109 lines
2.9 KiB
Go
109 lines
2.9 KiB
Go
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package httpu
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import (
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"bufio"
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"bytes"
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"log"
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"net"
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"net/http"
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"regexp"
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)
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const (
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DefaultMaxMessageBytes = 2048
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)
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var (
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trailingWhitespaceRx = regexp.MustCompile(" +\r\n")
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crlf = []byte("\r\n")
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)
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// Handler is the interface by which received HTTPU messages are passed to
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// handling code.
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type Handler interface {
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// ServeMessage is called for each HTTPU message received. peerAddr contains
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// the address that the message was received from.
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ServeMessage(r *http.Request)
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}
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// HandlerFunc is a function-to-Handler adapter.
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type HandlerFunc func(r *http.Request)
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func (f HandlerFunc) ServeMessage(r *http.Request) {
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f(r)
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}
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// A Server defines parameters for running an HTTPU server.
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type Server struct {
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Addr string // UDP address to listen on
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Multicast bool // Should listen for multicast?
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Interface *net.Interface // Network interface to listen on for multicast, nil for default multicast interface
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Handler Handler // handler to invoke
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MaxMessageBytes int // maximum number of bytes to read from a packet, DefaultMaxMessageBytes if 0
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}
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// ListenAndServe listens on the UDP network address srv.Addr. If srv.Multicast
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// is true, then a multicast UDP listener will be used on srv.Interface (or
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// default interface if nil).
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func (srv *Server) ListenAndServe() error {
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var err error
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var addr *net.UDPAddr
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if addr, err = net.ResolveUDPAddr("udp", srv.Addr); err != nil {
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log.Fatal(err)
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}
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var conn net.PacketConn
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if srv.Multicast {
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if conn, err = net.ListenMulticastUDP("udp", srv.Interface, addr); err != nil {
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return err
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}
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} else {
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if conn, err = net.ListenUDP("udp", addr); err != nil {
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return err
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}
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}
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return srv.Serve(conn)
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}
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// Serve messages received on the given packet listener to the srv.Handler.
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func (srv *Server) Serve(l net.PacketConn) error {
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maxMessageBytes := DefaultMaxMessageBytes
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if srv.MaxMessageBytes != 0 {
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maxMessageBytes = srv.MaxMessageBytes
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}
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for {
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buf := make([]byte, maxMessageBytes)
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n, peerAddr, err := l.ReadFrom(buf)
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if err != nil {
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return err
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}
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buf = buf[:n]
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go func(buf []byte, peerAddr net.Addr) {
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// At least one router's UPnP implementation has added a trailing space
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// after "HTTP/1.1" - trim it.
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buf = trailingWhitespaceRx.ReplaceAllLiteral(buf, crlf)
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req, err := http.ReadRequest(bufio.NewReader(bytes.NewBuffer(buf)))
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if err != nil {
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log.Printf("httpu: Failed to parse request: %v", err)
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return
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}
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req.RemoteAddr = peerAddr.String()
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srv.Handler.ServeMessage(req)
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// No need to call req.Body.Close - underlying reader is bytes.Buffer.
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}(buf, peerAddr)
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}
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}
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// Serve messages received on the given packet listener to the given handler.
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func Serve(l net.PacketConn, handler Handler) error {
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srv := Server{
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Handler: handler,
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MaxMessageBytes: DefaultMaxMessageBytes,
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}
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return srv.Serve(l)
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}
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