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util/common/random.go

@@ -0,0 +1,18 @@
+package common
+
+import (
+	"crypto/rand"
+	"math/big"
+)
+
+// RandomInt 返回一个 0 .. max-1 之间的随机整数（使用 crypto/rand）
+func RandomInt(max int) int {
+	if max <= 0 {
+		return 0
+	}
+	n, err := rand.Int(rand.Reader, big.NewInt(int64(max)))
+	if err != nil {
+		return 0
+	}
+	return int(n.Int64())
+}