util: simplify progress syncronization

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

build/build.go

@@ -173,7 +173,6 @@ func splitToDriverPairs(availablePlatforms map[string]int, opt map[string]Option
 }
 
 func resolveDrivers(ctx context.Context, drivers []DriverInfo, auth Auth, opt map[string]Options, pw progress.Writer) (map[string][]driverPair, []*client.Client, error) {
-
 	availablePlatforms := map[string]int{}
 	for i, d := range drivers {
 		for _, p := range d.Platform {
@@ -479,7 +478,7 @@ func toSolveOpt(ctx context.Context, d driver.Driver, multiDriver bool, opt Opti
 	return &so, releaseF, nil
 }
 
-func Build(ctx context.Context, drivers []DriverInfo, opt map[string]Options, docker DockerAPI, auth Auth, pw progress.Writer) (resp map[string]*client.SolveResponse, err error) {
+func Build(ctx context.Context, drivers []DriverInfo, opt map[string]Options, docker DockerAPI, auth Auth, w progress.Writer) (resp map[string]*client.SolveResponse, err error) {
 	if len(drivers) == 0 {
 		return nil, errors.Errorf("driver required for build")
 	}
@@ -506,10 +505,8 @@ func Build(ctx context.Context, drivers []DriverInfo, opt map[string]Options, do
 		}
 	}
 
-	m, clients, err := resolveDrivers(ctx, drivers, auth, opt, pw)
+	m, clients, err := resolveDrivers(ctx, drivers, auth, opt, w)
 	if err != nil {
-		close(pw.Status())
-		<-pw.Done()
 		return nil, err
 	}
 
@@ -522,7 +519,6 @@ func Build(ctx context.Context, drivers []DriverInfo, opt map[string]Options, do
 		}
 	}()
 
-	mw := progress.NewMultiWriter(pw)
 	eg, ctx := errgroup.WithContext(ctx)
 
 	for k, opt := range opt {
@@ -530,8 +526,8 @@ func Build(ctx context.Context, drivers []DriverInfo, opt map[string]Options, do
 		for i, dp := range m[k] {
 			d := drivers[dp.driverIndex].Driver
 			opt.Platforms = dp.platforms
-			so, release, err := toSolveOpt(ctx, d, multiDriver, opt, pw, func(name string) (io.WriteCloser, func(), error) {
+			so, release, err := toSolveOpt(ctx, d, multiDriver, opt, w, func(name string) (io.WriteCloser, func(), error) {
-				return newDockerLoader(ctx, docker, name, mw)
+				return newDockerLoader(ctx, docker, name, w)
 			})
 			if err != nil {
 				return nil, err
@@ -559,8 +555,7 @@ func Build(ctx context.Context, drivers []DriverInfo, opt map[string]Options, do
 			var pushNames string
 
 			eg.Go(func() error {
-				pw := mw.WithPrefix("default", false)
+				pw := progress.WithPrefix(w, "default", false)
-				defer close(pw.Status())
 				wg.Wait()
 				select {
 				case <-ctx.Done():
@@ -663,23 +658,15 @@ func Build(ctx context.Context, drivers []DriverInfo, opt map[string]Options, do
 				}
 
 				func(i int, dp driverPair, so client.SolveOpt) {
-					pw := mw.WithPrefix(k, multiTarget)
+					pw := progress.WithPrefix(w, k, multiTarget)
 
 					c := clients[dp.driverIndex]
 
-					var statusCh chan *client.SolveStatus
+					pw = progress.ResetTime(pw)
-					if pw != nil {
-						pw = progress.ResetTime(pw)
-						statusCh = pw.Status()
-						eg.Go(func() error {
-							<-pw.Done()
-							return pw.Err()
-						})
-					}
 
 					eg.Go(func() error {
 						defer wg.Done()
-						rr, err := c.Solve(ctx, nil, so, statusCh)
+						rr, err := c.Solve(ctx, nil, so, progress.NewChannel(pw))
 						if err != nil {
 							return err
 						}
@@ -829,7 +816,7 @@ func notSupported(d driver.Driver, f driver.Feature) error {
 
 type dockerLoadCallback func(name string) (io.WriteCloser, func(), error)
 
