From: Brian Warner <warner@lothar.com>
Date: Wed, 22 Oct 2008 08:38:18 +0000 (-0700)
Subject: more #514: pass a Monitor to all checker operations, make mutable-checker honor the... 
X-Git-Url: https://git.rkrishnan.org/%5B/%5D%20/uri/frontends/%22doc.html/?a=commitdiff_plain;h=977c6ac5107a6c4c84633b798be34345d453e0ca;p=tahoe-lafs%2Ftahoe-lafs.git

more #514: pass a Monitor to all checker operations, make mutable-checker honor the cancel flag
---

diff --git a/src/allmydata/dirnode.py b/src/allmydata/dirnode.py
index f36376a6..e87acf33 100644
--- a/src/allmydata/dirnode.py
+++ b/src/allmydata/dirnode.py
@@ -224,11 +224,11 @@ class NewDirectoryNode:
     def get_storage_index(self):
         return self._uri._filenode_uri.storage_index
 
-    def check(self, verify=False):
+    def check(self, monitor, verify=False):
         """Perform a file check. See IChecker.check for details."""
-        return self._node.check(verify)
-    def check_and_repair(self, verify=False):
-        return self._node.check_and_repair(verify)
+        return self._node.check(monitor, verify)
+    def check_and_repair(self, monitor, verify=False):
+        return self._node.check_and_repair(monitor, verify)
 
     def list(self):
         """I return a Deferred that fires with a dictionary mapping child
@@ -669,10 +669,10 @@ class DeepChecker:
 
     def add_node(self, node, childpath):
         if self._repair:
-            d = node.check_and_repair(self._verify)
+            d = node.check_and_repair(self.monitor, self._verify)
             d.addCallback(self._results.add_check_and_repair, childpath)
         else:
-            d = node.check(self._verify)
+            d = node.check(self.monitor, self._verify)
             d.addCallback(self._results.add_check, childpath)
         d.addCallback(lambda ignored: self._stats.add_node(node, childpath))
         return d
diff --git a/src/allmydata/immutable/filenode.py b/src/allmydata/immutable/filenode.py
index 93ba4047..2d87a1f9 100644
--- a/src/allmydata/immutable/filenode.py
+++ b/src/allmydata/immutable/filenode.py
@@ -55,7 +55,7 @@ class FileNode(ImmutableFileNode):
     def get_storage_index(self):
         return self.u.storage_index
 
-    def check(self, verify=False):
+    def check(self, monitor, verify=False):
         storage_index = self.u.storage_index
         k = self.u.needed_shares
         N = self.u.total_shares
@@ -68,7 +68,7 @@ class FileNode(ImmutableFileNode):
             v = self.checker_class(self._client, storage_index, k, N)
         return v.start()
 
-    def check_and_repair(self, verify=False):
+    def check_and_repair(self, monitor, verify=False):
         # this is a stub, to allow the deep-check tests to pass.
         #raise NotImplementedError("not implemented yet")
         from allmydata.checker_results import CheckAndRepairResults
@@ -113,10 +113,10 @@ class LiteralFileNode(ImmutableFileNode):
     def get_storage_index(self):
         return None
 
-    def check(self, verify=False):
+    def check(self, monitor, verify=False):
         return defer.succeed(None)
 
-    def check_and_repair(self, verify=False):
+    def check_and_repair(self, monitor, verify=False):
         return defer.succeed(None)
 
     def download(self, target):
diff --git a/src/allmydata/interfaces.py b/src/allmydata/interfaces.py
index 92edabc6..506d871a 100644
--- a/src/allmydata/interfaces.py
+++ b/src/allmydata/interfaces.py
@@ -422,23 +422,6 @@ class IFilesystemNode(Interface):
         download. This may be None if there is no storage index (i.e. LIT
         files)."""
 
-    def check(verify=False, repair=False):
-        """Perform a file check. See IChecker.check for details.
-
-        The default mode is named 'check' and simply asks each server whether
-        or not it has a share, and believes the answers. If verify=True, this
-        switches into the 'verify' mode, in which every byte of every share
-        is retrieved, and all hashes are verified. This uses much more
-        network and disk bandwidth than simple checking, especially for large
-        files, but will catch disk errors.
-
-        The default repair=False argument means that files which are not
-        perfectly healthy will be reported, but not fixed. When repair=True,
-        the node will attempt to repair the file first. The results will
-        indicate the initial status of the file in either case. If repair was
-        attempted, the results will indicate that too.
-        """
-
     def is_readonly():
         """Return True if this reference provides mutable access to the given
         file or directory (i.e. if you can modify it), or False if not. Note
@@ -1450,13 +1433,17 @@ class IUploader(Interface):
         """TODO: how should this work?"""
 
 class ICheckable(Interface):
-    def check(verify=False):
+    def check(monitor, verify=False):
         """Check upon my health, optionally repairing any problems.
 
