// listenFD returns the specified socket activated files as a slice of
// net.Listeners or all of the activated files if "*" is given.
func listenFD(addr string, tlsConfig *tls.Config) ([]net.Listener, error) {
var (
err error
listeners []net.Listener
)
// socket activation
if tlsConfig != nil {
listeners, err = activation.TLSListeners(false, tlsConfig)
} else {
listeners, err = activation.Listeners(false)
}
if err != nil {
return nil, err
}
if len(listeners) == 0 {
return nil, fmt.Errorf("no sockets found via socket activation: make sure the service was started by systemd")
}
// default to all fds just like unix:// and tcp://
if addr == "" || addr == "*" {
return listeners, nil
}
fdNum, err := strconv.Atoi(addr)
if err != nil {
return nil, fmt.Errorf("failed to parse systemd fd address: should be a number: %v", addr)
}
fdOffset := fdNum - 3
if len(listeners) < int(fdOffset)+1 {
return nil, fmt.Errorf("too few socket activated files passed in by systemd")
}
if listeners[fdOffset] == nil {
return nil, fmt.Errorf("failed to listen on systemd activated file: fd %d", fdOffset+3)
}
for i, ls := range listeners {
if i == fdOffset || ls == nil {
continue
}
if err := ls.Close(); err != nil {
// TODO: We shouldn't log inside a library. Remove this or error out.
logrus.Errorf("failed to close systemd activated file: fd %d: %v", fdOffset+3, err)
}
}
return []net.Listener{listeners[fdOffset]}, nil
}
// listenFD returns the specified socket activated files as a slice of
// net.Listeners or all of the activated files if "*" is given.
func listenFD(addr string, tlsConfig *tls.Config) ([]net.Listener, error) {
var (
err error
listeners []net.Listener
)
// socket activation
if tlsConfig != nil {
listeners, err = systemdActivation.TLSListeners(false, tlsConfig)
} else {
listeners, err = systemdActivation.Listeners(false)
}
if err != nil {
return nil, err
}
if len(listeners) == 0 {
return nil, fmt.Errorf("No sockets found")
}
// default to all fds just like unix:// and tcp://
if addr == "" || addr == "*" {
return listeners, nil
}
fdNum, err := strconv.Atoi(addr)
if err != nil {
return nil, fmt.Errorf("failed to parse systemd address, should be number: %v", err)
}
fdOffset := fdNum - 3
if len(listeners) < int(fdOffset)+1 {
return nil, fmt.Errorf("Too few socket activated files passed in")
}
if listeners[fdOffset] == nil {
return nil, fmt.Errorf("failed to listen on systemd activated file at fd %d", fdOffset+3)
}
for i, ls := range listeners {
if i == fdOffset || ls == nil {
continue
}
if err := ls.Close(); err != nil {
logrus.Errorf("Failed to close systemd activated file at fd %d: %v", fdOffset+3, err)
}
}
return []net.Listener{listeners[fdOffset]}, nil
}