Can't get wait-job result

Raikoug 0
Viewed 30

I'm trying to achieve this with a code:

  • ☑ Run a command
  • ☑ Wait X seconds
  • ☐ If command completed and is successful i return 1
  • ☐ If command completed and is not successful i return 0
  • ☑ If command did not completed I return 0.

I don't need it to be asynchronous. This is my first code:

$timeoutSeconds = 10
$code = {
    ping something
}
$job = Start-Job -ScriptBlock $code
if (Wait-Job $job -Timeout $timeoutSeconds) { Receive-Job $job }
Remove-Job -force $job

if ($job.State -eq 'Completed'){
    $ExitCode = 0
}
else {
    $ExitCode = 1
}

My Powershell

[System.Environment]::OSVersion.Version

Major  Minor  Build  Revision
-----  -----  -----  --------
6      2      9200   0

I would like this to be not only for my powershell version.

I tried to add a return inside my $code

$code = {
    ping something
    return $LASTEXITCODE
}

But I can't find anything inside my $job.
I tried to assign Receive-Job to a variable, but it doesn't get never populated.

if (Wait-Job $job -Timeout $timeoutSeconds) { $r = Receive-Job $job }

$r is alwasys empty (in both cases: Wait-Job reach or not the timeout).

I want to get the $LASTEXITCODE i'm returning in my $code block, I would like something like:

$timeoutSeconds = 10
$code = {
    ping 2.3.1.2
    return $LASTEXITCODE
}
$job = Start-Job -ScriptBlock $code
if (Wait-Job $job -Timeout $timeoutSeconds) { Receive-Job $job }
Remove-Job -force $job

if ($job.State -eq 'Completed'){
    $ExitCode = $job.ReturnedValue #this doesn't exists
}
else {
    $ExitCode = 1
}

Write-Output $ExitCode

My problem is how to discern if:

  • Job completed in less than timeout because it succeeded
  • Job completed in less than timeout because it failed faster than I thought.

The command I'm running is a software command I would like to leave unkown, it is a something like a ping but:

  1. the command finish in less than 10 seconds when it works (return 0)
  2. the command finish in more than 10 seconds (30 or more) when the resource is unreachable (return 1)
  3. the command finish in less than 10 seconds when something went wrong (return 1)

If the case is 2 the job is not completed. If the case is either 1 or 2 I need the returned value inside the $code block to understand if the command is good or not.

How do I get the returned value inside the $code block outside after the job is completed? (if job is not completed I'm aware I can't have it, but I should be able to use the result of a job)

Thanks

powershell
2 Answers

If Wait-Job -Timeout <timeoutInSeconds> returns the job object then you know the job completed in time. If a terminating error occurred that caused the job to exit prematurely, the State property on the job object will reflect this, so simply do:

$timeoutSeconds = 10
$completedInTime = $false
$code = {
  MyCommands
}

# start job, wait for timeout
$job = Start-Job -ScriptBlock $code
if($job |Wait-Job -Timeout $timeoutSeconds){
  # If it completed successfully, State will have the value `Completed`
  $completedInTime = $job.State -eq 'Completed'
  $results = $job |Receive-Job
}

$job |Remove-Job -Force

# `$true` = 1
# `$false` = 0
$ExitCode = [int]$completedInTime
Mathias R. Jessen0

Thanks to @Mathias R. Jessen I achieved this:

$timeoutSeconds = 10
$completedInTime = $false
$code = {
  ping 2.13.1.2 /n 1 > null # this way results won't have this output that I don't need
  return $LASTEXITCODE
}

# start job, wait for timeout
$job = Start-Job -ScriptBlock $code
if($job |Wait-Job -Timeout $timeoutSeconds){
  # If it completed successfully, State will have the value `Completed`
  if($job.State -eq 'Completed'){
      # Only in this case results will hold the LASTEXITCODE I returned in code block
      $results = $job |Receive-Job
      if ($results -eq 0){
          $ExitCode = 0
      }
      else {
          $ExitCode = 1
     }
  }
  else{
    # In this case I know the command is failing
    $ExitCode = 1
  }
}

$job |Remove-Job -Force
Write-Output $ExitCode
Raikoug0
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