ProtocolParser::decompressBuffer() - Code Metrics - Inspection of "Implement support for compression (#8)" - PlasmaPHP/driver-mysql - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( af0de9...1b0f9b )

by Charlotte

created 2019-01-15 11:21 UTC

ProtocolParser::decompressBuffer() B

↳ Parent: ProtocolParser

Complexity

Conditions	6
Paths	10

Size

Total Lines	38
Code Lines	22

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	18
CRAP Score	6.3698

Importance

Changes

Metric	Value
cc	6
eloc	22
nc	10
nop	0
dl	0
loc	38
ccs	18
cts	23
cp	0.7826
crap	6.3698
rs	8.9457
c	0
b	0
f	0

<?php
/**
 * Plasma Driver MySQL component
 * Copyright 2018-2019 PlasmaPHP, All Rights Reserved
 *
 * Website: https://github.com/PlasmaPHP
 * License: https://github.com/PlasmaPHP/driver-mysql/blob/master/LICENSE
*/

namespace Plasma\Drivers\MySQL;

/**
 * The MySQL Protocol Parser.
 * @internal
 */
class ProtocolParser implements \Evenement\EventEmitterInterface {
    use \Evenement\EventEmitterTrait;
    
    /**
     * @var int
     */
    const STATE_INIT = 0;
    
    /**
     * @var int
     */
    const STATE_HANDSHAKE = 1;
    
    /**
     * @var int
     */
    const STATE_HANDSHAKE_ERROR = 2;
    
    /**
     * @var int
     */
    const STATE_AUTH = 5;
    
    /**
     * @var int
     */
    const STATE_AUTH_SENT = 6;
    
    /**
     * @var int
     */
    const STATE_AUTH_ERROR = 7;
    
    /**
     * @var int
     */
    const STATE_OK = 9;
    
    /**
     * @var int
     */
    const CLIENT_CAPABILITIES = (
        \Plasma\Drivers\MySQL\CapabilityFlags::CLIENT_FOUND_ROWS |
        \Plasma\Drivers\MySQL\CapabilityFlags::CLIENT_LONG_PASSWORD |
        \Plasma\Drivers\MySQL\CapabilityFlags::CLIENT_LONG_FLAG |
        \Plasma\Drivers\MySQL\CapabilityFlags::CLIENT_LOCAL_FILES |
        \Plasma\Drivers\MySQL\CapabilityFlags::CLIENT_INTERACTIVE |
        \Plasma\Drivers\MySQL\CapabilityFlags::CLIENT_TRANSACTIONS |
        \Plasma\Drivers\MySQL\CapabilityFlags::CLIENT_SECURE_CONNECTION |
        \Plasma\Drivers\MySQL\CapabilityFlags::CLIENT_PROTOCOL_41 |
        \Plasma\Drivers\MySQL\CapabilityFlags::CLIENT_DEPRECATE_EOF
    );
    
    /**
     * @var int
     */
    const CLIENT_MAX_PACKET_SIZE = 0x1000000;
    
    /**
     * @var int
     */
    const CLIENT_CHARSET_NUMBER = 0x21;
    
    /**
     * @var \Plasma\Drivers\MySQL\Driver
     */
    protected $driver;
    
    /**
     * @var \React\Socket\ConnectionInterface
     */
    protected $connection;
    
    /**
     * @var int
     */
    protected $state = ProtocolParser::STATE_INIT;
    
    /**
     * @var \Plasma\BinaryBuffer
     */
    protected $buffer;
    
    /**
     * @var \Plasma\BinaryBuffer
     */
    protected $messageBuffer;
    
    /**
     * The sequence ID is incremented with each packet and may wrap around.
     * It starts at 0 and is reset to 0 when a new command begins in the Command Phase.
     * @var int
     * @see https://dev.mysql.com/doc/internals/en/sequence-id.html
     */
    protected $sequenceID = -1;
    
    /**
     * Whether we use compression.
     * @var bool
     */
    protected $compressionEnabled = false;
    
    /**
     * The compression ID is incremented with each packet and may wrap around.
     * The compression ID is independent to the sequence ID.
     * @var int
     * @see https://dev.mysql.com/doc/internals/en/compressed-packet-header.html
     */
    protected $compressionID = -1;
    
    /**
     * Small packets should not be compressed. This defines a minimum size for compression.
     * @var int
     * @see https://dev.mysql.com/doc/internals/en/uncompressed-payload.html
     */
    protected $compressionSizeThreshold = 50;
    
    /**
     * @var \Plasma\BinaryBuffer
     */
    protected $compressionBuffer;
    
    /**
     * @var \Plasma\Drivers\MySQL\Messages\HandshakeMessage|null
     */
    protected $handshakeMessage;
    
    /**
     * @var \Plasma\Drivers\MySQL\Messages\OkResponseMessage|null
     */
    protected $lastOkMessage;
    
    /**
     * @var \Plasma\CommandInterface|null
     */
    protected $currentCommand;
    
    /**
     * @var callable|null
     */
    protected $parseCallback;
    
