From: Brian Warner Date: Mon, 14 Jul 2008 22:25:21 +0000 (-0700) Subject: download: fix stopProducing failure ('self._paused_at not defined'), add tests X-Git-Url: https://git.rkrishnan.org/specifications//%22%3C?a=commitdiff_plain;h=fd465b4aaf1796770776df1492f7faa60db2344c;p=tahoe-lafs%2Ftahoe-lafs.git download: fix stopProducing failure ('self._paused_at not defined'), add tests --- diff --git a/src/allmydata/download.py b/src/allmydata/download.py index 572878ae..a33016f6 100644 --- a/src/allmydata/download.py +++ b/src/allmydata/download.py @@ -496,6 +496,8 @@ class FileDownloader: def resumeProducing(self): if self._paused: + paused_for = time.time() - self._paused_at + self._results.timings['paused'] += paused_for p = self._paused self._paused = None eventually(p.callback, None) @@ -505,8 +507,7 @@ class FileDownloader: def stopProducing(self): self.log("Download.stopProducing") self._stopped = True - paused_for = time.time() - self._paused_at - self._results.timings['paused'] += paused_for + self.resumeProducing() if self._status: self._status.set_stopped(True) self._status.set_active(False) diff --git a/src/allmydata/interfaces.py b/src/allmydata/interfaces.py index ff6b6b5b..1fbf95b1 100644 --- a/src/allmydata/interfaces.py +++ b/src/allmydata/interfaces.py @@ -1175,6 +1175,9 @@ class IDecoder(Interface): """ class IDownloadTarget(Interface): + # Note that if the IDownloadTarget is also an IConsumable, the downloader + # will register itself as a producer. This allows the target to invoke + # downloader.pauseProducing, resumeProducing, and stopProducing. def open(size): """Called before any calls to write() or close(). If an error occurs before any data is available, fail() may be called without diff --git a/src/allmydata/test/test_encode.py b/src/allmydata/test/test_encode.py index 6a0711e3..6ba0e6db 100644 --- a/src/allmydata/test/test_encode.py +++ b/src/allmydata/test/test_encode.py @@ -1,11 +1,12 @@ from zope.interface import implements from twisted.trial import unittest -from twisted.internet import defer +from twisted.internet import defer, reactor +from twisted.internet.interfaces import IConsumer from twisted.python.failure import Failure from foolscap import eventual from allmydata import encode, upload, download, hashtree, uri -from allmydata.util import hashutil +from allmydata.util import hashutil, testutil from allmydata.util.assertutil import _assert from allmydata.interfaces import IStorageBucketWriter, IStorageBucketReader @@ -274,13 +275,47 @@ class Encode(unittest.TestCase): # 5 segments: 25, 25, 25, 25, 1 return self.do_encode(25, 101, 100, 5, 15, 8) -class Roundtrip(unittest.TestCase): +class PausingTarget(download.Data): + implements(IConsumer) + def __init__(self): + download.Data.__init__(self) + self.size = 0 + self.writes = 0 + def write(self, data): + self.size += len(data) + self.writes += 1 + if self.writes <= 2: + # we happen to use 4 segments, and want to avoid pausing on the + # last one (since then the _unpause timer will still be running) + self.producer.pauseProducing() + reactor.callLater(0.1, self._unpause) + return download.Data.write(self, data) + def _unpause(self): + self.producer.resumeProducing() + def registerProducer(self, producer, streaming): + self.producer = producer + def unregisterProducer(self): + self.producer = None + +class PausingAndStoppingTarget(PausingTarget): + def write(self, data): + self.producer.pauseProducing() + reactor.callLater(0.5, self._stop) + def _stop(self): + self.producer.stopProducing() + +class StoppingTarget(PausingTarget): + def write(self, data): + self.producer.stopProducing() + +class Roundtrip(unittest.TestCase, testutil.ShouldFailMixin): def send_and_recover(self, k_and_happy_and_n=(25,75,100), AVAILABLE_SHARES=None, datalen=76, max_segment_size=25, bucket_modes={}, recover_mode="recover", + target=None, ): if AVAILABLE_SHARES is None: AVAILABLE_SHARES = k_and_happy_and_n[2] @@ -288,7 +323,8 @@ class Roundtrip(unittest.TestCase): d = self.send(k_and_happy_and_n, AVAILABLE_SHARES, max_segment_size, bucket_modes, data) # that fires with (uri_extension_hash, e, shareholders) - d.addCallback(self.recover, AVAILABLE_SHARES, recover_mode) + d.addCallback(self.recover, AVAILABLE_SHARES, recover_mode, + target=target) # that fires with newdata def _downloaded((newdata, fd)): self.failUnless(newdata == data) @@ -332,7 +368,7 @@ class Roundtrip(unittest.TestCase): return d def recover(self, (res, key, shareholders), AVAILABLE_SHARES, - recover_mode): + recover_mode, target=None): (uri_extension_hash, required_shares, num_shares, file_size) = res if "corrupt_key" in recover_mode: @@ -350,7 +386,8 @@ class Roundtrip(unittest.TestCase): URI = u.to_string() client = FakeClient() - target = download.Data() + if not target: + target = download.Data() fd = download.FileDownloader(client, URI, target) # we manually cycle the FileDownloader through a number of steps that @@ -436,6 +473,29 @@ class Roundtrip(unittest.TestCase): def test_101(self): return self.send_and_recover(datalen=101) + def test_pause(self): + # use a DownloadTarget that does pauseProducing/resumeProducing a few + # times, then finishes + t = PausingTarget() + d = self.send_and_recover(target=t) + return d + + def test_pause_then_stop(self): + # use a DownloadTarget that pauses, then stops. + t = PausingAndStoppingTarget() + d = self.shouldFail(download.DownloadStopped, "test_pause_then_stop", + "our Consumer called stopProducing()", + self.send_and_recover, target=t) + return d + + def test_stop(self): + # use a DownloadTarget that does an immediate stop (ticket #473) + t = StoppingTarget() + d = self.shouldFail(download.DownloadStopped, "test_stop", + "our Consumer called stopProducing()", + self.send_and_recover, target=t) + return d + # the following tests all use 4-out-of-10 encoding def test_bad_blocks(self):