feat: Add FunctionResponse type and enhance GeminiPart structure

- Introduced a new `FunctionResponse` type to encapsulate function call responses, improving the clarity of data handling.
- Updated the `GeminiPart` struct to include the new `FunctionResponse` field, allowing for better representation of function call results in Gemini requests.
- Modified the `CovertGemini2OpenAI` function to handle tool calls more effectively by setting the message role and appending function responses to the Gemini parts, enhancing the integration with OpenAI and Gemini systems.

relay/channel/gemini/dto.go

@@ -18,10 +18,16 @@ type FunctionCall struct {
 	Arguments    any    `json:"args"`
 }
 
+type FunctionResponse struct {
+	Name     string `json:"name"`
+	Response any    `json:"response"`
+}
+
 type GeminiPart struct {
 	Text             string            `json:"text,omitempty"`
 	InlineData       *GeminiInlineData `json:"inlineData,omitempty"`
 	FunctionCall     *FunctionCall     `json:"functionCall,omitempty"`
+	FunctionResponse *FunctionResponse `json:"functionResponse,omitempty"`
 }
 
 type GeminiChatContent struct {

relay/channel/gemini/relay-gemini.go

@@ -2,6 +2,7 @@ package gemini
 
 import (
 	"bufio"
+	"context"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -108,16 +109,14 @@ func CovertGemini2OpenAI(textRequest dto.GeneralOpenAIRequest) (*GeminiChatReque
 				},
 			}
 			continue
-		} else if message.Role == "tool" {
-			message.Role = "model"
 		}
-
 		var parts []GeminiPart
 		content := GeminiChatContent{
 			Role: message.Role,
 		}
 		isToolCall := false
 		if message.ToolCalls != nil {
+			message.Role = "model"
 			isToolCall = true
 			for _, call := range message.ParseToolCalls() {
 				toolCall := GeminiPart{
@@ -130,6 +129,20 @@ func CovertGemini2OpenAI(textRequest dto.GeneralOpenAIRequest) (*GeminiChatReque
 			}
 		}
 		if !isToolCall {
+			if message.Role == "tool" {
+				content.Role = "user"
+				name := ""
+				if message.Name != nil {
+					name = *message.Name
+				}
+				functionResp := &FunctionResponse{
+					Name:     name,
+					Response: common.StrToMap(message.StringContent()),
+				}
+				parts = append(parts, GeminiPart{
+					FunctionResponse: functionResp,
+				})
+			} else {
 				openaiContent := message.ParseContent()
 				imageNum := 0
 				for _, part := range openaiContent {
@@ -168,6 +181,7 @@ func CovertGemini2OpenAI(textRequest dto.GeneralOpenAIRequest) (*GeminiChatReque
 					}
 				}
 			}
+		}
 		content.Parts = parts
 
 		// there's no assistant role in gemini and API shall vomit if Role is not user or model
@@ -176,6 +190,7 @@ func CovertGemini2OpenAI(textRequest dto.GeneralOpenAIRequest) (*GeminiChatReque
 		}
 		geminiRequest.Contents = append(geminiRequest.Contents, content)
 	}
+	common.LogJson(context.Background(), "gemini_request", geminiRequest)
 	return &geminiRequest, nil
 }