anonymousland-synapse/synapse/storage/databases/main/appservice.py
2020-08-05 21:38:57 +01:00

375 lines
13 KiB
Python

# -*- coding: utf-8 -*-
# Copyright 2015, 2016 OpenMarket Ltd
# Copyright 2018 New Vector 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.
import logging
import re
from canonicaljson import json
from twisted.internet import defer
from synapse.appservice import AppServiceTransaction
from synapse.config.appservice import load_appservices
from synapse.storage._base import SQLBaseStore, db_to_json
from synapse.storage.database import DatabasePool
from synapse.storage.databases.main.events_worker import EventsWorkerStore
logger = logging.getLogger(__name__)
def _make_exclusive_regex(services_cache):
# We precompile a regex constructed from all the regexes that the AS's
# have registered for exclusive users.
exclusive_user_regexes = [
regex.pattern
for service in services_cache
for regex in service.get_exclusive_user_regexes()
]
if exclusive_user_regexes:
exclusive_user_regex = "|".join("(" + r + ")" for r in exclusive_user_regexes)
exclusive_user_regex = re.compile(exclusive_user_regex)
else:
# We handle this case specially otherwise the constructed regex
# will always match
exclusive_user_regex = None
return exclusive_user_regex
class ApplicationServiceWorkerStore(SQLBaseStore):
def __init__(self, database: DatabasePool, db_conn, hs):
self.services_cache = load_appservices(
hs.hostname, hs.config.app_service_config_files
)
self.exclusive_user_regex = _make_exclusive_regex(self.services_cache)
super(ApplicationServiceWorkerStore, self).__init__(database, db_conn, hs)
def get_app_services(self):
return self.services_cache
def get_if_app_services_interested_in_user(self, user_id):
"""Check if the user is one associated with an app service (exclusively)
"""
if self.exclusive_user_regex:
return bool(self.exclusive_user_regex.match(user_id))
else:
return False
def get_app_service_by_user_id(self, user_id):
"""Retrieve an application service from their user ID.
All application services have associated with them a particular user ID.
There is no distinguishing feature on the user ID which indicates it
represents an application service. This function allows you to map from
a user ID to an application service.
Args:
user_id(str): The user ID to see if it is an application service.
Returns:
synapse.appservice.ApplicationService or None.
"""
for service in self.services_cache:
if service.sender == user_id:
return service
return None
def get_app_service_by_token(self, token):
"""Get the application service with the given appservice token.
Args:
token (str): The application service token.
Returns:
synapse.appservice.ApplicationService or None.
"""
for service in self.services_cache:
if service.token == token:
return service
return None
def get_app_service_by_id(self, as_id):
"""Get the application service with the given appservice ID.
Args:
as_id (str): The application service ID.
Returns:
synapse.appservice.ApplicationService or None.
"""
for service in self.services_cache:
if service.id == as_id:
return service
return None
class ApplicationServiceStore(ApplicationServiceWorkerStore):
# This is currently empty due to there not being any AS storage functions
# that can't be run on the workers. Since this may change in future, and
# to keep consistency with the other stores, we keep this empty class for
# now.
pass
class ApplicationServiceTransactionWorkerStore(
ApplicationServiceWorkerStore, EventsWorkerStore
):
@defer.inlineCallbacks
def get_appservices_by_state(self, state):
"""Get a list of application services based on their state.
Args:
state(ApplicationServiceState): The state to filter on.
Returns:
A Deferred which resolves to a list of ApplicationServices, which
may be empty.
"""
results = yield self.db_pool.simple_select_list(
"application_services_state", {"state": state}, ["as_id"]
)
# NB: This assumes this class is linked with ApplicationServiceStore
as_list = self.get_app_services()
services = []
for res in results:
for service in as_list:
if service.id == res["as_id"]:
services.append(service)
return services
@defer.inlineCallbacks
def get_appservice_state(self, service):
"""Get the application service state.
Args:
service(ApplicationService): The service whose state to set.
Returns:
A Deferred which resolves to ApplicationServiceState.
"""
result = yield self.db_pool.simple_select_one(
"application_services_state",
{"as_id": service.id},
["state"],
allow_none=True,
desc="get_appservice_state",
)
if result:
return result.get("state")
return None
def set_appservice_state(self, service, state):
"""Set the application service state.
Args:
service(ApplicationService): The service whose state to set.
state(ApplicationServiceState): The connectivity state to apply.
Returns:
A Deferred which resolves when the state was set successfully.
"""
return self.db_pool.simple_upsert(
"application_services_state", {"as_id": service.id}, {"state": state}
)
def create_appservice_txn(self, service, events):
"""Atomically creates a new transaction for this application service
with the given list of events.
Args:
service(ApplicationService): The service who the transaction is for.
events(list<Event>): A list of events to put in the transaction.
Returns:
AppServiceTransaction: A new transaction.
