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package fasthttputil
import (
"fmt"
"net"
"sync"
)
// InmemoryListener provides in-memory dialer<->net.Listener implementation.
//
// It may be used either for fast in-process client<->server communcations
// without network stack overhead or for client<->server tests.
type InmemoryListener struct {
lock sync.Mutex
closed bool
conns chan net.Conn
}
// NewInmemoryListener returns new in-memory dialer<->net.Listener.
func NewInmemoryListener() *InmemoryListener {
return &InmemoryListener{
conns: make(chan net.Conn, 1024),
}
}
// Accept implements net.Listener's Accept.
//
// It is safe calling Accept from concurrently running goroutines.
//
// Accept returns new connection per each Dial call.
func (ln *InmemoryListener) Accept() (net.Conn, error) {
c, ok := <-ln.conns
if !ok {
return nil, fmt.Errorf("InmemoryListener is already closed: use of closed network connection")
}
return c, nil
}
// Close implements net.Listener's Close.
func (ln *InmemoryListener) Close() error {
var err error
ln.lock.Lock()
if !ln.closed {
close(ln.conns)
ln.closed = true
} else {
err = fmt.Errorf("InmemoryListener is already closed")
}
ln.lock.Unlock()
return err
}
// Addr implements net.Listener's Addr.
func (ln *InmemoryListener) Addr() net.Addr {
return &net.UnixAddr{
Name: "InmemoryListener",
Net: "memory",
}
}
// Dial creates new client<->server connection, enqueues server side
// of the connection to Accept and returns client side of the connection.
//
// It is safe calling Dial from concurrently running goroutines.
func (ln *InmemoryListener) Dial() (net.Conn, error) {
pc := NewPipeConns()
cConn := pc.Conn1()
sConn := pc.Conn2()
ln.lock.Lock()
if !ln.closed {
ln.conns <- sConn
} else {
sConn.Close()
cConn.Close()
cConn = nil
}
ln.lock.Unlock()
if cConn == nil {
return nil, fmt.Errorf("InmemoryListener is already closed")
}
return cConn, nil
}
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