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ngo.go
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ngo.go
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// Gomatic nanomsg library
//
// This is experimental and might not work at all in practice.
package ngo
import (
"bytes"
"fmt"
"io"
"net"
"syscall"
"time"
nn "github.com/op/go-nanomsg"
)
type UnknownProtocolError string
func (e UnknownProtocolError) Error() string { return "unknown protocol " + string(e) }
func (e UnknownProtocolError) Temporary() bool { return false }
func (e UnknownProtocolError) Timeout() bool { return false }
type Dialer struct {
}
// Dial connects to the address using the given transport and protocol.
//
// Known protocols are "req", "rep", "pair".
func Dial(transport, protocol, address string) (net.Conn, error) {
var d Dialer
return d.Dial(transport, protocol, address)
}
func (d *Dialer) Dial(transport, protocol, address string) (net.Conn, error) {
// TODO support transport to be eg. tcp+srv?
// TODO rename transport to network and support the same convention as Go?
socket, err := newSocket(protocol)
if err != nil {
return nil, err
}
_, err = socket.Connect(fmt.Sprintf("%s://%s", transport, address))
return &conn{socket: socket, owner: true}, err
}
func newSocket(protocol string) (*nn.Socket, error) {
var proto nn.Protocol
switch protocol {
case "req":
proto = nn.REQ
case "rep":
proto = nn.REP
case "pair":
proto = nn.PAIR
default:
return nil, UnknownProtocolError(protocol)
}
return nn.NewSocket(nn.AF_SP, proto)
}
type conn struct {
socket *nn.Socket
owner bool
reader io.Reader
}
func (c *conn) Read(b []byte) (int, error) {
if c.reader == nil {
data, err := c.socket.Recv(0)
if err != nil {
return 0, err
}
c.reader = bytes.NewReader(data)
}
return c.reader.Read(b)
}
func (c *conn) Write(b []byte) (int, error) {
// FIXME buffer stuff and expose Flush?
return c.socket.Send(b, 0)
}
func (c *conn) Close() error {
var err error
if c.owner {
err = c.socket.Close()
}
return err
}
func (c *conn) LocalAddr() net.Addr {
panic("not implemeneted")
return nil
}
func (c *conn) RemoteAddr() net.Addr {
panic("not implemented")
return nil
}
func (c *conn) SetDeadline(t time.Time) error {
return syscall.ENOTSUP
}
func (c *conn) SetReadDeadline(t time.Time) error {
return syscall.ENOTSUP
}
func (c *conn) SetWriteDeadline(t time.Time) error {
return syscall.ENOTSUP
}
type listener struct {
socket *nn.Socket
}
func Listen(transport, protocol, address string) (net.Listener, error) {
socket, err := newSocket(protocol)
if err != nil {
return nil, err
}
_, err = socket.Bind(fmt.Sprintf("%s://%s", transport, address))
return &listener{socket}, err
}
func (l *listener) Accept() (net.Conn, error) {
data, err := l.socket.Recv(0)
if err != nil {
return nil, err
}
c := &conn{
socket: l.socket,
reader: bytes.NewReader(data),
}
return c, err
}
func (l *listener) Close() error {
return l.socket.Close()
}
func (l *listener) Addr() net.Addr {
return nil
}