import os, shutil from cStringIO import StringIO from twisted.trial import unittest from twisted.python.failure import Failure from twisted.python import log from twisted.internet import defer from foolscap.api import fireEventually import allmydata # for __full_version__ from allmydata import uri, monitor, client from allmydata.immutable import upload, encode from allmydata.interfaces import FileTooLargeError, NoSharesError, \ NotEnoughSharesError from allmydata.util.assertutil import precondition from allmydata.util.deferredutil import DeferredListShouldSucceed from no_network import GridTestMixin from common_util import ShouldFailMixin from allmydata.storage_client import StorageFarmBroker from allmydata.storage.server import storage_index_to_dir MiB = 1024*1024 def extract_uri(results): return results.uri # Some of these took longer than 480 seconds on Zandr's arm box, but this may # have been due to an earlier test ERROR'ing out due to timeout, which seems # to screw up subsequent tests. timeout = 960 class Uploadable(unittest.TestCase): def shouldEqual(self, data, expected): self.failUnless(isinstance(data, list)) for e in data: self.failUnless(isinstance(e, str)) s = "".join(data) self.failUnlessEqual(s, expected) def test_filehandle_random_key(self): return self._test_filehandle(convergence=None) def test_filehandle_convergent_encryption(self): return self._test_filehandle(convergence="some convergence string") def _test_filehandle(self, convergence): s = StringIO("a"*41) u = upload.FileHandle(s, convergence=convergence) d = u.get_size() d.addCallback(self.failUnlessEqual, 41) d.addCallback(lambda res: u.read(1)) d.addCallback(self.shouldEqual, "a") d.addCallback(lambda res: u.read(80)) d.addCallback(self.shouldEqual, "a"*40) d.addCallback(lambda res: u.close()) # this doesn't close the filehandle d.addCallback(lambda res: s.close()) # that privilege is reserved for us return d def test_filename(self): basedir = "upload/Uploadable/test_filename" os.makedirs(basedir) fn = os.path.join(basedir, "file") f = open(fn, "w") f.write("a"*41) f.close() u = upload.FileName(fn, convergence=None) d = u.get_size() d.addCallback(self.failUnlessEqual, 41) d.addCallback(lambda res: u.read(1)) d.addCallback(self.shouldEqual, "a") d.addCallback(lambda res: u.read(80)) d.addCallback(self.shouldEqual, "a"*40) d.addCallback(lambda res: u.close()) return d def test_data(self): s = "a"*41 u = upload.Data(s, convergence=None) d = u.get_size() d.addCallback(self.failUnlessEqual, 41) d.addCallback(lambda res: u.read(1)) d.addCallback(self.shouldEqual, "a") d.addCallback(lambda res: u.read(80)) d.addCallback(self.shouldEqual, "a"*40) d.addCallback(lambda res: u.close()) return d class ServerError(Exception): pass class SetDEPMixin: def set_encoding_parameters(self, k, happy, n, max_segsize=1*MiB): p = {"k": k, "happy": happy, "n": n, "max_segment_size": max_segsize, } self.node.DEFAULT_ENCODING_PARAMETERS = p class FakeStorageServer: def __init__(self, mode): self.mode = mode self.allocated = [] self.queries = 0 self.version = { "http://allmydata.org/tahoe/protocols/storage/v1" : { "maximum-immutable-share-size": 2**32 }, "application-version": str(allmydata.__full_version__), } if mode == "small": self.version = { "http://allmydata.org/tahoe/protocols/storage/v1" : { "maximum-immutable-share-size": 10 }, "application-version": str(allmydata.__full_version__), } def callRemote(self, methname, *args, **kwargs): def _call(): meth = getattr(self, methname) return meth(*args, **kwargs) d = fireEventually() d.addCallback(lambda res: _call()) return d def allocate_buckets(self, storage_index, renew_secret, cancel_secret, sharenums, share_size, canary): #print "FakeStorageServer.allocate_buckets(num=%d, size=%d)" % (len(sharenums), share_size) if self.mode == "first-fail": if self.queries == 0: raise ServerError if self.mode == "second-fail": if self.queries == 1: raise ServerError self.queries += 1 if self.mode == "full": return (set(), {},) elif self.mode == "already got