    /**
     * Constructor.
     * @param \Plasma\Drivers\MySQL\Driver       $driver
     * @param \React\Socket\ConnectionInterface  $connection
     */
    function __construct(\Plasma\Drivers\MySQL\Driver $driver, \React\Socket\ConnectionInterface $connection) {
        $this->driver = $driver;
        $this->connection = $connection;
        
        $this->buffer = new \Plasma\BinaryBuffer();
        $this->messageBuffer = new \Plasma\BinaryBuffer();
        $this->compressionBuffer = new \Plasma\BinaryBuffer();
        
        $this->addEvents();
    }
    
    /**
     * Invoke a command to execute.
     * @param \Plasma\CommandInterface|null  $command
     * @return void
     */
    function invokeCommand(?\Plasma\CommandInterface $command): void {
        if($command === null) {
            return;
        }
        
        $this->currentCommand = $command;
        $this->processCommand();
    }
    
    /**
     * Executes a command, without handling any aftermath.
     * The `onComplete` callback will be immediately invoked, regardless of the `waitForCompletion` value.
     * @param \Plasma\CommandInterface  $command
     * @return void
     */
    function executeCommand(\Plasma\CommandInterface $command): void {
        $this->processCommand($command);
    }
    
    /**
     * Marks the command itself as finished, if currently running.
     * @param \Plasma\Drivers\MySQL\Commands\CommandInterface  $command
     * @return void
     */
    function markCommandAsFinished(\Plasma\CommandInterface $command): void {
        if($command === $this->currentCommand) {
            $this->currentCommand = null;
        }
        
        $command->onComplete();
    }
    
    /**
     * Get the parser state.
     * @return int
     */
    function getState(): int {
        return $this->state;
    }
    
    /**
     * Get the handshake message, or null.
     * @return \Plasma\Drivers\MySQL\Messages\HandshakeMessage|null
     */
    function getHandshakeMessage(): ?\Plasma\Drivers\MySQL\Messages\HandshakeMessage {
        return $this->handshakeMessage;
    }
    
    /**
     * Get the last ok response message, or null.
     * @return \Plasma\Drivers\MySQL\Messages\OkResponseMessage|null
     */
    function getLastOkMessage(): ?\Plasma\Drivers\MySQL\Messages\OkResponseMessage {
        return $this->lastOkMessage;
    }
    
    /**
     * Enables compression.
     * @return void
     */
    function enableCompression(): void {
        $this->compressionEnabled = true;
    }
    
    /**
     * Sends a packet to the server.
     * @param string  $packet
     * @return void
     */
    function sendPacket(string $packet): void {
        $initPacklen = \strlen($packet);
        
        do {
            $partial = \substr($packet, 0, static::CLIENT_MAX_PACKET_SIZE);
            $partlen = \strlen($partial);
            
            $packet = \substr($packet, static::CLIENT_MAX_PACKET_SIZE);
            $packlen = \strlen($packet);
            
            $length = \Plasma\BinaryBuffer::writeInt3($partlen);
            $sequence = \Plasma\BinaryBuffer::writeInt1((++$this->sequenceID));
            
            $packet = $length.$sequence.$partial;
            
            if($this->compressionEnabled && $this->state === static::STATE_OK) {
                $packet = $this->compressPacket($packet);
            }
            
            $this->connection->write($packet);
        } while($packlen > static::CLIENT_MAX_PACKET_SIZE);
        
        // If the packet is exactly the max size, we have to send two packets
        if($initPacklen === static::CLIENT_MAX_PACKET_SIZE) {
            $length = \Plasma\BinaryBuffer::writeInt3(0);
            $sequence = \Plasma\BinaryBuffer::writeInt1((++$this->sequenceID));
            $this->connection->write($length.$sequence);
        }
    }
    
    /**
     * Sets the parse callback.
     * @param callable $callback
     * @return void
     */
    function setParseCallback(callable $callback): void {
        $this->parseCallback = $callback;
    }
    
    /**
     * Processes a command.
     * @param \Plasma\CommandInterface|null  $command
     * @return void
     */
    protected function processCommand(?\Plasma\CommandInterface $command = null) {
        if($command === null && $this->currentCommand instanceof \Plasma\CommandInterface) {
            $command = $this->currentCommand;
            
            if($this->currentCommand instanceof \Plasma\Drivers\MySQL\Commands\CommandInterface) {
                $state = $command->setParserState();
                if($state !== -1) {
                    $this->state = $state;
                }
            }
        }
        
        if($command === null) {
            return;
        }
        
        if(!($command instanceof \Plasma\Drivers\MySQL\Commands\CommandInterface) || $command->resetSequence()) {
            $this->sequenceID = -1;
            $this->compressionID = -1;
        }
        
        $this->sendPacket($command->getEncodedMessage());
        
        if($command !== $this->currentCommand || !$command->waitForCompletion()) {
            $command->onComplete();
            
            if($command === $this->currentCommand) {
                $this->currentCommand = null;
            }
        }
    }
    
    /**
     * Processes the buffer.
     * @return void
     */
    protected function processBuffer() {
        if($this->buffer->getSize() < 4) {
            return;
        }
        
