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How to use readinessCheck method of commands Package

Best Testkube code snippet using commands.readinessCheck

server.go

Source:server.go

...80func (s *server) String() string {81	return fmt.Sprintf("server %q start-command: `%s`, kill-command: `%s`, restart-command: `%s`, health-check: %v, output-file: %q", s.name,82		commandToString(s.startCommand), commandToString(s.killCommand), commandToString(s.restartCommand), s.healthCheckUrls, s.outFilename)83}84// readinessCheck checks whether services are ready via the supplied health85// check URLs. Once there is an error in errCh, the function will stop waiting86// and return the error.87// TODO(random-liu): Move this to util88func readinessCheck(name string, urls []string, errCh <-chan error) error {89	glog.Infof("Running readiness check for service %q", name)90	endTime := time.Now().Add(*serverStartTimeout)91	blockCh := make(chan error)92	defer close(blockCh)93	for endTime.After(time.Now()) {94		select {95		// We *always* want to run the health check if there is no error on the channel.96		// With systemd, reads from errCh report nil because cmd.Run() waits97		// on systemd-run, rather than the service process. systemd-run quickly98		// exits with status 0, causing the channel to be closed with no error. In99		// this case, you want to wait for the health check to complete, rather100		// than returning from readinessCheck as soon as the channel is closed.101		case err, ok := <-errCh:102			if ok { // The channel is not closed, this is a real error103				if err != nil { // If there is an error, return it104					return err105				}106				// If not, keep checking readiness.107			} else { // The channel is closed, this is only a zero value.108				// Replace the errCh with blockCh to avoid busy loop,109				// and keep checking readiness.110				errCh = blockCh111			}112		case <-time.After(time.Second):113			ready := true114			for _, url := range urls {115				resp, err := http.Head(url)116				if err != nil || resp.StatusCode != http.StatusOK {117					ready = false118					break119				}120			}121			if ready {122				return nil123			}124		}125	}126	return fmt.Errorf("e2e service %q readiness check timeout %v", name, *serverStartTimeout)127}128// start starts the server by running its commands, monitors it with a health129// check, and ensures that it is restarted if applicable.130//131// Note: restartOnExit == true requires len(s.healthCheckUrls) > 0 to work properly.132func (s *server) start() error {133	glog.Infof("Starting server %q with command %q", s.name, commandToString(s.startCommand))134	errCh := make(chan error)135	// Set up restart channels if the server is configured for restart on exit.136	var stopRestartingCh, ackStopRestartingCh chan bool137	if s.restartOnExit {138		if len(s.healthCheckUrls) == 0 {139			return fmt.Errorf("Tried to start %s which has s.restartOnExit == true, but no health check urls provided.", s)140		}141		stopRestartingCh = make(chan bool)142		ackStopRestartingCh = make(chan bool)143		s.stopRestartingCh = stopRestartingCh144		s.ackStopRestartingCh = ackStopRestartingCh145	}146	// This goroutine actually runs the start command for the server.147	go func() {148		defer close(errCh)149		// Create the output filename150		outPath := path.Join(framework.TestContext.ReportDir, s.outFilename)151		outfile, err := os.Create(outPath)152		if err != nil {153			errCh <- fmt.Errorf("failed to create file %q for `%s` %v.", outPath, s, err)154			return155		} else {156			glog.Infof("Output file for server %q: %v", s.name, outfile.Name())157		}158		defer outfile.Close()159		defer outfile.Sync()160		// Set the command to write the output file161		s.startCommand.Stdout = outfile162		s.startCommand.Stderr = outfile163		// If monitorParent is set, set Pdeathsig when starting the server.164		if s.monitorParent {165			// Death of this test process should kill the server as well.166			attrs := &syscall.SysProcAttr{}167			// Hack to set linux-only field without build tags.168			deathSigField := reflect.ValueOf(attrs).Elem().FieldByName("Pdeathsig")169			if deathSigField.IsValid() {170				deathSigField.Set(reflect.ValueOf(syscall.SIGTERM))171			} else {172				errCh <- fmt.Errorf("failed to set Pdeathsig field (non-linux build)")173				return174			}175			s.startCommand.SysProcAttr = attrs176		}177		// Start the command178		err = s.startCommand.Start()179		if err != nil {180			errCh <- fmt.Errorf("failed to run %s: %v", s, err)181			return182		}183		if !s.restartOnExit {184			glog.Infof("Waiting for server %q start command to complete", s.name)185			// If we aren't planning on restarting, ok to Wait() here to release resources.186			// Otherwise, we Wait() in the restart loop.187			err = s.startCommand.Wait()188			if err != nil {189				errCh <- fmt.Errorf("failed to run start command for server %q: %v", s.name, err)190				return191			}192		} else {193			usedStartCmd := true194			for {195				glog.Infof("Running health check for service %q", s.name)196				// Wait for an initial health check to pass, so that we are sure the server started.197				err := readinessCheck(s.name, s.healthCheckUrls, nil)198				if err != nil {199					if usedStartCmd {200						glog.Infof("Waiting for server %q start command to complete after initial health check failed", s.name)201						s.startCommand.Wait() // Release resources if necessary.202					}203					// This should not happen, immediately stop the e2eService process.204					glog.Fatalf("Restart loop readinessCheck failed for %s", s)205				} else {206					glog.Infof("Initial health check passed for service %q", s.name)207				}208				// Initial health check passed, wait until a health check fails again.209			stillAlive:210				for {211					select {212					case <-stopRestartingCh:213						ackStopRestartingCh <- true214						return215					case <-time.After(time.Second):216						for _, url := range s.healthCheckUrls {217							resp, err := http.Head(url)218							if err != nil || resp.StatusCode != http.StatusOK {219								break stillAlive220							}221						}222					}223				}224				if usedStartCmd {225					s.startCommand.Wait() // Release resources from last cmd226					usedStartCmd = false227				}228				if s.restartCommand != nil {229					// Always make a fresh copy of restartCommand before230					// running, we may have to restart multiple times231					s.restartCommand = &exec.Cmd{232						Path:        s.restartCommand.Path,233						Args:        s.restartCommand.Args,234						Env:         s.restartCommand.Env,235						Dir:         s.restartCommand.Dir,236						Stdin:       s.restartCommand.Stdin,237						Stdout:      s.restartCommand.Stdout,238						Stderr:      s.restartCommand.Stderr,239						ExtraFiles:  s.restartCommand.ExtraFiles,240						SysProcAttr: s.restartCommand.SysProcAttr,241					}242					// Run and wait for exit. This command is assumed to have243					// short duration, e.g. systemctl restart244					glog.Infof("Restarting server %q with restart command", s.name)245					err = s.restartCommand.Run()246					if err != nil {247						// This should not happen, immediately stop the e2eService process.248						glog.Fatalf("Restarting server %s with restartCommand failed. Error: %v.", s, err)249					}250				} else {251					s.startCommand = &exec.Cmd{252						Path:        s.startCommand.Path,253						Args:        s.startCommand.Args,254						Env:         s.startCommand.Env,255						Dir:         s.startCommand.Dir,256						Stdin:       s.startCommand.Stdin,257						Stdout:      s.startCommand.Stdout,258						Stderr:      s.startCommand.Stderr,259						ExtraFiles:  s.startCommand.ExtraFiles,260						SysProcAttr: s.startCommand.SysProcAttr,261					}262					glog.Infof("Restarting server %q with start command", s.name)263					err = s.startCommand.Start()264					usedStartCmd = true265					if err != nil {266						// This should not happen, immediately stop the e2eService process.267						glog.Fatalf("Restarting server %s with startCommand failed. Error: %v.", s, err)268					}269				}270			}271		}272	}()273	return readinessCheck(s.name, s.healthCheckUrls, errCh)274}275// kill runs the server's kill command.276func (s *server) kill() error {277	glog.Infof("Kill server %q", s.name)278	name := s.name279	cmd := s.startCommand280	// If s has a restart loop, turn it off.281	if s.restartOnExit {282		s.stopRestartingCh <- true283		<-s.ackStopRestartingCh284	}285	if s.killCommand != nil {286		return s.killCommand.Run()287	}...