         This returns a Deferred that fires with an instance that provides
         ICheckerResults, or None if the object is non-distributed (i.e. LIT
         files).
 
+        The monitor will be checked periodically to see if the operation has
+        been cancelled. If so, no new queries will be sent, and the Deferred
+        will fire (with a OperationCancelledError) immediately.
+
         Filenodes and dirnodes (which provide IFilesystemNode) are also
         checkable. Instances that represent verifier-caps will be checkable
         but not downloadable. Some objects (like LIT files) do not actually
@@ -1480,22 +1467,22 @@ class ICheckable(Interface):
         failures during retrieval, or is malicious or buggy, then
         verification will detect the problem, but checking will not.
 
-        If repair=True, then a non-healthy result will cause an immediate
-        repair operation, to generate and upload new shares. After repair,
-        the file will be as healthy as we can make it. Details about what
-        sort of repair is done will be put in the checker results. My
-        Deferred will not fire until the repair is complete.
-
         TODO: any problems seen during checking will be reported to the
         health-manager.furl, a centralized object which is responsible for
         figuring out why files are unhealthy so corrective action can be
         taken.
         """
 
-    def check_and_repair(verify=False):
+    def check_and_repair(monitor, verify=False):
         """Like check(), but if the file/directory is not healthy, attempt to
         repair the damage.
 
+        Any non-healthy result will cause an immediate repair operation, to
+        generate and upload new shares. After repair, the file will be as
+        healthy as we can make it. Details about what sort of repair is done
+        will be put in the check-and-repair results. The Deferred will not
+        fire until the repair is complete.
+
         This returns a Deferred which fires with an instance of
         ICheckAndRepairResults."""
 
diff --git a/src/allmydata/mutable/checker.py b/src/allmydata/mutable/checker.py
index 45404f84..73f6f8d6 100644
--- a/src/allmydata/mutable/checker.py
+++ b/src/allmydata/mutable/checker.py
@@ -11,8 +11,9 @@ from layout import unpack_share, SIGNED_PREFIX_LENGTH
 
 class MutableChecker:
 
-    def __init__(self, node):
+    def __init__(self, node, monitor):
         self._node = node
+        self._monitor = monitor
         self.bad_shares = [] # list of (nodeid,shnum,failure)
         self._storage_index = self._node.get_storage_index()
         self.results = CheckerResults(self._storage_index)
@@ -21,7 +22,7 @@ class MutableChecker:
 
     def check(self, verify=False):
         servermap = ServerMap()
-        u = ServermapUpdater(self._node, servermap, MODE_CHECK)
+        u = ServermapUpdater(self._node, self._monitor, servermap, MODE_CHECK)
         d = u.update()
         d.addCallback(self._got_mapupdate_results)
         if verify:
@@ -35,6 +36,7 @@ class MutableChecker:
         # the file is healthy if there is exactly one recoverable version, it
         # has at least N distinct shares, and there are no unrecoverable
         # versions: all existing shares will be for the same version.
+        self._monitor.raise_if_cancelled()
         self.best_version = None
         num_recoverable = len(servermap.recoverable_versions())
         if num_recoverable:
@@ -68,7 +70,7 @@ class MutableChecker:
             d = self._do_read(ss, peerid, self._storage_index, [shnum], readv)
             d.addCallback(self._got_answer, peerid, servermap)
             dl.append(d)
-        return defer.DeferredList(dl, fireOnOneErrback=True)
+        return defer.DeferredList(dl, fireOnOneErrback=True, consumeErrors=True)
 
     def _do_read(self, ss, peerid, storage_index, shnums, readv):
         # isolate the callRemote to a separate method, so tests can subclass
@@ -149,6 +151,7 @@ class MutableChecker:
         return counters
 
     def _fill_checker_results(self, smap, r):
+        self._monitor.raise_if_cancelled()
         r.set_servermap(smap.copy())
         healthy = True
         data = {}
@@ -265,8 +268,8 @@ class MutableChecker:
 
 
 class MutableCheckAndRepairer(MutableChecker):
-    def __init__(self, node):
-        MutableChecker.__init__(self, node)
+    def __init__(self, node, monitor):
+        MutableChecker.__init__(self, node, monitor)
         self.cr_results = CheckAndRepairResults(self._storage_index)
         self.cr_results.pre_repair_results = self.results
         self.need_repair = False
@@ -278,6 +281,7 @@ class MutableCheckAndRepairer(MutableChecker):
         return d
 