        $buffer = clone $this->buffer;
        
        $length = $buffer->readInt3();
        $this->sequenceID = $buffer->readInt1();
        
        if($length === static::CLIENT_MAX_PACKET_SIZE) {
            $this->buffer->read(($length + 4));
            $this->messageBuffer->append($buffer->read($length));
            return;
        } elseif($this->messageBuffer->getSize() > 0) {
            $this->messageBuffer->append($buffer->read($length));
            $buffer = $this->messageBuffer;
            $this->messageBuffer = new \Plasma\BinaryBuffer();
        }
        
        if($buffer->getSize() < $length) {
            return;
        }
        
        if($length > 0) {
            $this->buffer->read(($length + 4));
            $buffer->slice(0, $length);
        } else {
            $this->buffer->slice($buffer->getSize());
        }
        
        if($buffer->getSize() === 0) {
            return;
        }
        
        /** @var \Plasma\Drivers\MySQL\Messages\MessageInterface  $message */
        $message = null;
        
        if($this->state === static::STATE_INIT) {
            $message = new \Plasma\Drivers\MySQL\Messages\HandshakeMessage($this);
        } else {
            $firstChar = $buffer->read(1);
            
            $okRespID = \Plasma\Drivers\MySQL\Messages\OkResponseMessage::getID();
            $isOkMessage = (
                (
                    $firstChar === $okRespID &&
                    (!($this->currentCommand instanceof \Plasma\Drivers\MySQL\Commands\QueryCommand)
                        || \strtoupper(\substr($this->currentCommand->getQuery(), 0, 6)) !== 'SELECT') // Fix for MySQL 5.7
                ) ||
                (
                    $firstChar === \Plasma\Drivers\MySQL\Messages\EOFMessage::getID() &&
                    ($this->handshakeMessage->capability & \Plasma\Drivers\MySQL\CapabilityFlags::CLIENT_DEPRECATE_EOF) !== 0
                )
            );
            
            switch(true) {
                case ($firstChar === \Plasma\Drivers\MySQL\Messages\ErrResponseMessage::getID()):
                    $message = new \Plasma\Drivers\MySQL\Messages\ErrResponseMessage($this);
                break;
                case ($this->currentCommand instanceof \Plasma\Drivers\MySQL\Commands\StatementPrepareCommand && $firstChar === $okRespID):
                    $message = new \Plasma\Drivers\MySQL\Messages\PrepareStatementOkMessage($this);
                break;
                case $isOkMessage:
                    $message = new \Plasma\Drivers\MySQL\Messages\OkResponseMessage($this);
                    $this->lastOkMessage = $message;
                break;
                case ($firstChar === \Plasma\Drivers\MySQL\Messages\EOFMessage::getID() && $length < 6):
                    $message = new \Plasma\Drivers\MySQL\Messages\EOFMessage($this);
                break;
                default:
                    $buffer->prepend($firstChar);
                    
                    if($this->parseCallback !== null) {
                        $parse = $this->parseCallback;
                        $this->parseCallback = null;
                        
                        $caller = new \Plasma\Drivers\MySQL\ProtocolOnNextCaller($this, $buffer);
                        $parse($caller);
                    } elseif($this->currentCommand !== null) {
                        $command = $this->currentCommand;
                        
                        $caller = new \Plasma\Drivers\MySQL\ProtocolOnNextCaller($this, $buffer);
                        $command->onNext($caller);
                        
                        if($command->hasFinished()) {
                            $this->currentCommand = null;
                            $command->onComplete();
                        }
                    }
                    
                    if($this->buffer->getSize() > 0) {
                        $this->driver->getLoop()->futureTick(function () {
                            $this->processBuffer();
                        });
                    }
                    
                    return;
                break;
            }
        }
        
        $state = $message->setParserState();
        if($state !== -1) {
            $this->state = $state;
        }
        
        if($message instanceof \Plasma\Drivers\MySQL\Messages\HandshakeMessage) {
            $this->handshakeMessage = $message;
        }
        
        $this->handleMessage($buffer, $message);
    }
    
    /**
     * Handles an incoming message.
     * @param \Plasma\BinaryBuffer                             $buffer
     * @param \Plasma\Drivers\MySQL\Messages\MessageInterface  $message
     * @return void
     */
    function handleMessage(\Plasma\BinaryBuffer $buffer, \Plasma\Drivers\MySQL\Messages\MessageInterface $message) {
        try {
            $buffer = $message->parseMessage($buffer);
            if(!$buffer) {
                return;
            }
            
            if($this->currentCommand !== null) {
                if(
                    ($message instanceof \Plasma\Drivers\MySQL\Messages\OkResponseMessage || $message instanceof \Plasma\Drivers\MySQL\Messages\EOFMessage)
                    && $this->currentCommand->hasFinished()
                ) {
                    $command = $this->currentCommand;
                    $this->currentCommand = null;
                    
                    $command->onComplete();
                } elseif($message instanceof \Plasma\Drivers\MySQL\Messages\ErrResponseMessage) {
                    $error = new \Plasma\Exception($message->errorMessage, $message->errorCode);
                    