them": return (set(sharenums), {},) else: for shnum in sharenums: self.allocated.append( (storage_index, shnum) ) return (set(), dict([( shnum, FakeBucketWriter(share_size) ) for shnum in sharenums]), ) class FakeBucketWriter: # a diagnostic version of storageserver.BucketWriter def __init__(self, size): self.data = StringIO() self.closed = False self._size = size def callRemote(self, methname, *args, **kwargs): def _call(): meth = getattr(self, "remote_" + methname) return meth(*args, **kwargs) d = fireEventually() d.addCallback(lambda res: _call()) return d def remote_write(self, offset, data): precondition(not self.closed) precondition(offset >= 0) precondition(offset+len(data) <= self._size, "offset=%d + data=%d > size=%d" % (offset, len(data), self._size)) self.data.seek(offset) self.data.write(data) def remote_close(self): precondition(not self.closed) self.closed = True def remote_abort(self): log.err(RuntimeError("uh oh, I was asked to abort")) class FakeClient: DEFAULT_ENCODING_PARAMETERS = {"k":25, "happy": 75, "n": 100, "max_segment_size": 1*MiB, } def __init__(self, mode="good", num_servers=50): self.num_servers = num_servers if type(mode) is str: mode = dict([i,mode] for i in range(num_servers)) peers = [ ("%20d"%fakeid, FakeStorageServer(mode[fakeid])) for fakeid in range(self.num_servers) ] self.storage_broker = StorageFarmBroker(None, permute_peers=True) for (serverid, server) in peers: self.storage_broker.test_add_server(serverid, server) self.last_peers = [p[1] for p in peers] def log(self, *args, **kwargs): pass def get_encoding_parameters(self): return self.DEFAULT_ENCODING_PARAMETERS def get_storage_broker(self): return self.storage_broker _secret_holder = client.SecretHolder("lease secret", "convergence secret") class GotTooFarError(Exception): pass class GiganticUploadable(upload.FileHandle): def __init__(self, size): self._size = size self._fp = 0 def get_encryption_key(self): return defer.succeed("\x00" * 16) def get_size(self): return defer.succeed(self._size) def read(self, length): left = self._size - self._fp length = min(left, length) self._fp += length if self._fp > 1000000: # terminate the test early. raise GotTooFarError("we shouldn't be allowed to get this far") return defer.succeed(["\x00" * length]) def close(self): pass DATA = """ Once upon a time, there was a beautiful princess named Buttercup. She lived in a magical land where every file was stored securely among millions of machines, and nobody ever worried about their data being lost ever again. The End. """ assert len(DATA) > upload.Uploader.URI_LIT_SIZE_THRESHOLD SIZE_ZERO = 0 SIZE_SMALL = 16 SIZE_LARGE = len(DATA) def upload_data(uploader, data): u = upload.Data(data, convergence=None) return uploader.upload(u) def upload_filename(uploader, filename): u = upload.FileName(filename, convergence=None) return uploader.upload(u) def upload_filehandle(uploader, fh): u = upload.FileHandle(fh, convergence=None) return uploader.upload(u) class GoodServer(unittest.TestCase, ShouldFailMixin, SetDEPMixin): def setUp(self): self.node = FakeClient(mode="good") self.u = upload.Uploader() self.u.running = True self.u.parent = self.node def _check_small(self, newuri, size): u = uri.from_string(newuri) self.failUnless(isinstance(u, uri.LiteralFileURI)) self.failUnlessEqual(len(u.data), size) def _check_large(self, newuri, size): u = uri.from_string(newuri) self.failUnless(isinstance(u, uri.CHKFileURI)) self.failUnless(isinstance(u.get_storage_index(), str)) self.failUnlessEqual(len(u.get_storage_index()), 16) self.failUnless(isinstance(u.key, str)) self.failUnlessEqual(len(u.key), 16) self.failUnlessEqual(u.size, size) def get_data(self, size): return DATA[:size] def test_too_large(self): # we've removed the 4GiB share size limit (see ticket #346 for # details), but still have an 8-byte field, so the limit is now # 2**64, so make sure we reject files larger than that. k = 3; happy = 7; n = 10 self.set_encoding_parameters(k, happy, n) big = k*(2**64) data1 = GiganticUploadable(big) d = self.shouldFail(FileTooLargeError, "test_too_large-data1", "This file is too large to be uploaded (data_size)", self.u.upload, data1) data2 = GiganticUploadable(big-3) d.addCallback(lambda res: self.shouldFail(FileTooLargeError, "test_too_large-data2", "This file is too large to be uploaded (offsets)", self.u.upload, data2)) # I don't know where the actual limit is.. it depends upon how large # the hash trees wind up. It's somewhere close to k*4GiB-ln2(size). return d def test_data_zero(self): data = self.get_data(SIZE_ZERO) d = upload_data(self.u, data) d.addCallback(extract_uri) d.addCallback(self._check_small, SIZE_ZERO) return d def test_data_small(self): data = self.get_data(SIZE_SMALL) d = upload_data(self.u, data) d.addCallback(extract_uri) d.addCallback(self._check_small, SIZE_SMALL) return d def test_data_large(self): data = self.get_data(SIZE_LARGE) d = upload_data(self.u, data) d.addCallback(extract_uri) d.addCallback(self._check_large, SIZE_LARGE) return d def test_data_large_odd_segments(self): data = self.get_data(SIZE_LARGE) segsize = int(SIZE_LARGE / 2.5) # we want 3 segments, since that's not a power of two self.set_encoding_parameters(25, 75, 100, segsize) d = upload_data(self.u, data) d.addCallback(extract_uri) d.addCallback(self._check_large, SIZE_LARGE) return d def test_filehandle_zero(self): data = self.get_data(SIZE_ZERO) d = upload_filehandle(self.u, StringIO(data)) d.addCallback(extract_uri) d.addCallback(self._check_small, SIZE_ZERO) return d def test_filehandle_small(self): data = self.get_data(SIZE_SMALL) d = upload_filehandle(self.u, StringIO(data)) d.addCallback(extract_uri) d.addCallback(self._check_small, SIZE_SMALL) return d def test_filehandle_large(self): data = self.get_data(SIZE_LARGE) d = upload_filehandle(self.u, StringIO(data)) d.addCallback(extract_uri) d.addCallback(self._check_large, SIZE_LARGE) return d def test_filename_zero(self): fn = "Uploader-test_filename_zero.data" f = open(fn, "wb") data = self.get_data(SIZE_ZERO) f.write(data) f.close() d = upload_filename(self.u, fn) d.addCallback(extract_uri) d.addCallback(self._check_small, SIZE_ZERO) return d def test_filename_small(self): fn = "Uploader-test_filename_small.data" f = open(fn, "wb") data = self.get_data(SIZE_SMALL) f.write(data) f.close() d = upload_filename(self.u, fn) d.addCallback(extract_uri) d.addCallback(self._check_small, SIZE_SMALL) return d def test_filename_large(self): fn = "Uploader-test_filename_large.data" f = open(fn, "wb") data = self.get_data(SIZE_LARGE) f.write(data) f.close() d = upload_filename(self.u, fn) d.addCallback(extract_uri) d.addCallback(self._check_large, SIZE_LARGE) return d class ServerErrors(unittest.TestCase, ShouldFailMixin, SetDEPMixin): def make_node(self, mode, num_servers=10): self.node = FakeClient(mode, num_servers) self.u = upload.Uploader() self.u.running = True self.u.parent = self.node def _check_large(self, newuri, size): u = uri.from_string(newuri) self.failUnless(isinstance(u, uri.CHKFileURI)) self.failUnless(isinstance(u.get_storage_index(), str)) self.failUnlessEqual(len(u.get_storage_index()), 16) self.failUnless(isinstance(u.key, str)) self.failUnlessEqual(len(u.key), 16) self.failUnlessEqual(u.size, size) def test_first_error(self): mode = dict([(0,"good")] + [(i,"first-fail") for i in range(1,10)]) self.make_node(mode) d = upload_data(self.u, DATA) d.addCallback(extract_uri) d.addCallback(self._check_large, SIZE_LARGE) return d def test_first_error_all(self): self.make_node("first-fail") d = self.shouldFail(NoSharesError, "first_error_all", "peer selection failed", upload_data, self.u, DATA) def _check((f,)): self.failUnlessIn("placed 0 shares out of 100 total", str(f.value)) # there should also be a 'last failure was' message self.failUnlessIn("ServerError", str(f.value)) d.addCallback(_check) return d def test_second_error(self): # we want to make sure we make it to a third pass. This means that # the first pass was insufficient to place all shares, and at least # one of second pass