Add support for dynamic background daemon loading

lib/daemon/Get-IcingaBackgroundDaemons.psm1

@@ -0,0 +1,22 @@
+function Get-IcingaBackgroundDaemons()
+{
+    $Daemons = Get-IcingaPowerShellConfig -Path 'BackgroundDaemon.EnabledDaemons';
+
+    if ($null -eq $Daemons) {
+        return $null;
+    }
+
+    [hashtable]$Output = @{};
+
+    foreach ($daemon in $Daemons.PSObject.Properties) {
+        $Arguments = @{};
+
+        foreach ($argument in $daemon.Value.Arguments.PSObject.Properties) {
+            $Arguments.Add($argument.Name, $argument.Value);
+        }
+
+        $Output.Add($daemon.Name, $Arguments);
+    }
+
+    return $Output;
+}

lib/daemon/Register-IcingaBackgroundDaemon.psm1

@@ -0,0 +1,22 @@
+function Register-IcingaBackgroundDaemon()
+{
+    param(
+        [string]$Command,
+        [hashtable]$Arguments
+    );
+
+    if ([string]::IsNullOrEmpty($Command)) {
+        throw 'Please specify a Cmdlet to run as Background Daemon';
+    }
+
+    if (-Not (Test-IcingaFunction $Command)) {
+        throw ([string]::Format('The Cmdlet "{0}" is not available in your session. Please restart the session and try again or verify your input', $Command));
+    }
+
+    $Path = [string]::Format('BackgroundDaemon.EnabledDaemons.{0}', $Command);
+
+    Set-IcingaPowerShellConfig -Path ([string]::Format('{0}.Command', $Path)) -Value $Command;
+    Set-IcingaPowerShellConfig -Path ([string]::Format('{0}.Arguments', $Path)) -Value $Arguments;
+
+    Write-Host ([string]::Format('Background daemon Cmdlet "{0}" has been configured', $Command));
+}

lib/daemon/Start-IcingaPowerShellDaemon.psm1

@@ -6,8 +6,16 @@ function Start-IcingaPowerShellDaemon()
         Use-Icinga -LibOnly -Daemon;
 
         try {
-            # Todo: Add dynamic loading of enabled background tasks
-            Start-IcingaServiceCheckDaemon;
+            $EnabledDaemons = Get-IcingaBackgroundDaemons;
+            
+            foreach ($daemon in $EnabledDaemons.Keys) {
+                if (-Not (Test-IcingaFunction $daemon)) {
+                    continue;
+                }
+
+                $daemonArgs = $EnabledDaemons[$daemon];
+                &$daemon @daemonArgs;
+            }
         } catch {
             # Todo: Add exception handling
         }

lib/daemon/Unregister-IcingaBackgroundDaemon.psm1

@@ -0,0 +1,17 @@
+function Unregister-IcingaBackgroundDaemon()
+{
+    param(
+        [string]$BackgroundDaemon,
+        [hashtable]$Arguments
+    );
+
+    if ([string]::IsNullOrEmpty($BackgroundDaemon)) {
+        throw 'Please specify a Cmdlet to remove from running as Background Daemon';
+    }
+
+    $Path = [string]::Format('BackgroundDaemon.EnabledDaemons.{0}', $BackgroundDaemon);
+
+    Remove-IcingaPowerShellConfig -Path $Path;
+
+    Write-Host 'Background daemon has been removed';
+}