245 lines
8.2 KiB
Python
245 lines
8.2 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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import logging
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from twisted.internet import defer
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from synapse.api.errors import StoreError
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from synapse.appservice import ApplicationService
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from ._base import SQLBaseStore
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logger = logging.getLogger(__name__)
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class ApplicationServiceCache(object):
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"""Caches ApplicationServices and provides utility functions on top.
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This class is designed to be invoked on incoming events in order to avoid
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hammering the database every time to extract a list of application service
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regexes.
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"""
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def __init__(self):
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self.services = []
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class ApplicationServiceStore(SQLBaseStore):
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def __init__(self, hs):
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super(ApplicationServiceStore, self).__init__(hs)
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self.cache = ApplicationServiceCache()
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self.cache_defer = self._populate_cache()
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@defer.inlineCallbacks
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def unregister_app_service(self, token):
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"""Unregisters this service.
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This removes all AS specific regex and the base URL. The token is the
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only thing preserved for future registration attempts.
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"""
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yield self.cache_defer # make sure the cache is ready
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yield self.runInteraction(
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"unregister_app_service",
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self._unregister_app_service_txn,
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token,
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)
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# update cache TODO: Should this be in the txn?
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for service in self.cache.services:
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if service.token == token:
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service.url = None
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service.namespaces = None
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service.hs_token = None
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def _unregister_app_service_txn(self, txn, token):
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# kill the url to prevent pushes
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txn.execute(
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"UPDATE application_services SET url=NULL WHERE token=?",
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(token,)
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)
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# cleanup regex
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as_id = self._get_as_id_txn(txn, token)
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if not as_id:
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logger.warning(
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"unregister_app_service_txn: Failed to find as_id for token=",
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token
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)
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return False
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txn.execute(
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"DELETE FROM application_services_regex WHERE as_id=?",
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(as_id,)
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)
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return True
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@defer.inlineCallbacks
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def update_app_service(self, service):
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"""Update an application service, clobbering what was previously there.
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Args:
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service(ApplicationService): The updated service.
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"""
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yield self.cache_defer # make sure the cache is ready
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# NB: There is no "insert" since we provide no public-facing API to
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# allocate new ASes. It relies on the server admin inserting the AS
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# token into the database manually.
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if not service.token or not service.url:
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raise StoreError(400, "Token and url must be specified.")
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if not service.hs_token:
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raise StoreError(500, "No HS token")
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yield self.runInteraction(
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"update_app_service",
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self._update_app_service_txn,
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service
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)
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# update cache TODO: Should this be in the txn?
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for (index, cache_service) in enumerate(self.cache.services):
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if service.token == cache_service.token:
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self.cache.services[index] = service
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logger.info("Updated: %s", service)
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return
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# new entry
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self.cache.services.append(service)
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logger.info("Updated(new): %s", service)
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def _update_app_service_txn(self, txn, service):
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as_id = self._get_as_id_txn(txn, service.token)
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if not as_id:
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logger.warning(
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"update_app_service_txn: Failed to find as_id for token=",
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service.token
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)
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return False
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txn.execute(
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"UPDATE application_services SET url=?, hs_token=? WHERE id=?",
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(service.url, service.hs_token, as_id,)
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)
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# cleanup regex
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txn.execute(
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"DELETE FROM application_services_regex WHERE as_id=?",
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(as_id,)
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)
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for (ns_int, ns_str) in enumerate(ApplicationService.NS_LIST):
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if ns_str in service.namespaces:
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for regex in service.namespaces[ns_str]:
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txn.execute(
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"INSERT INTO application_services_regex("
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"as_id, namespace, regex) values(?,?,?)",
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(as_id, ns_int, regex)
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)
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return True
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def _get_as_id_txn(self, txn, token):
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cursor = txn.execute(
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"SELECT id FROM application_services WHERE token=?",
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(token,)
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)
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res = cursor.fetchone()
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if res:
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return res[0]
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@defer.inlineCallbacks
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def get_app_services(self):
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yield self.cache_defer # make sure the cache is ready
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defer.returnValue(self.cache.services)
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@defer.inlineCallbacks
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def get_app_service_by_token(self, token, from_cache=True):
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"""Get the application service with the given token.
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Args:
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token (str): The application service token.
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from_cache (bool): True to get this service from the cache, False to
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check the database.
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Raises:
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StoreError if there was a problem retrieving this service.
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"""
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yield self.cache_defer # make sure the cache is ready
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if from_cache:
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for service in self.cache.services:
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if service.token == token:
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defer.returnValue(service)
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return
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defer.returnValue(None)
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# TODO: The from_cache=False impl
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# TODO: This should be JOINed with the application_services_regex table.
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@defer.inlineCallbacks
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def _populate_cache(self):
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"""Populates the ApplicationServiceCache from the database."""
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sql = ("SELECT * FROM application_services LEFT JOIN "
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"application_services_regex ON application_services.id = "
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"application_services_regex.as_id")
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# SQL results in the form:
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# [
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# {
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# 'regex': "something",
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# 'url': "something",
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# 'namespace': enum,
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# 'as_id': 0,
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# 'token': "something",
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# 'hs_token': "otherthing",
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# 'id': 0
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# }
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# ]
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services = {}
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results = yield self._execute_and_decode(sql)
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for res in results:
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as_token = res["token"]
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if as_token not in services:
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# add the service
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services[as_token] = {
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"url": res["url"],
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"token": as_token,
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"hs_token": res["hs_token"],
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"namespaces": {
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ApplicationService.NS_USERS: [],
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ApplicationService.NS_ALIASES: [],
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ApplicationService.NS_ROOMS: []
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}
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}
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# add the namespace regex if one exists
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ns_int = res["namespace"]
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if ns_int is None:
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continue
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try:
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services[as_token]["namespaces"][
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ApplicationService.NS_LIST[ns_int]].append(
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res["regex"]
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)
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except IndexError:
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logger.error("Bad namespace enum '%s'. %s", ns_int, res)
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# TODO get last successful txn id f.e. service
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for service in services.values():
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logger.info("Found application service: %s", service)
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self.cache.services.append(ApplicationService(
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token=service["token"],
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url=service["url"],
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namespaces=service["namespaces"],
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hs_token=service["hs_token"]
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))
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