     def _maybe_repair(self, res):
+        self._monitor.raise_if_cancelled()
         if not self.need_repair:
             self.cr_results.post_repair_results = self.results
             return
diff --git a/src/allmydata/mutable/node.py b/src/allmydata/mutable/node.py
index d8991fca..b7d8800f 100644
--- a/src/allmydata/mutable/node.py
+++ b/src/allmydata/mutable/node.py
@@ -10,6 +10,7 @@ from allmydata.interfaces import IMutableFileNode, IMutableFileURI, \
 from allmydata.util import hashutil, log
 from allmydata.util.assertutil import precondition
 from allmydata.uri import WriteableSSKFileURI
+from allmydata.monitor import Monitor
 from allmydata.immutable.encode import NotEnoughSharesError
 from pycryptopp.publickey import rsa
 from pycryptopp.cipher.aes import AES
@@ -242,12 +243,12 @@ class MutableFileNode:
     #################################
     # ICheckable
 
-    def check(self, verify=False):
-        checker = self.checker_class(self)
+    def check(self, monitor, verify=False):
+        checker = self.checker_class(self, monitor)
         return checker.check(verify)
 
-    def check_and_repair(self, verify=False):
-        checker = self.check_and_repairer_class(self)
+    def check_and_repair(self, monitor, verify=False):
+        checker = self.check_and_repairer_class(self, monitor)
         return checker.check(verify)
 
     #################################
@@ -398,7 +399,7 @@ class MutableFileNode:
         servermap = ServerMap()
         return self._update_servermap(servermap, mode)
     def _update_servermap(self, servermap, mode):
-        u = ServermapUpdater(self, servermap, mode)
+        u = ServermapUpdater(self, Monitor(), servermap, mode)
         self._client.notify_mapupdate(u.get_status())
         return u.update()
 
diff --git a/src/allmydata/mutable/servermap.py b/src/allmydata/mutable/servermap.py
index b9697392..8c219616 100644
--- a/src/allmydata/mutable/servermap.py
+++ b/src/allmydata/mutable/servermap.py
@@ -333,13 +333,14 @@ class ServerMap:
 
 
 class ServermapUpdater:
-    def __init__(self, filenode, servermap, mode=MODE_READ):
+    def __init__(self, filenode, monitor, servermap, mode=MODE_READ):
         """I update a servermap, locating a sufficient number of useful
         shares and remembering where they are located.
 
         """
 
         self._node = filenode
+        self._monitor = monitor
         self._servermap = servermap
         self.mode = mode
         self._running = True
diff --git a/src/allmydata/test/common.py b/src/allmydata/test/common.py
index 40a51c08..0a74e8cc 100644
--- a/src/allmydata/test/common.py
+++ b/src/allmydata/test/common.py
@@ -46,7 +46,7 @@ class FakeCHKFileNode:
         return self.my_uri
     def get_verifier(self):
         return IURI(self.my_uri).get_verifier()
-    def check(self, verify=False):
+    def check(self, monitor, verify=False):
         r = CheckerResults(self.storage_index)
         is_bad = self.bad_shares.get(self.storage_index, None)
         data = {}
@@ -58,7 +58,7 @@ class FakeCHKFileNode:
              r.problems = []
         r.set_data(data)
         return defer.succeed(r)
-    def check_and_repair(self, verify=False):
+    def check_and_repair(self, monitor, verify=False):
         d = self.check(verify)
         def _got(cr):
             r = CheckAndRepairResults(self.storage_index)
@@ -149,7 +149,7 @@ class FakeMutableFileNode:
     def get_storage_index(self):
         return self.storage_index
 
-    def check(self, verify=False):
+    def check(self, monitor, verify=False):
         r = CheckerResults(self.storage_index)
         is_bad = self.bad_shares.get(self.storage_index, None)
         data = {}
@@ -165,7 +165,7 @@ class FakeMutableFileNode:
         r.set_data(data)
         return defer.succeed(r)
 
-    def check_and_repair(self, verify=False):
+    def check_and_repair(self, monitor, verify=False):
         d = self.check(verify)
         def _got(cr):
             r = CheckAndRepairResults(self.storage_index)
diff --git a/src/allmydata/test/test_dirnode.py b/src/allmydata/test/test_dirnode.py
index 242a47ea..c76d9b0b 100644
--- a/src/allmydata/test/test_dirnode.py
+++ b/src/allmydata/test/test_dirnode.py
@@ -9,6 +9,7 @@ from allmydata.interfaces import IURI, IClient, IMutableFileNode, \
      INewDirectoryURI, IReadonlyNewDirectoryURI, IFileNode, \
      ExistingChildError, IDeepCheckResults, IDeepCheckAndRepairResults
 from allmydata.util import hashutil, testutil
+from allmydata.monitor import Monitor
 from allmydata.test.common import make_chk_file_uri, make_mutable_file_uri, \
      FakeDirectoryNode, create_chk_filenode
 from allmydata.checker_results import CheckerResults, CheckAndRepairResults
@@ -127,7 +128,7 @@ class Dirnode(unittest.TestCase, testutil.ShouldFailMixin, testutil.StallMixin):
 
