updraftplus / includes / Google / Logger / Abstract.php

Abstract.php in UpdraftPlus: WP Backup & Migration Plugin 1.16.5, at includes/Google/Logger/Abstract.php

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1	<?php
2	/*
3	* Copyright 2014 Google Inc.
4	*
5	* Licensed under the Apache License, Version 2.0 (the "License");
6	* you may not use this file except in compliance with the License.
7	* You may obtain a copy of the License at
8	*
9	* http://www.apache.org/licenses/LICENSE-2.0
10	*
11	* Unless required by applicable law or agreed to in writing, software
12	* distributed under the License is distributed on an "AS IS" BASIS,
13	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14	* See the License for the specific language governing permissions and
15	* limitations under the License.
16	*/
17
18	if (!class_exists('Google_Client')) {
19	require_once dirname(__FILE__) . '/../autoload.php';
20	}
21
22	/**
23	* Abstract logging class based on the PSR-3 standard.
24	*
25	* NOTE: We don't implement `Psr\Log\LoggerInterface` because we need to
26	* maintain PHP 5.2 support.
27	*
28	* @see https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-3-logger-interface.md
29	*/
30	abstract class Google_Logger_Abstract
31	{
32	/**
33	* Default log format
34	*/
35	const DEFAULT_LOG_FORMAT = "[%datetime%] %level%: %message% %context%\n";
36	/**
37	* Default date format
38	*
39	* Example: 16/Nov/2014:03:26:16 -0500
40	*/
41	const DEFAULT_DATE_FORMAT = 'd/M/Y:H:i:s O';
42
43	/**
44	* System is unusable
45	*/
46	const EMERGENCY = 'emergency';
47	/**
48	* Action must be taken immediately
49	*
50	* Example: Entire website down, database unavailable, etc. This should
51	* trigger the SMS alerts and wake you up.
52	*/
53	const ALERT = 'alert';
54	/**
55	* Critical conditions
56	*
57	* Example: Application component unavailable, unexpected exception.
58	*/
59	const CRITICAL = 'critical';
60	/**
61	* Runtime errors that do not require immediate action but should typically
62	* be logged and monitored.
63	*/
64	const ERROR = 'error';
65	/**
66	* Exceptional occurrences that are not errors.
67	*
68	* Example: Use of deprecated APIs, poor use of an API, undesirable things
69	* that are not necessarily wrong.
70	*/
71	const WARNING = 'warning';
72	/**
73	* Normal but significant events.
74	*/
75	const NOTICE = 'notice';
76	/**
77	* Interesting events.
78	*
79	* Example: User logs in, SQL logs.
80	*/
81	const INFO = 'info';
82	/**
83	* Detailed debug information.
84	*/
85	const DEBUG = 'debug';
86
87	/**
88	* @var array $levels Logging levels
89	*/
90	protected static $levels = array(
91	self::EMERGENCY => 600,
92	self::ALERT => 550,
93	self::CRITICAL => 500,
94	self::ERROR => 400,
95	self::WARNING => 300,
96	self::NOTICE => 250,
97	self::INFO => 200,
98	self::DEBUG => 100,
99	);
100
101	/**
102	* @var integer $level The minimum logging level
103	*/
104	protected $level = self::DEBUG;
105
106	/**
107	* @var string $logFormat The current log format
108	*/
109	protected $logFormat = self::DEFAULT_LOG_FORMAT;
110	/**
111	* @var string $dateFormat The current date format
112	*/
113	protected $dateFormat = self::DEFAULT_DATE_FORMAT;
114
115	/**
116	* @var boolean $allowNewLines If newlines are allowed
117	*/
118	protected $allowNewLines = false;
119
120	/**
121	* @param Google_Client $client The current Google client
122	*/
123	public function __construct(Google_Client $client)
124	{
125	$this->setLevel(
126	$client->getClassConfig('Google_Logger_Abstract', 'level')
127	);
128
129	$format = $client->getClassConfig('Google_Logger_Abstract', 'log_format');
130	$this->logFormat = $format ? $format : self::DEFAULT_LOG_FORMAT;
131
132	$format = $client->getClassConfig('Google_Logger_Abstract', 'date_format');
133	$this->dateFormat = $format ? $format : self::DEFAULT_DATE_FORMAT;
134
135	$this->allowNewLines = (bool) $client->getClassConfig(
136	'Google_Logger_Abstract',
137	'allow_newlines'
138	);
139	}
140
141	/**
142	* Sets the minimum logging level that this logger handles.
143	*
144	* @param integer $level
145	*/
146	public function setLevel($level)
147	{
148	$this->level = $this->normalizeLevel($level);
149	}
150
151	/**
152	* Checks if the logger should handle messages at the provided level.
153	*
154	* @param integer $level
155	* @return boolean
156	*/
157	public function shouldHandle($level)
158	{
159	return $this->normalizeLevel($level) >= $this->level;
160	}
161
162	/**
163	* System is unusable.
164	*
165	* @param string $message The log message
166	* @param array $context The log context
167	*/
168	public function emergency($message, array $context = array())
169	{
170	$this->log(self::EMERGENCY, $message, $context);
171	}
172
173	/**
174	* Action must be taken immediately.
175	*
176	* Example: Entire website down, database unavailable, etc. This should
177	* trigger the SMS alerts and wake you up.
178	*
179	* @param string $message The log message
180	* @param array $context The log context
181	*/
182	public function alert($message, array $context = array())
183	{
184	$this->log(self::ALERT, $message, $context);
185	}
186
187	/**
188	* Critical conditions.
