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tesseract/tesseract.php aktualisiert

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Modified addon.
The addon used to generate a large system load and led to the server being unavailable. The changes help to make better use of system resources.

- Creates and removes tesseract-limited.sh to limit the system resources for tesseract (timeout/resource limits).
- Checks permitted formats to avoid wasting resources.
This commit is contained in:
loma-one 2025-05-03 13:26:23 +02:00
parent f0999a1e46
commit 37285a2019
1 changed files with 85 additions and 6 deletions
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87
tesseract/tesseract.php
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@ -1,9 +1,10 @@
<?php
/**
* Name: Tesseract OCR
* Description: Use OCR to get text from images
* Version: 0.1
* Description: Use OCR to get text from images (with timeout, resource limits, format check)
* Version: 0.2
* Author: Michael Vogel <http://pirati.ca/profile/heluecht>
* Modified by: Matthias Ebers <http://loma.ml/profile/feb>
*/
use Friendica\Core\Hook;
@ -13,24 +14,102 @@ use thiagoalessio\TesseractOCR\TesseractOCR;
require_once __DIR__ . DIRECTORY_SEPARATOR . 'vendor' . DIRECTORY_SEPARATOR . 'autoload.php';
/**
* Is called up when the add-on is activated
*/
function tesseract_install()
{
Hook::register('ocr-detection', __FILE__, 'tesseract_ocr_detection');
Logger::notice('installed tesseract');
$wrapperPath = __DIR__ . '/tesseract-limited.sh';
// Create wrapper script with timeout and CPU/I/O priority
if (!file_exists($wrapperPath)) {
$script = <<<BASH
#!/bin/bash
# Wrapper for tesseract with timeout and resource limits
timeout 5s nice -n 10 ionice -c3 /usr/bin/tesseract "\$@"
BASH;
file_put_contents($wrapperPath, $script);
chmod($wrapperPath, 0755);
Logger::notice('Tesseract wrapper script created', ['path' => $wrapperPath]);
} else {
Logger::info('Tesseract wrapper script already exists', ['path' => $wrapperPath]);
}
Logger::notice('Tesseract OCR addon installed');
}
/**
* Is called up when the add-on is deactivated
*/
function tesseract_uninstall()
{
$wrapperPath = __DIR__ . '/tesseract-limited.sh';
if (file_exists($wrapperPath)) {
unlink($wrapperPath);
Logger::notice('Tesseract wrapper script removed', ['path' => $wrapperPath]);
}
Hook::unregister('ocr-detection', __FILE__, 'tesseract_ocr_detection');
Logger::notice('Tesseract OCR addon uninstalled');
}
/**
* Main function for OCR recognition
*/
function tesseract_ocr_detection(&$media)
{
// ➤ Alt text available? → Skip OCR
if (!empty($media['description'])) {
Logger::debug('Image already has description, skipping OCR');
return;
}
// Format check: Only process certain image types
$allowedTypes = ['image/jpeg', 'image/png', 'image/bmp', 'image/tiff'];
if (!empty($media['type']) && !in_array($media['type'], $allowedTypes)) {
Logger::debug('Unsupported image type for OCR', ['type' => $media['type']]);
return;
}
// Alternatively: Check file extension (if MIME type is missing)
if (empty($media['type']) && !empty($media['filename']) && preg_match('/\.gif$/i', $media['filename'])) {
Logger::debug('GIF image detected via filename, skipping OCR');
return;
}
$ocr = new TesseractOCR();
try {
// Bash wrapper with resource limit
$wrapperPath = __DIR__ . '/tesseract-limited.sh';
$ocr->executable($wrapperPath);
// Load all available languages
$languages = $ocr->availableLanguages();
if ($languages) {
$ocr->lang(implode('+', $languages));
}
// Set temporary directory
$ocr->tempDir(System::getTempPath());
// Set image data
$ocr->imageData($media['img_str'], strlen($media['img_str']));
$media['description'] = $ocr->run();
// Start OCR
$text = trim($ocr->run());
if (!empty($text)) {
$media['description'] = $text;
Logger::debug('OCR text detected', ['text' => $text]);
} else {
Logger::debug('No text detected in image');
}
} catch (\Throwable $th) {
Logger::info('Error calling TesseractOCR', ['message' => $th->getMessage()]);
}