709 lines
19 KiB
PHP
709 lines
19 KiB
PHP
<?php namespace ProcessWire;
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/**
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* ProcessWire FileLog
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*
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* Creates and maintains a text-based log file.
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*
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* ProcessWire 3.x, Copyright 2016 by Ryan Cramer
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* https://processwire.com
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*
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*/
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class FileLog extends Wire {
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/**
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* Default size of chunks used for reading from logs
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*
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*/
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const defaultChunkSize = 12288;
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/**
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* Debug mode used during development of this class
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*
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*/
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const debug = false;
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/**
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* Chunk size used when reading from logs and not overridden
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*
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* @var int
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*
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*/
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protected $chunkSize = self::defaultChunkSize;
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/**
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* Full path to log file or false when not yet set
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*
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* @var bool|string
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*
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*/
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protected $logFilename = false;
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/**
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* Log items saved during this request where array keys are md5 hash of log entries and values ignored
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*
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* @var array
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*
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*/
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protected $itemsLogged = array();
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/**
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* Delimiter used in log entries
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*
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* @var string
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*
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*/
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protected $delimeter = "\t";
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/**
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* Maximum allowed line length for a single log line
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*
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* @var int
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*
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*/
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protected $maxLineLength = 8192;
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/**
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* File extension used for log files
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*
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* @var string
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*
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*/
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protected $fileExtension = 'txt';
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/**
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* Path where log files are stored
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*
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* @var string
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*
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*/
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protected $path = '';
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/**
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* Construct the FileLog
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*
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* @param string $path Path where the log will be stored (path should have trailing slash)
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* This may optionally include the filename if you intend to leave the second param blank.
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* @param string $identifier Basename for the log file, not including the extension.
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*
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*/
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public function __construct($path, $identifier = '') {
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if($identifier) {
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$path = rtrim($path, '/') . '/';
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$this->logFilename = "$path$identifier.{$this->fileExtension}";
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} else {
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$this->logFilename = $path;
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$path = dirname($path) . '/';
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}
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$this->path = $path;
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if(!is_dir($path)) $this->wire('files')->mkdir($path);
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}
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public function __get($key) {
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if($key == 'delimiter') return $this->delimeter; // @todo learn how to spell
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return parent::__get($key);
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}
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/**
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* Clean a string for use in a log file entry
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*
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* @param $str
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* @return mixed|string
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*
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*/
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protected function cleanStr($str) {
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$str = str_replace(array("\r\n", "\r", "\n"), ' ', trim($str));
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if(strlen($str) > $this->maxLineLength) $str = substr($str, 0, $this->maxLineLength);
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if(strpos($str, ' ^+') !== false) $str = str_replace(' ^=', ' ^ +', $str); // disallowed sequence
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return $str;
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}
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/**
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* Save the given log entry string
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*
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* @param string $str
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* @param array $options options to modify behavior (Added 3.0.143)
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* - `allowDups` (bool): Allow duplicating same log entry in same runtime/request? (default=true)
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* - `mergeDups` (int): Merge previous duplicate entries that also appear near end of file?
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* To enable, specify int for quantity of bytes to consider from EOF, value of 1024 or higher (default=0, disabled)
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* - `maxTries` (int): If log entry fails to save, maximum times to re-try (default=20)
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* - `maxTriesDelay` (int): Micro seconds (millionths of a second) to delay between re-tries (default=2000)
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* @return bool Success state: true if log written, false if not.
