Extended TDigest Sketch support by implementing TDIGEST.ADD command (#1094)

* Added support for TDIGEST.ADD command

* Codestyle fixes

---------

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

src/ClientContextInterface.php

@@ -173,6 +173,7 @@ use Predis\Command\CommandInterface;
  * @method $this sscan($key, $cursor, array $options = null)
  * @method $this sunion(array|string $keys)
  * @method $this sunionstore($destination, array|string $keys)
+ * @method $this tdigestadd(string $key, float ...$value)
  * @method $this tdigestcreate(string $key, int $compression = 0)
  * @method $this tdigestinfo(string $key)
  * @method $this zadd($key, array $membersAndScoresDictionary)

src/ClientInterface.php

@@ -183,6 +183,7 @@ use Predis\Response\Status;
  * @method string[]          sunion(array|string $keys)
  * @method int               sunionstore(string $destination, array|string $keys)
  * @method int               touch(string[]|string $keyOrKeys, string ...$keys = null)
+ * @method Status            tdigestadd(string $key, float ...$value)
  * @method Status            tdigestcreate(string $key, int $compression = 0)
  * @method array             tdigestinfo(string $key)
  * @method string            xadd(string $key, array $dictionary, string $id = '*', array $options = null)

src/Command/Redis/TDigest/TDIGESTADD.php

@@ -0,0 +1,28 @@
+<?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\TDigest;
+
+use Predis\Command\Command as RedisCommand;
+
+/**
+ * @see https://redis.io/commands/tdigest.add/
+ *
+ * Adds one or more observations to a t-digest sketch.
+ */
+class TDIGESTADD extends RedisCommand
+{
+    public function getId()
+    {
+        return 'TDIGEST.ADD';
+    }
+}

tests/Predis/Command/Redis/TDigest/TDIGESTADD_Test.php

@@ -0,0 +1,82 @@
+<?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\TDigest;
+
+use Predis\Command\Redis\PredisCommandTestCase;
+use Predis\Response\ServerException;
+
+class TDIGESTADD_Test extends PredisCommandTestCase
+{
+    /**
+     * {@inheritDoc}
+     */
+    protected function getExpectedCommand(): string
+    {
+        return TDIGESTADD::class;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function getExpectedId(): string
+    {
+        return 'TDIGESTADD';
+    }
+
+    /**
+     * @group disconnected
+     */
+    public function testFilterArguments(): void
+    {
+        $actualArguments = ['key', 1, 2, 3];
+        $expectedArguments = ['key', 1, 2, 3];
+
+        $command = $this->getCommand();
+        $command->setArguments($actualArguments);
+
+        $this->assertSameValues($expectedArguments, $command->getArguments());
+    }
+
+    /**
+     * @group connected
+     * @return void
+     * @requiresRedisBfVersion >= 2.4.0
+     */
+    public function testAddObservationsIntoGivenTDigestSketch(): void
+    {
+        $redis = $this->getClient();
+
+        $redis->tdigestcreate('key');
+
+        $actualResponse = $redis->tdigestadd('key', 1, 2, 3);
+        $info = $redis->tdigestinfo('key');
+
+        $this->assertEquals('OK', $actualResponse);
+        $this->assertSame(3, $info['Observations']);
+    }
+
+    /**
+     * @group connected
+     * @return void
+     * @requiresRedisBfVersion >= 2.4.0
+     */
+    public function testThrowsExceptionOnNonExistingTDigestSketch(): void
+    {
+        $redis = $this->getClient();
+
+        $this->expectException(ServerException::class);
+        $this->expectExceptionMessage('ERR T-Digest: key does not exist');
+
+        $redis->tdigestadd('key', 1, 2, 3);
+    }
+}