78 lines
2.1 KiB
Go
78 lines
2.1 KiB
Go
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package NumGen
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import (
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"math/big"
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"time"
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)
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// Internal function to generate the first part of the ID.
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func generateTimeID() (id int64) {
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//
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// Please have a look to the main documentation of this package,
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// if you are interested about how to calculate the parts.
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//
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// Using for all calculations big integers to get a precise result!
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bigResult := new(big.Int)
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bigBase := new(big.Int)
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bigNext := new(big.Int)
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bigBase.SetString("-9223372036854775808", 10)
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bigResult = bigBase
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t1 := time.Now().UTC()
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year := int64(t1.Year())
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month := int64(t1.Month())
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day := int64(t1.Day())
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hours := int64(t1.Hour())
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minutes := int64(t1.Minute())
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seconds := int64(t1.Second())
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milliseconds := int64(float64(t1.Nanosecond()) / 1000000.0)
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bigNext = big.NewInt(year)
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bigYear := new(big.Int)
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bigYear.SetString("1000000000000000", 10)
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bigYear = bigYear.Mul(bigYear, bigNext)
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bigResult = bigResult.Add(bigResult, bigYear)
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bigNext = big.NewInt(month)
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bigMonth := new(big.Int)
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bigMonth.SetString("10000000000000", 10)
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bigMonth = bigMonth.Mul(bigMonth, bigNext)
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bigResult = bigResult.Add(bigResult, bigMonth)
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bigNext = big.NewInt(day)
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bigDay := new(big.Int)
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bigDay.SetString("100000000000", 10)
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bigDay = bigDay.Mul(bigDay, bigNext)
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bigResult = bigResult.Add(bigResult, bigDay)
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bigNext = big.NewInt(hours)
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bigHours := new(big.Int)
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bigHours.SetString("1000000000", 10)
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bigHours = bigHours.Mul(bigHours, bigNext)
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bigResult = bigResult.Add(bigResult, bigHours)
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bigNext = big.NewInt(minutes)
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bigMinutes := new(big.Int)
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bigMinutes.SetString("10000000", 10)
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bigMinutes = bigMinutes.Mul(bigMinutes, bigNext)
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bigResult = bigResult.Add(bigResult, bigMinutes)
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bigNext = big.NewInt(seconds)
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bigSeconds := new(big.Int)
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bigSeconds.SetString("100000", 10)
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bigSeconds = bigSeconds.Mul(bigSeconds, bigNext)
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bigResult = bigResult.Add(bigResult, bigSeconds)
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bigNext = big.NewInt(milliseconds)
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bigMilliseconds := new(big.Int)
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bigMilliseconds.SetString("100", 10)
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bigMilliseconds = bigMilliseconds.Mul(bigMilliseconds, bigNext)
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bigResult = bigResult.Add(bigResult, bigMilliseconds)
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id = bigResult.Int64()
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return
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}
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