1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
# -*- coding: utf-8 -*-
# Copyright 2014 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from twisted.internet import defer
from synapse.util.logutils import log_function
from synapse.util.async import run_on_reactor
from synapse.api.events.room import RoomPowerLevelsEvent
from collections import namedtuple
import copy
import logging
import hashlib
logger = logging.getLogger(__name__)
def _get_state_key_from_event(event):
return event.state_key
KeyStateTuple = namedtuple("KeyStateTuple", ("context", "type", "state_key"))
class StateHandler(object):
""" Responsible for doing state conflict resolution.
"""
def __init__(self, hs):
self.store = hs.get_datastore()
@defer.inlineCallbacks
@log_function
def annotate_event_with_state(self, event, old_state=None):
yield run_on_reactor()
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
if hasattr(event, "state_key"):
event.state_events[(event.type, event.state_key)] = event
defer.returnValue(False)
return
if hasattr(event, "outlier") and event.outlier:
event.state_group = None
event.old_state_events = None
event.state_events = {}
defer.returnValue(False)
return
ids = [e for e, _ in event.prev_events]
ret = yield self.resolve_state_groups(ids)
state_group, new_state = ret
event.old_state_events = copy.deepcopy(new_state)
if hasattr(event, "state_key"):
key = (event.type, event.state_key)
if key in new_state:
event.replaces_state = new_state[key].event_id
new_state[key] = event
elif state_group:
event.state_group = state_group
event.state_events = new_state
defer.returnValue(False)
event.state_group = None
event.state_events = new_state
defer.returnValue(hasattr(event, "state_key"))
@defer.inlineCallbacks
def get_current_state(self, room_id, event_type=None, state_key=""):
events = yield self.store.get_latest_events_in_room(room_id)
event_ids = [
e_id
for e_id, _, _ in events
]
res = yield self.resolve_state_groups(event_ids)
if event_type:
defer.returnValue(res[1].get((event_type, state_key)))
return
defer.returnValue(res[1].values())
@defer.inlineCallbacks
@log_function
def resolve_state_groups(self, event_ids):
state_groups = yield self.store.get_state_groups(
event_ids
)
group_names = set(state_groups.keys())
if len(group_names) == 1:
name, state_list = state_groups.items().pop()
state = {
(e.type, e.state_key): e
for e in state_list
}
defer.returnValue((name, state))
state = {}
for group, g_state in state_groups.items():
for s in g_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] = self._resolve_state_events(events)
except:
logger.exception("Failed to resolve state")
raise
defer.returnValue((None, new_state))
def _get_power_level_from_event_state(self, event, user_id):
if hasattr(event, "old_state_events") and event.old_state_events:
key = (RoomPowerLevelsEvent.TYPE, "", )
power_level_event = event.old_state_events.get(key)
level = None
if power_level_event:
level = power_level_event.content.get("users", {}).get(
user_id
)
if not level:
level = power_level_event.content.get("users_default", 0)
return level
else:
return 0
@log_function
def _resolve_state_events(self, events):
curr_events = events
new_powers = [
self._get_power_level_from_event_state(e, e.user_id)
for e in curr_events
]
new_powers = [
int(p) if p else 0 for p in new_powers
]
max_power = max(new_powers)
curr_events = [
z[0] for z in zip(curr_events, new_powers)
if z[1] == max_power
]
if not curr_events:
raise RuntimeError("Max didn't get a max?")
elif len(curr_events) == 1:
return curr_events[0]
# TODO: For now, just choose the one with the largest event_id.
return (
sorted(
curr_events,
key=lambda e: hashlib.sha1(
e.event_id + e.user_id + e.room_id + e.type
).hexdigest()
)[0]
)
|
