Merge pull request 1944 from mholt/jsonprogress

backup: Support --json flag by streaming JSON to report progress

cmd/restic/cmd_backup.go

@@ -5,6 +5,7 @@ import (
 	"bytes"
 	"context"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"os"
 	"path/filepath"
@@ -23,6 +24,7 @@ import (
 	"github.com/restic/restic/internal/restic"
 	"github.com/restic/restic/internal/textfile"
 	"github.com/restic/restic/internal/ui"
+	"github.com/restic/restic/internal/ui/jsonstatus"
 	"github.com/restic/restic/internal/ui/termstatus"
 )
 
@@ -395,15 +397,43 @@ func runBackup(opts BackupOptions, gopts GlobalOptions, term *termstatus.Termina
 
 	var t tomb.Tomb
 
-	if gopts.verbosity >= 2 {
+	if gopts.verbosity >= 2 && !gopts.JSON {
 		term.Print("open repository\n")
 	}
+
 	repo, err := OpenRepository(gopts)
 	if err != nil {
 		return err
 	}
 
-	p := ui.NewBackup(term, gopts.verbosity)
+	type ArchiveProgressReporter interface {
+		CompleteItem(item string, previous, current *restic.Node, s archiver.ItemStats, d time.Duration)
+		StartFile(filename string)
+		CompleteBlob(filename string, bytes uint64)
+		ScannerError(item string, fi os.FileInfo, err error) error
+		ReportTotal(item string, s archiver.ScanStats)
+		SetMinUpdatePause(d time.Duration)
+		Run(ctx context.Context) error
+		Error(item string, fi os.FileInfo, err error) error
+		Finish(snapshotID restic.ID)
+
+		// ui.StdioWrapper
+		Stdout() io.WriteCloser
+		Stderr() io.WriteCloser
+
+		// ui.Message
+		E(msg string, args ...interface{})
+		P(msg string, args ...interface{})
+		V(msg string, args ...interface{})
+		VV(msg string, args ...interface{})
+	}
+
+	var p ArchiveProgressReporter
+	if gopts.JSON {
+		p = jsonstatus.NewBackup(term, gopts.verbosity)
+	} else {
+		p = ui.NewBackup(term, gopts.verbosity)
+	}
 
 	// use the terminal for stdout/stderr
 	prevStdout, prevStderr := gopts.stdout, gopts.stderr
@@ -418,13 +448,15 @@ func runBackup(opts BackupOptions, gopts GlobalOptions, term *termstatus.Termina
 			if fps > 60 {
 				fps = 60
 			}
-			p.MinUpdatePause = time.Second / time.Duration(fps)
+			p.SetMinUpdatePause(time.Second / time.Duration(fps))
 		}
 	}
 
 	t.Go(func() error { return p.Run(t.Context(gopts.ctx)) })
 
-	p.V("lock repository")
+	if !gopts.JSON {
+		p.V("lock repository")
+	}
 	lock, err := lockRepo(repo)
 	defer unlockRepo(lock)
 	if err != nil {
@@ -443,7 +475,9 @@ func runBackup(opts BackupOptions, gopts GlobalOptions, term *termstatus.Termina
 		return err
 	}
 
-	p.V("load index files")
+	if !gopts.JSON {
+		p.V("load index files")
+	}
 	err = repo.LoadIndex(gopts.ctx)
 	if err != nil {
 		return err
@@ -454,7 +488,7 @@ func runBackup(opts BackupOptions, gopts GlobalOptions, term *termstatus.Termina
 		return err
 	}
 
-	if parentSnapshotID != nil {
+	if !gopts.JSON && parentSnapshotID != nil {
 		p.V("using parent snapshot %v\n", parentSnapshotID.Str())
 	}
 
@@ -478,7 +512,9 @@ func runBackup(opts BackupOptions, gopts GlobalOptions, term *termstatus.Termina
 
 	var targetFS fs.FS = fs.Local{}
 	if opts.Stdin {
-		p.V("read data from stdin")
+		if !gopts.JSON {
+			p.V("read data from stdin")
+		}
 		targetFS = &fs.Reader{
 			ModTime:    timeStamp,
 			Name:       opts.StdinFilename,
@@ -494,7 +530,9 @@ func runBackup(opts BackupOptions, gopts GlobalOptions, term *termstatus.Termina
 	sc.Error = p.ScannerError
 	sc.Result = p.ReportTotal
 
