Added support to register checks to run in background

lib/daemon/Get-IcingaRegisteredServiceChecks.psm1

@@ -0,0 +1,19 @@
+function Get-IcingaRegisteredServiceChecks()
+{
+    $Services = Get-IcingaPowerShellConfig -Path 'BackgroundDaemon.RegisteredServices';
+    [hashtable]$Output = @{};
+
+    foreach ($service in $Services.PSObject.Properties) {
+        $Content = @{
+            'Id'           = $service.Name;
+            'CheckCommand' = $service.Value.CheckCommand;
+            'Arguments'    = $service.Value.Arguments;
+            'Interval'     = $service.Value.Interval;
+            'TimeIndexes'  = $service.Value.TimeIndexes;
+        };
+
+        $Output.Add($service.Name, $Content);
+    }
+
+    return $Output;
+}

lib/daemon/Register-IcingaServiceCheck.psm1

@@ -0,0 +1,23 @@
+function Register-IcingaServiceCheck()
+{
+    param(
+        [string]$CheckCommand,
+        [hashtable]$Arguments,
+        [int]$Interval        = 60,
+        [array]$TimeIndexes   = @()
+    );
+
+    if ([string]::IsNullOrEmpty($CheckCommand)) {
+        throw 'Please specify a CheckCommand';
+    }
+
+    $Hash = Get-StringSha1 ([string]::Format('{0} {1}', $CheckCommand, ($Arguments | Out-String)));
+    $Path = [string]::Format('BackgroundDaemon.RegisteredServices.{0}', $Hash);
+
+    Set-IcingaPowerShellConfig -Path ([string]::Format('{0}.CheckCommand', $Path)) -Value $CheckCommand;
+    Set-IcingaPowerShellConfig -Path ([string]::Format('{0}.Arguments', $Path)) -Value $Arguments;
+    Set-IcingaPowerShellConfig -Path ([string]::Format('{0}.Interval', $Path)) -Value $Interval;
+    Set-IcingaPowerShellConfig -Path ([string]::Format('{0}.TimeIndexes', $Path)) -Value $TimeIndexes;
+
+    Write-Host 'Icinga Service Check has been configured';
+}

lib/daemon/Show-IcingaRegisteredServiceChecks.psm1

@@ -0,0 +1,11 @@
+function Show-IcingaRegisteredServiceChecks()
+{
+    $Services = Get-IcingaRegisteredServiceChecks;
+
+    foreach ($service in $Services.Keys) {
+        Write-Host ([string]::Format('Service Id: {0}', $service));
+        Write-Host (
+            $Services[$service] | Out-String
+        );
+    }
+}