def _describe_immutable_share(abs_sharefile, now, si_s, out):
class ImmediateReadBucketProxy(ReadBucketProxy):
def __init__(self, sf):
self.sf = sf
ReadBucketProxy.__init__(self, None, None, "")
def __repr__(self):
return "<ImmediateReadBucketProxy>"
def _read(self, offset, size):
return defer.succeed(sf.read_share_data(offset, size))
# use a ReadBucketProxy to parse the bucket and find the uri extension
sf = ShareFile(abs_sharefile)
bp = ImmediateReadBucketProxy(sf)
expiration_time = min(lease.get_expiration_time()
for lease in sf.get_leases())
expiration = max(0, expiration_time - now)
UEB_data = call(bp.get_uri_extension)
unpacked = uri.unpack_extension_readable(UEB_data)
k = unpacked["needed_shares"]
N = unpacked["total_shares"]
filesize = unpacked["size"]
ueb_hash = unpacked["UEB_hash"]
print("CHK %s %d/%d %d %s %d %s" %
(si_s, k, N, filesize, str(
ueb_hash, "utf-8"), expiration, quote_output(abs_sharefile)),
file=out)
def _parse_and_store_UEB(self, UEB_s):
# Note: the UEB contains needed_shares and total_shares. These are
# redundant and inferior (the filecap contains the authoritative
# values). However, because it is possible to encode the same file in
# multiple ways, and the encoders might choose (poorly) to use the
# same key for both (therefore getting the same SI), we might
# encounter shares for both types. The UEB hashes will be different,
# however, and we'll disregard the "other" encoding's shares as
# corrupted.
# therefore, we ignore d['total_shares'] and d['needed_shares'].
d = uri.unpack_extension(UEB_s)
log.msg(format="UEB=%(ueb)s, vcap=%(vcap)s",
ueb=repr(uri.unpack_extension_readable(UEB_s)),
vcap=self._verifycap.to_string(),
level=log.NOISY, parent=self._lp, umid="cVqZnA")
k, N = self._verifycap.needed_shares, self._verifycap.total_shares
self.segment_size = d['segment_size']
self._segsize_observers.fire(self.segment_size)
r = self._calculate_sizes(self.segment_size)
self.tail_segment_size = r["tail_segment_size"]
self.tail_segment_padded = r["tail_segment_padded"]
self.num_segments = r["num_segments"]
self.block_size = r["block_size"]
self.tail_block_size = r["tail_block_size"]
log.msg("actual sizes: %s" % (r,),
level=log.NOISY, parent=self._lp, umid="PY6P5Q")
if (self.segment_size == self.guessed_segment_size
and self.num_segments == self.guessed_num_segments):
log.msg("my guess was right!",
level=log.NOISY, parent=self._lp, umid="x340Ow")
else:
log.msg("my guess was wrong! Extra round trips for me.",
level=log.NOISY, parent=self._lp, umid="tb7RJw")
# zfec.Decode() instantiation is fast, but still, let's use the same
# codec instance for all but the last segment. 3-of-10 takes 15us on
# my laptop, 25-of-100 is 900us, 3-of-255 is 97us, 25-of-255 is
# 2.5ms, worst-case 254-of-255 is 9.3ms
self._codec = CRSDecoder()
self._codec.set_params(self.segment_size, k, N)
# Ciphertext hash tree root is mandatory, so that there is at most
# one ciphertext that matches this read-cap or verify-cap. The
# integrity check on the shares is not sufficient to prevent the
# original encoder from creating some shares of file A and other
# shares of file B. self.ciphertext_hash_tree was a guess before:
# this is where we create it for real.
self.ciphertext_hash_tree = IncompleteHashTree(self.num_segments)
self.ciphertext_hash_tree_leaves = self.num_segments
self.ciphertext_hash_tree.set_hashes({0: d['crypttext_root_hash']})
self.share_hash_tree.set_hashes({0: d['share_root_hash']})
def _parse_and_store_UEB(self, UEB_s):