-	p.V("start scan on %v", targets)
+	if !gopts.JSON {
+		p.V("start scan on %v", targets)
+	}
 	t.Go(func() error { return sc.Scan(t.Context(gopts.ctx), targets) })
 
 	arch := archiver.New(repo, targetFS, archiver.Options{})
@@ -502,7 +540,7 @@ func runBackup(opts BackupOptions, gopts GlobalOptions, term *termstatus.Termina
 	arch.Select = selectFilter
 	arch.WithAtime = opts.WithAtime
 	arch.Error = p.Error
-	arch.CompleteItem = p.CompleteItemFn
+	arch.CompleteItem = p.CompleteItem
 	arch.StartFile = p.StartFile
 	arch.CompleteBlob = p.CompleteBlob
 
@@ -521,10 +559,14 @@ func runBackup(opts BackupOptions, gopts GlobalOptions, term *termstatus.Termina
 	uploader := archiver.IndexUploader{
 		Repository: repo,
 		Start: func() {
-			p.VV("uploading intermediate index")
+			if !gopts.JSON {
+				p.VV("uploading intermediate index")
+			}
 		},
 		Complete: func(id restic.ID) {
-			p.V("uploaded intermediate index %v", id.Str())
+			if !gopts.JSON {
+				p.V("uploaded intermediate index %v", id.Str())
+			}
 		},
 	}
 
@@ -532,14 +574,18 @@ func runBackup(opts BackupOptions, gopts GlobalOptions, term *termstatus.Termina
 		return uploader.Upload(gopts.ctx, t.Context(gopts.ctx), 30*time.Second)
 	})
 
-	p.V("start backup on %v", targets)
+	if !gopts.JSON {
+		p.V("start backup on %v", targets)
+	}
 	_, id, err := arch.Snapshot(gopts.ctx, targets, snapshotOpts)
 	if err != nil {
 		return errors.Fatalf("unable to save snapshot: %v", err)
 	}
 
-	p.Finish()
+	p.Finish(id)
-	p.P("snapshot %s saved\n", id.Str())
+	if !gopts.JSON {
+		p.P("snapshot %s saved\n", id.Str())
+	}
 
 	// cleanly shutdown all running goroutines
 	t.Kill(nil)

cmd/restic/global.go

@@ -377,7 +377,7 @@ func OpenRepository(opts GlobalOptions) (*repository.Repository, error) {
 		return nil, err
 	}
 
-	if stdoutIsTerminal() {
+	if stdoutIsTerminal() && !opts.JSON {
 		id := s.Config().ID
 		if len(id) > 8 {
 			id = id[:8]

internal/ui/backup.go

@@ -254,9 +254,9 @@ func formatBytes(c uint64) string {
 	}
 }
 
-// CompleteItemFn is the status callback function for the archiver when a
+// CompleteItem is the status callback function for the archiver when a
 // file/dir has been saved successfully.
-func (b *Backup) CompleteItemFn(item string, previous, current *restic.Node, s archiver.ItemStats, d time.Duration) {
+func (b *Backup) CompleteItem(item string, previous, current *restic.Node, s archiver.ItemStats, d time.Duration) {
 	b.summary.Lock()
 	b.summary.ItemStats.Add(s)
 	b.summary.Unlock()
@@ -349,7 +349,7 @@ func (b *Backup) ReportTotal(item string, s archiver.ScanStats) {
 }
 
 // Finish prints the finishing messages.
-func (b *Backup) Finish() {
+func (b *Backup) Finish(snapshotID restic.ID) {
 	close(b.finished)
 
 	b.P("\n")
@@ -365,3 +365,9 @@ func (b *Backup) Finish() {
 		formatDuration(time.Since(b.start)),
 	)
 }
+
+// SetMinUpdatePause sets b.MinUpdatePause. It satisfies the
+// ArchiveProgressReporter interface.
+func (b *Backup) SetMinUpdatePause(d time.Duration) {
+	b.MinUpdatePause = d
+}

