mirror of
https://github.com/tahoe-lafs/tahoe-lafs.git
synced 2024-12-27 00:21:07 +00:00
669 lines
26 KiB
Python
669 lines
26 KiB
Python
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import os
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from zope.interface import implements
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from twisted.python import log, failure
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from twisted.internet import defer
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from twisted.application import service
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from foolscap import Referenceable
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from allmydata.util.hashutil import file_renewal_secret_hash, \
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file_cancel_secret_hash, bucket_renewal_secret_hash, \
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bucket_cancel_secret_hash, plaintext_hasher, \
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storage_index_chk_hash, plaintext_segment_hasher, key_hasher
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from allmydata import encode, storage, hashtree, uri
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from allmydata.util import idlib, mathutil
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from allmydata.interfaces import IUploadable, IUploader, IEncryptedUploadable
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from pycryptopp.cipher.aes import AES
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from cStringIO import StringIO
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class HaveAllPeersError(Exception):
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# we use this to jump out of the loop
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pass
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# this wants to live in storage, not here
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class TooFullError(Exception):
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pass
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# our current uri_extension is 846 bytes for small files, a few bytes
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# more for larger ones (since the filesize is encoded in decimal in a
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# few places). Ask for a little bit more just in case we need it. If
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# the extension changes size, we can change EXTENSION_SIZE to
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# allocate a more accurate amount of space.
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EXTENSION_SIZE = 1000
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class PeerTracker:
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def __init__(self, peerid, permutedid, connection,
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sharesize, blocksize, num_segments, num_share_hashes,
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storage_index,
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bucket_renewal_secret, bucket_cancel_secret):
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self.peerid = peerid
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self.permutedid = permutedid
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self.connection = connection # to an RIClient
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self.buckets = {} # k: shareid, v: IRemoteBucketWriter
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self.sharesize = sharesize
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#print "PeerTracker", peerid, permutedid, sharesize
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as = storage.allocated_size(sharesize,
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num_segments,
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num_share_hashes,
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EXTENSION_SIZE)
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self.allocated_size = as
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self.blocksize = blocksize
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self.num_segments = num_segments
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self.num_share_hashes = num_share_hashes
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self.storage_index = storage_index
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self._storageserver = None
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self.renew_secret = bucket_renewal_secret
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self.cancel_secret = bucket_cancel_secret
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def __repr__(self):
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return ("<PeerTracker for peer %s and SI %s>"
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% (idlib.b2a(self.peerid)[:4],
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idlib.b2a(self.storage_index)[:6]))
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def query(self, sharenums):
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if not self._storageserver:
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d = self.connection.callRemote("get_service", "storageserver")
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d.addCallback(self._got_storageserver)
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d.addCallback(lambda res: self._query(sharenums))
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return d
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return self._query(sharenums)
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def _got_storageserver(self, storageserver):
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self._storageserver = storageserver
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def _query(self, sharenums):
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#print " query", self.peerid, len(sharenums)
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d = self._storageserver.callRemote("allocate_buckets",
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self.storage_index,
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self.renew_secret,
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self.cancel_secret,
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sharenums,
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self.allocated_size,
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canary=Referenceable())
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d.addCallback(self._got_reply)
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return d
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def _got_reply(self, (alreadygot, buckets)):
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#log.msg("%s._got_reply(%s)" % (self, (alreadygot, buckets)))
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b = {}
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for sharenum, rref in buckets.iteritems():
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bp = storage.WriteBucketProxy(rref, self.sharesize,
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self.blocksize,
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self.num_segments,
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self.num_share_hashes,
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EXTENSION_SIZE)
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b[sharenum] = bp
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self.buckets.update(b)
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return (alreadygot, set(b.keys()))
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class Tahoe2PeerSelector:
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def __init__(self, upload_id):
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self.upload_id = upload_id
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self.query_count, self.good_query_count, self.bad_query_count = 0,0,0
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self.error_count = 0
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self.num_peers_contacted = 0
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self.last_failure_msg = None
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def __repr__(self):
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return "<Tahoe2PeerSelector for upload %s>" % self.upload_id
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def get_shareholders(self, client,
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storage_index, share_size, block_size,
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num_segments, total_shares, shares_of_happiness,
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push_to_ourselves):
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"""
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@return: a set of PeerTracker instances that have agreed to hold some
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shares for us
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"""
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self.total_shares = total_shares
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self.shares_of_happiness = shares_of_happiness
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self.homeless_shares = range(total_shares)
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# self.uncontacted_peers = list() # peers we haven't asked yet
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self.contacted_peers = [] # peers worth asking again
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self.contacted_peers2 = [] # peers that we have asked again
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self.use_peers = set() # PeerTrackers that have shares assigned to them
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self.preexisting_shares = {} # sharenum -> PeerTracker holding the share
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peers = client.get_permuted_peers(storage_index, push_to_ourselves)
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if not peers:
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raise encode.NotEnoughPeersError("client gave us zero peers")
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# figure out how much space to ask for
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# this needed_hashes computation should mirror
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# Encoder.send_all_share_hash_trees. We use an IncompleteHashTree
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# (instead of a HashTree) because we don't require actual hashing
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# just to count the levels.
