mirror of
https://github.com/gravitational/teleport
synced 2024-10-21 01:34:01 +00:00
54 lines
1.4 KiB
Go
54 lines
1.4 KiB
Go
/*
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Copyright 2022 Gravitational, Inc.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package utils
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// CaptureNBytesWriter is an io.Writer thats captures up to first n bytes
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// of the incoming data in memory, and then it ignores the rest of the incoming
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// data.
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type CaptureNBytesWriter struct {
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capture []byte
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maxRemaining int
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}
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// NewCaptureNBytesWriter creates a new CaptureNBytesWriter.
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func NewCaptureNBytesWriter(max int) *CaptureNBytesWriter {
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return &CaptureNBytesWriter{
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maxRemaining: max,
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}
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}
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// Write implements io.Writer.
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func (w *CaptureNBytesWriter) Write(p []byte) (int, error) {
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if w.maxRemaining > 0 {
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capture := p[:]
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if len(capture) > w.maxRemaining {
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capture = capture[:w.maxRemaining]
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}
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w.capture = append(w.capture, capture...)
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w.maxRemaining -= len(capture)
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}
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// Always pretend to be successful.
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return len(p), nil
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}
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// Bytes returns all captured bytes.
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func (w CaptureNBytesWriter) Bytes() []byte {
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return w.capture
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}
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