internal/ui/jsonstatus/status.go

@@ -0,0 +1,420 @@
+package jsonstatus
+
+import (
+	"context"
+	"encoding/json"
+	"os"
+	"sort"
+	"sync"
+	"time"
+
+	"github.com/restic/restic/internal/archiver"
+	"github.com/restic/restic/internal/restic"
+	"github.com/restic/restic/internal/ui"
+	"github.com/restic/restic/internal/ui/termstatus"
+)
+
+type counter struct {
+	Files, Dirs, Bytes uint64
+}
+
+type fileWorkerMessage struct {
+	filename string
+	done     bool
+}
+
+// Backup reports progress for the `backup` command in JSON.
+type Backup struct {
+	*ui.Message
+	*ui.StdioWrapper
+
+	MinUpdatePause time.Duration
+
+	term  *termstatus.Terminal
+	v     uint
+	start time.Time
+
+	totalBytes uint64
+
+	totalCh     chan counter
+	processedCh chan counter
+	errCh       chan struct{}
+	workerCh    chan fileWorkerMessage
+	finished    chan struct{}
+
+	summary struct {
+		sync.Mutex
+		Files, Dirs struct {
+			New       uint
+			Changed   uint
+			Unchanged uint
+		}
+		archiver.ItemStats
+	}
+}
+
+// NewBackup returns a new backup progress reporter.
+func NewBackup(term *termstatus.Terminal, verbosity uint) *Backup {
+	return &Backup{
+		Message:      ui.NewMessage(term, verbosity),
+		StdioWrapper: ui.NewStdioWrapper(term),
+		term:         term,
+		v:            verbosity,
+		start:        time.Now(),
+
+		// limit to 60fps by default
+		MinUpdatePause: time.Second / 60,
+
+		totalCh:     make(chan counter),
+		processedCh: make(chan counter),
+		errCh:       make(chan struct{}),
+		workerCh:    make(chan fileWorkerMessage),
+		finished:    make(chan struct{}),
+	}
+}
+
+// Run regularly updates the status lines. It should be called in a separate
+// goroutine.
+func (b *Backup) Run(ctx context.Context) error {
+	var (
+		lastUpdate       time.Time
+		total, processed counter
+		errors           uint
+		started          bool
+		currentFiles     = make(map[string]struct{})
+		secondsRemaining uint64
+	)
+
+	t := time.NewTicker(time.Second)
+	defer t.Stop()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return nil
+		case <-b.finished:
+			started = false
+		case t, ok := <-b.totalCh:
+			if ok {
+				total = t
+				started = true
+			} else {
+				// scan has finished
+				b.totalCh = nil
+				b.totalBytes = total.Bytes
+			}
+		case s := <-b.processedCh:
+			processed.Files += s.Files
+			processed.Dirs += s.Dirs
+			processed.Bytes += s.Bytes
+			started = true
+		case <-b.errCh:
+			errors++
+			started = true
+		case m := <-b.workerCh:
+			if m.done {
+				delete(currentFiles, m.filename)
+			} else {
+				currentFiles[m.filename] = struct{}{}
+			}
+		case <-t.C:
+			if !started {
+				continue
+			}
+
+			if b.totalCh == nil {
+				secs := float64(time.Since(b.start) / time.Second)
+				todo := float64(total.Bytes - processed.Bytes)
+				secondsRemaining = uint64(secs / float64(processed.Bytes) * todo)
+			}
+		}
+
+		// limit update frequency
+		if time.Since(lastUpdate) < b.MinUpdatePause {
+			continue
+		}
+		lastUpdate = time.Now()
+
+		b.update(total, processed, errors, currentFiles, secondsRemaining)
+	}
+}
+
+// update updates the status lines.
+func (b *Backup) update(total, processed counter, errors uint, currentFiles map[string]struct{}, secs uint64) {
+	status := statusUpdate{
+		MessageType:      "status",
+		SecondsElapsed:   uint64(time.Since(b.start) / time.Second),
+		SecondsRemaining: secs,
+		TotalFiles:       total.Files,
+		FilesDone:        processed.Files,
+		TotalBytes:       total.Bytes,
+		BytesDone:        processed.Bytes,
+		ErrorCount:       errors,
+	}
+
+	if total.Bytes > 0 {
+		status.PercentDone = float64(processed.Bytes) / float64(total.Bytes)
+	}
+
+	for filename := range currentFiles {
+		status.CurrentFiles = append(status.CurrentFiles, filename)
+	}
+	sort.Sort(sort.StringSlice(status.CurrentFiles))
+
+	json.NewEncoder(b.StdioWrapper.Stdout()).Encode(status)
