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<?php declare(strict_types=1);
/*
* This file is part of the Monolog package.
*
* (c) Jordi Boggiano <j.boggiano@seld.be>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Monolog\Handler;
use Monolog\Logger;
use Monolog\Utils;
/**
* Stores to any stream resource
*
* Can be used to store into php://stderr, remote and local files, etc.
*
* @author Jordi Boggiano <j.boggiano@seld.be>
*
* @phpstan-import-type FormattedRecord from AbstractProcessingHandler
*/
class StreamHandler extends AbstractProcessingHandler
{
/** @const int */
protected const MAX_CHUNK_SIZE = 2147483647;
/** @const int 10MB */
protected const DEFAULT_CHUNK_SIZE = 10 * 1024 * 1024;
/** @var int */
protected $streamChunkSize;
/** @var resource|null */
protected $stream;
/** @var ?string */
protected $url = null;
/** @var ?string */
private $errorMessage = null;
/** @var ?int */
protected $filePermission;
/** @var bool */
protected $useLocking;
/** @var true|null */
private $dirCreated = null;
/**
* @param resource|string $stream If a missing path can't be created, an UnexpectedValueException will be thrown on first write
* @param int|null $filePermission Optional file permissions (default (0644) are only for owner read/write)
* @param bool $useLocking Try to lock log file before doing any writes
*
* @throws \InvalidArgumentException If stream is not a resource or string
*/
public function __construct($stream, $level = Logger::DEBUG, bool $bubble = true, ?int $filePermission = null, bool $useLocking = false)
{
parent::__construct($level, $bubble);
if (($phpMemoryLimit = Utils::expandIniShorthandBytes(ini_get('memory_limit'))) !== false) {
if ($phpMemoryLimit > 0) {
// use max 10% of allowed memory for the chunk size, and at least 100KB
$this->streamChunkSize = min(static::MAX_CHUNK_SIZE, max((int) ($phpMemoryLimit / 10), 100 * 1024));
} else {
// memory is unlimited, set to the default 10MB
$this->streamChunkSize = static::DEFAULT_CHUNK_SIZE;
}
} else {
// no memory limit information, set to the default 10MB
$this->streamChunkSize = static::DEFAULT_CHUNK_SIZE;
}
if (is_resource($stream)) {
$this->stream = $stream;
stream_set_chunk_size($this->stream, $this->streamChunkSize);
} elseif (is_string($stream)) {
$this->url = Utils::canonicalizePath($stream);
} else {
throw new \InvalidArgumentException('A stream must either be a resource or a string.');
}
$this->filePermission = $filePermission;
$this->useLocking = $useLocking;
}
/**
* {@inheritDoc}
*/
public function close(): void
{
if ($this->url && is_resource($this->stream)) {
fclose($this->stream);
}
$this->stream = null;
$this->dirCreated = null;
}
/**
* Return the currently active stream if it is open
*
* @return resource|null
*/
public function getStream()
{
return $this->stream;
}
/**
* Return the stream URL if it was configured with a URL and not an active resource
*
* @return string|null
*/
public function getUrl(): ?string
{
return $this->url;
}
/**
* @return int
*/
public function getStreamChunkSize(): int
{
return $this->streamChunkSize;
}
/**
* {@inheritDoc}
*/
protected function write(array $record): void
{
if (!is_resource($this->stream)) {
$url = $this->url;
if (null === $url || '' === $url) {
throw new \LogicException('Missing stream url, the stream can not be opened. This may be caused by a premature call to close().' . Utils::getRecordMessageForException($record));
}
$this->createDir($url);
$this->errorMessage = null;
set_error_handler([$this, 'customErrorHandler']);
$stream = fopen($url, 'a');
if ($this->filePermission !== null) {
@chmod($url, $this->filePermission);
}
restore_error_handler();
if (!is_resource($stream)) {
$this->stream = null;
throw new \UnexpectedValueException(sprintf('The stream or file "%s" could not be opened in append mode: '.$this->errorMessage, $url) . Utils::getRecordMessageForException($record));
}
stream_set_chunk_size($stream, $this->streamChunkSize);
$this->stream = $stream;
}
$stream = $this->stream;
if (!is_resource($stream)) {
throw new \LogicException('No stream was opened yet' . Utils::getRecordMessageForException($record));
}
if ($this->useLocking) {
// ignoring errors here, there's not much we can do about them
flock($stream, LOCK_EX);
}
$this->streamWrite($stream, $record);
if ($this->useLocking) {
flock($stream, LOCK_UN);
}
}
/**
* Write to stream
* @param resource $stream
* @param array $record
*
* @phpstan-param FormattedRecord $record
*/
protected function streamWrite($stream, array $record): void
{
fwrite($stream, (string) $record['formatted']);
}
private function customErrorHandler(int $code, string $msg): bool
{
$this->errorMessage = preg_replace('{^(fopen|mkdir)\(.*?\): }', '', $msg);
return true;
}
private function getDirFromStream(string $stream): ?string
{
$pos = strpos($stream, '://');
if ($pos === false) {
return dirname($stream);
}
if ('file://' === substr($stream, 0, 7)) {
return dirname(substr($stream, 7));
}
return null;
}
private function createDir(string $url): void
{
// Do not try to create dir if it has already been tried.
if ($this->dirCreated) {
return;
}
$dir = $this->getDirFromStream($url);
if (null !== $dir && !is_dir($dir)) {
$this->errorMessage = null;
set_error_handler([$this, 'customErrorHandler']);
$status = mkdir($dir, 0777, true);
restore_error_handler();
if (false === $status && !is_dir($dir) && strpos((string) $this->errorMessage, 'File exists') === false) {
throw new \UnexpectedValueException(sprintf('There is no existing directory at "%s" and it could not be created: '.$this->errorMessage, $dir));
}
}
$this->dirCreated = true;
}
}
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