     def test_check(self):
         d = self.client.create_empty_dirnode()
-        d.addCallback(lambda dn: dn.check())
+        d.addCallback(lambda dn: dn.check(Monitor()))
         def _done(res):
             self.failUnless(res.is_healthy())
         d.addCallback(_done)
diff --git a/src/allmydata/test/test_filenode.py b/src/allmydata/test/test_filenode.py
index 5e3db055..7cca719e 100644
--- a/src/allmydata/test/test_filenode.py
+++ b/src/allmydata/test/test_filenode.py
@@ -1,6 +1,7 @@
 
 from twisted.trial import unittest
 from allmydata import uri
+from allmydata.monitor import Monitor
 from allmydata.immutable import filenode, download
 from allmydata.mutable.node import MutableFileNode
 from allmydata.util import hashutil
@@ -115,12 +116,12 @@ class LiteralChecker(unittest.TestCase):
         u = uri.LiteralFileURI(data=DATA)
         fn1 = filenode.LiteralFileNode(u, None)
 
-        d = fn1.check()
+        d = fn1.check(Monitor())
         def _check_checker_results(cr):
             self.failUnlessEqual(cr, None)
         d.addCallback(_check_checker_results)
 
-        d.addCallback(lambda res: fn1.check(verify=True))
+        d.addCallback(lambda res: fn1.check(Monitor(), verify=True))
         d.addCallback(_check_checker_results)
 
         return d
diff --git a/src/allmydata/test/test_immutable_checker.py b/src/allmydata/test/test_immutable_checker.py
index 194e17bd..7d1d99d8 100644
--- a/src/allmydata/test/test_immutable_checker.py
+++ b/src/allmydata/test/test_immutable_checker.py
@@ -1,6 +1,7 @@
 from allmydata.immutable import encode, upload
 from allmydata.test.common import SystemTestMixin, ShareManglingMixin
 from allmydata.util import testutil
+from allmydata.monitor import Monitor
 from allmydata.interfaces import IURI
 from twisted.internet import defer
 from twisted.trial import unittest
@@ -280,7 +281,7 @@ class Test(ShareManglingMixin, unittest.TestCase):
         # The following process of leaving 8 of the shares deleted and asserting that you can't
         # repair it is more to test this test code than to test the Tahoe code...
         def _then_repair(unused=None):
-            d2 = self.filenode.check_and_repair(verify=False)
+            d2 = self.filenode.check_and_repair(Monitor(), verify=False)
             def _after_repair(checkandrepairresults):
                 prerepairres = checkandrepairresults.get_pre_repair_results()
                 postrepairres = checkandrepairresults.get_post_repair_results()
@@ -323,7 +324,7 @@ class Test(ShareManglingMixin, unittest.TestCase):
         def _check1(filenode):
             before_check_reads = self._count_reads()
 
-            d2 = filenode.check(verify=False)
+            d2 = filenode.check(Monitor(), verify=False)
             def _after_check(checkresults):
                 after_check_reads = self._count_reads()
                 self.failIf(after_check_reads - before_check_reads > 0, after_check_reads - before_check_reads)
@@ -336,7 +337,7 @@ class Test(ShareManglingMixin, unittest.TestCase):
         d.addCallback(lambda ignore: self.replace_shares({}, storage_index=self.uri.storage_index))
         def _check2(ignored):
             before_check_reads = self._count_reads()
-            d2 = self.filenode.check(verify=False)
+            d2 = self.filenode.check(Monitor(), verify=False)
 
             def _after_check(checkresults):
                 after_check_reads = self._count_reads()
@@ -360,7 +361,7 @@ class Test(ShareManglingMixin, unittest.TestCase):
         def _check1(filenode):
             before_check_reads = self._count_reads()
 
-            d2 = filenode.check(verify=True)
+            d2 = filenode.check(Monitor(), verify=True)
             def _after_check(checkresults):
                 after_check_reads = self._count_reads()
                 # print "delta was ", after_check_reads - before_check_reads
@@ -380,7 +381,7 @@ class Test(ShareManglingMixin, unittest.TestCase):
 
         def _check2(ignored):
             before_check_reads = self._count_reads()
-            d2 = self.filenode.check(verify=True)
+            d2 = self.filenode.check(Monitor(), verify=True)
 
             def _after_check(checkresults):
                 after_check_reads = self._count_reads()
@@ -435,7 +436,7 @@ class Test(ShareManglingMixin, unittest.TestCase):
             before_repair_reads = self._count_reads()
             before_repair_allocates = self._count_allocates()
 
