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// Copyright 2021-2023 The Connect Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package memhttp
import (
"context"
"errors"
"net"
"sync"
)
var (
errListenerClosed = errors.New("listener closed")
)
// memoryListener is a net.Listener that listens on an in memory network.
type memoryListener struct {
addr memoryAddr
conns chan net.Conn
once sync.Once
closed chan struct{}
}
// newMemoryListener returns a new in-memory listener.
func newMemoryListener(addr string) *memoryListener {
return &memoryListener{
addr: memoryAddr(addr),
conns: make(chan net.Conn),
closed: make(chan struct{}),
}
}
// Accept implements net.Listener.
func (l *memoryListener) Accept() (net.Conn, error) {
select {
case <-l.closed:
return nil, &net.OpError{
Op: "accept",
Net: l.addr.Network(),
Addr: l.addr,
Err: errListenerClosed,
}
case server := <-l.conns:
return server, nil
}
}
// Close implements net.Listener.
func (l *memoryListener) Close() error {
l.once.Do(func() {
close(l.closed)
})
return nil
}
// Addr implements net.Listener.
func (l *memoryListener) Addr() net.Addr {
return l.addr
}
// DialContext is the type expected by http.Transport.DialContext.
func (l *memoryListener) DialContext(ctx context.Context, network, addr string) (net.Conn, error) {
server, client := net.Pipe()
select {
case <-ctx.Done():
return nil, &net.OpError{Op: "dial", Net: l.addr.Network(), Err: ctx.Err()}
case l.conns <- server:
return client, nil
case <-l.closed:
return nil, &net.OpError{Op: "dial", Net: l.addr.Network(), Err: errListenerClosed}
}
}
type memoryAddr string
// Network implements net.Addr.
func (memoryAddr) Network() string { return "memory" }
// String implements io.Stringer, returning a value that matches the
// certificates used by net/http/httptest.
func (a memoryAddr) String() string { return string(a) }
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