Update go-concert to 0.1.0

NOTICE.txt

@@ -6336,11 +6336,11 @@ SOFTWARE
 
 --------------------------------------------------------------------------------
 Dependency : github.com/elastic/go-concert
-Version: v0.0.4
+Version: v0.1.0
 Licence type (autodetected): Apache-2.0
 --------------------------------------------------------------------------------
 
-Contents of probable licence file $GOMODCACHE/github.com/elastic/go-concert@v0.0.4/LICENSE:
+Contents of probable licence file $GOMODCACHE/github.com/elastic/go-concert@v0.1.0/LICENSE:
 
                                  Apache License
                            Version 2.0, January 2004

filebeat/input/filestream/filestream.go

@@ -18,18 +18,19 @@
 package filestream
 
 import (
-	"context"
 	"errors"
 	"io"
 	"os"
 	"time"
 
+	"github.com/elastic/go-concert/ctxtool"
+	"github.com/elastic/go-concert/timed"
+	"github.com/elastic/go-concert/unison"
+
 	input "github.com/elastic/beats/v7/filebeat/input/v2"
 	"github.com/elastic/beats/v7/libbeat/common/backoff"
 	"github.com/elastic/beats/v7/libbeat/common/file"
 	"github.com/elastic/beats/v7/libbeat/logp"
-	"github.com/elastic/go-concert/ctxtool"
-	"github.com/elastic/go-concert/unison"
 )
 
 var (
@@ -39,10 +40,9 @@ var (
 
 // logFile contains all log related data
 type logFile struct {
-	file          *os.File
-	log           *logp.Logger
-	ctx           context.Context
-	cancelReading context.CancelFunc
+	file      *os.File
+	log       *logp.Logger
+	readerCtx ctxtool.CancelContext
 
 	closeAfterInterval time.Duration
 	closeOnEOF         bool
@@ -55,7 +55,7 @@ type logFile struct {
 	offset       int64
 	lastTimeRead time.Time
 	backoff      backoff.Backoff
-	tg           unison.TaskGroup
+	tg           *unison.TaskGroup
 }
 
 // newFileReader creates a new log instance to read log sources
@@ -71,6 +71,9 @@ func newFileReader(
 		return nil, err
 	}
 
+	readerCtx := ctxtool.WithCancelContext(ctxtool.FromCanceller(canceler))
+	tg := unison.TaskGroupWithCancel(readerCtx)
+
 	l := &logFile{
 		file:               f,
 		log:                log,
@@ -83,16 +86,10 @@ func newFileReader(
 		offset:             offset,
 		lastTimeRead:       time.Now(),
 		backoff:            backoff.NewExpBackoff(canceler.Done(), config.Backoff.Init, config.Backoff.Max),
-		tg:                 unison.TaskGroup{},
+		readerCtx:          readerCtx,
+		tg:                 tg,
 	}
 
-	l.ctx, l.cancelReading = ctxtool.WithFunc(ctxtool.FromCanceller(canceler), func() {
-		err := l.tg.Stop()
-		if err != nil {
-			l.log.Errorf("Error while stopping filestream logFile reader: %v", err)
-		}
-	})
-
 	l.startFileMonitoringIfNeeded()
 
 	return l, nil
@@ -103,7 +100,7 @@ func newFileReader(
 func (f *logFile) Read(buf []byte) (int, error) {
 	totalN := 0
 
-	for f.ctx.Err() == nil {
+	for f.readerCtx.Err() == nil {
 		n, err := f.file.Read(buf)
 		if n > 0 {
 			f.offset += int64(n)
@@ -154,35 +151,18 @@ func (f *logFile) startFileMonitoringIfNeeded() {
 }
 
 func (f *logFile) closeIfTimeout(ctx unison.Canceler) {
-	timer := time.NewTimer(f.closeAfterInterval)
-	defer timer.Stop()
-
-	for {
-		select {
-		case <-ctx.Done():
-			return
-		case <-timer.C:
-			f.cancelReading()
-			return
-		}
+	if err := timed.Wait(ctx, f.closeAfterInterval); err == nil {
+		f.readerCtx.Cancel()
 	}
 }
 
