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<?php |
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declare(strict_types=1); |
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namespace MySQLReplication\JsonBinaryDecoder; |
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use InvalidArgumentException; |
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use LengthException; |
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use MySQLReplication\BinaryDataReader\BinaryDataReader; |
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use MySQLReplication\BinaryDataReader\BinaryDataReaderException; |
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/** |
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* @see https://github.com/mysql/mysql-server/blob/5.7/sql/json_binary.cc |
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* @see https://github.com/mysql/mysql-server/blob/8.0/sql/json_binary.cc |
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* @see https://github.com/shyiko/mysql-binlog-connector-java/blob/master/src/main/java/com/github/shyiko/mysql/binlog/event/deserialization/json/JsonBinary.java |
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*/ |
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class JsonBinaryDecoderService |
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{ |
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public const SMALL_OBJECT = 0; |
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public const LARGE_OBJECT = 1; |
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public const SMALL_ARRAY = 2; |
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public const LARGE_ARRAY = 3; |
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public const LITERAL = 4; |
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public const INT16 = 5; |
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public const UINT16 = 6; |
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public const INT32 = 7; |
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public const UINT32 = 8; |
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public const INT64 = 9; |
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public const UINT64 = 10; |
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public const DOUBLE = 11; |
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public const STRING = 12; |
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//public const OPAQUE = 15; |
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public const LITERAL_NULL = 0; |
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public const LITERAL_TRUE = 1; |
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public const LITERAL_FALSE = 2; |
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public const SMALL_OFFSET_SIZE = 2; |
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public const LARGE_OFFSET_SIZE = 4; |
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public const KEY_ENTRY_SIZE_SMALL = 2 + self::SMALL_OFFSET_SIZE; |
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public const KEY_ENTRY_SIZE_LARGE = 2 + self::LARGE_OFFSET_SIZE; |
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public const VALUE_ENTRY_SIZE_SMALL = 1 + self::SMALL_OFFSET_SIZE; |
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public const VALUE_ENTRY_SIZE_LARGE = 1 + self::LARGE_OFFSET_SIZE; |
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public const OBJECT = 1; |
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public const ARRAY = 2; |
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public const SCALAR = 3; |
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private $binaryDataReader; |
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private $jsonBinaryDecoderFormatter; |
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private $dataLength; |
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public function __construct( |
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BinaryDataReader $binaryDataReader, |
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JsonBinaryDecoderFormatter $jsonBinaryDecoderFormatter |
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) { |
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$this->binaryDataReader = $binaryDataReader; |
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$this->jsonBinaryDecoderFormatter = $jsonBinaryDecoderFormatter; |
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$this->dataLength = $this->binaryDataReader->getBinaryDataLength(); |
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} |
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public static function makeJsonBinaryDecoder(string $data): self |
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{ |
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return new self( |
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new BinaryDataReader($data), |
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new JsonBinaryDecoderFormatter() |
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); |
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} |
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/** |
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* @throws BinaryDataReaderException |
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* @throws JsonBinaryDecoderException |
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*/ |
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public function parseToString(): string |
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{ |
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$this->parseJson($this->binaryDataReader->readUInt8()); |
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return $this->jsonBinaryDecoderFormatter->getJsonString(); |
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} |
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/** |
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* @throws JsonBinaryDecoderException |
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* @throws BinaryDataReaderException |
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*/ |
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private function parseJson(int $type): void |
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{ |
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if (self::SMALL_OBJECT === $type) { |
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$results[self::OBJECT] = $this->parseArrayOrObject(self::OBJECT, self::SMALL_OFFSET_SIZE); |
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} else if (self::LARGE_OBJECT === $type) { |
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$results[self::OBJECT] = $this->parseArrayOrObject(self::OBJECT, self::LARGE_OFFSET_SIZE); |
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} else if (self::SMALL_ARRAY === $type) { |
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$results[self::ARRAY] = $this->parseArrayOrObject(self::ARRAY, self::SMALL_OFFSET_SIZE); |
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} else if (self::LARGE_ARRAY === $type) { |
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$results[self::ARRAY] = $this->parseArrayOrObject(self::ARRAY, self::LARGE_OFFSET_SIZE); |
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} else { |
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$results[self::SCALAR][] = [ |
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'name' => null, |
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'value' => $this->parseScalar($type) |
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]; |
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} |
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$this->parseToJson($results); |
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} |
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/** |
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* @throws BinaryDataReaderException |
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* @throws JsonBinaryDecoderException |
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*/ |
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private function parseToJson(array $results): void |
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{ |
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foreach ($results as $dataType => $entities) { |
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if (self::OBJECT === $dataType) { |
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$this->jsonBinaryDecoderFormatter->formatBeginObject(); |
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} else if (self::ARRAY === $dataType) { |
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$this->jsonBinaryDecoderFormatter->formatBeginArray(); |
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} |
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foreach ($entities as $i => $entity) { |
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if ($dataType === self::SCALAR) { |
