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[CACHE][COMPONENT][Tag] Add generic Cache::pagedStream and use it for the tag stream. Note that it doesn't respect scope yet

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Hugo Sales 2021-09-21 15:35:07 +01:00
parent 6cd86cac25
commit 14c173df7a
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2 changed files with 54 additions and 20 deletions
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19
components/Tag/Controller/Tag.php
View File

@ -4,28 +4,19 @@ namespace Component\Tag\Controller;
use App\Core\Cache;
use App\Core\Controller;
use App\Core\DB\DB;
use App\Util\Common;
use Component\Tag\Tag as CompTag;
class Tag extends Controller
{
public function tag(string $tag)
{
// TODO scope
$per_page = Common::config('streams', 'notes_per_page');
$page = $this->int('page') ?: 1;
$tag = CompTag::canonicalTag($tag);
$notes = array_reverse( // TODO meme
Cache::getList(
"tag-{$tag}",
fn () => DB::dql(
'select n from note n join note_tag nt with nt.note_id = n.id ' .
'where nt.canonical = :tag order by nt.created ASC, n.id ASC',
['tag' => $tag]),
offset: $per_page * ($page - 1),
limit: $per_page - 1
)
$notes = Cache::pagedStream(
key: "tag-{$tag}",
query: 'select n from note n join note_tag nt with nt.note_id = n.id where nt.canonical = :tag order by nt.created DESC, n.id DESC',
query_args: ['tag' => $tag],
page: $page
);
return [

51
src/Core/Cache.php
View File

@ -21,6 +21,8 @@
namespace App\Core;
use App\Core\DB\DB;
use App\Entity\Note;
use App\Util\Common;
use App\Util\Exception\ConfigurationException;
use Functional as F;
@ -146,7 +148,7 @@ abstract class Cache
* Retrieve a list from the cache, with a different implementation
* for redis and others, trimming to $max_count if given
*/
public static function getList(string $key, callable $calculate, string $pool = 'default', ?int $max_count = null, ?int $offset = null, ?int $limit = null, float $beta = 1.0): array
public static function getList(string $key, callable $calculate, string $pool = 'default', ?int $max_count = null, ?int $left = null, ?int $right = null, float $beta = 1.0): array
{
if (isset(self::$redis[$pool])) {
if (!($recompute = $beta === INF || !(self::$redis[$pool]->exists($key)))) {
@ -169,10 +171,10 @@ abstract class Cache
$res = $calculate(null, $save);
if ($save) {
self::setList($key, $res, $pool, $max_count, $beta);
return array_slice($res, $offset ?? 0, $limit);
return array_slice($res, $left ?? 0, $right - ($left ?? 0));
}
}
return self::$redis[$pool]->lRange($key, $offset ?? 0, ($offset ?? 0) + ($limit ?? $max_count ?? -1));
return self::$redis[$pool]->lRange($key, $left ?? 0, ($right ?? $max_count ?? 0) - 1);
} else {
return self::get($key, function () use ($calculate, $max_count) {
$res = $calculate(null);
@ -212,7 +214,7 @@ abstract class Cache
self::$redis[$pool]
// doesn't need to be atomic, adding at one end, deleting at the other
->multi(Redis::PIPELINE)
->rPush($key, $value)
->lPush($key, $value)
// trim to $max_count, if given
->lTrim($key, -$max_count ?? 0, -1)
->exec();
@ -238,4 +240,45 @@ abstract class Cache
return self::delete($key, $pool);
}
}
/**
* @param null|callable(int $offset, int $lenght): Note[] $getter
*/
public static function pagedStream(string $key, ?callable $getter = null, ?string $query = null, array $query_args = null, int $page = 1, ?int $per_page = null, string $pool = 'default', ?int $max_count = null, float $beta = 1.0)
{
// TODO scope
if (is_null($per_page)) {
$per_page = Common::config('streams', 'notes_per_page');
}
if (!is_null($max_count) && $per_page > $max_count || !(is_null($getter) ^ is_null($query))) {
throw new \InvalidArgumentException;
}
if (!is_callable($getter)) {
$getter = function (int $offset, int $lenght) use ($query, $query_args) {
return DB::dql($query, $query_args, options: ['offset' => $offset, 'limit' => $lenght]);
};
}
$requested_left = $offset = $per_page * ($page - 1);
$requested_right = $requested_left + $per_page;
[$stored_left, $stored_right] = F\map(explode(':', self::get("{$key}-bounds", fn () => "{$requested_left}:{$requested_right}")), fn (string $v) => (int) $v);
$lenght = $stored_right - $stored_left;
if (!is_null($max_count) && $lenght > $max_count) {
$lenght = $max_count;
$requested_right = $requested_left + $max_count;
}
if ($stored_left > $requested_left || $stored_right < $requested_right) {
$res = $getter($stored_left, $stored_right);
self::setList($key, value: $res, pool: $pool, max_count: $max_count, beta: $beta);
self::set("{$key}-bounds", "{$stored_left}:{$stored_right}");
return $res;
}
return self::getList($key, fn () => $getter($requested_left, $lenght), max_count: $max_count, left: $requested_left, right: $requested_right, beta: $beta);
}
}