 func (f *logFile) periodicStateCheck(ctx unison.Canceler) {
-	ticker := time.NewTicker(f.checkInterval)
-	defer ticker.Stop()
-
-	for {
-		select {
-		case <-ctx.Done():
-			return
-		case <-ticker.C:
-			if f.shouldBeClosed() {
-				f.cancelReading()
-				return
-			}
+	timed.Periodic(ctx, f.checkInterval, func() error {
+		if f.shouldBeClosed() {
+			f.readerCtx.Cancel()
 		}
-	}
+		return nil
+	})
 }
 
 func (f *logFile) shouldBeClosed() bool {
@@ -267,6 +247,8 @@ func (f *logFile) handleEOF() error {
 
 // Close
 func (f *logFile) Close() error {
-	f.cancelReading()
-	return f.file.Close()
+	f.readerCtx.Cancel()
+	err := f.file.Close()
+	f.tg.Stop() // Wait until all resources are released for sure.
+	return err
 }

filebeat/input/filestream/input.go

@@ -159,7 +159,7 @@ func (inp *filestream) Run(
 		return err
 	}
 
-	_, streamCancel := ctxtool.WithFunc(ctxtool.FromCanceller(ctx.Cancelation), func() {
+	_, streamCancel := ctxtool.WithFunc(ctx.Cancelation, func() {
 		log.Debug("Closing reader of filestream")
 		err := r.Close()
 		if err != nil {

filebeat/input/v2/compat/compat.go

@@ -21,6 +21,7 @@
 package compat
 
 import (
+	"context"
 	"fmt"
 	"sync"
 
@@ -31,7 +32,7 @@ import (
 	"github.com/elastic/beats/v7/libbeat/cfgfile"
 	"github.com/elastic/beats/v7/libbeat/common"
 	"github.com/elastic/beats/v7/libbeat/logp"
-	"github.com/elastic/go-concert"
+	"github.com/elastic/go-concert/ctxtool"
 )
 
 // factory implements the cfgfile.RunnerFactory interface and wraps the
@@ -52,7 +53,7 @@ type runner struct {
 	log       *logp.Logger
 	agent     *beat.Info
 	wg        sync.WaitGroup
-	sig       *concert.OnceSignaler
+	sig       ctxtool.CancelContext
 	input     v2.Input
 	connector beat.PipelineConnector
 }
@@ -94,7 +95,7 @@ func (f *factory) Create(
 		id:        id,
 		log:       f.log.Named(input.Name()),
 		agent:     &f.info,
-		sig:       concert.NewOnceSignaler(),
+		sig:       ctxtool.WithCancelContext(context.Background()),
 		input:     input,
 		connector: p,
 	}, nil
@@ -126,7 +127,7 @@ func (r *runner) Start() {
 }
 
 func (r *runner) Stop() {
-	r.sig.Trigger()
+	r.sig.Cancel()
 	r.wg.Wait()
 	r.log.Infof("Input '%v' stopped", r.input.Name())
 }

filebeat/input/winlog/input.go

@@ -98,7 +98,7 @@ func (eventlogRunner) Run(
 
 	// setup closing the API if either the run function is signaled asynchronously
 	// to shut down or when returning after io.EOF
-	cancelCtx, cancelFn := ctxtool.WithFunc(ctxtool.FromCanceller(ctx.Cancelation), func() {
+	cancelCtx, cancelFn := ctxtool.WithFunc(ctx.Cancelation, func() {
 		if err := api.Close(); err != nil {
 			log.Errorf("Error while closing Windows Eventlog Access: %v", err)
 		}

filebeat/inputsource/common/dgram/server.go

@@ -72,26 +72,29 @@ func (l *Listener) Run(ctx context.Context) error {
 	l.log.Info("Started listening for " + l.family.String() + " connection")
 
 	for ctx.Err() == nil {
-		conn, err := l.listener()
-		if err != nil {
-			l.log.Debugw("Cannot connect", "error", err)
-			continue
-		}
-		connCtx, connCancel := ctxtool.WithFunc(ctx, func() {
-			conn.Close()
-		})
-
-		err = l.run(connCtx, conn)
-		if err != nil {
-			l.log.Debugw("Error while processing input", "error", err)
-			connCancel()
-			continue
-		}
-		connCancel()
+		l.doRun(ctx)
 	}
 	return nil
 }
 
