I am working with Invoke-RestMethod to do some automation. The first call to the target system returns an XML response that contains a collection of items that I want to do some operations on, so I then iterate through that list of objects and make an Invoke-RestMethod
call for each of those items.
The initial call to get the object works just fine, as does the call during the first iteration. On subsequent iterations however the script stalls and eventually I get an error:
Invoke-RestMethod : The operation has timed out
At C:\test\zfa-branch\CreateTCProject.ps1:16 char:2
+ Invoke-RestMethod -Credential $tclogin -Verbose -uri "$serverUrl$buildHref/paus ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Invoke-RestMethod], WebException
+ FullyQualifiedErrorId : System.Net.WebException,Microsoft.PowerShell.Commands.InvokeRestMethodCommand
Doing some research this exact same problem appears to happen when using the HttpWebRequest .Net object and not disposing of the request objects properly (http://stackoverflow.com/questions/5827030/httpwebrequest-times-out-on-second-call).
There is not an obvious way to get the Invoke-RestMethod to use the dispose methods using any of the cmdlet's parameters so I added a "Start-Sleep -s 6" and then "[GC]::Collect()" statements to try and force the issue. Then MOST of the
calls while iterating succeed and I only time out on 1 or 2 out of 10 iterations. Using the Start-Sleep call alone does not resolve the issue, at least at values up to 30 seconds.
Should I give up on Invoke-RestMethod and use the old WebRequest way of doing things? Is Invoke-RestMethod not disposing objects properly in the background? Other ideas welcomed.
Here's a snippet of the script and if it matters to anyone, the automation is for a TeamCity CI build server.
$tclogin = Get-Credential
$serverUrl = "http://some.server.com:9999"
$projectName = "Some Project"
$shareRoots = $true
[System.Reflection.Assembly]::LoadWithPartialName("System.web")
$projectNameEncoded = [System.Web.HttpUtility]::UrlPathEncode($projectName)
$sourceProject = Invoke-RestMethod -Credential $tclogin -Verbose -uri $serverUrl/httpAuth/app/rest/projects/$projectNameEncoded/buildTypes -Method get
foreach ( $buildType in $sourceProject.buildTypes.buildType ) {
$buildHref = $buildType.href
Invoke-RestMethod -Credential $tclogin -Verbose -uri $serverUrl$buildHref/paused -Method put -Body "true" -ContentType "text/plain"
Start-Sleep -s 6
[GC]::Collect()
}
Thanks!
