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<?php declare(strict_types=1); |
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namespace Lisachenko\Protocol\FCGI; |
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use Lisachenko\Protocol\FCGI; |
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/** |
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* Utility class to simplify parsing of FCGI protocol data. |
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* |
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* @author Alexander.Lisachenko |
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*/ |
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class FrameParser |
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{ |
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/** |
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* Mapping of constants to the classes |
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* |
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* @var array |
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*/ |
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protected static $classMapping = [ |
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FCGI::BEGIN_REQUEST => FCGI\Record\BeginRequest::class, |
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FCGI::ABORT_REQUEST => FCGI\Record\AbortRequest::class, |
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FCGI::END_REQUEST => FCGI\Record\EndRequest::class, |
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FCGI::PARAMS => FCGI\Record\Params::class, |
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FCGI::STDIN => FCGI\Record\Stdin::class, |
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FCGI::STDOUT => FCGI\Record\Stdout::class, |
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FCGI::STDERR => FCGI\Record\Stderr::class, |
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FCGI::DATA => FCGI\Record\Data::class, |
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FCGI::GET_VALUES => FCGI\Record\GetValues::class, |
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FCGI::GET_VALUES_RESULT => FCGI\Record\GetValuesResult::class, |
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FCGI::UNKNOWN_TYPE => FCGI\Record\UnknownType::class, |
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]; |
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/** |
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* Checks if the buffer contains a valid frame to parse |
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* |
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* @param string $buffer Binary buffer |
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* |
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* @return bool |
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*/ |
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public static function hasFrame(string $buffer): bool |
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{ |
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$bufferLength = strlen($buffer); |
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1 |
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if ($bufferLength < FCGI::HEADER_LEN) { |
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return false; |
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} |
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$fastInfo = unpack(FCGI::HEADER_FORMAT, $buffer); |
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if ($bufferLength < FCGI::HEADER_LEN + $fastInfo['contentLength'] + $fastInfo['paddingLength']) { |
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return false; |
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} |
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return true; |
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1 |
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} |
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/** |
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* Parses a frame from the binary buffer |
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* |
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* @param string $buffer Binary buffer |
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* |
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* @return Record One of the corresponding FCGI record |
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*/ |
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public static function parseFrame(string &$buffer): Record |
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{ |
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$bufferLength = strlen($buffer); |
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if ($bufferLength < FCGI::HEADER_LEN) { |
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throw new \RuntimeException("Not enough data in the buffer to parse"); |
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} |
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$recordHeader = unpack(FCGI::HEADER_FORMAT, $buffer); |
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$recordType = $recordHeader['type']; |
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if (!isset(self::$classMapping[$recordType])) { |
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throw new \DomainException("Invalid FCGI record type {$recordType} received"); |
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} |
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/** @var Record $className */ |
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$className = self::$classMapping[$recordType]; |
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$record = $className::unpack($buffer); |
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$offset = FCGI::HEADER_LEN + $record->getContentLength() + $record->getPaddingLength(); |
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$buffer = substr($buffer, $offset); |
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return $record; |
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} |
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} |
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lisachenko /
protocol-fcgi
