feat: migrate backend from rust to go

This commit replaces the Axum/Rust backend with a Gin/Go implementation. The original Rust code has been archived in the 'rust' branch.

internal/providers/deepseek.go

@@ -0,0 +1,143 @@
+package providers
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"llm-proxy/internal/config"
+	"llm-proxy/internal/models"
+	"github.com/go-resty/resty/v2"
+)
+
+type DeepSeekProvider struct {
+	client *resty.Client
+	config config.DeepSeekConfig
+	apiKey string
+}
+
+func NewDeepSeekProvider(cfg config.DeepSeekConfig, apiKey string) *DeepSeekProvider {
+	return &DeepSeekProvider{
+		client: resty.New(),
+		config: cfg,
+		apiKey: apiKey,
+	}
+}
+
+func (p *DeepSeekProvider) Name() string {
+	return "deepseek"
+}
+
+func (p *DeepSeekProvider) ChatCompletion(ctx context.Context, req *models.UnifiedRequest) (*models.ChatCompletionResponse, error) {
+	messagesJSON, err := MessagesToOpenAIJSON(req.Messages)
+	if err != nil {
+		return nil, fmt.Errorf("failed to convert messages: %w", err)
+	}
+
+	body := BuildOpenAIBody(req, messagesJSON, false)
+
+	// Sanitize for deepseek-reasoner
+	if req.Model == "deepseek-reasoner" {
+		delete(body, "temperature")
+		delete(body, "top_p")
+		delete(body, "presence_penalty")
+		delete(body, "frequency_penalty")
+		
+		// Ensure assistant messages have content and reasoning_content
+		if msgs, ok := body["messages"].([]interface{}); ok {
+			for _, m := range msgs {
+				if msg, ok := m.(map[string]interface{}); ok {
+					if msg["role"] == "assistant" {
+						if msg["reasoning_content"] == nil {
+							msg["reasoning_content"] = " "
+						}
+						if msg["content"] == nil || msg["content"] == "" {
+							msg["content"] = ""
+						}
+					}
+				}
+			}
+		}
+	}
+
+	resp, err := p.client.R().
+		SetContext(ctx).
+		SetHeader("Authorization", "Bearer "+p.apiKey).
+		SetBody(body).
+		Post(fmt.Sprintf("%s/chat/completions", p.config.BaseURL))
+
+	if err != nil {
+		return nil, fmt.Errorf("request failed: %w", err)
+	}
+
+	if !resp.IsSuccess() {
+		return nil, fmt.Errorf("DeepSeek API error (%d): %s", resp.StatusCode(), resp.String())
+	}
+
+	var respJSON map[string]interface{}
+	if err := json.Unmarshal(resp.Body(), &respJSON); err != nil {
+		return nil, fmt.Errorf("failed to parse response: %w", err)
+	}
+
+	return ParseOpenAIResponse(respJSON, req.Model)
+}
+
+func (p *DeepSeekProvider) ChatCompletionStream(ctx context.Context, req *models.UnifiedRequest) (<-chan *models.ChatCompletionStreamResponse, error) {
+	messagesJSON, err := MessagesToOpenAIJSON(req.Messages)
+	if err != nil {
+		return nil, fmt.Errorf("failed to convert messages: %w", err)
+	}
+
+	body := BuildOpenAIBody(req, messagesJSON, true)
+
+	// Sanitize for deepseek-reasoner
+	if req.Model == "deepseek-reasoner" {
+		delete(body, "temperature")
+		delete(body, "top_p")
+		delete(body, "presence_penalty")
+		delete(body, "frequency_penalty")
+		
+		// Ensure assistant messages have content and reasoning_content
+		if msgs, ok := body["messages"].([]interface{}); ok {
+			for _, m := range msgs {
+				if msg, ok := m.(map[string]interface{}); ok {
+					if msg["role"] == "assistant" {
+						if msg["reasoning_content"] == nil {
+							msg["reasoning_content"] = " "
+						}
+						if msg["content"] == nil || msg["content"] == "" {
+							msg["content"] = ""
+						}
+					}
+				}
+			}
+		}
+	}
+
+	resp, err := p.client.R().
+		SetContext(ctx).
+		SetHeader("Authorization", "Bearer "+p.apiKey).
+		SetBody(body).
+		SetDoNotParseResponse(true).
+		Post(fmt.Sprintf("%s/chat/completions", p.config.BaseURL))
+
+	if err != nil {
+		return nil, fmt.Errorf("request failed: %w", err)
+	}
+
+	if !resp.IsSuccess() {
+		return nil, fmt.Errorf("DeepSeek API error (%d): %s", resp.StatusCode(), resp.String())
+	}
+
+	ch := make(chan *models.ChatCompletionStreamResponse)
+	
+	go func() {
+		defer close(ch)
+		err := StreamOpenAI(resp.RawBody(), ch)
+		if err != nil {
+			fmt.Printf("DeepSeek Stream error: %v\n", err)
+		}
+	}()
+
+	return ch, nil
+}