119 lines
2.1 KiB
Go
119 lines
2.1 KiB
Go
// Copyright (C) 2018 Storj Labs, Inc.
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// See LICENSE for copying information.
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package main
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import (
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"fmt"
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"net"
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"sync"
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"time"
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)
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// UDPSource is a packet source
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type UDPSource struct {
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address string
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mu sync.Mutex
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conn *net.UDPConn
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buf [1024 * 10]byte
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closed bool
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}
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// NewUDPSource creates a UDPSource that listens on address
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func NewUDPSource(address string) *UDPSource {
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return &UDPSource{address: address}
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}
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// Next implements the Source interface
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func (s *UDPSource) Next() ([]byte, time.Time, error) {
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s.mu.Lock()
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defer s.mu.Unlock()
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if s.closed {
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return nil, time.Time{}, fmt.Errorf("udp source closed")
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}
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if s.conn == nil {
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addr, err := net.ResolveUDPAddr("udp", s.address)
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if err != nil {
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return nil, time.Time{}, err
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}
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conn, err := net.ListenUDP("udp", addr)
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if err != nil {
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return nil, time.Time{}, err
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}
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s.conn = conn
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}
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n, _, err := s.conn.ReadFrom(s.buf[:])
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if err != nil {
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return nil, time.Time{}, err
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}
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return s.buf[:n], time.Now(), nil
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}
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// Close closes the source
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func (s *UDPSource) Close() error {
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s.mu.Lock()
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defer s.mu.Unlock()
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s.closed = true
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if s.conn != nil {
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return s.conn.Close()
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}
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return nil
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}
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// UDPDest is a packet destination. IMPORTANT: It throws away timestamps.
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type UDPDest struct {
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address string
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mu sync.Mutex
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addr *net.UDPAddr
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conn *net.UDPConn
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closed bool
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}
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// NewUDPDest creates a UDPDest that sends incoming packets to address.
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func NewUDPDest(address string) *UDPDest {
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return &UDPDest{address: address}
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}
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// Packet implements PacketDest
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func (d *UDPDest) Packet(data []byte, ts time.Time) error {
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d.mu.Lock()
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defer d.mu.Unlock()
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if d.closed {
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return fmt.Errorf("closed destination")
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}
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if d.conn == nil {
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addr, err := net.ResolveUDPAddr("udp", d.address)
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if err != nil {
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return err
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}
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conn, err := net.ListenUDP("udp", &net.UDPAddr{Port: 0})
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if err != nil {
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return err
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}
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d.addr = addr
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d.conn = conn
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}
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_, err := d.conn.WriteTo(data, d.addr)
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return err
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}
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// Close closes the destination
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func (d *UDPDest) Close() error {
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d.mu.Lock()
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defer d.mu.Unlock()
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d.closed = true
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if d.conn != nil {
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return d.conn.Close()
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}
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return nil
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}
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