lbry-sdk/lbrynet/core/server/BlobRequestHandler.py

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