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43 lines
772 B
Go
43 lines
772 B
Go
// Copyright 2016 The Noms Authors. All rights reserved.
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// Licensed under the Apache License, version 2.0:
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// http://www.apache.org/licenses/LICENSE-2.0
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// Package progressreader provides an io.Reader that reports progress to a callback
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package progressreader
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import (
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"io"
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)
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type Callback func(seen uint64)
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func New(inner io.Reader, cb Callback) io.Reader {
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return &reader{
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inner,
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uint64(0),
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uint64(0),
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cb,
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}
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}
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type reader struct {
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inner io.Reader
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seen uint64
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lastMult uint64
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cb Callback
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}
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const reportFreq = 2 << 19 // 1 MB
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func (r *reader) Read(p []byte) (n int, err error) {
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mult := uint64(r.seen / reportFreq)
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if mult > r.lastMult {
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r.cb(r.seen)
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r.lastMult = mult
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}
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n, err = r.inner.Read(p)
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r.seen += uint64(n)
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return
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}
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