+}
+
+// ScannerError is the error callback function for the scanner, it prints the
+// error in verbose mode and returns nil.
+func (b *Backup) ScannerError(item string, fi os.FileInfo, err error) error {
+	json.NewEncoder(b.StdioWrapper.Stderr()).Encode(errorUpdate{
+		MessageType: "error",
+		Error:       err,
+		During:      "scan",
+		Item:        item,
+	})
+	return nil
+}
+
+// Error is the error callback function for the archiver, it prints the error and returns nil.
+func (b *Backup) Error(item string, fi os.FileInfo, err error) error {
+	json.NewEncoder(b.StdioWrapper.Stderr()).Encode(errorUpdate{
+		MessageType: "error",
+		Error:       err,
+		During:      "archival",
+		Item:        item,
+	})
+	b.errCh <- struct{}{}
+	return nil
+}
+
+// StartFile is called when a file is being processed by a worker.
+func (b *Backup) StartFile(filename string) {
+	b.workerCh <- fileWorkerMessage{
+		filename: filename,
+	}
+}
+
+// CompleteBlob is called for all saved blobs for files.
+func (b *Backup) CompleteBlob(filename string, bytes uint64) {
+	b.processedCh <- counter{Bytes: bytes}
+}
+
+// CompleteItem is the status callback function for the archiver when a
+// file/dir has been saved successfully.
+func (b *Backup) CompleteItem(item string, previous, current *restic.Node, s archiver.ItemStats, d time.Duration) {
+	b.summary.Lock()
+	b.summary.ItemStats.Add(s)
+	b.summary.Unlock()
+
+	if current == nil {
+		// error occurred, tell the status display to remove the line
+		b.workerCh <- fileWorkerMessage{
+			filename: item,
+			done:     true,
+		}
+		return
+	}
+
+	switch current.Type {
+	case "file":
+		b.processedCh <- counter{Files: 1}
+		b.workerCh <- fileWorkerMessage{
+			filename: item,
+			done:     true,
+		}
+	case "dir":
+		b.processedCh <- counter{Dirs: 1}
+	}
+
+	if current.Type == "dir" {
+		if previous == nil {
+			if b.v >= 3 {
+				json.NewEncoder(b.StdioWrapper.Stdout()).Encode(verboseUpdate{
+					MessageType:  "verbose_status",
+					Action:       "new",
+					Item:         item,
+					Duration:     d.Seconds(),
+					DataSize:     s.DataSize,
+					MetadataSize: s.TreeSize,
+				})
+			}
+			b.summary.Lock()
+			b.summary.Dirs.New++
+			b.summary.Unlock()
+			return
+		}
+
+		if previous.Equals(*current) {
+			if b.v >= 3 {
+				json.NewEncoder(b.StdioWrapper.Stdout()).Encode(verboseUpdate{
+					MessageType: "verbose_status",
+					Action:      "unchanged",
+					Item:        item,
+				})
+			}
+			b.summary.Lock()
+			b.summary.Dirs.Unchanged++
+			b.summary.Unlock()
+		} else {
+			if b.v >= 3 {
+				json.NewEncoder(b.StdioWrapper.Stdout()).Encode(verboseUpdate{
+					MessageType:  "verbose_status",
+					Action:       "modified",
+					Item:         item,
+					Duration:     d.Seconds(),
+					DataSize:     s.DataSize,
+					MetadataSize: s.TreeSize,
+				})
+			}
+			b.summary.Lock()
+			b.summary.Dirs.Changed++
+			b.summary.Unlock()
+		}
+
+	} else if current.Type == "file" {
+
+		b.workerCh <- fileWorkerMessage{
+			done:     true,
+			filename: item,
+		}
+
+		if previous == nil {
+			if b.v >= 3 {
+				json.NewEncoder(b.StdioWrapper.Stdout()).Encode(verboseUpdate{
+					MessageType: "verbose_status",
+					Action:      "new",
+					Item:        item,
+					Duration:    d.Seconds(),
+					DataSize:    s.DataSize,
+				})
+			}
+			b.summary.Lock()
+			b.summary.Files.New++
+			b.summary.Unlock()
+			return
+		}
+
+		if previous.Equals(*current) {
+			if b.v >= 3 {
+				json.NewEncoder(b.StdioWrapper.Stdout()).Encode(verboseUpdate{
+					MessageType: "verbose_status",
+					Action:      "unchanged",
+					Item:        item,
+				})
+			}
+			b.summary.Lock()
+			b.summary.Files.Unchanged++
+			b.summary.Unlock()
+		} else {
+			if b.v >= 3 {
+				json.NewEncoder(b.StdioWrapper.Stdout()).Encode(verboseUpdate{
+					MessageType: "verbose_status",
+					Action:      "modified",
