import logging import json from twisted.python import failure from twisted.internet import error, defer from twisted.internet.protocol import Protocol, ServerFactory from lbrynet.core.utils import is_valid_blobhash from lbrynet.core.Error import DownloadCanceledError, InvalidBlobHashError, NoSuchSDHash from lbrynet.core.StreamDescriptor import BlobStreamDescriptorReader from lbrynet.lbry_file.StreamDescriptor import save_sd_info from lbrynet.reflector.common import REFLECTOR_V1, REFLECTOR_V2 from lbrynet.reflector.common import ReflectorRequestError, ReflectorClientVersionError log = logging.getLogger(__name__) MAXIMUM_QUERY_SIZE = 200 SEND_SD_BLOB = 'send_sd_blob' SEND_BLOB = 'send_blob' RECEIVED_SD_BLOB = 'received_sd_blob' RECEIVED_BLOB = 'received_blob' NEEDED_BLOBS = 'needed_blobs' VERSION = 'version' BLOB_SIZE = 'blob_size' BLOB_HASH = 'blob_hash' SD_BLOB_SIZE = 'sd_blob_size' SD_BLOB_HASH = 'sd_blob_hash' class ReflectorServer(Protocol): def connectionMade(self): peer_info = self.transport.getPeer() log.debug('Connection made to %s', peer_info) self.peer = self.factory.peer_manager.get_peer(peer_info.host, peer_info.port) self.blob_manager = self.factory.blob_manager self.stream_info_manager = self.factory.stream_info_manager self.protocol_version = self.factory.protocol_version self.received_handshake = False self.peer_version = None self.receiving_blob = False self.incoming_blob = None self.blob_finished_d = None self.request_buff = "" self.blob_writer = None def connectionLost(self, reason=failure.Failure(error.ConnectionDone())): log.info("Reflector upload from %s finished" % self.peer.host) def handle_error(self, err): log.error(err.getTraceback()) self.transport.loseConnection() def send_response(self, response_dict): self.transport.write(json.dumps(response_dict)) ############################ # Incoming blob file stuff # ############################ def clean_up_failed_upload(self, err, blob): log.warning("Failed to receive %s", blob) if err.check(DownloadCanceledError): self.blob_manager.delete_blobs([blob.blob_hash]) else: log.exception(err) @defer.inlineCallbacks def check_head_blob_announce(self, stream_hash): blob_infos = yield self.stream_info_manager.get_blobs_for_stream(stream_hash) blob_hash, blob_num, blob_iv, blob_length = blob_infos[0] if blob_hash in self.blob_manager.blobs: head_blob = self.blob_manager.blobs[blob_hash] if head_blob.get_is_verified(): should_announce = yield self.blob_manager.get_should_announce(blob_hash) if should_announce == 0: yield self.blob_manager.set_should_announce(blob_hash, 1) log.info("Discovered previously completed head blob (%s), " "setting it to be announced", blob_hash[:8]) defer.returnValue(None) @defer.inlineCallbacks def check_sd_blob_announce(self, sd_hash): if sd_hash in self.blob_manager.blobs: sd_blob = self.blob_manager.blobs[sd_hash] if sd_blob.get_is_verified(): should_announce = yield self.blob_manager.get_should_announce(sd_hash) if should_announce == 0: yield self.blob_manager.set_should_announce(sd_hash, 1) log.info("Discovered previously completed sd blob (%s), " "setting it to be announced", sd_hash[:8]) try: yield self.stream_info_manager.get_stream_hash_for_sd_hash(sd_hash) except NoSuchSDHash: log.info("Adding blobs to stream") sd_info = yield BlobStreamDescriptorReader(sd_blob).get_info() yield save_sd_info(self.stream_info_manager, sd_info) yield self.stream_info_manager.save_sd_blob_hash_to_stream( sd_info['stream_hash'], sd_hash) defer.returnValue(None) @defer.inlineCallbacks def _on_completed_blob(self, blob, response_key): should_announce = False if response_key == RECEIVED_SD_BLOB: sd_info = yield BlobStreamDescriptorReader(blob).get_info() yield save_sd_info(self.stream_info_manager, sd_info) yield self.stream_info_manager.save_sd_blob_hash_to_stream(sd_info['stream_hash'], blob.blob_hash) should_announce = True # if we already have the head blob, set it to be announced now that we know it's # a head blob d = self.check_head_blob_announce(sd_info['stream_hash']) else: d = defer.succeed(None) stream_hash = yield self.stream_info_manager.get_stream_of_blob(blob.blob_hash) if stream_hash is not None: blob_num = yield self.stream_info_manager._get_blob_num_by_hash(stream_hash, blob.blob_hash) if blob_num == 0: should_announce = True sd_hashes = yield