Subscribe::initializeObject() - Code Metrics - Inspection of "Ensure no repeated topics are passed on to the bro..." - unreal4u/mqtt - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( d36af8...d37c8b )

by Camilo

created 2018-04-02 21:02 UTC

Subscribe::initializeObject() A

↳ Parent: Subscribe

Complexity

Conditions	1
Paths	1

Size

Total Lines	4
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	3
CRAP Score	1

Importance

Changes

Metric	Value
dl	0
loc	4
ccs	3
cts	3
cp	1
rs	10
c	0
b	0
f	0
cc	1
eloc	2
nc	1
nop	0
crap	1

<?php

declare(strict_types=1);

namespace unreal4u\MQTT\Protocol;

use unreal4u\MQTT\Application\EmptyReadableResponse;
use unreal4u\MQTT\Internals\ClientInterface;
use unreal4u\MQTT\Internals\EventManager;
use unreal4u\MQTT\Internals\PacketIdentifierFunctionality;
use unreal4u\MQTT\Internals\ProtocolBase;
use unreal4u\MQTT\Internals\ReadableContentInterface;
use unreal4u\MQTT\Internals\TopicFunctionality;
use unreal4u\MQTT\Internals\WritableContent;
use unreal4u\MQTT\Internals\WritableContentInterface;

/**
 * The SUBSCRIBE Packet is sent from the Client to the Server to create one or more Subscriptions.
 *
 * Each Subscription registers a Client’s interest in one or more Topics. The Server sends PUBLISH Packets to the Client
 * in order to forward Application Messages that were published to Topics that match these Subscriptions. The SUBSCRIBE
 * Packet also specifies (for each Subscription) the maximum QoS with which the Server can send Application Messages to
 * the Client.
 */
final class Subscribe extends ProtocolBase implements WritableContentInterface
{
    use WritableContent, PacketIdentifierFunctionality, TopicFunctionality;

    const CONTROL_PACKET_VALUE = 8;

    /**
     * Indicates whether to continue the loop or break it at any point, cleanly without disconnecting from the broker
     * @var bool
     */
    private $shouldLoop = true;

    protected function initializeObject(): ProtocolBase
    {
        $this->topics = new \SplQueue();
        return parent::initializeObject();
    }

    /**
     * @return string
     * @throws \OutOfRangeException
     * @throws \Exception
     */
    public function createVariableHeader(): string
    {
        // Subscribe must always send a 2 flag
        $this->specialFlags = 2;
        return $this->getPacketIdentifierBinaryRepresentation();
    }

    /**
     * @return string
     * @throws \unreal4u\MQTT\Exceptions\MustContainTopic
     * @throws \OutOfRangeException
     */
    public function createPayload(): string
    {
        $output = '';
        foreach ($this->getTopics() as $topic) {
            // chr on QoS level is safe because it will create an 8-bit flag where the first 6 are only 0's
            $output .= $this->createUTF8String($topic->getTopicName()) . \chr($topic->getTopicQoSLevel());
        }

        return $output;
    }

    /**
     * When the Server receives a SUBSCRIBE Packet from a Client, the Server MUST respond with a SUBACK Packet
     *
     * This can however not be in the same order, as we may be able to receive PUBLISH packets before getting a SUBACK
     * back
     *
     * @see http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Toc398718134 (MQTT-3.8.4-1)
     * @return bool
     */
    public function shouldExpectAnswer(): bool
    {
        return true;
    }

    /**
     * Performs a check on the socket connection and returns either the contents or an empty object
     *
     * @param ClientInterface $client
     * @return ReadableContentInterface
     * @throws \DomainException
     * @throws \unreal4u\MQTT\Exceptions\NotConnected
     * @throws \unreal4u\MQTT\Exceptions\Connect\NoConnectionParametersDefined
     */
    public function checkForEvent(ClientInterface $client): ReadableContentInterface
    {
        $this->checkPingTime($client);
        $publishPacketControlField = $client->readBrokerData(1);
        $eventManager = new EventManager($this->logger);

        if ((\ord($publishPacketControlField) & 255) > 0) {
            $this->logger->debug('Event received', [
                'ordValue' => \ord($publishPacketControlField) & 255,
                'length' => \strlen($publishPacketControlField)
            ]);
            return $eventManager->analyzeHeaders($publishPacketControlField, $client);
        }

        $this->logger->debug('No valid publish packet control field found, returning empty response');
        return new EmptyReadableResponse($this->logger);
    }