+func (l *Listener) doRun(ctx context.Context) {
+	conn, err := l.listener()
+	if err != nil {
+		l.log.Debugw("Cannot connect", "error", err)
+		return
+	}
+
+	connCtx, connCancel := ctxtool.WithFunc(ctx, func() {
+		conn.Close()
+	})
+	defer connCancel()
+
+	err = l.connectAndRun(connCtx, conn)
+	if err != nil {
+		l.log.Debugw("Error while processing input", "error", err)
+	}
+}
+
 func (l *Listener) Start() error {
 	l.log.Info("Started listening for " + l.family.String() + " connection")
 
@@ -106,12 +109,14 @@ func (l *Listener) Start() error {
 		})
 		defer connCancel()
 
-		return l.run(ctxtool.FromCanceller(connCtx), conn)
+		return l.connectAndRun(ctxtool.FromCanceller(connCtx), conn)
 	})
 	return nil
 }
 
-func (l *Listener) run(ctx context.Context, conn net.PacketConn) error {
+func (l *Listener) connectAndRun(ctx context.Context, conn net.PacketConn) error {
+	defer l.log.Recover("Panic handling datagram")
+
 	handler := l.connect(*l.config)
 	for ctx.Err() == nil {
 		err := handler(ctx, conn)

filebeat/inputsource/common/streaming/listener.go

@@ -41,8 +41,7 @@ type Listener struct {
 	family          inputsource.Family
 	wg              sync.WaitGroup
 	log             *logp.Logger
-	ctx             context.Context
-	cancel          context.CancelFunc
+	ctx             ctxtool.CancelContext
 	clientsCount    atomic.Int
 	handlerFactory  HandlerFactory
 	listenerFactory ListenerFactory
@@ -111,9 +110,9 @@ func (l *Listener) initListen(ctx context.Context) error {
 		return err
 	}
 
-	l.ctx, l.cancel = ctxtool.WithFunc(ctx, func() {
+	l.ctx = ctxtool.WrapCancel(ctxtool.WithFunc(ctx, func() {
 		l.Listener.Close()
-	})
+	}))
 	return nil
 }
 
@@ -171,7 +170,7 @@ func (l *Listener) run() {
 // Stop stops accepting new incoming connections and Close any active clients
 func (l *Listener) Stop() {
 	l.log.Info("Stopping" + l.family.String() + "server")
-	l.cancel()
+	l.ctx.Cancel()
 	l.wg.Wait()
 	l.log.Info(l.family.String() + " server stopped")
 }

go.mod

@@ -61,7 +61,7 @@ require (
 	github.com/eclipse/paho.mqtt.golang v1.2.1-0.20200121105743-0d940dd29fd2
 	github.com/elastic/ecs v1.6.0
 	github.com/elastic/elastic-agent-client/v7 v7.0.0-20200709172729-d43b7ad5833a
-	github.com/elastic/go-concert v0.0.4
+	github.com/elastic/go-concert v0.1.0
 	github.com/elastic/go-libaudit/v2 v2.1.0
 	github.com/elastic/go-licenser v0.3.1
 	github.com/elastic/go-lookslike v0.3.0

go.sum

@@ -253,8 +253,8 @@ github.com/elastic/elastic-agent-client/v7 v7.0.0-20200709172729-d43b7ad5833a h1
 github.com/elastic/elastic-agent-client/v7 v7.0.0-20200709172729-d43b7ad5833a/go.mod h1:uh/Gj9a0XEbYoM4NYz4LvaBVARz3QXLmlNjsrKY9fTc=
 github.com/elastic/fsevents v0.0.0-20181029231046-e1d381a4d270 h1:cWPqxlPtir4RoQVCpGSRXmLqjEHpJKbR60rxh1nQZY4=
 github.com/elastic/fsevents v0.0.0-20181029231046-e1d381a4d270/go.mod h1:Msl1pdboCbArMF/nSCDUXgQuWTeoMmE/z8607X+k7ng=
-github.com/elastic/go-concert v0.0.4 h1:pzgYCmJ/xMJsW8PSk33inAWZ065hrwSeP79TpwAbsLE=
-github.com/elastic/go-concert v0.0.4/go.mod h1:9MtFarjXroUgmm0m6HY3NSe1XiKhdktiNRRj9hWvIaM=
+github.com/elastic/go-concert v0.1.0 h1:gz/yvA3bseuHzoF/lNMltkL30XdPqMo+bg5o2mBx2EE=
+github.com/elastic/go-concert v0.1.0/go.mod h1:9MtFarjXroUgmm0m6HY3NSe1XiKhdktiNRRj9hWvIaM=
 github.com/elastic/go-libaudit/v2 v2.1.0 h1:yWSKoGaoWLGFPjqWrQ4gwtuM77pTk7K4CsPxXss8he4=
 github.com/elastic/go-libaudit/v2 v2.1.0/go.mod h1:MM/l/4xV7ilcl+cIblL8Zn448J7RZaDwgNLE4gNKYPg=
 github.com/elastic/go-licenser v0.3.1 h1:RmRukU/JUmts+rpexAw0Fvt2ly7VVu6mw8z4HrEzObU=

