arrel/mediadb.php

90 lines
2.4 KiB
PHP
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<?php
class MediaDB
{
private $handle;
private array $lines = [];
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// TODO: create a persist() method that updates the line if the offset where
// it originally existed in is given by 'ftell'. If it doesn't have
// an ID, then try to find it in the file and if it doesn't exist,
// append
public function __construct()
{
// Just initialize the file handler
$this->handle = fopen($GLOBALS['path_mediadb'], 'r');
if ($this->handle === false)
Json::error('Error opening media DB');
}
private function getLine(): ?string
{
return feof($this->handle) ? null : fgets($this->handle);
}
public static function add(Item $item)
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{
$file = fopen($GLOBALS['path_mediadb'], 'a+');
if ($file === false)
Json::error('Failed opening media DB for adding new Item')->die();
$line = $item->getHash() . ' ' . implode(' ', $item->getTags());
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if (fwrite($file, $line . "\n") == false)
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Json::error('Write operation failed on Item adding')->die();
fclose($file);
// The $this->list will be updated on trying to find new items
}
public function map(callable $func)
{
// First read from what's already in memory
foreach ($this->lines as $key => $i_line) {
if ($func($i_line, $key) === true) return;
}
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// If we run out, read from the file and append to array so the next
// lookup is fast
while ($line = $this->getLine()) {
$this->lines[] = $line;
// NOTE: We are kinda assuming that the keys are autoincrementing
// unsigned integers... I think it should be fine, but o_0
$key = count($this->lines) - 1;
if ($func($line, $key) === true) return;
}
}
// ---- ITEM OPERATIONS ----
public function loadItem(string $id): ?Item
{
$key = $this->searchItem($id);
if ($key === null) return null;
return Item::fromLine($this->lines[$key]);
}
private function searchItem(string $id): ?int
{
$ret = null;
$this->map(function ($line, $key) use (&$ret, $id) {
$item = Item::fromLine($line);
if ($item->getHash() == $id) {
$ret = $key;
return true;
}
return false;
});
return $ret;
}
}