bug #47878 [HttpKernel] Remove EOL when using error_log() in HttpKernel Logger (cyve)

This PR was squashed before being merged into the 4.4 branch.

Discussion
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[HttpKernel] Remove EOL when using error_log() in HttpKernel Logger

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | maybe
| Tickets       |
| License       | MIT
| Doc PR        |

Hello there !

Since PR symfony/symfony#36855, when using `Symfony\Component\HttpKernel\Log\Logger`  with argument `$output = null`. The logger use the `error_log()` method to log messages. But in the log file, messages are separated by an empty line because the default formatter (`Logger::format()`) adds an extra EOL char at the end of the message.

This fix prevents the logger to add an extra EOL char when it uses `error_log()`.

Possible BC : if someone use the logger with a custom formatter that already add a EOL char at the end of the message, there will be a empty line between messages in the log file. In my opinion, this is minor enough not to worry about it ;-)

Thanks for your review :-)

Commits
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69cf83ea1a [HttpKernel] Remove EOL when using error_log() in HttpKernel Logger

Author: nicolas-grekas

Log/Logger.php

@@ -44,10 +44,14 @@ public function __construct(string $minLevel = null, $output = null, callable $f
 
             if (isset($_ENV['SHELL_VERBOSITY']) || isset($_SERVER['SHELL_VERBOSITY'])) {
                 switch ((int) ($_ENV['SHELL_VERBOSITY'] ?? $_SERVER['SHELL_VERBOSITY'])) {
-                    case -1: $minLevel = LogLevel::ERROR; break;
-                    case 1: $minLevel = LogLevel::NOTICE; break;
-                    case 2: $minLevel = LogLevel::INFO; break;
-                    case 3: $minLevel = LogLevel::DEBUG; break;
+                    case -1: $minLevel = LogLevel::ERROR;
+                        break;
+                    case 1: $minLevel = LogLevel::NOTICE;
+                        break;
+                    case 2: $minLevel = LogLevel::INFO;
+                        break;
+                    case 3: $minLevel = LogLevel::DEBUG;
+                        break;
                 }
             }
         }
@@ -80,7 +84,7 @@ public function log($level, $message, array $context = [])
 
         $formatter = $this->formatter;
         if ($this->handle) {
-            @fwrite($this->handle, $formatter($level, $message, $context));
+            @fwrite($this->handle, $formatter($level, $message, $context).\PHP_EOL);
         } else {
             error_log($formatter($level, $message, $context, false));
         }
@@ -105,7 +109,7 @@ private function format(string $level, string $message, array $context, bool $pr
             $message = strtr($message, $replacements);
         }
 
-        $log = sprintf('[%s] %s', $level, $message).\PHP_EOL;
+        $log = sprintf('[%s] %s', $level, $message);
         if ($prefixDate) {
             $log = date(\DateTime::RFC3339).' '.$log;
         }

Tests/Log/LoggerTest.php

@@ -48,7 +48,7 @@ protected function tearDown(): void
     public static function assertLogsMatch(array $expected, array $given)
     {
         foreach ($given as $k => $line) {
-            self::assertThat(1 === preg_match('/[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}[\+-][0-9]{2}:[0-9]{2} '.preg_quote($expected[$k]).'/', $line), self::isTrue(), "\"$line\" do not match expected pattern \"$expected[$k]\"");
+            self::assertSame(1, preg_match('/[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}[\+-][0-9]{2}:[0-9]{2} '.preg_quote($expected[$k]).'/', $line), "\"$line\" do not match expected pattern \"$expected[$k]\"");
         }
     }
 
@@ -186,7 +186,7 @@ public function testContextExceptionKeyCanBeExceptionOrOtherValues()
     public function testFormatter()
     {
         $this->logger = new Logger(LogLevel::DEBUG, $this->tmpFile, function ($level, $message, $context) {
-            return json_encode(['level' => $level, 'message' => $message, 'context' => $context]).\PHP_EOL;
+            return json_encode(['level' => $level, 'message' => $message, 'context' => $context]);
         });
 
         $this->logger->error('An error', ['foo' => 'bar']);
@@ -196,6 +196,26 @@ public function testFormatter()
             '{"level":"warning","message":"A warning","context":{"baz":"bar"}}',
         ], $this->getLogs());
     }
+
+    public function testLogsWithoutOutput()
+    {
+        $oldErrorLog = ini_set('error_log', $this->tmpFile);
+
+        $logger = new Logger();
+        $logger->error('test');
+        $logger->critical('test');
+
+        $expected = [
+            '[error] test',
+            '[critical] test',
+        ];
+
+        foreach ($this->getLogs() as $k => $line) {
+            $this->assertSame(1, preg_match('/\[[\w\/\-: ]+\] '.preg_quote($expected[$k]).'/', $line), "\"$line\" do not match expected pattern \"$expected[$k]\"");
+        }
+
+        ini_set('error_log', $oldErrorLog);
+    }
 }
 
 class DummyTest