223 lines
8.5 KiB
Python
223 lines
8.5 KiB
Python
import logging
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from twisted.internet import defer
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from twisted.protocols.basic import FileSender
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from twisted.python.failure import Failure
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from zope.interface import implements
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from lbrynet.core.Offer import Offer
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from lbrynet.interfaces import IQueryHandlerFactory, IQueryHandler, IBlobSender
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log = logging.getLogger(__name__)
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class BlobRequestHandlerFactory(object):
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implements(IQueryHandlerFactory)
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def __init__(self, blob_manager, wallet, payment_rate_manager):
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self.blob_manager = blob_manager
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self.wallet = wallet
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self.payment_rate_manager = payment_rate_manager
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######### IQueryHandlerFactory #########
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def build_query_handler(self):
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q_h = BlobRequestHandler(self.blob_manager, self.wallet, self.payment_rate_manager)
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return q_h
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def get_primary_query_identifier(self):
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return 'requested_blob'
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def get_description(self):
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return "Blob Uploader - uploads blobs"
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class BlobRequestHandler(object):
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implements(IQueryHandler, IBlobSender)
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PAYMENT_RATE_QUERY = 'blob_data_payment_rate'
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BLOB_QUERY = 'requested_blob'
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AVAILABILITY_QUERY = 'requested_blobs'
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def __init__(self, blob_manager, wallet, payment_rate_manager):
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self.blob_manager = blob_manager
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self.payment_rate_manager = payment_rate_manager
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self.wallet = wallet
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self.query_identifiers = [self.PAYMENT_RATE_QUERY, self.BLOB_QUERY, self.AVAILABILITY_QUERY]
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self.peer = None
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self.blob_data_payment_rate = None
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self.read_handle = None
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self.currently_uploading = None
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self.file_sender = None
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self.blob_bytes_uploaded = 0
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self._blobs_requested = []
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######### IQueryHandler #########
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def register_with_request_handler(self, request_handler, peer):
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self.peer = peer
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request_handler.register_query_handler(self, self.query_identifiers)
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request_handler.register_blob_sender(self)
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def handle_queries(self, queries):
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response = defer.succeed({})
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log.debug("Handle query: %s", str(queries))
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if self.AVAILABILITY_QUERY in queries:
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self._blobs_requested = queries[self.AVAILABILITY_QUERY]
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response.addCallback(lambda r: self._reply_to_availability(r, self._blobs_requested))
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if self.PAYMENT_RATE_QUERY in queries:
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offered_rate = queries[self.PAYMENT_RATE_QUERY]
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offer = Offer(offered_rate)
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response.addCallback(lambda r: self._handle_payment_rate_query(offer, r))
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if self.BLOB_QUERY in queries:
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incoming = queries[self.BLOB_QUERY]
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response.addCallback(lambda r: self._reply_to_send_request(r, incoming))
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return response
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######### IBlobSender #########
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def send_blob_if_requested(self, consumer):
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if self.currently_uploading is not None:
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return self.send_file(consumer)
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return defer.succeed(True)
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def cancel_send(self, err):
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if self.currently_uploading is not None:
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self.currently_uploading.close_read_handle(self.read_handle)
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self.read_handle = None
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self.currently_uploading = None
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return err
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######### internal #########
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def _reply_to_availability(self, request, blobs):
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d = self._get_available_blobs(blobs)
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def set_available(available_blobs):
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log.debug("available blobs: %s", str(available_blobs))
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request.update({'available_blobs': available_blobs})
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return request
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d.addCallback(set_available)
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return d
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def _handle_payment_rate_query(self, offer, request):
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blobs = self._blobs_requested
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log.info("Offered rate %f LBC/mb for %i blobs", offer.rate, len(blobs))
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reply = self.payment_rate_manager.reply_to_offer(self.peer, blobs, offer)
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if reply.accepted:
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self.blob_data_payment_rate = offer.rate
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request[self.PAYMENT_RATE_QUERY] = "RATE_ACCEPTED"
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log.info("Accepted rate: %f", offer.rate)
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elif reply.too_low:
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request[self.PAYMENT_RATE_QUERY] = "RATE_TOO_LOW"
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log.info("Reject rate: %f", offer.rate)
