func (c *Client) MonitorHealth(url string) {
dt := defaults.Duration(c.CheckPeriod, 10*time.Second)
c.tick = PeriodicFunc(Every(dt), func() {
c.HealthCheck(url)
})
}
// Close gracefully shutdowns the HTTP server.
func (s *Server) Close() (err error) {
if !atomic.CompareAndSwapInt64(&s.ready, 1, 0) {
return
}
// close active connections
s.Server.SetKeepAlivesEnabled(false)
// close the listen socket (ignore any errors)
s.listen.Close()
// close idle connections
s.mu.Lock()
for conn, state := range s.conns {
if state == http.StateIdle || state == http.StateNew {
conn.Close()
}
}
s.mu.Unlock()
// wait for all connections to be closed
done := make(chan struct{})
go func() {
s.wg.Wait()
// we're now safe to close the handler
if closer, ok := s.Handler.(io.Closer); ok {
err = closer.Close()
}
close(done)
}()
// make sure we timeout
timeout := defaults.Duration(s.Timeout, time.Minute)
select {
case <-done:
case <-time.After(timeout):
err = fmt.Errorf("timeout closing after %v", timeout)
}
close(s.tick)
return
}