3 * A NetworkPackage class. This class implements Deliverable and Receivable
4 * because all network packages should be deliverable to other nodes and
5 * receivable from other nodes. It further provides methods for reading raw
6 * content from template engines and feeding it to the stacker for undeclared
9 * The factory method requires you to provide a compressor class (which must
10 * implement the Compressor interface). If you don't want any compression (not
11 * adviceable due to increased network load), please use the NullCompressor
12 * class and encode it with BASE64 for a more error-free transfer over the
15 * For performance reasons, this class should only be instanciated once and then
16 * used as a "pipe-through" class.
18 * @author Roland Haeder <webmaster@ship-simu.org>
20 * @copyright Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2011 Hub Developer Team
21 * @license GNU GPL 3.0 or any newer version
22 * @link http://www.ship-simu.org
23 * @todo Needs to add functionality for handling the object's type
25 * This program is free software: you can redistribute it and/or modify
26 * it under the terms of the GNU General Public License as published by
27 * the Free Software Foundation, either version 3 of the License, or
28 * (at your option) any later version.
30 * This program is distributed in the hope that it will be useful,
31 * but WITHOUT ANY WARRANTY; without even the implied warranty of
32 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
33 * GNU General Public License for more details.
35 * You should have received a copy of the GNU General Public License
36 * along with this program. If not, see <http://www.gnu.org/licenses/>.
38 class NetworkPackage extends BaseFrameworkSystem implements Deliverable, Receivable, Registerable, Visitable {
40 * Package mask for compressing package data:
41 * 0: Compressor extension
43 * 2: Tags, seperated by semicolons, no semicolon is required if only one tag is needed
47 const PACKAGE_MASK = '%s%s%s%s%s%s%s';
50 * Separator for the above mask
52 const PACKAGE_MASK_SEPARATOR = '^';
55 * SEPARATOR for checksum
57 const PACKAGE_CHECKSUM_SEPARATOR = '_';
60 * Array indexes for above mask, start with zero
62 const INDEX_COMPRESSOR_EXTENSION = 0;
63 const INDEX_PACKAGE_DATA = 1;
65 const INDEX_CHECKSUM = 3;
68 * Array indexes for raw package array
70 const INDEX_PACKAGE_SENDER = 0;
71 const INDEX_PACKAGE_RECIPIENT = 1;
72 const INDEX_PACKAGE_CONTENT = 2;
73 const INDEX_PACKAGE_STATUS = 3;
76 * Named array elements for package data
78 const PACKAGE_DATA_SENDER = 'sender';
79 const PACKAGE_DATA_RECIPIENT = 'recipient';
80 const PACKAGE_DATA_CONTENT = 'content';
81 const PACKAGE_DATA_STATUS = 'status';
86 const PACKAGE_STATUS_NEW = 'new';
87 const PACKAGE_STATUS_FAILED = 'failed';
92 const PACKAGE_TAGS_SEPARATOR = ';';
95 * Raw package data SEPARATOR
97 const PACKAGE_DATA_SEPARATOR = '#';
100 * Stacker name for "undeclared" packages
102 const STACKER_NAME_UNDECLARED = 'package_undeclared';
105 * Stacker name for "declared" packages (which are ready to send out)
107 const STACKER_NAME_DECLARED = 'package_declared';
110 * Stacker name for "out-going" packages
112 const STACKER_NAME_OUTGOING = 'package_outgoing';
115 * Stacker name for "incoming" decoded raw data
117 const STACKER_NAME_DECODED_INCOMING = 'package_decoded_data';
120 * Stacker name for handled decoded raw data
122 const STACKER_NAME_DECODED_HANDLED = 'package_handled_decoded';
125 * Stacker name for "chunked" decoded raw data
127 const STACKER_NAME_DECODED_CHUNKED = 'package_chunked_decoded';
130 * Stacker name for "back-buffered" packages
132 const STACKER_NAME_BACK_BUFFER = 'package_backbuffer';
135 * Network target (alias): 'upper hubs'
137 const NETWORK_TARGET_UPPER_HUBS = 'upper';
140 * Network target (alias): 'self'
142 const NETWORK_TARGET_SELF = 'self';
145 * TCP package size in bytes
147 const TCP_PACKAGE_SIZE = 512;
150 * Protected constructor
154 protected function __construct () {
155 // Call parent constructor
156 parent::__construct(__CLASS__);
160 * Creates an instance of this class
162 * @param $compressorInstance A Compressor instance for compressing the content
163 * @return $packageInstance An instance of a Deliverable class
165 public static final function createNetworkPackage (Compressor $compressorInstance) {
167 $packageInstance = new NetworkPackage();
169 // Now set the compressor instance
170 $packageInstance->setCompressorInstance($compressorInstance);
173 * We need to initialize a stack here for our packages even for those
174 * which have no recipient address and stamp... ;-) This stacker will
175 * also be used for incoming raw data to handle it.
