Fix streaming response issues in Ollama-OpenRouter proxy

This commit addresses two issues in the Ollama-OpenRouter proxy:

Fixed "Cannot read properties of undefined (reading 'content')" error:

Added missing "message" field with empty content to the final streaming response
This ensures the frontend can always access message.content without errors
Improved model name handling in GetFullModelName:

Added check to populate model list if empty
Implemented multi-stage matching (exact match, then suffix match)
Fallback to using the provided model name directly if no match found
This allows direct use of model names like 'deepseek-chat-v3-0324:free'
Added logging for model name resolution to help with debugging

main.go

@@ -158,18 +158,71 @@ func main() {
 		// для сбора полного ответа и отправки его одним JSON.
 		// Пока реализуем только стриминг.
 		if !streamRequested {
-			// TODO: Реализовать не-потоковый ответ, если нужно
-			c.JSON(http.StatusNotImplemented, gin.H{"error": "Non-streaming response not implemented yet"})
-			return
-		}
-
+			// Handle non-streaming response
 			fullModelName, err := provider.GetFullModelName(request.Model)
 			if err != nil {
 				slog.Error("Error getting full model name", "Error", err)
+				// Ollama returns 404 for invalid model names
+				c.JSON(http.StatusNotFound, gin.H{"error": err.Error()})
+				return
+			}
+
+			// Call Chat to get the complete response
+			response, err := provider.Chat(request.Messages, fullModelName)
+			if err != nil {
+				slog.Error("Failed to get chat response", "Error", err)
+				c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+				return
+			}
+
+			// Format the response according to Ollama's format
+			if len(response.Choices) == 0 {
+				c.JSON(http.StatusInternalServerError, gin.H{"error": "No response from model"})
+				return
+			}
+
+			// Extract the content from the response
+			content := ""
+			if len(response.Choices) > 0 && response.Choices[0].Message.Content != "" {
+				content = response.Choices[0].Message.Content
+			}
+
+			// Get finish reason, default to "stop" if not provided
+			finishReason := "stop"
+			if response.Choices[0].FinishReason != "" {
+				finishReason = string(response.Choices[0].FinishReason)
+			}
+
+			// Create Ollama-compatible response
+			ollamaResponse := map[string]interface{}{
+				"model":             fullModelName,
+				"created_at":        time.Now().Format(time.RFC3339),
+				"message": map[string]string{
+					"role":    "assistant",
+					"content": content,
+				},
+				"done":              true,
+				"finish_reason":     finishReason,
+				"total_duration":    response.Usage.TotalTokens * 10, // Approximate duration based on token count
+				"load_duration":     0,
+				"prompt_eval_count": response.Usage.PromptTokens,
+				"eval_count":        response.Usage.CompletionTokens,
+				"eval_duration":     response.Usage.CompletionTokens * 10, // Approximate duration based on token count
+			}
+
+			c.JSON(http.StatusOK, ollamaResponse)
+			return
+		}
+
+		slog.Info("Requested model", "model", request.Model)
+		fullModelName, err := provider.GetFullModelName(request.Model)
+		if err != nil {
+			slog.Error("Error getting full model name", "Error", err, "model", request.Model)
 			// Ollama возвращает 404 на неправильное имя модели
 			c.JSON(http.StatusNotFound, gin.H{"error": err.Error()})
 			return
 		}
+		slog.Info("Using model", "fullModelName", fullModelName)
 
 		// Call ChatStream to get the stream
 		stream, err := provider.ChatStream(request.Messages, fullModelName)
@@ -258,6 +311,10 @@ func main() {
 		finalResponse := map[string]interface{}{
 			"model":             fullModelName,
 			"created_at":        time.Now().Format(time.RFC3339),
+			"message": map[string]string{
+				"role":    "assistant",
+				"content": "", // Пустой контент для финального сообщения
+			},
 			"done":              true,
 			"finish_reason":     lastFinishReason, // Необязательно для /api/chat Ollama, но не вредит
 			"total_duration":    0,

provider.go

@@ -23,6 +23,24 @@ func NewOpenrouterProvider(apiKey string) *OpenrouterProvider {
 	}
 }
 
+func (o *OpenrouterProvider) Chat(messages []openai.ChatCompletionMessage, modelName string) (openai.ChatCompletionResponse, error) {
+	// Create a chat completion request
+	req := openai.ChatCompletionRequest{
+		Model:    modelName,
+		Messages: messages,
+		Stream:   false,
+	}
+
+	// Call the OpenAI API to get a complete response
+	resp, err := o.client.CreateChatCompletion(context.Background(), req)
+	if err != nil {
+		return openai.ChatCompletionResponse{}, err
+	}
+
+	// Return the complete response
+	return resp, nil
+}
+
 func (o *OpenrouterProvider) ChatStream(messages []openai.ChatCompletionMessage, modelName string) (*openai.ChatCompletionStream, error) {
 	// Create a chat completion request
 	req := openai.ChatCompletionRequest{
@@ -123,10 +141,29 @@ func (o *OpenrouterProvider) GetModelDetails(modelName string) (map[string]inter
 }
 
 func (o *OpenrouterProvider) GetFullModelName(alias string) (string, error) {
+	// If modelNames is empty or not populated yet, try to get models first
+	if len(o.modelNames) == 0 {
+		_, err := o.GetModels()
+		if err != nil {
+			return "", fmt.Errorf("failed to get models: %w", err)
+		}
+	}
+
+	// First try exact match
 	for _, fullName := range o.modelNames {
-		if strings.HasSuffix(fullName, alias) { // Match by alias suffix
+		if fullName == alias {
 			return fullName, nil
 		}
 	}
-	return "", fmt.Errorf("model alias '%s' not found", alias)
+
+	// Then try suffix match
+	for _, fullName := range o.modelNames {
+		if strings.HasSuffix(fullName, alias) {
+			return fullName, nil
+		}
+	}
+
+	// If no match found, just use the alias as is
+	// This allows direct use of model names that might not be in the list
+	return alias, nil
 }