Site_Size::filesize() - Code Metrics - Inspection of "Daily Inspection: Merge pull request #1078 from hu..." - humanmade/backupwordpress - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Branch — master (cf5579)

unknown

created 2016-09-21 16:57 UTC

Site_Size::filesize() C

↳ Parent: Site_Size

Complexity

Conditions	8
Paths	5

Size

Total Lines	22
Code Lines	10

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	8
eloc	10
nc	5
nop	1
dl	0
loc	22
rs	6.6037
c	0
b	0
f	0

<?php

namespace HM\BackUpWordPress;

use HM\Backdrop\Task;
use Symfony\Component\Finder\Finder;

/**
 * Site Size class
 *
 * Use to calculate the total or partial size of the sites database and files.
 */
class Site_Size {

	private $size = 0;
	private $type = '';
	private $excludes = array();

	/**
	 * Constructor
	 *
	 * Set up some initial conditions including whether we want to calculate the
	 * size of the database, files or both and whether to exclude any files from
	 * the file size calculation.
	 *
	 * @param string $type     Whether to calculate the size of the database, files
	 *                         or both. Should be one of 'file', 'database' or 'complete'
	 * @param array  $excludes An array of exclude rules

	 */
	public function __construct( $type = 'complete', Excludes $excludes = null ) {
		$this->type = $type;
		$this->excludes = $excludes;

	}

	/**
	 * Calculate the size total size of the database + files.
	 *
	 * Doesn't account for any compression that would be gained by zipping.
	 *
	 * @return string

	 */
	public function get_site_size() {

		if ( $this->size ) {
			return $this->size;
		}

		$size = 0;

		// Include database size except for file only schedule.
		if ( 'file' !== $this->type ) {

			$size = (int) get_transient( 'hmbkp_database_size' );

			if ( ! $size ) {

				global $wpdb;
function myFunction($a, $b) {
    // Do something
}

				$tables = $wpdb->get_results( 'SHOW TABLE STATUS FROM `' . DB_NAME . '`', ARRAY_A );

				foreach ( $tables as $table ) {
					$size += (float) $table['Data_length'];
				}

				set_transient( 'hmbkp_database_size', $size, WEEK_IN_SECONDS );
			}
		}

		// Include total size of dirs/files except for database only schedule.
		if ( 'database' !== $this->type ) {

			$root = new \SplFileInfo( Path::get_root() );
			$size += $this->filesize( $root );

		}

		$this->size = $size;
class Id
{
    public $id;

    public function __construct($id)
    {
        $this->id = $id;
    }

}

class Account
{
    /** @var  Id $id */
    public $id;
}

$account_id = false;

if (starsAreRight()) {
    $account_id = new Id(42);
}

$account = new Account();
if ($account instanceof Id)
{
    $account->id = $account_id;
}

		return $size;

	}

	/**
	 * Get the site size formatted
	 *
	 * @see size_format
	 *
	 * @return string
	 */
	public function get_formatted_site_size() {
		return size_format( $this->get_site_size() );
	}

	/**
	 * Whether the total filesize is being calculated
	 *
	 * @return bool
	 */
	public static function is_site_size_being_calculated() {
		return false !== get_transient( 'hmbkp_directory_filesizes_running' );
	}

	/**
	 * Whether the total filesize is cached
	 *
	 * @return bool
	 */
	public function is_site_size_cached() {
		return (bool) $this->get_cached_filesizes();
	}

	/**
	 * Recursively scans a directory to calculate the total filesize
	 *
	 * Locks should be set by the caller with `set_transient( 'hmbkp_directory_filesizes_running', true, HOUR_IN_SECONDS );`
	 *
	 * @return array $directory_sizes    An array of directory paths => filesize sum of all files in directory

	 */
	public function recursive_filesize_scanner() {

		/**
		 * Raise the `memory_limit` and `max_execution time`
		 *
		 * Respects the WP_MAX_MEMORY_LIMIT Constant and the `admin_memory_limit`
		 * filter.
		 */
		@ini_set( 'memory_limit', apply_filters( 'admin_memory_limit', WP_MAX_MEMORY_LIMIT ) );
// For example instead of
@mkdir($dir);

