How to use Exec method of wait Package

Best Testcontainers-go code snippet using wait.Exec

buffer.go

Source:buffer.go

1// Licensed to the Apache Software Foundation (ASF) under one or more2// contributor license agreements.  See the NOTICE file distributed with3// this work for additional information regarding copyright ownership.4// The ASF licenses this file to You under the Apache License, Version 2.05// (the "License"); you may not use this file except in compliance with6// the License.  You may obtain a copy of the License at7//8//    http://www.apache.org/licenses/LICENSE-2.09//10// Unless required by applicable law or agreed to in writing, software11// distributed under the License is distributed on an "AS IS" BASIS,12// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.13// See the License for the specific language governing permissions and14// limitations under the License.15package direct16import (17	"context"18	"fmt"19	"github.com/apache/beam/sdks/go/pkg/beam/core/runtime/exec"20	"github.com/apache/beam/sdks/go/pkg/beam/core/typex"21	"github.com/apache/beam/sdks/go/pkg/beam/log"22)23// buffer buffers all input and notifies on FinishBundle. It is also a SideInputAdapter.24// It is used as a guard for the wait node to buffer data used as side input.25type buffer struct {26	uid    exec.UnitID27	next   exec.UnitID // debug only28	read   exec.UnitID // debug only29	notify func(ctx context.Context) error30	buf  []exec.FullValue31	done bool32}33func (n *buffer) ID() exec.UnitID {34	return n.uid35}36func (n *buffer) Up(ctx context.Context) error {37	return nil38}39func (n *buffer) StartBundle(ctx context.Context, id string, data exec.DataContext) error {40	n.buf = nil41	n.done = false42	return nil43}44func (n *buffer) ProcessElement(ctx context.Context, elm *exec.FullValue, values ...exec.ReStream) error {45	n.buf = append(n.buf, *elm)46	return nil47}48func (n *buffer) FinishBundle(ctx context.Context) error {49	n.done = true50	return n.notify(ctx)51}52func (n *buffer) Down(ctx context.Context) error {53	return nil54}55func (n *buffer) NewIterable(ctx context.Context, reader exec.StateReader, w typex.Window) (exec.ReStream, error) {56	if !n.done {57		panic(fmt.Sprintf("buffer[%v] incomplete: %v", n.uid, len(n.buf)))58	}59	return &exec.FixedReStream{Buf: n.buf}, nil60}61func (n *buffer) String() string {62	return fmt.Sprintf("buffer[%v]. wait:%v Out:%v", n.uid, n.next, n.read)63}64// wait buffers all input until the guard condition is triggered. It then65// proceeds normally. The main purpose is to delay bundle processing until side input66// is ready.67type wait struct {68	UID  exec.UnitID69	need int // guards needed70	next exec.Node71	instID string72	mgr    exec.DataContext73	buf   []bufElement74	ready int  // guards ready75	done  bool // FinishBundle called for main input?76}77type bufElement struct {78	elm    exec.FullValue79	values []exec.ReStream80}81func (w *wait) ID() exec.UnitID {82	return w.UID83}84func (w *wait) notify(ctx context.Context) error {85	if w.ready == w.need {86		panic("Too many notify")87	}88	w.ready++89	if w.ready < w.need {90		return nil91	}92	// All ready: continue the processing. We may or may not have buffered93	// all the data. If not, wait is a pass-through going forward.94	log.Debugf(ctx, "wait[%v] unblocked w/ %v [%v]", w.UID, len(w.buf), w.done)95	if err := w.next.StartBundle(ctx, w.instID, w.mgr); err != nil {96		return err97	}98	for _, element := range w.buf {99		if err := w.next.ProcessElement(ctx, &element.elm, element.values...); err != nil {100			return err101		}102	}103	w.buf = nil104	if w.done {105		if err := w.next.FinishBundle(ctx); err != nil {106			return err107		}108	}109	log.Debugf(ctx, "wait[%v] done", w.UID)110	return nil111}112func (w *wait) Up(ctx context.Context) error {113	return nil114}115func (w *wait) StartBundle(ctx context.Context, id string, data exec.DataContext) error {116	return nil // done in notify117}118func (w *wait) ProcessElement(ctx context.Context, elm *exec.FullValue, values ...exec.ReStream) error {119	if w.ready < w.need {120		// log.Printf("buffer[%v]: %v", w.UID, elm)121		w.buf = append(w.buf, bufElement{elm: *elm, values: values})122		return nil123	}124	// log.Printf("NOT buffer[%v]: %v", w.UID, elm)125	return w.next.ProcessElement(ctx, elm, values...)126}127func (w *wait) FinishBundle(ctx context.Context) error {128	if w.ready < w.need || w.done {129		w.done = true130		return nil131	}132	w.done = true133	return w.next.FinishBundle(ctx)134}135func (w *wait) Down(ctx context.Context) error {136	return nil137}138func (w *wait) String() string {139	return fmt.Sprintf("wait[%v] Out:%v", w.need, w.next.ID())140}...