189	*
190	* Example: Application component unavailable, unexpected exception.
191	*
192	* @param string $message The log message
193	* @param array $context The log context
194	*/
195	public function critical($message, array $context = array())
196	{
197	$this->log(self::CRITICAL, $message, $context);
198	}
199
200	/**
201	* Runtime errors that do not require immediate action but should typically
202	* be logged and monitored.
203	*
204	* @param string $message The log message
205	* @param array $context The log context
206	*/
207	public function error($message, array $context = array())
208	{
209	$this->log(self::ERROR, $message, $context);
210	}
211
212	/**
213	* Exceptional occurrences that are not errors.
214	*
215	* Example: Use of deprecated APIs, poor use of an API, undesirable things
216	* that are not necessarily wrong.
217	*
218	* @param string $message The log message
219	* @param array $context The log context
220	*/
221	public function warning($message, array $context = array())
222	{
223	$this->log(self::WARNING, $message, $context);
224	}
225
226	/**
227	* Normal but significant events.
228	*
229	* @param string $message The log message
230	* @param array $context The log context
231	*/
232	public function notice($message, array $context = array())
233	{
234	$this->log(self::NOTICE, $message, $context);
235	}
236
237	/**
238	* Interesting events.
239	*
240	* Example: User logs in, SQL logs.
241	*
242	* @param string $message The log message
243	* @param array $context The log context
244	*/
245	public function info($message, array $context = array())
246	{
247	$this->log(self::INFO, $message, $context);
248	}
249
250	/**
251	* Detailed debug information.
252	*
253	* @param string $message The log message
254	* @param array $context The log context
255	*/
256	public function debug($message, array $context = array())
257	{
258	$this->log(self::DEBUG, $message, $context);
259	}
260
261	/**
262	* Logs with an arbitrary level.
263	*
264	* @param mixed $level The log level
265	* @param string $message The log message
266	* @param array $context The log context
267	*/
268	public function log($level, $message, array $context = array())
269	{
270	if (!$this->shouldHandle($level)) {
271	return false;
272	}
273
274	$levelName = is_int($level) ? array_search($level, self::$levels) : $level;
275	$message = $this->interpolate(
276	array(
277	'message' => $message,
278	'context' => $context,
279	'level' => strtoupper($levelName),
280	'datetime' => new DateTime(),
281	)
282	);
283
284	$this->write($message);
285	}
286
287	/**
288	* Interpolates log variables into the defined log format.
289	*
290	* @param array $variables The log variables.
291	* @return string
292	*/
293	protected function interpolate(array $variables = array())
294	{
295	$template = $this->logFormat;
296
297	if (!$variables['context']) {
298	$template = str_replace('%context%', '', $template);
299	unset($variables['context']);
300	} else {
301	$this->reverseJsonInContext($variables['context']);
302	}
303
304	foreach ($variables as $key => $value) {
305	if (strpos($template, '%'. $key .'%') !== false) {
306	$template = str_replace(
307	'%' . $key . '%',
308	$this->export($value),
309	$template
310	);
311	}
312	}
313
314	return $template;
315	}
316
317	/**
318	* Reverses JSON encoded PHP arrays and objects so that they log better.
319	*
320	* @param array $context The log context
321	*/
322	protected function reverseJsonInContext(array &$context)
323	{
324	if (!$context) {
325	return;
326	}
327
328	foreach ($context as $key => $val) {
329	if (!$val \|\| !is_string($val) \|\| !($val[0] == '{' \|\| $val[0] == '[')) {
330	continue;
331	}
332
333	$json = @json_decode($val);
334	if (is_object($json) \|\| is_array($json)) {
335	$context[$key] = $json;
336	}
337	}
338	}
339
340	/**
341	* Exports a PHP value for logging to a string.
342	*
343	* @param mixed $value The value to
344	*/
345	protected function export($value)
346	{
347	if (is_string($value)) {
348	if ($this->allowNewLines) {
349	return $value;
350	}
351
352	return preg_replace('/[\r\n]+/', ' ', $value);
353	}
354
355	if (is_resource($value)) {
356	return sprintf(
357	'resource(%d) of type (%s)',
358	$value,
359	get_resource_type($value)
360	);
361	}
362
363	if ($value instanceof DateTime) {
364	return $value->format($this->dateFormat);
365	}
366
367	if (version_compare(PHP_VERSION, '5.4.0', '>=')) {
368	// @codingStandardsIgnoreLine
369	$options = JSON_UNESCAPED_SLASHES \| JSON_UNESCAPED_UNICODE;
370
371	if ($this->allowNewLines) {
372	// @codingStandardsIgnoreLine
373	$options \|= JSON_PRETTY_PRINT;
374	}
375
376	return @json_encode($value, $options);
377	}
378
379	return str_replace('\\/', '/', @json_encode($value));
380	}
381
382	/**
383	* Converts a given log level to the integer form.
384	*
385	* @param mixed $level The logging level
386	* @return integer $level The normalized level
387	* @throws Google_Logger_Exception If $level is invalid
388	*/
389	protected function normalizeLevel($level)
390	{
391	if (is_int($level) && array_search($level, self::$levels) !== false) {
392	return $level;
393	}
394
395	if (is_string($level) && isset(self::$levels[$level])) {
396	return self::$levels[$level];
397	}
398
399	throw new Google_Logger_Exception(
400	sprintf("Unknown LogLevel: '%s'", $level)
401	);
402	}
403
404	/**
405	* Writes a message to the current log implementation.
406	*
407	* @param string $message The message
408	*/
409	abstract protected function write($message);
410	}
411