AWS_Lambda_PowerOff.ps1

# PowerShell script file to be executed as an AWS Lambda function.
#
# When executing in Lambda the following variables will be predefined.
#   $LambdaInput - A PSObject that contains the Lambda function input data.
#   $LambdaContext - An Amazon.Lambda.Core.ILambdaContext object that contains information about the currently running Lambda environment.
#
# The last item in the PowerShell pipeline will be returned as the result of the Lambda function.
#
# To include PowerShell modules with your Lambda function, like the AWSPowerShell.NetCore module, add a "#Requires" statement
# indicating the module and version.
#Requires -Modules @{ModuleName='AWSPowerShell.NetCore';ModuleVersion='3.3.365.0'}
$instances = Get-EC2Instance -Filter @(
    @{name = 'tag:power_off_by_script'; values = "true"}
    @{name = 'instance-state-code'; values = 16}
)
foreach ($instance in $instances){
    $InstanceId = $instance.Instances.InstanceId
    Write-Host "Attempting to stop instance:" $($instanceId)
    Stop-EC2Instance -InstanceId $InstanceId
    Start-Sleep 5
    if (-not (Get-EC2InstanceStatus -InstanceId $InstanceId).InstanceState.Name.Value) {
        Write-Host "'$InstanceId' is switched off"
    }
}
# Uncomment to send the input event to CloudWatch Logs
# Write-Host (ConvertTo-Json -InputObject $LambdaInput -Compress -Depth 5)