servers (other than the last one) accepted a # share (so we'll believe that a third pass will be useful). (if # everyone but the last server throws an error, then we'll send all # the remaining shares to the last server at the end of the second # pass, and if that succeeds, we won't make it to a third pass). # # we can achieve this 97.5% of the time by using 40 servers, having # 39 of them fail on the second request, leaving only one to succeed # on the second request. (we need to keep the number of servers low # enough to ensure a second pass with 100 shares). mode = dict([(0,"good")] + [(i,"second-fail") for i in range(1,40)]) self.make_node(mode, 40) d = upload_data(self.u, DATA) d.addCallback(extract_uri) d.addCallback(self._check_large, SIZE_LARGE) return d def test_second_error_all(self): self.make_node("second-fail") d = self.shouldFail(NotEnoughSharesError, "second_error_all", "peer selection failed", upload_data, self.u, DATA) def _check((f,)): self.failUnlessIn("placed 10 shares out of 100 total", str(f.value)) # there should also be a 'last failure was' message self.failUnlessIn("ServerError", str(f.value)) d.addCallback(_check) return d class FullServer(unittest.TestCase): def setUp(self): self.node = FakeClient(mode="full") self.u = upload.Uploader() self.u.running = True self.u.parent = self.node def _should_fail(self, f): self.failUnless(isinstance(f, Failure) and f.check(NoSharesError), f) def test_data_large(self): data = DATA d = upload_data(self.u, data) d.addBoth(self._should_fail) return d class PeerSelection(unittest.TestCase): def make_client(self, num_servers=50): self.node = FakeClient(mode="good", num_servers=num_servers) self.u = upload.Uploader() self.u.running = True self.u.parent = self.node def get_data(self, size): return DATA[:size] def _check_large(self, newuri, size): u = uri.from_string(newuri) self.failUnless(isinstance(u, uri.CHKFileURI)) self.failUnless(isinstance(u.get_storage_index(), str)) self.failUnlessEqual(len(u.get_storage_index()), 16) self.failUnless(isinstance(u.key, str)) self.failUnlessEqual(len(u.key), 16) self.failUnlessEqual(u.size, size) def set_encoding_parameters(self, k, happy, n, max_segsize=1*MiB): p = {"k": k, "happy": happy, "n": n, "max_segment_size": max_segsize, } self.node.DEFAULT_ENCODING_PARAMETERS = p def test_one_each(self): # if we have 50 shares, and there are 50 peers, and they all accept a # share, we should get exactly one share per peer self.make_client() data = self.get_data(SIZE_LARGE) self.set_encoding_parameters(25, 30, 50) d = upload_data(self.u, data) d.addCallback(extract_uri) d.addCallback(self._check_large, SIZE_LARGE) def _check(res): for p in self.node.last_peers: allocated = p.allocated self.failUnlessEqual(len(allocated), 1) self.failUnlessEqual(p.queries, 1) d.addCallback(_check) return d def test_two_each(self): # if we have 100 shares, and there are 50 peers, and they all accept # all shares, we should get exactly two shares per peer self.make_client() data = self.get_data(SIZE_LARGE) self.set_encoding_parameters(50, 75, 100) d = upload_data(self.u, data) d.addCallback(extract_uri) d.addCallback(self._check_large, SIZE_LARGE) def _check(res): for p in self.node.last_peers: allocated = p.allocated self.failUnlessEqual(len(allocated), 2) self.failUnlessEqual(p.queries, 2) d.addCallback(_check) return d def test_one_each_plus_one_extra(self): # if we have 51 shares, and there are 50 peers, then one peer gets # two shares and the rest get just one self.make_client() data = self.get_data(SIZE_LARGE) self.set_encoding_parameters(24, 41, 51) d = upload_data(self.u, data) d.addCallback(extract_uri) d.addCallback(self._check_large, SIZE_LARGE) def _check(res): got_one = [] got_two = [] for p in self.node.last_peers: allocated = p.allocated self.failUnless(len(allocated) in (1,2), len(allocated)) if len(allocated) == 1: self.failUnlessEqual(p.queries, 1) got_one.append(p) else: self.failUnlessEqual(p.queries, 2) got_two.append(p) self.failUnlessEqual(len(got_one), 