HealthController: show Health Check in the UI

fixes #1669

application/controllers/DashboardController.php

@@ -2,7 +2,10 @@
 
 namespace Icinga\Module\Director\Controllers;
 
+use dipl\Html\Html;
+use Icinga\Module\Director\Web\Widget\HealthCheckPluginOutput;
 use Icinga\Module\Director\Dashboard\Dashboard;
+use Icinga\Module\Director\Health;
 use Icinga\Module\Director\Web\Controller\ActionController;
 use Icinga\Module\Director\Web\Form\DbSelectorForm;
 
@@ -43,7 +46,19 @@ class DashboardController extends ActionController
             $dashboard = Dashboard::loadByName($name, $this->db());
             $this->tabs($dashboard->getTabs())->activate($name);
         } else {
-            $this->addSingleTab($this->translate('Overview'));
+            $this->tabs()->add('main', [
+                'label' => $this->translate('Overview'),
+                'url' => 'director'
+            ])->add('health', [
+                'label' => $this->translate('Health'),
+                'url' => 'director/health'
+            ])->activate('main');
+            $state = $this->getHealthState();
+            if ($state->isProblem()) {
+                $this->tabs()->get('health')->setTagParams([
+                    'class' => 'state-' . strtolower($state->getName())
+                ]);
+            }
         }
 
         $cntDashboards = 0;
@@ -66,4 +81,16 @@ class DashboardController extends ActionController
             $this->content()->add($msg);
         }
     }
+
+    /**
+     * @return \Icinga\Module\Director\CheckPlugin\PluginState
+     */
+    protected function getHealthState()
+    {
+        $health = new Health();
+        $health->setDbResourceName($this->getDbResourceName());
+        $output = new HealthCheckPluginOutput($health);
+
+        return $output->getState();
+    }
 }

application/controllers/HealthController.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace Icinga\Module\Director\Controllers;
+
+use dipl\Html\Html;
+use dipl\Html\Icon;
+use Icinga\Module\Director\Web\Widget\HealthCheckPluginOutput;
+use Icinga\Module\Director\Health;
+use Icinga\Module\Director\Web\Controller\ActionController;
+
+class HealthController extends ActionController
+{
+    public function indexAction()
+    {
+        $this->tabs()->add('main', [
+            'label' => $this->translate('Overview'),
+            'url' => 'director'
+        ])->add('health', [
+            'label' => $this->translate('Health'),
+            'url' => 'director/health'
+        ])->activate('health');
+
+        $this->addTitle($this->translate('Director Health'));
+        $health = new Health();
+        $health->setDbResourceName($this->getDbResourceName());
+        $output = new HealthCheckPluginOutput($health);
+        $this->content()->add($output);
+        $this->content()->add([
+            Html::tag('h1', ['class' => 'icon-pin'], $this->translate('Hint: Check Plugin')),
+            Html::tag('p', $this->translate(
+                'Did you know that you can run this entire Health Check'
+                . ' (or just some sections) as an Icinga Check on a regular'
+                . ' base?'
+            ))
+        ]);
+    }
+}

library/Director/CheckPlugin/CheckResults.php

@@ -28,6 +28,11 @@ class CheckResults
         $this->state = new PluginState(0);
     }
 
+    public function getName()
+    {
+        return $this->name;
+    }
+
     public function add(CheckResult $result)
     {
         $this->results[] = $result;
@@ -37,7 +42,26 @@ class CheckResults
         return $this;
     }
 
-    protected function getStateSummaryString()
+    public function getStateCounters()
+    {
+        return $this->stateCounters;
+    }
+
+    public function getProblemSummary()
+    {
+        $summary = [];
+        for ($i = 1; $i <= 3; $i++) {
+            $count = $this->stateCounters[$i];
+            if ($count === 0) {
+                continue;
+            }
+            $summary[PluginState::create($i)->getName()] = $count;
+        }
+
+        return $summary;
+    }
+
+    public function getStateSummaryString()
     {
         $summary = [sprintf(
             '%d tests OK',

library/Director/CheckPlugin/PluginState.php

@@ -30,6 +30,11 @@ class PluginState
         $this->set($state);
     }
 
+    public function isProblem()
+    {
+        return $this->state > 0;
+    }
+
     public function set($state)
     {
         $this->state = $this->getNumericStateFor($state);