177 $stackerInstance = ObjectFactory::createObjectByConfiguredName('network_package_stacker_class');
179 // At last, set it in this class
180 $packageInstance->setStackerInstance($stackerInstance);
183 $packageInstance->initStackers();
185 // Get a visitor instance for speeding up things
186 $visitorInstance = ObjectFactory::createObjectByConfiguredName('node_raw_data_monitor_visitor_class', array($packageInstance));
188 // Set it in this package
189 $packageInstance->setVisitorInstance($visitorInstance);
191 // Return the prepared instance
192 return $packageInstance;
196 * Initialize all stackers
198 * @param $forceReInit Whether to force reinitialization of all stacks
201 protected function initStackers ($forceReInit = false) {
205 self::STACKER_NAME_UNDECLARED,
206 self::STACKER_NAME_DECLARED,
207 self::STACKER_NAME_OUTGOING,
208 self::STACKER_NAME_DECODED_INCOMING,
209 self::STACKER_NAME_DECODED_HANDLED,
210 self::STACKER_NAME_DECODED_CHUNKED,
211 self::STACKER_NAME_BACK_BUFFER
214 $this->getStackerInstance()->initStacker($stackerName, $forceReInit);
219 * "Getter" for hash from given content and helper instance
221 * @param $content Raw package content
222 * @param $helperInstance An instance of a HelpableHub class
223 * @param $nodeInstance An instance of a NodeHelper class
224 * @return $hash Hash for given package content
225 * @todo $helperInstance is unused
227 private function getHashFromContent ($content, HelpableHub $helperInstance, NodeHelper $nodeInstance) {
229 // @TODO crc32() is very weak, but it needs to be fast
232 self::PACKAGE_CHECKSUM_SEPARATOR .
233 $nodeInstance->getSessionId() .
234 self::PACKAGE_CHECKSUM_SEPARATOR .
235 $this->getCompressorInstance()->getCompressorExtension()
243 * Change the package with given status in given stack
245 * @param $packageData Raw package data in an array
246 * @param $stackerName Name of the stacker
247 * @param $newStatus New status to set
250 private function changePackageStatus (array $packageData, $stackerName, $newStatus) {
251 // Skip this for empty stacks
252 if ($this->getStackerInstance()->isStackEmpty($stackerName)) {
253 // This avoids an exception after all packages has failed
257 // Pop the entry (it should be it)
258 $this->getStackerInstance()->popNamed($stackerName);
260 // Temporary set the new status
261 $packageData[self::PACKAGE_DATA_STATUS] = $newStatus;
264 $this->getStackerInstance()->pushNamed($stackerName, $packageData);
267 ///////////////////////////////////////////////////////////////////////////
268 // Delivering packages / raw data
269 ///////////////////////////////////////////////////////////////////////////
272 * Delivers the given raw package data.
274 * @param $packageData Raw package data in an array
277 private function declareRawPackageData (array $packageData) {
279 * We need to disover every recipient, just in case we have a
280 * multi-recipient entry like 'upper' is. 'all' may be a not so good
281 * target because it causes an overload on the network and may be
282 * abused for attacking the network with large packages.
