Merge pull request #41 from localheinz/feature/example

Enhancement: Add example for tailing a log file

Author: WyriHaximus

examples/tail.php

@@ -0,0 +1,40 @@
+<?php
+
+require dirname(__DIR__) . '/vendor/autoload.php';
+
+$loop = \React\EventLoop\Factory::create();
+
+$filesystem = \React\Filesystem\Filesystem::create($loop);
+
+$path = '/var/log/access.log';
+
+$filesystem->getContents($path)->then(function ($content) use ($loop, $filesystem, $path) {
+    echo $content;
+
+    $lastSize = strlen($content);
+
+    $file = $filesystem->file($path);
+
+    $file->open('r')->then(function (\React\Stream\ReadableStreamInterface $stream) use ($filesystem, $loop, $file, &$lastSize) {
+        /** @var \React\Filesystem\Stream\GenericStreamInterface $stream */
+        $fileDescriptor = $stream->getFiledescriptor();
+
+        $adapter = $filesystem->getAdapter();
+
+        $loop->addPeriodicTimer(1, function () use ($adapter, $fileDescriptor, $file, &$lastSize) {
+            $file->size()->then(function ($size) use ($adapter, $fileDescriptor, &$lastSize) {
+                if ($lastSize === $size) {
+                    return;
+                }
+
+                $adapter->read($fileDescriptor, $size - $lastSize, $lastSize)->then(function ($content) {
+                    echo $content;
+                });
+
+                $lastSize = $size;
+            });
+        });
+    });
+});
+
+$loop->run();