chore: commit pending gateway changes

apps/api/internal/httpapi/streaming.go

@@ -2,10 +2,42 @@ package httpapi
 
 import "net/http"
 
-func writeCompatibleStream(w http.ResponseWriter, kind string, model string, output map[string]any) {
+func prepareCompatibleStream(w http.ResponseWriter) http.Flusher {
 	w.Header().Set("Content-Type", "text/event-stream")
 	w.Header().Set("Cache-Control", "no-cache")
 	w.Header().Set("Connection", "keep-alive")
+	flusher, _ := w.(http.Flusher)
+	return flusher
+}
+
+func writeCompatibleDelta(w http.ResponseWriter, kind string, model string, content string) {
+	if kind == "responses" {
+		sendSSE(w, "response.output_text.delta", map[string]any{"type": "response.output_text.delta", "delta": content})
+		return
+	}
+	sendSSE(w, "message", map[string]any{
+		"id":      "chatcmpl-stream",
+		"object":  "chat.completion.chunk",
+		"model":   model,
+		"choices": []any{map[string]any{"index": 0, "delta": map[string]any{"content": content}, "finish_reason": nil}},
+	})
+}
+
+func writeCompatibleDone(w http.ResponseWriter, kind string, model string, output map[string]any) {
+	if kind == "responses" {
+		sendSSE(w, "response.completed", map[string]any{"type": "response.completed", "response": output})
+		return
+	}
+	sendSSE(w, "message", map[string]any{
+		"id":      firstString(output["id"], "chatcmpl-stream"),
+		"object":  "chat.completion.chunk",
+		"model":   model,
+		"choices": []any{map[string]any{"index": 0, "delta": map[string]any{}, "finish_reason": "stop"}},
+	})
+}
+
+func writeCompatibleStream(w http.ResponseWriter, kind string, model string, output map[string]any) {
+	prepareCompatibleStream(w)
 	content := extractOutputText(output)
 	if content == "" {
 		content = "done"
@@ -29,6 +61,13 @@ func writeCompatibleStream(w http.ResponseWriter, kind string, model string, out
 	})
 }
 
+func firstString(value any, fallback string) string {
+	if text, ok := value.(string); ok && text != "" {
+		return text
+	}
+	return fallback
+}
+
 func extractOutputText(output map[string]any) string {
 	if text, ok := output["output_text"].(string); ok {
 		return text