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package idletracker
import (
"net"
"net/http"
"sync"
"time"
"github.com/sirupsen/logrus"
)
type IdleTracker struct {
http map[net.Conn]struct{}
hijacked int
total int
mux sync.Mutex
timer *time.Timer
Duration time.Duration
}
func NewIdleTracker(idle time.Duration) *IdleTracker {
return &IdleTracker{
http: make(map[net.Conn]struct{}),
Duration: idle,
timer: time.NewTimer(idle),
}
}
func (t *IdleTracker) ConnState(conn net.Conn, state http.ConnState) {
t.mux.Lock()
defer t.mux.Unlock()
oldActive := t.ActiveConnections()
logrus.Debugf("IdleTracker %p:%v %d/%d connection(s)", conn, state, oldActive, t.TotalConnections())
switch state {
case http.StateNew, http.StateActive:
t.http[conn] = struct{}{}
// stop the timer if we transitioned from idle
if oldActive == 0 {
t.timer.Stop()
}
t.total++
case http.StateHijacked:
// hijacked connections are handled elsewhere
delete(t.http, conn)
t.hijacked++
case http.StateIdle, http.StateClosed:
delete(t.http, conn)
// Restart the timer if we've become idle
if oldActive > 0 && len(t.http) == 0 {
t.timer.Stop()
t.timer.Reset(t.Duration)
}
}
}
func (t *IdleTracker) TrackHijackedClosed() {
t.mux.Lock()
defer t.mux.Unlock()
t.hijacked--
}
func (t *IdleTracker) ActiveConnections() int {
return len(t.http) + t.hijacked
}
func (t *IdleTracker) TotalConnections() int {
return t.total
}
func (t *IdleTracker) Done() <-chan time.Time {
return t.timer.C
}
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