final

internal/infrastructure/llm/lmstudio.go

@@ -0,0 +1,123 @@
+package llm
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+
+	"github.com/paramah/ai_devs4/s01e02/internal/domain"
+)
+
+// LMStudioProvider implements domain.LLMProvider for local LM Studio
+type LMStudioProvider struct {
+	baseURL string
+	model   string
+	client  *http.Client
+}
+
+// NewLMStudioProvider creates a new LM Studio provider
+func NewLMStudioProvider(baseURL, model string) *LMStudioProvider {
+	return &LMStudioProvider{
+		baseURL: baseURL,
+		model:   model,
+		client:  &http.Client{},
+	}
+}
+
+type lmStudioRequest struct {
+	Model       string              `json:"model"`
+	Messages    []domain.LLMMessage `json:"messages"`
+	Tools       []domain.Tool       `json:"tools,omitempty"`
+	ToolChoice  interface{}         `json:"tool_choice,omitempty"`
+	Temperature float64             `json:"temperature,omitempty"`
+}
+
+type lmStudioResponse struct {
+	Choices []struct {
+		Message      domain.LLMMessage `json:"message"`
+		FinishReason string            `json:"finish_reason"`
+	} `json:"choices"`
+	Error json.RawMessage `json:"error,omitempty"`
+}
+
+// Chat sends a chat request with function calling support
+func (p *LMStudioProvider) Chat(ctx context.Context, request domain.LLMRequest) (*domain.LLMResponse, error) {
+	reqBody := lmStudioRequest{
+		Model:       p.model,
+		Messages:    request.Messages,
+		Tools:       request.Tools,
+		Temperature: request.Temperature,
+	}
+
+	if request.ToolChoice != "" {
+		if request.ToolChoice == "auto" {
+			reqBody.ToolChoice = "auto"
+		} else {
+			reqBody.ToolChoice = map[string]interface{}{
+				"type": "function",
+				"function": map[string]string{
+					"name": request.ToolChoice,
+				},
+			}
+		}
+	}
+
+	jsonData, err := json.Marshal(reqBody)
+	if err != nil {
+		return nil, fmt.Errorf("marshaling request: %w", err)
+	}
+
+	url := p.baseURL + "/v1/chat/completions"
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewBuffer(jsonData))
+	if err != nil {
+		return nil, fmt.Errorf("creating request: %w", err)
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := p.client.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("sending request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("reading response: %w", err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("HTTP %d: %s", resp.StatusCode, string(body))
+	}
+
+	var apiResp lmStudioResponse
+	if err := json.Unmarshal(body, &apiResp); err != nil {
+		return nil, fmt.Errorf("unmarshaling response: %w\nResponse body: %s", err, string(body))
+	}
+
+	if len(apiResp.Error) > 0 {
+		var errStr string
+		if err := json.Unmarshal(apiResp.Error, &errStr); err == nil {
+			return nil, fmt.Errorf("API error: %s", errStr)
+		}
+		var errObj struct {
+			Message string `json:"message"`
+		}
+		if err := json.Unmarshal(apiResp.Error, &errObj); err == nil {
+			return nil, fmt.Errorf("API error: %s", errObj.Message)
+		}
+		return nil, fmt.Errorf("API error: %s", string(apiResp.Error))
+	}
+
+	if len(apiResp.Choices) == 0 {
+		return nil, fmt.Errorf("no choices in response. Response body: %s", string(body))
+	}
+
+	return &domain.LLMResponse{
+		Message:      apiResp.Choices[0].Message,
+		FinishReason: apiResp.Choices[0].FinishReason,
+	}, nil
+}