# Note: the UEB contains needed_shares and total_shares. These are
# redundant and inferior (the filecap contains the authoritative
# values). However, because it is possible to encode the same file in
# multiple ways, and the encoders might choose (poorly) to use the
# same key for both (therefore getting the same SI), we might
# encounter shares for both types. The UEB hashes will be different,
# however, and we'll disregard the "other" encoding's shares as
# corrupted.
# therefore, we ignore d['total_shares'] and d['needed_shares'].
d = uri.unpack_extension(UEB_s)
log.msg(format="UEB=%(ueb)s, vcap=%(vcap)s",
ueb=repr(uri.unpack_extension_readable(UEB_s)),
vcap=self._verifycap.to_string(),
level=log.NOISY, parent=self._lp, umid="cVqZnA")
k, N = self._verifycap.needed_shares, self._verifycap.total_shares
self.segment_size = d['segment_size']
self._segsize_observers.fire(self.segment_size)
r = self._calculate_sizes(self.segment_size)
self.tail_segment_size = r["tail_segment_size"]
self.tail_segment_padded = r["tail_segment_padded"]
self.num_segments = r["num_segments"]
self.block_size = r["block_size"]
self.tail_block_size = r["tail_block_size"]
log.msg("actual sizes: %s" % (r,),
level=log.NOISY, parent=self._lp, umid="PY6P5Q")
if (self.segment_size == self.guessed_segment_size
and self.num_segments == self.guessed_num_segments):
log.msg("my guess was right!",
level=log.NOISY, parent=self._lp, umid="x340Ow")
else:
log.msg("my guess was wrong! Extra round trips for me.",
level=log.NOISY, parent=self._lp, umid="tb7RJw")
# zfec.Decode() instantiation is fast, but still, let's use the same
# codec instance for all but the last segment. 3-of-10 takes 15us on
# my laptop, 25-of-100 is 900us, 3-of-255 is 97us, 25-of-255 is
# 2.5ms, worst-case 254-of-255 is 9.3ms
self._codec = CRSDecoder()
self._codec.set_params(self.segment_size, k, N)
# Ciphertext hash tree root is mandatory, so that there is at most
# one ciphertext that matches this read-cap or verify-cap. The
# integrity check on the shares is not sufficient to prevent the
# original encoder from creating some shares of file A and other
# shares of file B. self.ciphertext_hash_tree was a guess before:
# this is where we create it for real.
self.ciphertext_hash_tree = IncompleteHashTree(self.num_segments)
self.ciphertext_hash_tree_leaves = self.num_segments
self.ciphertext_hash_tree.set_hashes({0: d['crypttext_root_hash']})
self.share_hash_tree.set_hashes({0: d['share_root_hash']})
def test_pack(self):
data = {"stuff": "value", "size": 12, "needed_shares": 3, "big_hash": hashutil.tagged_hash("foo", "bar")}
ext = uri.pack_extension(data)
d = uri.unpack_extension(ext)
self.failUnlessReallyEqual(d["stuff"], "value")
self.failUnlessReallyEqual(d["size"], 12)
self.failUnlessReallyEqual(d["big_hash"], hashutil.tagged_hash("foo", "bar"))
readable = uri.unpack_extension_readable(ext)
self.failUnlessReallyEqual(readable["needed_shares"], 3)
self.failUnlessReallyEqual(readable["stuff"], "value")
self.failUnlessReallyEqual(readable["size"], 12)
self.failUnlessReallyEqual(readable["big_hash"], base32.b2a(hashutil.tagged_hash("foo", "bar")))
self.failUnlessReallyEqual(readable["UEB_hash"], base32.b2a(hashutil.uri_extension_hash(ext)))
def test_pack(self):
data = {"stuff": "value",
"size": 12,
"needed_shares": 3,
"big_hash": hashutil.tagged_hash("foo", "bar"),
}
ext = uri.pack_extension(data)
d = uri.unpack_extension(ext)
self.failUnlessReallyEqual(d["stuff"], "value")
self.failUnlessReallyEqual(d["size"], 12)
self.failUnlessReallyEqual(d["big_hash"], hashutil.tagged_hash("foo", "bar"))
readable = uri.unpack_extension_readable(ext)
self.failUnlessReallyEqual(readable["needed_shares"], 3)
self.failUnlessReallyEqual(readable["stuff"], "value")