284 $discoveryInstance = PackageDiscoveryFactory::createPackageDiscoveryInstance();
286 // Discover all recipients, this may throw an exception
287 $discoveryInstance->discoverRecipients($packageData);
289 // Now get an iterator
290 $iteratorInstance = $discoveryInstance->getIterator();
292 // ... and begin iteration
293 while ($iteratorInstance->valid()) {
295 $currentRecipient = $iteratorInstance->current();
298 $this->debugOutput('PACKAGE: Package declared for recipient ' . $currentRecipient);
301 $packageData[self::PACKAGE_DATA_RECIPIENT] = $currentRecipient;
303 // And enqueue it to the writer class
304 $this->getStackerInstance()->pushNamed(self::STACKER_NAME_DECLARED, $packageData);
306 // Skip to next entry
307 $iteratorInstance->next();
311 * The recipient list can be cleaned up here because the package which
312 * shall be delivered has already been added for all entries from the
315 $discoveryInstance->clearRecipients();
319 * Delivers raw package data. In short, this will discover the raw socket
320 * resource through a discovery class (which will analyse the receipient of
321 * the package), register the socket with the connection (handler/helper?)
322 * instance and finally push the raw data on our outgoing queue.
324 * @param $packageData Raw package data in an array
327 private function deliverRawPackageData (array $packageData) {
329 * This package may become big, depending on the shared object size or
330 * delivered message size which shouldn't be so long (to save
331 * bandwidth). Because of the nature of the used protocol (TCP) we need
332 * to split it up into smaller pieces to fit it into a TCP frame.
334 * So first we need (again) a discovery class but now a protocol
335 * discovery to choose the right socket resource. The discovery class
336 * should take a look at the raw package data itself and then decide
337 * which (configurable!) protocol should be used for that type of
340 $discoveryInstance = SocketDiscoveryFactory::createSocketDiscoveryInstance();
342 // Now discover the right protocol
343 $socketResource = $discoveryInstance->discoverSocket($packageData);
346 //* NOISY-DEBUG: */ $this->debugOutput('NETWORK-PACKAGE: Reached line ' . __LINE__ . ' after discoverSocket() has been called.');
348 // We have to put this socket in our registry, so get an instance
349 $registryInstance = SocketRegistry::createSocketRegistry();
351 // Get the listener from registry
352 $helperInstance = Registry::getRegistry()->getInstance('connection');
355 //* NOISY-DEBUG: */ $this->debugOutput('NETWORK-PACKAGE: Reached line ' . __LINE__ . ' before isSocketRegistered() has been called.');
358 if ((is_resource($socketResource)) && (!$registryInstance->isSocketRegistered($helperInstance, $socketResource))) {
360 $registryInstance->registerSocket($helperInstance, $socketResource, $packageData);
364 //* NOISY-DEBUG: */ $this->debugOutput('NETWORK-PACKAGE: Reached line ' . __LINE__ . ' after isSocketRegistered() has been called.');
366 // Make sure the connection is up
367 $helperInstance->getStateInstance()->validatePeerStateConnected();
370 //* NOISY-DEBUG: */ $this->debugOutput('NETWORK-PACKAGE: Reached line ' . __LINE__ . ' after validatePeerStateConnected() has been called.');
372 // Enqueue it again on the out-going queue, the connection is up and working at this point
373 $this->getStackerInstance()->pushNamed(self::STACKER_NAME_OUTGOING, $packageData);
377 * Sends waiting packages
379 * @param $packageData Raw package data
382 private function sendOutgoingRawPackageData (array $packageData) {
386 // Get the right connection instance
387 $helperInstance = SocketRegistry::createSocketRegistry()->getHandlerInstanceFromPackageData($packageData);
389 // Is this connection still alive?
390 if ($helperInstance->isShuttedDown()) {
391 // This connection is shutting down
392 // @TODO We may want to do somthing more here?
396 // Sent out package data
397 $sentBytes = $helperInstance->sendRawPackageData($packageData);
399 // Remember unsent raw bytes in back-buffer, if any
400 $this->storeUnsentBytesInBackBuffer($packageData, $sentBytes);
404 * "Enqueues" raw content into this delivery class by reading the raw content
405 * from given template instance and pushing it on the 'undeclared' stack.
407 * @param $helperInstance An instance of a HelpableHub class
408 * @param $nodeInstance An instance of a NodeHelper class
411 public function enqueueRawDataFromTemplate (HelpableHub $helperInstance, NodeHelper $nodeInstance) {
412 // Get the raw content ...
