125 lines
2.3 KiB
Go
125 lines
2.3 KiB
Go
package monitor
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import (
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"bytes"
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"encoding/gob"
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"local/rssmon3/config"
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"log"
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"time"
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"github.com/golang-collections/go-datastructures/queue"
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)
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type Item struct {
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Key string
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}
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const nsLast = "nsLast"
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const nsInterval = "nsInterval"
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var never = time.Date(2999, time.January, 1, 1, 1, 1, 1, time.UTC)
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var forever = time.Duration(time.Hour * 99999)
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func NewItem(key string, interval time.Duration) (*Item, error) {
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i := &Item{
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Key: key,
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}
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if err := i.setInterval(interval); err != nil {
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return nil, err
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}
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if err := i.setLast(time.Now().Add(-2 * interval)); err != nil {
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return nil, err
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}
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return &Item{
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Key: key,
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}, nil
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}
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func (i *Item) Compare(other queue.Item) int {
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j := other.(*Item)
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iNext := i.Last().Add(i.Interval())
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jNext := j.Last().Add(j.Interval())
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if iNext.Before(jNext) {
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return 1
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} else if jNext.Before(iNext) {
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return -1
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} else {
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return 0
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}
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}
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func (i *Item) Interval() time.Duration {
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t, err := i.getInterval()
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if err != nil {
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log.Println(err)
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return forever
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}
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return t
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}
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func (i *Item) getInterval() (time.Duration, error) {
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t := time.Duration(0)
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b, err := config.Values().DB.Get(i.Key, nsInterval)
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if err != nil {
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return forever, err
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}
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buff := bytes.NewBuffer(b)
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dec := gob.NewDecoder(buff)
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err = dec.Decode(&t)
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return t, err
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}
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func (i *Item) setInterval(t time.Duration) error {
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buff := bytes.NewBuffer(nil)
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enc := gob.NewEncoder(buff)
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if err := enc.Encode(t); err != nil {
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return err
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}
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if err := config.Values().DB.Set(i.Key, buff.Bytes(), nsInterval); err != nil {
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return err
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}
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return nil
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}
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func (i *Item) Last() time.Time {
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t, err := i.getLast()
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if err != nil {
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log.Println(err)
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}
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return t
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}
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func (i *Item) Mark() {
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if err := i.setLast(time.Now()); err != nil {
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log.Println(err)
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}
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}
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func (i *Item) setLast(t time.Time) error {
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buff := bytes.NewBuffer(nil)
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enc := gob.NewEncoder(buff)
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if err := enc.Encode(t); err != nil {
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return err
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}
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if err := config.Values().DB.Set(i.Key, buff.Bytes(), nsLast); err != nil {
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return err
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}
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return nil
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}
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func (i *Item) getLast() (time.Time, error) {
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t := time.Now()
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b, err := config.Values().DB.Get(i.Key, nsLast)
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if err != nil {
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return never, err
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}
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buff := bytes.NewBuffer(b)
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dec := gob.NewDecoder(buff)
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if err := dec.Decode(&t); err != nil {
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return never, err
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}
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return t, nil
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}
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