    /**
     * Loop and yields different type of results back whenever they are available
     *
     * Be aware that 1 second is 1000000 microseconds
     *
     * @param ClientInterface $client
     * @param int $idleMicroseconds The amount of microseconds the watcher should wait before checking the socket again
     * @param callable|null $hookBeforeLoop
     * @return \Generator
     * @throws \unreal4u\MQTT\Exceptions\NotConnected
     * @throws \unreal4u\MQTT\Exceptions\Connect\NoConnectionParametersDefined
     * @throws \DomainException
     */
    public function loop(
        ClientInterface $client,
        int $idleMicroseconds = 100000,
        callable $hookBeforeLoop = null
    ): \Generator {
        $this->shouldLoop = true;
        // First of all: subscribe
        $this->logger->debug('Beginning loop', ['idleMicroseconds' => $idleMicroseconds]);
        $readableContent = $client->processObject($this);

        // Allow the user to do certain stuff before looping, for example: an Unsubscribe
        if (\is_callable($hookBeforeLoop)) {
            $this->logger->notice('Callable detected, executing', ['userFunctionName' => $hookBeforeLoop]);
            $hookBeforeLoop($this->logger);
        }

        while ($this->shouldLoop === true) {
            $this->logger->debug('++Loop++');
            if ($readableContent instanceof Publish) {
                $readableContent->performSpecialActions($client, $this);
                // Only if we receive a Publish event from the broker, yield the contents
                yield $readableContent->getMessage();
            } else {
                // Only wait for a certain amount of time if there was nothing in the queue
                usleep($idleMicroseconds);
            }

            $readableContent = $this->checkForEvent($client);
        }
    }

    /**
     * Call this function to break out of the loop cleanly
     *
     * There is no way to know on which topics we are still subscribed on. This function lets us exit the above loop
     * cleanly without the need to disconnect from the broker.
     *
     * @return Subscribe
     */
    public function breakLoop(): self
    {
        $this->shouldLoop = false;
        return $this;
    }

    /**
     * @param ClientInterface $client
     * @return bool
     */
    protected function checkPingTime(ClientInterface $client): bool
    {
        if ($client->isItPingTime()) {
            $this->logger->info('Pinging is needed, sending PingReq');
            $client->processObject(new PingReq($this->logger));
        }

