ge-tracker / laravel-redis-paginator
Create a Laravel Paginator or LengthAwarePaginator from a Redis sorted set
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Requires
- php: ^8.0
- illuminate/redis: ^8.0|^9.0|^10.0
- illuminate/support: ^8.0|^9.0|^10.0
Requires (Dev)
- friendsofphp/php-cs-fixer: ^3.6
- gtjamesa/php-standards: ^2.0
- laravel/legacy-factories: ^1.0.4
- orchestra/testbench: ^6.0|^7.0|^8.0
- phpunit/phpunit: ^9.0
README
Ever wanted to display paginated sorted sets at scale? A great example of this would be a leaderboard for a game, or for a website with a large userbase. This package will create a Laravel LengthAwarePaginator
from a Redis sorted set. As a sorted set, by definition, is always sorted, it allows a large number of records to be paginated, with very little overhead.
Installation
You can install the package via composer:
composer require ge-tracker/laravel-redis-paginator
Usage
Initialise the paginator by using dependency injection or the provided RedisPaginator
facade. The example below will interact with the leaderboard
sorted set. We leverage Laravel's Redis interface, which will honour any prefixing and clustering options that you have configured on your application.
Here is an example of a paginated sorted set in action:
public function index(LaravelRedisPaginator $redisPaginator) { $users = $redisPaginator->perPage(25)->paginate('leaderboard'); return view('leaderboard', compact('users')); }
Sorting
The sortAsc
and sortDesc
methods allow you to choose the order of the returned results. The default sorting is in ascending order.
$usersAsc = $redisPaginator->sortAsc()->paginate('leaderboard'); $usersDesc = $redisPaginator->sortDesc()->paginate('leaderboard');
Get the rank and page for a user
You may want to display the user's rank in the sorted set, as well as a link to jump to the page that contains their name. This can be achieved by using the rank()
method. A MemberRank
object will be returned which contains the score
, rank
, and page
properties:
public function show(User $user, LaravelRedisPaginator $redisPaginator) { $memberRank = $redisPaginator->rank('user:' . $user->id, 'leaderboard'); dump($memberRank->score, $memberRank->rank, $memberRank->page); }
Using the facade
For those of you who prefer facades over dependency injection, that option is also available:
public function index() { $users = RedisPaginator::perPage(25)->paginate('leaderboard'); return view('leaderboard', compact('users')); }
Selecting a page to view
The current page can be set by using the page()
method, or by using the method parameters. Under the hood, the package uses Laravel's default Paginator
's page resolution, which means that the page can also be specified via the query string.
// Using the fluent interface $users = $redisPaginator->page(5)->paginate('leaderboard'); // Using method parameters $users = $redisPaginator->paginate('leaderboard', 'page', 5); // https://www.example.com/leaderboard?page=5 $users = $redisPaginator->paginate('leaderboard');
Resolving Eloquent models
Given that Redis an in-memory data structure store, and not a relational database, it is very likely that the real data relating to your paginated data (leaderboard?) is not wholly stored in Redis. This data will need to be loaded once you have fetched your paginated results, and this package will handle that for you.
In this example, we assume that you have stored your data in the following format:
First, create a Redis resolver. This can be placed anywhere your application, such as app/RedisResolvers/UserResolver.php
.
The $modelKey
property should correspond to the key that you are using to generate your Redis members. This will generally be id
or uuid
. The $scoreField
property defines the field that will be mapped onto your Eloquent model, or merged into your results array.
<?php namespace App\RedisResolvers; use App\User; use GeTracker\LaravelRedisPaginator\Resolvers\AbstractResolver; class UserResolver extends AbstractResolver { // Defaults shown below, can be omitted protected $modelKey = 'id'; protected $scoreField = 'score'; /** * Load Eloquent models */ protected function resolveModels(array $keys) { return User::whereIn('id', $keys)->get(); } /** * Resolve a key from Redis to an Eloquent incrementing ID or UUID */ protected function resolveKey($key) { return (int)str_replace('user:', '', $key); } }
The resolveKey()
method will take a single key (Redis member), and allow you to transform it. In the example above, we are stripping user:
from the string, before casting it to an integer.
You can then define resolveModels()
that accepts an array of resolved keys to be queried.
Finally, we must set our model resolver before running the query:
$users = $this->paginator ->setModelResolver(new \App\RedisResolvers\UserResolver()) ->paginate('leaderboard');
We can now access our full User model, as well as the score that has been loaded from Redis:
echo $users[0]->name . ' -> ' . $users[0]->score;
Testing
composer test
Changelog
Please see CHANGELOG for more information on what has changed recently.
Contributing
Please see CONTRIBUTING for details.
Security
If you discover any security related issues, please email james@ge-tracker.com instead of using the issue tracker.
Credits
License
The MIT License (MIT). Please see License File for more information.