56 lines
1.0 KiB
Go
56 lines
1.0 KiB
Go
package client
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import (
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"bytes"
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"fmt"
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"io"
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"net"
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"time"
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)
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const PicomapPort = 28781
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type udpTransport struct {
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conn *net.UDPConn
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buf bytes.Buffer
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}
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func NewUDP(addr string, timeout time.Duration) (*Client, error) {
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raddr, err := net.ResolveUDPAddr("udp4", fmt.Sprintf("%s:%d", addr, PicomapPort))
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if err != nil {
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return nil, fmt.Errorf("resolve %s: %w", addr, err)
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}
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conn, err := net.DialUDP("udp4", nil, raddr)
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if err != nil {
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return nil, fmt.Errorf("dial %s: %w", addr, err)
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}
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return &Client{transport: &udpTransport{conn: conn}, timeout: timeout}, nil
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}
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func (t *udpTransport) Send(data []byte) error {
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_, err := t.conn.Write(data)
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return err
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}
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func (t *udpTransport) SetReadTimeout(timeout time.Duration) {
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t.conn.SetReadDeadline(time.Now().Add(timeout))
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}
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func (t *udpTransport) Reader() io.Reader {
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for {
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if t.buf.Len() > 0 {
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return &t.buf
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}
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pkt := make([]byte, 1500)
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n, err := t.conn.Read(pkt)
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if err != nil {
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return &t.buf
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}
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t.buf.Write(pkt[:n])
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}
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}
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func (t *udpTransport) Close() error {
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return t.conn.Close()
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}
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