70 lines
1.5 KiB
Go
70 lines
1.5 KiB
Go
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package goupnp
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import (
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"bufio"
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"bytes"
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"fmt"
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"net"
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"net/http"
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"time"
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)
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// TODO: RoundTripper is probably the wrong interface, as there could be
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// multiple responses to a request.
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type udpRoundTripper struct {
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// If zero, defaults to 3 second deadline (a zero deadline makes no sense).
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Deadline time.Duration
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MaxWaitSeconds int
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}
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func (urt udpRoundTripper) RoundTrip(r *http.Request) (*http.Response, error) {
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conn, err := net.ListenPacket("udp", ":0")
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if err != nil {
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return nil, err
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}
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defer conn.Close()
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var requestBuf bytes.Buffer
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if err := r.Write(&requestBuf); err != nil {
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return nil, err
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}
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destAddr, err := net.ResolveUDPAddr("udp", r.Host)
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if err != nil {
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return nil, err
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}
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deadline := urt.Deadline
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if urt.Deadline == 0 {
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deadline = 3 * time.Second
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}
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if err = conn.SetDeadline(time.Now().Add(deadline)); err != nil {
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return nil, err
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}
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// Send request.
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if n, err := conn.WriteTo(requestBuf.Bytes(), destAddr); err != nil {
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return nil, err
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} else if n < len(requestBuf.Bytes()) {
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return nil, fmt.Errorf("goupnp: wrote %d bytes rather than full %d in request",
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n, len(requestBuf.Bytes()))
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}
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// Await response.
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responseBytes := make([]byte, 2048)
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n, _, err := conn.ReadFrom(responseBytes)
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if err != nil {
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return nil, err
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}
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responseBytes = responseBytes[:n]
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// Parse response.
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response, err := http.ReadResponse(bufio.NewReader(bytes.NewBuffer(responseBytes)), r)
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if err != nil {
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return nil, err
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}
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return response, err
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}
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