add rnd pool

Author: markus621

.gitignore

@@ -1,23 +1,19 @@
-# If you prefer the allow list template instead of the deny list, see community template:
-# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
-#
-# Binaries for programs and plugins
+.tools/
+bin/
+vendor/
+build/
+.idea/
+.vscode/
+coverage.txt
+coverage.out
 *.exe
 *.exe~
 *.dll
 *.so
 *.dylib
-
-# Test binary, built with `go test -c`
+*.db
+*.db-journal
+*.mmdb
 *.test
-
-# Output of the go coverage tool, specifically when used with LiteIDE
 *.out
-
-# Dependency directories (remove the comment below to include it)
-# vendor/
-
-# Go workspace file
-go.work
-go.work.sum
-.tools/
+.env

Makefile

@@ -1,31 +1,28 @@
 
 .PHONY: install
 install:
-	go install github.com/osspkg/devtool@latest
-
-.PHONY: setup
-setup:
-	devtool setup-lib
+	go install go.osspkg.com/goppy/v2/cmd/goppy@latest
+	goppy setup-lib
 
 .PHONY: lint
 lint:
-	devtool lint
+	goppy lint
 
 .PHONY: license
 license:
-	devtool license
+	goppy license
 
 .PHONY: build
 build:
-	devtool build --arch=amd64
+	goppy build --arch=amd64
 
 .PHONY: tests
 tests:
-	devtool test
+	goppy test
 
 .PHONY: pre-commite
-pre-commite: setup lint build tests
+pre-commite: install lint tests build
 
 .PHONY: ci
-ci: install setup lint build tests
+ci: pre-commite
 

go.mod

@@ -1,3 +1,3 @@
 module go.osspkg.com/random
 
-go 1.21
+go 1.22.5

random.go

@@ -8,21 +8,35 @@ package random
 import (
 	crand "crypto/rand"
 	"math/rand"
+	"sync"
 	"time"
 )
 
-var rnd = rand.New(rand.NewSource(time.Now().UnixNano()))
-
 var (
 	digest = []byte("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-+=~*@#$%&?!<>")
+	pool   = sync.Pool{New: func() any {
+		return createRand()
+	}}
 )
 
+func createRand() *rand.Rand {
+	return rand.New(rand.NewSource(time.Now().UnixNano()))
+}
+
 func BytesOf(n int, src []byte) []byte {
+	rnd, ok := pool.Get().(*rand.Rand)
+	if !ok {
+		rnd = createRand()
+	}
+	defer pool.Put(rnd)
+
 	tmp := make([]byte, len(src))
 	copy(tmp, src)
+
 	rnd.Shuffle(len(tmp), func(i, j int) {
 		tmp[i], tmp[j] = tmp[j], tmp[i]
 	})
+
 	b := make([]byte, n)
 	for i := range b {
 		b[i] = tmp[rnd.Intn(len(tmp))]
@@ -43,6 +57,12 @@ func String(n int) string {
 }
 
 func Shuffle(v []string) []string {
+	rnd, ok := pool.Get().(*rand.Rand)
+	if !ok {
+		rnd = createRand()
+	}
+	defer pool.Put(rnd)
+
 	rnd.Shuffle(len(v), func(i, j int) { v[i], v[j] = v[j], v[i] })
 	return v
 }