                    $command = $this->currentCommand;
                    $this->currentCommand = null;
                    
                    $command->onError($error);
                } else {
                    $command = $this->currentCommand;
                    $command->onNext($message);
                    
                    if($command->hasFinished()) {
                        if($this->currentCommand === $command) {
                            $this->currentCommand = null;
                        }
                        
                        $command->onComplete();
                    }
                }
            } elseif($message instanceof \Plasma\Drivers\MySQL\Messages\ErrResponseMessage) {
                $error = new \Plasma\Exception($message->errorMessage, $message->errorCode);
                $this->emit('error', array($error));
            }
            
            $this->emit('message', array($message));
        } catch (\Plasma\Drivers\MySQL\Messages\ParseException $e) {
            $state = $e->getState();
            if($state !== null) {
                $this->state = $state;
            }
            
            $buffer = $e->getBuffer();
            if($buffer !== null) {
                $this->buffer->clear();
                $this->buffer->append($buffer);
            }
            
            if($this->currentCommand !== null) {
                $this->currentCommand->onError($e);
            }
            
            $this->emit('error', array($e));
            $this->connection->close();
        }
        
        if($this->buffer->getSize() > 0) {
            $this->driver->getLoop()->futureTick(function () {
                $this->processBuffer();
            });
        }
    }
    
    /**
     * Compresses a packet.
     * @param string  $packet
     * @return string
     */
    protected function compressPacket(string $packet): string {
        $length = \strlen($packet);
        $packetlen = \Plasma\BinaryBuffer::writeInt3($length);
        $id = \Plasma\BinaryBuffer::writeInt1((++$this->compressionID));
        
        if($length < $this->compressionSizeThreshold) {
            return $packetlen.$id.\Plasma\BinaryBuffer::writeInt3(0).$packet;
        }
        
        $compressed = \zlib_encode($packet, \ZLIB_ENCODING_DEFLATE);
        $compresslen = \Plasma\BinaryBuffer::writeInt3(\strlen($compressed));
        
        return $compresslen.$id.$compressed;
    }
    
    /**
     * Decompresses the buffer.
     * @return void
     */
    protected function decompressBuffer(): void {
        $buffer = new \Plasma\BinaryBuffer();
        
        // Copy packet header to new buffer
        for($i = 0; $i < 7; $i++) {
            $buffer->append($this->compressionBuffer[$i]);
        }
        
        $length = $buffer->readInt3();
        $this->compressionID = $buffer->readInt1();
        $uncompressedLength = $buffer->readInt3();
        
        if(($this->compressionBuffer->getSize() - 7) < $length) {
            return;
        }
        
        $this->compressionBuffer->read(7);
        $buffer = null;
        
        if($uncompressedLength === 0) {
            $this->buffer->append($this->compressionBuffer->read($length));
            return;
        }
        
        $rawPacket = $this->compressionBuffer->read($length);
        $packet = \zlib_decode($rawPacket, $uncompressedLength);
        
        if(\strlen($packet) !== $uncompressedLength) {
            $packet = "\xFF\x00\x00\x00     Invalid compressed packet";
            $this->connection->end($packet);
            
            return;
        }
        
        $this->buffer->append($packet);
        
        if($this->compressionBuffer->getSize() > 7) {
            $this->decompressBuffer();
        }
    }
    
    /**
     * Adds the events to the connection.
     * @return void
     */
    protected function addEvents() {
        $this->connection->on('data', function ($chunk) {
            if($this->compressionEnabled && $this->state === static::STATE_OK) {
                $this->compressionBuffer->append($chunk);
                
                if($this->compressionBuffer->getSize() > 7) {
                    $this->decompressBuffer();
                }
            } else {
                $this->buffer->append($chunk);
            }
            
            $this->processBuffer();
        });
        
        $this->connection->on('close', function () {
            $this->handleClose();
        });
    }
    
    /**
     * Connection close handler.
     * @return void
     */
    protected function handleClose() {
        if($this->state === static::STATE_AUTH || $this->state === static::STATE_AUTH_SENT) {
            $this->state = static::STATE_AUTH_ERROR;
        }
        
        $this->buffer->clear();
        $this->messageBuffer->clear();
        $this->compressionBuffer->clear();
    }
}