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ht = hashtree.IncompleteHashTree(total_shares)
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num_share_hashes = len(ht.needed_hashes(0, include_leaf=True))
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# decide upon the renewal/cancel secrets, to include them in the
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# allocat_buckets query.
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client_renewal_secret = client.get_renewal_secret()
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client_cancel_secret = client.get_cancel_secret()
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file_renewal_secret = file_renewal_secret_hash(client_renewal_secret,
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storage_index)
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file_cancel_secret = file_cancel_secret_hash(client_cancel_secret,
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storage_index)
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trackers = [ PeerTracker(peerid, permutedid, conn,
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share_size, block_size,
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num_segments, num_share_hashes,
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storage_index,
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bucket_renewal_secret_hash(file_renewal_secret,
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peerid),
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bucket_cancel_secret_hash(file_cancel_secret,
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peerid),
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)
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for permutedid, peerid, conn in peers ]
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self.uncontacted_peers = trackers
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d = defer.maybeDeferred(self._loop)
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return d
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def _loop(self):
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if not self.homeless_shares:
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# all done
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msg = ("placed all %d shares, "
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"sent %d queries to %d peers, "
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"%d queries placed some shares, %d placed none, "
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"got %d errors" %
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(self.total_shares,
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self.query_count, self.num_peers_contacted,
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self.good_query_count, self.bad_query_count,
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self.error_count))
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log.msg("peer selection successful for %s: %s" % (self, msg))
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return self.use_peers
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if self.uncontacted_peers:
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peer = self.uncontacted_peers.pop(0)
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# TODO: don't pre-convert all peerids to PeerTrackers
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assert isinstance(peer, PeerTracker)
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shares_to_ask = set([self.homeless_shares.pop(0)])
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self.query_count += 1
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self.num_peers_contacted += 1
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d = peer.query(shares_to_ask)
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d.addBoth(self._got_response, peer, shares_to_ask,
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self.contacted_peers)
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return d
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elif self.contacted_peers:
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# ask a peer that we've already asked.
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num_shares = mathutil.div_ceil(len(self.homeless_shares),
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len(self.contacted_peers))
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peer = self.contacted_peers.pop(0)
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shares_to_ask = set(self.homeless_shares[:num_shares])
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self.homeless_shares[:num_shares] = []
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self.query_count += 1
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d = peer.query(shares_to_ask)
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d.addBoth(self._got_response, peer, shares_to_ask,
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self.contacted_peers2)
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return d
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elif self.contacted_peers2:
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# we've finished the second-or-later pass. Move all the remaining
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# peers back into self.contacted_peers for the next pass.
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self.contacted_peers.extend(self.contacted_peers2)
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self.contacted_peers[:] = []
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return self._loop()
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else:
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# no more peers. If we haven't placed enough shares, we fail.
