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net.go
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net.go
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// package net is intended to provide compatible interfaces with the
// Go standard library's net package.
package net
import (
"errors"
"strconv"
"strings"
"time"
)
// DialUDP makes a UDP network connection. raadr is the port that the messages will
// be sent to, and laddr is the port that will be listened to in order to
// receive incoming messages.
func DialUDP(network string, laddr, raddr *UDPAddr) (*UDPSerialConn, error) {
addr := raddr.IP.String()
sendport := strconv.Itoa(raddr.Port)
listenport := strconv.Itoa(laddr.Port)
// disconnect any old socket
ActiveDevice.DisconnectSocket()
// connect new socket
err := ActiveDevice.ConnectUDPSocket(addr, sendport, listenport)
if err != nil {
return nil, err
}
return &UDPSerialConn{SerialConn: SerialConn{Adaptor: ActiveDevice}, laddr: laddr, raddr: raddr}, nil
}
// ListenUDP listens for UDP connections on the port listed in laddr.
func ListenUDP(network string, laddr *UDPAddr) (*UDPSerialConn, error) {
addr := "0"
sendport := "0"
listenport := strconv.Itoa(laddr.Port)
// disconnect any old socket
ActiveDevice.DisconnectSocket()
// connect new socket
err := ActiveDevice.ConnectUDPSocket(addr, sendport, listenport)
if err != nil {
return nil, err
}
return &UDPSerialConn{SerialConn: SerialConn{Adaptor: ActiveDevice}, laddr: laddr}, nil
}
// DialTCP makes a TCP network connection. raadr is the port that the messages will
// be sent to, and laddr is the port that will be listened to in order to
// receive incoming messages.
func DialTCP(network string, laddr, raddr *TCPAddr) (*TCPSerialConn, error) {
addr := raddr.IP.String()
sendport := strconv.Itoa(raddr.Port)
// disconnect any old socket?
//ActiveDevice.DisconnectSocket()
// connect new socket
err := ActiveDevice.ConnectTCPSocket(addr, sendport)
if err != nil {
return nil, err
}
return &TCPSerialConn{SerialConn: SerialConn{Adaptor: ActiveDevice}, laddr: laddr, raddr: raddr}, nil
}
// Dial connects to the address on the named network.
// It tries to provide a mostly compatible interface
// to net.Dial().
func Dial(network, address string) (Conn, error) {
switch network {
case "tcp":
raddr, err := ResolveTCPAddr(network, address)
if err != nil {
return nil, err
}
c, e := DialTCP(network, &TCPAddr{}, raddr)
return c.opConn(), e
case "udp":
raddr, err := ResolveUDPAddr(network, address)
if err != nil {
return nil, err
}
c, e := DialUDP(network, &UDPAddr{}, raddr)
return c.opConn(), e
default:
return nil, errors.New("invalid network for dial")
}
}
// SerialConn is a loosely net.Conn compatible implementation
type SerialConn struct {
Adaptor Adapter
}
// UDPSerialConn is a loosely net.Conn compatible intended to support
// UDP over serial.
type UDPSerialConn struct {
SerialConn
laddr *UDPAddr
raddr *UDPAddr
}
// NewUDPSerialConn returns a new UDPSerialConn/
func NewUDPSerialConn(c SerialConn, laddr, raddr *UDPAddr) *UDPSerialConn {
return &UDPSerialConn{SerialConn: c, raddr: raddr}
}
// TCPSerialConn is a loosely net.Conn compatible intended to support
// TCP over serial.
type TCPSerialConn struct {
SerialConn
laddr *TCPAddr
raddr *TCPAddr
}
// NewTCPSerialConn returns a new TCPSerialConn/
func NewTCPSerialConn(c SerialConn, laddr, raddr *TCPAddr) *TCPSerialConn {
return &TCPSerialConn{SerialConn: c, raddr: raddr}
}
// Read reads data from the connection.