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if (null === $entity['value']->getValue()) { |
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$this->jsonBinaryDecoderFormatter->formatValue('null'); |
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} else if (is_bool($entity['value']->getValue())) { |
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$this->jsonBinaryDecoderFormatter->formatValueBool($entity['value']->getValue()); |
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} else { |
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$this->jsonBinaryDecoderFormatter->formatValue($entity['value']->getValue()); |
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} |
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continue; |
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} |
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if ($i !== 0) { |
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$this->jsonBinaryDecoderFormatter->formatNextEntry(); |
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} |
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if (null !== $entity['name']) { |
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$this->jsonBinaryDecoderFormatter->formatName($entity['name']); |
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} |
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$this->assignValues($entity['value']); |
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} |
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if (self::OBJECT === $dataType) { |
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$this->jsonBinaryDecoderFormatter->formatEndObject(); |
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} else if (self::ARRAY === $dataType) { |
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$this->jsonBinaryDecoderFormatter->formatEndArray(); |
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} |
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} |
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} |
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/** |
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* @throws BinaryDataReaderException |
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* @throws JsonBinaryDecoderException |
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*/ |
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private function parseArrayOrObject(int $type, int $intSize): array |
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{ |
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$large = $intSize === self::LARGE_OFFSET_SIZE; |
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$offsetSize = self::offsetSize($large); |
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if ($this->dataLength < 2 * $offsetSize) { |
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throw new InvalidArgumentException('Document is not long enough to contain the two length fields'); |
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} |
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$elementCount = $this->binaryDataReader->readUIntBySize($intSize); |
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$bytes = $this->binaryDataReader->readUIntBySize($intSize); |
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if ($bytes > $this->dataLength) { |
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throw new InvalidArgumentException( |
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'The value can\'t have more bytes than what\'s available in the data buffer.' |
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); |
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} |
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$keyEntrySize = self::keyEntrySize($large); |
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$valueEntrySize = self::valueEntrySize($large); |
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$headerSize = 2 * $offsetSize; |
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if ($type === self::OBJECT) { |
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$headerSize += $elementCount * $keyEntrySize; |
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} |
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$headerSize += $elementCount * $valueEntrySize; |
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if ($headerSize > $bytes) { |
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throw new InvalidArgumentException('Header is larger than the full size of the value.'); |
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} |
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$keyLengths = []; |
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if ($type === self::OBJECT) { |
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// Read each key-entry, consisting of the offset and length of each key ... |
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for ($i = 0; $i !== $elementCount; ++$i) { |
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$keyOffset = $this->binaryDataReader->readUIntBySize($intSize); |
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$keyLengths[$i] = $this->binaryDataReader->readUInt16(); |
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if ($keyOffset < $headerSize) { |
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throw new InvalidArgumentException('Invalid key offset'); |
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} |
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} |
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} |
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$entries = []; |
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for ($i = 0; $i !== $elementCount; ++$i) { |
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$entries[$i] = $this->getOffsetOrInLinedValue($bytes, $intSize); |
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} |
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$keys = []; |
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if ($type === self::OBJECT) { |
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for ($i = 0; $i !== $elementCount; ++$i) { |
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$keys[$i] = $this->binaryDataReader->read($keyLengths[$i]); |
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} |
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} |
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$results = []; |
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for ($i = 0; $i !== $elementCount; ++$i) { |
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$results[] = [ |
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'name' => $keys[$i] ?? null, |
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'value' => $entries[$i] |
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]; |
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} |
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return $results; |
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} |
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private static function offsetSize(bool $large): int |
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{ |
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return $large ? self::LARGE_OFFSET_SIZE : self::SMALL_OFFSET_SIZE; |
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} |
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private static function keyEntrySize(bool $large): int |
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{ |
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return $large ? self::KEY_ENTRY_SIZE_LARGE : self::KEY_ENTRY_SIZE_SMALL; |
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} |
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private static function valueEntrySize(bool $large): int |
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{ |
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return $large ? self::VALUE_ENTRY_SIZE_LARGE : self::VALUE_ENTRY_SIZE_SMALL; |
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} |
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/** |
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* @throws BinaryDataReaderException |
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* @throws JsonBinaryDecoderException |
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*/ |
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private function getOffsetOrInLinedValue(int $bytes, int $intSize): JsonBinaryDecoderValue |
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{ |
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$type = $this->binaryDataReader->readUInt8(); |
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if (self::isInLinedType($type, $intSize)) { |
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return $this->parseScalar($type); |
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} |
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$offset = $this->binaryDataReader->readUIntBySize($intSize); |
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if ($offset > $bytes) { |
