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package core
import (
"context"
"net"
"strings"
"sync"
"syscall"
)
// Listen is a wrapper around net.Listen. If addr cannot be split in two
// parts around the first colon found, Listen will try to create a UNIX
// or TCP net.Listener depending on whether addr contains a slash.
func Listen(addr string) (net.Listener, error) {
if fields := strings.SplitN(addr, ":", 2); len(fields) == 2 {
return net.Listen(fields[0], fields[1])
}
if strings.ContainsRune(addr, '/') {
return net.Listen("unix", addr)
}
return net.Listen("tcp", addr)
}
// PipeListener is a net.Listener that works over a pipe. It provides
// dialer functions that can be used in an HTTP client or gRPC options.
//
// Its zero value is safe to use. PipeListener must not be copied after
// its first use.
type PipeListener struct {
conns chan net.Conn
done chan struct{}
closeOnce sync.Once
initOnce sync.Once
}
var _ net.Listener = &PipeListener{}
func (p *PipeListener) Accept() (net.Conn, error) {
p.initOnce.Do(p.init)
select {
case conn := <-p.conns:
return conn, nil
case <-p.done:
return nil, syscall.EINVAL
}
}
func (p *PipeListener) Addr() net.Addr { return pipeListenerAddr{} }
func (p *PipeListener) Close() error {
p.initOnce.Do(p.init)
p.closeOnce.Do(func() { close(p.done) })
return nil
}
func (p *PipeListener) Dial(_, _ string) (net.Conn, error) {
return p.DialContext(context.Background(), "", "")
}
func (p *PipeListener) DialContext(ctx context.Context, _, _ string) (net.Conn, error) {
p.initOnce.Do(p.init)
s, c := net.Pipe()
select {
case p.conns <- s:
return c, nil
case <-p.done:
return nil, syscall.ECONNREFUSED
case <-ctx.Done():
return nil, ctx.Err()
}
}
func (p *PipeListener) DialContextGRPC(ctx context.Context, _ string) (net.Conn, error) {
return p.DialContext(ctx, "", "")
}
func (p *PipeListener) init() {
p.conns = make(chan net.Conn)
p.done = make(chan struct{})
}
type pipeListenerAddr struct{}
func (pipeListenerAddr) Network() string { return "pipe" }
func (pipeListenerAddr) String() string { return "pipe" }
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