ExternalVendorCode/tahoe-lafs
1
0
Fork 0
mirror of https://github.com/tahoe-lafs/tahoe-lafs.git synced 2025-01-31 08:25:35 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

storage: test that the storage server ignores requests to extend shares by sending a new_length, and that the storage server fills exposed holes with 0 to avoid "palimpsest" exposure of previous contents

Browse Source 
ref. #1528
This commit is contained in:
Zooko O'Whielacronx 2011-09-12 15:25:54 -07:00
parent 20e2910c61
commit 942c5e5162
1 changed files with 66 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

73
src/allmydata/test/test_storage.py
View File

@ -837,22 +837,81 @@ class MutableServer(unittest.TestCase):
[])
self.failUnlessEqual(answer, (True, {0:[],1:[],2:[]}) )
# trying to make the container too large will raise an exception
# Trying to make the container too large (by sending a write vector
# whose offset is too high) will raise an exception.
TOOBIG = MutableShareFile.MAX_SIZE + 10
self.failUnlessRaises(DataTooLargeError,
rstaraw, "si1", secrets,
{0: ([], [(0,data)], TOOBIG)},
{0: ([], [(TOOBIG,data)], None)},
[])
# it should be possible to make the container smaller, although at
# the moment this doesn't actually affect the share, unless the
# container size is dropped to zero, in which case the share is
# deleted.
answer = rstaraw("si1", secrets,
{0: ([], [(0,data)], len(data)+8)},
{0: ([], [(0,data)], None)},
[])
self.failUnlessEqual(answer, (True, {0:[],1:[],2:[]}) )
read_answer = read("si1", [0], [(0,10)])
self.failUnlessEqual(read_answer, {0: [data[:10]]})
# Sending a new_length shorter than the current length truncates the
# data.
answer = rstaraw("si1", secrets,
{0: ([], [], 9)},
[])
read_answer = read("si1", [0], [(0,10)])
self.failUnlessEqual(read_answer, {0: [data[:9]]})
# Sending a new_length longer than the current length doesn't change
# the data.
answer = rstaraw("si1", secrets,
{0: ([], [], 20)},
[])
assert answer == (True, {0:[],1:[],2:[]})
read_answer = read("si1", [0], [(0, 20)])
self.failUnlessEqual(read_answer, {0: [data[:9]]})
# Sending a write vector whose start is after the end of the current
# data doesn't reveal "whatever was there last time" (palimpsest),
# but instead fills with zeroes.
# To test this, we fill the data area with a recognizable pattern.
pattern = ''.join([chr(i) for i in range(100)])
answer = rstaraw("si1", secrets,
{0: ([], [(0, pattern)], None)},
[])
assert answer == (True, {0:[],1:[],2:[]})
# Then truncate the data...
answer = rstaraw("si1", secrets,
{0: ([], [], 20)},
[])
assert answer == (True, {0:[],1:[],2:[]})
# Just confirm that you get an empty string if you try to read from
# past the (new) endpoint now.
answer = rstaraw("si1", secrets,
{0: ([], [], None)},
[(20, 1980)])
self.failUnlessEqual(answer, (True, {0:[''],1:[''],2:['']}))
# Then the extend the file by writing a vector which starts out past
# the end...
answer = rstaraw("si1", secrets,
{0: ([], [(50, 'hellothere')], None)},
[])
assert answer == (True, {0:[],1:[],2:[]})
# Now if you read the stuff between 20 (where we earlier truncated)
# and 50, it had better be all zeroes.
answer = rstaraw("si1", secrets,
{0: ([], [], None)},
[(20, 30)])
self.failUnlessEqual(answer, (True, {0:['\x00'*30],1:[''],2:['']}))
# Also see if the server explicitly declares that it supports this
# feature.
ver = ss.remote_get_version()
storage_v1_ver = ver["http://allmydata.org/tahoe/protocols/storage/v1"]
self.failUnless(storage_v1_ver.get("fills-holes-with-zero-bytes"))
# If the size is dropped to zero the share is deleted.
answer = rstaraw("si1", secrets,
{0: ([], [(0,data)], 0)},
[])