+					Item:        item,
+					Duration:    d.Seconds(),
+					DataSize:    s.DataSize,
+				})
+			}
+			b.summary.Lock()
+			b.summary.Files.Changed++
+			b.summary.Unlock()
+		}
+	}
+}
+
+// ReportTotal sets the total stats up to now
+func (b *Backup) ReportTotal(item string, s archiver.ScanStats) {
+	select {
+	case b.totalCh <- counter{Files: uint64(s.Files), Dirs: uint64(s.Dirs), Bytes: s.Bytes}:
+	case <-b.finished:
+	}
+
+	if item == "" {
+		if b.v >= 2 {
+			json.NewEncoder(b.StdioWrapper.Stdout()).Encode(verboseUpdate{
+				MessageType: "status",
+				Action:      "scan_finished",
+				Duration:    time.Since(b.start).Seconds(),
+				DataSize:    s.Bytes,
+				TotalFiles:  s.Files,
+			})
+		}
+		close(b.totalCh)
+		return
+	}
+}
+
+// Finish prints the finishing messages.
+func (b *Backup) Finish(snapshotID restic.ID) {
+	close(b.finished)
+	json.NewEncoder(b.StdioWrapper.Stdout()).Encode(summaryOutput{
+		MessageType:         "summary",
+		FilesNew:            b.summary.Files.New,
+		FilesChanged:        b.summary.Files.Changed,
+		FilesUnmodified:     b.summary.Files.Unchanged,
+		DirsNew:             b.summary.Dirs.New,
+		DirsChanged:         b.summary.Dirs.Changed,
+		DirsUnmodified:      b.summary.Dirs.Unchanged,
+		DataBlobs:           b.summary.ItemStats.DataBlobs,
+		TreeBlobs:           b.summary.ItemStats.TreeBlobs,
+		DataAdded:           b.summary.ItemStats.DataSize + b.summary.ItemStats.TreeSize,
+		TotalFilesProcessed: b.summary.Files.New + b.summary.Files.Changed + b.summary.Files.Unchanged,
+		TotalBytesProcessed: b.totalBytes,
+		TotalDuration:       time.Since(b.start).Seconds(),
+		SnapshotID:          snapshotID.Str(),
+	})
+}
+
+// SetMinUpdatePause sets b.MinUpdatePause. It satisfies the
+// ArchiveProgressReporter interface.
+func (b *Backup) SetMinUpdatePause(d time.Duration) {
+	b.MinUpdatePause = d
+}
+
+type statusUpdate struct {
+	MessageType      string   `json:"message_type"` // "status"
+	SecondsElapsed   uint64   `json:"seconds_elapsed,omitempty"`
+	SecondsRemaining uint64   `json:"seconds_remaining,omitempty"`
+	PercentDone      float64  `json:"percent_done"`
+	TotalFiles       uint64   `json:"total_files,omitempty"`
+	FilesDone        uint64   `json:"files_done,omitempty"`
+	TotalBytes       uint64   `json:"total_bytes,omitempty"`
+	BytesDone        uint64   `json:"bytes_done,omitempty"`
+	ErrorCount       uint     `json:"error_count,omitempty"`
+	CurrentFiles     []string `json:"current_files,omitempty"`
+}
+
+type errorUpdate struct {
+	MessageType string `json:"message_type"` // "error"
+	Error       error  `json:"error"`
+	During      string `json:"during"`
+	Item        string `json:"item"`
+}
+
+type verboseUpdate struct {
+	MessageType  string  `json:"message_type"` // "verbose_status"
+	Action       string  `json:"action"`
+	Item         string  `json:"item"`
+	Duration     float64 `json:"duration"` // in seconds
+	DataSize     uint64  `json:"data_size"`
+	MetadataSize uint64  `json:"metadata_size"`
+	TotalFiles   uint    `json:"total_files"`
+}
+
+type summaryOutput struct {
+	MessageType         string  `json:"message_type"` // "summary"
+	FilesNew            uint    `json:"files_new"`
+	FilesChanged        uint    `json:"files_changed"`
+	FilesUnmodified     uint    `json:"files_unmodified"`
+	DirsNew             uint    `json:"dirs_new"`
+	DirsChanged         uint    `json:"dirs_changed"`
+	DirsUnmodified      uint    `json:"dirs_unmodified"`
+	DataBlobs           int     `json:"data_blobs"`
+	TreeBlobs           int     `json:"tree_blobs"`
+	DataAdded           uint64  `json:"data_added"`
+	TotalFilesProcessed uint    `json:"total_files_processed"`
+	TotalBytesProcessed uint64  `json:"total_bytes_processed"`
+	TotalDuration       float64 `json:"total_duration"` // in seconds
+	SnapshotID          string  `json:"snapshot_id"`
+}