// Better use
if (@mkdir($dir) === false) {
    throw new \RuntimeException('The directory '.$dir.' could not be created.');
}
		@set_time_limit( 0 );
// For example instead of
@mkdir($dir);

// Better use
if (@mkdir($dir) === false) {
    throw new \RuntimeException('The directory '.$dir.' could not be created.');
}

		// Use the cached array directory sizes if available
		$directory_sizes = $this->get_cached_filesizes();

		// If we do have it in cache then let's use it and also clear the lock
		if ( is_array( $directory_sizes ) ) {
			delete_transient( 'hmbkp_directory_filesizes_running' );
			return $directory_sizes;
		}

		// If we don't have it cached then we'll need to re-calculate
		$finder = new Finder();
		$finder->followLinks();
		$finder->ignoreDotFiles( false );
		$finder->ignoreUnreadableDirs( true );

		$files = $finder->in( Path::get_root() );

		foreach ( $files as $file ) {

			if ( $file->isReadable() ) {
				$directory_sizes[ wp_normalize_path( $file->getRealpath() ) ] = $file->getSize();
			} else {
				$directory_sizes[ wp_normalize_path( $file->getRealpath() ) ] = 0;
			}
		}

		file_put_contents( PATH::get_path() . '/.files', gzcompress( json_encode( $directory_sizes ) ) );

		// Remove the lock
		delete_transient( 'hmbkp_directory_filesizes_running' );

		return $directory_sizes;

	}

	/**
	 * Get the total filesize for a given file or directory. Aware of exclusions.
	 *
	 * If $file is a file then return the result of `filesize()` or 0 if it's excluded.
	 * If $file is a directory then recursively calculate the size without
	 * the size of excluded files/directories.
	 *
	 * @param \SplFileInfo   $file The file or directory you want to know the size of.
	 *
	 * @return int           The total filesize of the file or directory without

	 *                       the size of excluded files/directories.
	 */
	public function filesize( \SplFileInfo $file ) {

		// Skip missing or unreadable files.
		if ( ! file_exists( $file->getPathname() ) || ! $file->getRealpath() || ! $file->isReadable() ) {
			return 0;
		}

		// If it's a file then return its filesize or 0 if it's excluded.
		if ( $file->isFile() ) {

			if ( $this->excludes && $this->excludes->is_file_excluded( $file ) ) {

				return 0;
			} else {
				return $file->getSize();
			}
		}

		// If it's a directory then pull it from the cached filesize array.
		if ( $file->isDir() ) {
			return $this->directory_filesize( $file );
		}
	}

	public function directory_filesize( \SplFileInfo $file ) {

		// For performance reasons we cache the root.
		if ( $file->getRealPath() === PATH::get_root() && $this->excludes ) {


			$directory_sizes = get_transient( 'hmbkp_root_size' );

			if ( $directory_sizes ) {
				return (int) $directory_sizes;
			}
		}

		// If we haven't calculated the site size yet then kick it off in a thread.
		$directory_sizes = $this->get_cached_filesizes();

		if ( ! is_array( $directory_sizes ) ) {
			$this->rebuild_directory_filesizes();

			// Intentionally return null so the caller can tell that the size is being calculated.
			return null;
		}

		/*
		 * Ensure we only include files in the current path, the filepaths are stored in keys
		 * so we need to flip for use with preg_grep.
		 */
		$directory_sizes = array_flip( preg_grep( '(' . wp_normalize_path( $file->getRealPath() ) . ')', array_flip( $directory_sizes ) ) );

		if ( $this->excludes ) {


			$excludes = implode( '|', $this->excludes->get_excludes_for_regex() );


			if ( $excludes ) {
				// Use PREG_GREP_INVERT to remove any filepaths which match an exclude rule
				$directory_sizes = array_flip( preg_grep( '(' . $excludes . ')', array_flip( $directory_sizes ), PREG_GREP_INVERT ) );
			}
		}

		$directory_sizes = absint( array_sum( $directory_sizes ) );

		// For performance reasons we cache the root.
		if ( $file->getRealPath() === PATH::get_root() && $this->excludes ) {

			set_transient( 'hmbkp_root_size', $directory_sizes, DAY_IN_SECONDS );
		}

		// Directory size is now just a sum of all files across all sub directories.
		return (int) $directory_sizes;