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placed_shares = self.total_shares - len(self.homeless_shares)
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if placed_shares < self.shares_of_happiness:
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msg = ("placed %d shares out of %d total (%d homeless), "
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"sent %d queries to %d peers, "
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"%d queries placed some shares, %d placed none, "
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"got %d errors" %
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(self.total_shares - len(self.homeless_shares),
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self.total_shares, len(self.homeless_shares),
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self.query_count, self.num_peers_contacted,
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self.good_query_count, self.bad_query_count,
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self.error_count))
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msg = "peer selection failed for %s: %s" % (self, msg)
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if self.last_failure_msg:
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msg += " (%s)" % (self.last_failure_msg,)
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log.msg(msg)
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raise encode.NotEnoughPeersError(msg)
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else:
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# we placed enough to be happy, so we're done
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return self.use_peers
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def _got_response(self, res, peer, shares_to_ask, put_peer_here):
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if isinstance(res, failure.Failure):
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# This is unusual, and probably indicates a bug or a network
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# problem.
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log.msg("%s got error during peer selection: %s" % (peer, res))
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self.error_count += 1
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self.homeless_shares = list(shares_to_ask) + self.homeless_shares
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if (self.uncontacted_peers
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or self.contacted_peers
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or self.contacted_peers2):
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# there is still hope, so just loop
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pass
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else:
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# No more peers, so this upload might fail (it depends upon
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# whether we've hit shares_of_happiness or not). Log the last
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# failure we got: if a coding error causes all peers to fail
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# in the same way, this allows the common failure to be seen
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# by the uploader and should help with debugging
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msg = ("last failure (from %s) was: %s" % (peer, res))
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self.last_failure_msg = msg
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else:
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(alreadygot, allocated) = res
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progress = False
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for s in alreadygot:
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self.preexisting_shares[s] = peer
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if s in self.homeless_shares:
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self.homeless_shares.remove(s)
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progress = True
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# the PeerTracker will remember which shares were allocated on
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# that peer. We just have to remember to use them.
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if allocated:
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self.use_peers.add(peer)
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progress = True
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not_yet_present = set(shares_to_ask) - set(alreadygot)
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still_homeless = not_yet_present - set(allocated)
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if progress:
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# they accepted or already had at least one share, so
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# progress has been made
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self.good_query_count += 1
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else:
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self.bad_query_count += 1
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if still_homeless:
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# In networks with lots of space, this is very unusual and
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# probably indicates an error. In networks with peers that
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# are full, it is merely unusual. In networks that are very
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# full, it is common, and many uploads will fail. In most
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# cases, this is obviously not fatal, and we'll just use some
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# other peers.
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# some shares are still homeless, keep trying to find them a
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# home. The ones that were rejected get first priority.
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self.homeless_shares = (list(still_homeless)
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+ self.homeless_shares)
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# Since they were unable to accept all of our requests, so it
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# is safe to assume that asking them again won't help.
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else:
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# if they *were* able to accept everything, they might be
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# willing to accept even more.
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put_peer_here.append(peer)
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# now loop
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return self._loop()
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class EncryptAnUploadable:
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"""This is a wrapper that takes an IUploadable and provides
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IEncryptedUploadable."""
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implements(IEncryptedUploadable)
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def __init__(self, original):
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self.original = original
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self._encryptor = None
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self._plaintext_hasher = plaintext_hasher()
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self._plaintext_segment_hasher = None
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self._plaintext_segment_hashes = []
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self._params = None
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def get_size(self):
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return self.original.get_size()
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def set_serialized_encoding_parameters(self, params):
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self._params = params
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def _get_encryptor(self):
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if self._encryptor:
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return defer.succeed(self._encryptor)
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if self._params is not None:
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self.original.set_serialized_encoding_parameters(self._params)
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d = self.original.get_encryption_key()
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def _got(key):
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e = AES(key)
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self._encryptor = e
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storage_index = storage_index_chk_hash(key)
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assert isinstance(storage_index, str)
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# There's no point to having the SI be longer than the key, so we
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# specify that it is truncated to the same 128 bits as the AES key.
