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<?php |
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namespace Ekho\Logstash\Lumberjack; |
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class Client |
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{ |
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const SEQUENCE_MAX = 4294967295; |
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/** @var int */ |
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private $sequence = 0; |
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/** @var int */ |
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private $lastAck = 0; |
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/** @var int */ |
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private $windowSize; |
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/** @var SocketInterface */ |
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private $socket; |
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/** @var EncoderInterface */ |
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private $encoder; |
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/** |
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* @param SocketInterface $socket |
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* @param EncoderInterface $encoder |
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* @param int $windowSize |
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*/ |
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public function __construct(SocketInterface $socket, EncoderInterface $encoder, $windowSize = 5000) |
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{ |
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$this->socket = $socket; |
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$this->encoder = $encoder; |
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$this->setWindowSize($windowSize); |
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} |
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/** |
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* @param array $hash |
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* @return int |
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*/ |
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public function write(array $hash) |
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{ |
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$frame = $this->encoder->toCompressedFrame($hash, $this->nextSequence()); |
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if ($this->unackedSequenceSize() >= $this->windowSize) { |
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$this->ack(); |
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} |
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return $this->socket->write($frame); |
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} |
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/** |
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* @param int $windowSize |
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*/ |
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private function setWindowSize($windowSize) |
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{ |
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$this->windowSize = $windowSize; |
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$buffer = pack('AAN', "1", "W", $windowSize); |
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$this->socket->write($buffer); |
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} |
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/** |
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* @return int |
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*/ |
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private function nextSequence() |
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{ |
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1 |
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if ($this->sequence + 1 > self::SEQUENCE_MAX) { |
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$this->sequence = 0; |
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} |
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return ++$this->sequence; |
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} |
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/** |
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* @throws \RuntimeException |
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*/ |
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private function ack() |
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{ |
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list(, $type) = $this->readVersionAndType(); |
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if ($type != 'A') { |
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throw new \RuntimeException(sprintf("Whoa we shouldn't get this frame: %s", var_export($type, true))); |
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} |
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$this->lastAck = $this->readLastAck(); |
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if ($this->unackedSequenceSize() >= $this->windowSize) { |
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$this->ack(); |
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} |
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} |
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/** |
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* @return int |
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*/ |
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private function unackedSequenceSize() |
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{ |
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return $this->sequence - ($this->lastAck + 1); |
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} |
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/** |
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* @return array |
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*/ |
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private function readVersionAndType() |
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{ |
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$version = $this->socket->read(1); |
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$type = $this->socket->read(1); |
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return array($version, $type); |
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} |
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/** |
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* @return int |
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*/ |
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private function readLastAck() |
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{ |
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$unpacked = unpack('N', $this->socket->read(4)); |
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return reset($unpacked); |
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} |
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} |
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ekho /
lumberjack-php