library/Director/Web/Widget/HealthCheckPluginOutput.php

@@ -0,0 +1,98 @@
+<?php
+
+namespace Icinga\Module\Director\Web\Widget;
+
+use dipl\Html\Html;
+use dipl\Html\HtmlDocument;
+use dipl\Html\HtmlString;
+use dipl\Translation\TranslationHelper;
+use Icinga\Module\Director\CheckPlugin\PluginState;
+use Icinga\Module\Director\Health;
+
+class HealthCheckPluginOutput extends HtmlDocument
+{
+    use TranslationHelper;
+
+    /** @var Health */
+    protected $health;
+
+    /** @var PluginState */
+    protected $state;
+
+    public function __construct(Health $health)
+    {
+        $this->state = new PluginState('OK');
+        $this->health = $health;
+        $this->process();
+    }
+
+    protected function process()
+    {
+        $checks = $this->health->getAllChecks();
+
+        foreach ($checks as $check) {
+            $this->add([
+                $title = Html::tag('h2', $check->getName()),
+                $ul = Html::tag('ul', ['class' => 'health-check-result'])
+            ]);
+
+            $problems = $check->getProblemSummary();
+            if (! empty($problems)) {
+                $badges = Html::tag('span', ['class' => 'title-badges']);
+                foreach ($problems as $state => $count) {
+                    $badges->add(Html::tag('span', [
+                        'class' => ['badge', 'state-' . strtolower($state)],
+                        'title' => $this->translate('Critical Checks'),
+                    ], $count));
+                }
+                $title->add($badges);
+            }
+
+            foreach ($check->getResults() as $result) {
+                $ul->add(Html::tag('li', [
+                    $this->colorizeState($result->getState()->getName()),
+                    $this->colorizeStates($result->getOutput())
+                ])->setSeparator(' '));
+            }
+            $this->state->raise($check->getState());
+        }
+    }
+
+    public function getState()
+    {
+        return $this->state;
+    }
+
+    protected function colorizeStates($string)
+    {
+        $string = Html::escape($string);
+        $string = preg_replace_callback(
+            "/'([^']+)'/",
+            [$this, 'highlightNames'],
+            $string
+        );
+
+        $string = preg_replace_callback(
+            '/(OK|WARNING|CRITICAL|UNKNOWN)/',
+            [$this, 'getColorized'],
+            $string
+        );
+
+        return new HtmlString($string);
+    }
+
+    protected function colorizeState($state)
+    {
+        return Html::tag('span', ['class' => 'badge state-' . strtolower($state)], $state);
+    }
+
+    protected function highlightNames($match)
+    {
+        return '"' . Html::tag('strong', $match[1]) . '"';
+    }
+
+    protected function getColorized($match)
+    {
+        return $this->colorizeState($match[1]);
+    }
+}

public/css/module.less

@@ -599,6 +599,26 @@ a {
         color: @color-pending;
     }
 }
+ul.tabs a.state-critical {
+  background-color: @colorCritical;
+  font-weight: bold;
+  color: white;
+}
+ul.tabs a.state-warning {
+  background-color: @colorWarning;
+  font-weight: bold;
+  color: white;
+}
+ul.tabs a.state-ok {
+  background-color: @colorOk;
+  font-weight: bold;
+  color: white;
+}
+ul.tabs a.state-unknown {
+  background-color: @colorUnknown;
+  font-weight: bold;
+  color: white;
+}
 
 a:hover::before {
   text-decoration: none;
@@ -1033,6 +1053,25 @@ form div.hint {
 
 /* END of Forms */
 
+ul.health-check-result {
+  list-style-type: none;
+  padding-left: 2em;
+  margin-bottom: 2em;
+  li {
+    line-height: 2em;
+  }
+  .badge {
+    font-weight: bold;
+  }
+}
+
+.title-badges {
+  .badge {
+    font-size: 0.75em;
+    margin-left: 0.5em;
+  }
+}
+
 span.error {
   color: @colorCritical;
 
@@ -1040,6 +1079,7 @@ span.error {
     color: inherit;
   }
 }
+
 p.error {
     color: white;
     padding: 1em 2em;