43 lines
1.1 KiB
Go
43 lines
1.1 KiB
Go
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package controlapi
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import (
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"crypto/rand"
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"encoding/hex"
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"errors"
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"math/big"
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"time"
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)
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const crockford = "0123456789ABCDEFGHJKMNPQRSTVWXYZ"
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func newULID(prefix string, now time.Time) (string, error) {
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value := make([]byte, 16)
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milliseconds := uint64(now.UTC().UnixMilli())
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value[0] = byte(milliseconds >> 40)
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value[1] = byte(milliseconds >> 32)
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value[2] = byte(milliseconds >> 24)
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value[3] = byte(milliseconds >> 16)
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value[4] = byte(milliseconds >> 8)
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value[5] = byte(milliseconds)
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if _, err := rand.Read(value[6:]); err != nil {
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return "", errors.New("generate identifier randomness")
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}
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number := new(big.Int).SetBytes(value)
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base := big.NewInt(32)
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remainder := new(big.Int)
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encoded := make([]byte, 26)
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for index := len(encoded) - 1; index >= 0; index-- {
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number.QuoRem(number, base, remainder)
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encoded[index] = crockford[remainder.Int64()]
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}
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return prefix + string(encoded), nil
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}
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func newTraceID() (string, error) {
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value := make([]byte, 16)
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if _, err := rand.Read(value); err != nil {
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return "", errors.New("generate trace identifier")
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}
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return "trace_" + hex.EncodeToString(value), nil
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}
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