1		<?php
2		/**
3		* Plasma Driver MySQL component
4		* Copyright 2018-2019 PlasmaPHP, All Rights Reserved
5		*
6		* Website: https://github.com/PlasmaPHP
7		* License: https://github.com/PlasmaPHP/driver-mysql/blob/master/LICENSE
8		*/
9
10		namespace Plasma\Drivers\MySQL;
11
12		/**
13		* The MySQL Protocol Parser.
14		* @internal
15		*/
16		class ProtocolParser implements \Evenement\EventEmitterInterface {
17		use \Evenement\EventEmitterTrait;
18
19		/**
20		* @var int
21		*/
22		const STATE_INIT = 0;
23
24		/**
25		* @var int
26		*/
27		const STATE_HANDSHAKE = 1;
28
29		/**
30		* @var int
31		*/
32		const STATE_HANDSHAKE_ERROR = 2;
33
34		/**
35		* @var int
36		*/
37		const STATE_AUTH = 5;
38
39		/**
40		* @var int
41		*/
42		const STATE_AUTH_SENT = 6;
43
44		/**
45		* @var int
46		*/
47		const STATE_AUTH_ERROR = 7;
48
49		/**
50		* @var int
51		*/
52		const STATE_OK = 9;
53
54		/**
55		* @var int
56		*/
57		const CLIENT_CAPABILITIES = (
58		\Plasma\Drivers\MySQL\CapabilityFlags::CLIENT_FOUND_ROWS \|
59		\Plasma\Drivers\MySQL\CapabilityFlags::CLIENT_LONG_PASSWORD \|
60		\Plasma\Drivers\MySQL\CapabilityFlags::CLIENT_LONG_FLAG \|
61		\Plasma\Drivers\MySQL\CapabilityFlags::CLIENT_LOCAL_FILES \|
62		\Plasma\Drivers\MySQL\CapabilityFlags::CLIENT_INTERACTIVE \|
63		\Plasma\Drivers\MySQL\CapabilityFlags::CLIENT_TRANSACTIONS \|
64		\Plasma\Drivers\MySQL\CapabilityFlags::CLIENT_SECURE_CONNECTION \|
65		\Plasma\Drivers\MySQL\CapabilityFlags::CLIENT_PROTOCOL_41 \|
66		\Plasma\Drivers\MySQL\CapabilityFlags::CLIENT_DEPRECATE_EOF
67		);
68
69		/**
70		* @var int
71		*/
72		const CLIENT_MAX_PACKET_SIZE = 0x1000000;
73
74		/**
75		* @var int
76		*/
77		const CLIENT_CHARSET_NUMBER = 0x21;
78
79		/**
80		* @var \Plasma\Drivers\MySQL\Driver
81		*/
82		protected $driver;
83
84		/**
85		* @var \React\Socket\ConnectionInterface
86		*/
87		protected $connection;
88
89		/**
90		* @var int
91		*/
92		protected $state = ProtocolParser::STATE_INIT;
93
94		/**
95		* @var \Plasma\BinaryBuffer
96		*/
97		protected $buffer;
98
99		/**
100		* @var \Plasma\BinaryBuffer
101		*/
102		protected $messageBuffer;
103
104		/**
105		* The sequence ID is incremented with each packet and may wrap around.
106		* It starts at 0 and is reset to 0 when a new command begins in the Command Phase.
107		* @var int
108		* @see https://dev.mysql.com/doc/internals/en/sequence-id.html
109		*/
110		protected $sequenceID = -1;
111
112		/**
113		* Whether we use compression.
114		* @var bool
115		*/
116		protected $compressionEnabled = false;
117
118		/**
119		* The compression ID is incremented with each packet and may wrap around.
120		* The compression ID is independent to the sequence ID.
121		* @var int
122		* @see https://dev.mysql.com/doc/internals/en/compressed-packet-header.html
123		*/
124		protected $compressionID = -1;
125
126		/**
127		* Small packets should not be compressed. This defines a minimum size for compression.
128		* @var int
129		* @see https://dev.mysql.com/doc/internals/en/uncompressed-payload.html
130		*/
131		protected $compressionSizeThreshold = 50;
132
133		/**
134		* @var \Plasma\BinaryBuffer
135		*/
136		protected $compressionBuffer;
137
138		/**
139		* @var \Plasma\Drivers\MySQL\Messages\HandshakeMessage\|null
140		*/
141		protected $handshakeMessage;
142
143		/**
144		* @var \Plasma\Drivers\MySQL\Messages\OkResponseMessage\|null
145		*/
146		protected $lastOkMessage;
147
148		/**
149		* @var \Plasma\CommandInterface\|null
150		*/
151		protected $currentCommand;
152
153		/**
154		* @var callable\|null
155		*/
156		protected $parseCallback;
157
158		/**
159		* Constructor.
160		* @param \Plasma\Drivers\MySQL\Driver $driver
161		* @param \React\Socket\ConnectionInterface $connection
162		*/
163	60	function __construct(\Plasma\Drivers\MySQL\Driver $driver, \React\Socket\ConnectionInterface $connection) {
164	60	$this->driver = $driver;
165	60	$this->connection = $connection;
166
167	60	$this->buffer = new \Plasma\BinaryBuffer();
168	60	$this->messageBuffer = new \Plasma\BinaryBuffer();
169	60	$this->compressionBuffer = new \Plasma\BinaryBuffer();
170
171	60	$this->addEvents();
172	60	}
173
174		/**
175		* Invoke a command to execute.
176		* @param \Plasma\CommandInterface\|null $command
177		* @return void
178		*/
179	59	function invokeCommand(?\Plasma\CommandInterface $command): void {
180	59	if($command === null) {
181	56	return;