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*
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*/
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public function save($str, array $options = array()) {
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$defaults = array(
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'mergeDups' => 0,
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'allowDups' => true,
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'maxTries' => 20,
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'maxTriesDelay' => 2000,
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);
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if(!$this->logFilename) return false;
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$options = array_merge($defaults, $options);
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$hash = md5($str);
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$ts = date("Y-m-d H:i:s");
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$str = $this->cleanStr($str);
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$line = $this->delimeter . $str; // log entry, excluding timestamp
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$hasLock = false; // becomes true when lock obtained
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$fp = false; // becomes resource when file is open
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// if we've already logged this during this instance, then don't do it again
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if(!$options['allowDups'] && isset($this->itemsLogged[$hash])) return true;
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// determine write mode
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$mode = file_exists($this->logFilename) ? 'a' : 'w';
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if($mode === 'a' && $options['mergeDups']) $mode = 'r+';
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// open the log file
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for($tries = 0; $tries <= $options['maxTries']; $tries++) {
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$fp = fopen($this->logFilename, $mode);
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if($fp) break;
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// if unable to open for reading/writing, see if we can open for append instead
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if($mode === 'r+' && $tries > ($options['maxTries'] / 2)) $mode = 'a';
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usleep($options['maxTriesDelay']);
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}
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// if unable to open, exit now
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if(!$fp) return false;
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// obtain a lock
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for($tries = 0; $tries <= $options['maxTries']; $tries++) {
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$hasLock = flock($fp, LOCK_EX);
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if($hasLock) break;
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usleep($options['maxTriesDelay']);
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}
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// if unable to obtain a lock, we cannot write to the log
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if(!$hasLock) {
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fclose($fp);
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return false;
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}
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// if opened for reading and writing, merge duplicates of $line
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if($mode === 'r+' && $options['mergeDups']) {
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// do not repeat the same log entry in the same chunk
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$chunkSize = (int) $options['mergeDups'];
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if($chunkSize < 1024) $chunkSize = 1024;
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fseek($fp, -1 * $chunkSize, SEEK_END);
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$chunk = fread($fp, $chunkSize);
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// check if our log line already appears in the immediate earlier chunk
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if(strpos($chunk, $line) !== false) {
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// this log entry already appears 1+ times within the last chunk of the file
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// remove the duplicates and replace the chunk
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$chunkLength = strlen($chunk);
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$this->removeLineFromChunk($line, $chunk, $chunkSize);
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fseek($fp, 0, SEEK_END);
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$oldLength = ftell($fp);
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$newLength = $chunkLength > $oldLength ? $oldLength - $chunkLength : 0;
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ftruncate($fp, $newLength);
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fseek($fp, 0, SEEK_END);
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fwrite($fp, $chunk);
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}
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} else {
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// already at EOF because we are appending or creating
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}
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// add the log line
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$result = fwrite($fp, "$ts$line\n");
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// release the lock and close the file
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flock($fp, LOCK_UN);
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fclose($fp);
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if($result && !$options['allowDups']) $this->itemsLogged[$hash] = true;
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// if we were creating the file, make sure it has the right permission
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if($mode === 'w') {
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$files = $this->wire('files'); /** @var WireFileTools $files */
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$files->chmod($this->logFilename);
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}
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return (int) $result > 0;
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}
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/**
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* Remove given $line from $chunk and add counter to end of $line indicating quantity that was removed
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*
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* @param string $line
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* @param string $chunk
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* @param int $chunkSize
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* @since 3.0.143
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*
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*/
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protected function removeLineFromChunk(&$line, &$chunk, $chunkSize) {
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$qty = 0;
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$chunkLines = explode("\n", $chunk);
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foreach($chunkLines as $key => $chunkLine) {
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$x = 1;
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if($key === 0 && strlen($chunk) >= $chunkSize) continue; // skip first line since it’s likely a partial line
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// check if line appears in this chunk line
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if(strpos($chunkLine, $line) === false) continue;
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// check if line also indicates a previous quantity that we should add to our quantity
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if(strpos($chunkLine, ' ^+') !== false) {
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list($chunkLine, $n) = explode(' ^+', $chunkLine, 2);
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if(ctype_digit($n)) $x += (int) $n;
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}
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// verify that these are the same line
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if(strpos(trim($chunkLine) . "\n", trim($line) . "\n") === false) continue;
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// remove the line
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unset($chunkLines[$key]);
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// update the quantity
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$qty += $x;
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}
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if($qty) {
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// append quantity to line, i.e. “^+2” indicating 2 more indentical lines were above
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$chunk = implode("\n", array_values($chunkLines));
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$line .= " ^+$qty";
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}
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}
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public function size() {
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return filesize($this->logFilename);
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}
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public function filename() {
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return basename($this->logFilename);
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}
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public function pathname() {
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return $this->logFilename;
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}
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public function mtime() {
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return filemtime($this->logFilename);
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}
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/**
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* Get lines from the end of a file based on chunk size (deprecated)
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*
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* @param int $chunkSize
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* @param int $chunkNum
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* @return array
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* @deprecated Use find() instead
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*
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*/
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public function get($chunkSize = 0, $chunkNum = 1) {
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return $this->getChunkArray($chunkNum, $chunkSize);
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}
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/**
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* Get lines from the end of a file based on chunk size
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*
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* @param int $chunkSize
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* @param int $chunkNum
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* @param bool $reverse
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* @return array
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*
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*/
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protected function getChunkArray($chunkNum = 1, $chunkSize = 0, $reverse = true) {
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if($chunkSize < 1) $chunkSize = $this->chunkSize;
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$lines = explode("\n", $this->getChunk($chunkNum, $chunkSize, $reverse));
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foreach($lines as $key => $line) {
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$line = trim($line);
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if(!strlen($line)) {
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unset($lines[$key]);
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} else {
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$lines[$key] = $line;
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}
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}
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if($reverse) $lines = array_reverse($lines);
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return $lines;
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}
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/**
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* Get a chunk of data (string) from the end of the log file
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*
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* Returned string is automatically adjusted at the beginning and
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* ending to contain only full log lines.
