mirror of
https://github.com/restic/restic.git
synced 2024-08-23 04:40:46 +02:00
198 lines
3.5 KiB
Go
198 lines
3.5 KiB
Go
package restic
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import (
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"fmt"
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"sync"
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"time"
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)
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type Progress struct {
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OnStart func()
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OnUpdate ProgressFunc
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OnDone ProgressFunc
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fnM sync.Mutex
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cur Stat
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curM sync.Mutex
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start time.Time
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c *time.Ticker
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cancel chan struct{}
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o sync.Once
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d time.Duration
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running bool
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}
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type Stat struct {
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Files uint64
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Dirs uint64
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Bytes uint64
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Trees uint64
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Blobs uint64
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}
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type ProgressFunc func(s Stat, runtime time.Duration, ticker bool)
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// NewProgress returns a new progress reporter. When Start() called, the
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// function OnStart is executed once. Afterwards the function OnUpdate is
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// called when new data arrives or at least every d interval. The function
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// OnDone is called when Done() is called. Both functions are called
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// synchronously and can use shared state.
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func NewProgress(d time.Duration) *Progress {
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return &Progress{d: d}
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}
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// Start runs resets and runs the progress reporter.
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func (p *Progress) Start() {
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if p == nil || p.running {
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return
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}
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p.o = sync.Once{}
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p.cancel = make(chan struct{})
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p.running = true
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p.Reset()
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p.start = time.Now()
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p.c = time.NewTicker(p.d)
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if p.OnStart != nil {
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p.OnStart()
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}
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go p.reporter()
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}
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// Report adds the statistics from s to the current state and tries to report
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// the accumulated statistics via the feedback channel.
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func (p *Progress) Report(s Stat) {
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if p == nil {
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return
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}
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if !p.running {
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panic("reporting in a non-running Progress")
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}
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p.curM.Lock()
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p.cur.Add(s)
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cur := p.cur
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p.curM.Unlock()
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// update progress
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if p.OnUpdate != nil {
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p.fnM.Lock()
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p.OnUpdate(cur, time.Since(p.start), false)
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p.fnM.Unlock()
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}
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}
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// Report a file with the given size.
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func (p *Progress) ReportFile(size uint64) {
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p.Report(Stat{Files: 1, Bytes: size})
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}
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// Report a directory.
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func (p *Progress) ReportDir() {
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p.Report(Stat{Dirs: 1})
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}
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func (p *Progress) reporter() {
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if p == nil {
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return
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}
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for {
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select {
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case <-p.c.C:
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p.curM.Lock()
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cur := p.cur
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p.curM.Unlock()
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if p.OnUpdate != nil {
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p.fnM.Lock()
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p.OnUpdate(cur, time.Since(p.start), true)
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p.fnM.Unlock()
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}
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case <-p.cancel:
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p.c.Stop()
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return
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}
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}
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}
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// Reset resets all statistic counters to zero.
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func (p *Progress) Reset() {
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if p == nil {
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return
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}
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if !p.running {
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panic("resetting a non-running Progress")
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}
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p.curM.Lock()
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p.cur = Stat{}
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p.curM.Unlock()
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}
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// Done closes the progress report.
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func (p *Progress) Done() {
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if p == nil || !p.running {
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return
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}
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if p.running {
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p.running = false
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p.o.Do(func() {
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close(p.cancel)
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})
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cur := p.cur
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if p.OnDone != nil {
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p.fnM.Lock()
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p.OnDone(cur, time.Since(p.start), false)
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p.fnM.Unlock()
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}
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}
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}
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// Current returns the current stat value.
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func (p *Progress) Current() Stat {
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p.curM.Lock()
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s := p.cur
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p.curM.Unlock()
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return s
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}
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// Add accumulates other into s.
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func (s *Stat) Add(other Stat) {
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s.Bytes += other.Bytes
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s.Dirs += other.Dirs
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s.Files += other.Files
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s.Trees += other.Trees
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s.Blobs += other.Blobs
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}
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func (s Stat) String() string {
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b := float64(s.Bytes)
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var str string
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switch {
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case s.Bytes > 1<<40:
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str = fmt.Sprintf("%.3f TiB", b/(1<<40))
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case s.Bytes > 1<<30:
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str = fmt.Sprintf("%.3f GiB", b/(1<<30))
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case s.Bytes > 1<<20:
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str = fmt.Sprintf("%.3f MiB", b/(1<<20))
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case s.Bytes > 1<<10:
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str = fmt.Sprintf("%.3f KiB", b/(1<<10))
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default:
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str = fmt.Sprintf("%dB", s.Bytes)
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}
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return fmt.Sprintf("Stat(%d files, %d dirs, %v trees, %v blobs, %v)",
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s.Files, s.Dirs, s.Trees, s.Blobs, str)
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}
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