init

vendor/binsoul/net-mqtt/src/StreamParser.php

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+<?php
+
+namespace BinSoul\Net\Mqtt;
+
+use BinSoul\Net\Mqtt\Exception\EndOfStreamException;
+use BinSoul\Net\Mqtt\Exception\MalformedPacketException;
+use BinSoul\Net\Mqtt\Exception\UnknownPacketTypeException;
+
+/**
+ * Provides methods to parse a stream of bytes into packets.
+ */
+class StreamParser
+{
+    /** @var PacketStream */
+    private $buffer;
+    /** @var PacketFactory */
+    private $factory;
+    /** @var callable */
+    private $errorCallback;
+
+    /**
+     * Constructs an instance of this class.
+     */
+    public function __construct()
+    {
+        $this->buffer = new PacketStream();
+        $this->factory = new PacketFactory();
+    }
+
+    /**
+     * Registers an error callback.
+     *
+     * @param callable $callback
+     */
+    public function onError($callback)
+    {
+        $this->errorCallback = $callback;
+    }
+
+    /**
+     * Appends the given data to the internal buffer and parses it.
+     *
+     * @param string $data
+     *
+     * @return Packet[]
+     */
+    public function push($data)
+    {
+        $this->buffer->write($data);
+
+        $result = [];
+        while ($this->buffer->getRemainingBytes() > 0) {
+            $type = $this->buffer->readByte() >> 4;
+            try {
+                $packet = $this->factory->build($type);
+            } catch (UnknownPacketTypeException $e) {
+                $this->handleError($e);
+                continue;
+            }
+
+            $this->buffer->seek(-1);
+            $position = $this->buffer->getPosition();
+            try {
+                $packet->read($this->buffer);
+                $result[] = $packet;
+                $this->buffer->cut();
+            } catch (EndOfStreamException $e) {
+                $this->buffer->setPosition($position);
+                break;
+            } catch (MalformedPacketException $e) {
+                $this->handleError($e);
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Executes the registered error callback.
+     *
+     * @param \Throwable $exception
+     */
+    private function handleError($exception)
+    {
+        if ($this->errorCallback !== null) {
+            $callback = $this->errorCallback;
+            $callback($exception);
+        }
+    }
+}