journalbeat/reader/journal.go

@@ -39,23 +39,23 @@ type Reader struct {
 	r       *journalread.Reader
 	journal *sdjournal.Journal
 	config  Config
-	done    chan struct{}
+	ctx     ctxtool.CancelContext
 	logger  *logp.Logger
 	backoff backoff.Backoff
 }
 
 // New creates a new journal reader and moves the FP to the configured position.
-func New(c Config, done chan struct{}, state checkpoint.JournalState, logger *logp.Logger) (*Reader, error) {
+func New(c Config, done <-chan struct{}, state checkpoint.JournalState, logger *logp.Logger) (*Reader, error) {
 	return newReader(c.Path, c, done, state, logger)
 }
 
 // NewLocal creates a reader to read form the local journal and moves the FP
 // to the configured position.
-func NewLocal(c Config, done chan struct{}, state checkpoint.JournalState, logger *logp.Logger) (*Reader, error) {
+func NewLocal(c Config, done <-chan struct{}, state checkpoint.JournalState, logger *logp.Logger) (*Reader, error) {
 	return newReader(LocalSystemJournalID, c, done, state, logger)
 }
 
-func newReader(path string, c Config, done chan struct{}, state checkpoint.JournalState, logger *logp.Logger) (*Reader, error) {
+func newReader(path string, c Config, done <-chan struct{}, state checkpoint.JournalState, logger *logp.Logger) (*Reader, error) {
 	logger = logger.With("path", path)
 	backoff := backoff.NewExpBackoff(done, c.Backoff, c.MaxBackoff)
 
@@ -79,7 +79,7 @@ func newReader(path string, c Config, done chan struct{}, state checkpoint.Journ
 		r:       r,
 		journal: journal,
 		config:  c,
-		done:    done,
+		ctx:     ctxtool.WithCancelContext(ctxtool.FromChannel(done)),
 		logger:  logger,
 		backoff: backoff,
 	}, nil
@@ -100,13 +100,14 @@ func seekBy(log *logp.Logger, c Config, state checkpoint.JournalState) (journalr
 // Close closes the underlying journal reader.
 func (r *Reader) Close() {
 	instance.StopMonitoringJournal(r.config.Path)
+	r.ctx.Cancel()
 	r.r.Close()
 }
 
 // Next waits until a new event shows up and returns it.
 // It blocks until an event is returned or an error occurs.
 func (r *Reader) Next() (*beat.Event, error) {
-	entry, err := r.r.Next(ctxtool.FromChannel(r.done))
+	entry, err := r.r.Next(r.ctx)
 	if err != nil {
 		return nil, err
 	}

x-pack/filebeat/input/cloudfoundry/v1.go

@@ -51,7 +51,7 @@ func (i *inputV1) Run(ctx v2.Context, publisher stateless.Publisher) error {
 		return errors.Wrapf(err, "initializing doppler consumer")
 	}
 
-	stopCtx, cancel := ctxtool.WithFunc(ctxtool.FromCanceller(ctx.Cancelation), func() {
+	stopCtx, cancel := ctxtool.WithFunc(ctx.Cancelation, func() {
 		// wait stops the consumer and waits for all internal go-routines to be stopped.
 		consumer.Wait()
 	})