413 $content = $helperInstance->getTemplateInstance()->getRawTemplateData();
415 // ... and compress it
416 $content = $this->getCompressorInstance()->compressStream($content);
418 // Add magic in front of it and hash behind it, including BASE64 encoding
419 $content = sprintf(self::PACKAGE_MASK,
420 // 1.) Compressor's extension
421 $this->getCompressorInstance()->getCompressorExtension(),
423 self::PACKAGE_MASK_SEPARATOR,
424 // 2.) Raw package content, encoded with BASE64
425 base64_encode($content),
427 self::PACKAGE_MASK_SEPARATOR,
429 implode(self::PACKAGE_TAGS_SEPARATOR, $helperInstance->getPackageTags()),
431 self::PACKAGE_MASK_SEPARATOR,
433 $this->getHashFromContent($content, $helperInstance, $nodeInstance)
436 // Now prepare the temporary array and push it on the 'undeclared' stack
437 $this->getStackerInstance()->pushNamed(self::STACKER_NAME_UNDECLARED, array(
438 self::PACKAGE_DATA_SENDER => $nodeInstance->getSessionId(),
439 self::PACKAGE_DATA_RECIPIENT => $helperInstance->getRecipientType(),
440 self::PACKAGE_DATA_CONTENT => $content,
441 self::PACKAGE_DATA_STATUS => self::PACKAGE_STATUS_NEW
446 * Checks wether a package has been enqueued for delivery.
448 * @return $isEnqueued Wether a package is enqueued
450 public function isPackageEnqueued () {
451 // Check wether the stacker is not empty
452 $isEnqueued = (($this->getStackerInstance()->isStackInitialized(self::STACKER_NAME_UNDECLARED)) && (!$this->getStackerInstance()->isStackEmpty(self::STACKER_NAME_UNDECLARED)));
459 * Checks wether a package has been declared
461 * @return $isDeclared Wether a package is declared
463 public function isPackageDeclared () {
464 // Check wether the stacker is not empty
465 $isDeclared = (($this->getStackerInstance()->isStackInitialized(self::STACKER_NAME_DECLARED)) && (!$this->getStackerInstance()->isStackEmpty(self::STACKER_NAME_DECLARED)));
472 * Checks wether a package should be sent out
474 * @return $isWaitingDelivery Wether a package is waiting for delivery
476 public function isPackageWaitingForDelivery () {
477 // Check wether the stacker is not empty
478 $isWaitingDelivery = (($this->getStackerInstance()->isStackInitialized(self::STACKER_NAME_OUTGOING)) && (!$this->getStackerInstance()->isStackEmpty(self::STACKER_NAME_OUTGOING)));
481 return $isWaitingDelivery;
485 * Delivers an enqueued package to the stated destination. If a non-session
486 * id is provided, recipient resolver is being asked (and instanced once).
487 * This allows that a single package is being delivered to multiple targets
488 * without enqueueing it for every target. If no target is provided or it
489 * can't be determined a NoTargetException is being thrown.
492 * @throws NoTargetException If no target can't be determined
494 public function declareEnqueuedPackage () {
495 // Make sure this method isn't working if there is no package enqueued
496 if (!$this->isPackageEnqueued()) {
497 // This is not fatal but should be avoided
498 // @TODO Add some logging here
502 // Now we know for sure there are packages to deliver, we can start
503 // with the first one.