// TODO: implement the full method functionality:
// Read can be made to time out and return an Error with Timeout() == true
// after a fixed time limit; see SetDeadline and SetReadDeadline.
func (c *SerialConn) Read(b []byte) (n int, err error) {
// read only the data that has been received via "+IPD" socket
return c.Adaptor.ReadSocket(b)
}
// Write writes data to the connection.
// TODO: implement the full method functionality for timeouts.
// Write can be made to time out and return an Error with Timeout() == true
// after a fixed time limit; see SetDeadline and SetWriteDeadline.
func (c *SerialConn) Write(b []byte) (n int, err error) {
// specify that is a data transfer to the
// currently open socket, not commands to the ESP8266/ESP32.
err = c.Adaptor.StartSocketSend(len(b))
if err != nil {
return
}
n, err = c.Adaptor.Write(b)
if err != nil {
return n, err
}
/* TODO(bcg): this is kind of specific to espat, should maybe refactor */
_, err = c.Adaptor.Response(1000)
if err != nil {
return n, err
}
return n, err
}
// Close closes the connection.
// Currently only supports a single Read or Write operations without blocking.
func (c *SerialConn) Close() error {
c.Adaptor.DisconnectSocket()
return nil
}
// LocalAddr returns the local network address.
func (c *UDPSerialConn) LocalAddr() Addr {
return c.laddr.opAddr()
}
// RemoteAddr returns the remote network address.
func (c *UDPSerialConn) RemoteAddr() Addr {
return c.raddr.opAddr()
}
func (c *UDPSerialConn) opConn() Conn {
if c == nil {
return nil
}
return c
}
// LocalAddr returns the local network address.
func (c *TCPSerialConn) LocalAddr() Addr {
return c.laddr.opAddr()
}
// RemoteAddr returns the remote network address.
func (c *TCPSerialConn) RemoteAddr() Addr {
return c.raddr.opAddr()
}
func (c *TCPSerialConn) opConn() Conn {
if c == nil {
return nil
}
return c
}
// SetDeadline sets the read and write deadlines associated
// with the connection. It is equivalent to calling both
// SetReadDeadline and SetWriteDeadline.
//
// A deadline is an absolute time after which I/O operations
// fail with a timeout (see type Error) instead of
// blocking. The deadline applies to all future and pending
// I/O, not just the immediately following call to Read or
// Write. After a deadline has been exceeded, the connection
// can be refreshed by setting a deadline in the future.
//
// An idle timeout can be implemented by repeatedly extending
// the deadline after successful Read or Write calls.
//
// A zero value for t means I/O operations will not time out.
func (c *SerialConn) SetDeadline(t time.Time) error {
return nil
}
// SetReadDeadline sets the deadline for future Read calls
// and any currently-blocked Read call.
// A zero value for t means Read will not time out.
func (c *SerialConn) SetReadDeadline(t time.Time) error {
return nil
}
// SetWriteDeadline sets the deadline for future Write calls
// and any currently-blocked Write call.
// Even if write times out, it may return n > 0, indicating that
// some of the data was successfully written.
// A zero value for t means Write will not time out.
func (c *SerialConn) SetWriteDeadline(t time.Time) error {
return nil
}
// ResolveTCPAddr returns an address of TCP end point.
//
// The network must be a TCP network name.
func ResolveTCPAddr(network, address string) (*TCPAddr, error) {
// TODO: make sure network is 'tcp'
// separate domain from port, if any
r := strings.Split(address, ":")
addr, err := ActiveDevice.GetDNS(r[0])
if err != nil {
return nil, err
}
ip := IP(addr)
if len(r) > 1 {
port, e := strconv.Atoi(r[1])
if e != nil {
return nil, e
}
return &TCPAddr{IP: ip, Port: port}, nil
}
return &TCPAddr{IP: ip}, nil
}
// ResolveUDPAddr returns an address of UDP end point.