self.failUnlessReallyEqual(readable["size"], 12)
self.failUnlessReallyEqual(readable["big_hash"],
base32.b2a(hashutil.tagged_hash("foo", "bar")))
self.failUnlessReallyEqual(readable["UEB_hash"],
base32.b2a(hashutil.uri_extension_hash(ext)))
def describe_share(abs_sharefile, si_s, shnum_s, now, out):
from allmydata import uri
from allmydata.storage.mutable import MutableShareFile
from allmydata.storage.immutable import ShareFile
from allmydata.mutable.layout import unpack_share
from allmydata.mutable.common import NeedMoreDataError
from allmydata.immutable.layout import ReadBucketProxy
from allmydata.util import base32
from allmydata.util.encodingutil import quote_output
import struct
f = open(abs_sharefile, "rb")
prefix = f.read(32)
if prefix == MutableShareFile.MAGIC:
# mutable share
m = MutableShareFile(abs_sharefile)
WE, nodeid = m._read_write_enabler_and_nodeid(f)
data_length = m._read_data_length(f)
expiration_time = min(
[lease.expiration_time for (i, lease) in m._enumerate_leases(f)])
expiration = max(0, expiration_time - now)
share_type = "unknown"
f.seek(m.DATA_OFFSET)
version = f.read(1)
if version == b"\x00":
# this slot contains an SMDF share
share_type = "SDMF"
elif version == b"\x01":
share_type = "MDMF"
if share_type == "SDMF":
f.seek(m.DATA_OFFSET)
data = f.read(min(data_length, 2000))
try:
pieces = unpack_share(data)
except NeedMoreDataError as e:
# retry once with the larger size
size = e.needed_bytes
f.seek(m.DATA_OFFSET)
data = f.read(min(data_length, size))
pieces = unpack_share(data)
(seqnum, root_hash, IV, k, N, segsize, datalen, pubkey, signature,
share_hash_chain, block_hash_tree, share_data,
enc_privkey) = pieces
print("SDMF %s %d/%d %d #%d:%s %d %s" % \
(si_s, k, N, datalen,
seqnum, unicode(base32.b2a(root_hash), "utf-8"),
expiration, quote_output(abs_sharefile)), file=out)
elif share_type == "MDMF":
from allmydata.mutable.layout import MDMFSlotReadProxy
fake_shnum = 0
# TODO: factor this out with dump_MDMF_share()
class ShareDumper(MDMFSlotReadProxy):
def _read(self, readvs, force_remote=False, queue=False):
data = []
for (where, length) in readvs:
f.seek(m.DATA_OFFSET + where)
data.append(f.read(length))
return defer.succeed({fake_shnum: data})
p = ShareDumper(None, "fake-si", fake_shnum)
def extract(func):
stash = []
# these methods return Deferreds, but we happen to know that
# they run synchronously when not actually talking to a
# remote server
d = func()
d.addCallback(stash.append)
return stash[0]
verinfo = extract(p.get_verinfo)
(seqnum, root_hash, salt_to_use, segsize, datalen, k, N, prefix,
offsets) = verinfo
print("MDMF %s %d/%d %d #%d:%s %d %s" % \
(si_s, k, N, datalen,
seqnum, unicode(base32.b2a(root_hash), "utf-8"),
expiration, quote_output(abs_sharefile)), file=out)
else:
print("UNKNOWN mutable %s" % quote_output(abs_sharefile), file=out)
elif struct.unpack(">L", prefix[:4]) == (1, ):
# immutable
class ImmediateReadBucketProxy(ReadBucketProxy):
def __init__(self, sf):
self.sf = sf
ReadBucketProxy.__init__(self, None, None, "")
def __repr__(self):
return "<ImmediateReadBucketProxy>"
def _read(self, offset, size):
return defer.succeed(sf.read_share_data(offset, size))
# use a ReadBucketProxy to parse the bucket and find the uri extension
sf = ShareFile(abs_sharefile)
bp = ImmediateReadBucketProxy(sf)
expiration_time = min(
[lease.expiration_time for lease in sf.get_leases()])
expiration = max(0, expiration_time - now)
UEB_data = call(bp.get_uri_extension)
unpacked = uri.unpack_extension_readable(UEB_data)
k = unpacked["needed_shares"]
N = unpacked["total_shares"]
filesize = unpacked["size"]
ueb_hash = unpacked["UEB_hash"]
print("CHK %s %d/%d %d %s %d %s" %
(si_s, k, N, filesize, unicode(
ueb_hash, "utf-8"), expiration, quote_output(abs_sharefile)),
