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Fix bug in state handling where we incorrectly identified a missing pdu. Update tests to catch this case.

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This commit is contained in:
Erik Johnston 2014-09-08 19:50:46 +01:00
parent de727f854a
commit 83ce57302d
3 changed files with 271 additions and 71 deletions
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100
synapse/state.py
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@ -134,7 +134,9 @@ class StateHandler(object):
@defer.inlineCallbacks
@log_function
def _handle_new_state(self, new_pdu):
tree = yield self.store.get_unresolved_state_tree(new_pdu)
tree, missing_branch = yield self.store.get_unresolved_state_tree(
new_pdu
)
new_branch, current_branch = tree
logger.debug(
@ -142,64 +144,17 @@ class StateHandler(object):
new_branch, current_branch
)
if not current_branch:
# There is no current state
defer.returnValue(True)
return
n = new_branch[-1]
c = current_branch[-1]
if n.pdu_id == c.pdu_id and n.origin == c.origin:
# We have all the PDUs we need, so we can just do the conflict
# resolution.
if len(current_branch) == 1:
# This is a direct clobber so we can just...
defer.returnValue(True)
conflict_res = [
self._do_power_level_conflict_res,
self._do_chain_length_conflict_res,
self._do_hash_conflict_res,
]
for algo in conflict_res:
new_res, curr_res = algo(new_branch, current_branch)
if new_res < curr_res:
defer.returnValue(False)
elif new_res > curr_res:
defer.returnValue(True)
raise Exception("Conflict resolution failed.")
else:
# We need to ask for PDUs.
missing_prev = max(
new_branch[-1], current_branch[-1],
key=lambda x: x.depth
)
if not hasattr(missing_prev, "prev_state_id"):
# FIXME Hmm
# temporary fallback
for algo in conflict_res:
new_res, curr_res = algo(new_branch, current_branch)
if new_res < curr_res:
defer.returnValue(False)
elif new_res > curr_res:
defer.returnValue(True)
return
if missing_branch is not None:
# We're missing some PDUs. Fetch them.
# TODO (erikj): Limit this.
missing_prev = tree[missing_branch][-1]
pdu_id = missing_prev.prev_state_id
origin = missing_prev.prev_state_origin
is_missing = yield self.store.get_pdu(pdu_id, origin) is None
if not is_missing:
raise Exception("Conflict resolution failed.")
raise Exception("Conflict resolution failed")
yield self._replication.get_pdu(
destination=missing_prev.origin,
@ -211,6 +166,45 @@ class StateHandler(object):
updated_current = yield self._handle_new_state(new_pdu)
defer.returnValue(updated_current)
if not current_branch:
# There is no current state
defer.returnValue(True)
return
n = new_branch[-1]
c = current_branch[-1]
if n.pdu_id == c.pdu_id and n.origin == c.origin:
# We found a common ancestor!
if len(current_branch) == 1:
# This is a direct clobber so we can just...
defer.returnValue(True)
else:
# We didn't find a common ancestor. This is probably fine.
pass
result = self._do_conflict_res(new_branch, current_branch)
defer.returnValue(result)
def _do_conflict_res(self, new_branch, current_branch):
conflict_res = [
self._do_power_level_conflict_res,
self._do_chain_length_conflict_res,
self._do_hash_conflict_res,
]
for algo in conflict_res:
new_res, curr_res = algo(new_branch, current_branch)
if new_res < curr_res:
defer.returnValue(False)
elif new_res > curr_res:
defer.returnValue(True)
raise Exception("Conflict resolution failed.")
def _do_power_level_conflict_res(self, new_branch, current_branch):
max_power_new = max(
new_branch[:-1],