475 lines
17 KiB
Python
475 lines
17 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from twisted.internet import defer
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from synapse.streams.config import PaginationConfig
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from synapse.types import StreamToken, UserID
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import synapse.util.async
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import baserules
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import logging
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import simplejson as json
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import re
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import random
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logger = logging.getLogger(__name__)
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class Pusher(object):
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INITIAL_BACKOFF = 1000
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MAX_BACKOFF = 60 * 60 * 1000
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GIVE_UP_AFTER = 24 * 60 * 60 * 1000
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DEFAULT_ACTIONS = ['dont_notify']
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INEQUALITY_EXPR = re.compile("^([=<>]*)([0-9]*)$")
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def __init__(self, _hs, profile_tag, user_name, app_id,
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app_display_name, device_display_name, pushkey, pushkey_ts,
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data, last_token, last_success, failing_since):
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self.hs = _hs
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self.evStreamHandler = self.hs.get_handlers().event_stream_handler
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self.store = self.hs.get_datastore()
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self.clock = self.hs.get_clock()
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self.profile_tag = profile_tag
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self.user_name = user_name
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self.app_id = app_id
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self.app_display_name = app_display_name
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self.device_display_name = device_display_name
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self.pushkey = pushkey
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self.pushkey_ts = pushkey_ts
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self.data = data
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self.last_token = last_token
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self.last_success = last_success # not actually used
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self.backoff_delay = Pusher.INITIAL_BACKOFF
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self.failing_since = failing_since
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self.alive = True
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# The last value of last_active_time that we saw
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self.last_last_active_time = 0
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self.has_unread = True
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@defer.inlineCallbacks
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def _actions_for_event(self, ev):
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"""
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This should take into account notification settings that the user
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has configured both globally and per-room when we have the ability
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to do such things.
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"""
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if ev['user_id'] == self.user_name:
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# let's assume you probably know about messages you sent yourself
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defer.returnValue(['dont_notify'])
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rawrules = yield self.store.get_push_rules_for_user(self.user_name)
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rules = []
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for rawrule in rawrules:
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rule = dict(rawrule)
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rule['conditions'] = json.loads(rawrule['conditions'])
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rule['actions'] = json.loads(rawrule['actions'])
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rules.append(rule)
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enabled_map = yield self.store.get_push_rules_enabled_for_user(self.user_name)
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user = UserID.from_string(self.user_name)
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rules = baserules.list_with_base_rules(rules, user)
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room_id = ev['room_id']
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# get *our* member event for display name matching
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my_display_name = None
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our_member_event = yield self.store.get_current_state(
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room_id=room_id,
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event_type='m.room.member',
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state_key=self.user_name,
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)
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if our_member_event:
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my_display_name = our_member_event[0].content.get("displayname")
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room_members = yield self.store.get_users_in_room(room_id)
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room_member_count = len(room_members)
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for r in rules:
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if r['rule_id'] in enabled_map:
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r['enabled'] = enabled_map[r['rule_id']]
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elif 'enabled' not in r:
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r['enabled'] = True
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if not r['enabled']:
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continue
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matches = True
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conditions = r['conditions']
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actions = r['actions']
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for c in conditions:
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matches &= self._event_fulfills_condition(
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ev, c, display_name=my_display_name,
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room_member_count=room_member_count
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)
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logger.debug(
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"Rule %s %s",
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r['rule_id'], "matches" if matches else "doesn't match"
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)
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# ignore rules with no actions (we have an explict 'dont_notify')
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if len(actions) == 0:
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logger.warn(
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"Ignoring rule id %s with no actions for user %s",
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r['rule_id'], self.user_name
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)
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continue
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if matches:
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logger.info(
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"%s matches for user %s, event %s",
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r['rule_id'], self.user_name, ev['event_id']
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)
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defer.returnValue(actions)
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logger.info(
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"No rules match for user %s, event %s",
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self.user_name, ev['event_id']
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)
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defer.returnValue(Pusher.DEFAULT_ACTIONS)
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@staticmethod
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def _glob_to_regexp(glob):
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r = re.escape(glob)
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r = re.sub(r'\\\*', r'.*?', r)
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r = re.sub(r'\\\?', r'.', r)
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# handle [abc], [a-z] and [!a-z] style ranges.
