--- /dev/null
+#!/usr/bin/env python
+
+import cStringIO, os, random, re
+
+import unittest
+
+global VERBOSE
+VERBOSE=False
+
+import zfec
+
+from pyutil import fileutil
+
+from base64 import b32encode
+def ab(x): # debuggery
+ if len(x) >= 3:
+ return "%s:%s" % (len(x), b32encode(x[-3:]),)
+ elif len(x) == 2:
+ return "%s:%s" % (len(x), b32encode(x[-2:]),)
+ elif len(x) == 1:
+ return "%s:%s" % (len(x), b32encode(x[-1:]),)
+ elif len(x) == 0:
+ return "%s:%s" % (len(x), "--empty--",)
+
+def randstr(n):
+ return ''.join(map(chr, map(random.randrange, [0]*n, [256]*n)))
+
+def _h(k, m, ss):
+ encer = zfec.Encoder(k, m)
+ nums_and_blocks = list(enumerate(encer.encode(ss)))
+ assert isinstance(nums_and_blocks, list), nums_and_blocks
+ assert len(nums_and_blocks) == m, (len(nums_and_blocks), m,)
+ nums_and_blocks = random.sample(nums_and_blocks, k)
+ blocks = [ x[1] for x in nums_and_blocks ]
+ nums = [ x[0] for x in nums_and_blocks ]
+ decer = zfec.Decoder(k, m)
+ decoded = decer.decode(blocks, nums)
+ assert len(decoded) == len(ss), (len(decoded), len(ss),)
+ 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]),)
+
+def _help_test_random():
+ m = random.randrange(1, 257)
+ k = random.randrange(1, m+1)
+ l = random.randrange(0, 2**9)
+ ss = [ randstr(l/k) for x in range(k) ]
+ _h(k, m, ss)
+
+def _help_test_random_with_l(l):
+ m = random.randrange(1, 257)
+ k = random.randrange(1, m+1)
+ ss = [ randstr(l/k) for x in range(k) ]
+ _h(k, m, ss)
+
+def _h_easy(k, m, s):
+ encer = zfec.easyfec.Encoder(k, m)
+ nums_and_blocks = list(enumerate(encer.encode(s)))
+ assert isinstance(nums_and_blocks, list), nums_and_blocks
+ assert len(nums_and_blocks) == m, (len(nums_and_blocks), m,)
+ nums_and_blocks = random.sample(nums_and_blocks, k)
+ blocks = [ x[1] for x in nums_and_blocks ]
+ nums = [ x[0] for x in nums_and_blocks ]
+ decer = zfec.easyfec.Decoder(k, m)
+
+ decodeds = decer.decode(blocks, nums, padlen=k*len(blocks[0]) - len(s))
+ assert len(decodeds) == len(s), (ab(decodeds), ab(s), k, m)
+ assert decodeds == s, (ab(decodeds), ab(s),)
+
+def _help_test_random_easy():
+ m = random.randrange(1, 257)
+ k = random.randrange(1, m+1)
+ l = random.randrange(0, 2**9)
+ s = randstr(l)
+ _h_easy(k, m, s)
+
+def _help_test_random_with_l_easy(l):
+ m = random.randrange(1, 257)
+ k = random.randrange(1, m+1)
+ s = randstr(l)
+ _h_easy(k, m, s)
+
+class ZFecTest(unittest.TestCase):
+ def test_instantiate_encoder_no_args(self):
+ try:
+ e = zfec.Encoder()
+ except TypeError:
+ # Okay, so that's because we're required to pass constructor args.
+ pass
+ else:
+ # Oops, it should have raised an exception.
+ self.fail("Should have raised exception from incorrect arguments to constructor.")
+
+ def test_instantiate_decoder_no_args(self):
+ try:
+ e = zfec.Decoder()
+ except TypeError:
+ # Okay, so that's because we're required to pass constructor args.
+ pass
+ else:
+ # Oops, it should have raised an exception.
+ self.fail("Should have raised exception from incorrect arguments to constructor.")
+
+ def test_from_agl_c(self):
+ self.failUnless(zfec._fec.test_from_agl())
+
+ def test_from_agl_py(self):
+ e = zfec.Encoder(3, 5)
+ b0 = '\x01'*8 ; b1 = '\x02'*8 ; b2 = '\x03'*8
+ # print "_from_py before encoding:"
+ # print "b0: %s, b1: %s, b2: %s" % tuple(base64.b16encode(x) for x in [b0, b1, b2])
+
+ b3, b4 = e.encode([b0, b1, b2], (3, 4))
+ # print "after encoding:"
+ # print "b3: %s, b4: %s" % tuple(base64.b16encode(x) for x in [b3, b4])
+
+ d = zfec.Decoder(3, 5)
+ r0, r1, r2 = d.decode((b2, b3, b4), (1, 2, 3))
+
+ # print "after decoding:"
+ # print "b0: %s, b1: %s" % tuple(base64.b16encode(x) for x in [b0, b1])
+
+ def test_small(self):
+ for i in range(16):
+ _help_test_random_with_l(i)
+ if VERBOSE:
+ print "%d randomized tests pass." % (i+1)
+
+ def test_random(self):
+ for i in range(3):
+ _help_test_random()
+ if VERBOSE:
+ print "%d randomized tests pass." % (i+1)
+
+ def test_bad_args_construct_decoder(self):
+ try:
+ zfec.Decoder(-1, -1)
+ except zfec.Error, e:
+ assert "argument is required to be greater than or equal to 1" in str(e), e
+ else:
+ self.fail("Should have gotten an exception from out-of-range arguments.")