-            d2 = filenode.check_and_repair(verify=False)
+            d2 = filenode.check_and_repair(Monitor(), verify=False)
             def _after_repair(checkandrepairresults):
                 prerepairres = checkandrepairresults.get_pre_repair_results()
                 postrepairres = checkandrepairresults.get_post_repair_results()
@@ -469,7 +470,7 @@ class Test(ShareManglingMixin, unittest.TestCase):
             before_repair_reads = self._count_reads()
             before_repair_allocates = self._count_allocates()
 
-            d2 = filenode.check_and_repair(verify=False)
+            d2 = filenode.check_and_repair(Monitor(), verify=False)
             def _after_repair(checkandrepairresults):
                 prerepairres = checkandrepairresults.get_pre_repair_results()
                 postrepairres = checkandrepairresults.get_post_repair_results()
@@ -496,7 +497,7 @@ class Test(ShareManglingMixin, unittest.TestCase):
             before_repair_reads = self._count_reads()
             before_repair_allocates = self._count_allocates()
 
-            d2 = filenode.check_and_repair(verify=False)
+            d2 = filenode.check_and_repair(Monitor(), verify=False)
             def _after_repair(checkandrepairresults):
                 prerepairres = checkandrepairresults.get_pre_repair_results()
                 postrepairres = checkandrepairresults.get_post_repair_results()
diff --git a/src/allmydata/test/test_mutable.py b/src/allmydata/test/test_mutable.py
index 6cb5a4b7..409bc930 100644
--- a/src/allmydata/test/test_mutable.py
+++ b/src/allmydata/test/test_mutable.py
@@ -13,6 +13,7 @@ from allmydata.util.hashutil import tagged_hash
 from allmydata.util.fileutil import make_dirs
 from allmydata.interfaces import IURI, IMutableFileURI, IUploadable, \
      FileTooLargeError, IRepairResults
+from allmydata.monitor import Monitor
 from allmydata.test.common import ShouldFailMixin
 from foolscap.eventual import eventually, fireEventually
 from foolscap.logging import log
@@ -698,12 +699,12 @@ class Servermap(unittest.TestCase, PublishMixin):
     def make_servermap(self, mode=MODE_CHECK, fn=None):
         if fn is None:
             fn = self._fn
-        smu = ServermapUpdater(fn, ServerMap(), mode)
+        smu = ServermapUpdater(fn, Monitor(), ServerMap(), mode)
         d = smu.update()
         return d
 
     def update_servermap(self, oldmap, mode=MODE_CHECK):
-        smu = ServermapUpdater(self._fn, oldmap, mode)
+        smu = ServermapUpdater(self._fn, Monitor(), oldmap, mode)
         d = smu.update()
         return d
 
@@ -877,7 +878,7 @@ class Roundtrip(unittest.TestCase, testutil.ShouldFailMixin, PublishMixin):
     def make_servermap(self, mode=MODE_READ, oldmap=None):
         if oldmap is None:
             oldmap = ServerMap()
-        smu = ServermapUpdater(self._fn, oldmap, mode)
+        smu = ServermapUpdater(self._fn, Monitor(), oldmap, mode)
         d = smu.update()
         return d
 
@@ -1203,14 +1204,14 @@ class Checker(unittest.TestCase, CheckerMixin, PublishMixin):
 
 
     def test_check_good(self):
-        d = self._fn.check()
+        d = self._fn.check(Monitor())
         d.addCallback(self.check_good, "test_check_good")
         return d
 
     def test_check_no_shares(self):
         for shares in self._storage._peers.values():
             shares.clear()
-        d = self._fn.check()
+        d = self._fn.check(Monitor())
         d.addCallback(self.check_bad, "test_check_no_shares")
         return d
 
@@ -1219,44 +1220,44 @@ class Checker(unittest.TestCase, CheckerMixin, PublishMixin):
             for shnum in shares.keys():
                 if shnum > 0:
                     del shares[shnum]
-        d = self._fn.check()
+        d = self._fn.check(Monitor())
         d.addCallback(self.check_bad, "test_check_not_enough_shares")
         return d
 
     def test_check_all_bad_sig(self):
         corrupt(None, self._storage, 1) # bad sig
-        d = self._fn.check()
+        d = self._fn.check(Monitor())
         d.addCallback(self.check_bad, "test_check_all_bad_sig")
         return d
 
     def test_check_all_bad_blocks(self):
         corrupt(None, self._storage, "share_data", [9]) # bad blocks
         # the Checker won't notice this.. it doesn't look at actual data
-        d = self._fn.check()
+        d = self._fn.check(Monitor())
         d.addCallback(self.check_good, "test_check_all_bad_blocks")
         return d
 
