From: Zooko O'Whielacronx Date: Thu, 8 Jan 2009 19:13:07 +0000 (-0700) Subject: naming: Rename a few things which I touched or changed in the recent patch to downloa... X-Git-Url: https://git.rkrishnan.org/vdrive/%22file:/frontends/%22doc.html/%3C?a=commitdiff_plain;h=157e365d2bf106cce046a1b468198319833e4386;p=tahoe-lafs%2Ftahoe-lafs.git naming: Rename a few things which I touched or changed in the recent patch to download-without-decrypting. Rename "downloadable" to "target". Rename "u" to "v" in FileDownloader.__init__(). Rename "_uri" to "_verifycap" in FileDownloader. Rename "_downloadable" to "_target" in FileDownloader. Rename "FileDownloader" to "CiphertextDownloader". --- diff --git a/src/allmydata/immutable/download.py b/src/allmydata/immutable/download.py index f4921f53..89689da9 100644 --- a/src/allmydata/immutable/download.py +++ b/src/allmydata/immutable/download.py @@ -44,27 +44,27 @@ class DownloadResults: class DecryptingTarget(log.PrefixingLogMixin): implements(IDownloadTarget, IConsumer) - def __init__(self, downloadable, key, _log_msg_id=None): - precondition(IDownloadTarget.providedBy(downloadable), downloadable) - self.downloadable = downloadable + def __init__(self, target, key, _log_msg_id=None): + precondition(IDownloadTarget.providedBy(target), target) + self.target = target self._decryptor = AES(key) - prefix = str(downloadable) + prefix = str(target) log.PrefixingLogMixin.__init__(self, "allmydata.immutable.download", _log_msg_id, prefix=prefix) def registerProducer(self, producer, streaming): - if IConsumer.providedBy(self.downloadable): - self.downloadable.registerProducer(producer, streaming) + if IConsumer.providedBy(self.target): + self.target.registerProducer(producer, streaming) def unregisterProducer(self): - if IConsumer.providedBy(self.downloadable): - self.downloadable.unregisterProducer() + if IConsumer.providedBy(self.target): + self.target.unregisterProducer() def write(self, ciphertext): plaintext = self._decryptor.process(ciphertext) - self.downloadable.write(plaintext) + self.target.write(plaintext) def open(self, size): - self.downloadable.open(size) + self.target.open(size) def close(self): - self.downloadable.close() + self.target.close() def finish(self): - return self.downloadable.finish() + return self.target.finish() class ValidatedThingObtainer: def __init__(self, validatedthingproxies, debugname, log_id): @@ -482,7 +482,7 @@ class SegmentDownloader: """I am responsible for downloading all the blocks for a single segment of data. - I am a child of the FileDownloader. + I am a child of the CiphertextDownloader. """ def __init__(self, parent, segmentnumber, needed_shares, results): @@ -603,36 +603,36 @@ class DownloadStatus: def set_results(self, value): self.results = value -class FileDownloader(log.PrefixingLogMixin): +class CiphertextDownloader(log.PrefixingLogMixin): """ I download shares, check their integrity, then decode them, check the integrity of the resulting ciphertext, then and write it to my target. """ implements(IPushProducer) _status = None - def __init__(self, client, u, downloadable): - precondition(IVerifierURI.providedBy(u), u) - precondition(IDownloadTarget.providedBy(downloadable), downloadable) + def __init__(self, client, v, target): + precondition(IVerifierURI.providedBy(v), v) + precondition(IDownloadTarget.providedBy(target), target) - prefix=base32.b2a_l(u.get_storage_index()[:8], 60) + prefix=base32.b2a_l(v.get_storage_index()[:8], 60) log.PrefixingLogMixin.__init__(self, facility="tahoe.immutable.download", prefix=prefix) self._client = client - self._uri = u - self._storage_index = u.get_storage_index() - self._uri_extension_hash = u.uri_extension_hash + self._verifycap = v + self._storage_index = v.get_storage_index() + self._uri_extension_hash = v.uri_extension_hash self._vup = None # ValidatedExtendedURIProxy self._started = time.time() self._status = s = DownloadStatus() s.set_status("Starting") s.set_storage_index(self._storage_index) - s.set_size(self._uri.size) + s.set_size(self._verifycap.size) s.set_helper(False) s.set_active(True) self._results = DownloadResults() s.set_results(self._results) - self._results.file_size = self._uri.size + self._results.file_size = self._verifycap.size self._results.timings["servers_peer_selection"] = {} self._results.timings["fetch_per_server"] = {} self._results.timings["cumulative_fetch"] = 0.0 @@ -642,9 +642,9 @@ class FileDownloader(log.PrefixingLogMixin): self._paused = False self._stopped = False - if IConsumer.providedBy(downloadable): - downloadable.registerProducer(self, True) - self._downloadable = downloadable + if IConsumer.providedBy(target): + target.registerProducer(self, True) + self._target = target self._opened = False self.active_buckets = {} # k: shnum, v: bucket @@ -656,7 +656,7 @@ class FileDownloader(log.PrefixingLogMixin): self._ciphertext_hasher = hashutil.crypttext_hasher() self._bytes_done = 0 - self._status.set_progress(float(self._bytes_done)/self._uri.size) + self._status.set_progress(float(self._bytes_done)/self._verifycap.size) # _got_uri_extension() will create the following: # self._crypttext_hash_tree @@ -705,8 +705,8 @@ class FileDownloader(log.PrefixingLogMixin): self._status.set_status("Finished") self._status.set_active(False) self._status.set_paused(False) - if IConsumer.providedBy(self._downloadable): - self._downloadable.unregisterProducer() + if IConsumer.providedBy(self._target): + self._target.unregisterProducer() return res d.addBoth(_finished) def _failed(why): @@ -786,8 +786,8 @@ class FileDownloader(log.PrefixingLogMixin): now = time.time() self._results.timings["peer_selection"] = now - self._started - if len(self._share_buckets) < self._uri.needed_shares: - raise NotEnoughSharesError(len(self._share_buckets), self._uri.needed_shares) + if len(self._share_buckets) < self._verifycap.needed_shares: + raise NotEnoughSharesError(len(self._share_buckets), self._verifycap.needed_shares) #for s in self._share_vbuckets.values(): # for vb in s: @@ -806,7 +806,7 @@ class FileDownloader(log.PrefixingLogMixin): vups = [] for sharenum, bucket in self._share_buckets: - vups.append(ValidatedExtendedURIProxy(bucket, self._uri, self._fetch_failures)) + vups.append(ValidatedExtendedURIProxy(bucket, self._verifycap, self._fetch_failures)) vto = ValidatedThingObtainer(vups, debugname="vups", log_id=self._parentmsgid) d = vto.start() @@ -818,13 +818,13 @@ class FileDownloader(log.PrefixingLogMixin): self._vup = vup self._codec = codec.CRSDecoder() - self._codec.set_params(self._vup.segment_size, self._uri.needed_shares, self._uri.total_shares) + self._codec.set_params(self._vup.segment_size, self._verifycap.needed_shares, self._verifycap.total_shares) self._tail_codec = codec.CRSDecoder() - self._tail_codec.set_params(self._vup.tail_segment_size, self._uri.needed_shares, self._uri.total_shares) + self._tail_codec.set_params(self._vup.tail_segment_size, self._verifycap.needed_shares, self._verifycap.total_shares) self._current_segnum = 0 - self._share_hash_tree = hashtree.IncompleteHashTree(self._uri.total_shares) + self._share_hash_tree = hashtree.IncompleteHashTree(self._verifycap.total_shares) self._share_hash_tree.set_hashes({0: vup.share_root_hash}) self._crypttext_hash_tree = hashtree.IncompleteHashTree(self._vup.num_segments) @@ -858,17 +858,17 @@ class FileDownloader(log.PrefixingLogMixin): """either return a mapping from shnum to a ValidatedReadBucketProxy that can provide data for that share, or raise NotEnoughSharesError""" - while len(self.active_buckets) < self._uri.needed_shares: + while len(self.active_buckets) < self._verifycap.needed_shares: # need some more handled_shnums = set(self.active_buckets.keys()) available_shnums = set(self._share_vbuckets.keys()) potential_shnums = list(available_shnums - handled_shnums) - if len(potential_shnums) < (self._uri.needed_shares - len(self.active_buckets)): + if len(potential_shnums) < (self._verifycap.needed_shares - len(self.active_buckets)): raise NotEnoughSharesError # For the next share, choose a primary share if available, else a randomly chosen # secondary share. potential_shnums.sort() - if potential_shnums[0] < self._uri.needed_shares: + if potential_shnums[0] < self._verifycap.needed_shares: shnum = potential_shnums[0] else: shnum = random.choice(potential_shnums) @@ -919,7 +919,7 @@ class FileDownloader(log.PrefixingLogMixin): 100.0 * segnum / self._vup.num_segments)) # memory footprint: when the SegmentDownloader finishes pulling down # all shares, we have 1*segment_size of usage. - segmentdler = SegmentDownloader(self, segnum, self._uri.needed_shares, + segmentdler = SegmentDownloader(self, segnum, self._verifycap.needed_shares, self._results) started = time.time() d = segmentdler.start() @@ -960,13 +960,13 @@ class FileDownloader(log.PrefixingLogMixin): def _got_segment(self, buffers): precondition(self._crypttext_hash_tree) started_decrypt = time.time() - self._status.set_progress(float(self._current_segnum)/self._uri.size) + self._status.set_progress(float(self._current_segnum)/self._verifycap.size) if self._current_segnum + 1 == self._vup.num_segments: # This is the last