Reduce dependency chain

internal/hashtag/hashtag.go

@@ -3,7 +3,7 @@ package hashtag
 import (
 	"strings"
 
-	"golang.org/x/exp/rand"
+	"github.com/go-redis/redis/v8/internal/rand"
 )
 
 const slotNumber = 16384

internal/hashtag/hashtag_test.go

@@ -3,9 +3,10 @@ package hashtag
 import (
 	"testing"
 
+	"github.com/go-redis/redis/v8/internal/rand"
+
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
-	"golang.org/x/exp/rand"
 )
 
 func TestGinkgoSuite(t *testing.T) {
@@ -40,8 +41,8 @@ var _ = Describe("HashSlot", func() {
 			{"{}foo", 9500},
 			{"foo{}", 5542},
 			{"foo{}{bar}", 8363},
-			{"", 7404},
-			{"", 4403},
+			{"", 10503},
+			{"", 5176},
 			{string([]byte{83, 153, 134, 118, 229, 214, 244, 75, 140, 37, 215, 215}), 5463},
 		}
 		// Empty keys receive random slot.

internal/internal.go

@@ -3,7 +3,7 @@ package internal
 import (
 	"time"
 
-	"golang.org/x/exp/rand"
+	"github.com/go-redis/redis/v8/internal/rand"
 )
 
 func RetryBackoff(retry int, minBackoff, maxBackoff time.Duration) time.Duration {

internal/rand/rand.go

@@ -0,0 +1,45 @@
+package rand
+
+import (
+	"math/rand"
+	"sync"
+)
+
+// Int returns a non-negative pseudo-random int.
+func Int() int { return pseudo.Int() }
+
+// Intn returns, as an int, a non-negative pseudo-random number in [0,n).
+// It panics if n <= 0.
+func Intn(n int) int { return pseudo.Intn(n) }
+
+// Int63n returns, as an int64, a non-negative pseudo-random number in [0,n).
+// It panics if n <= 0.
+func Int63n(n int64) int64 { return pseudo.Int63n(n) }
+
+// Perm returns, as a slice of n ints, a pseudo-random permutation of the integers [0,n).
+func Perm(n int) []int { return pseudo.Perm(n) }
+
+// Seed uses the provided seed value to initialize the default Source to a
+// deterministic state. If Seed is not called, the generator behaves as if
+// seeded by Seed(1).
+func Seed(n int64) { pseudo.Seed(n) }
+
+var pseudo = rand.New(&source{src: rand.NewSource(1)})
+
+type source struct {
+	src rand.Source
+	mu  sync.Mutex
+}
+
+func (s *source) Int63() int64 {
+	s.mu.Lock()
+	n := s.src.Int63()
+	s.mu.Unlock()
+	return n
+}
+
+func (s *source) Seed(seed int64) {
+	s.mu.Lock()
+	s.src.Seed(seed)
+	s.mu.Unlock()
+}