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40 lines
1.7 KiB
Go
40 lines
1.7 KiB
Go
// Copyright 2019 Yunion
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package remotecommand
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import (
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"io"
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)
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// readerWrapper delegates to an io.Reader so that only the io.Reader interface is implemented,
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// to keep io.Copy from doing things we don't want when copying from the reader to the data stream.
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//
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// If the Stdin io.Reader provided to remotecommand implements a WriteTo function (like bytes.Buffer does[1]),
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// io.Copy calls that method[2] to attempt to write the entire buffer to the stream in one call.
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// That results in an oversized call to spdystream.Stream#Write [3],
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// which results in a single oversized data frame[4] that is too large.
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//
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// [1] https://golang.org/pkg/bytes/#Buffer.WriteTo
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// [2] https://golang.org/pkg/io/#Copy
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// [3] https://github.com/kubernetes/kubernetes/blob/90295640ef87db9daa0144c5617afe889e7992b2/vendor/github.com/docker/spdystream/stream.go#L66-L73
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// [4] https://github.com/kubernetes/kubernetes/blob/90295640ef87db9daa0144c5617afe889e7992b2/vendor/github.com/docker/spdystream/spdy/write.go#L302-L304
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type readerWrapper struct {
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reader io.Reader
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}
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func (r readerWrapper) Read(p []byte) (int, error) {
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return r.reader.Read(p)
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}
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