feat: allow configuring a separate redis instance for use with notify_push

Signed-off-by: Robin Appelman <robin@icewind.nl>

Author: icewind1991

Cargo.lock

@@ -29,7 +29,7 @@ rand = { version = "0.8.5", features = ["small_rng"] }
 ahash = "0.8.11"
 flexi_logger = { version = "0.29.8", features = ["colors"] }
 tokio-stream = { version = "0.1.17", features = ["net"] }
-nextcloud-config-parser = "0.13.1"
+nextcloud-config-parser = "0.14.0"
 url = "2.5.4"
 clap = { version = "4.5.26", features = ["derive"] }
 sd-notify = { version = "0.4.3", optional = true }

Cargo.toml

@@ -146,7 +146,17 @@ Note that Nextcloud loads all files matching `*.config.php` in the config direct
 file.
 You can enable this same behavior by passing the `--glob-config` option.
 
-#####        
+<details>
+<summary>Using a separate redis instance for the push server
+</summary>
+
+You can optionally use a different redis instance for communications between the Nextcloud server and the push daemon.
+
+This allows spreading moving the load away from the normal redis usage or use a redis setup more optimized for the specific usage (`PUBSUB` traffic instead of cache storage).
+
+You can configure this by setting the `notify_push_redis` config option in the `config.php` of the Nextcloud server, this accepts the same options as the normal redis configurations.
+
+</details>
 
 <details>
 <summary>Connecting to redis over TLS

README.md

@@ -14,6 +14,8 @@
 use OCA\NotifyPush\Listener;
 use OCA\NotifyPush\Queue\IQueue;
 use OCA\NotifyPush\Queue\NullQueue;
+use OCA\NotifyPush\Queue\PushRedisFactory;
+use OCA\NotifyPush\Queue\QueueFactory;
 use OCA\NotifyPush\Queue\RedisQueue;
 use OCP\Activity\IManager;
 use OCP\AppFramework\App;
@@ -41,10 +43,11 @@ public function register(IRegistrationContext $context): void {
 		$context->registerCapability(Capabilities::class);
 
 		$context->registerService(IQueue::class, function (ContainerInterface $c) {
-			/** @var RedisFactory $redisFactory */
-			$redisFactory = $c->get(RedisFactory::class);
-			if ($redisFactory->isAvailable()) {
-				return new RedisQueue($redisFactory->getInstance());
+			/** @var PushRedisFactory $factory */
+			$factory = $c->get(PushRedisFactory::class);
+			$redis = $factory->getRedis();
+			if ($redis) {
+				return new RedisQueue($redis);
 			} else {
 				return new NullQueue();
 			}

lib/AppInfo/Application.php

@@ -0,0 +1,98 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2025 Robin Appelman <robin@icewind.nl>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\NotifyPush\Queue;
+
+use OC\RedisFactory;
+use OCP\IConfig;
+
+class PushRedisFactory {
+	private $instance = null;
+
+	public function __construct(
+		private readonly IConfig $config,
+		private readonly RedisFactory $redisFactory,
+	) {
+	}
+
+	/**
+	 * @return \Redis|\RedisCluster|null
+	 * @throws \Exception
+	 */
+	public function getRedis() {
+		if ($this->instance) {
+			return $this->instance;
+		}
+		if ($this->config->getSystemValue('notify_push_redis', []) !== []) {
+			return $this->getSeparateRedis();
+		} elseif ($this->redisFactory->isAvailable()) {
+			return $this->redisFactory->getInstance();
+		} else {
+			return null;
+		}
+	}
+
+	private function getSeparateRedis(): \Redis {
+		$config = $this->config->getSystemValue('notify_push_redis', []);
+		$timeout = $config['timeout'] ?? 0.0;
+		$readTimeout = $config['read_timeout'] ?? 0.0;
+
+		$auth = null;
+		if (isset($config['password']) && (string)$config['password'] !== '') {
+			if (isset($config['user']) && (string)$config['user'] !== '') {
+				$auth = [$config['user'], $config['password']];
+			} else {
+				$auth = $config['password'];
+			}
+		}
+
+		$persistent = $this->config->getSystemValue('notify_push_redis.persistent', true);
+
+		$redis = new \Redis();
+
+		$host = $config['host'] ?? '127.0.0.1';
+		$port = $config['port'] ?? ($host[0] !== '/' ? 6379 : null);
+
+		// Support for older phpredis versions not supporting connectionParameters
+		if (isset($config['ssl_context'])) {
+			// Non-clustered redis requires connection parameters to be wrapped inside `stream`
+			$connectionParameters = [
+				'stream' => $config['ssl_context']
+			];
+			if ($persistent) {
+				/**
+				 * even though the stubs and documentation don't want you to know this,
+				 * pconnect does have the same $connectionParameters argument connect has
+				 *
+				 * https://github.com/phpredis/phpredis/blob/0264de1824b03fb2d0ad515b4d4ec019cd2dae70/redis.c#L710-L730
+				 *
+				 * @psalm-suppress TooManyArguments
+				 */
+				$redis->pconnect($host, $port, $timeout, null, 0, $readTimeout, $connectionParameters);
+			} else {
+				$redis->connect($host, $port, $timeout, null, 0, $readTimeout, $connectionParameters);
+			}
+		} else {
+			if ($persistent) {
+				$redis->pconnect($host, $port, $timeout, null, 0, $readTimeout);
+			} else {
+				$redis->connect($host, $port, $timeout, null, 0, $readTimeout);
+			}
+		}
+
+		if ($auth !== null) {
+			$redis->auth($auth);
+		}
+
+		if (isset($config['dbindex'])) {
+			$redis->select($config['dbindex']);
+		}
+
+		return $redis;
+	}
+}

lib/Queue/PushRedisFactory.php

@@ -18,7 +18,7 @@ pub(super) fn parse_config_file(
         database: Some(config.database.url().parse()?),
         database_prefix: Some(config.database_prefix),
         nextcloud_url: Some(config.nextcloud_url),
-        redis: Some(config.redis),
+        redis: Some(config.notify_push_redis.unwrap_or(config.redis)),
         ..PartialConfig::default()
     })
 }