refactor(serial):唯一序列号生成器改进。
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徐涛
parent
bfb59a3626
commit
6bf4009338
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@ -100,6 +100,8 @@ func (pr _ParkRepository) CreatePark(ownerId string, park *model.Park) (bool, er
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defer cancel()
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timeNow := types.Now()
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serial.StringSerialRequestChan <- 1
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code := serial.Prefix("P", <-serial.StringSerialResponseChan)
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createSql, createArgs, _ := pr.ds.
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Insert("park").
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Cols(
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@ -108,7 +110,7 @@ func (pr _ParkRepository) CreatePark(ownerId string, park *model.Park) (bool, er
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"basic_pooled", "adjust_pooled", "loss_pooled", "public_pooled", "created_at", "last_modified_at",
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).
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Vals(goqu.Vals{
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serial.GeneratePrefixedUniqueSerialString("P"),
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code,
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ownerId, park.Name, tools.PinyinAbbr(park.Name),
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park.Area, park.TenementQuantity, park.Capacity, park.Category,
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park.MeterType, park.Region, park.Address, park.Contact, park.Phone, park.Enabled, park.PricePolicy, park.TaxRate,
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@ -347,13 +349,15 @@ func (pr _ParkRepository) CreateParkBuilding(pid, name string, floor *string) (b
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defer cancel()
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timeNow := types.Now()
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serial.StringSerialRequestChan <- 1
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code := serial.Prefix("B", <-serial.StringSerialResponseChan)
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createSql, createArgs, _ := pr.ds.
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Insert("park_building").
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Cols(
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"id", "park_id", "name", "floors", "enabled", "created_at", "last_modified_at",
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).
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Vals(goqu.Vals{
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serial.GeneratePrefixedUniqueSerialString("B"),
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code,
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pid, name, floor, true, timeNow, timeNow,
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}).
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Prepared(true).ToSQL()
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@ -134,7 +134,8 @@ func (us _UserService) CreateUserAccount(user *model.User, detail *model.UserDet
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} else {
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prefix = "S"
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}
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user.Id = serial.GeneratePrefixedUniqueSerialString(prefix)
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serial.StringSerialRequestChan <- 1
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user.Id = serial.Prefix(prefix, <-serial.StringSerialResponseChan)
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detail.Id = user.Id
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}
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verifyCode := tools.RandStr(10)
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@ -2,75 +2,83 @@ package serial
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import (
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"electricity_bill_calc/config"
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"electricity_bill_calc/global"
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"electricity_bill_calc/logger"
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"electricity_bill_calc/types"
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"fmt"
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"time"
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"github.com/rueian/rueidis"
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"github.com/samber/lo"
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"go.uber.org/zap"
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)
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var log = logger.Named("Algorithm", "Unique Serial")
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var (
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log = logger.Named("Algorithm", "Unique Serial")
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SerialRequestChan = make(chan int64, 500)
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StringSerialRequestChan = make(chan int64, 500)
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SerialResponseChan = make(chan int64, 500)
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StringSerialResponseChan = make(chan string, 500)
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)
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// 在防止服务器时间回拨的情况下，生成一个用于生成唯一编号的精简时间戳，该时间戳的起始时间为`2022-02-22 22:22:22.000000 +0800`，时间戳精确到秒。
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func generateTimestamp() int64 {
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func init() {
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go func() {
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var (
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lastTimestamp int64 = 0
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lastSerial int64 = 0
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)
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log.Info("唯一序列号生成服务已经启动。")
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for {
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select {
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case <-SerialRequestChan:
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log.Info("收到生成数字型唯一序列号的请求。")
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timestamp := generateTimestamp(lastTimestamp)
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if timestamp != lastTimestamp {
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lastSerial = 0
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}
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lastSerial := lastSerial + 1
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uniqueId := generateSerial(timestamp, lastSerial)
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SerialResponseChan <- uniqueId
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lastTimestamp = timestamp
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case <-StringSerialRequestChan:
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log.Info("收到生成字符串型唯一序列号的请求。")
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timestamp := generateTimestamp(lastTimestamp)
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if timestamp != lastTimestamp {
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lastSerial = 0
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}
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lastSerial := lastSerial + 1
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uniqueId := generateStringSerial(timestamp, lastSerial)
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StringSerialResponseChan <- uniqueId
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lastTimestamp = timestamp
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}
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}
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}()
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}
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// 生成一个能够对抗服务器时间回拨的时间戳
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func generateTimestamp(base int64) int64 {
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for {
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timestamp := types.Timestamp()
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cmds := make(rueidis.Commands, 0, 2)
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cmds = append(cmds, global.Rd.B().Set().Key("LAST_TIMESTAMP").Value(fmt.Sprintf("%d", timestamp)).Nx().ExSeconds(1).Build())
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cmds = append(cmds, global.Rd.B().Get().Key("LAST_TIMESTAMP").Build())
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results := global.Rd.DoMulti(global.Ctx, cmds...)
