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Add support for multiple randomly-selected DB readers

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This commit is contained in:
Ryan Cramer
2021-04-19 09:47:14 -04:00
parent 22e5e3989e
commit fb0e7f2ecf
1 changed files with 60 additions and 16 deletions
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76
wire/core/WireDatabasePDO.php
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@@ -255,10 +255,22 @@ class WireDatabasePDO extends Wire implements WireDatabase {
'options' => $options,
);
if(!empty($reader) && (!empty($reader['host']) || !empty($reader['socket']))) {
$reader['dsn'] = self::dsn(array_merge($dsnArray, $reader));
$reader = array_merge($data, $reader);
$data['reader'] = $reader;
if(!empty($reader)) {
if(isset($reader['host']) || isset($reader['socket'])) {
// single reader
$reader['dsn'] = self::dsn(array_merge($dsnArray, $reader));
$reader = array_merge($data, $reader);
$data['reader'] = $reader;
} else {
// multiple readers
$readers = array();
foreach($reader as $r) {
if(empty($r['host']) && empty($r['socket'])) continue;
$r['dsn'] = self::dsn(array_merge($dsnArray, $r));
$readers[] = array_merge($data, $r);
}
$data['reader'] = $readers;
}
}
$database = new WireDatabasePDO($data);
@@ -337,12 +349,22 @@ class WireDatabasePDO extends Wire implements WireDatabase {
public function __construct($dsn, $username = null, $password = null, array $driver_options = array()) {
parent::__construct();
if(is_array($dsn) && isset($dsn['dsn'])) {
// configuration data provided in $dsn argument array
if($username !== null && empty($dsn['user'])) $dsn['user'] = $username;
if($password !== null && empty($dsn['pass'])) $dsn['pass'] = $password;
if(!isset($dsn['options'])) $dsn['options'] = $driver_options;
$this->pdoConfig = array_merge($this->pdoConfig, $dsn);
if(!empty($this->pdoConfig['reader']['dsn'])) $this->reader['has'] = true;
if(!empty($this->pdoConfig['reader'])) {
if(!empty($this->pdoConfig['reader']['dsn'])) {
// single reader
$this->reader['has'] = true;
} else if(!empty($this->pdoConfig['reader'][0]['dsn'])) {
// multiple readers
$this->reader['has'] = true;
}
}
} else {
// configuration data in direct arguments
$this->pdoConfig['dsn'] = $dsn;
$this->pdoConfig['user'] = $username;
$this->pdoConfig['pass'] = $password;
@@ -462,20 +484,42 @@ class WireDatabasePDO extends Wire implements WireDatabase {
*/
protected function pdoReader() {
if(!$this->allowReader()) return $this->pdoWriter();
if(!$this->reader['pdo']) {
$this->reader['init'] = false;
$pdo = new \PDO(
$this->pdoConfig['reader']['dsn'],
$this->pdoConfig['reader']['user'],
$this->pdoConfig['reader']['pass'],
$this->pdoConfig['reader']['options']
);
$this->reader['pdo'] = $pdo;
$this->_init($pdo);
} else {
if($this->reader['pdo']) {
$pdo = $this->reader['pdo'];
$this->pdoLast = $pdo;
return $pdo;
}
$this->reader['init'] = false;
$lastException = null;
if(isset($this->pdoConfig['reader']['dsn'])) {
// just one reader
$readers = array($this->pdoConfig['reader']);
} else {
// randomly select a reader
$readers = $this->pdoConfig['reader'];
shuffle($readers);
}
do {
// try readers till we find one that gives us a connection
$reader = array_shift($readers);
try {
$pdo = new \PDO($reader['dsn'], $reader['user'], $reader['pass'], $reader['options']);
} catch(\PDOException $e) {
$pdo = null;
$lastException = $e;
}
} while(!$pdo && count($readers));
if(!$pdo) throw $lastException;
$this->reader['pdo'] = $pdo;
$this->_init($pdo);
$this->pdoLast = $pdo;
return $pdo;
}