49) self.failUnlessEqual(len(got_two), 1) d.addCallback(_check) return d def test_four_each(self): # if we have 200 shares, and there are 50 peers, then each peer gets # 4 shares. The design goal is to accomplish this with only two # queries per peer. self.make_client() data = self.get_data(SIZE_LARGE) self.set_encoding_parameters(100, 150, 200) d = upload_data(self.u, data) d.addCallback(extract_uri) d.addCallback(self._check_large, SIZE_LARGE) def _check(res): for p in self.node.last_peers: allocated = p.allocated self.failUnlessEqual(len(allocated), 4) self.failUnlessEqual(p.queries, 2) d.addCallback(_check) return d def test_three_of_ten(self): # if we have 10 shares and 3 servers, I want to see 3+3+4 rather than # 4+4+2 self.make_client(3) data = self.get_data(SIZE_LARGE) self.set_encoding_parameters(3, 5, 10) d = upload_data(self.u, data) d.addCallback(extract_uri) d.addCallback(self._check_large, SIZE_LARGE) def _check(res): counts = {} for p in self.node.last_peers: allocated = p.allocated counts[len(allocated)] = counts.get(len(allocated), 0) + 1 histogram = [counts.get(i, 0) for i in range(5)] self.failUnlessEqual(histogram, [0,0,0,2,1]) d.addCallback(_check) return d def test_some_big_some_small(self): # 10 shares, 20 servers, but half the servers don't support a # share-size large enough for our file mode = dict([(i,{0:"good",1:"small"}[i%2]) for i in range(20)]) self.node = FakeClient(mode, num_servers=20) self.u = upload.Uploader() self.u.running = True self.u.parent = self.node data = self.get_data(SIZE_LARGE) self.set_encoding_parameters(3, 5, 10) d = upload_data(self.u, data) d.addCallback(extract_uri) d.addCallback(self._check_large, SIZE_LARGE) def _check(res): # we should have put one share each on the big peers, and zero # shares on the small peers total_allocated = 0 for p in self.node.last_peers: if p.mode == "good": self.failUnlessEqual(len(p.allocated), 1) elif p.mode == "small": self.failUnlessEqual(len(p.allocated), 0) total_allocated += len(p.allocated) self.failUnlessEqual(total_allocated, 10) d.addCallback(_check) return d class StorageIndex(unittest.TestCase): def test_params_must_matter(self): DATA = "I am some data" u = upload.Data(DATA, convergence="") eu = upload.EncryptAnUploadable(u) d1 = eu.get_storage_index() # CHK means the same data should encrypt the same way u = upload.Data(DATA, convergence="") eu = upload.EncryptAnUploadable(u) d1a = eu.get_storage_index() # but if we use a different convergence string it should be different u = upload.Data(DATA, convergence="wheee!") eu = upload.EncryptAnUploadable(u) d1salt1 = eu.get_storage_index() # and if we add yet a different convergence it should be different again u = upload.Data(DATA, convergence="NOT wheee!") eu = upload.EncryptAnUploadable(u) d1salt2 = eu.get_storage_index() # and if we use the first string again it should be the same as last time u = upload.Data(DATA, convergence="wheee!") eu = upload.EncryptAnUploadable(u) d1salt1a = eu.get_storage_index() # and if we change the encoding parameters, it should be different (from the same convergence string with different encoding parameters) u = upload.Data(DATA, convergence="") u.encoding_param_k = u.default_encoding_param_k + 1 eu = upload.EncryptAnUploadable(u) d2 = eu.get_storage_index() # and if we use a random key, it should be different than the CHK u = upload.Data(DATA, convergence=None) eu = upload.EncryptAnUploadable(u) d3 = eu.get_storage_index() # and different from another instance u = upload.Data(DATA, convergence=None) eu = upload.EncryptAnUploadable(u) d4 = eu.get_storage_index() d = DeferredListShouldSucceed([d1,d1a,d1salt1,d1salt2,d1salt1a,d2,d3,d4]) def _done(res): si1, si1a, si1salt1, si1salt2, si1salt1a, si2, si3, si4 = res self.failUnlessEqual(si1, si1a) self.failIfEqual(si1, si2) self.failIfEqual(si1, si3) self.failIfEqual(si1, si4) self.failIfEqual(si3, si4) self.failIfEqual(si1salt1, si1) self.failIfEqual(si1salt1, si1salt2) self.failIfEqual(si1salt2, si1) self.failUnlessEqual(si1salt1, si1salt1a) d.addCallback(_done) return