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r = re.sub(r'\\\[(\\\!|)(.*)\\\]',
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lambda x: ('[%s%s]' % (x.group(1) and '^' or '',
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re.sub(r'\\\-', '-', x.group(2)))), r)
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return r
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def _event_fulfills_condition(self, ev, condition, display_name, room_member_count):
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if condition['kind'] == 'event_match':
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if 'pattern' not in condition:
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logger.warn("event_match condition with no pattern")
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return False
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# XXX: optimisation: cache our pattern regexps
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if condition['key'] == 'content.body':
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r = r'\b%s\b' % self._glob_to_regexp(condition['pattern'])
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else:
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r = r'^%s$' % self._glob_to_regexp(condition['pattern'])
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val = _value_for_dotted_key(condition['key'], ev)
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if val is None:
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return False
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return re.search(r, val, flags=re.IGNORECASE) is not None
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elif condition['kind'] == 'device':
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if 'profile_tag' not in condition:
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return True
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return condition['profile_tag'] == self.profile_tag
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elif condition['kind'] == 'contains_display_name':
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# This is special because display names can be different
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# between rooms and so you can't really hard code it in a rule.
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# Optimisation: we should cache these names and update them from
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# the event stream.
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if 'content' not in ev or 'body' not in ev['content']:
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return False
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if not display_name:
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return False
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return re.search(
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"\b%s\b" % re.escape(display_name), ev['content']['body'],
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flags=re.IGNORECASE
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) is not None
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elif condition['kind'] == 'room_member_count':
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if 'is' not in condition:
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return False
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m = Pusher.INEQUALITY_EXPR.match(condition['is'])
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if not m:
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return False
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ineq = m.group(1)
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rhs = m.group(2)
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if not rhs.isdigit():
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return False
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rhs = int(rhs)
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if ineq == '' or ineq == '==':
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return room_member_count == rhs
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elif ineq == '<':
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return room_member_count < rhs
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elif ineq == '>':
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return room_member_count > rhs
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elif ineq == '>=':
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return room_member_count >= rhs
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elif ineq == '<=':
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return room_member_count <= rhs
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else:
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return False
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else:
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return True
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@defer.inlineCallbacks
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def get_context_for_event(self, ev):
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name_aliases = yield self.store.get_room_name_and_aliases(
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ev['room_id']
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)
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ctx = {'aliases': name_aliases[1]}
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if name_aliases[0] is not None:
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ctx['name'] = name_aliases[0]
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their_member_events_for_room = yield self.store.get_current_state(
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room_id=ev['room_id'],
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event_type='m.room.member',
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state_key=ev['user_id']
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)
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for mev in their_member_events_for_room:
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if mev.content['membership'] == 'join' and 'displayname' in mev.content:
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dn = mev.content['displayname']
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if dn is not None:
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ctx['sender_display_name'] = dn
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defer.returnValue(ctx)
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@defer.inlineCallbacks
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def start(self):
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if not self.last_token:
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# First-time setup: get a token to start from (we can't
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# just start from no token, ie. 'now'
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# because we need the result to be reproduceable in case
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# we fail to dispatch the push)
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config = PaginationConfig(from_token=None, limit='1')
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chunk = yield self.evStreamHandler.get_stream(
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self.user_name, config, timeout=0, affect_presence=False,
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only_room_events=True
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)
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self.last_token = chunk['end']
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self.store.update_pusher_last_token(
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self.app_id, self.pushkey, self.user_name, self.last_token
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)
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logger.info("Pusher %s for user %s starting from token %s",
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self.pushkey, self.user_name, self.last_token)
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wait = 0
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while self.alive:
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try:
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if wait > 0:
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yield synapse.util.async.sleep(wait)
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yield self.get_and_dispatch()
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wait = 0
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except:
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if wait == 0:
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wait = 1
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else:
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wait = min(wait * 2, 1800)
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logger.exception(
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"Exception in pusher loop for pushkey %s. Pausing for %ds",
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self.pushkey, wait
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)
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@defer.inlineCallbacks
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def get_and_dispatch(self):
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from_tok = StreamToken.from_string(self.last_token)
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config = PaginationConfig(from_token=from_tok, limit='1')
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timeout = (300 + random.randint(-60, 60)) * 1000
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chunk = yield self.evStreamHandler.get_stream(
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self.user_name, config, timeout=timeout, affect_presence=False,
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only_room_events=True
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)
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# limiting to 1 may get 1 event plus 1 presence event, so
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# pick out the actual event
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single_event = None
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for c in chunk['chunk']:
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if 'event_id' in c: # Hmmm...
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single_event = c
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break
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if not single_event:
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self.last_token = chunk['end']
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logger.debug("Event stream timeout for pushkey %s", self.pushkey)
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yield self.store.update_pusher_last_token(
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self.app_id,
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self.pushkey,
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self.user_name,
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self.last_token
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)
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return
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if not self.alive:
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return
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processed = False
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actions = yield self._actions_for_event(single_event)
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tweaks = _tweaks_for_actions(actions)
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if len(actions) == 0:
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logger.warn("Empty actions! Using default action.")
