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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package net provides a portable interface to Unix networks sockets,
// including TCP/IP, UDP, domain name resolution, and Unix domain sockets.
package net
// TODO(rsc):
// support for raw ethernet sockets
import (
"errors"
"time"
)
// Addr represents a network end point address.
type Addr interface {
Network() string // name of the network
String() string // string form of address
}
// Conn is a generic stream-oriented network connection.
type Conn interface {
// Read reads data from the connection.
// Read can be made to time out and return a net.Error with Timeout() == true
// after a fixed time limit; see SetDeadline and SetReadDeadline.
Read(b []byte) (n int, err error)
// Write writes data to the connection.
// Write can be made to time out and return a net.Error with Timeout() == true
// after a fixed time limit; see SetDeadline and SetWriteDeadline.
Write(b []byte) (n int, err error)
// Close closes the connection.
Close() error
// LocalAddr returns the local network address.
LocalAddr() Addr
// RemoteAddr returns the remote network address.
RemoteAddr() Addr
// SetDeadline sets the read and write deadlines associated
// with the connection.
SetDeadline(t time.Time) error
// SetReadDeadline sets the deadline for all Read calls to return.
// If the deadline is reached, Read will fail with a timeout
// (see type Error) instead of blocking.
// A zero value for t means Read will not time out.
SetReadDeadline(t time.Time) error
// SetWriteDeadline sets the deadline for all Write calls to return.
// If the deadline is reached, Write will fail with a timeout
// (see type Error) instead of blocking.
// A zero value for t means Write will not time out.
// Even if write times out, it may return n > 0, indicating that
// some of the data was successfully written.
SetWriteDeadline(t time.Time) error
}
// An Error represents a network error.
type Error interface {
error
Timeout() bool // Is the error a timeout?
Temporary() bool // Is the error temporary?
}
// PacketConn is a generic packet-oriented network connection.
type PacketConn interface {
// ReadFrom reads a packet from the connection,
// copying the payload into b. It returns the number of
// bytes copied into b and the return address that
// was on the packet.
// ReadFrom can be made to time out and return
// an error with Timeout() == true after a fixed time limit;
// see SetDeadline and SetReadDeadline.
ReadFrom(b []byte) (n int, addr Addr, err error)
// WriteTo writes a packet with payload b to addr.
// WriteTo can be made to time out and return
// an error with Timeout() == true after a fixed time limit;
// see SetDeadline and SetWriteDeadline.
// On packet-oriented connections, write timeouts are rare.
WriteTo(b []byte, addr Addr) (n int, err error)
// Close closes the connection.
Close() error
// LocalAddr returns the local network address.
LocalAddr() Addr
// SetDeadline sets the read and write deadlines associated
// with the connection.
SetDeadline(t time.Time) error
// SetReadDeadline sets the deadline for all Read calls to return.
// If the deadline is reached, Read will fail with a timeout
// (see type Error) instead of blocking.
// A zero value for t means Read will not time out.
SetReadDeadline(t time.Time) error
// SetWriteDeadline sets the deadline for all Write calls to return.
// If the deadline is reached, Write will fail with a timeout
// (see type Error) instead of blocking.
// A zero value for t means Write will not time out.
// Even if write times out, it may return n > 0, indicating that
// some of the data was successfully written.
SetWriteDeadline(t time.Time) error
}
// A Listener is a generic network listener for stream-oriented protocols.
type Listener interface {
// Accept waits for and returns the next connection to the listener.
Accept() (c Conn, err error)
// Close closes the listener.
Close() error
// Addr returns the listener's network address.
Addr() Addr
}
var errMissingAddress = errors.New("missing address")
type OpError struct {
Op string
Net string
Addr Addr
Err error
}
func (e *OpError) Error() string {
if e == nil {
return "<nil>"
}
s := e.Op
if e.Net != "" {
s += " " + e.Net
}
if e.Addr != nil {
s += " " + e.Addr.String()
}
s += ": " + e.Err.Error()
return s
}
type temporary interface {
Temporary() bool
}
func (e *OpError) Temporary() bool {
t, ok := e.Err.(temporary)
return ok && t.Temporary()
}
type timeout interface {
Timeout() bool
}
func (e *OpError) Timeout() bool {
t, ok := e.Err.(timeout)
return ok && t.Timeout()
}
type timeoutError struct{}
func (e *timeoutError) Error() string { return "i/o timeout" }
func (e *timeoutError) Timeout() bool { return true }
func (e *timeoutError) Temporary() bool { return true }
var errTimeout error = &timeoutError{}
type AddrError struct {
Err string
Addr string
}
func (e *AddrError) Error() string {
if e == nil {
return "<nil>"
}
s := e.Err
if e.Addr != "" {
s += " " + e.Addr
}
return s
}
func (e *AddrError) Temporary() bool {
return false
}
func (e *AddrError) Timeout() bool {
return false
}
type UnknownNetworkError string
func (e UnknownNetworkError) Error() string { return "unknown network " + string(e) }
func (e UnknownNetworkError) Temporary() bool { return false }
func (e UnknownNetworkError) Timeout() bool { return false }
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