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throw new LengthException( |
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'The offset for the value in the JSON binary document is ' . $offset . ', which is larger than the binary form of the JSON document (' . $bytes . ' bytes)' |
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); |
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} |
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return new JsonBinaryDecoderValue(false, null, $type, $offset); |
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} |
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private static function isInLinedType(int $type, int $intSize): bool |
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{ |
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switch ($type) { |
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case self::LITERAL: |
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case self::INT16: |
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case self::UINT16: |
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return true; |
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case self::INT32: |
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case self::UINT32: |
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return self::LARGE_OFFSET_SIZE === $intSize; |
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default: |
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return false; |
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} |
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} |
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/** |
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* @throws JsonBinaryDecoderException |
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*/ |
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private function parseScalar(int $type): JsonBinaryDecoderValue |
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{ |
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if (self::LITERAL === $type) { |
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$data = $this->readLiteral(); |
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} else if (self::INT16 === $type) { |
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$data = $this->binaryDataReader->readInt16(); |
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} else if (self::INT32 === $type) { |
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$data = ($this->binaryDataReader->readInt32()); |
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} else if (self::INT64 === $type) { |
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$data = $this->binaryDataReader->readInt64(); |
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} else if (self::UINT16 === $type) { |
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$data = ($this->binaryDataReader->readUInt16()); |
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} else if (self::UINT64 === $type) { |
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$data = ($this->binaryDataReader->readUInt64()); |
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} else if (self::DOUBLE === $type) { |
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$data = ($this->binaryDataReader->readDouble()); |
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} else if (self::STRING === $type) { |
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$data = ($this->binaryDataReader->read($this->readVariableInt())); |
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} /** |
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* else if (self::OPAQUE === $type) |
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* { |
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* |
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* } |
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*/ |
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else { |
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throw new JsonBinaryDecoderException( |
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JsonBinaryDecoderException::UNKNOWN_JSON_TYPE_MESSAGE . $type, |
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JsonBinaryDecoderException::UNKNOWN_JSON_TYPE_CODE |
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); |
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} |
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return new JsonBinaryDecoderValue(true, $data, $type); |
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} |
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private function readLiteral(): ?bool |
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{ |
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$literal = ord($this->binaryDataReader->read(BinaryDataReader::UNSIGNED_SHORT_LENGTH)); |
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if (self::LITERAL_NULL === $literal) { |
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return null; |
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} |
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if (self::LITERAL_TRUE === $literal) { |
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return true; |
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} |
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if (self::LITERAL_FALSE === $literal) { |
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return false; |
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} |
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return null; |
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} |
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325
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private function readVariableInt(): int |
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{ |
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$maxBytes = min($this->binaryDataReader->getBinaryDataLength(), 5); |
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$len = 0; |
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for ($i = 0; $i < $maxBytes; ++$i) { |
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$size = $this->binaryDataReader->readUInt8(); |
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// Get the next 7 bits of the length. |
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$len |= ($size & 0x7f) << (7 * $i); |
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if (($size & 0x80) === 0) { |
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// This was the last byte. Return successfully. |
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return $len; |
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} |
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} |
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return $len; |
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} |
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342
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/** |
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* @throws JsonBinaryDecoderException |
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* @throws BinaryDataReaderException |
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*/ |
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private function assignValues(JsonBinaryDecoderValue $jsonBinaryDecoderValue): void |
347
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{ |
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if (false === $jsonBinaryDecoderValue->isIsResolved()) { |
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$this->ensureOffset($jsonBinaryDecoderValue->getOffset()); |
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$this->parseJson($jsonBinaryDecoderValue->getType()); |
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} else if (null === $jsonBinaryDecoderValue->getValue()) { |
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$this->jsonBinaryDecoderFormatter->formatValueNull(); |
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} else if (is_bool($jsonBinaryDecoderValue->getValue())) { |
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$this->jsonBinaryDecoderFormatter->formatValueBool($jsonBinaryDecoderValue->getValue()); |
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} else if (is_numeric($jsonBinaryDecoderValue->getValue())) { |
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$this->jsonBinaryDecoderFormatter->formatValueNumeric($jsonBinaryDecoderValue->getValue()); |
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} |
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} |
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|
360
|
|
|
private function ensureOffset(?int $ensureOffset): void |
361
|
|
|
{ |
362
|
|
|
if (null === $ensureOffset) { |
363
|
|
|
return; |
364
|
|
|
} |
365
|
|
|
$pos = $this->binaryDataReader->getReadBytes(); |
366
|
|
|
if ($pos !== $ensureOffset) { |
367
|
|
|
if ($ensureOffset < $pos) { |
368
|
|
|
return; |
369
|
|
|
} |
370
|
|
|
$this->binaryDataReader->advance($ensureOffset + 1 - $pos); |
371
|
|
|
} |
372
|
|
|
} |
373
|
|
|
} |