	}

	public function rebuild_directory_filesizes() {

		if ( $this->is_site_size_being_calculated() ) {
			return false;
		}

		// Mark the filesize as being calculated
		set_transient( 'hmbkp_directory_filesizes_running', true, HOUR_IN_SECONDS );

		// Schedule a Backdrop task to trigger a recalculation
		$task = new Task( array( $this, 'recursive_filesize_scanner' ) );
		$task->schedule();

	}

	public function get_cached_filesizes( $max_age = WEEK_IN_SECONDS ) {

		$cache = PATH::get_path() . '/.files';
		$files = false;

		if ( file_exists( $cache ) ) {

			// If the file is old then regenerate it
			if ( ( time() - filemtime( $cache ) ) <= $max_age ) {
				$files = json_decode( gzuncompress( file_get_contents( $cache ) ), 'ARRAY_A' );
			}
		}

		return $files;

	}
}


GitHub Access Token became invalid

Branch — master (cf5579)

Site_Size::filesize() C

Complexity

Size

Duplication

Importance

1. Pass all data via parameters

2. Create a class that maintains your state

1			<?php
2
3			namespace HM\BackUpWordPress;
4
5			use HM\Backdrop\Task;
6			use Symfony\Component\Finder\Finder;
7
8			/**
9			* Site Size class
10			*
11			* Use to calculate the total or partial size of the sites database and files.
12			*/
13			class Site_Size {
14
15			private $size = 0;
16			private $type = '';
17			private $excludes = array();
18
19			/**
20			* Constructor
21			*
22			* Set up some initial conditions including whether we want to calculate the
23			* size of the database, files or both and whether to exclude any files from
24			* the file size calculation.
25			*
26			* @param string $type Whether to calculate the size of the database, files
27			* or both. Should be one of 'file', 'database' or 'complete'
28			* @param array $excludes An array of exclude rules
			0 ignored issues – show Documentation introduced 2015-11-30 00:15 UTC by Report Bug Copy Issue Report Should the type for parameter `$excludes` not be `null\|Excludes`? This check looks for `@param` annotations where the type inferred by our type inference engine differs from the declared type. It makes a suggestion as to what type it considers more descriptive. Most often this is a case of a parameter that can be null in addition to its declared types. Loading history...
29			*/
30			public function __construct( $type = 'complete', Excludes $excludes = null ) {
31			$this->type = $type;
32			$this->excludes = $excludes;
			0 ignored issues – show Documentation Bug introduced 2015-12-03 00:47 UTC by Report Bug Copy Issue Report It seems like `$excludes` of type `null` or `object<HM\BackUpWordPress\Excludes>` is incompatible with the declared type `array` of property `$excludes`. Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property. Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property.. Loading history...
33			}
34
35			/**
36			* Calculate the size total size of the database + files.
37			*
38			* Doesn't account for any compression that would be gained by zipping.
39			*
40			* @return string
			0 ignored issues – show Documentation introduced 2015-11-21 01:52 UTC by Report Bug Copy Issue Report Should the return type not be `integer\|double`? This check compares the return type specified in the `@return` annotation of a function or method doc comment with the types returned by the function and raises an issue if they mismatch. Loading history...
41			*/
42			public function get_site_size() {
43
44			if ( $this->size ) {
45			return $this->size;
46			}
47
48			$size = 0;
49
50			// Include database size except for file only schedule.
51			if ( 'file' !== $this->type ) {
52
53			$size = (int) get_transient( 'hmbkp_database_size' );
54
55			if ( ! $size ) {
56
57			global $wpdb;
			0 ignored issues – show Compatibility Best Practice introduced 2015-11-21 01:52 UTC by Report Bug Copy Issue Report Use of `global` functionality is not recommended; it makes your code harder to test, and less reusable. Instead of relying on `global` state, we recommend one of these alternatives: 1. Pass all data via parameters function myFunction($a, $b) { // Do something } 2. Create a class that maintains your state class MyClass { private $a; private $b; public function __construct($a, $b) { $this->a = $a; $this->b = $b; } public function myFunction() { // Do something } } Loading history...
58