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store_res, err := lo.Last(results)
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if err != nil {
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log.Error("从Redis缓存中获取上一次的时间戳失败。", zap.Error(err))
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time.Sleep(1 * time.Second)
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continue
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}
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if stored_timestamp, err := store_res.AsInt64(); err == nil && timestamp >= stored_timestamp {
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if timestamp >= base {
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return timestamp
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} else {
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log.Error("转换从Redis缓存中获取的时间戳失败。", zap.Error(err))
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time.Sleep(1 * time.Second)
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continue
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}
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time.Sleep(1 * time.Second)
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}
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}
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// 生成一个基于精简改进的雪花算法的数字类型唯一编号。
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func GenerateUniqueSerial() int64 {
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for {
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timestamp := generateTimestamp()
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cmds := make(rueidis.Commands, 0, 2)
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cmds = append(cmds, global.Rd.B().Set().Key("SERIAL").Value(fmt.Sprintf("%d", 0)).Nx().ExSeconds(1).Build())
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cmds = append(cmds, global.Rd.B().Incr().Key("SERIAL").Build())
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results := global.Rd.DoMulti(global.Ctx, cmds...)
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store_res, err := lo.Last(results)
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if err != nil {
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log.Error("从Redis缓存中获取上一次的序列号失败。", zap.Error(err))
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time.Sleep(1 * time.Second)
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continue
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}
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if stored_serial, err := store_res.AsInt64(); err == nil {
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return (timestamp << 20) | ((config.ServiceSettings.HostSerial & 0xffff) << 16) | (stored_serial & 0xffff_ffff)
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} else {
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log.Error("转换从Redis缓存中获取的序列号失败。", zap.Error(err))
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time.Sleep(1 * time.Second)
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continue
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}
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// 生成一个唯一的数字型序列号
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func generateSerial(timestamp, serial int64) int64 {
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return (timestamp << 20) | ((config.ServiceSettings.HostSerial & 0xffff) << 16) | (serial & 0xffff_ffff)
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}
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// 生成一个唯一的字符串型序列号
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func generateStringSerial(timestamp, serial int64) string {
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return fmt.Sprintf("%017d", generateSerial(timestamp, serial))
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}
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// 生成一个带前缀字符串的唯一字符串型序列号
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func Prefix(prefix string, serial interface{}) string {
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switch serial := serial.(type) {
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case int64:
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return fmt.Sprintf("%s%017d", prefix, serial)
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case string:
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return fmt.Sprintf("%s%s", prefix, serial)
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}
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}
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// 生成一个基于精简改进的雪花算法的字符串类型唯一编号。
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func GenerateUniqueSerialString() string {
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uniqueId := GenerateUniqueSerial()
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return fmt.Sprintf("%d", uniqueId)
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}
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// 生成一个带有前缀的基于精简改进的雪花算法的字符串类型唯一编号。
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func GeneratePrefixedUniqueSerialString(prefix string) string {
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uniqueId := GenerateUniqueSerial()
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return fmt.Sprintf("%s%d", prefix, uniqueId)
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return ""
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}
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