fix empty response when receiving runner error

docs/api.md

@@ -252,7 +252,7 @@ curl http://localhost:11434/api/generate -d '{
     "penalize_newline": true,
     "stop": ["\n", "user:"],
     "numa": false,
-    "num_ctx": 4,
+    "num_ctx": 1024,
     "num_batch": 2,
     "num_gqa": 1,
     "num_gpu": 1,
@@ -267,7 +267,7 @@ curl http://localhost:11434/api/generate -d '{
     "rope_frequency_base": 1.1,
     "rope_frequency_scale": 0.8,
     "num_thread": 8
-    }
+  }
 }'
 ```
 

server/routes.go

@@ -300,19 +300,30 @@ func GenerateHandler(c *gin.Context) {
 	}()
 
 	if req.Stream != nil && !*req.Stream {
-		// Wait for the channel to close
-		var r api.GenerateResponse
+		// Accumulate responses into the final response
+		var final api.GenerateResponse
 		var sb strings.Builder
 		for resp := range ch {
-			var ok bool
-			if r, ok = resp.(api.GenerateResponse); !ok {
-				c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+			switch r := resp.(type) {
+			case api.GenerateResponse:
+				sb.WriteString(r.Response)
+				final = r
+			case gin.H:
+				if errorMsg, ok := r["error"].(string); ok {
+					c.JSON(http.StatusInternalServerError, gin.H{"error": errorMsg})
+					return
+				} else {
+					c.JSON(http.StatusInternalServerError, gin.H{"error": "unexpected error format in response"})
+					return
+				}
+			default:
+				c.JSON(http.StatusInternalServerError, gin.H{"error": "unexpected error"})
 				return
 			}
-			sb.WriteString(r.Response)
 		}
-		r.Response = sb.String()
-		c.JSON(http.StatusOK, r)
+
+		final.Response = sb.String()
+		c.JSON(http.StatusOK, final)
 		return
 	}
 
@@ -1008,21 +1019,30 @@ func ChatHandler(c *gin.Context) {
 	}()
 
 	if req.Stream != nil && !*req.Stream {
-		// Wait for the channel to close
-		var r api.ChatResponse
+		// Accumulate responses into the final response
+		var final api.ChatResponse
 		var sb strings.Builder
 		for resp := range ch {
-			var ok bool
-			if r, ok = resp.(api.ChatResponse); !ok {
-				c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-				return
-			}
-			if r.Message != nil {
+			switch r := resp.(type) {
+			case api.ChatResponse:
 				sb.WriteString(r.Message.Content)
+				final = r
+			case gin.H:
+				if errorMsg, ok := r["error"].(string); ok {
+					c.JSON(http.StatusInternalServerError, gin.H{"error": errorMsg})
+					return
+				} else {
+					c.JSON(http.StatusInternalServerError, gin.H{"error": "unexpected error format in response"})
+					return
+				}
+			default:
+				c.JSON(http.StatusInternalServerError, gin.H{"error": "unexpected error"})
+				return
 			}
 		}
-		r.Message = &api.Message{Role: "assistant", Content: sb.String()}
-		c.JSON(http.StatusOK, r)
+
+		final.Message = &api.Message{Role: "assistant", Content: sb.String()}
+		c.JSON(http.StatusOK, final)
 		return
 	}