-func newDockerLoader(ctx context.Context, d DockerAPI, name string, mw *progress.MultiWriter) (io.WriteCloser, func(), error) {
+func newDockerLoader(ctx context.Context, d DockerAPI, name string, status progress.Writer) (io.WriteCloser, func(), error) {
 	c, err := d.DockerAPI(name)
 	if err != nil {
 		return nil, nil, err
@@ -852,7 +839,7 @@ func newDockerLoader(ctx context.Context, d DockerAPI, name string, mw *progress
 				w.mu.Unlock()
 				return
 			}
-			prog := mw.WithPrefix("", false)
+			prog := progress.WithPrefix(status, "", false)
 			progress.FromReader(prog, "importing to docker", resp.Body)
 		},
 		done:   done,

build/url.go

@@ -60,7 +60,7 @@ func createTempDockerfileFromURL(ctx context.Context, d driver.Driver, url strin
 		}
 		out = dir
 		return nil, nil
-	}, pw.Status())
+	}, progress.NewChannel(pw))
 
 	if err != nil {
 		return "", err

commands/build.go

@@ -203,9 +203,14 @@ func buildTargets(ctx context.Context, dockerCli command.Cli, opts map[string]bu
 
 	ctx2, cancel := context.WithCancel(context.TODO())
 	defer cancel()
-	pw := progress.NewPrinter(ctx2, os.Stderr, progressMode)
+	printer := progress.NewPrinter(ctx2, os.Stderr, progressMode)
+
+	_, err = build.Build(ctx, dis, opts, dockerAPI(dockerCli), dockerCli.ConfigFile(), printer)
+	err1 := printer.Wait()
+	if err == nil {
+		err = err1
+	}
 
-	_, err = build.Build(ctx, dis, opts, dockerAPI(dockerCli), dockerCli.ConfigFile(), pw)
 	return err
 }
 

commands/inspect.go

@@ -171,25 +171,27 @@ func boot(ctx context.Context, ngi *nginfo, dockerCli command.Cli) (bool, error)
 		return false, nil
 	}
 
-	pw := progress.NewPrinter(context.TODO(), os.Stderr, "auto")
+	printer := progress.NewPrinter(context.TODO(), os.Stderr, "auto")
-
-	mw := progress.NewMultiWriter(pw)
 
 	eg, _ := errgroup.WithContext(ctx)
 	for _, idx := range toBoot {
 		func(idx int) {
 			eg.Go(func() error {
-				pw := mw.WithPrefix(ngi.ng.Nodes[idx].Name, len(toBoot) > 1)
+				pw := progress.WithPrefix(printer, ngi.ng.Nodes[idx].Name, len(toBoot) > 1)
 				_, err := driver.Boot(ctx, ngi.drivers[idx].di.Driver, pw)
 				if err != nil {
 					ngi.drivers[idx].err = err
 				}
-				close(pw.Status())
-				<-pw.Done()
 				return nil
 			})
 		}(idx)
 	}
 
-	return true, eg.Wait()
+	err := eg.Wait()
+	err1 := printer.Wait()
+	if err == nil {
+		err = err1
+	}
+
+	return true, err
 }

driver/driver.go

@@ -71,11 +71,7 @@ func Boot(ctx context.Context, d Driver, pw progress.Writer) (*client.Client, er
 			if try > 2 {
 				return nil, errors.Errorf("failed to bootstrap %T driver in attempts", d)
 			}
-			if err := d.Bootstrap(ctx, func(s *client.SolveStatus) {
+			if err := d.Bootstrap(ctx, pw.Write); err != nil {
-				if pw != nil {
-					pw.Status() <- s
-				}
-			}); err != nil {
 				return nil, err
 			}
 		}

util/progress/fromreader.go

@@ -11,7 +11,6 @@ import (
 )
 
 func FromReader(w Writer, name string, rc io.ReadCloser) {
-	status := w.Status()
 	dgst := digest.FromBytes([]byte(identity.NewID()))
 	tm := time.Now()
 
@@ -21,9 +20,9 @@ func FromReader(w Writer, name string, rc io.ReadCloser) {
 		Started: &tm,
 	}
 
-	status <- &client.SolveStatus{
+	w.Write(&client.SolveStatus{
 		Vertexes: []*client.Vertex{&vtx},
-	}
+	})
 
