57 lines
1.6 KiB
Go
57 lines
1.6 KiB
Go
package utils
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import (
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"io"
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"time"
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)
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// Reader with progress bar
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type progressReader struct {
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reader io.ReadCloser // Stream to read from
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output io.Writer // Where to send progress bar to
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progress JSONProgress
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// readTotal int // Expected stream length (bytes)
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// readProgress int // How much has been read so far (bytes)
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lastUpdate int // How many bytes read at least update
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ID string
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action string
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// template string // Template to print. Default "%v/%v (%v)"
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sf *StreamFormatter
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newLine bool
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}
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func (r *progressReader) Read(p []byte) (n int, err error) {
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read, err := io.ReadCloser(r.reader).Read(p)
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r.progress.Current += read
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updateEvery := 1024 * 512 //512kB
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if r.progress.Total > 0 {
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// Update progress for every 1% read if 1% < 512kB
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if increment := int(0.01 * float64(r.progress.Total)); increment < updateEvery {
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updateEvery = increment
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}
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}
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if r.progress.Current-r.lastUpdate > updateEvery || err != nil {
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r.output.Write(r.sf.FormatProgress(r.ID, r.action, &r.progress))
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r.lastUpdate = r.progress.Current
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}
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// Send newline when complete
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if r.newLine && err != nil {
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r.output.Write(r.sf.FormatStatus("", ""))
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}
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return read, err
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}
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func (r *progressReader) Close() error {
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return io.ReadCloser(r.reader).Close()
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}
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func ProgressReader(r io.ReadCloser, size int, output io.Writer, sf *StreamFormatter, newline bool, ID, action string) *progressReader {
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return &progressReader{
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reader: r,
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output: NewWriteFlusher(output),
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ID: ID,
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action: action,
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progress: JSONProgress{Total: size, Start: time.Now().UTC().Unix()},
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sf: sf,
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newLine: newline,
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}
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}
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