52 lines
1.1 KiB
Go
52 lines
1.1 KiB
Go
package timeid
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import (
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"math"
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"time"
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)
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/* (1) Generates the current time id
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*
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* @wsize<float64> Window Size in seconds
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*
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* @return id<uint32> Current time id
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* @return parity<uint32> Current time parity
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*
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---------------------------------------------------------*/
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func Generate(wsize float64) (uint32, uint32) {
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/* (1) If wsize is 0 (div by zero possible error) */
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if wsize == 0 {
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return 0, 0
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}
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/* (2) Get current timestamp */
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timestamp := float64(time.Now().Unix())
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/* (3) Calculate the time id */
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var id = uint32(timestamp / wsize)
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/* (4) Calculate parity */
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var parity = id % 2
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return id, parity
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}
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/* (2) Try to guess a previous time id from its parity
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*
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* @wsize<float64> Window Size in seconds
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* @parity<uint32> Received parity
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*
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* @return id<uint32> The guessed time id
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*
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---------------------------------------------------------*/
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func Guess(wsize float64, parity uint32) uint32 {
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/* (1) Get current time id */
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var idNow, parityNow = Generate(wsize)
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/* (2) Update ID with tidNow parity difference */
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return idNow - uint32(math.Abs(float64(parityNow)-float64(parity)))
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}
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