self.stream_info_manager.get_sd_blob_hashes_for_stream( stream_hash) # if we already have the sd blob, set it to be announced now that we know it's # a sd blob for sd_hash in sd_hashes: d.addCallback(lambda _: self.check_sd_blob_announce(sd_hash)) yield self.blob_manager.blob_completed(blob, should_announce=should_announce) yield self.close_blob() yield d log.info("Received %s", blob) yield self.send_response({response_key: True}) @defer.inlineCallbacks def _on_failed_blob(self, err, response_key): yield self.clean_up_failed_upload(err, self.incoming_blob) yield self.send_response({response_key: False}) def handle_incoming_blob(self, response_key): """ Open blob for writing and send a response indicating if the transfer was successful when finished. response_key will either be received_blob or received_sd_blob """ blob = self.incoming_blob self.blob_writer, self.blob_finished_d = blob.open_for_writing(self.peer) self.blob_finished_d.addCallback(self._on_completed_blob, response_key) self.blob_finished_d.addErrback(self._on_failed_blob, response_key) def close_blob(self): self.blob_writer.close() self.blob_writer = None self.blob_finished_d = None self.incoming_blob = None self.receiving_blob = False #################### # Request handling # #################### def dataReceived(self, data): if self.receiving_blob: self.blob_writer.write(data) else: log.debug('Not yet recieving blob, data needs further processing') self.request_buff += data msg, extra_data = self._get_valid_response(self.request_buff) if msg is not None: self.request_buff = '' d = self.handle_request(msg) d.addErrback(self.handle_error) if self.receiving_blob and extra_data: log.debug('Writing extra data to blob') self.blob_writer.write(extra_data) def _get_valid_response(self, response_msg): extra_data = None response = None curr_pos = 0 while not self.receiving_blob: next_close_paren = response_msg.find('}', curr_pos) if next_close_paren != -1: curr_pos = next_close_paren + 1 try: response = json.loads(response_msg[:curr_pos]) except ValueError: if curr_pos > MAXIMUM_QUERY_SIZE: raise ValueError("Error decoding response: %s" % str(response_msg)) else: pass else: extra_data = response_msg[curr_pos:] break else: break return response, extra_data def need_handshake(self): return self.received_handshake is False def is_descriptor_request(self, request_dict): if SD_BLOB_HASH not in request_dict or SD_BLOB_SIZE not in request_dict: return False if not is_valid_blobhash(request_dict[SD_BLOB_HASH]): raise InvalidBlobHashError(request_dict[SD_BLOB_HASH]) return True def is_blob_request(self, request_dict): if BLOB_HASH not in request_dict or BLOB_SIZE not in request_dict: return False if not is_valid_blobhash(request_dict[BLOB_HASH]): raise InvalidBlobHashError(request_dict[BLOB_HASH]) return True def handle_request(self, request_dict): if self.need_handshake(): return self.handle_handshake(request_dict) if self.is_descriptor_request(request_dict): return self.handle_descriptor_request(request_dict) if self.is_blob_request(request_dict): return self.handle_blob_request(request_dict) raise ReflectorRequestError("Invalid request") def handle_handshake(self, request_dict): """ Upon connecting, the client sends a version handshake: { 'version': int, } The server replies with the same version if it is supported { 'version': int, } """ if VERSION not in request_dict: raise ReflectorRequestError("Client should send version") if int(request_dict[VERSION]) not in [REFLECTOR_V1, REFLECTOR_V2]: raise ReflectorClientVersionError("Unknown version: %i" % int(request_dict[VERSION])) self.peer_version = int(request_dict[VERSION]) log.debug('Handling handshake for client version %i', self.peer_version) self.received_handshake = True return self.send_handshake_response() def send_handshake_response(self): d = defer.succeed({VERSION: self.peer_version}) d.addCallback(self.send_response) return d def handle_descriptor_request(self, request_dict): """ If the client is reflecting a whole stream, they send a stream descriptor request: { 'sd_blob_hash': str, 'sd_blob_size': int } The server indicates if it's aware of this stream already by requesting (or not requesting) the stream descriptor blob. If the server has a validated copy of the sd blob, it will include the needed_blobs field (a list