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transport.go
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transport.go
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package gorpc
import (
"crypto/tls"
"io"
"net"
"time"
)
var (
dialer = &net.Dialer{
Timeout: 10 * time.Second,
KeepAlive: 30 * time.Second,
}
)
// DialFunc is a function intended for setting to Client.Dial.
//
// It is expected that the returned conn immediately
// sends all the data passed via Write() to the server.
// Otherwise gorpc may hang.
// The conn implementation must call Flush() on underlying buffered
// streams before returning from Write().
type DialFunc func(addr string) (conn io.ReadWriteCloser, err error)
// Listener is an interface for custom listeners intended for the Server.
type Listener interface {
// Init is called on server start.
//
// addr contains the address set at Server.Addr.
Init(addr string) error
// Accept must return incoming connections from clients.
// clientAddr must contain client's address in user-readable view.
//
// It is expected that the returned conn immediately
// sends all the data passed via Write() to the client.
// Otherwise gorpc may hang.
// The conn implementation must call Flush() on underlying buffered
// streams before returning from Write().
Accept() (conn io.ReadWriteCloser, clientAddr string, err error)
// Close closes the listener.
// All pending calls to Accept() must immediately return errors after
// Close is called.
// All subsequent calls to Accept() must immediately return error.
Close() error
// Addr returns the listener's network address.
ListenAddr() net.Addr
}
func defaultDial(addr string) (conn io.ReadWriteCloser, err error) {
return dialer.Dial("tcp", addr)
}
type defaultListener struct {
L net.Listener
}
func (ln *defaultListener) Init(addr string) (err error) {
ln.L, err = net.Listen("tcp", addr)
return
}
func (ln *defaultListener) ListenAddr() net.Addr {
if ln.L != nil {
return ln.L.Addr()
}
return nil
}
func (ln *defaultListener) Accept() (conn io.ReadWriteCloser, clientAddr string, err error) {
c, err := ln.L.Accept()
if err != nil {
return nil, "", err
}
if err = setupKeepalive(c); err != nil {
c.Close()
return nil, "", err
}
return c, c.RemoteAddr().String(), nil
}
func (ln *defaultListener) Close() error {
return ln.L.Close()
}
func setupKeepalive(conn net.Conn) error {
tcpConn := conn.(*net.TCPConn)
if err := tcpConn.SetKeepAlive(true); err != nil {
return err
}
if err := tcpConn.SetKeepAlivePeriod(30 * time.Second); err != nil {
return err
}
return nil
}
type netListener struct {
F func(addr string) (net.Listener, error)
L net.Listener
}
func (ln *netListener) Init(addr string) (err error) {
ln.L, err = ln.F(addr)
return
}
func (ln *netListener) ListenAddr() net.Addr {
if ln.L != nil {
return ln.L.Addr()
}
return nil
}
func (ln *netListener) Accept() (conn io.ReadWriteCloser, clientAddr string, err error) {
c, err := ln.L.Accept()
if err != nil {
return nil, "", err
}
return c, c.RemoteAddr().String(), nil
}
func (ln *netListener) Close() error {
return ln.L.Close()
}
func unixDial(addr string) (conn io.ReadWriteCloser, err error) {
c, err := net.Dial("unix", addr)
if err != nil {
return nil, err
}
return c, err
}
// NewTCPClient creates a client connecting over TCP to the server
// listening to the given addr.
//
// The returned client must be started after optional settings' adjustment.
//
// The corresponding server must be created with NewTCPServer().
func NewTCPClient(addr string) *Client {
return &Client{
Addr: addr,
Dial: defaultDial,
}
}
// NewTCPServer creates a server listening for TCP connections
// on the given addr and processing incoming requests
// with the given HandlerFunc.
//
// The returned server must be started after optional settings' adjustment.
//
// The corresponding client must be created with NewTCPClient().
func NewTCPServer(addr string, handler HandlerFunc) *Server {
return &Server{
Addr: addr,
Handler: handler,
Listener: &defaultListener{},
}
}
// NewUnixClient creates a client connecting over unix socket
// to the server listening to the given addr.
//
// The returned client must be started after optional settings' adjustment.
//
// The corresponding server must be created with NewUnixServer().
func NewUnixClient(addr string) *Client {
return &Client{
Addr: addr,
Dial: unixDial,
// There is little sense in compressing rpc data passed
// over local unix sockets.
DisableCompression: true,
// Sacrifice the number of Write() calls to the smallest
// possible latency, since it has higher priority in local IPC.
FlushDelay: -1,
}
}
// NewUnixServer creates a server listening for unix connections
// on the given addr and processing incoming requests
// with the given HandlerFunc.
//
// The returned server must be started after optional settings' adjustment.
//
// The corresponding client must be created with NewUnixClient().
func NewUnixServer(addr string, handler HandlerFunc) *Server {
return &Server{
Addr: addr,
Handler: handler,
Listener: &netListener{
F: func(addr string) (net.Listener, error) {
return net.Listen("unix", addr)
},
},
// Sacrifice the number of Write() calls to the smallest
// possible latency, since it has higher priority in local IPC.
FlushDelay: -1,
}
}
// NewTLSClient creates a client connecting over TLS (aka SSL) to the server
// listening to the given addr using the given TLS config.
//
// The returned client must be started after optional settings' adjustment.
//
// The corresponding server must be created with NewTLSServer().
func NewTLSClient(addr string, cfg *tls.Config) *Client {
return &Client{
Addr: addr,
Dial: func(addr string) (conn io.ReadWriteCloser, err error) {
c, err := tls.DialWithDialer(dialer, "tcp", addr, cfg)
if err != nil {
return nil, err
}
return c, err
},
}
}
// NewTLSServer creates a server listening for TLS (aka SSL) connections
// on the given addr and processing incoming requests
// with the given HandlerFunc.
// cfg must contain TLS settings for the server.
//
// The returned server must be started after optional settings' adjustment.
//
// The corresponding client must be created with NewTLSClient().
func NewTLSServer(addr string, handler HandlerFunc, cfg *tls.Config) *Server {
return &Server{
Addr: addr,
Handler: handler,
Listener: &netListener{
F: func(addr string) (net.Listener, error) {
return tls.Listen("tcp", addr, cfg)
},
},
}
}