file=out)
else:
print("UNKNOWN really-unknown %s" % quote_output(abs_sharefile),
file=out)
f.close()
def dump_immutable_chk_share(f, out, options):
from allmydata import uri
from allmydata.util import base32
from allmydata.immutable.layout import ReadBucketProxy
from allmydata.util.encodingutil import quote_output, to_bytes
# use a ReadBucketProxy to parse the bucket and find the uri extension
bp = ReadBucketProxy(None, None, '')
offsets = bp._parse_offsets(f.read_share_data(0, 0x44))
print("%20s: %d" % ("version", bp._version), file=out)
seek = offsets['uri_extension']
length = struct.unpack(bp._fieldstruct,
f.read_share_data(seek, bp._fieldsize))[0]
seek += bp._fieldsize
UEB_data = f.read_share_data(seek, length)
unpacked = uri.unpack_extension_readable(UEB_data)
keys1 = ("size", "num_segments", "segment_size", "needed_shares",
"total_shares")
keys2 = ("codec_name", "codec_params", "tail_codec_params")
keys3 = ("plaintext_hash", "plaintext_root_hash", "crypttext_hash",
"crypttext_root_hash", "share_root_hash", "UEB_hash")
display_keys = {"size": "file_size"}
def to_string(v):
if isinstance(v, bytes):
return unicode(v, "utf-8")
else:
return str(v)
for k in keys1:
if k in unpacked:
dk = display_keys.get(k, k)
print("%20s: %s" % (dk, to_string(unpacked[k])), file=out)
print(file=out)
for k in keys2:
if k in unpacked:
dk = display_keys.get(k, k)
print("%20s: %s" % (dk, to_string(unpacked[k])), file=out)
print(file=out)
for k in keys3:
if k in unpacked:
dk = display_keys.get(k, k)
print("%20s: %s" % (dk, to_string(unpacked[k])), file=out)
leftover = set(unpacked.keys()) - set(keys1 + keys2 + keys3)
if leftover:
print(file=out)
print("LEFTOVER:", file=out)
for k in sorted(leftover):
print("%20s: %s" % (k, to_string(unpacked[k])), file=out)
# the storage index isn't stored in the share itself, so we depend upon
# knowing the parent directory name to get it
pieces = options['filename'].split(os.sep)
if len(pieces) >= 2:
piece = to_bytes(pieces[-2])
if base32.could_be_base32_encoded(piece):
storage_index = base32.a2b(piece)
uri_extension_hash = base32.a2b(unpacked["UEB_hash"])
u = uri.CHKFileVerifierURI(storage_index, uri_extension_hash,
unpacked["needed_shares"],
unpacked["total_shares"],
unpacked["size"])
verify_cap = u.to_string()
print("%20s: %s" %
("verify-cap", quote_output(verify_cap, quotemarks=False)),
file=out)
sizes = {}
sizes['data'] = (offsets['plaintext_hash_tree'] - offsets['data'])
sizes['validation'] = (offsets['uri_extension'] -
offsets['plaintext_hash_tree'])
sizes['uri-extension'] = len(UEB_data)
print(file=out)
print(" Size of data within the share:", file=out)
for k in sorted(sizes):
print("%20s: %s" % (k, sizes[k]), file=out)
if options['offsets']:
print(file=out)
print(" Section Offsets:", file=out)
print("%20s: %s" % ("share data", f._data_offset), file=out)
for k in [
"data", "plaintext_hash_tree", "crypttext_hash_tree",
"block_hashes", "share_hashes", "uri_extension"
]:
name = {"data": "block data"}.get(k, k)
offset = f._data_offset + offsets[k]
print(" %20s: %s (0x%x)" % (name, offset, offset), file=out)
print("%20s: %s" % ("leases", f._lease_offset), file=out)
def dump_immutable_chk_share(f, out, options):
from allmydata import uri
from allmydata.util import base32
from allmydata.immutable.layout import ReadBucketProxy
from allmydata.util.encodingutil import quote_output, to_str
# use a ReadBucketProxy to parse the bucket and find the uri extension
bp = ReadBucketProxy(None, '', '')
offsets = bp._parse_offsets(f.read_share_data(0, 0x44))
print >>out, "%20s: %d" % ("version", bp._version)
seek = offsets['uri_extension']
length = struct.unpack(bp._fieldstruct,
f.read_share_data(seek, bp._fieldsize))[0]
seek += bp._fieldsize
UEB_data = f.read_share_data(seek, length)
