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// SPDX-License-Identifier: CC0-1.0
package pipeln
import (
"context"
"errors"
"net"
)
var (
ErrBadAddress = errors.New("bad address")
ErrClosed = errors.New("closed listener")
)
type addr struct {
ln *PipeListenerDialer
}
var _ net.Addr = addr{}
func (addr) Network() string {
return "pipe"
}
func (a addr) String() string {
return "pipe:" + a.ln.addr
}
// PipeListener can be used to simulate client-server interaction within
// the same process. Useful for testing. Somehow the Go standard library
// provides net.Pipe but no net.PipeListener.
type PipeListenerDialer struct {
addr string
conns chan net.Conn
done chan struct{}
}
var _ net.Listener = &PipeListenerDialer{}
func (ln *PipeListenerDialer) Accept() (net.Conn, error) {
select {
case conn := <-ln.conns:
return conn, nil
case <-ln.done:
return nil, ErrClosed
}
}
func (ln *PipeListenerDialer) Addr() net.Addr {
return addr{ln}
}
func (ln *PipeListenerDialer) Close() error {
close(ln.done)
return nil
}
func (ln *PipeListenerDialer) Dial(_, addr string) (net.Conn, error) {
if addr != ln.addr {
return nil, ErrBadAddress
}
s, c := net.Pipe()
select {
case <-ln.done:
return nil, ErrClosed
case ln.conns <- s:
return c, nil
}
}
func (ln *PipeListenerDialer) DialContext(_ context.Context, network, addr string) (net.Conn, error) {
return ln.Dial(network, addr)
}
func New(addr string) *PipeListenerDialer {
return &PipeListenerDialer{addr, make(chan net.Conn), make(chan struct{})}
}
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