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meter.go
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package progress
import (
"fmt"
"os"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/olekukonko/ts"
)
// ProgressMeter provides a progress bar type output for the TransferQueue. It
// is given an estimated file count and size up front and tracks the number of
// files and bytes transferred as well as the number of files and bytes that
// get skipped because the transfer is unnecessary.
type ProgressMeter struct {
finishedFiles int64 // int64s must come first for struct alignment
skippedFiles int64
transferringFiles int64
estimatedBytes int64
currentBytes int64
skippedBytes int64
started int32
estimatedFiles int32
startTime time.Time
finished chan interface{}
logger *progressLogger
fileIndex map[string]int64 // Maps a file name to its transfer number
fileIndexMutex *sync.Mutex
dryRun bool
}
// NewProgressMeter creates a new ProgressMeter for the number and size of
// files given.
func NewProgressMeter(estFiles int, estBytes int64, dryRun bool, logPath string) *ProgressMeter {
logger, err := newProgressLogger(logPath)
if err != nil {
fmt.Fprintf(os.Stderr, "Error creating progress logger: %s\n", err)
}
return &ProgressMeter{
logger: logger,
startTime: time.Now(),
fileIndex: make(map[string]int64),
fileIndexMutex: &sync.Mutex{},
finished: make(chan interface{}),
estimatedFiles: int32(estFiles),
estimatedBytes: estBytes,
dryRun: dryRun,
}
}
func (p *ProgressMeter) Start() {
if atomic.SwapInt32(&p.started, 1) == 0 {
go p.writer()
}
}
// Add tells the progress meter that a transferring file is being added to the
// TransferQueue.
func (p *ProgressMeter) Add(name string) {
idx := atomic.AddInt64(&p.transferringFiles, 1)
p.fileIndexMutex.Lock()
p.fileIndex[name] = idx
p.fileIndexMutex.Unlock()
}
// Skip tells the progress meter that a file of size `size` is being skipped
// because the transfer is unnecessary.
func (p *ProgressMeter) Skip(size int64) {
atomic.AddInt64(&p.skippedFiles, 1)
atomic.AddInt64(&p.skippedBytes, size)
// Reduce bytes and files so progress easier to parse
atomic.AddInt32(&p.estimatedFiles, -1)
atomic.AddInt64(&p.estimatedBytes, -size)
}
// TransferBytes increments the number of bytes transferred
func (p *ProgressMeter) TransferBytes(direction, name string, read, total int64, current int) {
atomic.AddInt64(&p.currentBytes, int64(current))
p.logBytes(direction, name, read, total)
}
// FinishTransfer increments the finished transfer count
func (p *ProgressMeter) FinishTransfer(name string) {
atomic.AddInt64(&p.finishedFiles, 1)
p.fileIndexMutex.Lock()
delete(p.fileIndex, name)
p.fileIndexMutex.Unlock()
}
// Finish shuts down the ProgressMeter
func (p *ProgressMeter) Finish() {
close(p.finished)
p.update()
p.logger.Close()
if !p.dryRun && p.estimatedBytes > 0 {
fmt.Fprintf(os.Stdout, "\n")
}
}
func (p *ProgressMeter) logBytes(direction, name string, read, total int64) {
p.fileIndexMutex.Lock()
idx := p.fileIndex[name]
p.fileIndexMutex.Unlock()
line := fmt.Sprintf("%s %d/%d %d/%d %s\n", direction, idx, p.estimatedFiles, read, total, name)
if err := p.logger.Write([]byte(line)); err != nil {
p.logger.Shutdown()
}
}
func (p *ProgressMeter) writer() {
p.update()
for {
select {
case <-p.finished:
return
case <-time.After(time.Millisecond * 200):
p.update()
}
}
}
func (p *ProgressMeter) update() {
if p.dryRun || (p.estimatedFiles == 0 && p.skippedFiles == 0) {
return
}
width := 80 // default to 80 chars wide if ts.GetSize() fails
size, err := ts.GetSize()
if err == nil {
width = size.Col()
}
// (%d of %d files, %d skipped) %f B / %f B, %f B skipped
// skipped counts only show when > 0
out := fmt.Sprintf("\rGit LFS: (%d of %d files", p.finishedFiles, p.estimatedFiles)
if p.skippedFiles > 0 {
out += fmt.Sprintf(", %d skipped", p.skippedFiles)
}
out += fmt.Sprintf(") %s / %s", formatBytes(p.currentBytes), formatBytes(p.estimatedBytes))
if p.skippedBytes > 0 {
out += fmt.Sprintf(", %s skipped", formatBytes(p.skippedBytes))
}
padlen := width - len(out)
if 0 < padlen {
out += strings.Repeat(" ", padlen)
}
fmt.Fprintf(os.Stdout, out)
}
func formatBytes(i int64) string {
switch {
case i > 1099511627776:
return fmt.Sprintf("%#0.2f TB", float64(i)/1099511627776)
case i > 1073741824:
return fmt.Sprintf("%#0.2f GB", float64(i)/1073741824)
case i > 1048576:
return fmt.Sprintf("%#0.2f MB", float64(i)/1048576)
case i > 1024:
return fmt.Sprintf("%#0.2f KB", float64(i)/1024)
}
return fmt.Sprintf("%d B", i)
}