unpacked = uri.unpack_extension_readable(UEB_data)
keys1 = ("size", "num_segments", "segment_size",
"needed_shares", "total_shares")
keys2 = ("codec_name", "codec_params", "tail_codec_params")
keys3 = ("plaintext_hash", "plaintext_root_hash",
"crypttext_hash", "crypttext_root_hash",
"share_root_hash", "UEB_hash")
display_keys = {"size": "file_size"}
for k in keys1:
if k in unpacked:
dk = display_keys.get(k, k)
print >>out, "%20s: %s" % (dk, unpacked[k])
print >>out
for k in keys2:
if k in unpacked:
dk = display_keys.get(k, k)
print >>out, "%20s: %s" % (dk, unpacked[k])
print >>out
for k in keys3:
if k in unpacked:
dk = display_keys.get(k, k)
print >>out, "%20s: %s" % (dk, unpacked[k])
leftover = set(unpacked.keys()) - set(keys1 + keys2 + keys3)
if leftover:
print >>out
print >>out, "LEFTOVER:"
for k in sorted(leftover):
print >>out, "%20s: %s" % (k, unpacked[k])
# the storage index isn't stored in the share itself, so we depend upon
# knowing the parent directory name to get it
pieces = options['filename'].split(os.sep)
if len(pieces) >= 2:
piece = to_str(pieces[-2])
if base32.could_be_base32_encoded(piece):
storage_index = base32.a2b(piece)
uri_extension_hash = base32.a2b(unpacked["UEB_hash"])
u = uri.CHKFileVerifierURI(storage_index, uri_extension_hash,
unpacked["needed_shares"],
unpacked["total_shares"], unpacked["size"])
verify_cap = u.to_string()
print >>out, "%20s: %s" % ("verify-cap", quote_output(verify_cap, quotemarks=False))
sizes = {}
sizes['data'] = (offsets['plaintext_hash_tree'] -
offsets['data'])
sizes['validation'] = (offsets['uri_extension'] -
offsets['plaintext_hash_tree'])
sizes['uri-extension'] = len(UEB_data)
print >>out
print >>out, " Size of data within the share:"
for k in sorted(sizes):
print >>out, "%20s: %s" % (k, sizes[k])
if options['offsets']:
print >>out
print >>out, " Section Offsets:"
print >>out, "%20s: %s" % ("share data", f._data_offset)
for k in ["data", "plaintext_hash_tree", "crypttext_hash_tree",
"block_hashes", "share_hashes", "uri_extension"]:
name = {"data": "block data"}.get(k,k)
offset = f._data_offset + offsets[k]
print >>out, " %20s: %s (0x%x)" % (name, offset, offset)
print >>out, "%20s: %s" % ("leases", f._lease_offset)
ReadBucketProxy.__init__(self, "", "", "")
def __repr__(self):
return "<ImmediateReadBucketProxy>"
def _read(self, offset, size):
return defer.succeed(sf.read_share_data(offset, size))
# use a ReadBucketProxy to parse the bucket and find the uri extension
sf = ShareFile(abs_sharefile)
bp = ImmediateReadBucketProxy(sf)
expiration_time = min( [lease.expiration_time
for lease in sf.get_leases()] )
expiration = max(0, expiration_time - now)
UEB_data = call(bp.get_uri_extension)
unpacked = uri.unpack_extension_readable(UEB_data)
k = unpacked["needed_shares"]
N = unpacked["total_shares"]
filesize = unpacked["size"]
ueb_hash = unpacked["UEB_hash"]
print >>out, "CHK %s %d/%d %d %s %d %s" % (si_s, k, N, filesize,
ueb_hash, expiration,
quote_output(abs_sharefile))
else:
print >>out, "UNKNOWN really-unknown %s" % quote_output(abs_sharefile)
f.close()
ReadBucketProxy.__init__(self, None, None, "")
def __repr__(self):
return "<ImmediateReadBucketProxy>"
def _read(self, offset, size):
return defer.succeed(sf.read_share_data(offset, size))
# use a ReadBucketProxy to parse the bucket and find the uri extension
sf = ShareFile(abs_sharefile)
bp = ImmediateReadBucketProxy(sf)
expiration_time = min( [lease.expiration_time
for lease in sf.get_leases()] )
expiration = max(0, expiration_time - now)
UEB_data = call(bp.get_uri_extension)
unpacked = uri.unpack_extension_readable(UEB_data)
k = unpacked["needed_shares"]
N = unpacked["total_shares"]
filesize = unpacked["size"]
ueb_hash = unpacked["UEB_hash"]
