307 lines
7.6 KiB
PHP
307 lines
7.6 KiB
PHP
<?php
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namespace danog\MadelineProto\Db;
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use Amp\Postgres\Pool;
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use Amp\Producer;
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use Amp\Promise;
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use Amp\Sql\ResultSet;
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use Amp\Success;
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use danog\MadelineProto\Db\Driver\Postgres;
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use danog\MadelineProto\Logger;
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use danog\MadelineProto\Settings\Database\Postgres as DatabasePostgres;
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use function Amp\call;
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/**
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* Postgres database backend.
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*/
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class PostgresArray extends SqlArray
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{
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protected string $table;
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public DatabasePostgres $dbSettings;
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private Pool $db;
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// Legacy
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protected array $settings;
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/**
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* Initialize on startup.
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*
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* @return \Generator
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*/
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public function initStartup(): \Generator
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{
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return $this->initConnection($this->dbSettings);
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}
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public function __toString(): string
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{
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return $this->table;
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}
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/**
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* Initialize connection.
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*
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* @param DatabasePostgres $settings
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* @return \Generator
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*/
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public function initConnection($settings): \Generator
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{
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if (!isset($this->db)) {
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$this->db = yield from Postgres::getConnection($settings);
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}
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}
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/**
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* Set value for an offset.
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*
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* @link https://php.net/manual/en/arrayiterator.offsetset.php
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*
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* @param string $index <p>
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* The index to set for.
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* </p>
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* @param $value
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*
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* @throws \Throwable
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*/
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public function offsetSet($index, $value): Promise
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{
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if ($this->getCache($index) === $value) {
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return new Success();
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}
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$this->setCache($index, $value);
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$request = $this->request(
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"
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INSERT INTO \"{$this->table}\"
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(key,value)
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VALUES (:index, :value)
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ON CONFLICT (key) DO UPDATE SET value = :value
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",
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[
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'index' => $index,
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'value' => \serialize($value),
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]
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);
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//Ensure that cache is synced with latest insert in case of concurrent requests.
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$request->onResolve(fn () => $this->setCache($index, $value));
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return $request;
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}
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/**
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* Create table for property.
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*
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* @return \Generator
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*
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* @throws \Throwable
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*
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* @psalm-return \Generator<int, Promise, mixed, void>
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*/
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protected function prepareTable(): \Generator
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{
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Logger::log("Creating/checking table {$this->table}", Logger::WARNING);
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yield $this->request("
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CREATE TABLE IF NOT EXISTS \"{$this->table}\"
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(
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\"key\" VARCHAR(255) NOT NULL,
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\"value\" BYTEA NULL,
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\"ts\" TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
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CONSTRAINT \"{$this->table}_pkey\" PRIMARY KEY(\"key\")
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);
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");
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yield $this->request("
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DROP TRIGGER IF exists \"{$this->table}_update_ts_trigger\" ON \"{$this->table}\";
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");
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yield $this->request("
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CREATE TRIGGER \"{$this->table}_update_ts_trigger\" BEFORE UPDATE ON \"{$this->table}\" FOR EACH ROW EXECUTE PROCEDURE update_ts();
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");
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}
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public function __sleep()
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{
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return ['table', 'dbSettings'];
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}
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/**
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* Check if key isset.
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*
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* @param $key
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*
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* @return Promise<bool> true if the offset exists, otherwise false
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*/
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public function isset($key): Promise
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{
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return call(fn () => yield $this->offsetGet($key) !== null);
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}
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public function offsetGet($offset): Promise
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{
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return call(function () use ($offset) {
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if ($cached = $this->getCache($offset)) {
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return $cached;
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}
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$row = yield $this->request(
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"SELECT value FROM \"{$this->table}\" WHERE key = :index LIMIT 1",
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['index' => $offset]
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);
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if ($value = $this->getValue($row)) {
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$this->setCache($offset, $value);
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}
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return $value;
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});
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}
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/**
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* Unset value for an offset.
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*
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* @link https://php.net/manual/en/arrayiterator.offsetunset.php
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*
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* @param string $index <p>
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* The offset to unset.
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* </p>
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*
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* @return Promise
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* @throws \Throwable
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*/
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public function offsetUnset($index): Promise
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{
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$this->unsetCache($index);
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return $this->request(
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"
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DELETE FROM \"{$this->table}\"
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WHERE key = :index
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",
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['index' => $index]
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);
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}
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/**
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* Get array copy.
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*
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* @return Promise<array>
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* @throws \Throwable
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*/
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public function getArrayCopy(): Promise
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{
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return call(function () {
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$iterator = $this->getIterator();
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$result = [];
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while (yield $iterator->advance()) {
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[$key, $value] = $iterator->getCurrent();
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$result[$key] = $value;
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}
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return $result;
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});
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}
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public function getIterator(): Producer
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{
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return new Producer(function (callable $emit) {
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$request = yield $this->db->execute("SELECT key, value FROM \"{$this->table}\"");
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while (yield $request->advance()) {
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$row = $request->getCurrent();
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yield $emit([$row['key'], $this->getValue($row)]);
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}
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});
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}
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/**
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* Count elements.
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*
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* @link https://php.net/manual/en/arrayiterator.count.php
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* @return Promise<int> The number of elements or public properties in the associated
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* array or object, respectively.
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* @throws \Throwable
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*/
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public function count(): Promise
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{
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return call(function () {
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$row = yield $this->request("SELECT count(key) as count FROM \"{$this->table}\"");
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return $row[0]['count'] ?? 0;
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});
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}
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private function getValue(array $row)
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{
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if ($row) {
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if (!empty($row[0]['value'])) {
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$row = \reset($row);
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}
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return \unserialize($row['value']);
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}
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return null;
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}
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protected function renameTable(string $from, string $to): \Generator
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{
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Logger::log("Renaming table {$from} to {$to}", Logger::WARNING);
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yield $this->request("
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ALTER TABLE \"{$from}\" RENAME TO \"{$to}\";
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");
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yield $this->request("
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DROP TABLE IF EXISTS \"{$from}\";
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");
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}
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/**
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* Perform async request to db.
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*
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* @param string $query
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* @param array $params
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*
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* @return Promise
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* @throws \Throwable
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*/
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private function request(string $query, array $params = []): Promise
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{
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return call(function () use ($query, $params) {
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Logger::log([$query, $params], Logger::VERBOSE);
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if (empty($this->db) || !$this->db->isAlive()) {
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Logger::log('No database connection', Logger::WARNING);
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return [];
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}
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if (
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!empty($params['index'])
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&& !\mb_check_encoding($params['index'], 'UTF-8')
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) {
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$params['index'] = \mb_convert_encoding($params['index'], 'UTF-8');
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}
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try {
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$request = yield $this->db->execute($query, $params);
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} catch (\Throwable $e) {
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Logger::log($e->getMessage(), Logger::ERROR);
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return [];
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}
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$result = [];
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if ($request instanceof ResultSet) {
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while (yield $request->advance()) {
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$result[] = $request->getCurrent();
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}
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}
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return $result;
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});
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}
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}
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