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<?php |
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declare(strict_types=1); |
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namespace unreal4u\MQTT\Protocol; |
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use unreal4u\MQTT\DataTypes\Topic; |
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use unreal4u\MQTT\Exceptions\MustContainTopic; |
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use unreal4u\MQTT\Internals\PacketIdentifierFunctionality; |
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use unreal4u\MQTT\Internals\ProtocolBase; |
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use unreal4u\MQTT\Internals\WritableContent; |
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use unreal4u\MQTT\Internals\WritableContentInterface; |
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/** |
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* An UNSUBSCRIBE Packet is sent by the Client to the Server, to unsubscribe from topics. |
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*/ |
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final class Unsubscribe extends ProtocolBase implements WritableContentInterface |
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{ |
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use WritableContent, PacketIdentifierFunctionality; |
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const CONTROL_PACKET_VALUE = 10; |
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/** |
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* An array of topics on which unsubscribe to |
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* @var Topic[] |
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*/ |
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private $topics = []; |
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/** |
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* @return string |
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* @throws \unreal4u\MQTT\Exceptions\MustContainTopic |
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* @throws \OutOfRangeException |
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*/ |
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public function createVariableHeader(): string |
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{ |
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if (count($this->topics) === 0) { |
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throw new MustContainTopic('An unsubscribe command must contain at least one topic'); |
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} |
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// Unsubscribe must always send a 2 flag |
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$this->specialFlags = 2; |
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return $this->getPacketIdentifierBinaryRepresentation(); |
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} |
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/** |
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* @return string |
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* @throws \OutOfRangeException |
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*/ |
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public function createPayload(): string |
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{ |
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$output = ''; |
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foreach ($this->topics as $topic) { |
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// chr on QoS level is safe because it will create an 8-bit flag where the first 6 are only 0's |
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$output .= $this->createUTF8String($topic->getTopicName()); |
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} |
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return $output; |
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} |
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/** |
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* When the Server receives a SUBSCRIBE Packet from a Client, the Server MUST respond with a SUBACK Packet |
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* |
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* This can however not be in the same order, as we may be able to receive PUBLISH packets before getting a SUBACK |
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* back |
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* |
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* @see http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Toc398718134 (MQTT-3.8.4-1) |
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* @return bool |
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*/ |
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public function shouldExpectAnswer(): bool |
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{ |
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return true; |
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} |
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/** |
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* A subscription is based on filters, this function allows us to pass on filters |
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* |
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* @param Topic[] $topics |
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* @return Unsubscribe |
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*/ |
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public function addTopics(Topic ...$topics): self |
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{ |
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$this->topics = array_merge($this->topics, $topics); |
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$this->logger->debug('Topics added', ['totalTopics', count($this->topics)]); |
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return $this; |
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} |
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} |
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unreal4u /
mqtt
