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Code Issues Releases Activity

format time header 5% faster than before

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This commit is contained in:
JessonChan 2016-03-30 14:31:28 +08:00
parent 8e82ed319b
commit 99436a75b1
1 changed files with 29 additions and 28 deletions
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57
logs/logger.go
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@ -36,43 +36,44 @@ func (lg *logWriter) println(when time.Time, msg string) {
lg.Unlock() lg.Unlock()
} }
const y1 = `0000000000111111111122222222223333333333444444444455555555556666666666777777777788888888889999999999`
const y2 = `0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789`
const mo1 = `000000000111`
const mo2 = `123456789012`
const d1 = `0000000001111111111222222222233`
const d2 = `1234567890123456789012345678901`
const h1 = `000000000011111111112222`
const h2 = `012345678901234567890123`
const mi1 = `000000000011111111112222222222333333333344444444445555555555`
const mi2 = `012345678901234567890123456789012345678901234567890123456789`
const s1 = `000000000011111111112222222222333333333344444444445555555555`
const s2 = `012345678901234567890123456789012345678901234567890123456789`
func formatTimeHeader(when time.Time) ([]byte, int) { func formatTimeHeader(when time.Time) ([]byte, int) {
y, mo, d := when.Date() y, mo, d := when.Date()
h, mi, s := when.Clock() h, mi, s := when.Clock()
//len(2006/01/02 15:03:04)==19 //len("2006/01/02 15:03:04 ")==20
var buf [20]byte var buf [20]byte
t := 3
for y >= 10 { buf[0] = '2'
p := y / 10 buf[1] = '0'
buf[t] = byte('0' + y - p*10) buf[2] = y1[y-2000]
y = p buf[3] = y2[y-2000]
t--
}
buf[0] = byte('0' + y)
buf[4] = '/' buf[4] = '/'
if mo > 9 { buf[5] = mo1[mo]
buf[5] = '1' buf[6] = mo2[mo]
buf[6] = byte('0' + mo - 9)
} else {
buf[5] = '0'
buf[6] = byte('0' + mo)
}
buf[7] = '/' buf[7] = '/'
t = d / 10 buf[8] = d1[d]
buf[8] = byte('0' + t) buf[9] = d2[d]
buf[9] = byte('0' + d - t*10)
buf[10] = ' ' buf[10] = ' '
t = h / 10 buf[11] = h1[h]
buf[11] = byte('0' + t) buf[12] = h2[h]
buf[12] = byte('0' + h - t*10)
buf[13] = ':' buf[13] = ':'
t = mi / 10 buf[14] = mi1[mi]
buf[14] = byte('0' + t) buf[15] = mi2[mi]
buf[15] = byte('0' + mi - t*10)
buf[16] = ':' buf[16] = ':'
t = s / 10 buf[17] = s1[s]
buf[17] = byte('0' + t) buf[18] = s2[s]
buf[18] = byte('0' + s - t*10)
buf[19] = ' ' buf[19] = ' '
return buf[0:], d return buf[0:], d