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<?php
class Db_Migrations {
private $base_filename = "schema.sql";
private $base_path;
private $migrations_path;
private $migrations_table;
private $pdo;
private $cached_version;
private $cached_max_version;
function initialize_for_plugin(Plugin $plugin, string $schema_suffix = "sql") {
$plugin_dir = PluginHost::getInstance()->get_plugin_dir($plugin);
$this->initialize($plugin_dir . "/${schema_suffix}",
strtolower("ttrss_migrations_plugin_" . get_class($plugin)));
}
function initialize(string $root_path, string $migrations_table) {
$this->base_path = "$root_path/" . Config::get(Config::DB_TYPE);
$this->migrations_path = $this->base_path . "/migrations";
$this->migrations_table = $migrations_table;
}
function __construct() {
$this->pdo = Db::pdo();
}
private function set_version(int $version) {
$sth = $this->pdo->query("SELECT * FROM {$this->migrations_table}");
if ($res = $sth->fetch()) {
$sth = $this->pdo->prepare("UPDATE {$this->migrations_table} SET schema_version = ?");
} else {
$sth = $this->pdo->prepare("INSERT INTO {$this->migrations_table} (schema_version) VALUES (?)");
}
$sth->execute([$version]);
$this->cached_version = $version;
}
private function get_version() : int {
if (isset($this->cached_version))
return $this->cached_version;
try {
$sth = $this->pdo->query("SELECT * FROM {$this->migrations_table}");
if ($res = $sth->fetch()) {
return (int) $res['schema_version'];
} else {
return -1;
}
} catch (PDOException $e) {
$this->create_migrations_table();
return -1;
}
}
private function create_migrations_table() {
$this->pdo->query("CREATE TABLE IF NOT EXISTS {$this->migrations_table} (schema_version integer not null)");
}
private function migrate_to(int $version) {
try {
$this->pdo->beginTransaction();
foreach ($this->get_lines($version) as $line) {
$this->pdo->query($line);
}
$this->set_version($version);
$this->pdo->commit();
} catch (PDOException $e) {
try {
$this->pdo->rollback();
} catch (PDOException $ie) {
//
}
throw $e;
}
}
private function get_max_version() : int {
if (isset($this->cached_max_version))
return $this->cached_max_version;
$migrations = glob("{$this->migrations_path}/*.sql");
if (count($migrations) > 0) {
natsort($migrations);
$this->cached_max_version = (int) basename(array_pop($migrations), ".sql");
} else {
$this->cached_max_version = 0;
}
return $this->cached_max_version;
}
function migrate() : bool {
for ($i = $this->get_version() + 1; $i <= $this->get_max_version(); $i++)
try {
$this->migrate_to($i);
} catch (PDOException $e) {
user_error("Failed applying migration $i on table {$this->migrations_table}: " . $e->getMessage(), E_USER_WARNING);
//throw $e;
}
return $this->get_version() == $this->get_max_version();
}
private function get_lines(int $version) : array {
if ($version > 0)
$filename = "{$this->migrations_path}/${version}.sql";
else
$filename = "{$this->base_path}/{$this->base_filename}";
if (file_exists($filename)) {
$lines = array_filter(preg_split("/[\r\n]/", file_get_contents($filename)),
function ($line) {
return strlen(trim($line)) > 0 && strpos($line, "--") !== 0;
});
return array_filter(explode(";", implode("", $lines)), function ($line) {
return strlen(trim($line)) > 0;
});
} else {
user_error(E_USER_ERROR, "[migrations] requested schema file ${filename} not found.");
return [];
}
}
}
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