182		}
183
184	59	$this->currentCommand = $command;
185	59	$this->processCommand();
186	59	}
187
188		/**
189		* Executes a command, without handling any aftermath.
190		* The `onComplete` callback will be immediately invoked, regardless of the `waitForCompletion` value.
191		* @param \Plasma\CommandInterface $command
192		* @return void
193		*/
194		function executeCommand(\Plasma\CommandInterface $command): void {
195		$this->processCommand($command);
196		}
197
198		/**
199		* Marks the command itself as finished, if currently running.
200		* @param \Plasma\Drivers\MySQL\Commands\CommandInterface $command
201		* @return void
202		*/
203	56	function markCommandAsFinished(\Plasma\CommandInterface $command): void {
204	56	if($command === $this->currentCommand) {
205	56	$this->currentCommand = null;
206		}
207
208	56	$command->onComplete();
209	56	}
210
211		/**
212		* Get the parser state.
213		* @return int
214		*/
215	1	function getState(): int {
216	1	return $this->state;
217		}
218
219		/**
220		* Get the handshake message, or null.
221		* @return \Plasma\Drivers\MySQL\Messages\HandshakeMessage\|null
222		*/
223	59	function getHandshakeMessage(): ?\Plasma\Drivers\MySQL\Messages\HandshakeMessage {
224	59	return $this->handshakeMessage;
225		}
226
227		/**
228		* Get the last ok response message, or null.
229		* @return \Plasma\Drivers\MySQL\Messages\OkResponseMessage\|null
230		*/
231	4	function getLastOkMessage(): ?\Plasma\Drivers\MySQL\Messages\OkResponseMessage {
232	4	return $this->lastOkMessage;
233		}
234
235		/**
236		* Enables compression.
237		* @return void
238		*/
239	4	function enableCompression(): void {
240	4	$this->compressionEnabled = true;
241	4	}
242
243		/**
244		* Sends a packet to the server.
245		* @param string $packet
246		* @return void
247		*/
248	60	function sendPacket(string $packet): void {
249	60	$initPacklen = \strlen($packet);
250
251		do {
252	60	$partial = \substr($packet, 0, static::CLIENT_MAX_PACKET_SIZE);
253	60	$partlen = \strlen($partial);
254
255	60	$packet = \substr($packet, static::CLIENT_MAX_PACKET_SIZE);
256	60	$packlen = \strlen($packet);
257
258	60	$length = \Plasma\BinaryBuffer::writeInt3($partlen);
259	60	$sequence = \Plasma\BinaryBuffer::writeInt1((++$this->sequenceID));
260
261	60	$packet = $length.$sequence.$partial;
262
263	60	if($this->compressionEnabled && $this->state === static::STATE_OK) {
264	2	$packet = $this->compressPacket($packet);
265		}
266
267	60	$this->connection->write($packet);
268	60	} while($packlen > static::CLIENT_MAX_PACKET_SIZE);
269
270		// If the packet is exactly the max size, we have to send two packets
271	60	if($initPacklen === static::CLIENT_MAX_PACKET_SIZE) {
272	1	$length = \Plasma\BinaryBuffer::writeInt3(0);
273	1	$sequence = \Plasma\BinaryBuffer::writeInt1((++$this->sequenceID));
274	1	$this->connection->write($length.$sequence);
275		}
276	60	}
277
278		/**
279		* Sets the parse callback.
280		* @param callable $callback
281		* @return void
282		*/
283		function setParseCallback(callable $callback): void {
284		$this->parseCallback = $callback;
285		}
286
287		/**
288		* Processes a command.
289		* @param \Plasma\CommandInterface\|null $command
290		* @return void
291		*/
292	59	protected function processCommand(?\Plasma\CommandInterface $command = null) {
293	59	if($command === null && $this->currentCommand instanceof \Plasma\CommandInterface) {
294	59	$command = $this->currentCommand;
295
296	59	if($this->currentCommand instanceof \Plasma\Drivers\MySQL\Commands\CommandInterface) {
297	59	$state = $command->setParserState();
298	59	if($state !== -1) {
299	59	$this->state = $state;
300		}
301		}
302		}
303
304	59	if($command === null) {
305		return;
306		}
307
308	59	if(!($command instanceof \Plasma\Drivers\MySQL\Commands\CommandInterface) \|\| $command->resetSequence()) {
309	56	$this->sequenceID = -1;
310	56	$this->compressionID = -1;
311		}
312
313	59	$this->sendPacket($command->getEncodedMessage());
314
315	59	if($command !== $this->currentCommand \|\| !$command->waitForCompletion()) {
316	35	$command->onComplete();
317
318	35	if($command === $this->currentCommand) {
319	35	$this->currentCommand = null;
320		}
321		}
322	59	}
323
324		/**
325		* Processes the buffer.
326		* @return void
327		*/
328	59	protected function processBuffer() {
329	59	if($this->buffer->getSize() < 4) {
330		return;
331		}
332
