diff --git a/synapse/state.py b/synapse/state.py
index 9db84c9b5c..2548deed28 100644
--- a/synapse/state.py
+++ b/synapse/state.py
@@ -16,11 +16,14 @@
from twisted.internet import defer
-from synapse.federation.pdu_codec import encode_event_id, decode_event_id
from synapse.util.logutils import log_function
+from synapse.util.async import run_on_reactor
+
+from synapse.types import EventID
from collections import namedtuple
+import copy
import logging
import hashlib
@@ -35,13 +38,14 @@ KeyStateTuple = namedtuple("KeyStateTuple", ("context", "type", "state_key"))
class StateHandler(object):
- """ Repsonsible for doing state conflict resolution.
+ """ Responsible for doing state conflict resolution.
"""
def __init__(self, hs):
self.store = hs.get_datastore()
self._replication = hs.get_replication_layer()
self.server_name = hs.hostname
+ self.hs = hs
@defer.inlineCallbacks
@log_function
@@ -50,7 +54,7 @@ class StateHandler(object):
to update the state and b) works out what the prev_state should be.
Returns:
- Deferred: Resolved with a boolean indicating if we succesfully
+ Deferred: Resolved with a boolean indicating if we successfully
updated the state.
Raised:
@@ -71,128 +75,157 @@ class StateHandler(object):
# (w.r.t. to power levels)
snapshot.fill_out_prev_events(event)
+ yield self.annotate_state_groups(event)
- event.prev_events = [
- e for e in event.prev_events if e != event.event_id
- ]
-
- current_state = snapshot.prev_state_pdu
-
- if current_state:
- event.prev_state = encode_event_id(
- current_state.pdu_id, current_state.origin
+ if event.old_state_events:
+ current_state = event.old_state_events.get(
+ (event.type, event.state_key)
)
+ if current_state:
+ event.prev_state = current_state.event_id
+
# TODO check current_state to see if the min power level is less
# than the power level of the user
# power_level = self._get_power_level_for_event(event)
- pdu_id, origin = decode_event_id(event.event_id, self.server_name)
-
- yield self.store.update_current_state(
- pdu_id=pdu_id,
- origin=origin,
- context=key.context,
- pdu_type=key.type,
- state_key=key.state_key
- )
-
defer.returnValue(True)
@defer.inlineCallbacks
@log_function
- def handle_new_state(self, new_pdu):
- """ Apply conflict resolution to `new_pdu`.
+ def annotate_state_groups(self, event, old_state=None):
+ yield run_on_reactor()
- This should be called on every new state pdu, regardless of whether or
- not there is a conflict.
+ if old_state:
+ event.state_group = None
+ event.old_state_events = {
+ (s.type, s.state_key): s for s in old_state
+ }
+ event.state_events = event.old_state_events
- This function is safe against the race of it getting called with two
- `PDU`s trying to update the same state.
- """
+ if hasattr(event, "state_key"):
+ event.state_events[(event.type, event.state_key)] = event
- # This needs to be done in a transaction.
+ defer.returnValue(False)
+ return
- is_new = yield self._handle_new_state(new_pdu)
+ if hasattr(event, "outlier") and event.outlier:
+ event.state_group = None
+ event.old_state_events = None
+ event.state_events = {}
+ defer.returnValue(False)
+ return
- logger.debug("is_new: %s %s %s", is_new, new_pdu.pdu_id, new_pdu.origin)
+ new_state = yield self.resolve_state_groups(
+ [e for e, _ in event.prev_events]
+ )
- if is_new:
- yield self.store.update_current_state(
- pdu_id=new_pdu.pdu_id,
- origin=new_pdu.origin,
- context=new_pdu.context,
- pdu_type=new_pdu.pdu_type,
- state_key=new_pdu.state_key
- )
+ event.old_state_events = copy.deepcopy(new_state)
- defer.returnValue(is_new)
+ if hasattr(event, "state_key"):
+ new_state[(event.type, event.state_key)] = event
- def _get_power_level_for_event(self, event):
- # return self._persistence.get_power_level_for_user(event.room_id,
- # event.sender)
- return event.power_level
+ event.state_group = None
+ event.state_events = new_state
+
+ defer.returnValue(hasattr(event, "state_key"))
@defer.inlineCallbacks
- @log_function
- def _handle_new_state(self, new_pdu):
- tree, missing_branch = yield self.store.get_unresolved_state_tree(
- new_pdu
- )
- new_branch, current_branch = tree
+ def get_current_state(self, room_id, event_type=None, state_key=""):
+ events = yield self.store.get_latest_events_in_room(room_id)
- logger.debug(
- "_handle_new_state new=%s, current=%s",
- new_branch, current_branch
- )
+ event_ids = [
+ e_id
+ for e_id, _, _ in events
+ ]
- if missing_branch is not None:
- # We're missing some PDUs. Fetch them.