readinessCheck

Using AI Code Generation

1import (2func main() {3	app := cli.NewApp()4	app.Commands = []cli.Command{5		{6			Aliases: []string{"rc"},7			Action: func(c *cli.Context) error {8				fmt.Println("Checking readiness")9			},10		},11	}12	app.Run(os.Args)13}

readinessCheck

Using AI Code Generation

1import (2type Command struct {3}4func (c *Command) readinessCheck() bool {5	cmd := exec.Command(c.Path, c.Args...)6	env := os.Environ()7	cmd.Env = append(env, c.Env...)8	err := cmd.Run()9	if err != nil {10	}11}12func main() {13	cmd := &Command{14		Args: []string{"-la"},15		Env:  []string{"PATH=/bin:/sbin:/usr/bin:/usr/sbin"},16	}17	fmt.Println(cmd.readinessCheck())18}

readinessCheck

Using AI Code Generation

1import (2func main() {3	app := cli.NewApp()4	app.Action = func(c *cli.Context) error {5		fmt.Println("Readiness check")6	}7	app.Commands = []cli.Command{8		{9			Aliases: []string{"r"},10			Action: func(c *cli.Context) error {11				fmt.Println("Readiness check")12			},13		},14	}15	app.Run(os.Args)16}17import (18func main() {19	app := cli.NewApp()20	app.Action = func(c *cli.Context) error {21		fmt.Println("Readiness check")22	}23	app.Commands = []cli.Command{24		{25			Aliases: []string{"r"},26			Action: func(c *cli.Context) error {27				fmt.Println("Readiness check")28			},29		},30	}31	app.Run(os.Args)32}33import (34func main() {35	app := cli.NewApp()36	app.Action = func(c *cli.Context) error {37		fmt.Println("Readiness check")38	}39	app.Commands = []cli.Command{40		{41			Aliases: []string{"r"},42			Action: func(c *cli.Context) error {43				fmt.Println("Readiness check")44			},45		},46	}47	app.Run(os.Args)48}49import (

readinessCheck

Using AI Code Generation

1import (2func main() {3	cmd := exec.Command("ping", "google.com")4	err := cmd.Start()5	if err != nil {6		fmt.Println(err)7	}8	fmt.Println("Waiting for command to finish...")

readinessCheck

Using AI Code Generation

1import (2func main() {3	cmd := &cobra.Command{4		Run: func(cmd *cobra.Command, args []string) {5			fmt.Println("readinessCheck")6		},7	}8	if err := cmd.Execute(); err != nil {9		fmt.Println(err)10	}11}12import (13func main() {14	cmd := &cobra.Command{15		Run: func(cmd *cobra.Command, args []string) {16			fmt.Println("readinessCheck")17		},18	}19	if err := cmd.Execute(); err != nil {20		fmt.Println(err)21	}22}23import (24func main() {25	cmd := &cobra.Command{26		Run: func(cmd *cobra.Command, args []string) {27			fmt.Println("readinessCheck")28		},29	}30	if err := cmd.Execute(); err != nil {31		fmt.Println(err)32	}33}34import (35func main() {36	cmd := &cobra.Command{37		Run: func(cmd *cobra.Command, args []string) {38			fmt.Println("readinessCheck")39		},40	}41	if err := cmd.Execute(); err != nil {42		fmt.Println(err)43	}44}45import (46func main() {47	cmd := &cobra.Command{48		Run: func(cmd *cobra

readinessCheck

Using AI Code Generation

1import (2func main() {3	cmd := exec.Command("cmd", "/C", "echo hello")4	err := cmd.Start()5	if err != nil {6		fmt.Println(err)7	}8	output, err := cmd.Output()9	if err != nil {10		fmt.Println(err)11	}12	fmt.Println(string(output))13}14Go | os/exec CommandOutput()15Go | os/exec CommandContext()16Go | os/exec CommandContext()

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