"""
def _create_appservice_txn(txn):
# work out new txn id (highest txn id for this service += 1)
# The highest id may be the last one sent (in which case it is last_txn)
# or it may be the highest in the txns list (which are waiting to be/are
# being sent)
last_txn_id = self._get_last_txn(txn, service.id)
txn.execute(
"SELECT MAX(txn_id) FROM application_services_txns WHERE as_id=?",
(service.id,),
)
highest_txn_id = txn.fetchone()[0]
if highest_txn_id is None:
highest_txn_id = 0
new_txn_id = max(highest_txn_id, last_txn_id) + 1
# Insert new txn into txn table
event_ids = json.dumps([e.event_id for e in events])
txn.execute(
"INSERT INTO application_services_txns(as_id, txn_id, event_ids) "
"VALUES(?,?,?)",
(service.id, new_txn_id, event_ids),
)
return AppServiceTransaction(service=service, id=new_txn_id, events=events)
return self.db_pool.runInteraction(
"create_appservice_txn", _create_appservice_txn
)
def complete_appservice_txn(self, txn_id, service):
"""Completes an application service transaction.
Args:
txn_id(str): The transaction ID being completed.
service(ApplicationService): The application service which was sent
this transaction.
Returns:
A Deferred which resolves if this transaction was stored
successfully.
"""
txn_id = int(txn_id)
def _complete_appservice_txn(txn):
# Debugging query: Make sure the txn being completed is EXACTLY +1 from
# what was there before. If it isn't, we've got problems (e.g. the AS
# has probably missed some events), so whine loudly but still continue,
# since it shouldn't fail completion of the transaction.
last_txn_id = self._get_last_txn(txn, service.id)
if (last_txn_id + 1) != txn_id:
logger.error(
"appservice: Completing a transaction which has an ID > 1 from "
"the last ID sent to this AS. We've either dropped events or "
"sent it to the AS out of order. FIX ME. last_txn=%s "
"completing_txn=%s service_id=%s",
last_txn_id,
txn_id,
service.id,
)
# Set current txn_id for AS to 'txn_id'
self.db_pool.simple_upsert_txn(
txn,
"application_services_state",
{"as_id": service.id},
{"last_txn": txn_id},
)
# Delete txn
self.db_pool.simple_delete_txn(
txn,
"application_services_txns",
{"txn_id": txn_id, "as_id": service.id},
)
return self.db_pool.runInteraction(
"complete_appservice_txn", _complete_appservice_txn
)
@defer.inlineCallbacks
def get_oldest_unsent_txn(self, service):
"""Get the oldest transaction which has not been sent for this
service.
Args:
service(ApplicationService): The app service to get the oldest txn.
Returns:
A Deferred which resolves to an AppServiceTransaction or
None.
"""
def _get_oldest_unsent_txn(txn):
# Monotonically increasing txn ids, so just select the smallest
# one in the txns table (we delete them when they are sent)
txn.execute(
"SELECT * FROM application_services_txns WHERE as_id=?"
" ORDER BY txn_id ASC LIMIT 1",
(service.id,),
)
rows = self.db_pool.cursor_to_dict(txn)
if not rows:
return None
entry = rows[0]
return entry
entry = yield self.db_pool.runInteraction(
"get_oldest_unsent_appservice_txn", _get_oldest_unsent_txn
)
if not entry:
return None
event_ids = db_to_json(entry["event_ids"])
events = yield self.get_events_as_list(event_ids)
return AppServiceTransaction(service=service, id=entry["txn_id"], events=events)
def _get_last_txn(self, txn, service_id):
txn.execute(
"SELECT last_txn FROM application_services_state WHERE as_id=?",
(service_id,),
)
last_txn_id = txn.fetchone()
if last_txn_id is None or last_txn_id[0] is None: # no row exists
return 0
else:
return int(last_txn_id[0]) # select 'last_txn' col
def set_appservice_last_pos(self, pos):
def set_appservice_last_pos_txn(txn):
txn.execute(
"UPDATE appservice_stream_position SET stream_ordering = ?", (pos,)
)
return self.db_pool.runInteraction(
"set_appservice_last_pos", set_appservice_last_pos_txn
)
@defer.inlineCallbacks
def get_new_events_for_appservice(self, current_id, limit):
"""Get all new evnets"""
def get_new_events_for_appservice_txn(txn):
sql = (
"SELECT e.stream_ordering, e.event_id"
" FROM events AS e"
" WHERE"
" (SELECT stream_ordering FROM appservice_stream_position)"
" < e.stream_ordering"
" AND e.stream_ordering <= ?"
" ORDER BY e.stream_ordering ASC"
" LIMIT ?"
)
txn.execute(sql, (current_id, limit))
rows = txn.fetchall()
upper_bound = current_id
if len(rows) == limit:
upper_bound = rows[-1][0]
return upper_bound, [row[1] for row in rows]
upper_bound, event_ids = yield self.db_pool.runInteraction(
"get_new_events_for_appservice", get_new_events_for_appservice_txn
)
events = yield self.get_events_as_list(event_ids)
return upper_bound, events
class ApplicationServiceTransactionStore(ApplicationServiceTransactionWorkerStore):
# This is currently empty due to there not being any AS storage functions
# that can't be run on the workers. Since this may change in future, and
# to keep consistency with the other stores, we keep this empty class for
# now.
pass