3 import cStringIO, os, random, re
12 from pyutil import fileutil
14 from base64 import b32encode
15 def ab(x): # debuggery
17 return "%s:%s" % (len(x), b32encode(x[-3:]),)
19 return "%s:%s" % (len(x), b32encode(x[-2:]),)
21 return "%s:%s" % (len(x), b32encode(x[-1:]),)
23 return "%s:%s" % (len(x), "--empty--",)
26 return ''.join(map(chr, map(random.randrange, [0]*n, [256]*n)))
29 encer = zfec.Encoder(k, m)
30 nums_and_blocks = list(enumerate(encer.encode(ss)))
31 assert isinstance(nums_and_blocks, list), nums_and_blocks
32 assert len(nums_and_blocks) == m, (len(nums_and_blocks), m,)
33 nums_and_blocks = random.sample(nums_and_blocks, k)
34 blocks = [ x[1] for x in nums_and_blocks ]
35 nums = [ x[0] for x in nums_and_blocks ]
36 decer = zfec.Decoder(k, m)
37 decoded = decer.decode(blocks, nums)
38 assert len(decoded) == len(ss), (len(decoded), len(ss),)
39 assert tuple([str(s) for s in decoded]) == tuple([str(s) for s in ss]), (tuple([ab(str(s)) for s in decoded]), tuple([ab(str(s)) for s in ss]),)
41 def _help_test_random():
42 m = random.randrange(1, 257)
43 k = random.randrange(1, m+1)
44 l = random.randrange(0, 2**9)
45 ss = [ randstr(l/k) for x in range(k) ]
48 def _help_test_random_with_l(l):
49 m = random.randrange(1, 257)
50 k = random.randrange(1, m+1)
51 ss = [ randstr(l/k) for x in range(k) ]
55 encer = zfec.easyfec.Encoder(k, m)
56 nums_and_blocks = list(enumerate(encer.encode(s)))
57 assert isinstance(nums_and_blocks, list), nums_and_blocks
58 assert len(nums_and_blocks) == m, (len(nums_and_blocks), m,)
59 nums_and_blocks = random.sample(nums_and_blocks, k)
60 blocks = [ x[1] for x in nums_and_blocks ]
61 nums = [ x[0] for x in nums_and_blocks ]
62 decer = zfec.easyfec.Decoder(k, m)
64 decodeds = decer.decode(blocks, nums, padlen=k*len(blocks[0]) - len(s))
65 assert len(decodeds) == len(s), (ab(decodeds), ab(s), k, m)
66 assert decodeds == s, (ab(decodeds), ab(s),)
68 def _help_test_random_easy():
69 m = random.randrange(1, 257)
70 k = random.randrange(1, m+1)
71 l = random.randrange(0, 2**9)
75 def _help_test_random_with_l_easy(l):
76 m = random.randrange(1, 257)
77 k = random.randrange(1, m+1)
81 class ZFecTest(unittest.TestCase):
84 _help_test_random_with_l(i)
86 print "%d randomized tests pass." % (i+1)
88 def test_random(self):
92 print "%d randomized tests pass." % (i+1)
94 def test_bad_args_dec(self):
95 decer = zfec.Decoder(2, 4)
98 decer.decode(98, []) # first argument is not a sequence
100 assert "First argument was not a sequence" in str(e), e
102 raise "Should have gotten TypeError for wrong type of second argument."
105 decer.decode(["a", "b", ], ["c", "d",])
106 except zfec.Error, e:
107 assert "Precondition violation: second argument is required to contain int" in str(e), e
109 raise "Should have gotten zfec.Error for wrong type of second argument."
112 decer.decode(["a", "b", ], 98) # not a sequence at all
114 assert "Second argument was not a sequence" in str(e), e
116 raise "Should have gotten TypeError for wrong type of second argument."
118 class EasyFecTest(unittest.TestCase):
119 def test_small(self):
121 _help_test_random_with_l_easy(i)
123 print "%d randomized tests pass." % (i+1)
125 def test_random(self):
127 _help_test_random_easy()
129 print "%d randomized tests pass." % (i+1)
131 def test_bad_args_dec(self):
132 decer = zfec.easyfec.Decoder(2, 4)
135 decer.decode(98, [0, 1], 0) # first argument is not a sequence
137 assert "First argument was not a sequence" in str(e), e
139 raise "Should have gotten TypeError for wrong type of second argument."
142 decer.decode("ab", ["c", "d",], 0)
143 except zfec.Error, e:
144 assert "Precondition violation: second argument is required to contain int" in str(e), e
146 raise "Should have gotten zfec.Error for wrong type of second argument."
149 decer.decode("ab", 98, 0) # not a sequence at all
151 assert "Second argument was not a sequence" in str(e), e
153 raise "Should have gotten TypeError for wrong type of second argument."