     def test_verify_good(self):
-        d = self._fn.check(verify=True)
+        d = self._fn.check(Monitor(), verify=True)
         d.addCallback(self.check_good, "test_verify_good")
         return d
 
     def test_verify_all_bad_sig(self):
         corrupt(None, self._storage, 1) # bad sig
-        d = self._fn.check(verify=True)
+        d = self._fn.check(Monitor(), verify=True)
         d.addCallback(self.check_bad, "test_verify_all_bad_sig")
         return d
 
     def test_verify_one_bad_sig(self):
         corrupt(None, self._storage, 1, [9]) # bad sig
-        d = self._fn.check(verify=True)
+        d = self._fn.check(Monitor(), verify=True)
         d.addCallback(self.check_bad, "test_verify_one_bad_sig")
         return d
 
     def test_verify_one_bad_block(self):
         corrupt(None, self._storage, "share_data", [9]) # bad blocks
         # the Verifier *will* notice this, since it examines every byte
-        d = self._fn.check(verify=True)
+        d = self._fn.check(Monitor(), verify=True)
         d.addCallback(self.check_bad, "test_verify_one_bad_block")
         d.addCallback(self.check_expected_failure,
                       CorruptShareError, "block hash tree failure",
@@ -1265,7 +1266,7 @@ class Checker(unittest.TestCase, CheckerMixin, PublishMixin):
 
     def test_verify_one_bad_sharehash(self):
         corrupt(None, self._storage, "share_hash_chain", [9], 5)
-        d = self._fn.check(verify=True)
+        d = self._fn.check(Monitor(), verify=True)
         d.addCallback(self.check_bad, "test_verify_one_bad_sharehash")
         d.addCallback(self.check_expected_failure,
                       CorruptShareError, "corrupt hashes",
@@ -1274,7 +1275,7 @@ class Checker(unittest.TestCase, CheckerMixin, PublishMixin):
 
     def test_verify_one_bad_encprivkey(self):
         corrupt(None, self._storage, "enc_privkey", [9]) # bad privkey
-        d = self._fn.check(verify=True)
+        d = self._fn.check(Monitor(), verify=True)
         d.addCallback(self.check_bad, "test_verify_one_bad_encprivkey")
         d.addCallback(self.check_expected_failure,
                       CorruptShareError, "invalid privkey",
@@ -1285,7 +1286,7 @@ class Checker(unittest.TestCase, CheckerMixin, PublishMixin):
         corrupt(None, self._storage, "enc_privkey", [9]) # bad privkey
         readonly_fn = self._fn.get_readonly()
         # a read-only node has no way to validate the privkey
-        d = readonly_fn.check(verify=True)
+        d = readonly_fn.check(Monitor(), verify=True)
         d.addCallback(self.check_good,
                       "test_verify_one_bad_encprivkey_uncheckable")
         return d
@@ -1308,7 +1309,7 @@ class Repair(unittest.TestCase, PublishMixin, ShouldFailMixin):
         self.old_shares = []
         d = self.publish_one()
         d.addCallback(self.copy_shares)
-        d.addCallback(lambda res: self._fn.check())
+        d.addCallback(lambda res: self._fn.check(Monitor()))
         d.addCallback(lambda check_results: self._fn.repair(check_results))
         def _check_results(rres):
             self.failUnless(IRepairResults.providedBy(rres))
@@ -1363,7 +1364,7 @@ class Repair(unittest.TestCase, PublishMixin, ShouldFailMixin):
                       self._set_versions({0:3,2:3,4:3,6:3,8:3,
                                           1:4,3:4,5:4,7:4,9:4}))
         d.addCallback(self.copy_shares)
-        d.addCallback(lambda res: self._fn.check())
+        d.addCallback(lambda res: self._fn.check(Monitor()))
         def _try_repair(check_results):
             ex = "There were multiple recoverable versions with identical seqnums, so force=True must be passed to the repair() operation"
             d2 = self.shouldFail(MustForceRepairError, "test_merge", ex,
@@ -1451,7 +1452,7 @@ class MultipleEncodings(unittest.TestCase):
     def make_servermap(self, mode=MODE_READ, oldmap=None):
         if oldmap is None:
             oldmap = ServerMap()
-        smu = ServermapUpdater(self._fn, oldmap, mode)
+        smu = ServermapUpdater(self._fn, Monitor(), oldmap, mode)
         d = smu.update()
         return d
 
@@ -1563,7 +1564,7 @@ class MultipleVersions(unittest.TestCase, PublishMixin, CheckerMixin):
         d = self._fn.download_best_version()
         d.addCallback(lambda res: self.failUnlessEqual(res, self.CONTENTS[4]))
         # and the checker should report problems
-        d.addCallback(lambda res: self._fn.check())
+        d.addCallback(lambda res: self._fn.check(Monitor()))
         d.addCallback(self.check_bad, "test_multiple_versions")
 