 	_, err := io.Copy(ioutil.Discard, rc)
 
@@ -33,8 +32,7 @@ func FromReader(w Writer, name string, rc io.ReadCloser) {
 	if err != nil {
 		vtx2.Error = err.Error()
 	}
-	status <- &client.SolveStatus{
+	w.Write(&client.SolveStatus{
 		Vertexes: []*client.Vertex{&vtx2},
-	}
+	})
-	close(status)
 }

util/progress/multiwriter.go

@@ -1,101 +1,32 @@
 package progress
 
 import (
-	"context"
 	"strings"
-	"sync"
 
 	"github.com/moby/buildkit/client"
-	"golang.org/x/sync/errgroup"
 )
 
-type MultiWriter struct {
+func WithPrefix(w Writer, pfx string, force bool) Writer {
-	w     Writer
+	return &prefixed{
-	eg    *errgroup.Group
+		main:  w,
-	once  sync.Once
+		pfx:   pfx,
-	ready chan struct{}
+		force: force,
-}
-
-func (mw *MultiWriter) WithPrefix(pfx string, force bool) Writer {
-	in := make(chan *client.SolveStatus)
-	out := mw.w.Status()
-	p := &prefixed{
-		main: mw.w,
-		in:   in,
 	}
-	mw.eg.Go(func() error {
-		mw.once.Do(func() {
-			close(mw.ready)
-		})
-		for {
-			select {
-			case v, ok := <-in:
-				if ok {
-					if force {
-						for _, v := range v.Vertexes {
-							v.Name = addPrefix(pfx, v.Name)
-						}
-					}
-					out <- v
-				} else {
-					return nil
-				}
-			case <-mw.Done():
-				return mw.Err()
-			}
-		}
-	})
-	return p
-}
-
-func (mw *MultiWriter) Done() <-chan struct{} {
-	return mw.w.Done()
-}
-
-func (mw *MultiWriter) Err() error {
-	return mw.w.Err()
-}
-
-func (mw *MultiWriter) Status() chan *client.SolveStatus {
-	return nil
 }
 
 type prefixed struct {
-	main Writer
+	main  Writer
-	in   chan *client.SolveStatus
+	pfx   string
+	force bool
 }
 
-func (p *prefixed) Done() <-chan struct{} {
+func (p *prefixed) Write(v *client.SolveStatus) {
-	return p.main.Done()
+	if p.force {
-}
+		for _, v := range v.Vertexes {
-
+			v.Name = addPrefix(p.pfx, v.Name)
-func (p *prefixed) Err() error {
+		}
-	return p.main.Err()
-}
-
-func (p *prefixed) Status() chan *client.SolveStatus {
-	return p.in
-}
-
-func NewMultiWriter(pw Writer) *MultiWriter {
-	if pw == nil {
-		return nil
-	}
-	eg, _ := errgroup.WithContext(context.TODO())
-
-	ready := make(chan struct{})
-
-	go func() {
-		<-ready
-		eg.Wait()
-		close(pw.Status())
-	}()
-
-	return &MultiWriter{
-		w:     pw,
-		eg:    eg,
-		ready: ready,
 	}
+	p.main.Write(v)
 }
 
 func addPrefix(pfx, name string) string {

util/progress/printer.go

@@ -9,32 +9,27 @@ import (
 	"github.com/moby/buildkit/util/progress/progressui"
 )
 
-type printer struct {
+type Printer struct {
 	status chan *client.SolveStatus
 	done   <-chan struct{}
 	err    error
 }
 
-func (p *printer) Done() <-chan struct{} {
+func (p *Printer) Wait() error {
-	return p.done
+	close(p.status)
-}
+	<-p.done
-
-func (p *printer) Err() error {
 	return p.err
 }
 
-func (p *printer) Status() chan *client.SolveStatus {
+func (p *Printer) Write(s *client.SolveStatus) {
-	if p == nil {
+	p.status <- s
-		return nil
-	}
-	return p.status
 }
 
-func NewPrinter(ctx context.Context, out console.File, mode string) Writer {
+func NewPrinter(ctx context.Context, out console.File, mode string) *Printer {
 	statusCh := make(chan *client.SolveStatus)
 	doneCh := make(chan struct{})
 
