28 lines
617 B
Go
28 lines
617 B
Go
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package store
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import (
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"crypto/rand"
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"sync"
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"time"
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"github.com/oklog/ulid/v2"
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)
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var (
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idMu sync.Mutex
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idEntropy = ulid.Monotonic(rand.Reader, 0)
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idLastMS uint64
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)
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// NewID returns a new ULID as its canonical 26-character string. IDs from
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// this process sort strictly in creation order, including within one
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// millisecond and across a backwards wall-clock step. It panics if the
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// monotonic entropy overflows within a millisecond.
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func NewID() string {
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idMu.Lock()
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defer idMu.Unlock()
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ms := max(ulid.Timestamp(time.Now()), idLastMS)
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idLastMS = ms
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return ulid.MustNew(ms, idEntropy).String()
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}
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