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Wed, 15 Apr 2026 09:22:42 +0800

SingleFlight
macOS 奇怪的安全扫码机制
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SingleFlight

package analyzer

import (
 "context"
 "sync"

 "golang.org/x/sync/singleflight"
 "github.com/nathan/stock_bot/internal/storage"
)

type AnalysisService struct {
 genai *GenAIClient
 d1Client *storage.D1Client
 stockCache map[string]*StockAnalysisResult
 mu sync.RWMutex
 sf singleflight.Group
}

func (s *AnalysisService) analyzeStock(ctx context.Context, code, name string) (*StockAnalysisResult, error) {
 // 1. 第一層防護：檢查記憶體快取 (L1 Cache)
 s.mu.RLock()
 if result, ok := s.stockCache[code]; ok {
 s.mu.RUnlock()
 return result, nil
 }
 s.mu.RUnlock()

 // 2. 第二層防護：Singleflight (請求合併)
 key := "stock:" + code
 v, err, _ := s.sf.Do(key, func() (interface{}, error) {
 // 3. 執行昂貴的邏輯 (DB + Gemini API)
 result, err := s.doAnalyzeStock(ctx, code, name)
 if err != nil {
 return nil, err
 }

 // 4. 寫入快取 (務必在 singleflight 內部完成，防止下一波瞬間擊穿)
 s.mu.Lock()
 s.stockCache[code] = result
 s.mu.Unlock()

 return result, nil
 })

 if err != nil {
 return nil, err
 }
 return v.(*StockAnalysisResult), nil
}
func (s *AnalysisService) doAnalyzeStock(ctx context.Context, code, name string) (*StockAnalysisResult, error) {
 // 建立一個子 Context 用於內部的多個非同步任務
 g, ctx := errgroup.WithContext(ctx)

 var dbData string
 var aiResult string

 // 任務 1：查資料庫
 g.Go(func() error {
 // 隨時檢查 Context 是否已取消
 select {
 case <-ctx.Done():
 return ctx.Err()
 default:
 // 模擬資料庫查詢
 dbData = "Historical Data"
 return nil
 }
 })

 // 任務 2：呼叫 Gemini API
 g.Go(func() error {
 // 將 ctx 傳入 API 客戶端，讓它能跟隨整體的超時控制
 res, err := s.genai.Generate(ctx, "Analyze this: "+code)
 if err != nil {
 return err
 }
 aiResult = res
 return nil
 })

 // 等待所有任務完成或其中一個出錯
 if err := g.Wait(); err != nil {
 return nil, err
 }

 return &StockAnalysisResult{Data: dbData, Analysis: aiResult}, nil
}
func (s *AnalysisService) analyzeStockWithMetrics(ctx context.Context, code string) (*StockAnalysisResult, error) {
 key := "stock:" + code
 v, err, shared := s.sf.Do(key, func() (interface{}, error) {
 return s.doAnalyzeStock(ctx, code, "Name")
 })

 // 紀錄監控指標：分辨是「原始呼叫」還是「共享結果」
 status := "original"
 if shared {
 status = "shared"
 }

 s.sfCounter.Add(ctx, 1, metric.WithAttributes(
 attribute.String("stock_code", code),
 attribute.String("type", status),
 ))

 if err != nil {
 return nil, err
 }
 return v.(*StockAnalysisResult), nil
}

macOS 奇怪的安全扫码机制

# 查看最近的 syspolicyd 扫描记录
log show --predicate 'subsystem == "com.apple.syspolicy.exec"' --last 5m --style compact | grep performScan

System Settings → Privacy & Security → Full Disk Access，给 VS Code 完全磁盘访问权限有效

Taiwan on Ricky

Articles

SingleFlight

macOS 奇怪的安全扫码机制