fix: address responses SSE review feedback

sdk/api/handlers/openai/openai_responses_handlers.go

@@ -26,13 +26,15 @@ func writeResponsesSSEChunk(w io.Writer, chunk []byte) {
 	if w == nil || len(chunk) == 0 {
 		return
 	}
-	_, _ = w.Write(chunk)
+	if _, err := w.Write(chunk); err != nil {
-	switch {
-	case bytes.HasSuffix(chunk, []byte("\n\n")):
 		return
-	case bytes.HasSuffix(chunk, []byte("\n")):
+	}
+	if bytes.HasSuffix(chunk, []byte("\n\n")) {
+		return
+	}
+	if bytes.HasSuffix(chunk, []byte("\n")) {
 		_, _ = w.Write([]byte("\n"))
-	default:
+	} else {
 		_, _ = w.Write([]byte("\n\n"))
 	}
 }

sdk/api/handlers/openai/openai_responses_handlers_stream_error_test.go

@@ -41,38 +41,3 @@ func TestForwardResponsesStreamTerminalErrorUsesResponsesErrorChunk(t *testing.T
 		t.Fatalf("expected streaming error chunk (top-level type), got HTTP error body: %q", body)
 	}
 }
-
-func TestForwardResponsesStreamSeparatesDataOnlySSEChunks(t *testing.T) {
-	gin.SetMode(gin.TestMode)
-	base := handlers.NewBaseAPIHandlers(&sdkconfig.SDKConfig{}, nil)
-	h := NewOpenAIResponsesAPIHandler(base)
-
-	recorder := httptest.NewRecorder()
-	c, _ := gin.CreateTestContext(recorder)
-	c.Request = httptest.NewRequest(http.MethodPost, "/v1/responses", nil)
-
-	flusher, ok := c.Writer.(http.Flusher)
-	if !ok {
-		t.Fatalf("expected gin writer to implement http.Flusher")
-	}
-
-	data := make(chan []byte, 2)
-	errs := make(chan *interfaces.ErrorMessage)
-	data <- []byte("data: {\"type\":\"response.output_item.done\",\"item\":{\"type\":\"function_call\",\"arguments\":\"{}\"}}")
-	data <- []byte("data: {\"type\":\"response.completed\",\"response\":{\"id\":\"resp-1\",\"output\":[]}}")
-	close(data)
-	close(errs)
-
-	h.forwardResponsesStream(c, flusher, func(error) {}, data, errs)
-	body := recorder.Body.String()
-
-	if !strings.Contains(body, "data: {\"type\":\"response.output_item.done\"") {
-		t.Fatalf("expected first SSE data chunk, got: %q", body)
-	}
-	if !strings.Contains(body, "\n\ndata: {\"type\":\"response.completed\"") {
-		t.Fatalf("expected blank-line separation before second SSE event, got: %q", body)
-	}
-	if strings.Contains(body, "arguments\":\"{}\"}}data: {\"type\":\"response.completed\"") {
-		t.Fatalf("second SSE event was concatenated onto first event body: %q", body)
-	}
-}

sdk/api/handlers/openai/openai_responses_handlers_stream_test.go

@@ -0,0 +1,48 @@
+package openai
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/interfaces"
+	"github.com/router-for-me/CLIProxyAPI/v6/sdk/api/handlers"
+	sdkconfig "github.com/router-for-me/CLIProxyAPI/v6/sdk/config"
+)
+
+func TestForwardResponsesStreamSeparatesDataOnlySSEChunks(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	base := handlers.NewBaseAPIHandlers(&sdkconfig.SDKConfig{}, nil)
+	h := NewOpenAIResponsesAPIHandler(base)
+
+	recorder := httptest.NewRecorder()
+	c, _ := gin.CreateTestContext(recorder)
+	c.Request = httptest.NewRequest(http.MethodPost, "/v1/responses", nil)
+
+	flusher, ok := c.Writer.(http.Flusher)
+	if !ok {
+		t.Fatalf("expected gin writer to implement http.Flusher")
+	}
+
+	data := make(chan []byte, 2)
+	errs := make(chan *interfaces.ErrorMessage)
+	data <- []byte("data: {\"type\":\"response.output_item.done\",\"item\":{\"type\":\"function_call\",\"arguments\":\"{}\"}}")
+	data <- []byte("data: {\"type\":\"response.completed\",\"response\":{\"id\":\"resp-1\",\"output\":[]}}")
+	close(data)
+	close(errs)
+
+	h.forwardResponsesStream(c, flusher, func(error) {}, data, errs)
+	body := recorder.Body.String()
+
+	if !strings.Contains(body, "data: {\"type\":\"response.output_item.done\"") {
+		t.Fatalf("expected first SSE data chunk, got: %q", body)
+	}
+	if !strings.Contains(body, "\n\ndata: {\"type\":\"response.completed\"") {
+		t.Fatalf("expected blank-line separation before second SSE event, got: %q", body)
+	}
+	if strings.Contains(body, "arguments\":\"{}\"}}data: {\"type\":\"response.completed\"") {
+		t.Fatalf("second SSE event was concatenated onto first event body: %q", body)
+	}
+}