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90 lines
2.0 KiB
90 lines
2.0 KiB
package privval
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import (
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"net"
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"time"
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)
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// timeoutError can be used to check if an error returned from the netp package
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// was due to a timeout.
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type timeoutError interface {
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Timeout() bool
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}
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// tcpTimeoutListener implements net.Listener.
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var _ net.Listener = (*tcpTimeoutListener)(nil)
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// tcpTimeoutListener wraps a *net.TCPListener to standardise protocol timeouts
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// and potentially other tuning parameters.
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type tcpTimeoutListener struct {
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*net.TCPListener
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acceptDeadline time.Duration
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connDeadline time.Duration
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period time.Duration
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}
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// timeoutConn wraps a net.Conn to standardise protocol timeouts / deadline resets.
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type timeoutConn struct {
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net.Conn
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connDeadline time.Duration
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}
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// newTCPTimeoutListener returns an instance of tcpTimeoutListener.
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func newTCPTimeoutListener(
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ln net.Listener,
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acceptDeadline, connDeadline time.Duration,
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period time.Duration,
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) tcpTimeoutListener {
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return tcpTimeoutListener{
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TCPListener: ln.(*net.TCPListener),
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acceptDeadline: acceptDeadline,
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connDeadline: connDeadline,
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period: period,
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}
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}
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// newTimeoutConn returns an instance of newTCPTimeoutConn.
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func newTimeoutConn(
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conn net.Conn,
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connDeadline time.Duration) *timeoutConn {
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return &timeoutConn{
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conn,
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connDeadline,
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}
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}
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// Accept implements net.Listener.
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func (ln tcpTimeoutListener) Accept() (net.Conn, error) {
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err := ln.SetDeadline(time.Now().Add(ln.acceptDeadline))
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if err != nil {
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return nil, err
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}
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tc, err := ln.AcceptTCP()
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if err != nil {
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return nil, err
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}
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// Wrap the conn in our timeout wrapper
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conn := newTimeoutConn(tc, ln.connDeadline)
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return conn, nil
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}
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// Read implements net.Listener.
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func (c timeoutConn) Read(b []byte) (n int, err error) {
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// Reset deadline
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c.Conn.SetReadDeadline(time.Now().Add(c.connDeadline))
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return c.Conn.Read(b)
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}
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// Write implements net.Listener.
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func (c timeoutConn) Write(b []byte) (n int, err error) {
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// Reset deadline
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c.Conn.SetWriteDeadline(time.Now().Add(c.connDeadline))
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return c.Conn.Write(b)
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}
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