        return true;
    }
}


1		<?php
2
3		declare(strict_types=1);
4
5		namespace unreal4u\MQTT\Protocol;
6
7		use unreal4u\MQTT\Application\EmptyReadableResponse;
8		use unreal4u\MQTT\Internals\ClientInterface;
9		use unreal4u\MQTT\Internals\EventManager;
10		use unreal4u\MQTT\Internals\PacketIdentifierFunctionality;
11		use unreal4u\MQTT\Internals\ProtocolBase;
12		use unreal4u\MQTT\Internals\ReadableContentInterface;
13		use unreal4u\MQTT\Internals\TopicFunctionality;
14		use unreal4u\MQTT\Internals\WritableContent;
15		use unreal4u\MQTT\Internals\WritableContentInterface;
16
17		/**
18		* The SUBSCRIBE Packet is sent from the Client to the Server to create one or more Subscriptions.
19		*
20		* Each Subscription registers a Client’s interest in one or more Topics. The Server sends PUBLISH Packets to the Client
21		* in order to forward Application Messages that were published to Topics that match these Subscriptions. The SUBSCRIBE
22		* Packet also specifies (for each Subscription) the maximum QoS with which the Server can send Application Messages to
23		* the Client.
24		*/
25		final class Subscribe extends ProtocolBase implements WritableContentInterface
26		{
27		use WritableContent, PacketIdentifierFunctionality, TopicFunctionality;
28
29		const CONTROL_PACKET_VALUE = 8;
30
31		/**
32		* Indicates whether to continue the loop or break it at any point, cleanly without disconnecting from the broker
33		* @var bool
34		*/
35		private $shouldLoop = true;
36
37	10	protected function initializeObject(): ProtocolBase
38		{
39	10	$this->topics = new \SplQueue();
40	10	return parent::initializeObject();
41		}
42
43		/**
44		* @return string
45		* @throws \OutOfRangeException
46		* @throws \Exception
47		*/
48	2	public function createVariableHeader(): string
49		{
50		// Subscribe must always send a 2 flag
51	2	$this->specialFlags = 2;
52	2	return $this->getPacketIdentifierBinaryRepresentation();
53		}
54
55		/**
56		* @return string
57		* @throws \unreal4u\MQTT\Exceptions\MustContainTopic
58		* @throws \OutOfRangeException
59		*/
60	1	public function createPayload(): string
61		{
62	1	$output = '';
63	1	foreach ($this->getTopics() as $topic) {
64		// chr on QoS level is safe because it will create an 8-bit flag where the first 6 are only 0's
65	1	$output .= $this->createUTF8String($topic->getTopicName()) . \chr($topic->getTopicQoSLevel());
66		}
67
68	1	return $output;
69		}
70
71		/**
72		* When the Server receives a SUBSCRIBE Packet from a Client, the Server MUST respond with a SUBACK Packet
73		*
74		* This can however not be in the same order, as we may be able to receive PUBLISH packets before getting a SUBACK
75		* back
76		*
77		* @see http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Toc398718134 (MQTT-3.8.4-1)
78		* @return bool
79		*/
80	1	public function shouldExpectAnswer(): bool
81		{
82	1	return true;
83		}
84
85		/**
86		* Performs a check on the socket connection and returns either the contents or an empty object
87		*
88		* @param ClientInterface $client
89		* @return ReadableContentInterface
90		* @throws \DomainException
91		* @throws \unreal4u\MQTT\Exceptions\NotConnected
92		* @throws \unreal4u\MQTT\Exceptions\Connect\NoConnectionParametersDefined
93		*/
94	4	public function checkForEvent(ClientInterface $client): ReadableContentInterface
95		{
96	4	$this->checkPingTime($client);
97	4	$publishPacketControlField = $client->readBrokerData(1);
98	4	$eventManager = new EventManager($this->logger);
99
100	4	if ((\ord($publishPacketControlField) & 255) > 0) {
101	3	$this->logger->debug('Event received', [
102	3	'ordValue' => \ord($publishPacketControlField) & 255,
103	3	'length' => \strlen($publishPacketControlField)
104		]);
105	3	return $eventManager->analyzeHeaders($publishPacketControlField, $client);
106		}
107
108	3	$this->logger->debug('No valid publish packet control field found, returning empty response');
109	3	return new EmptyReadableResponse($this->logger);
110		}
111
112		/**
113		* Loop and yields different type of results back whenever they are available
114		*
115		* Be aware that 1 second is 1000000 microseconds
116		*
117		* @param ClientInterface $client
118		* @param int $idleMicroseconds The amount of microseconds the watcher should wait before checking the socket again
119		* @param callable\|null $hookBeforeLoop
120		* @return \Generator
121		* @throws \unreal4u\MQTT\Exceptions\NotConnected
122		* @throws \unreal4u\MQTT\Exceptions\Connect\NoConnectionParametersDefined
123		* @throws \DomainException
124		*/
125	2	public function loop(
126		ClientInterface $client,
127		int $idleMicroseconds = 100000,
128		callable $hookBeforeLoop = null
129		): \Generator {
130	2	$this->shouldLoop = true;
131		// First of all: subscribe
132	2	$this->logger->debug('Beginning loop', ['idleMicroseconds' => $idleMicroseconds]);
133	2	$readableContent = $client->processObject($this);
134
135		// Allow the user to do certain stuff before looping, for example: an Unsubscribe
136	2	if (\is_callable($hookBeforeLoop)) {
137	1	$this->logger->notice('Callable detected, executing', ['userFunctionName' => $hookBeforeLoop]);
138	1	$hookBeforeLoop($this->logger);
139		}
140
141	2	while ($this->shouldLoop === true) {
142	2	$this->logger->debug('++Loop++');
143	2	if ($readableContent instanceof Publish) {
144	2	$readableContent->performSpecialActions($client, $this);
145		// Only if we receive a Publish event from the broker, yield the contents
146	2	yield $readableContent->getMessage();
147		} else {
148		// Only wait for a certain amount of time if there was nothing in the queue
149	2	usleep($idleMicroseconds);
150		}
151
152	2	$readableContent = $this->checkForEvent($client);
153		}
154	2	}
155
156		/**
157		* Call this function to break out of the loop cleanly
158		*
159		* There is no way to know on which topics we are still subscribed on. This function lets us exit the above loop
160		* cleanly without the need to disconnect from the broker.
161		*
162		* @return Subscribe
163		*/
164	2	public function breakLoop(): self
165		{
166	2	$this->shouldLoop = false;
167	2	return $this;
168		}
169
170		/**
171		* @param ClientInterface $client
172		* @return bool
173		*/
174	5	protected function checkPingTime(ClientInterface $client): bool
175		{
176	5	if ($client->isItPingTime()) {
177	1	$this->logger->info('Pinging is needed, sending PingReq');
178	1	$client->processObject(new PingReq($this->logger));
179		}
180
181	5	return true;
182		}
183		}
184

unreal4u / mqtt

Push — master ( d36af8...d37c8b )

Subscribe::initializeObject() A

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