333	59	$buffer = clone $this->buffer;
334
335	59	$length = $buffer->readInt3();
336	59	$this->sequenceID = $buffer->readInt1();
337
338	59	if($length === static::CLIENT_MAX_PACKET_SIZE) {
339		$this->buffer->read(($length + 4));
340		$this->messageBuffer->append($buffer->read($length));
341		return;
342	59	} elseif($this->messageBuffer->getSize() > 0) {
343		$this->messageBuffer->append($buffer->read($length));
344		$buffer = $this->messageBuffer;
345		$this->messageBuffer = new \Plasma\BinaryBuffer();
346		}
347
348	59	if($buffer->getSize() < $length) {
349		return;
350		}
351
352	59	if($length > 0) {
353	59	$this->buffer->read(($length + 4));
354	59	$buffer->slice(0, $length);
355		} else {
356		$this->buffer->slice($buffer->getSize());
357		}
358
359	59	if($buffer->getSize() === 0) {
360		return;
361		}
362
363		/** @var \Plasma\Drivers\MySQL\Messages\MessageInterface $message */
364	59	$message = null;
365
366	59	if($this->state === static::STATE_INIT) {
367	59	$message = new \Plasma\Drivers\MySQL\Messages\HandshakeMessage($this);
368		} else {
369	59	$firstChar = $buffer->read(1);
370
371	59	$okRespID = \Plasma\Drivers\MySQL\Messages\OkResponseMessage::getID();
372		$isOkMessage = (
373		(
374	59	$firstChar === $okRespID &&
375	58	(!($this->currentCommand instanceof \Plasma\Drivers\MySQL\Commands\QueryCommand)
376	58	\|\| \strtoupper(\substr($this->currentCommand->getQuery(), 0, 6)) !== 'SELECT') // Fix for MySQL 5.7
377		) \|\|
378		(
379	47	$firstChar === \Plasma\Drivers\MySQL\Messages\EOFMessage::getID() &&
380	59	($this->handshakeMessage->capability & \Plasma\Drivers\MySQL\CapabilityFlags::CLIENT_DEPRECATE_EOF) !== 0
381		)
382		);
383
384		switch(true) {
385	59	case ($firstChar === \Plasma\Drivers\MySQL\Messages\ErrResponseMessage::getID()):
386	1	$message = new \Plasma\Drivers\MySQL\Messages\ErrResponseMessage($this);
387	1	break;
388	58	case ($this->currentCommand instanceof \Plasma\Drivers\MySQL\Commands\StatementPrepareCommand && $firstChar === $okRespID):
389	36	$message = new \Plasma\Drivers\MySQL\Messages\PrepareStatementOkMessage($this);
390	36	break;
391	58	case $isOkMessage:
392	58	$message = new \Plasma\Drivers\MySQL\Messages\OkResponseMessage($this);
393	58	$this->lastOkMessage = $message;
394	58	break;
395	46	case ($firstChar === \Plasma\Drivers\MySQL\Messages\EOFMessage::getID() && $length < 6):
396		$message = new \Plasma\Drivers\MySQL\Messages\EOFMessage($this);
397		break;
398		default:
399	46	$buffer->prepend($firstChar);
400
401	46	if($this->parseCallback !== null) {
402		$parse = $this->parseCallback;
403		$this->parseCallback = null;
404
405		$caller = new \Plasma\Drivers\MySQL\ProtocolOnNextCaller($this, $buffer);
406		$parse($caller);
407	46	} elseif($this->currentCommand !== null) {
408	46	$command = $this->currentCommand;
409
410	46	$caller = new \Plasma\Drivers\MySQL\ProtocolOnNextCaller($this, $buffer);
411	46	$command->onNext($caller);
412
413	46	if($command->hasFinished()) {
414	36	$this->currentCommand = null;
415	36	$command->onComplete();
416		}
417		}
418
419	46	if($this->buffer->getSize() > 0) {
420		$this->driver->getLoop()->futureTick(function () {
421	46	$this->processBuffer();
422	46	});
423		}
424
425	46	return;
426		break;
427		}
428		}
429
430	59	$state = $message->setParserState();
431	59	if($state !== -1) {
432	59	$this->state = $state;
433		}
434
435	59	if($message instanceof \Plasma\Drivers\MySQL\Messages\HandshakeMessage) {
436	59	$this->handshakeMessage = $message;
437		}
438
439	59	$this->handleMessage($buffer, $message);
440	59	}
441
442		/**
443		* Handles an incoming message.
444		* @param \Plasma\BinaryBuffer $buffer
445		* @param \Plasma\Drivers\MySQL\Messages\MessageInterface $message
446		* @return void
447		*/
448	59	function handleMessage(\Plasma\BinaryBuffer $buffer, \Plasma\Drivers\MySQL\Messages\MessageInterface $message) {
449		try {
450	59	$buffer = $message->parseMessage($buffer);
451	59	if(!$buffer) {
452		return;
453		}
454
455	59	if($this->currentCommand !== null) {
456		if(
457	59	($message instanceof \Plasma\Drivers\MySQL\Messages\OkResponseMessage \|\| $message instanceof \Plasma\Drivers\MySQL\Messages\EOFMessage)
458	59	&& $this->currentCommand->hasFinished()
459		) {
460	58	$command = $this->currentCommand;
461	58	$this->currentCommand = null;
462
463	58	$command->onComplete();
464	57	} elseif($message instanceof \Plasma\Drivers\MySQL\Messages\ErrResponseMessage) {
