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package llm
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import (
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"bufio"
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"io"
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"log"
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"net/http"
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"strings"
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"time"
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"github.com/yourname/cyrene-ai/ai-core/internal/model"
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)
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// OpenAIConfig OpenAI适配器配置
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type OpenAIConfig struct {
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BaseURL string // API基础URL
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APIKey string // API密钥
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Model string // 主模型
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FallbackModel string // 备用模型（主模型不可用时）
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MaxRetries int // 最大重试次数
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Timeout time.Duration // 请求超时
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}
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// OpenAIProvider OpenAI兼容的LLM提供商
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type OpenAIProvider struct {
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config OpenAIConfig
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httpClient *http.Client
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}
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// NewOpenAIProvider 创建OpenAI提供商
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func NewOpenAIProvider(cfg OpenAIConfig) *OpenAIProvider {
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if cfg.MaxRetries == 0 {
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cfg.MaxRetries = 3
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}
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if cfg.Timeout == 0 {
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cfg.Timeout = 60 * time.Second
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}
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return &OpenAIProvider{
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config: cfg,
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httpClient: &http.Client{
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Timeout: cfg.Timeout,
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},
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}
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}
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// openAIRequest OpenAI请求结构
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type openAIRequest struct {
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Model string `json:"model"`
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Messages []openAIMessage `json:"messages"`
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Temperature float64 `json:"temperature"`
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MaxTokens int `json:"max_tokens,omitempty"`
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Stream bool `json:"stream"`
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}
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type openAIMessage struct {
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Role string `json:"role"`
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Content string `json:"content"`
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}
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// openAIResponse OpenAI响应结构
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type openAIResponse struct {
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ID string `json:"id"`
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Object string `json:"object"`
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Choices []openAIChoice `json:"choices"`
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Usage openAIUsage `json:"usage,omitempty"`
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Error *openAIError `json:"error,omitempty"`
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}
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type openAIChoice struct {
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Index int `json:"index"`
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Message openAIMessage `json:"message"`
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FinishReason string `json:"finish_reason"`
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}
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type openAIUsage struct {
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PromptTokens int `json:"prompt_tokens"`
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CompletionTokens int `json:"completion_tokens"`
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TotalTokens int `json:"total_tokens"`
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}
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type openAIError struct {
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Message string `json:"message"`
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Type string `json:"type"`
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Code string `json:"code,omitempty"`
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}
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// Chat 同步对话
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func (p *OpenAIProvider) Chat(ctx context.Context, messages []model.LLMMessage) (*model.LLMResponse, error) {
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resp, err := p.doChat(ctx, messages, p.config.Model, false)
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if err != nil {
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// 尝试fallback模型
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if p.config.FallbackModel != "" && p.config.FallbackModel != p.config.Model {
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log.Printf("[LLM] 主模型 %s 调用失败，降级到 %s: %v", p.config.Model, p.config.FallbackModel, err)
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return p.doChat(ctx, messages, p.config.FallbackModel, false)
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}
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return nil, err
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}
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return resp, nil
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}
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// ChatStream 流式对话
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func (p *OpenAIProvider) ChatStream(ctx context.Context, messages []model.LLMMessage) (<-chan StreamChunk, error) {
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ch := make(chan StreamChunk, 100)
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go func() {
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defer close(ch)
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resp, err := p.doChatStream(ctx, messages, p.config.Model)
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if err != nil {
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// Fallback
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if p.config.FallbackModel != "" {
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log.Printf("[LLM] 流式调用主模型失败，降级: %v", err)
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resp, err = p.doChatStream(ctx, messages, p.config.FallbackModel)
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}
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if err != nil {
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ch <- StreamChunk{Error: err, Done: true}
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return
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}
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}
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defer resp.Body.Close()
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scanner := bufio.NewScanner(resp.Body)
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// 增大scanner buffer以处理大块SSE数据
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scanner.Buffer(make([]byte, 0, 64*1024), 1024*1024)
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for scanner.Scan() {
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line := scanner.Text()
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// SSE格式: data: {...}
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if !strings.HasPrefix(line, "data: ") {
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continue
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}
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data := strings.TrimPrefix(line, "data: ")
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// 流结束标记
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if data == "[DONE]" {
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ch <- StreamChunk{Done: true}
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return
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}
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var streamResp openAIStreamResponse
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if err := json.Unmarshal([]byte(data), &streamResp); err != nil {
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continue
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}
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if len(streamResp.Choices) > 0 {
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delta := streamResp.Choices[0].Delta
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if delta.Content != "" {
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ch <- StreamChunk{Content: delta.Content}
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}
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if streamResp.Choices[0].FinishReason != "" {
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usage := &model.Usage{}
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if streamResp.Usage != nil {
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usage.PromptTokens = streamResp.Usage.PromptTokens
