chore: use fastrand to replace math/rand

transport/tuic/client.go

@@ -6,19 +6,19 @@ import (
 	"context"
 	"crypto/tls"
 	"errors"
-	"math/rand"
 	"net"
 	"runtime"
 	"sync"
 	"sync/atomic"
 	"time"
 
-	"github.com/metacubex/quic-go"
-
 	N "github.com/Dreamacro/clash/common/net"
 	"github.com/Dreamacro/clash/common/pool"
 	C "github.com/Dreamacro/clash/constant"
 	"github.com/Dreamacro/clash/log"
+
+	"github.com/metacubex/quic-go"
+	"github.com/zhangyunhao116/fastrand"
 )
 
 var (
@@ -352,7 +352,7 @@ func (t *clientImpl) ListenPacketWithDialer(ctx context.Context, metadata *C.Met
 	pipe1, pipe2 := net.Pipe()
 	var connId uint32
 	for {
-		connId = rand.Uint32()
+		connId = fastrand.Uint32()
 		_, loaded := t.udpInputMap.LoadOrStore(connId, pipe1)
 		if !loaded {
 			break

transport/tuic/congestion/bbr_sender.go

@@ -5,11 +5,11 @@ package congestion
 import (
 	"fmt"
 	"math"
-	"math/rand"
 	"net"
 	"time"
 
 	"github.com/metacubex/quic-go/congestion"
+	"github.com/zhangyunhao116/fastrand"
 )
 
 const (
@@ -780,7 +780,7 @@ func (b *bbrSender) EnterProbeBandwidthMode(now time.Time) {
 	// Pick a random offset for the gain cycle out of {0, 2..7} range. 1 is
 	// excluded because in that case increased gain and decreased gain would not
 	// follow each other.
-	b.cycleCurrentOffset = rand.Int() % (GainCycleLength - 1)
+	b.cycleCurrentOffset = fastrand.Int() % (GainCycleLength - 1)
 	if b.cycleCurrentOffset >= 1 {
 		b.cycleCurrentOffset += 1
 	}