fdef567da6
Before this change, using -P occasionally deadlocked on the progress mutex and the stats mutex since they call each other. This is fixed by shortening the locking window in the progress routine so as not to include the stats calculation.
131 lines
2.7 KiB
Go
131 lines
2.7 KiB
Go
// Show the dynamic progress bar
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package cmd
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import (
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"bytes"
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"fmt"
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"os"
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"strings"
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"sync"
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"time"
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"github.com/rclone/rclone/fs"
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"github.com/rclone/rclone/fs/accounting"
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"github.com/rclone/rclone/fs/log"
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"golang.org/x/crypto/ssh/terminal"
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)
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const (
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// interval between progress prints
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defaultProgressInterval = 500 * time.Millisecond
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// time format for logging
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logTimeFormat = "2006-01-02 15:04:05"
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)
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// startProgress starts the progress bar printing
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//
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// It returns a func which should be called to stop the stats.
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func startProgress() func() {
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err := initTerminal()
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if err != nil {
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fs.Errorf(nil, "Failed to start progress: %v", err)
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return func() {}
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}
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stopStats := make(chan struct{})
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oldLogPrint := fs.LogPrint
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if !log.Redirected() {
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// Intercept the log calls if not logging to file or syslog
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fs.LogPrint = func(level fs.LogLevel, text string) {
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printProgress(fmt.Sprintf("%s %-6s: %s", time.Now().Format(logTimeFormat), level, text))
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}
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}
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var wg sync.WaitGroup
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wg.Add(1)
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go func() {
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defer wg.Done()
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progressInterval := defaultProgressInterval
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if ShowStats() && *statsInterval > 0 {
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progressInterval = *statsInterval
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}
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ticker := time.NewTicker(progressInterval)
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for {
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select {
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case <-ticker.C:
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printProgress("")
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case <-stopStats:
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ticker.Stop()
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printProgress("")
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fs.LogPrint = oldLogPrint
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fmt.Println("")
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return
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}
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}
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}()
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return func() {
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close(stopStats)
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wg.Wait()
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}
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}
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// VT100 codes
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const (
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eraseLine = "\x1b[2K"
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moveToStartOfLine = "\x1b[0G"
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moveUp = "\x1b[A"
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)
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// state for the progress printing
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var (
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nlines = 0 // number of lines in the previous stats block
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progressMu sync.Mutex
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)
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// printProgress prints the progress with an optional log
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func printProgress(logMessage string) {
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var buf bytes.Buffer
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w, h, err := terminal.GetSize(int(os.Stdout.Fd()))
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if err != nil {
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w, h = 80, 25
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}
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_ = h
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stats := strings.TrimSpace(accounting.GlobalStats().String())
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logMessage = strings.TrimSpace(logMessage)
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out := func(s string) {
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buf.WriteString(s)
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}
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// Lock from here to prevent terminal corruption
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progressMu.Lock()
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progressMu.Unlock()
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if logMessage != "" {
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out("\n")
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out(moveUp)
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}
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// Move to the start of the block we wrote erasing all the previous lines
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for i := 0; i < nlines-1; i++ {
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out(eraseLine)
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out(moveUp)
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}
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out(eraseLine)
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out(moveToStartOfLine)
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if logMessage != "" {
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out(eraseLine)
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out(logMessage + "\n")
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}
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fixedLines := strings.Split(stats, "\n")
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nlines = len(fixedLines)
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for i, line := range fixedLines {
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if len(line) > w {
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line = line[:w]
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}
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out(line)
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if i != nlines-1 {
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out("\n")
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}
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}
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writeToTerminal(buf.Bytes())
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}
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