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redis.go
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redis.go
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package esrank
import (
"context"
"fmt"
"math"
"strconv"
"time"
goredislib "github.com/go-redis/redis/v8"
"github.com/go-redsync/redsync/v4"
"github.com/go-redsync/redsync/v4/redis/goredis/v8"
)
// TimeLayout time layout
const TimeLayout string = "2006-01-01"
// StartTimeDefault default start time
const StartTimeDefault string = "2020-01-01"
// RankingListNameSuffix the suffix of ranking list name
const RankingListNameSuffix string = "ranking"
// RankingNameDefault default ranking name
const RankingNameDefault string = "myRanking"
// TimeMode mode of time
type TimeMode int
const (
// TimeModeMicroSec time mode of micro sec
TimeModeMicroSec TimeMode = 0
// TimeModeMilliSec time mode of milli sec
TimeModeMilliSec TimeMode = 1
// TimeModeSec time mode of sec
TimeModeSec TimeMode = 2
)
// Ranking struct of ranking
type Ranking struct {
name string
mode TimeMode
startTime time.Time
client *goredislib.Client
rs *redsync.Redsync
}
// NewRanking constructor function
func NewRanking(cl *goredislib.Client, opts... Option) *Ranking {
r := new(Ranking)
r.client = cl
pool := goredis.NewPool(r.client)
r.rs = redsync.New(pool)
r.name = RankingNameDefault
r.mode = TimeModeMilliSec
r.startTime, _ = time.Parse(TimeLayout, StartTimeDefault)
// options
for _, opt := range opts {
r = opt(r)
}
return r
}
// AddRankingScore add score
func (r *Ranking) AddRankingScore(ctx context.Context, uid uint32, score float64) error {
// lock
mutex := r.rs.NewMutex(r.lockKey(uid), redsync.WithExpiry(time.Second))
for {
if lockErr := mutex.Lock(); lockErr == nil {
break
}
}
// Release the lock so other processes or threads can obtain a lock.
defer func() {
_, _ = mutex.Unlock()
}()
pKey := r.uidKey(uid)
oldKey, _ := r.getRankingKey(ctx, uid)
var oldScore float64
var err error
if oldKey != "" {
oldScore, err = r.client.ZScore(ctx,r.rankingListName(), oldKey).Result()
if err != nil {
return err
}
}
newKey := r.setRankingKey(uid)
mem := &goredislib.Z {
Score: score + oldScore,
Member: newKey,
}
err = r.client.ZAdd(ctx,r.rankingListName(), mem).Err()
if err != nil {
return err
}
if err = r.client.Set(ctx, pKey, newKey, 0).Err(); err != nil {
return err
}
if oldKey != "" && oldKey != newKey {
err = r.client.ZRem(ctx,r.rankingListName(), oldKey).Err()
if err != nil {
return err
}
}
return nil
}
// RankingList ranking list of uid a score sets
func (r *Ranking) RankingList(ctx context.Context, start, end int64) ([]map[uint32]float64, error) {
res, err := r.client.ZRevRangeWithScores(ctx,r.rankingListName(), start, end ).Result()
if err != nil {
return nil, err
}
list := make([]map[uint32]float64, 0, len(res))
for _, re := range res {
list = append(list, map[uint32]float64{getRankingUID(re.Member.(string)): re.Score})
}
return list, err
}
// GetRanking get personal rank and score
func (r *Ranking) GetRanking(ctx context.Context, uid uint32) (int64, float64, error) {
key, err := r.getRankingKey(ctx, uid)
if err != nil {
return 0, float64(0), err
}
if key == "" {
return 0, float64(0), nil
}
rank, err := r.client.ZRevRank(ctx, r.rankingListName(), key).Result()
if err != nil {
return 0, float64(0), err
}
score, err := r.client.ZScore(ctx, r.rankingListName(), key).Result()
return rank, score, err
}
// Remove remove personal ranking
func (r *Ranking) Remove(ctx context.Context, uid uint32) error {
key, err := r.getRankingKey(ctx, uid)
if err != nil {
return err
}
if key == "" {
return nil
}
err = r.client.Del(ctx, r.uidKey(uid)).Err()
if err != nil {
return err
}
return r.client.ZRem(ctx, r.rankingListName(), key).Err()
}
// RemoveAll remove all rankings
func (r *Ranking) RemoveAll(ctx context.Context) error {
name := r.rankingListName()
v, err := r.client.Exists(ctx, name).Result()
if err != nil || v == 0 {
return err
}
if err = r.client.Del(ctx, name).Err(); err != nil {
return err
}
keys, err := r.client.Keys(ctx, r.uidKeys()).Result()
if err != nil {
return err
}
return r.client.Del(ctx, keys...).Err()
}
func (r *Ranking) getUnixTimeStamp(t time.Time) int64 {
switch r.mode {
case TimeModeMicroSec:
return t.UnixNano()
case TimeModeMilliSec:
return t.UnixNano()/int64(time.Millisecond)
case TimeModeSec:
return t.Unix()
}
return 0
}
func (r *Ranking) setRankingKey(uid uint32) string {
timestamp := r.getUnixTimeStamp(time.Now()) // int64
t1 := uint64(timestamp) - uint64(r.getUnixTimeStamp(r.startTime))
t2 := uint64(^t1)
t3 := t2 << 32
v := t3 + uint64(uid)
return fmt.Sprintf("%v", v)
}
func getRankingUID(key string) uint32 {
keyNum, _ := strconv.ParseUint(key, 10, 64)
uidMax := uint64(math.MaxUint32) // 32bit max
return uint32(keyNum & uidMax)
}
func (r *Ranking) getRankingKey(ctx context.Context, uid uint32) (string, error) {
val, err := r.client.Exists(ctx, r.uidKey(uid)).Result()
if err != nil {
return "", err
}
if val == 0 {
return "", nil
}
return r.client.Get(ctx, r.uidKey(uid)).Result()
}
func (r *Ranking) lockKey(uid interface{}) string {
return fmt.Sprintf("esrank_%s_lock_%v", r.name, uid)
}
func (r *Ranking) uidKey(uid interface{}) string {
return fmt.Sprintf("esrank_%s_uid_%v", r.name, uid)
}
func (r *Ranking) uidKeys() string {
return fmt.Sprintf("esrank_%s_uid_*", r.name)
}
func (r *Ranking) rankingListName() string {
return fmt.Sprintf("esrank_%s_%s", r.name, RankingListNameSuffix)
}