of blob hashes missing from reflector) in the response. If the server does not have the sd blob the needed_blobs field will not be included, as the server does not know what blobs it is missing - so the client should send all of the blobs in the stream. { 'send_sd_blob': bool 'needed_blobs': list, conditional } The client may begin the file transfer of the sd blob if send_sd_blob was True. If the client sends the blob, after receiving it the server indicates if the transfer was successful: { 'received_sd_blob': bool } """ sd_blob_hash = request_dict[SD_BLOB_HASH] sd_blob_size = request_dict[SD_BLOB_SIZE] if self.blob_writer is None: d = self.blob_manager.get_blob(sd_blob_hash, sd_blob_size) d.addCallback(self.get_descriptor_response) d.addCallback(self.send_response) else: self.receiving_blob = True d = self.blob_finished_d return d @defer.inlineCallbacks def get_descriptor_response(self, sd_blob): if sd_blob.get_is_verified(): # if we already have the sd blob being offered, make sure we have it and the head blob # marked as such for announcement now that we know it's an sd blob that we have. yield self.check_sd_blob_announce(sd_blob.blob_hash) try: stream_hash = yield self.stream_info_manager.get_stream_hash_for_sd_hash( sd_blob.blob_hash) except NoSuchSDHash: sd_info = yield BlobStreamDescriptorReader(sd_blob).get_info() stream_hash = sd_info['stream_hash'] yield save_sd_info(self.stream_info_manager, sd_info) yield self.stream_info_manager.save_sd_blob_hash_to_stream(stream_hash, sd_blob.blob_hash) yield self.check_head_blob_announce(stream_hash) response = yield self.request_needed_blobs({SEND_SD_BLOB: False}, sd_blob) else: self.incoming_blob = sd_blob self.receiving_blob = True self.handle_incoming_blob(RECEIVED_SD_BLOB) response = {SEND_SD_BLOB: True} defer.returnValue(response) def request_needed_blobs(self, response, sd_blob): def _add_needed_blobs_to_response(needed_blobs): response.update({NEEDED_BLOBS: needed_blobs}) return response d = self.determine_missing_blobs(sd_blob) d.addCallback(_add_needed_blobs_to_response) return d def determine_missing_blobs(self, sd_blob): reader = sd_blob.open_for_reading() sd_blob_data = reader.read() reader.close() decoded_sd_blob = json.loads(sd_blob_data) return self.get_unvalidated_blobs_in_stream(decoded_sd_blob) def get_unvalidated_blobs_in_stream(self, sd_blob): dl = defer.DeferredList(list(self._iter_unvalidated_blobs_in_stream(sd_blob)), consumeErrors=True) dl.addCallback(lambda needed: [blob[1] for blob in needed if blob[1]]) return dl def _iter_unvalidated_blobs_in_stream(self, sd_blob): for blob in sd_blob['blobs']: if 'blob_hash' in blob and 'length' in blob: blob_hash, blob_len = blob['blob_hash'], blob['length'] d = self.blob_manager.get_blob(blob_hash, blob_len) d.addCallback(lambda blob: blob_hash if not blob.get_is_verified() else None) yield d def handle_blob_request(self, request_dict): """ A client queries if the server will accept a blob { 'blob_hash': str, 'blob_size': int } The server replies, send_blob will be False if the server has a validated copy of the blob: { 'send_blob': bool } The client may begin the raw blob file transfer if the server replied True. If the client sends the blob, the server replies: { 'received_blob': bool } """ blob_hash = request_dict[BLOB_HASH] blob_size = request_dict[BLOB_SIZE] if self.blob_writer is None: log.debug('Received info for blob: %s', blob_hash[:16]) d = self.blob_manager.get_blob(blob_hash, blob_size) d.addCallback(self.get_blob_response) d.addCallback(self.send_response) else: log.debug('blob is already open') self.receiving_blob = True d = self.blob_finished_d return d def get_blob_response(self, blob): if blob.get_is_verified(): return defer.succeed({SEND_BLOB: False}) else: self.incoming_blob = blob self.receiving_blob = True self.handle_incoming_blob(RECEIVED_BLOB) d = defer.succeed({SEND_BLOB: True}) return d class ReflectorServerFactory(ServerFactory): protocol = ReflectorServer def __init__(self, peer_manager, blob_manager, stream_info_manager): self.peer_manager = peer_manager self.blob_manager = blob_manager self.stream_info_manager = stream_info_manager self.protocol_version = REFLECTOR_V2 def buildProtocol(self, addr): log.debug('Creating a protocol for %s', addr) return ServerFactory.buildProtocol(self, addr)