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*
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* @param int $chunkNum Current chunk/pagination number (default=1, first)
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* @param int $chunkSize Number of bytes to retrieve (default=0, which assigns default chunk size of 12288)
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* @param bool $reverse True=pull from end of file, false=pull from beginning (default=true)
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* @param bool $clean Get a clean chunk that starts at the beginning of a line? (default=true)
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* @return string
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*
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*/
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protected function getChunk($chunkNum = 1, $chunkSize = 0, $reverse = true, $clean = true) {
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if($chunkSize < 1) $chunkSize = $this->chunkSize;
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if($reverse) {
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$offset = -1 * ($chunkSize * $chunkNum);
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} else {
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$offset = $chunkSize * ($chunkNum-1);
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}
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if(self::debug) {
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$this->message("chunkNum=$chunkNum, chunkSize=$chunkSize, offset=$offset, filesize=" . filesize($this->logFilename));
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}
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$data = '';
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$totalChunks = $this->getTotalChunks($chunkSize);
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if($chunkNum > $totalChunks) return $data;
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if(!$fp = fopen($this->logFilename, "r")) return $data;
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fseek($fp, $offset, ($reverse ? SEEK_END : SEEK_SET));
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if($clean) {
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// make chunk include up to beginning of first line
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fseek($fp, -1, SEEK_CUR);
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while(ftell($fp) > 0) {
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$chr = fread($fp, 1);
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if($chr == "\n") break;
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fseek($fp, -2, SEEK_CUR);
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$data = $chr . $data;
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}
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fseek($fp, $offset, ($reverse ? SEEK_END : SEEK_SET));
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}
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// get the big part of the chunk
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$data .= fread($fp, $chunkSize);
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if($clean) {
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// remove last partial line
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$pos = strrpos($data, "\n");
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if($pos) $data = substr($data, 0, $pos);
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}
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fclose($fp);
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return $data;
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}
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/**
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* Get the total number of chunks in the file
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*
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* @param int $chunkSize
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* @return int
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*
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*/
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protected function getTotalChunks($chunkSize = 0) {
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if($chunkSize < 1) $chunkSize = $this->chunkSize;
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$filesize = filesize($this->logFilename);
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return $filesize > 0 ? ceil($filesize / $chunkSize) : 0;
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}
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/**
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* Get total number of lines in the log file
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*
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* @return int
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*
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*/
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public function getTotalLines() {
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if(!is_readable($this->logFilename)) return 0;
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if(filesize($this->logFilename) < $this->chunkSize) {
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$data = file($this->logFilename);
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return count($data);
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}
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if(!$fp = fopen($this->logFilename, "r")) return 0;
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$totalLines = 0;
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while(!feof($fp)) {
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$data = fread($fp, $this->chunkSize);
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$totalLines += substr_count($data, "\n");
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}
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fclose($fp);
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return $totalLines;
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}
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/**
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* Get log lines that lie within a date range
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*
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* @param int $dateFrom Starting date (unix timestamp or strtotime compatible string)
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* @param int $dateTo Ending date (unix timestamp or strtotime compatible string)
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* @param int $pageNum Current pagination number (default=1)
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* @param int $limit Items per pagination (default=100), or specify 0 for no limit.
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* @return array
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*
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*/
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public function getDate($dateFrom, $dateTo = 0, $pageNum = 1, $limit = 100) {
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$options = array(
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'dateFrom' => $dateFrom,
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'dateTo' => $dateTo,
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);
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return $this->find($limit, $pageNum, $options);
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}
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/**
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* Return lines from the end of the log file, with various options
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*
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* @param int $limit Number of items to return (per pagination), or 0 for no limit.
