MadelineProto/src/danog/MadelineProto/Db/MemoryArray.php

<?php

namespace danog\MadelineProto\Db;

use Amp\Producer;
use Amp\Promise;
use danog\MadelineProto\Logger;
use function Amp\call;

class MemoryArray extends \ArrayIterator implements DbArray
{
    protected function __construct($array = [], $flags = 0)
    {
        parent::__construct((array) $array, $flags | self::STD_PROP_LIST);
    }

    public static function getInstance(string $name, $value = null, string $tablePrefix = '', array $settings = []): Promise
    {
        return call(static function () use ($value) {
            if ($value instanceof MemoryArray) {
                return $value;
            }
            if ($value instanceof DbArray) {
                Logger::log("Loading database to memory. Please wait.", Logger::WARNING);
                $value = yield $value->getArrayCopy();
            }
            return new static($value);
        });
    }

    public function offsetExists($offset)
    {
        throw new \RuntimeException('Native isset not support promises. Use isset method');
    }

    public function isset($key): Promise
    {
        return call(fn () => parent::offsetExists($key));
    }

    public function offsetGet($offset): Promise
    {
        return call(fn () => parent::offsetExists($offset) ? parent::offsetGet($offset) : null);
    }

    public function offsetUnset($offset): Promise
    {
        return call(fn () => parent::offsetUnset($offset));
    }

    public function count(): Promise
    {
        return call(fn () => parent::count());
    }

    public function getArrayCopy(): Promise
    {
        return call(fn () => parent::getArrayCopy());
    }

    public function getIterator(): Producer
    {
        return new Producer(function (callable $emit) {
            foreach ($this as $key => $value) {
                yield $emit([$key, $value]);
            }
        });
    }
}