print >>out, "CHK %s %d/%d %d %s %d %s" % (si_s, k, N, filesize,
ueb_hash, expiration,
quote_output(abs_sharefile))
else:
print >>out, "UNKNOWN really-unknown %s" % quote_output(abs_sharefile)
f.close()
def describe_share(abs_sharefile, si_s, shnum_s, now, out):
from allmydata import uri
from allmydata.storage.mutable import MutableShareFile
from allmydata.storage.immutable import ShareFile
from allmydata.mutable.layout import unpack_share
from allmydata.mutable.common import NeedMoreDataError
from allmydata.immutable.layout import ReadBucketProxy
from allmydata.util import base32
from allmydata.util.encodingutil import quote_output
import struct
f = open(abs_sharefile, "rb")
prefix = f.read(32)
if prefix == MutableShareFile.MAGIC:
# mutable share
m = MutableShareFile(abs_sharefile)
WE, nodeid = m._read_write_enabler_and_nodeid(f)
data_length = m._read_data_length(f)
expiration_time = min( [lease.expiration_time
for (i,lease) in m._enumerate_leases(f)] )
expiration = max(0, expiration_time - now)
share_type = "unknown"
f.seek(m.DATA_OFFSET)
version = f.read(1)
if version == "\x00":
# this slot contains an SMDF share
share_type = "SDMF"
elif version == "\x01":
share_type = "MDMF"
if share_type == "SDMF":
f.seek(m.DATA_OFFSET)
data = f.read(min(data_length, 2000))
try:
pieces = unpack_share(data)
except NeedMoreDataError as e:
# retry once with the larger size
size = e.needed_bytes
f.seek(m.DATA_OFFSET)
data = f.read(min(data_length, size))
pieces = unpack_share(data)
(seqnum, root_hash, IV, k, N, segsize, datalen,
pubkey, signature, share_hash_chain, block_hash_tree,
share_data, enc_privkey) = pieces
print("SDMF %s %d/%d %d #%d:%s %d %s" % \
(si_s, k, N, datalen,
seqnum, base32.b2a(root_hash),
expiration, quote_output(abs_sharefile)), file=out)
elif share_type == "MDMF":
from allmydata.mutable.layout import MDMFSlotReadProxy
fake_shnum = 0
# TODO: factor this out with dump_MDMF_share()
class ShareDumper(MDMFSlotReadProxy):
def _read(self, readvs, force_remote=False, queue=False):
data = []
for (where,length) in readvs:
f.seek(m.DATA_OFFSET+where)
data.append(f.read(length))
return defer.succeed({fake_shnum: data})
p = ShareDumper(None, "fake-si", fake_shnum)
def extract(func):
stash = []
# these methods return Deferreds, but we happen to know that
# they run synchronously when not actually talking to a
# remote server
d = func()
d.addCallback(stash.append)
return stash[0]
verinfo = extract(p.get_verinfo)
(seqnum, root_hash, salt_to_use, segsize, datalen, k, N, prefix,
offsets) = verinfo
print("MDMF %s %d/%d %d #%d:%s %d %s" % \
(si_s, k, N, datalen,
seqnum, base32.b2a(root_hash),
expiration, quote_output(abs_sharefile)), file=out)
else:
print("UNKNOWN mutable %s" % quote_output(abs_sharefile), file=out)
elif struct.unpack(">L", prefix[:4]) == (1,):
# immutable
class ImmediateReadBucketProxy(ReadBucketProxy):
def __init__(self, sf):
self.sf = sf
ReadBucketProxy.__init__(self, None, None, "")
def __repr__(self):
return "<ImmediateReadBucketProxy>"
def _read(self, offset, size):
return defer.succeed(sf.read_share_data(offset, size))
# use a ReadBucketProxy to parse the bucket and find the uri extension
sf = ShareFile(abs_sharefile)
bp = ImmediateReadBucketProxy(sf)
expiration_time = min( [lease.expiration_time
for lease in sf.get_leases()] )
expiration = max(0, expiration_time - now)
UEB_data = call(bp.get_uri_extension)
unpacked = uri.unpack_extension_readable(UEB_data)
k = unpacked["needed_shares"]
N = unpacked["total_shares"]
filesize = unpacked["size"]
ueb_hash = unpacked["UEB_hash"]
print("CHK %s %d/%d %d %s %d %s" % (si_s, k, N, filesize,
ueb_hash, expiration,
quote_output(abs_sharefile)), file=out)
else:
print("UNKNOWN really-unknown %s" % quote_output(abs_sharefile), file=out)
f.close()
