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|
package needle
import (
"fmt"
"strconv"
)
const (
// stored unit types
Empty byte = iota
Minute
Hour
Day
Week
Month
Year
)
type TTL struct {
Count byte
Unit byte
}
var EMPTY_TTL = &TTL{}
// translate a readable ttl to internal ttl
// Supports format example:
// 3m: 3 minutes
// 4h: 4 hours
// 5d: 5 days
// 6w: 6 weeks
// 7M: 7 months
// 8y: 8 years
func ReadTTL(ttlString string) (*TTL, error) {
if ttlString == "" {
return EMPTY_TTL, nil
}
ttlBytes := []byte(ttlString)
unitByte := ttlBytes[len(ttlBytes)-1]
countBytes := ttlBytes[0 : len(ttlBytes)-1]
if '0' <= unitByte && unitByte <= '9' {
countBytes = ttlBytes
unitByte = 'm'
}
count, err := strconv.Atoi(string(countBytes))
unit := toStoredByte(unitByte)
return fitTtlCount(count, unit), err
}
func fitTtlCount(count int, unit byte) *TTL {
seconds := ToSeconds(count, unit)
if seconds == 0 {
return EMPTY_TTL
}
if seconds%(3600*24*365) == 0 && seconds/(3600*24*365) < 256 {
return &TTL{Count: byte(seconds / (3600 * 24 * 365)), Unit: Year}
}
if seconds%(3600*24*30) == 0 && seconds/(3600*24*30) < 256 {
return &TTL{Count: byte(seconds / (3600 * 24 * 30)), Unit: Month}
}
if seconds%(3600*24*7) == 0 && seconds/(3600*24*7) < 256 {
return &TTL{Count: byte(seconds / (3600 * 24 * 7)), Unit: Week}
}
if seconds%(3600*24) == 0 && seconds/(3600*24) < 256 {
return &TTL{Count: byte(seconds / (3600 * 24)), Unit: Day}
}
if seconds%(3600) == 0 && seconds/(3600) < 256 {
return &TTL{Count: byte(seconds / (3600)), Unit: Hour}
}
if seconds/60 < 256 {
return &TTL{Count: byte(seconds / 60), Unit: Minute}
}
if seconds/(3600) < 256 {
return &TTL{Count: byte(seconds / (3600)), Unit: Hour}
}
if seconds/(3600*24) < 256 {
return &TTL{Count: byte(seconds / (3600 * 24)), Unit: Day}
}
if seconds/(3600*24*7) < 256 {
return &TTL{Count: byte(seconds / (3600 * 24 * 7)), Unit: Week}
}
if seconds/(3600*24*30) < 256 {
return &TTL{Count: byte(seconds / (3600 * 24 * 30)), Unit: Month}
}
if seconds/(3600*24*365) < 256 {
return &TTL{Count: byte(seconds / (3600 * 24 * 365)), Unit: Year}
}
return EMPTY_TTL
}
// read stored bytes to a ttl
func LoadTTLFromBytes(input []byte) (t *TTL) {
if input[0] == 0 && input[1] == 0 {
return EMPTY_TTL
}
return &TTL{Count: input[0], Unit: input[1]}
}
// read stored bytes to a ttl
func LoadTTLFromUint32(ttl uint32) (t *TTL) {
input := make([]byte, 2)
input[1] = byte(ttl)
input[0] = byte(ttl >> 8)
return LoadTTLFromBytes(input)
}
// save stored bytes to an output with 2 bytes
func (t *TTL) ToBytes(output []byte) {
output[0] = t.Count
output[1] = t.Unit
}
func (t *TTL) ToUint32() (output uint32) {
if t == nil || t.Count == 0 {
return 0
}
output = uint32(t.Count) << 8
output += uint32(t.Unit)
return output
}
func (t *TTL) String() string {
if t == nil || t.Count == 0 {
return ""
}
if t.Unit == Empty {
return ""
}
countString := strconv.Itoa(int(t.Count))
switch t.Unit {
case Minute:
return countString + "m"
case Hour:
return countString + "h"
case Day:
return countString + "d"
case Week:
return countString + "w"
case Month:
return countString + "M"
case Year:
return countString + "y"
}
return ""
}
func (t *TTL) ToSeconds() uint64 {
return ToSeconds(int(t.Count), t.Unit)
}
func ToSeconds(count int, unit byte) uint64 {
switch unit {
case Empty:
return 0
case Minute:
return uint64(count) * 60
case Hour:
return uint64(count) * 60 * 60
case Day:
return uint64(count) * 60 * 24 * 60
case Week:
return uint64(count) * 60 * 24 * 7 * 60
case Month:
return uint64(count) * 60 * 24 * 30 * 60
case Year:
return uint64(count) * 60 * 24 * 365 * 60
}
return 0
}
func toStoredByte(readableUnitByte byte) byte {
switch readableUnitByte {
case 'm':
return Minute
case 'h':
return Hour
case 'd':
return Day
case 'w':
return Week
case 'M':
return Month
case 'y':
return Year
}
return 0
}
func (t TTL) Minutes() uint32 {
switch t.Unit {
case Empty:
return 0
case Minute:
return uint32(t.Count)
case Hour:
return uint32(t.Count) * 60
case Day:
return uint32(t.Count) * 60 * 24
case Week:
return uint32(t.Count) * 60 * 24 * 7
case Month:
return uint32(t.Count) * 60 * 24 * 30
case Year:
return uint32(t.Count) * 60 * 24 * 365
}
return 0
}
func SecondsToTTL(seconds int32) string {
if seconds == 0 {
return ""
}
if seconds%(3600*24*365) == 0 && seconds/(3600*24*365) < 256 {
return fmt.Sprintf("%dy", seconds/(3600*24*365))
}
if seconds%(3600*24*30) == 0 && seconds/(3600*24*30) < 256 {
return fmt.Sprintf("%dM", seconds/(3600*24*30))
}
if seconds%(3600*24*7) == 0 && seconds/(3600*24*7) < 256 {
return fmt.Sprintf("%dw", seconds/(3600*24*7))
}
if seconds%(3600*24) == 0 && seconds/(3600*24) < 256 {
return fmt.Sprintf("%dd", seconds/(3600*24))
}
if seconds%(3600) == 0 && seconds/(3600) < 256 {
return fmt.Sprintf("%dh", seconds/(3600))
}
if seconds/60 < 256 {
return fmt.Sprintf("%dm", seconds/60)
}
if seconds/(3600) < 256 {
return fmt.Sprintf("%dh", seconds/(3600))
}
if seconds/(3600*24) < 256 {
return fmt.Sprintf("%dd", seconds/(3600*24))
}
if seconds/(3600*24*7) < 256 {
return fmt.Sprintf("%dw", seconds/(3600*24*7))
}
if seconds/(3600*24*30) < 256 {
return fmt.Sprintf("%dM", seconds/(3600*24*30))
}
if seconds/(3600*24*365) < 256 {
return fmt.Sprintf("%dy", seconds/(3600*24*365))
}
return ""
}
|
