From: Daira Hopwood Date: Thu, 20 Aug 2015 15:58:55 +0000 (+0100) Subject: Use deferredutil.HookMixin to simplify callback for tests. X-Git-Url: https://git.rkrishnan.org/specifications/%5B/%5D%20//%22%22?a=commitdiff_plain;h=06b1ce8b7fbd134028b44bd96a735c48e6e16f4e;p=tahoe-lafs%2Ftahoe-lafs.git Use deferredutil.HookMixin to simplify callback for tests. Signed-off-by: Daira Hopwood --- diff --git a/src/allmydata/frontends/magic_folder.py b/src/allmydata/frontends/magic_folder.py index 8c9fea4b..ff77adcb 100644 --- a/src/allmydata/frontends/magic_folder.py +++ b/src/allmydata/frontends/magic_folder.py @@ -13,8 +13,8 @@ from allmydata.util import fileutil from allmydata.interfaces import IDirectoryNode from allmydata.util import log from allmydata.util.fileutil import precondition_abspath, get_pathinfo - from allmydata.util.assertutil import precondition +from allmydata.util.deferredutil import HookMixin from allmydata.util.encodingutil import listdir_unicode, to_filepath, \ unicode_from_filepath, quote_local_unicode_path, FilenameEncodingError from allmydata.immutable.upload import FileName, Data @@ -90,13 +90,14 @@ class MagicFolder(service.MultiService): return service.MultiService.disownServiceParent(self) -class QueueMixin(object): +class QueueMixin(HookMixin): def __init__(self, client, local_path_u, db, name): self._client = client self._local_path_u = local_path_u self._local_path = to_filepath(local_path_u) self._db = db self._name = name + self._hooks = {'processed': None} if not self._local_path.exists(): raise AssertionError("The '[magic_folder] local.directory' parameter was %s " @@ -143,24 +144,10 @@ class QueueMixin(object): self._lazy_tail.addCallback(lambda ign: self._when_queue_is_empty()) else: self._lazy_tail.addCallback(lambda ign: self._process(item)) - #self._lazy_tail.addErrback(lambda f: self._log("error: %s" % (f,))) + self._lazy_tail.addBoth(self._call_hook, 'processed') + self._lazy_tail.addErrback(log.err) self._lazy_tail.addCallback(lambda ign: task.deferLater(reactor, self._turn_delay, self._turn_deque)) - def _do_callback(self, res): - if self._ignore_count == 0: - self._callback(res) - else: - self._ignore_count -= 1 - return None # intentionally suppress failures, which have already been logged - - def set_callback(self, callback, ignore_count=0): - """ - set_callback sets a function that will be called after a filesystem change - (either local or remote) has been processed, successfully or unsuccessfully. - """ - self._callback = callback - self._ignore_count = ignore_count - class Uploader(QueueMixin): def __init__(self, client, local_path_u, db, upload_dircap, inotify, pending_delay): @@ -375,7 +362,6 @@ class Uploader(QueueMixin): self._log("%r while processing %r" % (f, path_u)) return f d.addCallbacks(_succeeded, _failed) - d.addBoth(self._do_callback) return d def _get_metadata(self, encoded_name_u): @@ -556,11 +542,11 @@ class Downloader(QueueMixin): self._log("download failed: %s" % (str(f),)) self._count('objects_download_failed') return f - def remove_from_pending(ign): - self._pending.remove(name) d.addCallbacks(succeeded, failed) - d.addBoth(self._do_callback) - d.addCallback(remove_from_pending) + def remove_from_pending(res): + self._pending.remove(name) + return res + d.addBoth(remove_from_pending) return d def _write_downloaded_file(self, name, file_contents): diff --git a/src/allmydata/test/test_magic_folder.py b/src/allmydata/test/test_magic_folder.py index 092f3d5e..7d39ed85 100644 --- a/src/allmydata/test/test_magic_folder.py +++ b/src/allmydata/test/test_magic_folder.py @@ -125,8 +125,7 @@ class MagicFolderTestMixin(MagicFolderTestMixin, ShouldFailMixin, ReallyEqualMix def _check_move_empty_tree(res): self.mkdir_nonascii(empty_tree_dir) - d2 = defer.Deferred() - self.magicfolder.uploader.set_callback(d2.callback) + d2 = self.magicfolder.uploader.set_hook('processed') os.rename(empty_tree_dir, new_empty_tree_dir) self.notify(to_filepath(new_empty_tree_dir), self.inotify.IN_MOVED_TO) return d2 @@ -139,8 +138,7 @@ class MagicFolderTestMixin(MagicFolderTestMixin, ShouldFailMixin, ReallyEqualMix def _check_move_small_tree(res): self.mkdir_nonascii(small_tree_dir) fileutil.write(abspath_expanduser_unicode(u"what", base=small_tree_dir), "say when") - d2 = defer.Deferred() - self.magicfolder.uploader.set_callback(d2.callback, ignore_count=1) + d2 = self.magicfolder.uploader.set_hook('processed', ignore_count=1) os.rename(small_tree_dir, new_small_tree_dir) self.notify(to_filepath(new_small_tree_dir), self.inotify.IN_MOVED_TO) return d2 @@ -151,8 +149,7 @@ class MagicFolderTestMixin(MagicFolderTestMixin, ShouldFailMixin, ReallyEqualMix d.addCallback(lambda ign: self.failUnlessReallyEqual(self._get_count('uploader.directories_created'), 2)) def _check_moved_tree_is_watched(res): - d2 = defer.Deferred() - self.magicfolder.uploader.set_callback(d2.callback) + d2 = self.magicfolder.uploader.set_hook('processed') fileutil.write(abspath_expanduser_unicode(u"another", base=new_small_tree_dir), "file") self.notify(to_filepath(abspath_expanduser_unicode(u"another", base=new_small_tree_dir)), self.inotify.IN_CLOSE_WRITE) return d2 @@ -201,8 +198,7 @@ class MagicFolderTestMixin(MagicFolderTestMixin, ShouldFailMixin, ReallyEqualMix d.addCallback(self._create_magicfolder) def create_test_file(result): - d2 = defer.Deferred() - self.magicfolder.uploader.set_callback(d2.callback) + d2 = self.magicfolder.uploader.set_hook('processed') test_file = abspath_expanduser_unicode(u"what", base=self.local_dir) fileutil.write(test_file, "meow") self.notify(to_filepath(test_file), self.inotify.IN_CLOSE_WRITE) @@ -274,10 +270,7 @@ class MagicFolderTestMixin(MagicFolderTestMixin, ShouldFailMixin, ReallyEqualMix previously_uploaded = self._get_count('uploader.objects_succeeded') previously_disappeared = self._get_count('uploader.objects_disappeared') - # Note: this relies on the fact that we only get one IN_CLOSE_WRITE notification per file - # (otherwise we would get a defer.AlreadyCalledError). Should we be relying on that? - d = defer.Deferred() - self.magicfolder.uploader.set_callback(d.callback) + d = self.magicfolder.uploader.set_hook('processed') path_u = abspath_expanduser_unicode(name_u, base=self.local_dir) path = to_filepath(path_u) @@ -347,8 +340,7 @@ class MagicFolderTestMixin(MagicFolderTestMixin, ShouldFailMixin, ReallyEqualMix def Alice_wait_for_upload(result): print "Alice waits for an upload\n" - d2 = defer.Deferred() - self.alice_magicfolder.uploader.set_callback(d2.callback) + d2 = self.alice_magicfolder.uploader.set_hook('processed') return d2 d.addCallback(Alice_wait_for_upload) d.addCallback(lambda ign: self._check_version_in_dmd(self.alice_magicfolder, u"file1", 0)) @@ -361,8 +353,7 @@ class MagicFolderTestMixin(MagicFolderTestMixin, ShouldFailMixin, ReallyEqualMix def Bob_wait_for_download(result): print "Bob waits for a download\n" - d2 = defer.Deferred() - self.bob_magicfolder.downloader.set_callback(d2.callback) + d2 = self.bob_magicfolder.downloader.set_hook('processed') return d2 d.addCallback(Bob_wait_for_download) d.addCallback(lambda ign: self._check_version_in_local_db(self.bob_magicfolder, u"file1", 0)) diff --git a/src/allmydata/util/deferredutil.py b/src/allmydata/util/deferredutil.py index 989e85e8..4f148c68 100644 --- a/src/allmydata/util/deferredutil.py +++ b/src/allmydata/util/deferredutil.py @@ -5,6 +5,7 @@ from foolscap.api import eventually, fireEventually from twisted.internet import defer, reactor from allmydata.util import log +from allmydata.util.assertutil import _assert from allmydata.util.pollmixin import PollMixin @@ -77,11 +78,13 @@ class HookMixin: I am a helper mixin that maintains a collection of named hooks, primarily for use in tests. Each hook is set to an unfired Deferred using 'set_hook', and can then be fired exactly once at the appropriate time by '_call_hook'. + If 'ignore_count' is given, that number of calls to '_call_hook' will be + ignored before firing the hook. I assume a '_hooks' attribute that should set by the class constructor to a dict mapping each valid hook name to None. """ - def set_hook(self, name, d=None): + def set_hook(self, name, d=None, ignore_count=0): """ Called by the hook observer (e.g. by a test). If d is not given, an unfired Deferred is created and returned. @@ -89,16 +92,20 @@ class HookMixin: """ if d is None: d = defer.Deferred() - assert self._hooks[name] is None, self._hooks[name] - assert isinstance(d, defer.Deferred), d - self._hooks[name] = d + _assert(ignore_count >= 0, ignore_count=ignore_count) + _assert(name in self._hooks, name=name) + _assert(self._hooks[name] is None, name=name, hook=self._hooks[name]) + _assert(isinstance(d, defer.Deferred), d=d) + + self._hooks[name] = (d, ignore_count) return d def _call_hook(self, res, name): """ - Called to trigger the hook, with argument 'res'. This is a no-op if the - hook is unset. Otherwise, the hook will be unset, and then its Deferred - will be fired synchronously. + Called to trigger the hook, with argument 'res'. This is a no-op if + the hook is unset. If the hook's ignore_count is positive, it will be + decremented; if it was already zero, the hook will be unset, and then + its Deferred will be fired synchronously. The expected usage is "deferred.addBoth(self._call_hook, 'hookname')". This ensures that if 'res' is a failure, the hook will be errbacked, @@ -106,11 +113,15 @@ class HookMixin: 'res' is returned so that the current result or failure will be passed through. """ - d = self._hooks[name] - if d is None: + hook = self._hooks[name] + if hook is None: return defer.succeed(None) - self._hooks[name] = None - _with_log(d.callback, res) + (d, ignore_count) = hook + if ignore_count > 0: + self._hooks[name] = (d, ignore_count - 1) + else: + self._hooks[name] = None + _with_log(d.callback, res) return res