         # but if everything is at version 2, that's what we should download
diff --git a/src/allmydata/test/test_system.py b/src/allmydata/test/test_system.py
index 64524822..1bc671dd 100644
--- a/src/allmydata/test/test_system.py
+++ b/src/allmydata/test/test_system.py
@@ -16,7 +16,7 @@ from allmydata.scripts import runner
 from allmydata.interfaces import IDirectoryNode, IFileNode, IFileURI, \
      ICheckerResults, ICheckAndRepairResults, IDeepCheckResults, \
      IDeepCheckAndRepairResults
-from allmydata.monitor import OperationCancelledError
+from allmydata.monitor import Monitor, OperationCancelledError
 from allmydata.mutable.common import NotMutableError
 from allmydata.mutable import layout as mutable_layout
 from foolscap import DeadReferenceError
@@ -1689,21 +1689,21 @@ class SystemTest(SystemTestMixin, unittest.TestCase):
         ut = upload.Data("too big to be literal" * 200, convergence=None)
         d = self._personal_node.add_file(u"big file", ut)
 
-        d.addCallback(lambda res: self._personal_node.check())
+        d.addCallback(lambda res: self._personal_node.check(Monitor()))
         def _check_dirnode_results(r):
             self.failUnless(r.is_healthy())
         d.addCallback(_check_dirnode_results)
-        d.addCallback(lambda res: self._personal_node.check(verify=True))
+        d.addCallback(lambda res: self._personal_node.check(Monitor(), verify=True))
         d.addCallback(_check_dirnode_results)
 
         d.addCallback(lambda res: self._personal_node.get(u"big file"))
         def _got_chk_filenode(n):
             self.failUnless(isinstance(n, filenode.FileNode))
-            d = n.check()
+            d = n.check(Monitor())
             def _check_filenode_results(r):
                 self.failUnless(r.is_healthy())
             d.addCallback(_check_filenode_results)
-            d.addCallback(lambda res: n.check(verify=True))
+            d.addCallback(lambda res: n.check(Monitor(), verify=True))
             d.addCallback(_check_filenode_results)
             return d
         d.addCallback(_got_chk_filenode)
@@ -1711,11 +1711,11 @@ class SystemTest(SystemTestMixin, unittest.TestCase):
         d.addCallback(lambda res: self._personal_node.get(u"sekrit data"))
         def _got_lit_filenode(n):
             self.failUnless(isinstance(n, filenode.LiteralFileNode))
-            d = n.check()
+            d = n.check(Monitor())
             def _check_lit_filenode_results(r):
                 self.failUnlessEqual(r, None)
             d.addCallback(_check_lit_filenode_results)
-            d.addCallback(lambda res: n.check(verify=True))
+            d.addCallback(lambda res: n.check(Monitor(), verify=True))
             d.addCallback(_check_lit_filenode_results)
             return d
         d.addCallback(_got_lit_filenode)
@@ -1993,45 +1993,45 @@ class DeepCheckWeb(SystemTestMixin, unittest.TestCase, WebErrorMixin):
     def do_test_good(self, ignored):
         d = defer.succeed(None)
         # check the individual items
-        d.addCallback(lambda ign: self.root.check())
+        d.addCallback(lambda ign: self.root.check(Monitor()))
         d.addCallback(self.check_is_healthy, self.root, "root")
-        d.addCallback(lambda ign: self.mutable.check())
+        d.addCallback(lambda ign: self.mutable.check(Monitor()))
         d.addCallback(self.check_is_healthy, self.mutable, "mutable")
-        d.addCallback(lambda ign: self.large.check())
+        d.addCallback(lambda ign: self.large.check(Monitor()))
         d.addCallback(self.check_is_healthy, self.large, "large")
-        d.addCallback(lambda ign: self.small.check())
+        d.addCallback(lambda ign: self.small.check(Monitor()))
         d.addCallback(self.failUnlessEqual, None, "small")
 
         # and again with verify=True
-        d.addCallback(lambda ign: self.root.check(verify=True))
+        d.addCallback(lambda ign: self.root.check(Monitor(), verify=True))
         d.addCallback(self.check_is_healthy, self.root, "root")
-        d.addCallback(lambda ign: self.mutable.check(verify=True))
+        d.addCallback(lambda ign: self.mutable.check(Monitor(), verify=True))
         d.addCallback(self.check_is_healthy, self.mutable, "mutable")
-        d.addCallback(lambda ign: self.large.check(verify=True))
+        d.addCallback(lambda ign: self.large.check(Monitor(), verify=True))
         d.addCallback(self.check_is_healthy, self.large, "large",
                       incomplete=True)
-        d.addCallback(lambda ign: self.small.check(verify=True))
+        d.addCallback(lambda ign: self.small.check(Monitor(), verify=True))
         d.addCallback(self.failUnlessEqual, None, "small")
 
