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package drive
import (
"io"
"fmt"
"time"
)
type Progress struct {
Writer io.Writer
Reader io.Reader
Size int64
progress int64
rate int64
rateProgress int64
rateUpdated time.Time
updated time.Time
done bool
}
func (self *Progress) Read(p []byte) (int, error) {
// Read
n, err := self.Reader.Read(p)
now := time.Now()
isLast := err != nil
// Increment progress
newProgress := self.progress + int64(n)
self.progress = newProgress
// Initialize rate state
if self.rateUpdated.IsZero() {
self.rateUpdated = now
self.rateProgress = newProgress
}
// Update rate every 3 seconds
if self.rateUpdated.Add(time.Second * 3).Before(now) {
self.rate = calcRate(newProgress - self.rateProgress, self.rateUpdated, now)
self.rateUpdated = now
self.rateProgress = newProgress
}
// Draw progress every second
if self.updated.Add(time.Second).Before(now) || isLast {
self.Draw(isLast)
}
// Update last draw time
self.updated = now
// Mark as done if error occurs
self.done = isLast
return n, err
}
func (self *Progress) Draw(isLast bool) {
if self.done {
return
}
// Clear line
fmt.Fprintf(self.Writer, "\r%50s", "")
// Print progress
fmt.Fprintf(self.Writer, "\r%s/%s", formatSize(self.progress, false), formatSize(self.Size, false))
// Print rate
if self.rate > 0 {
fmt.Fprintf(self.Writer, ", Rate: %s/s", formatSize(self.rate, false))
}
if isLast {
fmt.Fprintf(self.Writer, "\n")
}
}
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