Support Gradio 6 call_v2 protocol with named parameters and fallback

gr2gw_test.go

@@ -2196,6 +2196,132 @@ func TestExecuteCallCompletionSessionHashAndTrailingStateTrim(t *testing.T) {
   }
 }
 
+// TestGradio6CallV2Protocol verifies that Gradio 6 spaces resolve protocol call_v2,
+// submit named JSON parameters to /call/v2/{endpoint}, and stream from /call/{endpoint}/{event_id}.
+func TestGradio6CallV2Protocol(t *testing.T) {
+  var receivedBody map[string]interface{}
+  var callEndpointReached string
+
+  ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+    if r.URL.Path == "/gradio_api/info" {
+      w.Header().Set("Content-Type", "application/json")
+      json.NewEncoder(w).Encode(map[string]interface{}{
+        "named_endpoints": map[string]interface{}{
+          "/answer": map[string]interface{}{
+            "parameters": []map[string]interface{}{
+              {
+                "parameter_name": "prompt",
+                "component":      "Textbox",
+                "label":          "Prompt",
+              },
+            },
+            "code_snippets": map[string]interface{}{
+              "bash": "curl -X POST http://localhost:7860/gradio_api/call/v2/answer -s -H \"Content-Type: application/json\" -d '{\"prompt\": \"Hello!!\"}' | awk -F'\"' '{ print $4}' | read EVENT_ID; curl -N http://localhost:7860/gradio_api/call/answer/$EVENT_ID",
+            },
+          },
+        },
+      })
+      return
+    }
+
+    if r.URL.Path == "/config" {
+      w.Header().Set("Content-Type", "application/json")
+      json.NewEncoder(w).Encode(map[string]interface{}{
+        "version": "6.13.0",
+        "components": []map[string]interface{}{
+          {"id": 1, "type": "textbox", "props": map[string]interface{}{"label": "Prompt"}},
+        },
+        "dependencies": []map[string]interface{}{
+          {
+            "id":       0,
+            "api_name": "answer",
+            "inputs":   []int{1},
+            "outputs":  []int{1},
+            "types":    map[string]interface{}{"generator": true},
+          },
+        },
+      })
+      return
+    }
+
+    if r.URL.Path == "/gradio_api/call/v2/answer" {
+      callEndpointReached = r.URL.Path
+      if err := json.NewDecoder(r.Body).Decode(&receivedBody); err != nil {
+        http.Error(w, err.Error(), http.StatusBadRequest)
+        return
+      }
+      w.Header().Set("Content-Type", "application/json")
+      json.NewEncoder(w).Encode(map[string]interface{}{
+        "event_id": "evt-v2-777",
+      })
+      return
+    }
+
+    if r.URL.Path == "/gradio_api/call/answer/evt-v2-777" {
+      w.Header().Set("Content-Type", "text/event-stream")
+      w.Header().Set("Cache-Control", "no-cache")
+      w.WriteHeader(http.StatusOK)
+      flusher, _ := w.(http.Flusher)
+      fmt.Fprintf(w, "event: complete\ndata: [\"Hello from Gradio 6 v2!\"]\n\n")
+      if flusher != nil {
+        flusher.Flush()
+      }
+      return
+    }
+
+    http.NotFound(w, r)
+  }))
+  defer ts.Close()
+
+  gw := NewGradioGateway(ts.URL, "", 10*time.Second)
+
+  // 1. Verify inspection resolved call_v2 protocol
+  disc, err := InspectSpace(gw.client, ts.URL, DefaultUserAgent)
+  if err != nil {
+    t.Fatalf("InspectSpace failed: %v", err)
+  }
+  if disc.Protocol != "call_v2" {
+    t.Errorf("expected Protocol call_v2, got %s", disc.Protocol)
+  }
+  if disc.Endpoint != "/answer" {
+    t.Errorf("expected Endpoint /answer, got %s", disc.Endpoint)
+  }
+
+  // 2. Execute chat completion
+  req := ChatCompletionRequest{
+    Model: "default",
+    Messages: []ChatMessage{
+      {Role: "user", Content: "Hello test"},
+    },
+  }
+  httpReq := httptest.NewRequest("POST", "/v1/chat/completions", nil)
+  rec := httptest.NewRecorder()
+
+  err = gw.ExecuteChatCompletion(rec, httpReq, req)
+  if err != nil {
+    t.Fatalf("ExecuteChatCompletion failed: %v", err)
+  }
+
+  if rec.Code != http.StatusOK {
+    t.Fatalf("expected status 200, got %d: %s", rec.Code, rec.Body.String())
+  }
+  if callEndpointReached != "/gradio_api/call/v2/answer" {
+    t.Errorf("expected call to /gradio_api/call/v2/answer, got %s", callEndpointReached)
+  }
+  if promptVal, ok := receivedBody["prompt"].(string); !ok || promptVal != "Hello test" {
+    t.Errorf("expected named param 'prompt' with value 'Hello test', got %v", receivedBody)
+  }
+
+  var resp ChatCompletionResponse
+  if err := json.NewDecoder(rec.Body).Decode(&resp); err != nil {
+    t.Fatalf("failed to decode response: %v", err)
+  }
+  if len(resp.Choices) == 0 || resp.Choices[0].Message.Content != "Hello from Gradio 6 v2!" {
+    t.Errorf("unexpected content: %v", resp.Choices[0].Message.Content)
+  }
+}
+
+