respCh:
 			if !ok {
+				if streamMode {
+					if streamResp == nil {
+						streamResp = &HTTPResponse{Status: http.StatusOK, Headers: make(http.Header)}
+					} else if streamResp.Headers == nil {
+						streamResp.Headers = make(http.Header)
+					}
+					streamResp.Body = append(streamResp.Body[:0], streamBody.Bytes()...)
+					return streamResp, nil
+				}
 				return nil, errors.New("wsrelay: connection closed during response")
 			}
 			switch msg.Type {
 			case MessageTypeHTTPResp:
-				return decodeResponse(msg.Payload), nil
+				resp := decodeResponse(msg.Payload)
+				if streamMode && streamBody.Len() > 0 && len(resp.Body) == 0 {
+					resp.Body = append(resp.Body[:0], streamBody.Bytes()...)
+				}
+				return resp, nil
 			case MessageTypeError:
 				return nil, decodeError(msg.Payload)
 			case MessageTypeStreamStart, MessageTypeStreamChunk:
-				// Ignore streaming noise in non-stream requests.
+				if msg.Type == MessageTypeStreamStart {
+					streamMode = true
+					streamResp = decodeResponse(msg.Payload)
+					if streamResp.Headers == nil {
+						streamResp.Headers = make(http.Header)
+					}
+					streamBody.Reset()
+					continue
+				}
+				if !streamMode {
+					streamMode = true
+					streamResp = &HTTPResponse{Status: http.StatusOK, Headers: make(http.Header)}
+				}
+				chunk := decodeChunk(msg.Payload)
+				if len(chunk) > 0 {
+					streamBody.Write(chunk)
+				}
+			case MessageTypeStreamEnd:
+				if !streamMode {
+					return &HTTPResponse{Status: http.StatusOK, Headers: make(http.Header)}, nil
+				}
+				if streamResp == nil {
+					streamResp = &HTTPResponse{Status: http.StatusOK, Headers: make(http.Header)}
+				} else if streamResp.Headers == nil {
+					streamResp.Headers = make(http.Header)
+				}
+				streamResp.Body = append(streamResp.Body[:0], streamBody.Bytes()...)
+				return streamResp, nil
 			default:
 			}
 		}