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135 lines
2.3 KiB
135 lines
2.3 KiB
package needle
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import (
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"strconv"
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)
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const (
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//stored unit types
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Empty byte = iota
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Minute
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Hour
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Day
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Week
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Month
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Year
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)
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type TTL struct {
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Count byte
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Unit byte
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}
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var EMPTY_TTL = &TTL{}
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// translate a readable ttl to internal ttl
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// Supports format example:
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// 3m: 3 minutes
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// 4h: 4 hours
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// 5d: 5 days
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// 6w: 6 weeks
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// 7M: 7 months
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// 8y: 8 years
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func ReadTTL(ttlString string) (*TTL, error) {
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if ttlString == "" {
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return EMPTY_TTL, nil
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}
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ttlBytes := []byte(ttlString)
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unitByte := ttlBytes[len(ttlBytes)-1]
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countBytes := ttlBytes[0 : len(ttlBytes)-1]
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if '0' <= unitByte && unitByte <= '9' {
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countBytes = ttlBytes
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unitByte = 'm'
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}
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count, err := strconv.Atoi(string(countBytes))
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unit := toStoredByte(unitByte)
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return &TTL{Count: byte(count), Unit: unit}, err
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}
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// read stored bytes to a ttl
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func LoadTTLFromBytes(input []byte) (t *TTL) {
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return &TTL{Count: input[0], Unit: input[1]}
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}
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// read stored bytes to a ttl
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func LoadTTLFromUint32(ttl uint32) (t *TTL) {
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input := make([]byte, 2)
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input[1] = byte(ttl)
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input[0] = byte(ttl >> 8)
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return LoadTTLFromBytes(input)
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}
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// save stored bytes to an output with 2 bytes
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func (t *TTL) ToBytes(output []byte) {
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output[0] = t.Count
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output[1] = t.Unit
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}
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func (t *TTL) ToUint32() (output uint32) {
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output = uint32(t.Count) << 8
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output += uint32(t.Unit)
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return output
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}
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func (t *TTL) String() string {
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if t == nil || t.Count == 0 {
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return ""
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}
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if t.Unit == Empty {
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return ""
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}
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countString := strconv.Itoa(int(t.Count))
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switch t.Unit {
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case Minute:
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return countString + "m"
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case Hour:
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return countString + "h"
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case Day:
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return countString + "d"
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case Week:
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return countString + "w"
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case Month:
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return countString + "M"
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case Year:
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return countString + "y"
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}
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return ""
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}
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func toStoredByte(readableUnitByte byte) byte {
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switch readableUnitByte {
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case 'm':
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return Minute
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case 'h':
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return Hour
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case 'd':
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return Day
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case 'w':
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return Week
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case 'M':
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return Month
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case 'y':
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return Year
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}
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return 0
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}
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func (t TTL) Minutes() uint32 {
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switch t.Unit {
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case Empty:
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return 0
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case Minute:
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return uint32(t.Count)
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case Hour:
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return uint32(t.Count) * 60
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case Day:
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return uint32(t.Count) * 60 * 24
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case Week:
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return uint32(t.Count) * 60 * 24 * 7
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case Month:
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return uint32(t.Count) * 60 * 24 * 31
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case Year:
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return uint32(t.Count) * 60 * 24 * 365
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}
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return 0
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}
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