465	1	$error = new \Plasma\Exception($message->errorMessage, $message->errorCode);
466
467	1	$command = $this->currentCommand;
468	1	$this->currentCommand = null;
469
470	1	$command->onError($error);
471		} else {
472	56	$command = $this->currentCommand;
473	56	$command->onNext($message);
474
475	56	if($command->hasFinished()) {
476	56	if($this->currentCommand === $command) {
477		$this->currentCommand = null;
478		}
479
480	59	$command->onComplete();
481		}
482		}
483	59	} elseif($message instanceof \Plasma\Drivers\MySQL\Messages\ErrResponseMessage) {
484		$error = new \Plasma\Exception($message->errorMessage, $message->errorCode);
485		$this->emit('error', array($error));
486		}
487
488	59	$this->emit('message', array($message));
489		} catch (\Plasma\Drivers\MySQL\Messages\ParseException $e) {
490		$state = $e->getState();
491		if($state !== null) {
492		$this->state = $state;
493		}
494
495		$buffer = $e->getBuffer();
496		if($buffer !== null) {
497		$this->buffer->clear();
498		$this->buffer->append($buffer);
499		}
500
501		if($this->currentCommand !== null) {
502		$this->currentCommand->onError($e);
503		}
504
505		$this->emit('error', array($e));
506		$this->connection->close();
507		}
508
509	59	if($this->buffer->getSize() > 0) {
510		$this->driver->getLoop()->futureTick(function () {
511	36	$this->processBuffer();
512	36	});
513		}
514	59	}
515
516		/**
517		* Compresses a packet.
518		* @param string $packet
519		* @return string
520		*/
521	2	protected function compressPacket(string $packet): string {
522	2	$length = \strlen($packet);
523	2	$packetlen = \Plasma\BinaryBuffer::writeInt3($length);
524	2	$id = \Plasma\BinaryBuffer::writeInt1((++$this->compressionID));
525
526	2	if($length < $this->compressionSizeThreshold) {
527	2	return $packetlen.$id.\Plasma\BinaryBuffer::writeInt3(0).$packet;
528		}
529
530		$compressed = \zlib_encode($packet, \ZLIB_ENCODING_DEFLATE);
531		$compresslen = \Plasma\BinaryBuffer::writeInt3(\strlen($compressed));
532
533		return $compresslen.$id.$compressed;
534		}
535
536		/**
537		* Decompresses the buffer.
538		* @return void
539		*/
540	2	protected function decompressBuffer(): void {
541	2	$buffer = new \Plasma\BinaryBuffer();
542
543		// Copy packet header to new buffer
544	2	for($i = 0; $i < 7; $i++) {
545	2	$buffer->append($this->compressionBuffer[$i]);
546		}
547
548	2	$length = $buffer->readInt3();
549	2	$this->compressionID = $buffer->readInt1();
550	2	$uncompressedLength = $buffer->readInt3();
551
552	2	if(($this->compressionBuffer->getSize() - 7) < $length) {
553		return;
554		}
555
556	2	$this->compressionBuffer->read(7);
557	2	$buffer = null;
558
559	2	if($uncompressedLength === 0) {
560	2	$this->buffer->append($this->compressionBuffer->read($length));
561	2	return;
562		}
563
564	1	$rawPacket = $this->compressionBuffer->read($length);
565	1	$packet = \zlib_decode($rawPacket, $uncompressedLength);
566
567	1	if(\strlen($packet) !== $uncompressedLength) {
568		$packet = "\xFF\x00\x00\x00 Invalid compressed packet";
569		$this->connection->end($packet);
570
571		return;
572		}
573
574	1	$this->buffer->append($packet);
575
576	1	if($this->compressionBuffer->getSize() > 7) {
577		$this->decompressBuffer();
578		}
579	1	}
580
581		/**
582		* Adds the events to the connection.
583		* @return void
584		*/
585	60	protected function addEvents() {
586		$this->connection->on('data', function ($chunk) {
587	59	if($this->compressionEnabled && $this->state === static::STATE_OK) {
588	2	$this->compressionBuffer->append($chunk);
589
590	2	if($this->compressionBuffer->getSize() > 7) {
591	2	$this->decompressBuffer();
592		}
593		} else {
594	59	$this->buffer->append($chunk);
595		}
596
597	59	$this->processBuffer();
598	60	});
599
600		$this->connection->on('close', function () {
601	3	$this->handleClose();
602	60	});
603	60	}
604
605		/**
606		* Connection close handler.
607		* @return void
608		*/
609	3	protected function handleClose() {
610	3	if($this->state === static::STATE_AUTH \|\| $this->state === static::STATE_AUTH_SENT) {
611		$this->state = static::STATE_AUTH_ERROR;
612		}
613
614	3	$this->buffer->clear();
615	3	$this->messageBuffer->clear();
616	3	$this->compressionBuffer->clear();
617	3	}
618		}
619

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ProtocolParser::decompressBuffer() B

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