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assert len(storage_index) == 16 # SHA-256 truncated to 128b
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self._storage_index = storage_index
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return e
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d.addCallback(_got)
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return d
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def get_storage_index(self):
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d = self._get_encryptor()
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d.addCallback(lambda res: self._storage_index)
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return d
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def set_segment_size(self, segsize):
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self._segment_size = segsize
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def _get_segment_hasher(self):
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p = self._plaintext_segment_hasher
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if p:
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left = self._segment_size - self._plaintext_segment_hashed_bytes
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return p, left
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p = plaintext_segment_hasher()
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self._plaintext_segment_hasher = p
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self._plaintext_segment_hashed_bytes = 0
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return p, self._segment_size
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def _update_segment_hash(self, chunk):
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offset = 0
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while offset < len(chunk):
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p, segment_left = self._get_segment_hasher()
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chunk_left = len(chunk) - offset
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this_segment = min(chunk_left, segment_left)
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p.update(chunk[offset:offset+this_segment])
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self._plaintext_segment_hashed_bytes += this_segment
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if self._plaintext_segment_hashed_bytes == self._segment_size:
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# we've filled this segment
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self._plaintext_segment_hashes.append(p.digest())
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self._plaintext_segment_hasher = None
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offset += this_segment
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def read_encrypted(self, length):
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d = self._get_encryptor()
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d.addCallback(lambda res: self.original.read(length))
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def _got(data):
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assert isinstance(data, (tuple, list)), type(data)
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data = list(data)
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cryptdata = []
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# we use data.pop(0) instead of 'for chunk in data' to save
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# memory: each chunk is destroyed as soon as we're done with it.
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while data:
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chunk = data.pop(0)
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self._plaintext_hasher.update(chunk)
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self._update_segment_hash(chunk)
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cryptdata.append(self._encryptor.process(chunk))
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del chunk
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return cryptdata
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d.addCallback(_got)
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return d
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def get_plaintext_segment_hashtree_nodes(self, num_segments):
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if len(self._plaintext_segment_hashes) < num_segments:
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# close out the last one
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assert len(self._plaintext_segment_hashes) == num_segments-1
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p, segment_left = self._get_segment_hasher()
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self._plaintext_segment_hashes.append(p.digest())
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del self._plaintext_segment_hasher
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assert len(self._plaintext_segment_hashes) == num_segments
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ht = hashtree.HashTree(self._plaintext_segment_hashes)
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return defer.succeed(list(ht))
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def get_plaintext_hash(self):
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h = self._plaintext_hasher.digest()
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return defer.succeed(h)
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class CHKUploader:
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peer_selector_class = Tahoe2PeerSelector
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def __init__(self, client, options={}, wait_for_numpeers=None):
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assert wait_for_numpeers is None or isinstance(wait_for_numpeers, int), wait_for_numpeers
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self._client = client
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self._wait_for_numpeers = wait_for_numpeers
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self._options = options
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self._log_number = self._client.log("CHKUploader starting")
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def set_params(self, encoding_parameters):
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self._encoding_parameters = encoding_parameters
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def log(self, msg, parent=None):
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if parent is None:
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parent = self._log_number
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return self._client.log(msg, parent=parent)
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def start(self, uploadable):
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"""Start uploading the file.
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This method returns a Deferred that will fire with the URI (a
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string)."""
