fix a bug with new logs sometimes overriding index of older logs

src/LogFile.php

@@ -58,6 +58,8 @@ public function logs(): LogReader
 
     public function size(): int
     {
+        clearstatcache();
+
         return filesize($this->path);
     }
 

src/LogReader.php

@@ -364,6 +364,7 @@ public function scan(int $maxBytesToScan = null, bool $force = false): self
         if ($currentLog !== '' && preg_match($logMatchPattern, $currentLog) === 1) {
             if ((is_null($this->query) || preg_match($this->query, $currentLog))) {
                 $logIndex->addToIndex($currentLogPosition, $currentTimestamp, $currentLogLevel, $currentIndex);
+                $currentIndex++;
             }
         }
 

tests/Pest.php

@@ -1,5 +1,6 @@
 <?php
 
+use Carbon\Carbon;
 use Illuminate\Support\Facades\File;
 use Opcodes\LogViewer\LogFile;
 use Opcodes\LogViewer\LogIndex;
@@ -18,30 +19,60 @@
 
 /**
  * Generate log files with random data
- *
- * @param  array <int, string>  $files
- * @return void
  */
-function generateLogFiles(array $files): void
+function generateLogFiles(array $files, string $content = null, bool $randomContent = false): array
 {
-    foreach ($files as $file) {
-        $file = storage_path('logs/'.$file);
+    return array_map(
+        fn ($file) => generateLogFile($file, $content, $randomContent),
+        $files
+    );
+}
 
-        if (File::exists($file)) {
-            File::delete($file);
-        }
+function generateLogFile(string $fileName = null, string $content = null, bool $randomContent = false): LogFile
+{
+    if (is_null($fileName)) {
+        $fileName = \Illuminate\Support\Str::random().'.log';
+    }
 
-        File::put($file, str()->random());
+    $path = storage_path('logs/'.$fileName);
 
-        test()->assertFileExists($file);
+    if (File::exists($path)) {
+        File::delete($path);
     }
+
+    File::put($path, $content ?? ($randomContent ? dummyLogData() : ''));
+
+    // we perform a regular PHP assertion, so it doesn't count towards the unit test assertion count.
+    assert(file_exists($path));
+
+    return new LogFile($fileName, $path);
+}
+
+function dummyLogData(int $lines = null): string
+{
+    if (is_null($lines)) {
+        $lines = rand(1, 10);
+    }
+
+    return implode("\n", array_map(
+        fn ($_) => makeLogEntry(),
+        range(1, $lines)
+    ));
 }
 
 function clearGeneratedLogFiles(): void
 {
     File::cleanDirectory(storage_path('logs'));
 }
 
+function makeLogEntry(Carbon $date = null, string $level = 'debug', string $message = 'Testing log entry'): string
+{
+    $dateFormatted = $date instanceof Carbon ? $date->toDateTimeString() : now()->toDateTimeString();
+    $level = strtoupper($level);
+
+    return "[$dateFormatted] local.$level: $message";
+}
+
 function createLogIndex($file = null, $query = null, array $predefinedLogs = []): LogIndex
 {
     if (is_null($file)) {

tests/Unit/LogReaderTest.php

@@ -0,0 +1,41 @@
+<?php
+
+use Illuminate\Support\Facades\File;
+use Opcodes\LogViewer\LogFile;
+
+beforeEach(function () {
+    $this->file = generateLogFile();
+    File::append($this->file->path, makeLogEntry());
+});
+
+afterEach(fn () => clearGeneratedLogFiles());
+
+it('can scan a log file', function () {
+    $logReader = $this->file->logs();
+    expect($logReader->requiresScan())->toBeTrue();
+
+    $logReader->scan();
+
+    expect($logReader->requiresScan())->toBeFalse()
+        ->and($logReader->index()->total())->toBe(1);
+});
+
+it('can re-scan the file after a new entry has been added', function () {
+    $logReader = $this->file->logs();
+    $logReader->scan();
+
+    \Spatie\TestTime\TestTime::addMinute();
+
+    File::append($this->file->path, PHP_EOL.makeLogEntry());
+
+    // re-instantiate the log reader to make sure we don't have anything cached
+    $this->file = new LogFile($this->file->name, $this->file->path);
+    $logReader = $this->file->logs();
+    expect($logReader->requiresScan())->toBeTrue();
+
+    $logReader->scan();
+
+    expect($logReader->requiresScan())->toBeFalse()
+        ->and($logReader->index()->total())->toBe(2)
+        ->and($logReader->index()->getFlatIndex())->toHaveCount(2);
+});