#21: Impelement rule

Magento2/Sniffs/Exceptions/TryProcessSystemResourcesSniff.php

@@ -0,0 +1,79 @@
+<?php
+/**
+ * Copyright © Magento. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento2\Sniffs\Exceptions;
+
+use function array_slice;
+use PHP_CodeSniffer\Sniffs\Sniff;
+use PHP_CodeSniffer\Files\File;
+
+/**
+ * Detects missing try-catch block when processing system resources.
+ */
+class TryProcessSystemResourcesSniff implements Sniff
+{
+    /**
+     * String representation of warning.
+     *
+     * @var string
+     */
+    protected $warningMessage = 'The code must be wrapped with a try block if the method uses system resources.';
+
+    /**
+     * Warning violation code.
+     *
+     * @var string
+     */
+    protected $warningCode = 'MissingTryCatch';
+
+    /**
+     * Search for functions that start with.
+     *
+     * @var array
+     */
+    protected $functions = [
+        'stream_',
+        'socket_',
+    ];
+
+    /**
+     * @inheritDoc
+     */
+    public function register()
+    {
+        return [T_STRING];
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function process(File $phpcsFile, $stackPtr)
+    {
+        $tokens = $phpcsFile->getTokens();
+
+        foreach ($this->functions as $function) {
+            if (strpos($tokens[$stackPtr]['content'], $function) !== 0) {
+                continue;
+            }
+            $tryPosition = $phpcsFile->findPrevious(T_TRY, $stackPtr - 1);
+
+            if ($tryPosition !== false) {
+                $tryTag = $tokens[$tryPosition];
+                $start = $tryTag['scope_opener'];
+                $end = $tryTag['scope_closer'];
+                if ($stackPtr > $start && $stackPtr < $end) {
+                    // element is warped by try no check required
+                    return;
+                }
+            }
+
+            $phpcsFile->addWarning(
+                $this->warningMessage,
+                $stackPtr,
+                $this->warningCode
+            );
+        }
+    }
+}

Magento2/Tests/Exceptions/TryProcessSystemResourcesUnitTest.inc

@@ -0,0 +1,29 @@
+<?php
+
+namespace Foo\Bar;
+
+use Exception;
+
+class StreamHandler
+{
+    public function handleException()
+    {
+        try {
+            $strChar = stream_get_contents(STDIN, 1);
+        } catch (Exception $exception) {
+
+        }
+    }
+}
+
+function executeStream()
+{
+    // Rule find: Try block detected when processing system resources
+    $strChar = stream_get_contents(STDIN, 1);
+    // Rule find: Try block detected when processing system resources
+    $sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
+    // Rule find: Try block detected when processing system resources
+    socket_bind($sock);
+    // Rule find: Try block detected when processing system resources
+    socket_close($sock);
+}

Magento2/Tests/Exceptions/TryProcessSystemResourcesUnitTest.php

@@ -0,0 +1,35 @@
+<?php
+/**
+ * Copyright © Magento. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento2\Tests\Exceptions;
+
+use PHP_CodeSniffer\Tests\Standards\AbstractSniffUnitTest;
+
+/**
+ * Class ThrowCatchUnitTest
+ */
+class TryProcessSystemResourcesUnitTest extends AbstractSniffUnitTest
+{
+    /**
+     * @inheritdoc
+     */
+    protected function getErrorList()
+    {
+        return [];
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function getWarningList()
+    {
+        return [
+            22 => 1,
+            24 => 1,
+            26 => 1,
+            28 => 1
+        ];
+    }
+}

Magento2/ruleset.xml

@@ -153,6 +153,14 @@
         <severity>8</severity>
         <type>warning</type>
     </rule>
+    <rule ref="Magento2.Exceptions.TryProcessSystemResources">
+        <severity>8</severity>
+        <type>warning</type>
+        <exclude-pattern>*/_files/*</exclude-pattern>
+        <exclude-pattern>*/Fixtures/*</exclude-pattern>
+        <exclude-pattern>*/Test/*</exclude-pattern>
+        <exclude-pattern>*Test.php</exclude-pattern>
+    </rule>
     <rule ref="Magento2.Functions.DiscouragedFunction">
         <severity>8</severity>
         <type>warning</type>