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Support generating id with custom time. #45

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Support generating id with custom time. #45

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10 changes: 7 additions & 3 deletions sonyflake.go
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Original file line number Diff line number Diff line change
Expand Up @@ -89,12 +89,16 @@ func NewSonyflake(st Settings) *Sonyflake {
// NextID generates a next unique ID.
// After the Sonyflake time overflows, NextID returns an error.
func (sf *Sonyflake) NextID() (uint64, error) {
return sf.NextIDWithCustomNow(time.Now())
}

func (sf *Sonyflake) NextIDWithCustomNow(now time.Time) (uint64, error) {
const maskSequence = uint16(1<<BitLenSequence - 1)

sf.mutex.Lock()
defer sf.mutex.Unlock()

current := currentElapsedTime(sf.startTime)
current := currentElapsedTime(now, sf.startTime)
if sf.elapsedTime < current {
sf.elapsedTime = current
sf.sequence = 0
Expand All @@ -116,8 +120,8 @@ func toSonyflakeTime(t time.Time) int64 {
return t.UTC().UnixNano() / sonyflakeTimeUnit
}

func currentElapsedTime(startTime int64) int64 {
return toSonyflakeTime(time.Now()) - startTime
func currentElapsedTime(now time.Time, startTime int64) int64 {
return toSonyflakeTime(now) - startTime
}

func sleepTime(overtime int64) time.Duration {
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