зеркало из https://github.com/microsoft/docker.git
Add socket activation for go apps
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
This commit is contained in:
Родитель
72ed2537b3
Коммит
cfb7711a74
|
@ -0,0 +1,61 @@
|
|||
/*
|
||||
Package to allow go applications to immediately start
|
||||
listening on a socket, unix, tcp, udp but hold connections
|
||||
until the application has booted and is ready to accept them
|
||||
*/
|
||||
package socketactivation
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"net"
|
||||
"time"
|
||||
)
|
||||
|
||||
// NewActivationListener returns a listener listening on addr with the protocol. It sets the
|
||||
// timeout to wait on first connection before an error is returned
|
||||
func NewActivationListener(proto, addr string, activate chan struct{}, timeout time.Duration) (net.Listener, error) {
|
||||
wrapped, err := net.Listen(proto, addr)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return &defaultListener{
|
||||
wrapped: wrapped,
|
||||
activate: activate,
|
||||
timeout: timeout,
|
||||
}, nil
|
||||
}
|
||||
|
||||
type defaultListener struct {
|
||||
wrapped net.Listener // the real listener to wrap
|
||||
ready bool // is the listner ready to start accpeting connections
|
||||
activate chan struct{}
|
||||
timeout time.Duration // how long to wait before we consider this an error
|
||||
}
|
||||
|
||||
func (l *defaultListener) Close() error {
|
||||
return l.wrapped.Close()
|
||||
}
|
||||
|
||||
func (l *defaultListener) Addr() net.Addr {
|
||||
return l.wrapped.Addr()
|
||||
}
|
||||
|
||||
func (l *defaultListener) Accept() (net.Conn, error) {
|
||||
// if the listen has been told it is ready then we can go ahead and
|
||||
// start returning connections
|
||||
if l.ready {
|
||||
return l.wrapped.Accept()
|
||||
}
|
||||
|
||||
select {
|
||||
case <-time.After(l.timeout):
|
||||
// close the connection so any clients are disconnected
|
||||
l.Close()
|
||||
return nil, fmt.Errorf("timeout (%s) reached waiting for listener to become ready", l.timeout.String())
|
||||
case <-l.activate:
|
||||
l.ready = true
|
||||
return l.Accept()
|
||||
}
|
||||
panic("unreachable")
|
||||
}
|
Загрузка…
Ссылка в новой задаче