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elif reply.is_unset:
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log.warning("Rate unset")
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request['incoming_blob'] = {'error': 'RATE_UNSET'}
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log.debug("Returning rate query result: %s", str(request))
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return request
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def _handle_blob_query(self, response, query):
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log.debug("Received the client's request to send a blob")
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response['incoming_blob'] = {}
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if self.blob_data_payment_rate is None:
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response['incoming_blob'] = {'error': "RATE_UNSET"}
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return response
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else:
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return self._send_blob(response, query)
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def _send_blob(self, response, query):
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d = self.blob_manager.get_blob(query, True)
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d.addCallback(self.open_blob_for_reading, response)
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return d
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def open_blob_for_reading(self, blob, response):
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response_fields = {}
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d = defer.succeed(None)
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if blob.is_validated():
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read_handle = blob.open_for_reading()
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if read_handle is not None:
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self.currently_uploading = blob
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self.read_handle = read_handle
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log.info("Sending %s to client", str(blob))
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response_fields['blob_hash'] = blob.blob_hash
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response_fields['length'] = blob.length
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response['incoming_blob'] = response_fields
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d.addCallback(lambda _: self.record_transaction(blob))
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d.addCallback(lambda _: response)
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return d
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log.debug("We can not send %s", str(blob))
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response['incoming_blob'] = {'error': 'BLOB_UNAVAILABLE'}
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d.addCallback(lambda _: response)
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return d
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def record_transaction(self, blob):
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d = self.blob_manager.add_blob_to_upload_history(str(blob), self.peer.host, self.blob_data_payment_rate)
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return d
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def _reply_to_send_request(self, response, incoming):
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response_fields = {}
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response['incoming_blob'] = response_fields
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if self.blob_data_payment_rate is None:
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log.debug("Rate not set yet")
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response['incoming_blob'] = {'error': 'RATE_UNSET'}
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return defer.succeed(response)
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else:
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log.debug("Requested blob: %s", str(incoming))
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d = self.blob_manager.get_blob(incoming, True)
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d.addCallback(lambda blob: self.open_blob_for_reading(blob, response))
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return d
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def _get_available_blobs(self, requested_blobs):
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d = self.blob_manager.completed_blobs(requested_blobs)
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return d
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def send_file(self, consumer):
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def _send_file():
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inner_d = start_transfer()
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# TODO: if the transfer fails, check if it's because the connection was cut off.
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# TODO: if so, perhaps bill the client
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inner_d.addCallback(lambda _: set_expected_payment())
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inner_d.addBoth(set_not_uploading)
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return inner_d
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def count_bytes(data):
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self.blob_bytes_uploaded += len(data)
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self.peer.update_stats('blob_bytes_uploaded', len(data))
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return data
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def start_transfer():
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self.file_sender = FileSender()
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log.debug("Starting the file upload")
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assert self.read_handle is not None, "self.read_handle was None when trying to start the transfer"
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d = self.file_sender.beginFileTransfer(self.read_handle, consumer, count_bytes)
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return d
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def set_expected_payment():
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log.debug("Setting expected payment")
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if self.blob_bytes_uploaded != 0 and self.blob_data_payment_rate is not None:
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# TODO: explain why 2**20
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self.wallet.add_expected_payment(self.peer,
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self.currently_uploading.length * 1.0 *
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self.blob_data_payment_rate / 2**20)
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self.blob_bytes_uploaded = 0
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self.peer.update_stats('blobs_uploaded', 1)
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return None
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def set_not_uploading(reason=None):
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if self.currently_uploading is not None:
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self.currently_uploading.close_read_handle(self.read_handle)
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self.read_handle = None
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self.currently_uploading = None
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self.file_sender = None
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if reason is not None and isinstance(reason, Failure):
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log.warning("Upload has failed. Reason: %s", reason.getErrorMessage())
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return _send_file()
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