mirror of
https://github.com/k3s-io/k3s.git
synced 2024-06-07 19:41:36 +00:00
42 lines
1.6 KiB
Go
42 lines
1.6 KiB
Go
/*
|
|
Copyright 2018 The Kubernetes 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 remotecommand
|
|
|
|
import (
|
|
"io"
|
|
)
|
|
|
|
// readerWrapper delegates to an io.Reader so that only the io.Reader interface is implemented,
|
|
// to keep io.Copy from doing things we don't want when copying from the reader to the data stream.
|
|
//
|
|
// If the Stdin io.Reader provided to remotecommand implements a WriteTo function (like bytes.Buffer does[1]),
|
|
// io.Copy calls that method[2] to attempt to write the entire buffer to the stream in one call.
|
|
// That results in an oversized call to spdystream.Stream#Write [3],
|
|
// which results in a single oversized data frame[4] that is too large.
|
|
//
|
|
// [1] https://golang.org/pkg/bytes/#Buffer.WriteTo
|
|
// [2] https://golang.org/pkg/io/#Copy
|
|
// [3] https://github.com/kubernetes/kubernetes/blob/90295640ef87db9daa0144c5617afe889e7992b2/vendor/github.com/docker/spdystream/stream.go#L66-L73
|
|
// [4] https://github.com/kubernetes/kubernetes/blob/90295640ef87db9daa0144c5617afe889e7992b2/vendor/github.com/docker/spdystream/spdy/write.go#L302-L304
|
|
type readerWrapper struct {
|
|
reader io.Reader
|
|
}
|
|
|
|
func (r readerWrapper) Read(p []byte) (int, error) {
|
|
return r.reader.Read(p)
|
|
}
|