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在游戏中排行榜是很常见的需求,之前一直使用的是redis的sortedset,刚好看到一个lua的实现,于是就移植到golang版本,github地址:https://github.com/Skycrab/go-zset,使用方法和redis 的cli命令基本一致。
使用了cgo封装,skiplist的实现基本和redis的一致,虽然cgo用起来很方便,但涉及到C中回调go时比较费事,
感觉还不如lua来得清爽。
go-zet并没有提供持久化的方法,我在https://github.com/Skycrab/cham/blob/master/lib/zset/zset.go中提供了持久化。主要是没有好的持久化方案,不像redis使用rdb格式。在cham中,和redis一样,fork后写文件,
只不过我使用的是json格式。
//use fork snapshot to save
func (z *zset) BgStore(name string) error {
f, err := helper.LockFile(name, true)
if err != nil {
return err
}
pid, errno := helper.Fork()
if errno != 0 {
return errors.New("fork error," + errno.Error())
}
//child
if pid == 0 {
buf := bufio.NewWriter(f)
encoder := json.NewEncoder(buf)
encoder.Encode(z.tbl)
buf.Flush()
f.Close()
os.Exit(0)
}
return nil
}
helper代码如下:
package helper
import (
"os"
"runtime"
"syscall"
)
func Fork() (int, syscall.Errno) {
r1, r2, err := syscall.RawSyscall(syscall.SYS_FORK, 0, 0, 0)
if err != 0 {
return 0, err
}
if runtime.GOOS == "darwin" && r2 == 1 {
r1 = 1
}
return int(r1), 0
}
// referer http://ikarishinjieva.github.io/blog/blog/2014/03/20/go-file-lock/
func LockFile(name string, truncate bool) (*os.File, error) {
flag := os.O_RDWR | os.O_CREATE
if truncate {
flag |= os.O_TRUNC
}
f, err := os.OpenFile(name, flag, 0666)
if err != nil {
return nil, err
}
if err := syscall.Flock(int(f.Fd()), syscall.LOCK_EX|syscall.LOCK_NB); err != nil {
f.Close()
return nil, err
}
return f, nil
}
看看test基本就知道用法了
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package zset
import (
"fmt"
"testing"
"time"
)
func equal(a []string, b []string) bool {
if len(a) != len(b) {
return false
}
for i := 0; i < len(a); i++ {
if a[i] != b[i] {
return false
}
}
return true
}
func assert(t *testing.T, ok bool, s string) {
if !ok {
t.Error(s)
}
}
func TestBase(t *testing.T) {
z := New()
assert(t, z.Count() == 0, "empty Count error")
z.Add(1, "12")
z.Add(1, "32")
assert(t, z.Count() == 2, "not empty Count error")
var score float64
var ex bool
score, ex = z.Score("12")
assert(t, score == 1, "Score error")
z.Add(2, "12")
assert(t, z.Count() == 2, "after add duplicate Count error")
score, ex = z.Score("12")
assert(t, score == 2, "after add Score error")
z.Rem("12")
assert(t, z.Count() == 1, "after rem Count error")
score, ex = z.Score("12")
assert(t, ex == false, "not exist Score error")
fmt.Println("")
}
func TestRangeByScore(t *testing.T) {
z := New()
z.Add(2, "22")
z.Add(1, "11")
z.Add(3, "33")
s := "TestRangeByScore error"
assert(t, equal(z.RangeByScore(2, 3), []string{"22", "33"}), s)
assert(t, equal(z.RangeByScore(0, 5), []string{"11", "22", "33"}), s)
assert(t, equal(z.RangeByScore(10, 5), []string{}), s)
assert(t, equal(z.RangeByScore(10, 0), []string{"33", "22", "11"}), s)
}
func TestRange(t *testing.T) {
z := New()
z.Add(100.1, "1")
z.Add(100.9, "9")
z.Add(100.5, "5")
assert(t, equal(z.Range(1, 3), []string{"1", "5", "9"}), "Range1 error")
assert(t, equal(z.Range(3, 1), []string{"9", "5", "1"}), "Range2 error")
assert(t, equal(z.RevRange(1, 2), []string{"9", "5"}), "RevRange1 error")
assert(t, equal(z.RevRange(3, 2), []string{"1", "5"}), "RevRange2 error")
}
func TestRank(t *testing.T) {
z := New()
assert(t, z.Rank("kehan") == 0, "Rank empty error")
z.Add(1111.1111, "kehan")
assert(t, z.Rank("kehan") == 1, "Rank error")
z.Add(222.2222, "lwy")
assert(t, z.Rank("kehan") == 2, "Rank 2 error")
assert(t, z.RevRank("kehan") == 1, "RevRank error")
}
func TestLimit(t *testing.T) {
z := New()
z.Add(1, "1")
z.Add(2, "2")
z.Add(3, "3")
z.Limit(1)
assert(t, z.Count() == 1, "Limit error")
assert(t, z.Rank("3") == 0, "Limit Rank error")
z.Add(4.4, "4")
z.Add(5.5, "5")
z.Add(0.5, "0.5")
z.Dump()
assert(t, z.RevLimit(4) == 0, "RevLimit error")
assert(t, z.RevLimit(0) == 4, "RevLimit2 error")
}
func TestStore(t *testing.T) {
z := New()
z.Add(1, "1")
z.Add(2, "2")
z.Add(3, "3")
z.BgStore("zdb.json")
go func() {
time.Sleep(time.Second * 2)
fmt.Println("continue add")
z.Add(4, "4")
z.Add(5, "5")
}()
}
func TestReStore(t *testing.T) {
z := New()
assert(t, len(z.tbl) == 0, "restore error")
z.ReStore("zdb.json")
fmt.Println(z.tbl)
assert(t, len(z.tbl) != 0, "restore2 error")
assert(t, z.Count() == len(z.tbl), "restore3 error")
}