Tail admin logs to always display data

lizmap/modules/admin/controllers/logs.classic.php

@@ -46,18 +46,7 @@ public function index()
         $detailNumber = $dao->countBy($conditions);
 
         // Get last error log
-        $logPath = jApp::logPath('lizmap-admin.log');
-        $errorLog = '';
-        $lines = 50;
-        if (is_file($logPath)) {
-            // Only display content if the file is small to avoid memory issues
-            if (filesize($logPath) > 512000) {
-                $errorLog = 'toobig';
-            } else {
-                $errorLog = trim(implode('', array_slice(file($logPath), -$lines)));
-                $errorLog = htmlentities($errorLog);
-            }
-        }
+        $errorLog = \Lizmap\App\FileTools::tail(jApp::logPath('lizmap-admin.log'), 50);
 
         // Display content via templates
         $tpl = new jTpl();

lizmap/modules/lizmap/lib/App/FileTools.php

@@ -0,0 +1,79 @@
+<?php
+/**
+ * File tools for Lizmap.
+ *
+ * @author    3liz
+ * @copyright 2024 3liz
+ *
+ * @see      https://3liz.com
+ *
+ * @license Mozilla Public License : http://www.mozilla.org/MPL/
+ */
+
+namespace Lizmap\App;
+
+class FileTools
+{
+    /**
+     * Tail in PHP, capable of eating big files.
+     *
+     * @author  Torleif Berger
+     *
+     * @see    http://www.geekality.net/?p=1654
+     *
+     * @return string
+     */
+    public static function tail(string $filepath, int $lines = 10, int $buffer = 4096)
+    {
+        // Check if the file path exists and is a file
+        if (!file_exists($filepath) || !is_file($filepath)) {
+            return '';
+        }
+
+        // Open the file
+        $f = fopen($filepath, 'rb');
+        // Jump to last character
+        fseek($f, -1, SEEK_END);
+
+        // Prepare to collect output
+        $output = '';
+        $chunk = '';
+
+        // Start reading it and adjust line number if necessary
+        // (Otherwise the result would be wrong if file doesn't end with a blank line)
+        $TAIL_NL = "\n";
+        if (fread($f, 1) != $TAIL_NL) {
+            --$lines;
+        }
+
+        // While we would like more
+        while (ftell($f) > 0 && $lines >= 0) {
+            // Figure out how far back we should jump
+            $seek = min(ftell($f), $buffer);
+
+            // Do the jump (backwards, relative to where we are)
+            fseek($f, -$seek, SEEK_CUR);
+
+            // Read a chunk and prepend it to our output
+            $output = ($chunk = fread($f, $seek)).$output;
+
+            // Jump back to where we started reading
+            fseek($f, -mb_strlen($chunk, '8bit'), SEEK_CUR);
+
+            // Decrease our line counter
+            $lines -= substr_count($chunk, $TAIL_NL);
+        }
+
+        // While we have too many lines
+        // (Because of buffer size we might have read too many)
+        while ($lines++ < 0) {
+            // Find first newline and remove all text before that
+            $output = substr($output, strpos($output, $TAIL_NL) + 1);
+        }
+
+        // Close file and return
+        fclose($f);
+
+        return $output;
+    }
+}

lizmap/modules/lizmap/lib/Request/Proxy.php

@@ -1016,7 +1016,7 @@ public static function getEchoFromRequest(string $url, string $body): string
         $logPath = \jApp::logPath('echoproxy.log');
         if (is_file($logPath)) {
             // retrieve the 50 last lines
-            $nLastLines = preg_split("/\r\n|\n|\r/", self::tail($logPath, 50));
+            $nLastLines = preg_split("/\r\n|\n|\r/", App\FileTools::tail($logPath, 50));
             // key : md5 , value : usefull content
             $md5Assoc = array();
             foreach ($nLastLines as $line) {
@@ -1032,62 +1032,6 @@ public static function getEchoFromRequest(string $url, string $body): string
 
         return 'unfound echoproxy.log';
     }
-
-    /**
-     * Tail in PHP, capable of eating big files.
-     *
-     * @author  Torleif Berger
-     *
-     * @see    http://www.geekality.net/?p=1654
-     */
-    protected static function tail(string $filepath, int $lines = 10, int $buffer = 4096)
-    {
-        // Open the file
-        $f = fopen($filepath, 'rb');
-        // Jump to last character
-        fseek($f, -1, SEEK_END);
-
-        // Prepare to collect output
-        $output = '';
-        $chunk = '';
-
-        // Start reading it and adjust line number if necessary
-        // (Otherwise the result would be wrong if file doesn't end with a blank line)
-        $TAIL_NL = "\n";
-        if (fread($f, 1) != $TAIL_NL) {
-            --$lines;
-        }
-
-        // While we would like more
-        while (ftell($f) > 0 && $lines >= 0) {
-            // Figure out how far back we should jump
-            $seek = min(ftell($f), $buffer);
-
-            // Do the jump (backwards, relative to where we are)
-            fseek($f, -$seek, SEEK_CUR);
-
-            // Read a chunk and prepend it to our output
-            $output = ($chunk = fread($f, $seek)).$output;
-
-            // Jump back to where we started reading
-            fseek($f, -mb_strlen($chunk, '8bit'), SEEK_CUR);
-
-            // Decrease our line counter
-            $lines -= substr_count($chunk, $TAIL_NL);
-        }
-
-        // While we have too many lines
-        // (Because of buffer size we might have read too many)
-        while ($lines++ < 0) {
-            // Find first newline and remove all text before that
-            $output = substr($output, strpos($output, $TAIL_NL) + 1);
-        }
-
-        // Close file and return
-        fclose($f);
-
-        return $output;
-    }
 }
 
 /*

tests/units/classes/App/FileToolsTest.php

@@ -0,0 +1,31 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+use Lizmap\App\FileTools;
+
+class FileToolsTest extends TestCase
+{
+    function testTail() {
+        $TAIL_NL = "\n";
+
+        $oneLinePath = __DIR__.'/Ressources/one-line.txt';
+        $this->assertEquals('1 line', trim(FileTools::tail($oneLinePath, 1)));
+        $this->assertEquals('1 line', trim(FileTools::tail($oneLinePath, 5)));
+
+        $tenLinePath = __DIR__.'/Ressources/ten-lines.txt';
+        $this->assertEquals('10 lines', trim(FileTools::tail($tenLinePath, 1)));
+
+        $lines = explode($TAIL_NL, trim(FileTools::tail($tenLinePath, 5)));
+        $this->assertCount(5, $lines);
+        $this->assertEquals('10 lines', $lines[4]);
+        $this->assertEquals('6 lines', $lines[0]);
+
+        $dirPath = __DIR__.'/Ressources';
+        $this->assertEquals('', trim(FileTools::tail($dirPath, 1)));
+        $this->assertEquals('', trim(FileTools::tail($dirPath, 5)));
+
+        $unknownPath = __DIR__.'/Ressources/unknown.txt';
+        $this->assertEquals('', trim(FileTools::tail($unknownPath, 1)));
+        $this->assertEquals('', trim(FileTools::tail($unknownPath, 5)));
+    }
+}

tests/units/classes/App/Ressources/one-line.txt

@@ -0,0 +1 @@
+1 line

tests/units/classes/App/Ressources/ten-lines.txt

@@ -0,0 +1,10 @@
+1 line
+2 lines
+3 lines
+4 lines
+5 lines
+6 lines
+7 lines
+8 lines
+9 lines
+10 lines