fix(mistral): supports the default llms.WithTools implementation (#970)

Author: douglarek

llms/mistral/mistralmodel.go

@@ -117,15 +117,28 @@ func mistralChatParamsFromCallOptions(callOpts *llms.CallOptions) sdk.ChatReques
 	chatOpts.Temperature = callOpts.Temperature
 	chatOpts.RandomSeed = callOpts.Seed
 	chatOpts.Tools = make([]sdk.Tool, 0)
-	for _, function := range callOpts.Functions {
-		chatOpts.Tools = append(chatOpts.Tools, sdk.Tool{
-			Type: "function",
-			Function: sdk.Function{
-				Name:        function.Name,
-				Description: function.Description,
-				Parameters:  function.Parameters,
-			},
-		})
+	if len(callOpts.Tools) > 0 {
+		for _, tool := range callOpts.Tools {
+			chatOpts.Tools = append(chatOpts.Tools, sdk.Tool{
+				Type: "function",
+				Function: sdk.Function{
+					Name:        tool.Function.Name,
+					Description: tool.Function.Description,
+					Parameters:  tool.Function.Parameters,
+				},
+			})
+		}
+	} else {
+		for _, function := range callOpts.Functions {
+			chatOpts.Tools = append(chatOpts.Tools, sdk.Tool{
+				Type: "function",
+				Function: sdk.Function{
+					Name:        function.Name,
+					Description: function.Description,
+					Parameters:  function.Parameters,
+				},
+			})
+		}
 	}
 	return chatOpts
 }
@@ -159,6 +172,16 @@ func generateNonStreamingContent(ctx context.Context, m *Model, callOptions *llm
 		toolCalls := choice.Message.ToolCalls
 		if len(toolCalls) > 0 {
 			langchainContentResponse.Choices[idx].FuncCall = (*llms.FunctionCall)(&toolCalls[0].Function)
+			for _, tool := range toolCalls {
+				langchainContentResponse.Choices[0].ToolCalls = append(langchainContentResponse.Choices[0].ToolCalls, llms.ToolCall{
+					ID:   tool.Id,
+					Type: string(tool.Type),
+					FunctionCall: &llms.FunctionCall{
+						Name:      tool.Function.Name,
+						Arguments: tool.Function.Arguments,
+					},
+				})
+			}
 		}
 	}
 	m.CallbacksHandler.HandleLLMGenerateContentEnd(ctx, langchainContentResponse)
@@ -192,6 +215,16 @@ func generateStreamingContent(ctx context.Context, m *Model, callOptions *llms.C
 				langchainContentResponse.Choices[0].StopReason = string(choice.FinishReason)
 				if len(choice.Delta.ToolCalls) > 0 {
 					langchainContentResponse.Choices[0].FuncCall = (*llms.FunctionCall)(&choice.Delta.ToolCalls[0].Function)
+					for _, tool := range choice.Delta.ToolCalls {
+						langchainContentResponse.Choices[0].ToolCalls = append(langchainContentResponse.Choices[0].ToolCalls, llms.ToolCall{
+							ID:   tool.Id,
+							Type: string(tool.Type),
+							FunctionCall: &llms.FunctionCall{
+								Name:      tool.Function.Name,
+								Arguments: tool.Function.Arguments,
+							},
+						})
+					}
 				}
 			}
 			err := callOptions.StreamingFunc(ctx, []byte(chunkStr))
@@ -209,19 +242,25 @@ func generateStreamingContent(ctx context.Context, m *Model, callOptions *llms.C
 func convertToMistralChatMessages(langchainMessages []llms.MessageContent) ([]sdk.ChatMessage, error) {
 	messages := make([]sdk.ChatMessage, 0)
 	for _, msg := range langchainMessages {
-		msgText := ""
 		for _, part := range msg.Parts {
-			textContent, ok := part.(llms.TextContent)
-			if !ok {
+			switch p := part.(type) {
+			case llms.TextContent:
+				chatMsg := sdk.ChatMessage{Content: p.Text, Role: string(msg.Role)}
+				setMistralChatMessageRole(&msg, &chatMsg) // #nosec G601
+				if chatMsg.Content != "" && chatMsg.Role != "" {
+					messages = append(messages, chatMsg)
+				}
+			case llms.ToolCallResponse:
+				chatMsg := sdk.ChatMessage{Role: string(msg.Role), Content: p.Content}
+				setMistralChatMessageRole(&msg, &chatMsg) // #nosec G601
+				messages = append(messages, chatMsg)
+			case llms.ToolCall:
+				chatMsg := sdk.ChatMessage{Role: string(msg.Role), ToolCalls: []sdk.ToolCall{{Id: p.ID, Type: sdk.ToolTypeFunction, Function: sdk.FunctionCall{Name: p.FunctionCall.Name, Arguments: p.FunctionCall.Arguments}}}}
+				setMistralChatMessageRole(&msg, &chatMsg) // #nosec G601
+				messages = append(messages, chatMsg)
+			default:
 				return nil, errors.New("unsupported content type encountered while preparing chat messages to send to mistral platform")
 			}
-			msgText += textContent.Text
-		}
-		chatMsg := sdk.ChatMessage{Content: msgText, Role: "user"}
-
-		setMistralChatMessageRole(&msg, &chatMsg) // #nosec G601
-		if chatMsg.Content != "" && chatMsg.Role != "" {
-			messages = append(messages, chatMsg)
 		}
 	}
 	return messages, nil