mirror of
https://github.com/containers/podman.git
synced 2025-06-12 19:14:36 +08:00
f03d470349
* Remove stutter naming for package and types * Stop treating StateIdle the same as StateClosed, rather transitions to StateIdle will keep API timeout window open * Remove redundate code Fixes #7826 Signed-off-by: Jhon Honce <jhonce@redhat.com>
97 lines
3.3 KiB
Go
97 lines
3.3 KiB
Go
package idle
|
|
|
|
import (
|
|
"net"
|
|
"net/http"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/sirupsen/logrus"
|
|
)
|
|
|
|
// Tracker holds the state for the server's idle tracking
|
|
type Tracker struct {
|
|
// Duration is the API idle window
|
|
Duration time.Duration
|
|
hijacked int // count of active connections managed by handlers
|
|
managed map[net.Conn]struct{} // set of active connections managed by http package
|
|
mux sync.Mutex // protect managed map
|
|
timer *time.Timer
|
|
total int // total number of connections made to this server instance
|
|
}
|
|
|
|
// NewTracker creates and initializes a new Tracker object
|
|
// For best behavior, duration should be 2x http idle connection timeout
|
|
func NewTracker(idle time.Duration) *Tracker {
|
|
return &Tracker{
|
|
managed: make(map[net.Conn]struct{}),
|
|
Duration: idle,
|
|
timer: time.NewTimer(idle),
|
|
}
|
|
}
|
|
|
|
// ConnState is called on HTTP connection state changes.
|
|
// - Once StateHijacked, StateClose is _NOT_ called on that connection
|
|
// - There are two "idle" timeouts, the http idle connection (not to be confused with the TCP/IP idle socket timeout)
|
|
// and the API idle window. The caller should set the http idle timeout to 2x the time provided to NewTacker() which
|
|
// is the API idle window.
|
|
func (t *Tracker) ConnState(conn net.Conn, state http.ConnState) {
|
|
t.mux.Lock()
|
|
defer t.mux.Unlock()
|
|
|
|
logrus.Debugf("IdleTracker %p:%v %dm+%dh/%dt connection(s)", conn, state, len(t.managed), t.hijacked, t.TotalConnections())
|
|
switch state {
|
|
case http.StateNew, http.StateActive:
|
|
// stop the API timer when the server transitions any connection to an "active" state
|
|
t.managed[conn] = struct{}{}
|
|
t.timer.Stop()
|
|
t.total++
|
|
case http.StateHijacked:
|
|
// hijacked connections should call Close() when finished.
|
|
// Note: If a handler hijack's a connection and then doesn't Close() it,
|
|
// the API timer will not fire and the server will _NOT_ timeout.
|
|
delete(t.managed, conn)
|
|
t.hijacked++
|
|
case http.StateIdle:
|
|
// When any connection goes into the http idle state, we know:
|
|
// - we have an active connection
|
|
// - the API timer should not be counting down (See case StateNew/StateActive)
|
|
break
|
|
case http.StateClosed:
|
|
oldActive := t.ActiveConnections()
|
|
|
|
// Either the server or a hijacking handler has closed the http connection to a client
|
|
if _, found := t.managed[conn]; found {
|
|
delete(t.managed, conn)
|
|
} else {
|
|
t.hijacked-- // guarded by t.mux above
|
|
}
|
|
|
|
// Transitioned from any "active" connection to no connections
|
|
if oldActive > 0 && t.ActiveConnections() == 0 {
|
|
t.timer.Stop() // See library source for Reset() issues and why they are not fixed
|
|
t.timer.Reset(t.Duration) // Restart the API window timer
|
|
}
|
|
}
|
|
}
|
|
|
|
// Close is used to update Tracker that a StateHijacked connection has been closed by handler (StateClosed)
|
|
func (t *Tracker) Close() {
|
|
t.ConnState(nil, http.StateClosed)
|
|
}
|
|
|
|
// ActiveConnections returns the number of current managed or StateHijacked connections
|
|
func (t *Tracker) ActiveConnections() int {
|
|
return len(t.managed) + t.hijacked
|
|
}
|
|
|
|
// TotalConnections returns total number of connections made to this instance of the service
|
|
func (t *Tracker) TotalConnections() int {
|
|
return t.total
|
|
}
|
|
|
|
// Done is called when idle timer has expired
|
|
func (t *Tracker) Done() <-chan time.Time {
|
|
return t.timer.C
|
|
}
|