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* @param int $pageNum Current pagination (default=1)
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* @param array $options
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* - text (string): Return only lines containing the given string of text
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* - reverse (bool): True=find from end of file, false=find from beginning (default=true)
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* - toFile (string): Send results to the given basename (default=none)
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* - dateFrom (unix timestamp): Return only lines newer than the given date (default=oldest)
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* - dateTo (unix timestamp): Return only lines older than the given date (default=now)
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* Note: dateFrom and dateTo may be combined to return a range.
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* @return int|array of strings (associative), each indexed by string containing slash separated
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* numeric values of: "current/total/start/end/total" which is useful with pagination.
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* If the 'toFile' option is used, then return value is instead an integer qty of lines written.
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* @throws \Exception on fatal error
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*
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*/
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public function find($limit = 100, $pageNum = 1, array $options = array()) {
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$defaults = array(
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'text' => null,
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'dateFrom' => 0,
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'dateTo' => 0,
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'reverse' => true,
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'toFile' => '',
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);
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$options = array_merge($defaults, $options);
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$hasFilters = !empty($options['text']);
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if($options['dateFrom'] || $options['dateTo']) {
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if(!$options['dateTo']) $options['dateTo'] = time();
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if(!ctype_digit("$options[dateFrom]")) $options['dateFrom'] = strtotime($options['dateFrom']);
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if(!ctype_digit("$options[dateTo]")) $options['dateTo'] = strtotime($options['dateTo']);
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$hasFilters = true;
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}
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if($options['toFile']) {
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$toFile = $this->path . basename($options['toFile']);
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$fp = fopen($toFile, 'w');
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if(!$fp) throw new \Exception("Unable to open file for writing: $toFile");
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} else {
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$toFile = '';
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$fp = null;
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}
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$lines = array();
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$start = ($pageNum-1) * $limit;
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$end = $start + $limit;
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$cnt = 0; // number that will be written or returned by this
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$n = 0; // number total
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$chunkNum = 0;
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$totalChunks = $this->getTotalChunks($this->chunkSize);
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$stopNow = false;
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$chunkLineHashes = array();
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while($chunkNum <= $totalChunks && !$stopNow) {
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$chunk = $this->getChunkArray(++$chunkNum, 0, $options['reverse']);
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if(empty($chunk)) break;
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foreach($chunk as $line) {
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$line = trim($line);
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$hash = md5($line);
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$valid = !isset($chunkLineHashes[$hash]);
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$chunkLineHashes[$hash] = 1;
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if($valid) $valid = $this->isValidLine($line, $options, $stopNow);
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if(!$hasFilters && $limit && count($lines) >= $limit) $stopNow = true;
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if($stopNow) break;
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if(!$valid) continue;
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$n++;
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if($limit && ($n <= $start || $n > $end)) continue;
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$cnt++;
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if($fp) {
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fwrite($fp, $line . "\n");
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} else {
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if(self::debug) $line .= " (line $n, chunk $chunkNum, hash=$hash)";
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$lines[$n] = $line;
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}
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}
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}
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$total = $hasFilters ? $n : $this->getTotalLines();
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$end = $start + count($lines);
|
||
if($end > $total) $end = $total;
|
||
if(count($lines) < $limit && $total > $end) $total = $end;
|
||
|
||
if($fp) {
|
||
fclose($fp);
|
||
$this->wire('files')->chmod($toFile);
|
||
return $cnt;
|
||
}
|
||
|
||
foreach($lines as $key => $line) {
|
||
unset($lines[$key]);
|
||
$lines["$key/$total/$start/$end/$limit"] = $line;
|
||
}
|
||
return $lines;
|
||
}
|
||
|
||
/**
|
||
* Returns whether the given log line is valid to be considered a log entry
|
||
*
|
||
* @param $line
|
||
* @param array $options
|
||
* @param bool $stopNow Populates this with true when it can determine no more lines are necessary.
|
||
* @return bool|int Returns boolean true if valid, false if not.
|
||
* If valid as a result of a date comparison, the unix timestmap for the line is returned.
