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<?php |
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declare(strict_types=1); |
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namespace unreal4u\MQTT\Internals; |
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use unreal4u\MQTT\Exceptions\InvalidResponseType; |
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use unreal4u\MQTT\Utilities; |
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use function ord; |
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use function sprintf; |
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use function strlen; |
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/** |
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* Trait ReadableContent |
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* @package unreal4u\MQTT\Internals |
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*/ |
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trait ReadableContent |
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{ |
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/** |
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* The remaining length field may be from 1 to 4 bytes long, this field will represent that offset |
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* @var int |
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*/ |
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private $sizeOfRemainingLengthField = 1; |
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/** |
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* @param string $rawMQTTHeaders |
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* @param ClientInterface $client |
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* @return bool |
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* @throws InvalidResponseType |
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*/ |
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final public function instantiateObject(string $rawMQTTHeaders, ClientInterface $client): bool |
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{ |
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//var_dump(base64_encode($rawMQTTHeaders)); // Make it a bit easier to create unit tests |
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$this->checkControlPacketValue(ord($rawMQTTHeaders[0]) >> 4); |
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$this->fillObject($rawMQTTHeaders, $client); |
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return true; |
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} |
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/** |
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* Checks whether the control packet corresponds to this object |
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* |
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* @param int $controlPacketValue |
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* @return bool |
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* @throws InvalidResponseType |
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*/ |
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private function checkControlPacketValue(int $controlPacketValue): bool |
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{ |
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// Check whether the first byte corresponds to the expected control packet value |
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if (static::CONTROL_PACKET_VALUE !== $controlPacketValue) { |
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throw new InvalidResponseType(sprintf( |
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'Value of received value does not correspond to response (Expected: %d, Actual: %d)', |
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static::CONTROL_PACKET_VALUE, |
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$controlPacketValue |
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)); |
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} |
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return true; |
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} |
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/** |
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* Returns the correct format for the length in bytes of the remaining bytes |
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* |
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* @param ClientInterface $client |
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* @param string $rawMQTTHeaders |
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* @return int |
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*/ |
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private function performRemainingLengthFieldOperations( |
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string &$rawMQTTHeaders, |
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ClientInterface $client |
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): int { |
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// Early return: assume defaults if first digit has a value under 128, no further need for complex checks |
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if (ord($rawMQTTHeaders[1]) < 128) { |
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return ord($rawMQTTHeaders[1]); |
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} |
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// If we have less than 4 bytes now, we should really try to recover the rest of the remaining field data |
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4 |
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if (strlen($rawMQTTHeaders) < 4) { |
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// At this point we could actually read at least 128 as a minimum, but restrict it to what we need right now |
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$rawMQTTHeaders .= $client->readBrokerData(4 - strlen($rawMQTTHeaders)); |
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} |
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$remainingBytes = Utilities::convertRemainingLengthStringToInt(substr($rawMQTTHeaders, 1, 4)); |
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// Estimate how much longer is the remaining length field, this will also set $this->sizeOfRemainingLengthField |
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$this->calculateSizeOfRemainingLengthField($remainingBytes); |
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return $remainingBytes; |
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} |
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/** |
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* Sets the offset of the remaining length field |
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* |
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* @param int $size |
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* @return int |
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*/ |
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private function calculateSizeOfRemainingLengthField(int $size): int |
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{ |
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$blockSize = $iterations = 0; |
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while ($size >= $blockSize) { |
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$iterations++; |
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$blockSize = 128 ** $iterations; |
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} |
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$this->sizeOfRemainingLengthField = $iterations; |
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return $iterations; |
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} |
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/** |
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* All classes must implement how to handle the object filling |
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* @param string $rawMQTTHeaders |
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* @param ClientInterface $client |
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* @return ReadableContentInterface |
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*/ |
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abstract public function fillObject(string $rawMQTTHeaders, ClientInterface $client): ReadableContentInterface; |
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/** |
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* Any class can overwrite the default behaviour |
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* @param ClientInterface $client |
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* @param WritableContentInterface $originalRequest |
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* @return bool |
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*/ |
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1 |
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public function performSpecialActions(ClientInterface $client, WritableContentInterface $originalRequest): bool |
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{ |
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return false; |
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} |
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} |
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unreal4u /
mqtt
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