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progress.go
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progress.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package artifacts
import (
"bytes"
"fmt"
"io"
"sync/atomic"
"github.com/dustin/go-humanize"
"namespacelabs.dev/foundation/std/tasks"
)
type ProgressReader interface {
io.ReadCloser
tasks.ActionProgress
}
type ProgressWriter interface {
io.WriteCloser
tasks.ActionProgress
WrapReader(io.ReadCloser) io.ReadCloser
WrapBytesAsReader([]byte) io.ReadCloser
}
type progressWriter struct {
contentLength uint64
closer func() error
total uint64
}
type progressReader struct {
pw *progressWriter
reader io.ReadCloser
}
func NewProgressReader(r io.ReadCloser, contentLength uint64) ProgressReader {
return &progressReader{
pw: &progressWriter{contentLength: contentLength, closer: r.Close},
reader: r,
}
}
func NewProgressWriter(contentLength uint64, closer func() error) ProgressWriter {
return &progressWriter{contentLength: contentLength, closer: closer}
}
func (p *progressWriter) Write(buf []byte) (n int, err error) {
p.Update(uint64(len(buf)))
return len(buf), nil
}
func (p *progressWriter) Update(written uint64) {
atomic.AddUint64(&p.total, written)
}
func (p *progressWriter) Close() error {
if p.closer != nil {
return p.closer()
}
return nil
}
func (p *progressWriter) FormatProgress() string {
v := atomic.LoadUint64(&p.total)
cl := p.contentLength
if cl == 0 {
return humanize.Bytes(v)
}
percent := float64(v) / float64(cl) * 100
return fmt.Sprintf("%.2f%% (%s of %s)", percent, humanize.Bytes(v), humanize.Bytes(cl))
}
func (p *progressWriter) WrapReader(r io.ReadCloser) io.ReadCloser {
return &progressReader{pw: p, reader: r}
}
func (p *progressWriter) WrapBytesAsReader(content []byte) io.ReadCloser {
return p.WrapReader(io.NopCloser(bytes.NewReader(content)))
}
func (p *progressReader) Read(buf []byte) (int, error) {
n, err := p.reader.Read(buf)
p.pw.Update(uint64(n))
return n, err
}
func (p *progressReader) Close() error {
return p.pw.Close()
}
func (p *progressReader) FormatProgress() string {
return p.pw.FormatProgress()
}
func MaybeUpdateSkippedBytes(r io.ReadCloser, count int64) {
if p, ok := r.(*progressReader); ok {
p.pw.Update(uint64(count))
}
}