segment. # Trim off any padding added by the upload side. We never send empty segments. If # the data was an exact multiple of the segment size, the last segment will be full. - tail_buf_size = mathutil.div_ceil(self._vup.tail_segment_size, self._uri.needed_shares) + tail_buf_size = mathutil.div_ceil(self._vup.tail_segment_size, self._verifycap.needed_shares) num_buffers_used = mathutil.div_ceil(self._vup.tail_data_size, tail_buf_size) # Remove buffers which don't contain any part of the tail. del buffers[num_buffers_used:] @@ -986,13 +986,13 @@ class FileDownloader(log.PrefixingLogMixin): # Then write this segment to the target. if not self._opened: self._opened = True - self._downloadable.open(self._uri.size) + self._target.open(self._verifycap.size) for buffer in buffers: - self._downloadable.write(buffer) + self._target.write(buffer) self._bytes_done += len(buffer) - self._status.set_progress(float(self._bytes_done)/self._uri.size) + self._status.set_progress(float(self._bytes_done)/self._verifycap.size) self._current_segnum += 1 if self._results: @@ -1010,10 +1010,10 @@ class FileDownloader(log.PrefixingLogMixin): "bad crypttext_hash: computed=%s, expected=%s" % (base32.b2a(self._ciphertext_hasher.digest()), base32.b2a(self._vup.crypttext_hash))) - _assert(self._bytes_done == self._uri.size, self._bytes_done, self._uri.size) + _assert(self._bytes_done == self._verifycap.size, self._bytes_done, self._verifycap.size) self._status.set_progress(1) - self._downloadable.close() - return self._downloadable.finish() + self._target.close() + return self._target.finish() def get_download_status(self): return self._status @@ -1138,7 +1138,7 @@ class Downloader(service.MultiService): self.stats_provider.count('downloader.bytes_downloaded', u.get_size()) target = DecryptingTarget(t, u.key, _log_msg_id=_log_msg_id) - dl = FileDownloader(self.parent, u.get_verify_cap(), target) + dl = CiphertextDownloader(self.parent, u.get_verify_cap(), target) self._add_download(dl) d = dl.start() return d diff --git a/src/allmydata/interfaces.py b/src/allmydata/interfaces.py index 5a03142c..12972742 100644 --- a/src/allmydata/interfaces.py +++ b/src/allmydata/interfaces.py @@ -1274,11 +1274,11 @@ class IDownloadTarget(Interface): is a Failure object indicating what went wrong. No further methods will be invoked on the IDownloadTarget after fail().""" def register_canceller(cb): - """The FileDownloader uses this to register a no-argument function + """The CiphertextDownloader uses this to register a no-argument function that the target can call to cancel the download. Once this canceller is invoked, no further calls to write() or close() will be made.""" def finish(): - """When the FileDownloader is done, this finish() function will be + """When the CiphertextDownloader is done, this finish() function will be called. Whatever it returns will be returned to the invoker of Downloader.download. """ diff --git a/src/allmydata/test/test_encode.py b/src/allmydata/test/test_encode.py index e4133ff2..0ec16586 100644 --- a/src/allmydata/test/test_encode.py +++ b/src/allmydata/test/test_encode.py @@ -494,11 +494,11 @@ class Roundtrip(unittest.TestCase, testutil.ShouldFailMixin): if not target: target = download.Data() target = download.DecryptingTarget(target, u.key) - fd = download.FileDownloader(client, u.get_verify_cap(), target) + fd = download.CiphertextDownloader(client, u.get_verify_cap(), target) - # we manually cycle the FileDownloader through a number of steps that + # we manually cycle the CiphertextDownloader through a number of steps that # would normally be sequenced by a Deferred chain in - # FileDownloader.start(), to give us more control over the process. + # CiphertextDownloader.start(), to give us more control over the process. # In particular, by bypassing _get_all_shareholders, we skip # permuted-peerlist selection. for shnum, bucket in shareholders.items(): @@ -515,7 +515,7 @@ class Roundtrip(unittest.TestCase, testutil.ShouldFailMixin): d = defer.succeed(None) - # have the FileDownloader retrieve a copy of uri_extension itself + # have the CiphertextDownloader retrieve a copy of uri_extension itself d.addCallback(fd._obtain_uri_extension) if "corrupt_crypttext_hashes" in recover_mode: @@ -535,7 +535,7 @@ class Roundtrip(unittest.TestCase, testutil.ShouldFailMixin): return fd._vup d.addCallback(_corrupt_crypttext_hashes) - # also have the FileDownloader ask for hash trees + # also have the CiphertextDownloader ask for hash trees d.addCallback(fd._get_crypttext_hash_tree) d.addCallback(fd._download_all_segments)