真随机

comm/core.go

@@ -2,10 +2,10 @@ package comm
 
 import (
 	"context"
-	"math/rand"
-
+	"crypto/rand"
 	"fmt"
 	"go_dreamfactory/pb"
+	"math/big"
 	"reflect"
 	"strings"
 
@@ -93,15 +93,16 @@ func ProtoMarshal(rsp proto.Message, msg *pb.UserMessage) (ok bool) {
 /// 参数 权重数组 返回值 数组下标
 func GetRandW(sz []int32) int32 {
 	if len(sz) > 0 {
-		var _totalW int32 // 总权重
-		var _tmpW int32   // 临时权重
+		var _totalW int64 // 总权重
+		var _tmpW int64   // 临时权重
 		for _, v := range sz {
-			_totalW += v
+			_totalW += int64(v)
 		}
 		// 随机权重
+		n, _ := rand.Int(rand.Reader, big.NewInt(_totalW))
 		for i, v := range sz {
-			_tmpW += v
-			if rand.Int31n(_totalW) < _tmpW {
+			_tmpW += int64(v)
+			if n.Int64() < _tmpW {
 				return int32(i)
 			}
 		}
@@ -117,7 +118,8 @@ func GetRandNum(min, max int32) int32 {
 		return min
 	}
 
-	return rand.Int31n(int32(max-min+1)) + min
+	n, _ := rand.Int(rand.Reader, big.NewInt(int64(max-min+1))) //+1 是因为 rand方法范围是[0, max)
+	return int32(n.Int64()) + min
 }
 
 ///通过uid获取用户所在区服