d class EncodingParameters(GridTestMixin, unittest.TestCase, SetDEPMixin, ShouldFailMixin): def _do_upload_with_broken_servers(self, servers_to_break): """ I act like a normal upload, but before I send the results of Tahoe2PeerSelector to the Encoder, I break the first servers_to_break PeerTrackers in the used_peers part of the return result. """ assert self.g, "I tried to find a grid at self.g, but failed" broker = self.g.clients[0].storage_broker sh = self.g.clients[0]._secret_holder data = upload.Data("data" * 10000, convergence="") data.encoding_param_k = 3 data.encoding_param_happy = 4 data.encoding_param_n = 10 uploadable = upload.EncryptAnUploadable(data) encoder = encode.Encoder() encoder.set_encrypted_uploadable(uploadable) status = upload.UploadStatus() selector = upload.Tahoe2PeerSelector("dglev", "test", status) storage_index = encoder.get_param("storage_index") share_size = encoder.get_param("share_size") block_size = encoder.get_param("block_size") num_segments = encoder.get_param("num_segments") d = selector.get_shareholders(broker, sh, storage_index, share_size, block_size, num_segments, 10, 4) def _have_shareholders((used_peers, already_peers)): assert servers_to_break <= len(used_peers) for index in xrange(servers_to_break): server = list(used_peers)[index] for share in server.buckets.keys(): server.buckets[share].abort() buckets = {} for peer in used_peers: buckets.update(peer.buckets) encoder.set_shareholders(buckets) d = encoder.start() return d d.addCallback(_have_shareholders) return d def _add_server_with_share(self, server_number, share_number=None, readonly=False): assert self.g, "I tried to find a grid at self.g, but failed" assert self.shares, "I tried to find shares at self.shares, but failed" ss = self.g.make_server(server_number, readonly) self.g.add_server(server_number, ss) if share_number: # Copy share i from the directory associated with the first # storage server to the directory associated with this one. old_share_location = self.shares[share_number][2] new_share_location = os.path.join(ss.storedir, "shares") si = uri.from_string(self.uri).get_storage_index() new_share_location = os.path.join(new_share_location, storage_index_to_dir(si)) if not os.path.exists(new_share_location): os.makedirs(new_share_location) new_share_location = os.path.join(new_share_location, str(share_number)) shutil.copy(old_share_location, new_share_location) shares = self.find_shares(self.uri) # Make sure that the storage server has the share. self.failUnless((share_number, ss.my_nodeid, new_share_location) in shares) def _setup_and_upload(self): """ I set up a NoNetworkGrid with a single server and client, upload a file to it, store its uri in self.uri, and store its sharedata in self.shares. """ self.set_up_grid(num_clients=1, num_servers=1) client = self.g.clients[0] client.DEFAULT_ENCODING_PARAMETERS['happy'] = 1 data = upload.Data("data" * 10000, convergence="") self.data = data d = client.upload(data) def _store_uri(ur): self.uri = ur.uri d.addCallback(_store_uri) d.addCallback(lambda ign: self.find_shares(self.uri)) def _store_shares(shares): self.shares = shares d.addCallback(_store_shares) return d def test_configure_parameters(self): self.basedir = self.mktemp() hooks = {0: self._set_up_nodes_extra_config} self.set_up_grid(client_config_hooks=hooks) c0 = self.g.clients[0] DATA = "data" * 100 u = upload.Data(DATA, convergence="") d = c0.upload(u) d.addCallback(lambda ur: c0.create_node_from_uri(ur.uri)) m = monitor.Monitor() d.addCallback(lambda fn: fn.check(m)) def _check(cr): data = cr.get_data() self.failUnlessEqual(data["count-shares-needed"], 7) self.failUnlessEqual(data["count-shares-expected"], 12) d.addCallback(_check) return d def _setUp(self, ns): # Used by test_happy_semantics and test_prexisting_share_behavior # to set up the grid. self.node = FakeClient(mode="good", num_servers=ns) self.u = upload.Uploader() self.u.running = True self.u.parent = self.node def