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uploadable = IUploadable(uploadable)
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self.log("starting upload of %s" % uploadable)
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eu = EncryptAnUploadable(uploadable)
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d = self.start_encrypted(eu)
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def _uploaded(res):
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d1 = uploadable.get_encryption_key()
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d1.addCallback(lambda key: self._compute_uri(res, key))
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return d1
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d.addCallback(_uploaded)
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return d
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def start_encrypted(self, encrypted):
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eu = IEncryptedUploadable(encrypted)
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e = encode.Encoder(self._options, self)
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e.set_params(self._encoding_parameters)
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d = e.set_encrypted_uploadable(eu)
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def _wait_for_peers(res):
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wait_for_numpeers = self._wait_for_numpeers
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if wait_for_numpeers is None:
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# wait_for_numpeers = e.get_param("share_counts")[0] # XXX
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wait_for_numpeers = 1
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d1 = self._client.introducer_client.when_enough_peers(wait_for_numpeers)
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d1.addCallback(lambda dummy: res)
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return d1
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d.addCallback(_wait_for_peers)
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d.addCallback(self.locate_all_shareholders)
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d.addCallback(self.set_shareholders, e)
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d.addCallback(lambda res: e.start())
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# this fires with the uri_extension_hash and other data
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return d
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def locate_all_shareholders(self, encoder):
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storage_index = encoder.get_param("storage_index")
|
|
upload_id = idlib.b2a(storage_index)[:6]
|
|
self.log("using storage index %s" % upload_id)
|
|
peer_selector = self.peer_selector_class(upload_id)
|
|
|
|
share_size = encoder.get_param("share_size")
|
|
block_size = encoder.get_param("block_size")
|
|
num_segments = encoder.get_param("num_segments")
|
|
k,desired,n = encoder.get_param("share_counts")
|
|
push_to_ourselves = self._options.get("push_to_ourselves", False)
|
|
|
|
gs = peer_selector.get_shareholders
|
|
d = gs(self._client, storage_index, share_size, block_size,
|
|
num_segments, n, desired, push_to_ourselves)
|
|
return d
|
|
|
|
def set_shareholders(self, used_peers, encoder):
|
|
"""
|
|
@param used_peers: a sequence of PeerTracker objects
|
|
"""
|
|
self.log("_send_shares, used_peers is %s" % (used_peers,))
|
|
for peer in used_peers:
|
|
assert isinstance(peer, PeerTracker)
|
|
buckets = {}
|
|
for peer in used_peers:
|
|
buckets.update(peer.buckets)
|
|
assert len(buckets) == sum([len(peer.buckets) for peer in used_peers])
|
|
encoder.set_shareholders(buckets)
|
|
|
|
def _compute_uri(self, (uri_extension_hash,
|
|
needed_shares, total_shares, size),
|
|
key):
|
|
u = uri.CHKFileURI(key=key,
|
|
uri_extension_hash=uri_extension_hash,
|
|
needed_shares=needed_shares,
|
|
total_shares=total_shares,
|
|
size=size,
|
|
)
|
|
return u.to_string()
|
|
|
|
def read_this_many_bytes(uploadable, size, prepend_data=[]):
|
|
if size == 0:
|
|
return defer.succeed([])
|
|
d = uploadable.read(size)
|
|
def _got(data):
|
|
assert isinstance(data, list)
|
|
bytes = sum([len(piece) for piece in data])
|
|
assert bytes > 0
|
|
assert bytes <= size
|
|
remaining = size - bytes
