1 files changed, 164 insertions, 0 deletions
diff --git a/library/Icingadb/Redis/VolatileStateResults.php b/library/Icingadb/Redis/VolatileStateResults.php
new file mode 100644
index 0000000..186022a
--- /dev/null
+++ b/library/Icingadb/Redis/VolatileStateResults.php
@@ -0,0 +1,164 @@
+<?php
+
+/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Redis;
+
+use Exception;
+use Generator;
+use Icinga\Application\Benchmark;
+use Icinga\Module\Icingadb\Common\IcingaRedis;
+use Icinga\Module\Icingadb\Model\Host;
+use Icinga\Module\Icingadb\Model\Service;
+use ipl\Orm\Query;
+use ipl\Orm\Resolver;
+use ipl\Orm\ResultSet;
+use Predis\Client;
+use RuntimeException;
+
+class VolatileStateResults extends ResultSet
+{
+    /** @var Resolver */
+    private $resolver;
+
+    /** @var Client */
+    private $redis;
+
+    /** @var bool Whether Redis updates were applied */
+    private $updatesApplied = false;
+
+    public static function fromQuery(Query $query)
+    {
+        $self = parent::fromQuery($query);
+        $self->resolver = $query->getResolver();
+
+        try {
+            $self->redis = IcingaRedis::instance()->getConnection();
+        } catch (Exception $e) {
+            // The error has already been logged
+        }
+
+        return $self;
+    }
+
+    /**
+     * Get whether Redis is unavailable
+     *
+     * @return bool
+     */
+    public function isRedisUnavailable(): bool
+    {
+        return $this->redis === null;
+    }
+
+    public function current()
+    {
+        if ($this->redis && ! $this->updatesApplied && ! $this->isCacheDisabled) {
+            $this->rewind();
+        }
+
+        return parent::current();
+    }
+
+    public function key(): int
+    {
+        if ($this->redis && ! $this->updatesApplied && ! $this->isCacheDisabled) {
+            $this->rewind();
+        }
+
+        return parent::key();
+    }
+
+    public function rewind(): void
+    {
+        if ($this->redis && ! $this->updatesApplied && ! $this->isCacheDisabled) {
+            $this->updatesApplied = true;
+            $this->advance();
+
+            Benchmark::measure('Applying Redis updates');
+            $this->applyRedisUpdates();
+            Benchmark::measure('Redis updates applied');
+        }
+
+        parent::rewind();
+    }
+
+    protected function applyRedisUpdates()
+    {
+        $type = null;
+        $behaviors = null;
+
+        $keys = [];
+        $hostStateKeys = [];
+
+        $states = [];
+        $hostStates = [];
+        foreach ($this as $row) {
+            if ($type === null) {
+                $behaviors = $this->resolver->getBehaviors($row->state);
+
+                switch (true) {
+                    case $row instanceof Host:
+                        $type = 'host';
+                        break;
+                    case $row instanceof Service:
+                        $type = 'service';
+                        break;
+                    default:
+                        throw new RuntimeException('Volatile states can only be fetched for hosts and services');
+                }
+            }
+
+            $states[bin2hex($row->id)] = $row->state;
+            if (empty($keys)) {
+                $keys = $row->state->getColumns();
+            }
+
+            if ($type === 'service' && $row->host instanceof Host) {
+                $hostStates[bin2hex($row->host->id)] = $row->host->state;
+                if (empty($hostStateKeys)) {
+                    $hostStateKeys = $row->host->state->getColumns();
+                }
+            }
+        }
+
+        if (empty($states)) {
+            return;
+        }
+
+        foreach ($this->fetchStates("icinga:{$type}:state", array_keys($states), $keys) as $id => $data) {
+            foreach ($data as $key => $value) {
+                $data[$key] = $behaviors->retrieveProperty($value, $key);
+            }
+
+            $states[$id]->setProperties($data);
+        }
+
+        if ($type === 'service' && ! empty($hostStates)) {
+            foreach ($this->fetchStates('icinga:host:state', array_keys($hostStates), $hostStateKeys) as $id => $data) {
+                foreach ($data as $key => $value) {
+                    $data[$key] = $behaviors->retrieveProperty($value, $key);
+                }
+
+                $hostStates[$id]->setProperties($data);
+            }
+        }
+    }
+
+    protected function fetchStates(string $key, array $ids, array $keys): Generator
+    {
+        $results = $this->redis->hmget($key, $ids);
+        foreach ($results as $i => $json) {
+            if ($json !== null) {
+                $data = json_decode($json, true);
+                $keyMap = array_fill_keys($keys, null);
+                unset($keyMap['is_overdue']); // Is calculated by Icinga DB, not Icinga 2, hence it's never in redis
+
+                // TODO: Remove once https://github.com/Icinga/icinga2/issues/9427 is fixed
+                $data['state_type'] = $data['state_type'] === 0 ? 'soft' : 'hard';
+
+                yield $ids[$i] => array_intersect_key(array_merge($keyMap, $data), $keyMap);
+            }
+        }
+    }
+}