test_happy_semantics(self): self._setUp(2) DATA = upload.Data("kittens" * 10000, convergence="") # These parameters are unsatisfiable with the client that we've made # -- we'll use them to test that the semnatics work correctly. self.set_encoding_parameters(k=3, happy=5, n=10) d = self.shouldFail(NotEnoughSharesError, "test_happy_semantics", "shares could only be placed on 2 servers " "(5 were requested)", self.u.upload, DATA) # Let's reset the client to have 10 servers d.addCallback(lambda ign: self._setUp(10)) # These parameters are satisfiable with the client we've made. d.addCallback(lambda ign: self.set_encoding_parameters(k=3, happy=5, n=10)) # this should work d.addCallback(lambda ign: self.u.upload(DATA)) # Let's reset the client to have 7 servers # (this is less than n, but more than h) d.addCallback(lambda ign: self._setUp(7)) # These encoding parameters should still be satisfiable with our # client setup d.addCallback(lambda ign: self.set_encoding_parameters(k=3, happy=5, n=10)) # This, then, should work. d.addCallback(lambda ign: self.u.upload(DATA)) return d def test_problem_layouts(self): self.basedir = self.mktemp() # This scenario is at # http://allmydata.org/trac/tahoe/ticket/778#comment:52 # # The scenario in comment:52 proposes that we have a layout # like: # server 1: share 1 # server 2: share 1 # server 3: share 1 # server 4: shares 2 - 10 # To get access to the shares, we will first upload to one # server, which will then have shares 1 - 10. We'll then # add three new servers, configure them to not accept any new # shares, then write share 1 directly into the serverdir of each. # Then each of servers 1 - 3 will report that they have share 1, # and will not accept any new share, while server 4 will report that # it has shares 2 - 10 and will accept new shares. # We'll then set 'happy' = 4, and see that an upload fails # (as it should) d = self._setup_and_upload() d.addCallback(lambda ign: self._add_server_with_share(1, 0, True)) d.addCallback(lambda ign: self._add_server_with_share(2, 0, True)) d.addCallback(lambda ign: self._add_server_with_share(3, 0, True)) # Remove the first share from server 0. def _remove_share_0(): share_location = self.shares[0][2] os.remove(share_location) d.addCallback(lambda ign: _remove_share_0()) # Set happy = 4 in the client. def _prepare(): client = self.g.clients[0] client.DEFAULT_ENCODING_PARAMETERS['happy'] = 4 return client d.addCallback(lambda ign: _prepare()) # Uploading data should fail d.addCallback(lambda client: self.shouldFail(NotEnoughSharesError, "test_happy_semantics", "shares could only be placed on 1 servers " "(4 were requested)", client.upload, upload.Data("data" * 10000, convergence=""))) # This scenario is at # http://allmydata.org/trac/tahoe/ticket/778#comment:53 # # Set up the grid to have one server def _change_basedir(ign): self.basedir = self.mktemp() d.addCallback(_change_basedir) d.addCallback(lambda ign: self._setup_and_upload()) # We want to have a layout like this: # server 1: share 1 # server 2: share 2 # server 3: share 3 # server 4: shares 1 - 10 # (this is an expansion of Zooko's example because it is easier # to code, but it will fail in the same way) # To start, we'll create a server with shares 1-10 of the data # we're about to upload. # Next, we'll add three new servers to our NoNetworkGrid. We'll add # one share from our initial upload to each of these. # The counterintuitive ordering of the share numbers is to deal with # the permuting of these servers -- distributing the shares this # way ensures that the Tahoe2PeerSelector sees them in the order # described above. d.addCallback(lambda ign: self._add_server_with_share(server_number=1, share_number=2)) d.addCallback(lambda ign: self._add_server_with_share(server_number=2, share_number=0)) d.addCallback(lambda ign: self._add_server_with_share(server_number=3, share_number=1)) # So, we now have the following layout: # server 0: shares 1 - 10 # server 1: share 0 # server 2: share 1 # server 3: share 2 # We want to change the 