evdist: Retactor + include dashboard lookup

evdist/distlist.go

@@ -0,0 +1,124 @@
+package main
+
+import (
+	"log"
+	"sync"
+	"time"
+)
+
+type DistEvent interface {
+	GetId() int64
+	GetDate() *time.Time
+}
+
+// distList maintain a nextSettingsFile list up-to-date.
+type distList struct {
+	List  []DistEvent
+	Lock  sync.RWMutex
+	Timer *time.Timer
+}
+
+func (l *distList) TimerNextEvent() *time.Timer {
+	l.Lock.RLock()
+	defer l.Lock.RUnlock()
+
+	var min *time.Time
+
+	for _, f := range l.List {
+		if min == nil || f.GetDate().Before(*min) {
+			min = f.GetDate()
+		}
+	}
+
+	if min == nil {
+		return nil
+	}
+
+	return time.NewTimer(time.Until(*min))
+}
+
+func (l *distList) AddEvent(nsf DistEvent) {
+	l.Lock.Lock()
+
+	istop := len(l.List)
+	for i, n := range l.List {
+		if n.GetId() == nsf.GetId() {
+			l.Lock.Unlock()
+			return
+		} else if n.GetDate().After(*nsf.GetDate()) {
+			istop = i
+			break
+		}
+	}
+
+	l.List = append(l.List, nsf)
+	copy(l.List[istop+1:], l.List[istop:])
+	l.List[istop] = nsf
+
+	l.Lock.Unlock()
+
+	if istop == 0 {
+		l.ResetTimer()
+	}
+}
+
+func (l *distList) DelEvent(id int64) {
+	l.Lock.Lock()
+
+	istop := len(l.List)
+	for i, n := range l.List {
+		if n.GetId() == id {
+			istop = i
+			break
+		}
+	}
+
+	if istop == len(l.List)-1 {
+		l.List = l.List[:istop]
+	} else if istop != len(l.List) {
+		l.List = append(l.List[:istop], l.List[istop+1:]...)
+	}
+
+	l.Lock.Unlock()
+
+	if istop == 0 {
+		l.ResetTimer()
+	}
+}
+
+func (l *distList) ResetTimer() {
+	l.Lock.RLock()
+	defer l.Lock.RUnlock()
+
+	if len(l.List) == 0 {
+		l.Timer.Reset(time.Minute)
+	} else {
+		l.Timer.Reset(time.Until(*l.List[0].GetDate()))
+	}
+}
+
+func (l *distList) Pop() DistEvent {
+	l.Lock.Lock()
+	defer l.Lock.Unlock()
+
+	if len(l.List) == 0 {
+		return nil
+	}
+
+	if time.Now().Before(*l.List[0].GetDate()) {
+		return nil
+	}
+
+	ret := l.List[0]
+	l.List = l.List[1:]
+	return ret
+}
+
+func (l *distList) Print() {
+	l.Lock.RLock()
+	defer l.Lock.RUnlock()
+
+	for n, i := range l.List {
+		log.Printf("#%d: %v", n, i)
+	}
+}