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actions = Pusher.DEFAULT_ACTIONS
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if 'notify' not in actions and 'dont_notify' not in actions:
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logger.warn("Neither notify nor dont_notify in actions: adding default")
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actions.extend(Pusher.DEFAULT_ACTIONS)
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if 'dont_notify' in actions:
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logger.debug(
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"%s for %s: dont_notify",
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single_event['event_id'], self.user_name
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)
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processed = True
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else:
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rejected = yield self.dispatch_push(single_event, tweaks)
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self.has_unread = True
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if isinstance(rejected, list) or isinstance(rejected, tuple):
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processed = True
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for pk in rejected:
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if pk != self.pushkey:
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# for sanity, we only remove the pushkey if it
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# was the one we actually sent...
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logger.warn(
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("Ignoring rejected pushkey %s because we"
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" didn't send it"), pk
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)
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else:
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logger.info(
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"Pushkey %s was rejected: removing",
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pk
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)
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yield self.hs.get_pusherpool().remove_pusher(
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self.app_id, pk, self.user_name
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)
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if not self.alive:
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return
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if processed:
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self.backoff_delay = Pusher.INITIAL_BACKOFF
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self.last_token = chunk['end']
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yield self.store.update_pusher_last_token_and_success(
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self.app_id,
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self.pushkey,
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self.user_name,
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self.last_token,
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self.clock.time_msec()
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)
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if self.failing_since:
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self.failing_since = None
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yield self.store.update_pusher_failing_since(
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self.app_id,
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self.pushkey,
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self.user_name,
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self.failing_since)
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else:
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if not self.failing_since:
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self.failing_since = self.clock.time_msec()
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yield self.store.update_pusher_failing_since(
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self.app_id,
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self.pushkey,
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self.user_name,
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self.failing_since
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)
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if (self.failing_since and
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self.failing_since <
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self.clock.time_msec() - Pusher.GIVE_UP_AFTER):
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# we really only give up so that if the URL gets
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# fixed, we don't suddenly deliver a load
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# of old notifications.
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logger.warn("Giving up on a notification to user %s, "
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"pushkey %s",
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self.user_name, self.pushkey)
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self.backoff_delay = Pusher.INITIAL_BACKOFF
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self.last_token = chunk['end']
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yield self.store.update_pusher_last_token(
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self.app_id,
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self.pushkey,
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self.user_name,
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self.last_token
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)
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self.failing_since = None
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yield self.store.update_pusher_failing_since(
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self.app_id,
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self.pushkey,
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self.user_name,
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self.failing_since
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)
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else:
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logger.warn("Failed to dispatch push for user %s "
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"(failing for %dms)."
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"Trying again in %dms",
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self.user_name,
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self.clock.time_msec() - self.failing_since,
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self.backoff_delay)
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yield synapse.util.async.sleep(self.backoff_delay / 1000.0)
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self.backoff_delay *= 2
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if self.backoff_delay > Pusher.MAX_BACKOFF:
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self.backoff_delay = Pusher.MAX_BACKOFF
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def stop(self):
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self.alive = False
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def dispatch_push(self, p, tweaks):
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"""
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Overridden by implementing classes to actually deliver the notification
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Args:
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p: The event to notify for as a single event from the event stream
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Returns: If the notification was delivered, an array containing any
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pushkeys that were rejected by the push gateway.
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False if the notification could not be delivered (ie.
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should be retried).
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"""
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pass
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def reset_badge_count(self):
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pass
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def presence_changed(self, state):
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"""
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We clear badge counts whenever a user's last_active time is bumped
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This is by no means perfect but I think it's the best we can do
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without read receipts.
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"""
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if 'last_active' in state.state:
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last_active = state.state['last_active']
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if last_active > self.last_last_active_time:
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self.last_last_active_time = last_active
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if self.has_unread:
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logger.info("Resetting badge count for %s", self.user_name)
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self.reset_badge_count()
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self.has_unread = False
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def _value_for_dotted_key(dotted_key, event):
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parts = dotted_key.split(".")
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val = event
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while len(parts) > 0:
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if parts[0] not in val:
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return None
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val = val[parts[0]]
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parts = parts[1:]
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return val
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def _tweaks_for_actions(actions):
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tweaks = {}
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for a in actions:
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if not isinstance(a, dict):
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continue
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if 'set_tweak' in a and 'value' in a:
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tweaks[a['set_tweak']] = a['value']
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return tweaks
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class PusherConfigException(Exception):
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def __init__(self, msg):
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super(PusherConfigException, self).__init__(msg)
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