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moby--moby/pkg/beam/service.go

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package beam
import (
"net"
)
// Listen is a convenience interface for applications to create service endpoints
// which can be easily used with existing networking code.
//
// Listen registers a new service endpoint on the beam connection `conn`, using the
// service name `name`. It returns a listener which can be used in the usual
// way. Calling Accept() on the listener will block until a new connection is available
// on the service endpoint. The endpoint is then returned as a regular net.Conn and
// can be used as a regular network connection.
//
// Note that if the underlying file descriptor received in attachment is nil or does
// not point to a connection, that message will be skipped.
//
func Listen(conn Sender, name string) (net.Listener, error) {
endpoint, err := SendConn(conn, []byte(name))
if err != nil {
return nil, err
}
return &listener{
name: name,
endpoint: endpoint,
}, nil
}
func Connect(ctx *UnixConn, name string) (net.Conn, error) {
l, err := Listen(ctx, name)
if err != nil {
return nil, err
}
conn, err := l.Accept()
if err != nil {
return nil, err
}
return conn, nil
}
type listener struct {
name string
endpoint ReceiveCloser
}
func (l *listener) Accept() (net.Conn, error) {
for {
_, f, err := l.endpoint.Receive()
if err != nil {
return nil, err
}
if f == nil {
// Skip empty attachments
continue
}
conn, err := net.FileConn(f)
if err != nil {
// Skip beam attachments which are not connections
// (for example might be a regular file, directory etc)
continue
}
return conn, nil
}
panic("impossibru!")
return nil, nil
}
func (l *listener) Close() error {
return l.endpoint.Close()
}
func (l *listener) Addr() net.Addr {
return addr(l.name)
}
type addr string
func (a addr) Network() string {
return "beam"
}
func (a addr) String() string {
return string(a)
}