|
|
if remaining:
|
|
return read_this_many_bytes(uploadable, remaining,
|
|
prepend_data + data)
|
|
return prepend_data + data
|
|
d.addCallback(_got)
|
|
return d
|
|
|
|
class LiteralUploader:
|
|
|
|
def __init__(self, client, wait_for_numpeers, options={}):
|
|
self._client = client
|
|
self._options = options
|
|
|
|
def set_params(self, encoding_parameters):
|
|
pass
|
|
|
|
def start(self, uploadable):
|
|
uploadable = IUploadable(uploadable)
|
|
d = uploadable.get_size()
|
|
d.addCallback(lambda size: read_this_many_bytes(uploadable, size))
|
|
d.addCallback(lambda data: uri.LiteralFileURI("".join(data)))
|
|
d.addCallback(lambda u: u.to_string())
|
|
return d
|
|
|
|
def close(self):
|
|
pass
|
|
|
|
|
|
class ConvergentUploadMixin:
|
|
# to use this, the class it is mixed in to must have a seekable
|
|
# filehandle named self._filehandle
|
|
_params = None
|
|
_key = None
|
|
|
|
def set_serialized_encoding_parameters(self, params):
|
|
self._params = params
|
|
# ignored for now
|
|
|
|
def get_encryption_key(self):
|
|
if self._key is None:
|
|
f = self._filehandle
|
|
enckey_hasher = key_hasher()
|
|
#enckey_hasher.update(encoding_parameters) # TODO
|
|
f.seek(0)
|
|
BLOCKSIZE = 64*1024
|
|
while True:
|
|
data = f.read(BLOCKSIZE)
|
|
if not data:
|
|
break
|
|
enckey_hasher.update(data)
|
|
f.seek(0)
|
|
self._key = enckey_hasher.digest()[:16]
|
|
|
|
return defer.succeed(self._key)
|
|
|
|
class NonConvergentUploadMixin:
|
|
_key = None
|
|
|
|
def set_serialized_encoding_parameters(self, params):
|
|
pass
|
|
|
|
def get_encryption_key(self):
|
|
if self._key is None:
|
|
self._key = os.urandom(16)
|
|
return defer.succeed(self._key)
|
|
|
|
|
|
class FileHandle(ConvergentUploadMixin):
|
|
implements(IUploadable)
|
|
|
|
def __init__(self, filehandle):
|
|
self._filehandle = filehandle
|
|
|
|
def get_size(self):
|
|
self._filehandle.seek(0,2)
|
|
size = self._filehandle.tell()
|
|
self._filehandle.seek(0)
|
|
return defer.succeed(size)
|
|
|
|
def read(self, length):
|
|
return defer.succeed([self._filehandle.read(length)])
|
|
|
|
def close(self):
|
|
# the originator of the filehandle reserves the right to close it
|
|
pass
|
|
|
|
class FileName(FileHandle):
|
|
def __init__(self, filename):
|
|
FileHandle.__init__(self, open(filename, "rb"))
|
|
def close(self):
|
|
FileHandle.close(self)
|
|
self._filehandle.close()
|
|
|
|
class Data(FileHandle):
|
|
def __init__(self, data):
|
|
FileHandle.__init__(self, StringIO(data))
|
|
|
|
class Uploader(service.MultiService):
|
|
"""I am a service that allows file uploading.
|
|
"""
|
|
implements(IUploader)
|
|
name = "uploader"
|
|
uploader_class = CHKUploader
|
|
URI_LIT_SIZE_THRESHOLD = 55
|
|
|
|
DEFAULT_ENCODING_PARAMETERS = (25, 75, 100)
|
|
# this is a tuple of (needed, desired, total). 'needed' is the number of
|
|
# shares required to reconstruct a file. 'desired' means that we will
|
|
# abort an upload unless we can allocate space for at least this many.
|
|
# 'total' is the total number of shares created by encoding. If everybody
|
|
# has room then this is is how many we will upload.
|
|
|
|
def upload(self, uploadable, options={}, wait_for_numpeers=None):
|
|
assert wait_for_numpeers is None or isinstance(wait_for_numpeers, int), wait_for_numpeers
|
|
# this returns the URI
|
|
assert self.parent
|
|
assert self.running
|
|
push_to_ourselves = self.parent.get_push_to_ourselves()
|
|
if push_to_ourselves is not None:
|
|
options["push_to_ourselves"] = push_to_ourselves
|
|
|
|
uploadable = IUploadable(uploadable)
|
|
d = uploadable.get_size()
|
|
def _got_size(size):
|
|
uploader_class = self.uploader_class
|
|
if size <= self.URI_LIT_SIZE_THRESHOLD:
|
|
uploader_class = LiteralUploader
|
|
uploader = uploader_class(self.parent, options, wait_for_numpeers)
|
|
uploader.set_params(self.parent.get_encoding_parameters()
|
|
or self.DEFAULT_ENCODING_PARAMETERS)
|
|
return uploader.start(uploadable)
|
|
d.addCallback(_got_size)
|
|
def _done(res):
|
|
uploadable.close()
|
|
return res
|
|
d.addBoth(_done)
|
|
return d
|
|
|
|
# utility functions
|
|
def upload_data(self, data, options={}):
|
|
return self.upload(Data(data), options)
|
|
def upload_filename(self, filename, options={}):
|
|
return self.upload(FileName(filename), options)
|
|
def upload_filehandle(self, filehandle, options={}):
|
|
return self.upload(FileHandle(filehandle), options)
|