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timestamp.go
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timestamp.go
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/*
Copyright © 2023 Thomas von Dein
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package common
import (
"regexp"
"strconv"
"time"
)
// https://gist.github.com/rhcarvalho/9338c3ff8850897c68bc74797c5dc25b
// Timestamp is like time.Time, but knows how to unmarshal from JSON
// Unix timestamp numbers or RFC3339 strings, and marshal back into
// the same JSON representation.
type Timestamp struct {
time.Time
rfc3339 bool
}
func (t Timestamp) MarshalJSON() ([]byte, error) {
if t.rfc3339 {
return t.Time.MarshalJSON()
}
return t.formatUnix()
}
func (t *Timestamp) UnmarshalJSON(data []byte) error {
err := t.Time.UnmarshalJSON(data)
if err != nil {
return t.parseUnix(data)
}
t.rfc3339 = true
return nil
}
func (t Timestamp) formatUnix() ([]byte, error) {
sec := float64(t.Time.UnixNano()) * float64(time.Nanosecond) / float64(time.Second)
return strconv.AppendFloat(nil, sec, 'f', -1, 64), nil
}
func (t *Timestamp) parseUnix(data []byte) error {
f, err := strconv.ParseFloat(string(data), 64)
if err != nil {
return err
}
t.Time = time.Unix(0, int64(f*float64(time.Second/time.Nanosecond)))
return nil
}
/*
We could use time.ParseDuration(), but this doesn't support days.
We could also use github.com/xhit/go-str2duration/v2, which does
the job, but it's just another dependency, just for this little
gem. And we don't need a time.Time value.
Convert a duration into seconds (int).
Valid time units are "s", "m", "h" and "d".
*/
func Duration2int(duration string) int {
re := regexp.MustCompile(`(\d+)([dhms])`)
seconds := 0
for _, match := range re.FindAllStringSubmatch(duration, -1) {
if len(match) == 3 {
v, _ := strconv.Atoi(match[1])
switch match[2][0] {
case 'd':
seconds += v * 86400
case 'h':
seconds += v * 3600
case 'm':
seconds += v * 60
case 's':
seconds += v
}
}
}
return seconds
}