forked from LBRYCommunity/lbry-sdk
325 lines
12 KiB
Python
325 lines
12 KiB
Python
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
|
|
from lbrynet.core.StreamDescriptor import BlobStreamDescriptorReader
|
|
from lbrynet.core.StreamDescriptor import save_sd_info
|
|
from lbrynet.extras.reflector.common import REFLECTOR_V1, REFLECTOR_V2
|
|
from lbrynet.extras.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.storage = self.factory.blob_manager.storage
|
|
self.lbry_file_manager = self.factory.lbry_file_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 = b""
|
|
|
|
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).encode())
|
|
|
|
############################
|
|
# 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 _on_completed_blob(self, blob, response_key):
|
|
yield self.blob_manager.blob_completed(blob, should_announce=False)
|
|
|
|
if response_key == RECEIVED_SD_BLOB:
|
|
sd_info = yield BlobStreamDescriptorReader(blob).get_info()
|
|
yield save_sd_info(self.blob_manager, blob.blob_hash, sd_info)
|
|
yield self.blob_manager.set_should_announce(blob.blob_hash, True)
|
|
else:
|
|
stream_hash = yield self.storage.get_stream_of_blob(blob.blob_hash)
|
|
if stream_hash is not None:
|
|
blob_num = yield self.storage.get_blob_num_by_hash(stream_hash,
|
|
blob.blob_hash)
|
|
if blob_num == 0:
|
|
yield self.blob_manager.set_should_announce(blob.blob_hash, True)
|
|
|
|
yield self.close_blob()
|
|
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 receiving 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 = b''
|
|
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(b'}', 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():
|
|
sd_info = yield BlobStreamDescriptorReader(sd_blob).get_info()
|
|
yield save_sd_info(self.blob_manager, sd_blob.blob_hash, sd_info)
|
|
yield self.storage.verify_will_announce_head_and_sd_blobs(sd_info['stream_hash'])
|
|
response = yield self.request_needed_blobs({SEND_SD_BLOB: False}, sd_info['stream_hash'])
|
|
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)
|
|
|
|
@defer.inlineCallbacks
|
|
def request_needed_blobs(self, response, stream_hash):
|
|
needed_blobs = yield self.storage.get_pending_blobs_for_stream(stream_hash)
|
|
response.update({NEEDED_BLOBS: needed_blobs})
|
|
defer.returnValue(response)
|
|
|
|
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, lbry_file_manager):
|
|
self.peer_manager = peer_manager
|
|
self.blob_manager = blob_manager
|
|
self.lbry_file_manager = lbry_file_manager
|
|
self.protocol_version = REFLECTOR_V2
|
|
|
|
def buildProtocol(self, addr):
|
|
log.debug('Creating a protocol for %s', addr)
|
|
return ServerFactory.buildProtocol(self, addr)
|