smbsafe_test.go

Source:smbsafe_test.go

...6	"github.com/stretchr/testify/require"7	"github.com/ubuntu/adsys/internal/smbsafe"8)9var waitTime = time.Millisecond * 1010func TestExclusiveLockExec(t *testing.T) {11	// first lock takes it immediately12	now := time.Now()13	smbsafe.WaitExec()14	shouldNotHaveWaited(t, now)15	// WaitSmb should wait16	wg := sync.WaitGroup{}17	wg.Add(1)18	go func() {19		defer wg.Done()20		now := time.Now()21		smbsafe.WaitSmb()22		shouldHaveWaited(t, now)23		smbsafe.DoneSmb()24	}()25	// Wait more than minimum duration time to release the lock26	time.Sleep(waitTime)27	smbsafe.DoneExec()28	wg.Wait()29}30func TestExclusiveLockSmb(t *testing.T) {31	// first lock takes it immediately32	now := time.Now()33	smbsafe.WaitSmb()34	shouldNotHaveWaited(t, now)35	// WaitExec should wait36	wg := sync.WaitGroup{}37	wg.Add(1)38	go func() {39		defer wg.Done()40		now := time.Now()41		smbsafe.WaitExec()42		shouldHaveWaited(t, now)43		smbsafe.DoneExec()44	}()45	// Wait more than minimum duration time to release the lock46	time.Sleep(waitTime)47	smbsafe.DoneSmb()48	wg.Wait()49}50func TestMultipleExecLocksOnlyReleaseOnLast(t *testing.T) {51	// first lock takes it immediately52	now := time.Now()53	smbsafe.WaitExec()54	shouldNotHaveWaited(t, now)55	smbsafe.WaitExec()56	shouldNotHaveWaited(t, now)57	smbsafe.WaitExec()58	shouldNotHaveWaited(t, now)59	// WaitSmb should wait60	wg := sync.WaitGroup{}61	wg.Add(1)62	go func() {63		defer wg.Done()64		now := time.Now()65		smbsafe.WaitSmb()66		shouldHaveWaited(t, now)67		smbsafe.DoneSmb()68	}()69	smbsafe.DoneExec()70	smbsafe.DoneExec()71	// Only wait before latest unlock72	time.Sleep(waitTime)73	smbsafe.DoneExec()74	wg.Wait()75}76func TestMultipleSmbLocksOnlyReleaseOnLast(t *testing.T) {77	// first lock takes it immediately78	now := time.Now()79	smbsafe.WaitSmb()80	shouldNotHaveWaited(t, now)81	smbsafe.WaitSmb()82	shouldNotHaveWaited(t, now)83	smbsafe.WaitSmb()84	shouldNotHaveWaited(t, now)85	// WaitExec should wait86	wg := sync.WaitGroup{}87	wg.Add(1)88	go func() {89		defer wg.Done()90		now := time.Now()91		smbsafe.WaitExec()92		shouldHaveWaited(t, now)93		smbsafe.DoneExec()94	}()95	smbsafe.DoneSmb()96	smbsafe.DoneSmb()97	// Only wait before latest unlock98	time.Sleep(waitTime)99	smbsafe.DoneSmb()100	wg.Wait()101}102func shouldHaveWaited(t *testing.T, startpoint time.Time) {103	t.Helper()104	require.Less(t, int64(waitTime), int64(time.Since(startpoint)), "Should have waited")105}106func shouldNotHaveWaited(t *testing.T, startpoint time.Time) {107	t.Helper()...

exec.go

Source:exec.go

...42	// Simplified wrapper for Process.Pid43	Pid() int44}45// Basic Cmd implementation based on exec.Cmd46type ExecCmd struct {47	*exec.Cmd48	cancel context.CancelFunc49	wait   sync.Once50}51func Command(name string, arg ...string) *ExecCmd {52	return CommandContext(context.Background(), name, arg...)53}54func CommandContext(ctx context.Context, name string, arg ...string) *ExecCmd {55	ctx, cancel := context.WithCancel(ctx)56	return &ExecCmd{57		Cmd:    exec.CommandContext(ctx, name, arg...),58		cancel: cancel,59	}60}61func (cmd *ExecCmd) Wait() error {62	var err error63	cmd.wait.Do(func() {64		err = cmd.Cmd.Wait()65	})66	return err67}68// safe even if already dead69func (cmd *ExecCmd) Kill() error {70	cmd.cancel()71	err := cmd.Wait()72	if err == nil {73		return nil74	}75	if eerr, ok := err.(*exec.ExitError); ok {76		status := eerr.Sys().(syscall.WaitStatus)77		if status.Signal() == syscall.SIGKILL {78			return nil79		}80	}81	return err82}83func (cmd *ExecCmd) Pid() int {84	return cmd.Process.Pid85}86// IsCmdNotFound reports true if the underlying error was exec.ErrNotFound.87func IsCmdNotFound(err error) bool {88	if eerr, ok := err.(*exec.Error); ok && eerr.Err == ErrNotFound {89		return true90	}91	return false92}...

Exec

Using AI Code Generation

1import (2func main() {3	cmd := exec.Command("ls", "-l")4	out, err := cmd.Output()5	if err != nil {6		log.Fatal(err)7	}8	fmt.Println(string(out))9}10import (11func main() {12	cmd := exec.Command("ls", "-l")13	err := cmd.Start()14	if err != nil {15		log.Fatal(err)16	}17	fmt.Println("Waiting for command to finish...")18	err = cmd.Wait()19	fmt.Println("Command finished with error: ", err)20}21import (22func main() {23	cmd := exec.Command("ls", "-l")24	err := cmd.Run()25	if err != nil {26		log.Fatal(err)27	}28	fmt.Println("Command finished with error: ", err)29}30import (31func main() {32	cmd := exec.Command("ls", "-l")33	out, err := cmd.CombinedOutput()34	if err != nil {35		log.Fatal(err)36	}37	fmt.Println(string(out))38}39import (40func main() {41	path, err := exec.LookPath("ls")42	if err != nil {43		log.Fatal(err)44	}45	fmt.Println(path)46}47import (48func main() {49	cmd := exec.Command("ls", "-l")50	path, err := cmd.LookPath()51	if err != nil {52		log.Fatal(err)53	}54	fmt.Println(path)55}

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