59			$tables = $wpdb->get_results( 'SHOW TABLE STATUS FROM `' . DB_NAME . '`', ARRAY_A );
60
61			foreach ( $tables as $table ) {
62			$size += (float) $table['Data_length'];
63			}
64
65			set_transient( 'hmbkp_database_size', $size, WEEK_IN_SECONDS );
66			}
67			}
68
69			// Include total size of dirs/files except for database only schedule.
70			if ( 'database' !== $this->type ) {
71
72			$root = new \SplFileInfo( Path::get_root() );
73			$size += $this->filesize( $root );
74
75			}
76
77			$this->size = $size;
			0 ignored issues – show Documentation Bug introduced 2015-11-30 00:15 UTC by Report Bug Copy Issue Report It seems like `$size` can also be of type `double`. However, the property `$size` is declared as type `integer`. Maybe add an additional type check? Our type inference engine has found a suspicous assignment of a value to a property. This check raises an issue when a value that can be of a mixed type is assigned to a property that is type hinted more strictly. For example, imagine you have a variable `$accountId` that can either hold an Id object or false (if there is no account id yet). Your code now assigns that value to the `id` property of an instance of the `Account` class. This class holds a proper account, so the id value must no longer be false. Either this assignment is in error or a type check should be added for that assignment. class Id { public $id; public function __construct($id) { $this->id = $id; } } class Account { /** @var Id $id */ public $id; } $account_id = false; if (starsAreRight()) { $account_id = new Id(42); } $account = new Account(); if ($account instanceof Id) { $account->id = $account_id; } Loading history...
78
79			return $size;
80
81			}
82
83			/**
84			* Get the site size formatted
85			*
86			* @see size_format
87			*
88			* @return string
89			*/
90			public function get_formatted_site_size() {
91			return size_format( $this->get_site_size() );
92			}
93
94			/**
95			* Whether the total filesize is being calculated
96			*
97			* @return bool
98			*/
99			public static function is_site_size_being_calculated() {
100			return false !== get_transient( 'hmbkp_directory_filesizes_running' );
101			}
102
103			/**
104			* Whether the total filesize is cached
105			*
106			* @return bool
107			*/
108			public function is_site_size_cached() {
109			return (bool) $this->get_cached_filesizes();
110			}
111
112			/**
113			* Recursively scans a directory to calculate the total filesize
114			*
115			* Locks should be set by the caller with `set_transient( 'hmbkp_directory_filesizes_running', true, HOUR_IN_SECONDS );`
116			*
117			* @return array $directory_sizes An array of directory paths => filesize sum of all files in directory
			0 ignored issues – show Documentation introduced 2016-02-29 22:46 UTC by Report Bug Copy Issue Report Should the return type not be `array\|object\|integer\|double\|string\|null\|boolean`? Also, consider making the array more specific, something like `array<String>`, or `String[]`. This check compares the return type specified in the `@return` annotation of a function or method doc comment with the types returned by the function and raises an issue if they mismatch. If the return type contains the type array, this check recommends the use of a more specific type like `String[]` or `array<String>`. Loading history...
118			*/
119			public function recursive_filesize_scanner() {
120
121			/**
122			* Raise the `memory_limit` and `max_execution time`
123			*
124			* Respects the WP_MAX_MEMORY_LIMIT Constant and the `admin_memory_limit`
125			* filter.
126			*/
127			@ini_set( 'memory_limit', apply_filters( 'admin_memory_limit', WP_MAX_MEMORY_LIMIT ) );
			0 ignored issues – show Security Best Practice introduced 2015-11-30 00:15 UTC by Report Bug Copy Issue Report It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended. If you suppress an error, we recommend checking for the error condition explicitly: // For example instead of @mkdir($dir); // Better use if (@mkdir($dir) === false) { throw new \RuntimeException('The directory '.$dir.' could not be created.'); } Loading history...
128			@set_time_limit( 0 );
