91 lines
2.0 KiB
Go
91 lines
2.0 KiB
Go
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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// tcpTimeoutConn wraps a *net.TCPConn to standardise protocol timeouts / deadline resets.
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type tcpTimeoutConn struct {
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*net.TCPConn
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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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// newTCPTimeoutConn returns an instance of newTCPTimeoutConn.
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func newTCPTimeoutConn(
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conn *net.TCPConn,
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connDeadline time.Duration) *tcpTimeoutConn {
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return &tcpTimeoutConn{
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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 TCPConn in our timeout wrapper
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conn := newTCPTimeoutConn(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 tcpTimeoutConn) Read(b []byte) (int, error) {
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// Reset deadline
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c.TCPConn.SetReadDeadline(time.Now().Add(c.connDeadline))
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return c.TCPConn.Read(b)
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}
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// Write implements net.Listener.
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func (c tcpTimeoutConn) Write(b []byte) (int, error) {
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// Reset deadline
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c.TCPConn.SetWriteDeadline(time.Now().Add(c.connDeadline))
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return c.TCPConn.Write(b)
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}
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