- # TODO (erikj): Limit this.
- missing_prev = tree[missing_branch][-1]
+ res = yield self.resolve_state_groups(event_ids)
- pdu_id = missing_prev.prev_state_id
- origin = missing_prev.prev_state_origin
+ if event_type:
+ defer.returnValue(res.get((event_type, state_key)))
+ return
- is_missing = yield self.store.get_pdu(pdu_id, origin) is None
- if not is_missing:
- raise Exception("Conflict resolution failed")
+ defer.returnValue(res.values())
- yield self._replication.get_pdu(
- destination=missing_prev.origin,
- pdu_origin=origin,
- pdu_id=pdu_id,
- outlier=True
- )
+ @defer.inlineCallbacks
+ @log_function
+ def resolve_state_groups(self, event_ids):
+ state_groups = yield self.store.get_state_groups(
+ event_ids
+ )
- updated_current = yield self._handle_new_state(new_pdu)
- defer.returnValue(updated_current)
+ state = {}
+ for group in state_groups:
+ for s in group.state:
+ state.setdefault(
+ (s.type, s.state_key),
+ {}
+ )[s.event_id] = s
+
+ unconflicted_state = {
+ k: v.values()[0] for k, v in state.items()
+ if len(v.values()) == 1
+ }
+
+ conflicted_state = {
+ k: v.values()
+ for k, v in state.items()
+ if len(v.values()) > 1
+ }
+
+ try:
+ new_state = {}
+ new_state.update(unconflicted_state)
+ for key, events in conflicted_state.items():
+ new_state[key] = yield self._resolve_state_events(events)
+ except:
+ logger.exception("Failed to resolve state")
+ raise
+
+ defer.returnValue(new_state)
- if not current_branch:
- # There is no current state
- defer.returnValue(True)
- return
+ @defer.inlineCallbacks
+ @log_function
+ def _resolve_state_events(self, events):
+ curr_events = events
- n = new_branch[-1]
- c = current_branch[-1]
+ new_powers_deferreds = []
+ for e in curr_events:
+ new_powers_deferreds.append(
+ self.store.get_power_level(e.room_id, e.user_id)
+ )
- common_ancestor = n.pdu_id == c.pdu_id and n.origin == c.origin
+ new_powers = yield defer.gatherResults(
+ new_powers_deferreds,
+ consumeErrors=True
+ )
- if common_ancestor:
- # We found a common ancestor!
+ max_power = max([int(p) for p in new_powers])
- if len(current_branch) == 1:
- # This is a direct clobber so we can just...
- defer.returnValue(True)
+ curr_events = [
+ z[0] for z in zip(curr_events, new_powers)
+ if int(z[1]) == max_power
+ ]
- else:
- # We didn't find a common ancestor. This is probably fine.
- pass
+ if not curr_events:
+ raise RuntimeError("Max didn't get a max?")
+ elif len(curr_events) == 1:
+ defer.returnValue(curr_events[0])
- result = yield self._do_conflict_res(
- new_branch, current_branch, common_ancestor
+ # TODO: For now, just choose the one with the largest event_id.
+ defer.returnValue(
+ sorted(
+ curr_events,
+ key=lambda e: hashlib.sha1(
+ e.event_id + e.user_id + e.room_id + e.type
+ ).hexdigest()
+ )[0]
)
- defer.returnValue(result)
+
+ def _get_power_level_for_event(self, event):
+ # return self._persistence.get_power_level_for_user(event.room_id,
+ # event.sender)
+ return event.power_level
@defer.inlineCallbacks
def _do_conflict_res(self, new_branch, current_branch, common_ancestor):
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