			0 ignored issues – show Security Best Practice introduced 2015-11-30 00:15 UTC by Report Bug Copy Issue Report It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended. If you suppress an error, we recommend checking for the error condition explicitly: // For example instead of @mkdir($dir); // Better use if (@mkdir($dir) === false) { throw new \RuntimeException('The directory '.$dir.' could not be created.'); } Loading history...
129
130			// Use the cached array directory sizes if available
131			$directory_sizes = $this->get_cached_filesizes();
132
133			// If we do have it in cache then let's use it and also clear the lock
134			if ( is_array( $directory_sizes ) ) {
135			delete_transient( 'hmbkp_directory_filesizes_running' );
136			return $directory_sizes;
137			}
138
139			// If we don't have it cached then we'll need to re-calculate
140			$finder = new Finder();
141			$finder->followLinks();
142			$finder->ignoreDotFiles( false );
143			$finder->ignoreUnreadableDirs( true );
144
145			$files = $finder->in( Path::get_root() );
146
147			foreach ( $files as $file ) {
148
149			if ( $file->isReadable() ) {
150			$directory_sizes[ wp_normalize_path( $file->getRealpath() ) ] = $file->getSize();
151			} else {
152			$directory_sizes[ wp_normalize_path( $file->getRealpath() ) ] = 0;
153			}
154			}
155
156			file_put_contents( PATH::get_path() . '/.files', gzcompress( json_encode( $directory_sizes ) ) );
157
158			// Remove the lock
159			delete_transient( 'hmbkp_directory_filesizes_running' );
160
161			return $directory_sizes;
162
163			}
164
165			/**
166			* Get the total filesize for a given file or directory. Aware of exclusions.
167			*
168			* If $file is a file then return the result of `filesize()` or 0 if it's excluded.
169			* If $file is a directory then recursively calculate the size without
170			* the size of excluded files/directories.
171			*
172			* @param \SplFileInfo $file The file or directory you want to know the size of.
173			*
174			* @return int The total filesize of the file or directory without
			0 ignored issues – show Documentation introduced 2016-08-28 16:28 UTC by Report Bug Copy Issue Report Should the return type not be `integer\|null`? This check compares the return type specified in the `@return` annotation of a function or method doc comment with the types returned by the function and raises an issue if they mismatch. Loading history...
175			* the size of excluded files/directories.
176			*/
177			public function filesize( \SplFileInfo $file ) {
178
179			// Skip missing or unreadable files.
180			if ( ! file_exists( $file->getPathname() ) \|\| ! $file->getRealpath() \|\| ! $file->isReadable() ) {
181			return 0;
182			}
183
184			// If it's a file then return its filesize or 0 if it's excluded.
185			if ( $file->isFile() ) {
186
187			if ( $this->excludes && $this->excludes->is_file_excluded( $file ) ) {
			0 ignored issues – show Bug introduced 2016-07-07 17:15 UTC by Report Bug Copy Issue Report The method `is_file_excluded` cannot be called on `$this->excludes` (of type `array`). Methods can only be called on objects. This check looks for methods being called on variables that have been inferred to never be objects. Loading history... Bug Best Practice introduced 2016-07-07 17:15 UTC by Report Bug Copy Issue Report The expression `$this->excludes` of type `array` is implicitly converted to a boolean; are you sure this is intended? If so, consider using `! empty($expr)` instead to make it clear that you intend to check for an array without elements. This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent. Consider making the comparison explicit by using `empty(..)` or `! empty(...)` instead. Loading history...
188			return 0;
189			} else {
190			return $file->getSize();
191			}
192			}
193
194			// If it's a directory then pull it from the cached filesize array.
195			if ( $file->isDir() ) {
196			return $this->directory_filesize( $file );
197			}
198			}
199
200			public function directory_filesize( \SplFileInfo $file ) {
201
202			// For performance reasons we cache the root.
203			if ( $file->getRealPath() === PATH::get_root() && $this->excludes ) {
			0 ignored issues – show Bug Best Practice introduced 2016-07-01 19:07 UTC by Report Bug Copy Issue Report The expression `$this->excludes` of type `array` is implicitly converted to a boolean; are you sure this is intended? If so, consider using `! empty($expr)` instead to make it clear that you intend to check for an array without elements. This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent. Consider making the comparison explicit by using `empty(..)` or `! empty(...)` instead. Loading history...