'happy' parameter in the client to 4. # We then want to feed the upload process a list of peers that # server 0 is at the front of, so we trigger Zooko's scenario. # Ideally, a reupload of our original data should work. def _reset_encoding_parameters(ign): client = self.g.clients[0] client.DEFAULT_ENCODING_PARAMETERS['happy'] = 4 return client d.addCallback(_reset_encoding_parameters) # We need this to get around the fact that the old Data # instance already has a happy parameter set. d.addCallback(lambda client: client.upload(upload.Data("data" * 10000, convergence=""))) return d def test_dropped_servers_in_encoder(self): def _set_basedir(ign=None): self.basedir = self.mktemp() _set_basedir() d = self._setup_and_upload(); # Add 5 servers, with one share each from the original # Add a readonly server def _do_server_setup(ign): self._add_server_with_share(1, 1, True) self._add_server_with_share(2) self._add_server_with_share(3) self._add_server_with_share(4) self._add_server_with_share(5) d.addCallback(_do_server_setup) # remove the original server # (necessary to ensure that the Tahoe2PeerSelector will distribute # all the shares) def _remove_server(ign): server = self.g.servers_by_number[0] self.g.remove_server(server.my_nodeid) d.addCallback(_remove_server) # This should succeed. d.addCallback(lambda ign: self._do_upload_with_broken_servers(1)) # Now, do the same thing over again, but drop 2 servers instead # of 1. This should fail. d.addCallback(_set_basedir) d.addCallback(lambda ign: self._setup_and_upload()) d.addCallback(_do_server_setup) d.addCallback(_remove_server) d.addCallback(lambda ign: self.shouldFail(NotEnoughSharesError, "test_dropped_server_in_encoder", "", self._do_upload_with_broken_servers, 2)) return d def test_servers_with_unique_shares(self): # servers_with_unique_shares expects a dict of # shnum => peerid as a preexisting shares argument. test1 = { 1 : "server1", 2 : "server2", 3 : "server3", 4 : "server4" } unique_servers = upload.servers_with_unique_shares(test1) self.failUnlessEqual(4, len(unique_servers)) for server in ["server1", "server2", "server3", "server4"]: self.failUnlessIn(server, unique_servers) test1[4] = "server1" # Now there should only be 3 unique servers. unique_servers = upload.servers_with_unique_shares(test1) self.failUnlessEqual(3, len(unique_servers)) for server in ["server1", "server2", "server3"]: self.failUnlessIn(server, unique_servers) # servers_with_unique_shares expects a set of PeerTracker # instances as a used_peers argument, but only uses the peerid # instance variable to assess uniqueness. So we feed it some fake # PeerTrackers whose only important characteristic is that they # have peerid set to something. class FakePeerTracker: pass trackers = [] for server in ["server5", "server6", "server7", "server8"]: t = FakePeerTracker() t.peerid = server trackers.append(t) # Recall that there are 3 unique servers in test1. Since none of # those overlap with the ones in trackers, we should get 7 back unique_servers = upload.servers_with_unique_shares(test1, set(trackers)) self.failUnlessEqual(7, len(unique_servers)) expected_servers = ["server" + str(i) for i in xrange(1, 9)] expected_servers.remove("server4") for server in expected_servers: self.failUnlessIn(server, unique_servers) # Now add an overlapping server to trackers. t = FakePeerTracker() t.peerid = "server1" trackers.append(t) unique_servers = upload.servers_with_unique_shares(test1, set(trackers)) self.failUnlessEqual(7, len(unique_servers)) for server in expected_servers: self.failUnlessIn(server, unique_servers) def _set_up_nodes_extra_config(self, clientdir): cfgfn = os.path.join(clientdir, "tahoe.cfg") oldcfg = open(cfgfn, "r").read() f = open(cfgfn, "wt") f.write(oldcfg) f.write("\n") f.write("[client]\n") f.write("shares.needed = 7\n") f.write("shares.total = 12\n") f.write("\n") f.close() return None # TODO: # upload with exactly 75 peers (shares_of_happiness) # have a download fail # cancel a download (need to implement more cancel stuff)