Support Gemini tool_calls.

relay/adaptor/gemini/main.go

@@ -4,6 +4,10 @@ import (
 	"bufio"
 	"encoding/json"
 	"fmt"
+	"io"
+	"net/http"
+	"strings"
+
 	"github.com/songquanpeng/one-api/common"
 	"github.com/songquanpeng/one-api/common/config"
 	"github.com/songquanpeng/one-api/common/helper"
@@ -13,9 +17,6 @@ import (
 	"github.com/songquanpeng/one-api/relay/adaptor/openai"
 	"github.com/songquanpeng/one-api/relay/constant"
 	"github.com/songquanpeng/one-api/relay/model"
-	"io"
-	"net/http"
-	"strings"
 
 	"github.com/gin-gonic/gin"
 )
@@ -154,6 +155,25 @@ type ChatPromptFeedback struct {
 	SafetyRatings []ChatSafetyRating `json:"safetyRatings"`
 }
 
+func getToolCalls(candidate *ChatCandidate) []model.Tool {
+	var toolCalls []model.Tool
+
+	item := candidate.Content.Parts[0]
+	if item.FunctionCall == nil {
+		return toolCalls
+	}
+	toolCall := model.Tool{
+		Id:   fmt.Sprintf("call_%s", random.GetUUID()),
+		Type: "function",
+		Function: model.Function{
+			Arguments: item.FunctionCall.Arguments,
+			Name:      item.FunctionCall.FunctionName,
+		},
+	}
+	toolCalls = append(toolCalls, toolCall)
+	return toolCalls
+}
+
 func responseGeminiChat2OpenAI(response *ChatResponse) *openai.TextResponse {
 	fullTextResponse := openai.TextResponse{
 		Id:      fmt.Sprintf("chatcmpl-%s", random.GetUUID()),
@@ -165,13 +185,15 @@ func responseGeminiChat2OpenAI(response *ChatResponse) *openai.TextResponse {
 		choice := openai.TextResponseChoice{
 			Index: i,
 			Message: model.Message{
-				Role:    "assistant",
-				Content: "",
+				Role: "assistant",
 			},
 			FinishReason: constant.StopFinishReason,
 		}
-		if len(candidate.Content.Parts) > 0 {
-			choice.Message.Content = candidate.Content.Parts[0].Text
+		if candidate.Content.Parts[i].FunctionCall != nil {
+			choice.Message.ToolCalls = getToolCalls(&candidate)
+		} else if len(candidate.Content.Parts) > 0 {
+			choice.Message.Content = candidate.Content.Parts[i].Text
+
 		}
 		fullTextResponse.Choices = append(fullTextResponse.Choices, choice)
 	}

relay/adaptor/gemini/model.go

@@ -12,9 +12,15 @@ type InlineData struct {
 	Data     string `json:"data"`
 }
 
+type FunctionCall struct {
+	FunctionName string `json:"name"`
+	Arguments    any    `json:"args"`
+}
+
 type Part struct {
-	Text       string      `json:"text,omitempty"`
-	InlineData *InlineData `json:"inlineData,omitempty"`
+	Text         string        `json:"text,omitempty"`
+	InlineData   *InlineData   `json:"inlineData,omitempty"`
+	FunctionCall *FunctionCall `json:"functionCall,omitempty"`
 }
 
 type ChatContent struct {