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fix: uuid v7 monotonicity in rare case #174

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fix: uuid v7 monotonicity in rare case #174

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13 changes: 10 additions & 3 deletions version7.go
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Original file line number Diff line number Diff line change
Expand Up @@ -95,9 +95,16 @@ func getV7Time() (milli, seq int64) {
seq = (nano - milli*nanoPerMilli) >> 8
now := milli<<12 + seq
if now <= lastV7time {
now = lastV7time + 1
milli = now >> 12
seq = now & 0xfff
// uuid ver bits may eat seq carry
if seq == 0xfff {
milli = milli + 1
seq = 0
now = milli<<12 + seq
} else {
now = lastV7time + 1
milli = now >> 12
seq = now & 0xfff
}
}
lastV7time = now
return milli, seq
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