66 lines
1.7 KiB
Go
66 lines
1.7 KiB
Go
package progress // import "github.com/docker/docker/pkg/progress"
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import (
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"io"
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"time"
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"golang.org/x/time/rate"
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)
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// Reader is a Reader with progress bar.
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type Reader struct {
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in io.ReadCloser // Stream to read from
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out Output // Where to send progress bar to
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size int64
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current int64
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lastUpdate int64
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id string
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action string
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rateLimiter *rate.Limiter
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}
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// NewProgressReader creates a new ProgressReader.
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func NewProgressReader(in io.ReadCloser, out Output, size int64, id, action string) *Reader {
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return &Reader{
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in: in,
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out: out,
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size: size,
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id: id,
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action: action,
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rateLimiter: rate.NewLimiter(rate.Every(100*time.Millisecond), 1),
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}
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}
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func (p *Reader) Read(buf []byte) (n int, err error) {
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read, err := p.in.Read(buf)
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p.current += int64(read)
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updateEvery := int64(1024 * 512) // 512kB
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if p.size > 0 {
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// Update progress for every 1% read if 1% < 512kB
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if increment := int64(0.01 * float64(p.size)); increment < updateEvery {
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updateEvery = increment
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}
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}
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if p.current-p.lastUpdate > updateEvery || err != nil {
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p.updateProgress(err != nil && read == 0)
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p.lastUpdate = p.current
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}
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return read, err
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}
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// Close closes the progress reader and its underlying reader.
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func (p *Reader) Close() error {
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if p.current < p.size {
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// print a full progress bar when closing prematurely
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p.current = p.size
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p.updateProgress(false)
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}
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return p.in.Close()
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}
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func (p *Reader) updateProgress(last bool) {
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if last || p.current == p.size || p.rateLimiter.Allow() {
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p.out.WriteProgress(Progress{ID: p.id, Action: p.action, Current: p.current, Total: p.size, LastUpdate: last})
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}
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}
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