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Implement backend. That went better than expected!

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We should test it thoroughly to make sure it functions as expected.
This commit is contained in:
Starbeamrainbowlabs 2019-10-21 00:31:18 +01:00
parent da785a05b9
commit b7cb9741de
Signed by: sbrl
GPG key ID: 1BE5172E637709C2
2 changed files with 93 additions and 4 deletions
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2
module_index.json
View file

@ -337,7 +337,7 @@
"version": "0.10",
"author": "Emanuil Rusev & Starbeamrainbowlabs",
"description": "An upgraded (now default!) parser based on Emanuil Rusev's Parsedown Extra PHP library (https:\/\/github.com\/erusev\/parsedown-extra), which is licensed MIT. Please be careful, as this module adds some weight to your installation.",
"lastupdate": 1571605152,
"lastupdate": 1571614194,
"optional": false,
"extra_data": {
"Parsedown.php": "https:\/\/raw.githubusercontent.com\/erusev\/parsedown\/fe7a50eceb4a3c867cc9fa9c0aa906b1067d1955\/Parsedown.php",

93
modules/parser-parsedown.php
View file

@ -90,8 +90,82 @@ register_module([
exit();
}
$renderer = $settings->parser_ext_renderers->$language;
$cache_id = hash("sha256",
hash("sha256", $language) .
hash("sha256", $source) .
($_GET["immutable_key"] ?? "")
);
$cache_file_location = "{$paths->cache_directory}/render_ext/$cache_id." . system_mime_type_extension($renderer->output_format);
// If it exists on disk already, then serve that instead
if(file_exists($cache_file_location)) {
header("cache-control: public, max-age=31536000, immutable");
header("content-type: $renderer->output_format");
header("content-length: " . filesize($cache_file_location));
header("x-cache: render_ext/hit");
readfile($cache_file_location);
exit();
}
$source_handle = tmpfile();
fwrite($source_handle, $source);
fseek($source_handle, 0);
// Create the cache directory if doesn't exist already
if(!file_exists(dirname($cache_file_location)))
mkdir(dirname($cache_file_location), 0750, true);
$dest_handle = fopen($cache_file_location, "wb+");
$error_text_handle = tmpfile();
$start_time = microtime(true);
$process_handle = proc_open(
$renderer->cli,
[
0 => $source_handle,
1 => $dest_handle,
2 => $error_text_handle
],
$pipes,
null, // working directory
null // environment variables
);
if(!is_resource($process_handle)) {
http_response_code(503);
header("cache-control: no-cache, no-store, must-revalidate");
header("content-type: image/png");
imagepng(errorimage("Not implemented yet.\nComing soon :-)"));
imagepng(errorimage("Error: Failed to start external renderer.\nIs $renderer->name installed?"));
exit();
}
// Wait for it to exit
$exit_code = proc_close($process_handle);
fclose($dest_handle);
fclose($source_handle);
$time_taken = round((microtime(true) - $start_time) * 1000, 2);
if($exit_code !== 0) {
fseek($error_text_handle, 0);
$error_details = stream_get_contents($error_text_handle);
http_response_code(503);
header("content-type: image/png");
imagepng(errorimage(
"Error: The external renderer ($renderer->name)\nexited with code $exit_code.\nDetails:\n" . wordwrap($error_details)
));
exit();
}
header("cache-control: public, max-age=31536000, immutable");
header("content-type: $renderer->output_format");
header("content-length: " . filesize($cache_file_location));
header("x-cache: render_ext/miss, renderer took {$time_taken}ms");
readfile($cache_file_location);
});
/*
@ -840,6 +914,21 @@ class PeppermintParsedown extends ParsedownExtreme
}
}
/*
* ██████ ██████ ██████ ███████ ██████ ██ ██████ ██████ ██ ██
* ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
* ██ ██ ██ ██ ██ █████ ██████ ██ ██ ██ ██ █████
* ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
* ██████ ██████ ██████ ███████ ██████ ███████ ██████ ██████ ██ ██
*
* ██ ██ ██████ ██████ ██████ █████ ██████ ███████
* ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
* ██ ██ ██████ ██ ███ ██████ ███████ ██ ██ █████
* ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
* ██████ ██ ██████ ██ ██ ██ ██ ██████ ███████
*/
protected function blockFencedCodeComplete($block) {
global $settings;
$result = parent::blockFencedCodeComplete($block);
@ -856,7 +945,7 @@ class PeppermintParsedown extends ParsedownExtreme
"name" => "img",
"attributes" => [
"alt" => "Diagram rendered by {$renderer->name}",
"src" => "?action=parsedown-render-ext&language=$language&source=".rawurlencode($text)
"src" => "?action=parsedown-render-ext&language=$language&immutable_key=".hash("crc32b", json_encode($renderer))."&source=".rawurlencode($text)
]
];