Add stream writer

refs #5683

library/Icinga/Logger/Writer/StreamWriter.php

@@ -0,0 +1,97 @@
+<?php
+// {{{ICINGA_LICENSE_HEADER}}}
+// {{{ICINGA_LICENSE_HEADER}}}
+
+namespace Icinga\Logger\Writer;
+
+use \Zend_Config;
+use Icinga\Logger\Logger;
+use Icinga\Logger\LogWriter;
+use Icinga\Application\Config;
+use Icinga\Exception\ConfigurationError;
+
+/**
+ * Class to write log messages to a stream
+ */
+class StreamWriter extends LogWriter
+{
+    /**
+     * The path to the stream
+     *
+     * @var string
+     */
+    protected $stream;
+
+    /**
+     * Create a new log writer initialized with the given configuration
+     */
+    public function __construct(Zend_Config $config)
+    {
+        $this->stream = Config::resolvePath($config->target);
+        $this->setup();
+    }
+
+    /**
+     * Log a message with the given severity
+     *
+     * @param   int     $severity   The severity to use
+     * @param   string  $message    The message to log
+     */
+    public function log($severity, $message)
+    {
+        $this->write(date('c') . ' ' . $this->getSeverityString($severity) . ' ' . $message);
+    }
+
+    /**
+     * Create the stream if it does not already exist
+     */
+    protected function setup()
+    {
+        if (substr($this->stream, 0, 6) !== 'php://') {
+            if (!file_exists($this->stream) && (!@touch($this->stream) || !@chmod($this->stream, 0664))) {
+                throw new ConfigurationError('Cannot create log file "' . $this->stream . '"');
+            }
+
+            if (!@is_writable($this->stream)) {
+                throw new ConfigurationError('Cannot write to log file "' . $this->stream . '"');
+            }
+        }
+    }
+
+    /**
+     * Return a string representation for the given severity
+     *
+     * @param   string      $severity   The severity to use
+     *
+     * @return  string                  The string representation of the severity
+     *
+     * @throws  Exception               In case the given severity is unknown
+     */
+    protected function getSeverityString($severity)
+    {
+        switch ($severity) {
+            case Logger::$ERROR:
+                return '- ERROR -';
+            case Logger::$WARNING:
+                return '- WARNING -';
+            case Logger::$INFO:
+                return '- INFO -';
+            case Logger::$DEBUG:
+                return '- DEBUG -';
+            default:
+                throw new Exception('Unknown severity "' . $severity . '"');
+        }
+    }
+
+    /**
+     * Write a message to the stream
+     *
+     * @param   string  $text   The message to write
+     */
+    protected function write($text)
+    {
+        $fd = fopen($this->stream, 'a');
+        fwrite($fd, $text . PHP_EOL);
+        fclose($fd);
+    }
+}

test/php/library/Icinga/Application/LoggerTest.php

@@ -35,6 +35,8 @@ use Icinga\Test\BaseTestCase;
 
 // @codingStandardsIgnoreStart
 require_once BaseTestCase::$libDir . '/Logger/Logger.php';
+require_once BaseTestCase::$libDir . '/Logger/LogWriter.php';
+require_once BaseTestCase::$libDir . '/Logger/Writer/StreamWriter.php';
 // @codingStandardsIgnoreEnd
 
 use \Zend_Config;