//
// The network must be a UDP network name.
func ResolveUDPAddr(network, address string) (*UDPAddr, error) {
// TODO: make sure network is 'udp'
// separate domain from port, if any
r := strings.Split(address, ":")
addr, err := ActiveDevice.GetDNS(r[0])
if err != nil {
return nil, err
}
ip := IP(addr)
if len(r) > 1 {
port, e := strconv.Atoi(r[1])
if e != nil {
return nil, e
}
return &UDPAddr{IP: ip, Port: port}, nil
}
return &UDPAddr{IP: ip}, nil
}
// The following definitions are here to support a Golang standard package
// net-compatible interface for IP until TinyGo can compile the net package.
// IP is an IP address. Unlike the standard implementation, it is only
// a buffer of bytes that contains the string form of the IP address, not the
// full byte format used by the Go standard .
type IP []byte
// UDPAddr here to serve as compatible type. until TinyGo can compile the net package.
type UDPAddr struct {
IP IP
Port int
Zone string // IPv6 scoped addressing zone; added in Go 1.1
}
// Network returns the address's network name, "udp".
func (a *UDPAddr) Network() string { return "udp" }
func (a *UDPAddr) String() string {
if a == nil {
return "<nil>"
}
if a.Port != 0 {
return a.IP.String() + ":" + strconv.Itoa(a.Port)
}
return a.IP.String()
}
func (a *UDPAddr) opAddr() Addr {
if a == nil {
return nil
}
return a
}
// TCPAddr here to serve as compatible type. until TinyGo can compile the net package.
type TCPAddr struct {
IP IP
Port int
Zone string // IPv6 scoped addressing zone
}
// Network returns the address's network name, "tcp".
func (a *TCPAddr) Network() string { return "tcp" }
func (a *TCPAddr) String() string {
if a == nil {
return "<nil>"
}
if a.Port != 0 {
return a.IP.String() + ":" + strconv.Itoa(a.Port)
}
return a.IP.String()
}
func (a *TCPAddr) opAddr() Addr {
if a == nil {
return nil
}
return a
}
// ParseIP parses s as an IP address, returning the result.
func ParseIP(s string) IP {
b := strings.Split(s, ".")
if len(b) == 4 {
ip := make([]byte, 4)
for i := range ip {
x, _ := strconv.ParseUint(b[i], 10, 8)
ip[i] = byte(x)
}
return IP(ip)
}
return IP([]byte(s))
}
// String returns the string form of the IP address ip.
func (ip IP) String() string {
if len(ip) < 4 {
return ""
}
return strconv.Itoa(int(ip[0])) + "." + strconv.Itoa(int(ip[1])) + "." + strconv.Itoa(int(ip[2])) + "." + strconv.Itoa(int(ip[3]))
}
// Conn is a generic stream-oriented network connection.
// This interface is from the Go standard library.
type Conn interface {
// Read reads data from the connection.
// Read can be made to time out and return an 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 an Error with Timeout() == true
// after a fixed time limit; see SetDeadline and SetWriteDeadline.
Write(b []byte) (n int, err error)
// Close closes the connection.
// Any blocked Read or Write operations will be unblocked and return errors.
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. It is equivalent to calling both
// SetReadDeadline and SetWriteDeadline.
//
// A deadline is an absolute time after which I/O operations
// fail with a timeout (see type Error) instead of
// blocking. The deadline applies to all future and pending
// I/O, not just the immediately following call to Read or
// Write. After a deadline has been exceeded, the connection
// can be refreshed by setting a deadline in the future.
//
// An idle timeout can be implemented by repeatedly extending
// the deadline after successful Read or Write calls.
//
// A zero value for t means I/O operations will not time out.
SetDeadline(t time.Time) error
// SetReadDeadline sets the deadline for future Read calls
// and any currently-blocked Read call.
// A zero value for t means Read will not time out.
SetReadDeadline(t time.Time) error
// SetWriteDeadline sets the deadline for future Write calls
// and any currently-blocked Write call.
// Even if write times out, it may return n > 0, indicating that
// some of the data was successfully written.
// A zero value for t means Write will not time out.
SetWriteDeadline(t time.Time) error
}
// Addr represents a network end point address.
type Addr interface {
Network() string // name of the network (for example, "tcp", "udp")
String() string // string form of address (for example, "192.0.2.1:25", "[2001:db8::1]:80")
}