+
+ try:
+ zfec.Decoder(1, 257)
+ except zfec.Error, e:
+ assert "argument is required to be less than or equal to 256" in str(e), e
+ else:
+ self.fail("Should have gotten an exception from out-of-range arguments.")
+
+ try:
+ zfec.Decoder(3, 2)
+ except zfec.Error, e:
+ assert "first argument is required to be less than or equal to the second argument" in str(e), e
+ else:
+ self.fail("Should have gotten an exception from out-of-range arguments.")
+
+ def test_bad_args_construct_encoder(self):
+ try:
+ zfec.Encoder(-1, -1)
+ except zfec.Error, e:
+ assert "argument is required to be greater than or equal to 1" in str(e), e
+ else:
+ self.fail("Should have gotten an exception from out-of-range arguments.")
+
+ try:
+ zfec.Encoder(1, 257)
+ except zfec.Error, e:
+ assert "argument is required to be less than or equal to 256" in str(e), e
+ else:
+ self.fail("Should have gotten an exception from out-of-range arguments.")
+
+ def test_bad_args_dec(self):
+ decer = zfec.Decoder(2, 4)
+
+ try:
+ decer.decode(98, []) # first argument is not a sequence
+ except TypeError, e:
+ assert "First argument was not a sequence" in str(e), e
+ else:
+ self.fail("Should have gotten TypeError for wrong type of second argument.")
+
+ try:
+ decer.decode(["a", "b", ], ["c", "d",])
+ except zfec.Error, e:
+ assert "Precondition violation: second argument is required to contain int" in str(e), e
+ else:
+ self.fail("Should have gotten zfec.Error for wrong type of second argument.")
+
+ try:
+ decer.decode(["a", "b", ], 98) # not a sequence at all
+ except TypeError, e:
+ assert "Second argument was not a sequence" in str(e), e
+ else:
+ self.fail("Should have gotten TypeError for wrong type of second argument.")
+
+class EasyFecTest(unittest.TestCase):
+ def test_small(self):
+ for i in range(16):
+ _help_test_random_with_l_easy(i)
+ if VERBOSE:
+ print "%d randomized tests pass." % (i+1)
+
+ def test_random(self):
+ for i in range(3):
+ _help_test_random_easy()
+ if VERBOSE:
+ print "%d randomized tests pass." % (i+1)
+
+ def test_bad_args_dec(self):
+ decer = zfec.easyfec.Decoder(2, 4)
+
+ try:
+ decer.decode(98, [0, 1], 0) # first argument is not a sequence
+ except TypeError, e:
+ assert "First argument was not a sequence" in str(e), e
+ else:
+ self.fail("Should have gotten TypeError for wrong type of second argument.")
+
+ try:
+ decer.decode("ab", ["c", "d",], 0)
+ except zfec.Error, e:
+ assert "Precondition violation: second argument is required to contain int" in str(e), e
+ else:
+ self.fail("Should have gotten zfec.Error for wrong type of second argument.")
+
+ try:
+ decer.decode("ab", 98, 0) # not a sequence at all
+ except TypeError, e:
+ assert "Second argument was not a sequence" in str(e), e
+ else:
+ self.fail("Should have gotten TypeError for wrong type of second argument.")