504 $packageData = $this->getStackerInstance()->getNamed(self::STACKER_NAME_UNDECLARED);
506 // Declare the raw package data for delivery
507 $this->declareRawPackageData($packageData);
509 // And remove it finally
510 $this->getStackerInstance()->popNamed(self::STACKER_NAME_UNDECLARED);
514 * Delivers the next declared package. Only one package per time will be sent
515 * because this may take time and slows down the whole delivery
520 public function deliverDeclaredPackage () {
521 // Sanity check if we have packages declared
522 if (!$this->isPackageDeclared()) {
523 // This is not fatal but should be avoided
524 // @TODO Add some logging here
529 $packageData = $this->getStackerInstance()->getNamed(self::STACKER_NAME_DECLARED);
532 // And try to send it
533 $this->deliverRawPackageData($packageData);
535 // And remove it finally
536 $this->getStackerInstance()->popNamed(self::STACKER_NAME_DECLARED);
537 } catch (InvalidStateException $e) {
538 // The state is not excepected (shall be 'connected')
539 $this->debugOutput('PACKAGE: Caught exception ' . $e->__toString() . ' with message=' . $e->getMessage());
541 // Mark the package with status failed
542 $this->changePackageStatus($packageData, self::STACKER_NAME_DECLARED, self::PACKAGE_STATUS_FAILED);
547 * Sends waiting packages out for delivery
551 public function sendWaitingPackage () {
552 // Send any waiting bytes in the back-buffer before sending a new package
553 $this->sendBackBufferBytes();
555 // Sanity check if we have packages waiting for delivery
556 if (!$this->isPackageWaitingForDelivery()) {
557 // This is not fatal but should be avoided
558 $this->debugOutput('PACKAGE: No package is waiting for delivery, but ' . __METHOD__ . ' was called.');
563 $packageData = $this->getStackerInstance()->getNamed(self::STACKER_NAME_OUTGOING);
566 // Now try to send it
567 $this->sendOutgoingRawPackageData($packageData);
569 // And remove it finally
570 $this->getStackerInstance()->popNamed(self::STACKER_NAME_OUTGOING);
571 } catch (InvalidSocketException $e) {
572 // Output exception message
573 $this->debugOutput('PACKAGE: Package was not delivered: ' . $e->getMessage());
575 // Mark package as failed
576 $this->changePackageStatus($packageData, self::STACKER_NAME_OUTGOING, self::PACKAGE_STATUS_FAILED);
580 ///////////////////////////////////////////////////////////////////////////
581 // Receiving packages / raw data
582 ///////////////////////////////////////////////////////////////////////////
585 * Checks wether decoded raw data is pending
587 * @return $isPending Wether decoded raw data is pending
589 private function isDecodedDataPending () {
590 // Just return wether the stack is not empty
591 $isPending = (!$this->getStackerInstance()->isStackEmpty(self::STACKER_NAME_DECODED_INCOMING));
598 * Checks wether new raw package data has arrived at a socket
600 * @param $poolInstance An instance of a PoolableListener class
601 * @return $hasArrived Wether new raw package data has arrived for processing
603 public function isNewRawDataPending (PoolableListener $poolInstance) {
604 // Visit the pool. This monitors the pool for incoming raw data.
605 $poolInstance->accept($this->getVisitorInstance());
607 // Check for new data arrival
608 $hasArrived = $this->isDecodedDataPending();
615 * Handles the incoming decoded raw data. This method does not "convert" the
616 * decoded data back into a package array, it just "handles" it and pushs it
621 public function handleIncomingDecodedData () {
623 * This method should only be called if decoded raw data is pending,
626 if (!$this->isDecodedDataPending()) {
627 // This is not fatal but should be avoided
628 // @TODO Add some logging here
632 // Very noisy debug message:
633 /* NOISY-DEBUG: */ $this->debugOutput('PACKAGE: Stacker size is ' . $this->getStackerInstance()->getStackCount(self::STACKER_NAME_DECODED_INCOMING) . ' entries.');
635 // "Pop" the next entry (the same array again) from the stack
636 $decodedData = $this->getStackerInstance()->popNamed(self::STACKER_NAME_DECODED_INCOMING);
638 // Make sure both array elements are there
640 (is_array($decodedData)) &&
641 (isset($decodedData[BaseRawDataHandler::PACKAGE_DECODED_DATA])) &&
642 (isset($decodedData[BaseRawDataHandler::PACKAGE_ERROR_CODE]))
646 * Also make sure the error code is SOCKET_ERROR_UNHANDLED because we
647 * only want to handle unhandled packages here.
649 assert($decodedData[BaseRawDataHandler::PACKAGE_ERROR_CODE] == BaseRawDataHandler::SOCKET_ERROR_UNHANDLED);
651 // Remove the last chunk SEPARATOR (because it is being added and we don't need it)
652 if (substr($decodedData[BaseRawDataHandler::PACKAGE_DECODED_DATA], -1, 1) == PackageFragmenter::CHUNK_SEPARATOR) {
653 // It is there and should be removed
654 $decodedData[BaseRawDataHandler::PACKAGE_DECODED_DATA] = substr($decodedData[BaseRawDataHandler::PACKAGE_DECODED_DATA], 0, -1);
657 // This package is "handled" and can be pushed on the next stack
658 $this->getStackerInstance()->pushNamed(self::STACKER_NAME_DECODED_HANDLED, $decodedData);
662 * Adds raw decoded data from the given handler instance to this receiver
664 * @param $handlerInstance An instance of a Networkable class
667 public function addDecodedDataToIncomingStack (Networkable $handlerInstance) {
669 * Get the decoded data from the handler, this is an array with
670 * 'decoded_data' and 'error_code' as elements.
