20 lines
616 B
Go
20 lines
616 B
Go
package flakeid
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const (
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SEQ_ID_SIZE = 8
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SHARD_ID_SIZE = 16
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TIMESTAMP_SIZE = 64 - SEQ_ID_SIZE - SHARD_ID_SIZE
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SEQ_ID_MAX = 1<<SEQ_ID_SIZE - 1
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TIMESTAMP_MAX = 1<<TIMESTAMP_SIZE - 1 // 30 years from EPOCH date
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TIMESTAMP_SHIFT = SEQ_ID_SIZE + SHARD_ID_SIZE
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SHARD_ID_SHIFT = SEQ_ID_SIZE
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EPOCH = 1550000000000 // Tue Feb 12 2019 19:33:20 GMT+0000
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)
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func compose(timestamp uint64, shardID uint16, seqID byte) uint64 {
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return (timestamp << TIMESTAMP_SHIFT) | (uint64(shardID) << SHARD_ID_SHIFT) | uint64(seqID)
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}
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func extractTimestamp(id uint64) uint64 {
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return id >> TIMESTAMP_SHIFT
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}
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