forked from tinygo-org/drivers
/
tcp.go
270 lines (233 loc) · 5.87 KB
/
tcp.go
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package wifinina
import (
"errors"
"strconv"
"time"
)
const (
ReadBufferSize = 128
)
type readBuffer struct {
data [ReadBufferSize]byte
head int
size int
}
func (d *Device) GetDNS(domain string) (string, error) {
ipAddr, err := d.GetHostByName(domain)
return ipAddr.String(), err
}
func (d *Device) ConnectTCPSocket(addr, portStr string) error {
return d.connectSocket(addr, portStr, ProtoModeTCP)
}
func (d *Device) ConnectSSLSocket(addr, portStr string) error {
return d.connectSocket(addr, portStr, ProtoModeTLS)
}
func (d *Device) connectSocket(addr, portStr string, mode uint8) error {
d.proto, d.ip, d.port = mode, 0, 0
// convert port to uint16
port, err := convertPort(portStr)
if err != nil {
return err
}
hostname := addr
ip := uint32(0)
if mode != ProtoModeTLS {
// look up the hostname if necessary; if an IP address was specified, the
// same will be returned. Otherwise, an IPv4 for the hostname is returned.
ipAddr, err := d.GetHostByName(addr)
if err != nil {
return err
}
hostname = ""
ip = ipAddr.AsUint32()
}
// check to see if socket is already set; if so, stop it
if d.sock != NoSocketAvail {
if err := d.stop(); err != nil {
return err
}
}
// get a socket from the device
if d.sock, err = d.GetSocket(); err != nil {
return err
}
// attempt to start the client
if err := d.StartClient(hostname, ip, port, d.sock, mode); err != nil {
return err
}
// FIXME: this 4 second timeout is simply mimicking the Arduino driver
start := time.Now()
for time.Since(start) < 4*time.Second {
connected, err := d.IsConnected()
if err != nil {
return err
}
if connected {
return nil
}
time.Sleep(1 * time.Millisecond)
}
return ErrConnectionTimeout
}
func convertPort(portStr string) (uint16, error) {
p64, err := strconv.ParseUint(portStr, 10, 16)
if err != nil {
return 0, errors.New("could not convert port to uint16: " + err.Error())
}
return uint16(p64), nil
}
func (d *Device) ConnectUDPSocket(addr, portStr, lportStr string) (err error) {
d.proto, d.ip, d.port = ProtoModeUDP, 0, 0
// convert remote port to uint16
if d.port, err = convertPort(portStr); err != nil {
return err
}
// convert local port to uint16
var lport uint16
if lport, err = convertPort(lportStr); err != nil {
return err
}
// look up the hostname if necessary; if an IP address was specified, the
// same will be returned. Otherwise, an IPv4 for the hostname is returned.
ipAddr, err := d.GetHostByName(addr)
if err != nil {
return err
}
d.ip = ipAddr.AsUint32()
// check to see if socket is already set; if so, stop it
// TODO: we can probably have more than one socket at once right?
if d.sock != NoSocketAvail {
if err := d.stop(); err != nil {
return err
}
}
// get a socket from the device
if d.sock, err = d.GetSocket(); err != nil {
return err
}
// start listening for UDP packets on the local port
if err := d.StartServer(lport, d.sock, d.proto); err != nil {
return err
}
return nil
}
func (d *Device) DisconnectSocket() error {
return d.stop()
}
func (d *Device) StartSocketSend(size int) error {
// not needed for WiFiNINA???
return nil
}
func (d *Device) Response(timeout int) ([]byte, error) {
return nil, nil
}
func (d *Device) Write(b []byte) (n int, err error) {
if d.sock == NoSocketAvail {
return 0, ErrNoSocketAvail
}
if len(b) == 0 {
return 0, ErrNoData
}
if d.proto == ProtoModeUDP {
if err := d.StartClient("", d.ip, d.port, d.sock, d.proto); err != nil {
return 0, errors.New("error in startClient: " + err.Error())
}
if _, err := d.InsertDataBuf(b, d.sock); err != nil {
return 0, errors.New("error in insertDataBuf: " + err.Error())
}
if _, err := d.SendUDPData(d.sock); err != nil {
return 0, errors.New("error in sendUDPData: " + err.Error())
}
return len(b), nil
} else {
written, err := d.SendData(b, d.sock)
if err != nil {
return 0, err
}
if written == 0 {
return 0, ErrDataNotWritten
}
if sent, _ := d.CheckDataSent(d.sock); !sent {
return 0, ErrCheckDataError
}
return len(b), nil
}
return len(b), nil
}
func (d *Device) ReadSocket(b []byte) (n int, err error) {
avail, err := d.available()
if err != nil {
println("ReadSocket error: " + err.Error())
return 0, err
}
if avail == 0 {
return 0, nil
}
length := len(b)
if avail < length {
length = avail
}
copy(b, d.readBuf.data[d.readBuf.head:d.readBuf.head+length])
d.readBuf.head += length
d.readBuf.size -= length
return length, nil
}
// IsSocketDataAvailable returns of there is socket data available
func (d *Device) IsSocketDataAvailable() bool {
n, err := d.available()
return err == nil && n > 0
}
func (d *Device) available() (int, error) {
if d.readBuf.size == 0 {
n, err := d.GetDataBuf(d.sock, d.readBuf.data[:])
if n > 0 {
d.readBuf.head = 0
d.readBuf.size = n
}
if err != nil {
return int(n), err
}
}
return d.readBuf.size, nil
}
func (d *Device) IsConnected() (bool, error) {
if d.sock == NoSocketAvail {
return false, nil
}
s, err := d.status()
if err != nil {
return false, err
}
isConnected := !(s == TCPStateListen || s == TCPStateClosed ||
s == TCPStateFinWait1 || s == TCPStateFinWait2 || s == TCPStateTimeWait ||
s == TCPStateSynSent || s == TCPStateSynRcvd || s == TCPStateCloseWait)
// TODO: investigate if the below is necessary (as per Arduino driver)
//if !isConnected {
// //close socket buffer?
// WiFiSocketBuffer.close(_sock);
// _sock = 255;
//}
return isConnected, nil
}
func (d *Device) status() (uint8, error) {
if d.sock == NoSocketAvail {
return TCPStateClosed, nil
}
return d.GetClientState(d.sock)
}
func (d *Device) stop() error {
if d.sock == NoSocketAvail {
return nil
}
d.StopClient(d.sock)
start := time.Now()
for time.Since(start) < 5*time.Second {
st, _ := d.status()
if st == TCPStateClosed {
break
}
time.Sleep(1 * time.Millisecond)
}
d.sock = NoSocketAvail
return nil
}