|
||
*
|
||
*/
|
||
protected function isValidLine($line, array $options, &$stopNow) {
|
||
// 4 7 10
|
||
// $test = '2013-10-22 15:18:43';
|
||
if(strlen($line) < 20) return false;
|
||
if($line[19] != $this->delimeter) return false;
|
||
if($line[4] != "-") return false;
|
||
if($line[7] != "-") return false;
|
||
if($line[10] != " ") return false;
|
||
|
||
if(!empty($options['text'])) {
|
||
if(stripos($line, $options['text']) === false) return false;
|
||
}
|
||
|
||
if(!empty($options['dateFrom']) && !empty($options['dateTo'])) {
|
||
$parts = explode($this->delimeter, $line);
|
||
$date = strtotime($parts[0]);
|
||
if($date >= $options['dateFrom'] && $date <= $options['dateTo']) return true;
|
||
if($date < $options['dateFrom'] && $options['reverse']) $stopNow = true;
|
||
if($date > $options['dateTo'] && !$options['reverse']) $stopNow = true;
|
||
return false;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/**
|
||
* Prune to number of bytes
|
||
*
|
||
* @param $bytes
|
||
* @return bool|int
|
||
* @deprecated use pruneBytes() or pruneLines() instead
|
||
*
|
||
*/
|
||
public function prune($bytes) {
|
||
return $this->pruneBytes($bytes);
|
||
}
|
||
|
||
/**
|
||
* Prune log file to specified number of bytes (from the end)
|
||
*
|
||
* @param int $bytes
|
||
* @return int|bool positive integer on success, 0 if no prune necessary, or boolean false on failure.
|
||
*
|
||
*/
|
||
public function pruneBytes($bytes) {
|
||
|
||
$filename = $this->logFilename;
|
||
|
||
if(!$filename || !file_exists($filename) || filesize($filename) <= $bytes) return 0;
|
||
|
||
$fpr = fopen($filename, "r");
|
||
$fpw = fopen("$filename.new", "w");
|
||
if(!$fpr || !$fpw) return false;
|
||
|
||
fseek($fpr, ($bytes * -1), SEEK_END);
|
||
fgets($fpr, $this->maxLineLength); // first line likely just a partial line, so skip it
|
||
$cnt = 0;
|
||
|
||
while(!feof($fpr)) {
|
||
$line = fgets($fpr, $this->maxLineLength);
|
||
fwrite($fpw, $line);
|
||
$cnt++;
|
||
}
|
||
|
||
fclose($fpw);
|
||
fclose($fpr);
|
||
|
||
if($cnt) {
|
||
$this->wire('files')->unlink($filename, true);
|
||
$this->wire('files')->rename("$filename.new", $filename, true);
|
||
$this->wire('files')->chmod($filename);
|
||
} else {
|
||
$this->wire('files')->unlink("$filename.new", true);
|
||
}
|
||
|
||
return $cnt;
|
||
}
|
||
|
||
/**
|
||
* Prune log file to contain only entries newer than $oldestDate
|
||
*
|
||
* @param int|string $oldestDate
|
||
* @return int Number of lines written
|
||
*
|
||
*/
|
||
public function pruneDate($oldestDate) {
|
||
$toFile = $this->logFilename . '.new';
|
||
$qty = $this->find(0, 1, array(
|
||
'reverse' => false,
|
||
'toFile' => $toFile,
|
||
'dateFrom' => $oldestDate,
|
||
'dateTo' => time(),
|
||
));
|
||
if(file_exists($toFile)) {
|
||
$this->wire('files')->unlink($this->logFilename, true);
|
||
$this->wire('files')->rename($toFile, $this->logFilename, true);
|
||
return $qty;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/**
|
||
* Delete the log file
|
||
*
|
||
* @return bool
|
||
*
|
||
*/
|
||
public function delete() {
|
||
return $this->wire('files')->unlink($this->logFilename, true);
|
||
}
|
||
|
||
public function __toString() {
|
||
return $this->filename();
|
||
}
|
||
|
||
public function setDelimiter($c) {
|
||
$this->delimeter = $c;
|
||
}
|
||
|
||
public function setDelimeter($c) {
|
||
$this->setDelimiter($c);
|
||
}
|
||
|
||
public function setMaxLineLength($c) {
|
||
$this->maxLineLength = (int) $c;
|
||
}
|
||
|
||
public function getMaxLineLength() {
|
||
return $this->maxLineLength;
|
||
}
|
||
|
||
public function setFileExtension($ext) {
|
||
$this->fileExtension = $ext;
|
||
}
|
||
|
||
/**
|
||
* Get or set the default chunk size used when reading from logs and not overridden by method argument
|
||
*
|
||
* @param int $chunkSize Specify chunk size to set, or omit to get
|
||
* @return int
|
||
* @since 3.0.143
|
||
*
|
||
*/
|
||
public function chunkSize($chunkSize = 0) {
|
||
if($chunkSize > 0) $this->chunkSize = (int) $chunkSize;
|
||
return $this->chunkSize;
|
||
}
|
||
}
|
||
|
||
|