204
205			$directory_sizes = get_transient( 'hmbkp_root_size' );
206
207			if ( $directory_sizes ) {
208			return (int) $directory_sizes;
209			}
210			}
211
212			// If we haven't calculated the site size yet then kick it off in a thread.
213			$directory_sizes = $this->get_cached_filesizes();
214
215			if ( ! is_array( $directory_sizes ) ) {
216			$this->rebuild_directory_filesizes();
217
218			// Intentionally return null so the caller can tell that the size is being calculated.
219			return null;
220			}
221
222			/*
223			* Ensure we only include files in the current path, the filepaths are stored in keys
224			* so we need to flip for use with preg_grep.
225			*/
226			$directory_sizes = array_flip( preg_grep( '(' . wp_normalize_path( $file->getRealPath() ) . ')', array_flip( $directory_sizes ) ) );
227
228			if ( $this->excludes ) {
			0 ignored issues – show Bug Best Practice introduced 2015-12-03 00:47 UTC by Report Bug Copy Issue Report The expression `$this->excludes` of type `array` is implicitly converted to a boolean; are you sure this is intended? If so, consider using `! empty($expr)` instead to make it clear that you intend to check for an array without elements. This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent. Consider making the comparison explicit by using `empty(..)` or `! empty(...)` instead. Loading history...
229
230			$excludes = implode( '\|', $this->excludes->get_excludes_for_regex() );
			0 ignored issues – show Bug introduced 2015-12-03 00:47 UTC by Report Bug Copy Issue Report The method `get_excludes_for_regex` cannot be called on `$this->excludes` (of type `array`). Methods can only be called on objects. This check looks for methods being called on variables that have been inferred to never be objects. Loading history...
231
232			if ( $excludes ) {
233			// Use PREG_GREP_INVERT to remove any filepaths which match an exclude rule
234			$directory_sizes = array_flip( preg_grep( '(' . $excludes . ')', array_flip( $directory_sizes ), PREG_GREP_INVERT ) );
235			}
236			}
237
238			$directory_sizes = absint( array_sum( $directory_sizes ) );
239
240			// For performance reasons we cache the root.
241			if ( $file->getRealPath() === PATH::get_root() && $this->excludes ) {
			0 ignored issues – show Bug Best Practice introduced 2016-07-01 19:07 UTC by Report Bug Copy Issue Report The expression `$this->excludes` of type `array` is implicitly converted to a boolean; are you sure this is intended? If so, consider using `! empty($expr)` instead to make it clear that you intend to check for an array without elements. This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent. Consider making the comparison explicit by using `empty(..)` or `! empty(...)` instead. Loading history...
242			set_transient( 'hmbkp_root_size', $directory_sizes, DAY_IN_SECONDS );
243			}
244
245			// Directory size is now just a sum of all files across all sub directories.
246			return (int) $directory_sizes;
247
248			}
249
250			public function rebuild_directory_filesizes() {
251
252			if ( $this->is_site_size_being_calculated() ) {
253			return false;
254			}
255
256			// Mark the filesize as being calculated
257			set_transient( 'hmbkp_directory_filesizes_running', true, HOUR_IN_SECONDS );
258
259			// Schedule a Backdrop task to trigger a recalculation
260			$task = new Task( array( $this, 'recursive_filesize_scanner' ) );
261			$task->schedule();
262
263			}
264
265			public function get_cached_filesizes( $max_age = WEEK_IN_SECONDS ) {
266
267			$cache = PATH::get_path() . '/.files';
268			$files = false;
269
270			if ( file_exists( $cache ) ) {
271
272			// If the file is old then regenerate it
273			if ( ( time() - filemtime( $cache ) ) <= $max_age ) {
274			$files = json_decode( gzuncompress( file_get_contents( $cache ) ), 'ARRAY_A' );
275			}
276			}
277
278			return $files;
279
280			}
281			}
282

humanmade / backupwordpress

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Branch — master (cf5579)

Site_Size::filesize() C

Complexity

Size

Duplication

Importance

1. Pass all data via parameters

2. Create a class that maintains your state

Duplication Side-by-Side

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