-	pw := &printer{
+	pw := &Printer{
 		status: statusCh,
 		done:   doneCh,
 	}

util/progress/reset.go

@@ -7,56 +7,45 @@ import (
 )
 
 func ResetTime(in Writer) Writer {
-	w := &pw{Writer: in, status: make(chan *client.SolveStatus), tm: time.Now()}
+	return &pw{Writer: in, status: make(chan *client.SolveStatus), tm: time.Now()}
-	go func() {
+}
-		for {
+
-			select {
+func (w *pw) Write(st *client.SolveStatus) {
-			case <-in.Done():
+	if w.diff == nil {
-				return
+		for _, v := range st.Vertexes {
-			case st, ok := <-w.status:
+			if v.Started != nil {
-				if !ok {
+				d := v.Started.Sub(w.tm)
-					close(in.Status())
+				w.diff = &d
-					return
-				}
-				if w.diff == nil {
-					for _, v := range st.Vertexes {
-						if v.Started != nil {
-							d := v.Started.Sub(w.tm)
-							w.diff = &d
-						}
-					}
-				}
-				if w.diff != nil {
-					for _, v := range st.Vertexes {
-						if v.Started != nil {
-							d := v.Started.Add(-*w.diff)
-							v.Started = &d
-						}
-						if v.Completed != nil {
-							d := v.Completed.Add(-*w.diff)
-							v.Completed = &d
-						}
-					}
-					for _, v := range st.Statuses {
-						if v.Started != nil {
-							d := v.Started.Add(-*w.diff)
-							v.Started = &d
-						}
-						if v.Completed != nil {
-							d := v.Completed.Add(-*w.diff)
-							v.Completed = &d
-						}
-						v.Timestamp = v.Timestamp.Add(-*w.diff)
-					}
-					for _, v := range st.Logs {
-						v.Timestamp = v.Timestamp.Add(-*w.diff)
-					}
-				}
-				in.Status() <- st
 			}
 		}
-	}()
+	}
-	return w
+	if w.diff != nil {
+		for _, v := range st.Vertexes {
+			if v.Started != nil {
+				d := v.Started.Add(-*w.diff)
+				v.Started = &d
+			}
+			if v.Completed != nil {
+				d := v.Completed.Add(-*w.diff)
+				v.Completed = &d
+			}
+		}
+		for _, v := range st.Statuses {
+			if v.Started != nil {
+				d := v.Started.Add(-*w.diff)
+				v.Started = &d
+			}
+			if v.Completed != nil {
+				d := v.Completed.Add(-*w.diff)
+				v.Completed = &d
+			}
+			v.Timestamp = v.Timestamp.Add(-*w.diff)
+		}
+		for _, v := range st.Logs {
+			v.Timestamp = v.Timestamp.Add(-*w.diff)
+		}
+	}
+	w.Writer.Write(st)
 }
 
 type pw struct {

util/progress/writer.go

@@ -9,13 +9,10 @@ import (
 )
 
 type Writer interface {
-	Done() <-chan struct{}
+	Write(*client.SolveStatus)
-	Err() error
-	Status() chan *client.SolveStatus
 }
 
 func Write(w Writer, name string, f func() error) {
-	status := w.Status()
 	dgst := digest.FromBytes([]byte(identity.NewID()))
 	tm := time.Now()
 
@@ -25,9 +22,9 @@ func Write(w Writer, name string, f func() error) {
 		Started: &tm,
 	}
 
-	status <- &client.SolveStatus{
+	w.Write(&client.SolveStatus{
 		Vertexes: []*client.Vertex{&vtx},
-	}
+	})
 
 	err := f()
 
@@ -37,7 +34,21 @@ func Write(w Writer, name string, f func() error) {
 	if err != nil {
 		vtx2.Error = err.Error()
 	}
-	status <- &client.SolveStatus{
+	w.Write(&client.SolveStatus{
 		Vertexes: []*client.Vertex{&vtx2},
-	}
+	})
+}
+
+func NewChannel(w Writer) chan *client.SolveStatus {
+	ch := make(chan *client.SolveStatus)
+	go func() {
+		for {
+			v, ok := <-ch
+			if !ok {
+				return
+			}
+			w.Write(v)
+		}
+	}()
+	return ch
 }