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Add timeout to exif reads (#34)

pull/62/head
Varun Patil 2022-09-14 18:14:06 -07:00
parent 463e57d98b
commit d66ca0a281
1 changed files with 72 additions and 28 deletions
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90
lib/Exif.php
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@ -21,6 +21,7 @@ class Exif {
1 => array('pipe', 'w'),
2 => array('pipe', 'w'),
], self::$staticPipes);
stream_set_blocking(self::$staticPipes[1], false);
}
public static function closeStaticExiftoolProc() {
@ -30,10 +31,17 @@ class Exif {
fclose(self::$staticPipes[1]);
fclose(self::$staticPipes[2]);
proc_terminate(self::$staticProc);
self::$staticProc = null;
self::$staticPipes = null;
}
} catch (\Exception $ex) {}
}
public static function restartStaticExiftoolProc() {
self::closeStaticExiftoolProc();
self::ensureStaticExiftoolProc();
}
public static function ensureStaticExiftoolProc() {
if (self::$noStaticProc) {
return;
@ -126,23 +134,49 @@ class Exif {
}
}
private static function getExifFromLocalPathWithStaticProc(string &$path) {
fwrite(self::$staticPipes[0], "$path\n-json\n-api\nQuickTimeUTC=1\n-execute\n");
fflush(self::$staticPipes[0]);
/**
* Read from non blocking handle or throw timeout
* @param resource $handle
* @param int $timeout milliseconds
* @param string $delimiter null for eof
*/
private static function readOrTimeout($handle, $timeout, $delimiter=null) {
$buf = '';
$waitedMs = 0;
$buf = "";
$readyToken = "\n{ready}\n";
while (!str_ends_with($buf, $readyToken)) {
$r = fread(self::$staticPipes[1], 1);
if ($r === false) {
error_log("PANIC: Something went wrong with static exiftool process");
exit(1);
while ($waitedMs < $timeout && ($delimiter ? !str_ends_with($buf, $delimiter) : !feof($handle))) {
$r = stream_get_contents($handle);
if (empty($r)) {
$waitedMs++;
usleep(1000);
continue;
}
$buf .= $r;
}
$buf = substr($buf, 0, strrpos($buf, $readyToken));
if ($waitedMs >= $timeout) {
throw new \Exception('Timeout');
}
return $buf;
}
private static function getExifFromLocalPathWithStaticProc(string &$path) {
fwrite(self::$staticPipes[0], "$path\n-json\n-api\nQuickTimeUTC=1\n-execute\n");
fflush(self::$staticPipes[0]);
$readyToken = "\n{ready}\n";
try {
$buf = self::readOrTimeout(self::$staticPipes[1], 2000, $readyToken);
$tokPos = strrpos($buf, $readyToken);
$buf = substr($buf, 0, $tokPos);
return self::processStdout($buf);
} catch (\Exception $ex) {
error_log("ERROR: Exiftool may have crashed, restarting process [$path]");
self::restartStaticExiftoolProc();
throw new \Exception("Nothing to read from Exiftool");
}
}
private static function getExifFromLocalPathWithSeparateProc(string &$path) {
@ -151,14 +185,19 @@ class Exif {
1 => array('pipe', 'w'),
2 => array('pipe', 'w'),
], $pipes);
$stdout = stream_get_contents($pipes[1]);
stream_set_blocking($pipes[1], false);
// Clean up
try {
$stdout = self::readOrTimeout($pipes[1], 5000);
return self::processStdout($stdout);
} catch (\Exception $ex) {
error_log("Exiftool timeout: [$path]");
throw new \Exception("Could not read from Exiftool");
} finally {
fclose($pipes[1]);
fclose($pipes[2]);
proc_close($proc);
return self::processStdout($stdout);
proc_terminate($proc);
}
}
/**
@ -176,18 +215,23 @@ class Exif {
// Write the file to exiftool's stdin
// Warning: this is slow for big files
stream_copy_to_stream($handle, $pipes[0]);
// Copy a maximum of 20MB; this may be $$$
stream_copy_to_stream($handle, $pipes[0], 20 * 1024 * 1024);
fclose($pipes[0]);
// Get output from exiftool
$stdout = stream_get_contents($pipes[1]);
// Clean up
stream_set_blocking($pipes[1], false);
try {
$stdout = self::readOrTimeout($pipes[1], 5000);
return self::processStdout($stdout);
} catch (\Exception $ex) {
error_log("Exiftool timeout for file stream: " . $ex->getMessage());
throw new \Exception("Could not read from Exiftool");
} finally {
fclose($pipes[1]);
fclose($pipes[2]);
proc_close($proc);
return self::processStdout($stdout);
proc_terminate($proc);
}
}
/** Get json array from stdout of exiftool */