One can pass function definitions as parameters to a ScriptBlock using the method described in this post (https://powershell.org/forums/topic/pass-function-definitions-to-scriptblock/), but this method only saves space in the ScriptBlock; it doesn’t prevent the functions from being defined twice.
I tried implementing actual lambda functions using this syntax:
$TestFunction = {
param($server)
write-host $server
}
$TestFunction.invoke($server)
This works for this simple example (the server name is returned), but implemented as follows in a larger script, the functions do not execute (i.e., running ScriptName.ps1 -ConfigFile Chef.config does not error out, but kicks back to the command prompt without doing anything).
Any ideas why the functions wouldn’t execute in this script?
Any help is appreciated.
$BootStrap = {
param($Server,$Username,$Password)
$NodeList = @(knife node list)
if($NodeList -notcontains $server)
{
try {
#knife bootstrap windows winrm $server --winrm-user $username --winrm-password $password --node-name $server --y
Invoke-WebRequest https://devops-api.prd.costargroup.com/api/chef/bootstrap?server_name=$server
Invoke-Command $server { chef-client }
Write-Host `n"$server" -ForegroundColor Cyan -NoNewline; Write-Host " Bootstrap SUCCESS" -ForegroundColor Green
[boolean]$BootstrapSuccess = "true"
return [boolean]$BootstrapSuccess
}
catch {
$ErrorMessage = $_.Exception.Message
Write-Host "The error message was $ErrorMessage"
[boolean]$BootstrapSuccess = "false"
return [boolean]$BootstrapSuccess
}
}
else{ Write-Host "$Server already exists in Chef, processing next server..." -ForegroundColor Yellow }
}
$RunChefClient = {
param($server)
Invoke-Command $server {chef-client}
}
$TestFunction = {
param($server)
write-host $server
}
$SetEnvironment = {
param($Server,$Environment)
if(!([string]::IsNullOrWhiteSpace($Environment)))
{
try{
knife node environment_set $server $environment 2> $null
Write-Host `n"$server" -ForegroundColor Cyan -NoNewline; Write-Host " Environment set SUCCESS" -ForegroundColor Green
}
catch
{
$ErrorMessage = $_.Exception.Message
Write-Host "The error message was $ErrorMessage"
Throw "Environment set failed, stopping script..."
Exit
}
}
else {Write-Host "No valid environment to set, exiting..."; exit}
}
$SetTags = {
param($Server,$Tags)
foreach ($tag in $Tags) {
try{
knife tag create $Server $Tag 2> $null
write-host $Server -ForegroundColor Cyan -NoNewline; write-host " $($Tag) "-ForegroundColor Yellow -NoNewline; write-host "Tag Applied Successfully" -ForegroundColor Green
}
catch{
$ErrorMessage = $_.Exception.Message
Write-Host "The error message was $ErrorMessage"
Throw "Tag application failed, stopping script..."
Exit
}
}
}
$SetRoles = {
param($Server,$Roles)
foreach ($role in $Roles) {
try{
knife node run_list add $Server role[$($role)] 2> $null
write-host $Server -ForegroundColor Cyan -NoNewline; write-host " $($role) "-ForegroundColor Yellow -NoNewline; write-host "Role Applied Successfully" -ForegroundColor Green
}
catch{
$ErrorMessage = $_.Exception.Message
Write-Host "The error message was $ErrorMessage"
Throw "Role application failed, stopping script..."
Exit
}
}
}
$DisplayJobStatus = {
$activity = 'Bootstrapping servers in $Servers and setting Chef environment...'
#Get and display job status
$RunningJobs = get-job | ? { $_.state -eq "running" }
$InitialRunningJobsCount = $RunningJobs.count
$CurrentRunningJobsCount = $RunningJobs.count
while($CurrentRunningJobsCount -gt 0) {
$PercentComplete=[math]::Round((($InitialRunningJobsCount-$CurrentRunningJobsCount)/$InitialRunningJobsCount * 100),2)
write-progress -activity "$activity" -status "Progress: $PercentComplete%" -percentcomplete (($InitialRunningJobsCount-$CurrentRunningJobsCount)/$InitialRunningJobsCount*100)
$Jobs | Receive-Job
$CurrentRunningJobsCount = (get-job | ? { $_.state -eq "running" }).Count
}
}
#Create bootstrap job for each server, pass lambda functions to Scriptblock for execution.
if(($Username -ne $null) -and ($Password -ne $null))
{
ForEach($HashTable in $Config)
{
$Server = $HashTable.Server
$Roles = $HashTable.Roles
$Tags = $HashTable.Tags
$Environment = $HashTable.Environment
$ScriptBlock = {
param ($Server,$Roles,$Tags,$Environment,$Username,$Password,$BootStrap,$RunChefClient,$SetEnvironment,$SetTags,$SetRoles)
if(($BootStrap.invoke($Server,$Username,$Password)))
{
$SetEnvironment.invoke($Server,$Environment)
$SetTags.invoke($Server,$Tags)
$SetRoles.invoke($Server,$Roles)
$RunChefClient.invoke($Server)
}
else {Write-Host "Bootstrap failed, processing next server..."; return}
}
$Jobs += Start-Job -ScriptBlock $ScriptBlock -ArgumentList @($Server,$Roles,$Tags,$Environment,$Username,$Password,$BootStrap,$RunChefClient,$SetEnvironment,$SetTags,$SetRoles,$DisplayJobStatus)
}
#$DisplayJobStatus.invoke()
}
else {Write-Host "Username or password is missing, exiting..." -ForegroundColor Red; exit}
}
Main