From: Brian Warner Date: Sat, 17 Oct 2009 20:31:46 +0000 (-0700) Subject: nodemaker.create_new_mutable_directory: pack_children() in initial_contents= X-Git-Tag: trac-4100~10 X-Git-Url: https://git.rkrishnan.org/listings/configuration.rst?a=commitdiff_plain;h=1273b5c233b076aa22fe187144483fb226ae1753;p=tahoe-lafs%2Ftahoe-lafs.git nodemaker.create_new_mutable_directory: pack_children() in initial_contents= instead of creating an empty file and then adding the children later. This should speed up mkdir(initial_children) considerably, removing two roundtrips and an entire read-modify-write cycle, probably bringing it down to a single roundtrip. A quick test (against the volunteergrid) suggests a 30% speedup. test_dirnode: add new tests to enforce the restrictions that interfaces.py claims for create_new_mutable_directory(): no UnknownNodes, metadata dicts --- diff --git a/src/allmydata/nodemaker.py b/src/allmydata/nodemaker.py index 70a6b8a5..bf65e5c7 100644 --- a/src/allmydata/nodemaker.py +++ b/src/allmydata/nodemaker.py @@ -1,9 +1,10 @@ import weakref from zope.interface import implements +from allmydata.util.assertutil import precondition from allmydata.interfaces import INodeMaker from allmydata.immutable.filenode import FileNode, LiteralFileNode from allmydata.mutable.filenode import MutableFileNode -from allmydata.dirnode import DirectoryNode +from allmydata.dirnode import DirectoryNode, pack_children from allmydata.unknown import UnknownNode from allmydata.uri import DirectoryURI, ReadonlyDirectoryURI @@ -79,8 +80,14 @@ class NodeMaker: return d def create_new_mutable_directory(self, initial_children={}): - d = self.create_mutable_file() + # initial_children must have metadata (i.e. {} instead of None), and + # should not contain UnknownNodes + for (name, (node, metadata)) in initial_children.iteritems(): + precondition(not isinstance(node, UnknownNode), + "create_new_mutable_directory does not accept UnknownNode", node) + precondition(isinstance(metadata, dict), + "create_new_mutable_directory requires metadata to be a dict, not None", metadata) + d = self.create_mutable_file(lambda n: + pack_children(n, initial_children)) d.addCallback(self._create_dirnode) - if initial_children: - d.addCallback(lambda n: n.set_nodes(initial_children)) return d diff --git a/src/allmydata/test/test_dirnode.py b/src/allmydata/test/test_dirnode.py index aed7e9d7..e4116567 100644 --- a/src/allmydata/test/test_dirnode.py +++ b/src/allmydata/test/test_dirnode.py @@ -40,10 +40,11 @@ class Dirnode(GridTestMixin, unittest.TestCase, self.basedir = "dirnode/Dirnode/test_initial_children" self.set_up_grid() c = self.g.clients[0] + nm = c.nodemaker setup_py_uri = "URI:CHK:n7r3m6wmomelk4sep3kw5cvduq:os7ijw5c3maek7pg65e5254k2fzjflavtpejjyhshpsxuqzhcwwq:3:20:14861" one_uri = "URI:LIT:n5xgk" # LIT for "one" - kids = {u"one": (c.nodemaker.create_from_cap(one_uri), {}), - u"two": (c.nodemaker.create_from_cap(setup_py_uri), + kids = {u"one": (nm.create_from_cap(one_uri), {}), + u"two": (nm.create_from_cap(setup_py_uri), {"metakey": "metavalue"}), } d = c.create_dirnode(kids) @@ -62,10 +63,24 @@ class Dirnode(GridTestMixin, unittest.TestCase, self.failUnless(isinstance(one_metadata, dict), one_metadata) self.failUnlessEqual(two_metadata["metakey"], "metavalue") d.addCallback(_check_kids) - d.addCallback(lambda ign: - c.nodemaker.create_new_mutable_directory(kids)) + d.addCallback(lambda ign: nm.create_new_mutable_directory(kids)) d.addCallback(lambda dn: dn.list()) d.addCallback(_check_kids) + future_writecap = "x-tahoe-crazy://I_am_from_the_future." + future_readcap = "x-tahoe-crazy-readonly://I_am_from_the_future." + future_node = UnknownNode(future_writecap, future_readcap) + bad_kids1 = {u"one": (future_node, {})} + d.addCallback(lambda ign: + self.shouldFail(AssertionError, "bad_kids1", + "does not accept UnknownNode", + nm.create_new_mutable_directory, + bad_kids1)) + bad_kids2 = {u"one": (nm.create_from_cap(one_uri), None)} + d.addCallback(lambda ign: + self.shouldFail(AssertionError, "bad_kids2", + "requires metadata to be a dict", + nm.create_new_mutable_directory, + bad_kids2)) return d def test_check(self): @@ -726,7 +741,7 @@ class Dirnode(GridTestMixin, unittest.TestCase, fake_file_uri = make_mutable_file_uri() other_file_uri = make_mutable_file_uri() md = {"metakey": "metavalue"} - kids = {u"kid1": (nm.create_from_cap(fake_file_uri), None), + kids = {u"kid1": (nm.create_from_cap(fake_file_uri), {}), u"kid2": (nm.create_from_cap(other_file_uri), md), } d = n.create_subdirectory(u"subdir", kids) @@ -811,12 +826,22 @@ class Packing(unittest.TestCase): class FakeMutableFile: counter = 0 def __init__(self, initial_contents=""): - self.data = initial_contents + self.data = self._get_initial_contents(initial_contents) counter = FakeMutableFile.counter FakeMutableFile.counter += 1 writekey = hashutil.ssk_writekey_hash(str(counter)) fingerprint = hashutil.ssk_pubkey_fingerprint_hash(str(counter)) self.uri = uri.WriteableSSKFileURI(writekey, fingerprint) + + def _get_initial_contents(self, contents): + if isinstance(contents, str): + return contents + if contents is None: + return "" + assert callable(contents), "%s should be callable, not %s" % \ + (contents, type(contents)) + return contents(self) + def get_uri(self): return self.uri.to_string() def download_best_version(self):