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usage.CompletionTokens = streamResp.Usage.CompletionTokens
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usage.TotalTokens = streamResp.Usage.TotalTokens
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}
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ch <- StreamChunk{Done: true, Usage: usage}
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return
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}
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}
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}
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if err := scanner.Err(); err != nil {
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ch <- StreamChunk{Error: fmt.Errorf("读取流式响应失败: %w", err), Done: true}
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return
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}
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ch <- StreamChunk{Done: true}
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}()
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return ch, nil
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}
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// openAIStreamResponse 流式响应结构
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type openAIStreamResponse struct {
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ID string `json:"id"`
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Object string `json:"object"`
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Choices []openAIStreamChoice `json:"choices"`
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Usage *openAIUsage `json:"usage,omitempty"`
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}
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type openAIStreamChoice struct {
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Index int `json:"index"`
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Delta openAIMessage `json:"delta"`
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FinishReason string `json:"finish_reason"`
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}
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// doChat 执行同步对话请求
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func (p *OpenAIProvider) doChat(ctx context.Context, messages []model.LLMMessage, model string, stream bool) (*model.LLMResponse, error) {
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// 转换消息格式
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oaiMessages := make([]openAIMessage, len(messages))
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for i, msg := range messages {
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oaiMessages[i] = openAIMessage{
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Role: string(msg.Role),
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Content: msg.Content,
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}
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}
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reqBody := openAIRequest{
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Model: model,
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Messages: oaiMessages,
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Temperature: 0.8,
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Stream: stream,
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}
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jsonBody, err := json.Marshal(reqBody)
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if err != nil {
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return nil, fmt.Errorf("序列化请求失败: %w", err)
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}
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req, err := http.NewRequestWithContext(ctx, "POST", p.config.BaseURL+"/chat/completions", bytes.NewReader(jsonBody))
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if err != nil {
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return nil, fmt.Errorf("创建请求失败: %w", err)
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}
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req.Header.Set("Content-Type", "application/json")
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req.Header.Set("Authorization", "Bearer "+p.config.APIKey)
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resp, err := p.httpClient.Do(req)
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if err != nil {
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return nil, fmt.Errorf("请求失败: %w", err)
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}
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defer resp.Body.Close()
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body, err := io.ReadAll(resp.Body)
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if err != nil {
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return nil, fmt.Errorf("读取响应失败: %w", err)
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}
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if resp.StatusCode != http.StatusOK {
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var errResp openAIResponse
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if json.Unmarshal(body, &errResp) == nil && errResp.Error != nil {
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return nil, fmt.Errorf("API错误 [%s]: %s", errResp.Error.Code, errResp.Error.Message)
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}
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return nil, fmt.Errorf("API返回状态码 %d: %s", resp.StatusCode, string(body))
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}
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var oaiResp openAIResponse
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if err := json.Unmarshal(body, &oaiResp); err != nil {
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return nil, fmt.Errorf("解析响应失败: %w", err)
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}
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if len(oaiResp.Choices) == 0 {
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return nil, fmt.Errorf("API返回空choices")
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}
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return &model.LLMResponse{
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Content: oaiResp.Choices[0].Message.Content,
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FinishReason: oaiResp.Choices[0].FinishReason,
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Usage: model.Usage{
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PromptTokens: oaiResp.Usage.PromptTokens,
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CompletionTokens: oaiResp.Usage.CompletionTokens,
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TotalTokens: oaiResp.Usage.TotalTokens,
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},
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}, nil
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}
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// doChatStream 执行流式对话请求（返回原始HTTP响应）
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func (p *OpenAIProvider) doChatStream(ctx context.Context, messages []model.LLMMessage, model string) (*http.Response, error) {
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oaiMessages := make([]openAIMessage, len(messages))
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for i, msg := range messages {
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oaiMessages[i] = openAIMessage{
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Role: string(msg.Role),
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Content: msg.Content,
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}
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}
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reqBody := openAIRequest{
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Model: model,
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Messages: oaiMessages,
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Temperature: 0.8,
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Stream: true,
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}
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jsonBody, err := json.Marshal(reqBody)
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if err != nil {
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return nil, fmt.Errorf("序列化请求失败: %w", err)
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}
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req, err := http.NewRequestWithContext(ctx, "POST", p.config.BaseURL+"/chat/completions", bytes.NewReader(jsonBody))
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if err != nil {
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return nil, fmt.Errorf("创建请求失败: %w", err)
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}
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req.Header.Set("Content-Type", "application/json")
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req.Header.Set("Authorization", "Bearer "+p.config.APIKey)
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req.Header.Set("Accept", "text/event-stream")
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resp, err := p.httpClient.Do(req)
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if err != nil {
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return nil, fmt.Errorf("请求失败: %w", err)
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}
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if resp.StatusCode != http.StatusOK {
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defer resp.Body.Close()
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body, _ := io.ReadAll(resp.Body)
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return nil, fmt.Errorf("API返回状态码 %d: %s", resp.StatusCode, string(body))
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}
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return resp, nil
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}
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// ModelName 返回模型名称
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func (p *OpenAIProvider) ModelName() string {
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return p.config.Model
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}
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