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// SPDX-License-Identifier: CC0-1.0
package pipeln
import (
"context"
"net"
"syscall"
)
// PipeListenerDialer can be used to simulate client-server interaction
// within the same process.
type PipeListenerDialer struct {
addr string
conns chan net.Conn
done chan struct{}
ok bool
}
var _ net.Listener = &PipeListenerDialer{}
// See net.Listener.Accept for more details.
func (ln *PipeListenerDialer) Accept() (net.Conn, error) {
select {
case conn := <-ln.conns:
return conn, nil
case <-ln.done:
return nil, syscall.EINVAL
}
}
// See net.Listener.Addr for more details.
func (ln *PipeListenerDialer) Addr() net.Addr {
return addr{ln}
}
// See net.Listener.Close for more details.
func (ln *PipeListenerDialer) Close() error {
if !ln.ok {
return syscall.EINVAL
}
close(ln.done)
ln.ok = false
return nil
}
// See net.Dialer.Dial for more details.
func (ln *PipeListenerDialer) Dial(_, addr string) (net.Conn, error) {
return ln.DialContext(context.Background(), "", addr)
}
// DialContext is a dummy wrapper around Dial.
func (ln *PipeListenerDialer) DialContext(ctx context.Context, _, addr string) (net.Conn, error) {
if addr != ln.addr {
return nil, syscall.EINVAL
}
s, c := net.Pipe()
select {
case ln.conns <- s:
return c, nil
case <-ln.done:
return nil, syscall.ECONNREFUSED
case <-ctx.Done():
return nil, ctx.Err()
}
}
// DialContextAddr is a dummy wrapper around Dial.
//
// This function can be passed to grpc.WithContextDialer.
func (ln *PipeListenerDialer) DialContextAddr(ctx context.Context, addr string) (net.Conn, error) {
return ln.DialContext(ctx, "", addr)
}
// New returns a PipeListenerDialer that will only accept connections
// made to the given addr.
func New(addr string) *PipeListenerDialer {
return &PipeListenerDialer{addr, make(chan net.Conn), make(chan struct{}), true}
}
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
}
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