// Run starts the caretakerd execution, every service and required resource.
// This is a blocking method.
func (instance *Execution) Run() (values.ExitCode, error) {
autoStartableServices := instance.executable.Services().GetAllAutoStartable()
// Start all non-master services first to start the master properly.
for _, target := range autoStartableServices {
if target.Config().Type != service.Master {
instance.startAndLogProblemsIfNeeded(target)
}
}
// Now start the master.
masterStarted := false
for _, target := range autoStartableServices {
if target.Config().Type == service.Master {
err := instance.Start(target)
if err != nil {
(*instance).masterError = err
}
masterStarted = true
}
}
if !masterStarted {
(*instance).masterError = errors.New("No master was started. There are no master configured?")
}
if (*instance).masterError != nil {
instance.stopOthers()
}
instance.wg.Wait()
exitCode := values.ExitCode(-1)
if (*instance).masterExitCode != nil {
exitCode = *(*instance).masterExitCode
}
return exitCode, (*instance).masterError
}
func (instance *Execution) runCommand(cmd *exec.Cmd) (values.ExitCode, error) {
var waitStatus syscall.WaitStatus
if err := cmd.Run(); err != nil {
if exitError, ok := err.(*exec.ExitError); ok {
waitStatus = exitError.Sys().(syscall.WaitStatus)
exitSignal := waitStatus.Signal()
if exitSignal > 0 {
return values.ExitCode(int(exitSignal) + 128), nil
}
return values.ExitCode(waitStatus.ExitStatus()), nil
}
return values.ExitCode(0), UnrecoverableError{error: err}
}
waitStatus = cmd.ProcessState.Sys().(syscall.WaitStatus)
return values.ExitCode(waitStatus.ExitStatus()), nil
}
// Run runs this execution.
// This method is a blocking method and could only be executed at this instance once.
func (instance *Execution) Run() (values.ExitCode, error) {
err := instance.handleBeforeRun()
if err != nil {
return values.ExitCode(1), err
}
exitCode, err := instance.preExecution()
if err != nil || exitCode != 0 {
return exitCode, err
}
instance.logger.Log(logger.Debug, "Start service '%s' with command: %s", instance.Name(), instance.commandLineOf(instance.cmd))
exitCode, lastState, err := instance.runBare()
if lastState == Killed {
err = StoppedOrKilledError{error: errors.New("Process was killed.")}
instance.logger.Log(logger.Debug, "Service '%s' ended after kill: %d", instance.Name(), exitCode)
} else if lastState == Stopped {
err = StoppedOrKilledError{error: errors.New("Process was stopped.")}
instance.logger.Log(logger.Debug, "Service '%s' ended successful after stop: %d", instance.Name(), exitCode)
} else if err != nil {
instance.logger.Log(logger.Fatal, err)
} else if instance.service.config.SuccessExitCodes.Contains(exitCode) {
instance.logger.Log(logger.Debug, "Service '%s' ended successful: %d", instance.Name(), exitCode)
} else {
instance.logger.Log(logger.Error, "Service '%s' ended with unexpected code: %d", instance.Name(), exitCode)
err = errors.New("Unexpected error code %d generated by service '%s'", exitCode, instance.Name())
}
instance.postExecution()
return exitCode, err
}
func (instance *Execution) runBare() (values.ExitCode, Status, error) {
if instance.doTrySetRunningState() {
defer instance.doSetDownState()
exitCode, err := instance.runCommand((*instance).cmd)
// This little sleep is required because there is no guarantee anymore that every lock is
// respected if the routines are interrupted.
time.Sleep(5 * time.Millisecond)
return exitCode, instance.getSyncedCurrentStatus(), err
}
return values.ExitCode(0), instance.getSyncedCurrentStatus(), UnrecoverableError{error: errors.New("Cannot run service. Already in status: %v", instance.status)}
}
func (instance *Config) init() {
(*instance).Logger = logger.NewConfig()
(*instance).Command = []values.String{}
(*instance).PreCommands = [][]values.String{}
(*instance).PostCommands = [][]values.String{}
(*instance).Type = AutoStart
(*instance).CronExpression = NewCronExpression()
(*instance).StartDelayInSeconds = values.NonNegativeInteger(0)
(*instance).RestartDelayInSeconds = values.NonNegativeInteger(5)
(*instance).SuccessExitCodes = values.ExitCodes{values.ExitCode(0)}
(*instance).StopSignal = defaultStopSignal()
(*instance).StopSignalTarget = values.ProcessGroup
(*instance).StopCommand = []values.String{}
(*instance).StopWaitInSeconds = values.NonNegativeInteger(30)
(*instance).User = values.String("")
(*instance).Environment = Environments{}
(*instance).Directory = values.String("")
(*instance).AutoRestart = values.OnFailures
(*instance).InheritEnvironment = values.Boolean(true)
(*instance).Access = access.NewNoneConfig()
}
func (instance *Execution) preExecution() (values.ExitCode, error) {
preCommands := instance.service.config.PreCommands
for _, preCommand := range preCommands {
command, handleErrors := instance.extractCommandProperties(preCommand)
if len(command) > 0 {
cmd := instance.generateCmd(command)
instance.logger.Log(logger.Debug, "Execute pre command: %s", instance.commandLineOf(cmd))
exitCode, err := instance.runCommand(cmd)
if handleErrors {
if err != nil {
instance.logger.LogProblem(err, logger.Error, "Pre command failed.")
return exitCode, err
} else if exitCode != 0 {
instance.logger.Log(logger.Error, "Pre command failed. Exit with unexpected exit code: %d", exitCode)
return exitCode, err
}
}
}
}
return values.ExitCode(0), nil
}