基本能力编写完成

internal/cache/key.go

@@ -0,0 +1,44 @@
+package cache
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+
+	"github.com/gitcodestatic/gitcodestatic/internal/models"
+)
+
+// GenerateCacheKey 生成缓存键
+func GenerateCacheKey(repoID int64, branch string, constraint *models.StatsConstraint, commitHash string) string {
+	var constraintStr string
+	
+	if constraint != nil {
+		if constraint.Type == models.ConstraintTypeDateRange {
+			constraintStr = fmt.Sprintf("dr_%s_%s", constraint.From, constraint.To)
+		} else if constraint.Type == models.ConstraintTypeCommitLimit {
+			constraintStr = fmt.Sprintf("cl_%d", constraint.Limit)
+		}
+	}
+
+	data := fmt.Sprintf("repo:%d|branch:%s|constraint:%s|commit:%s",
+		repoID, branch, constraintStr, commitHash)
+
+	hash := sha256.Sum256([]byte(data))
+	return hex.EncodeToString(hash[:])
+}
+
+// SerializeConstraint 序列化约束为JSON字符串
+func SerializeConstraint(constraint *models.StatsConstraint) string {
+	if constraint == nil {
+		return "{}"
+	}
+
+	if constraint.Type == models.ConstraintTypeDateRange {
+		return fmt.Sprintf(`{"type":"date_range","from":"%s","to":"%s"}`,
+			constraint.From, constraint.To)
+	} else if constraint.Type == models.ConstraintTypeCommitLimit {
+		return fmt.Sprintf(`{"type":"commit_limit","limit":%d}`, constraint.Limit)
+	}
+
+	return "{}"
+}