155 class FileFec(unittest.TestCase):
156 def test_filefec_header(self):
157 for m in [1, 2, 3, 5, 7, 9, 11, 17, 19, 33, 35, 65, 66, 67, 129, 130, 131, 254, 255, 256,]:
158 for k in [1, 2, 3, 5, 9, 17, 33, 65, 129, 255, 256,]:
161 for pad in [0, 1, k-1,]:
164 for sh in [0, 1, m-1,]:
167 h = zfec.filefec._build_header(m, k, pad, sh)
168 hio = cStringIO.StringIO(h)
169 (rm, rk, rpad, rsh,) = zfec.filefec._parse_header(hio)
170 assert (rm, rk, rpad, rsh,) == (m, k, pad, sh,), h
172 def _help_test_filefec(self, teststr, k, m, numshs=None):
176 TESTFNAME = "testfile.txt"
182 tempdir = fileutil.NamedTemporaryDirectory(cleanup=True)
184 tempf = tempdir.file(TESTFNAME, 'w+b')
190 zfec.filefec.encode_to_files(tempf, fsize, tempdir.name, PREFIX, k, m, SUFFIX, verbose=VERBOSE)
192 # select some share files
193 RE=re.compile(zfec.filefec.RE_FORMAT % (PREFIX, SUFFIX,))
194 fns = os.listdir(tempdir.name)
195 assert len(fns) >= m, (fns, tempdir, tempdir.name,)
196 sharefs = [ open(os.path.join(tempdir.name, fn), "rb") for fn in fns if RE.match(fn) ]
197 for sharef in sharefs:
198 tempdir.register_file(sharef)
199 random.shuffle(sharefs)
202 # decode from the share files
203 outf = tempdir.file('recovered-testfile.txt', 'w+b')
204 zfec.filefec.decode_from_files(outf, sharefs, verbose=VERBOSE)
207 recovereddata = outf.read()
208 assert recovereddata == teststr, (ab(recovereddata), ab(teststr),)
212 def test_filefec_all_shares(self):
213 return self._help_test_filefec("Yellow Whirled!", 3, 8)
215 def test_filefec_all_shares_1_b(self):
216 return self._help_test_filefec("Yellow Whirled!", 4, 16)
218 def test_filefec_all_shares_2(self):
219 return self._help_test_filefec("Yellow Whirled", 3, 8)
221 def test_filefec_all_shares_2_b(self):
222 return self._help_test_filefec("Yellow Whirled", 4, 16)
224 def test_filefec_all_shares_3(self):
225 return self._help_test_filefec("Yellow Whirle", 3, 8)
227 def test_filefec_all_shares_3_b(self):
228 return self._help_test_filefec("Yellow Whirle", 4, 16)
230 def test_filefec_all_shares_with_padding(self, noisy=VERBOSE):
231 return self._help_test_filefec("Yellow Whirled!A", 3, 8)
233 def test_filefec_min_shares_with_padding(self, noisy=VERBOSE):
234 return self._help_test_filefec("Yellow Whirled!A", 3, 8, numshs=3)
236 def test_filefec_min_shares_with_crlf(self, noisy=VERBOSE):
237 return self._help_test_filefec("llow Whirled!A\r\n", 3, 8, numshs=3)
239 def test_filefec_min_shares_with_lf(self, noisy=VERBOSE):
240 return self._help_test_filefec("Yellow Whirled!A\n", 3, 8, numshs=3)
242 def test_filefec_min_shares_with_lflf(self, noisy=VERBOSE):
243 return self._help_test_filefec("Yellow Whirled!A\n\n", 3, 8, numshs=3)
245 def test_filefec_min_shares_with_crcrlflf(self, noisy=VERBOSE):
246 return self._help_test_filefec("Yellow Whirled!A\r\r\n\n", 3, 8, numshs=3)
249 class Cmdline(unittest.TestCase):
250 def test_basic(self, noisy=VERBOSE):
251 tempdir = fileutil.NamedTemporaryDirectory(cleanup=True)
252 fo = tempdir.file("test.data", "w+b")
253 fo.write("WHEHWHJEKWAHDLJAWDHWALKDHA")
260 sys.argv = ["zfec", os.path.join(tempdir.name, "test.data"),]
262 retcode = zfec.cmdline_zfec.main()
263 assert retcode == 0, retcode
265 RE=re.compile(zfec.filefec.RE_FORMAT % ('test.data', ".fec",))
266 fns = os.listdir(tempdir.name)
267 assert len(fns) >= DEFAULT_M, (fns, DEFAULT_M, tempdir, tempdir.name,)
268 sharefns = [ os.path.join(tempdir.name, fn) for fn in fns if RE.match(fn) ]
269 random.shuffle(sharefns)
270 del sharefns[DEFAULT_K:]
272 sys.argv = ["zunfec",]
273 sys.argv.extend(sharefns)
274 sys.argv.extend(['-o', os.path.join(tempdir.name, 'test.data-recovered'),])
276 retcode = zfec.cmdline_zunfec.main()
277 assert retcode == 0, retcode
279 assert filecmp.cmp(os.path.join(tempdir.name, 'test.data'), os.path.join(tempdir.name, 'test.data-recovered'))
283 if __name__ == "__main__":
286 # zfec -- fast forward error correction library with Python interface
288 # Copyright (C) 2007 Allmydata, Inc.
289 # Author: Zooko Wilcox-O'Hearn
291 # This file is part of zfec.
293 # See README.txt for licensing information.