Added support for CF.COUNT command (#1052)

Co-authored-by: Vladyslav Vildanov <vladyslavvildanov@Vladyslav-Vildanov-MacBook-Pro.local>

src/ClientContextInterface.php

@@ -61,6 +61,7 @@ use Predis\Command\CommandInterface;
  * @method $this bzmpop(int $timeout, array $keys, string $modifier = 'min', int $count = 1)
  * @method $this cfadd(string $key, $item)
  * @method $this cfaddnx(string $key, $item)
+ * @method $this cfcount(string $key, $item)
  * @method $this cfexists(string $key, $item)
  * @method $this decr($key)
  * @method $this decrby($key, $decrement)

src/ClientInterface.php

@@ -70,6 +70,7 @@ use Predis\Response\Status;
  * @method array             bzmpop(int $timeout, array $keys, string $modifier = 'min', int $count = 1)
  * @method int               cfadd(string $key, $item)
  * @method int               cfaddnx(string $key, $item)
+ * @method int               cfcount(string $key, $item)
  * @method int               cfexists(string $key, $item)
  * @method int               decr(string $key)
  * @method int               decrby(string $key, int $decrement)

src/Command/Redis/CuckooFilter/CFCOUNT.php

@@ -0,0 +1,29 @@
+<?php
+
+/*
+ * This file is part of the Predis package.
+ *
+ * (c) 2009-2020 Daniele Alessandri
+ * (c) 2021-2023 Till Krüss
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Predis\Command\Redis\CuckooFilter;
+
+use Predis\Command\Command as RedisCommand;
+
+/**
+ * @see https://redis.io/commands/cf.count/
+ *
+ * Returns the number of times an item may be in the filter.
+ * Because this is a probabilistic data structure, this may not necessarily be accurate.
+ */
+class CFCOUNT extends RedisCommand
+{
+    public function getId()
+    {
+        return 'CF.COUNT';
+    }
+}

tests/Predis/Command/Redis/CuckooFilter/CFCOUNT_Test.php

@@ -0,0 +1,80 @@
+<?php
+
+/*
+ * This file is part of the Predis package.
+ *
+ * (c) 2009-2020 Daniele Alessandri
+ * (c) 2021-2023 Till Krüss
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Predis\Command\Redis\CuckooFilter;
+
+use Predis\Command\Redis\PredisCommandTestCase;
+
+class CFCOUNT_Test extends PredisCommandTestCase
+{
+    /**
+     * {@inheritDoc}
+     */
+    protected function getExpectedCommand(): string
+    {
+        return CFCOUNT::class;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function getExpectedId(): string
+    {
+        return 'CFCOUNT';
+    }
+
+    /**
+     * @group disconnected
+     */
+    public function testFilterArguments(): void
+    {
+        $actualArguments = ['key', 'item'];
+        $expectedArguments = ['key', 'item'];
+
+        $command = $this->getCommand();
+        $command->setArguments($actualArguments);
+
+        $this->assertSameValues($expectedArguments, $command->getArguments());
+    }
+
+    /**
+     * @group disconnected
+     */
+    public function testParseResponse(): void
+    {
+        $this->assertSame(1, $this->getCommand()->parseResponse(1));
+    }
+
+    /**
+     * @group connected
+     * @return void
+     * @requiresRedisBfVersion >= 1.0.0
+     */
+    public function testReturnsCountOfItemsWithinCuckooFilter(): void
+    {
+        $redis = $this->getClient();
+
+        $redis->cfadd('key', 'item');
+
+        $singleItemResponse = $redis->cfcount('key', 'item');
+        $this->assertSame(1, $singleItemResponse);
+
+        $redis->cfadd('key', 'item');
+        $redis->cfadd('key', 'item');
+
+        $multipleItemsResponse = $redis->cfcount('key', 'item');
+        $this->assertSame(3, $multipleItemsResponse);
+
+        $nonExistingItemResponse = $redis->cfcount('non_existing_key', 'item');
+        $this->assertSame(0, $nonExistingItemResponse);
+    }
+}