+
+class FileFec(unittest.TestCase):
+ def test_filefec_header(self):
+ for m in [1, 2, 3, 5, 7, 9, 11, 17, 19, 33, 35, 65, 66, 67, 129, 130, 131, 254, 255, 256,]:
+ for k in [1, 2, 3, 5, 9, 17, 33, 65, 129, 255, 256,]:
+ if k >= m:
+ continue
+ for pad in [0, 1, k-1,]:
+ if pad >= k:
+ continue
+ for sh in [0, 1, m-1,]:
+ if sh >= m:
+ continue
+ h = zfec.filefec._build_header(m, k, pad, sh)
+ hio = cStringIO.StringIO(h)
+ (rm, rk, rpad, rsh,) = zfec.filefec._parse_header(hio)
+ assert (rm, rk, rpad, rsh,) == (m, k, pad, sh,), h
+
+ def _help_test_filefec(self, teststr, k, m, numshs=None):
+ if numshs == None:
+ numshs = m
+
+ TESTFNAME = "testfile.txt"
+ PREFIX = "test"
+ SUFFIX = ".fec"
+
+ fsize = len(teststr)
+
+ tempdir = fileutil.NamedTemporaryDirectory(cleanup=True)
+ try:
+ tempf = tempdir.file(TESTFNAME, 'w+b')
+ tempf.write(teststr)
+ tempf.flush()
+ tempf.seek(0)
+
+ # encode the file
+ zfec.filefec.encode_to_files(tempf, fsize, tempdir.name, PREFIX, k, m, SUFFIX, verbose=VERBOSE)
+
+ # select some share files
+ RE=re.compile(zfec.filefec.RE_FORMAT % (PREFIX, SUFFIX,))
+ fns = os.listdir(tempdir.name)
+ assert len(fns) >= m, (fns, tempdir, tempdir.name,)
+ sharefs = [ open(os.path.join(tempdir.name, fn), "rb") for fn in fns if RE.match(fn) ]
+ for sharef in sharefs:
+ tempdir.register_file(sharef)
+ random.shuffle(sharefs)
+ del sharefs[numshs:]
+
+ # decode from the share files
+ outf = tempdir.file('recovered-testfile.txt', 'w+b')
+ zfec.filefec.decode_from_files(outf, sharefs, verbose=VERBOSE)
+ outf.flush()
+ outf.seek(0)
+ recovereddata = outf.read()
+ assert recovereddata == teststr, (ab(recovereddata), ab(teststr),)
+ finally:
+ tempdir.shutdown()
+
+ def test_filefec_all_shares(self):
+ return self._help_test_filefec("Yellow Whirled!", 3, 8)
+
+ def test_filefec_all_shares_1_b(self):
+ return self._help_test_filefec("Yellow Whirled!", 4, 16)
+
+ def test_filefec_all_shares_2(self):
+ return self._help_test_filefec("Yellow Whirled", 3, 8)
+
+ def test_filefec_all_shares_2_b(self):
+ return self._help_test_filefec("Yellow Whirled", 4, 16)
+
+ def test_filefec_all_shares_3(self):
+ return self._help_test_filefec("Yellow Whirle", 3, 8)
+
+ def test_filefec_all_shares_3_b(self):
+ return self._help_test_filefec("Yellow Whirle", 4, 16)
+
+ def test_filefec_all_shares_with_padding(self, noisy=VERBOSE):
+ return self._help_test_filefec("Yellow Whirled!A", 3, 8)
+
+ def test_filefec_min_shares_with_padding(self, noisy=VERBOSE):
+ return self._help_test_filefec("Yellow Whirled!A", 3, 8, numshs=3)
+
+ def test_filefec_min_shares_with_crlf(self, noisy=VERBOSE):
+ return self._help_test_filefec("llow Whirled!A\r\n", 3, 8, numshs=3)
+
+ def test_filefec_min_shares_with_lf(self, noisy=VERBOSE):
+ return self._help_test_filefec("Yellow Whirled!A\n", 3, 8, numshs=3)
+
+ def test_filefec_min_shares_with_lflf(self, noisy=VERBOSE):
+ return self._help_test_filefec("Yellow Whirled!A\n\n", 3, 8, numshs=3)
+
+ def test_filefec_min_shares_with_crcrlflf(self, noisy=VERBOSE):
+ return self._help_test_filefec("Yellow Whirled!A\r\r\n\n", 3, 8, numshs=3)
+
+
+class Cmdline(unittest.TestCase):
+ def test_basic(self, noisy=VERBOSE):
+ tempdir = fileutil.NamedTemporaryDirectory(cleanup=True)
+ fo = tempdir.file("test.data", "w+b")
+ fo.write("WHEHWHJEKWAHDLJAWDHWALKDHA")
+
+ import sys
+ realargv = sys.argv
+ try:
+ DEFAULT_M=8
+ DEFAULT_K=3
+ sys.argv = ["zfec", os.path.join(tempdir.name, "test.data"),]
+
+ retcode = zfec.cmdline_zfec.main()
+ assert retcode == 0, retcode
+
+ RE=re.compile(zfec.filefec.RE_FORMAT % ('test.data', ".fec",))
+ fns = os.listdir(tempdir.name)
+ assert len(fns) >= DEFAULT_M, (fns, DEFAULT_M, tempdir, tempdir.name,)
+ sharefns = [ os.path.join(tempdir.name, fn) for fn in fns if RE.match(fn) ]
+ random.shuffle(sharefns)
+ del sharefns[DEFAULT_K:]
+
+ sys.argv = ["zunfec",]
+ sys.argv.extend(sharefns)
+ sys.argv.extend(['-o', os.path.join(tempdir.name, 'test.data-recovered'),])
+
+ retcode = zfec.cmdline_zunfec.main()
+ assert retcode == 0, retcode
+ import filecmp
+ assert filecmp.cmp(os.path.join(tempdir.name, 'test.data'), os.path.join(tempdir.name, 'test.data-recovered'))
+ finally:
+ sys.argv = realargv
+
+if __name__ == "__main__":
+ unittest.main()
projects / tahoe-lafs / zfec.git / blobdiff