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https://github.com/jimeh/rands.git
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Jim Myhrberg
fe4308607c
The UUID v7 format is a time-ordered random UUID. It uses a timestamp with millisecond precision in the most significant bits, followed by random data. This provides both uniqueness and chronological ordering, making it ideal for database primary keys and situations where sorting by creation time is desired. References: - https://uuid7.com/ - https://www.ietf.org/archive/id/draft-peabody-dispatch-new-uuid-format-04.html#name-uuid-version-7
40 lines
739 B
Go
40 lines
739 B
Go
package uuid
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import (
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"regexp"
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"testing"
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"github.com/stretchr/testify/require"
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)
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func TestNewRandom(t *testing.T) {
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t.Parallel()
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m := regexp.MustCompile(
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`^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$`,
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)
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seen := make(map[string]struct{})
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for i := 0; i < 10000; i++ {
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got, err := NewRandom()
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require.NoError(t, err)
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require.Regexp(t, m, got.String())
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if _, ok := seen[got.String()]; ok {
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require.FailNow(t, "duplicate UUID")
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}
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seen[got.String()] = struct{}{}
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require.Equal(t, 4, int(got[6]>>4), "version is not 4")
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require.Equal(t, byte(0x80), got[8]&0xc0, "variant is not RFC 4122")
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}
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}
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func BenchmarkNewRandom(b *testing.B) {
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for n := 0; n < b.N; n++ {
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_, _ = NewRandom()
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}
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}
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