mirror of
https://github.com/tahoe-lafs/tahoe-lafs.git
synced 2024-12-22 06:17:50 +00:00
51 lines
1.5 KiB
Python
51 lines
1.5 KiB
Python
from twisted.internet import defer
|
|
import sha
|
|
from allmydata.util import idlib
|
|
|
|
def netstring(s):
|
|
return "%d:%s," % (len(s), s)
|
|
|
|
class Encoder(object):
|
|
def __init__(self, infile, m):
|
|
self.infile = infile
|
|
self.k = 2
|
|
self.m = m
|
|
|
|
def do_upload(self, landlords):
|
|
dl = []
|
|
data = self.infile.read()
|
|
for (peerid, bucket_num, remotebucket) in landlords:
|
|
dl.append(remotebucket.callRemote('write', data))
|
|
dl.append(remotebucket.callRemote('close'))
|
|
|
|
return defer.DeferredList(dl)
|
|
|
|
class Decoder(object):
|
|
def __init__(self, outfile, k, m, verifierid):
|
|
self.outfile = outfile
|
|
self.k = 2
|
|
self.m = m
|
|
self._verifierid = verifierid
|
|
|
|
def start(self, buckets):
|
|
assert len(buckets) >= self.k
|
|
dl = []
|
|
for bucketnum, bucket in buckets[:self.k]:
|
|
d = bucket.callRemote("read")
|
|
dl.append(d)
|
|
d2 = defer.DeferredList(dl)
|
|
d2.addCallback(self._got_all_data)
|
|
return d2
|
|
|
|
def _got_all_data(self, resultslist):
|
|
shares = [results for success,results in resultslist if success]
|
|
assert len(shares) >= self.k
|
|
# here's where the Reed-Solomon magic takes place
|
|
self.outfile.write(shares[0])
|
|
hasher = sha.new(netstring("allmydata_v1_verifierid"))
|
|
hasher.update(shares[0])
|
|
vid = hasher.digest()
|
|
if self._verifierid:
|
|
assert self._verifierid == vid, "%s != %s" % (idlib.b2a(self._verifierid), idlib.b2a(vid))
|
|
|