672 $decodedData = $handlerInstance->getNextDecodedData();
674 // Very noisy debug message:
675 //* NOISY-DEBUG: */ $this->debugOutput('PACKAGE: decodedData[' . gettype($decodedData) . ']=' . print_r($decodedData, true));
677 // And push it on our stack
678 $this->getStackerInstance()->pushNamed(self::STACKER_NAME_DECODED_INCOMING, $decodedData);
682 * Checks wether incoming decoded data is handled.
684 * @return $isHandled Wether incoming decoded data is handled
686 public function isIncomingDecodedDataHandled () {
687 // Determine if the stack is not empty
688 $isHandled = (!$this->getStackerInstance()->isStackEmpty(self::STACKER_NAME_DECODED_HANDLED));
695 * Assembles incoming decoded data so it will become an abstract network
696 * package again. The assembler does later do it's job by an other task,
697 * not this one to keep best speed possible.
701 public function assembleDecodedDataToPackage () {
702 // Make sure the raw decoded package data is handled
703 assert($this->isIncomingDecodedDataHandled());
705 // Get current package content (an array with two elements; see handleIncomingDecodedData() for details)
706 $packageContent = $this->getStackerInstance()->getNamed(self::STACKER_NAME_DECODED_HANDLED);
708 // Get a singleton package assembler instance from factory
709 $assemblerInstance = PackageAssemblerFactory::createAssemblerInstance();
711 // Start assembling the raw package data array by chunking it
712 $assemblerInstance->chunkPackageContent($packageContent);
714 // Remove the package from 'handled_decoded' stack ...
715 $this->getStackerInstance()->popNamed(self::STACKER_NAME_DECODED_HANDLED);
717 // ... and push it on the 'chunked' stacker
718 $this->getStackerInstance()->pushNamed(self::STACKER_NAME_DECODED_CHUNKED, $packageContent);
722 * Checks wether a new package has arrived
724 * @return $hasArrived Wether a new package has arrived for processing
726 public function isNewPackageArrived () {
727 // @TODO Add some content here
731 * Accepts the visitor to process the visit "request"
733 * @param $visitorInstance An instance of a Visitor class
736 public function accept (Visitor $visitorInstance) {
738 //* NOISY-DEBUG: */ $this->debugOutput('PACKAGE: ' . $visitorInstance->__toString() . ' has visited - START');
741 $visitorInstance->visitNetworkPackage($this);
744 //* NOISY-DEBUG: */ $this->debugOutput('PACKAGE: ' . $visitorInstance->__toString() . ' has visited - FINISHED');
752 public function clearAllStacker () {
753 // Call the init method to force re-initialization
754 $this->initStackers(true);
757 /* DEBUG: */ $this->debugOutput('PACKAGE: All stacker have been re-initialized.');
761 * Removes the first failed outoging package from the stack to continue
762 * with next one (it will never work until the issue is fixed by you).
765 * @throws UnexpectedPackageStatusException If the package status is not 'failed'
766 * @todo This may be enchanced for outgoing packages?
768 public function removeFirstFailedPackage () {
769 // Get the package again
770 $packageData = $this->getStackerInstance()->getNamed(self::STACKER_NAME_DECLARED);
772 // Is the package status 'failed'?
773 if ($packageData[self::PACKAGE_DATA_STATUS] != self::PACKAGE_STATUS_FAILED) {
775 throw new UnexpectedPackageStatusException(array($this, $packageData, self::PACKAGE_STATUS_FAILED), BaseListener::EXCEPTION_UNEXPECTED_PACKAGE_STATUS);
779 $this->getStackerInstance()->popNamed(self::STACKER_NAME_DECLARED);