         # and check_and_repair(), which should be a nop
-        d.addCallback(lambda ign: self.root.check_and_repair())
+        d.addCallback(lambda ign: self.root.check_and_repair(Monitor()))
         d.addCallback(self.check_and_repair_is_healthy, self.root, "root")
-        d.addCallback(lambda ign: self.mutable.check_and_repair())
+        d.addCallback(lambda ign: self.mutable.check_and_repair(Monitor()))
         d.addCallback(self.check_and_repair_is_healthy, self.mutable, "mutable")
-        d.addCallback(lambda ign: self.large.check_and_repair())
+        d.addCallback(lambda ign: self.large.check_and_repair(Monitor()))
         d.addCallback(self.check_and_repair_is_healthy, self.large, "large")
-        d.addCallback(lambda ign: self.small.check_and_repair())
+        d.addCallback(lambda ign: self.small.check_and_repair(Monitor()))
         d.addCallback(self.failUnlessEqual, None, "small")
 
         # check_and_repair(verify=True)
-        d.addCallback(lambda ign: self.root.check_and_repair(verify=True))
+        d.addCallback(lambda ign: self.root.check_and_repair(Monitor(), verify=True))
         d.addCallback(self.check_and_repair_is_healthy, self.root, "root")
-        d.addCallback(lambda ign: self.mutable.check_and_repair(verify=True))
+        d.addCallback(lambda ign: self.mutable.check_and_repair(Monitor(), verify=True))
         d.addCallback(self.check_and_repair_is_healthy, self.mutable, "mutable")
-        d.addCallback(lambda ign: self.large.check_and_repair(verify=True))
+        d.addCallback(lambda ign: self.large.check_and_repair(Monitor(), verify=True))
         d.addCallback(self.check_and_repair_is_healthy, self.large, "large",
                       incomplete=True)
-        d.addCallback(lambda ign: self.small.check_and_repair(verify=True))
+        d.addCallback(lambda ign: self.small.check_and_repair(Monitor(), verify=True))
         d.addCallback(self.failUnlessEqual, None, "small")
 
 
diff --git a/src/allmydata/web/directory.py b/src/allmydata/web/directory.py
index a7cb43d5..3501fa72 100644
--- a/src/allmydata/web/directory.py
+++ b/src/allmydata/web/directory.py
@@ -15,6 +15,7 @@ from allmydata.util import base32
 from allmydata.uri import from_string_dirnode
 from allmydata.interfaces import IDirectoryNode, IFileNode, IMutableFileNode, \
      ExistingChildError
+from allmydata.monitor import Monitor
 from allmydata.web.common import text_plain, WebError, \
      IClient, IOpHandleTable, NeedOperationHandleError, \
      boolean_of_arg, get_arg, get_root, \
@@ -344,10 +345,10 @@ class DirectoryNodeHandler(RenderMixin, rend.Page, ReplaceMeMixin):
         verify = boolean_of_arg(get_arg(req, "verify", "false"))
         repair = boolean_of_arg(get_arg(req, "repair", "false"))
         if repair:
-            d = self.node.check_and_repair(verify)
+            d = self.node.check_and_repair(Monitor(), verify)
             d.addCallback(lambda res: CheckAndRepairResults(res))
         else:
-            d = self.node.check(verify)
+            d = self.node.check(Monitor(), verify)
             d.addCallback(lambda res: CheckerResults(res))
         return d
 
diff --git a/src/allmydata/web/filenode.py b/src/allmydata/web/filenode.py
index 81f5cd7c..a52dae43 100644
--- a/src/allmydata/web/filenode.py
+++ b/src/allmydata/web/filenode.py
@@ -9,6 +9,7 @@ from nevow import url, rend
 from nevow.inevow import IRequest
 
 from allmydata.interfaces import IDownloadTarget, ExistingChildError
+from allmydata.monitor import Monitor
 from allmydata.immutable.upload import FileHandle
 from allmydata.immutable.filenode import LiteralFileNode
 from allmydata.util import log
@@ -264,10 +265,10 @@ class FileNodeHandler(RenderMixin, rend.Page, ReplaceMeMixin):
         if isinstance(self.node, LiteralFileNode):
             return defer.succeed(LiteralCheckerResults())
         if repair:
-            d = self.node.check_and_repair(verify)
+            d = self.node.check_and_repair(Monitor(), verify)
             d.addCallback(lambda res: CheckAndRepairResults(res))
         else:
-            d = self.node.check(verify)
+            d = self.node.check(Monitor(), verify)
             d.addCallback(lambda res: CheckerResults(res))
         return d