blob: ad7994532d691587702565f2c1df72c249bc454a [file] [log] [blame]
// Copyright 2019 The LUCI 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 streamclient
import (
"io"
"os"
"go.chromium.org/luci/logdog/client/butlerlib/streamproto"
)
// Similar to ioutil.Discard, but also implements Close and WriteDatagram.
type nullWriterT int
var nullWriter interface {
DatagramStream
io.Writer
} = nullWriterT(0)
func (nullWriterT) Write(data []byte) (int, error) { return len(data), nil }
func (nullWriterT) WriteDatagram(dg []byte) error { return nil }
func (nullWriterT) Close() error { return nil }
type nullDialerT int
var nullDialer dialer = (nullDialerT)(0)
func (nullDialerT) DialDgramStream(streamproto.Flags) (DatagramStream, error) { return nullWriter, nil }
func (nullDialerT) DialStream(forProcess bool, f streamproto.Flags) (io.WriteCloser, error) {
if forProcess {
return os.Create(os.DevNull)
}
return nullWriter, nil
}
func init() {
protocolRegistry["null"] = func(string) (dialer, error) { return nullDialer, nil }
}