mirror of
https://git.anonymousland.org/anonymousland/synapse.git
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c66a06ac6b
This is in preparation for having multiple data stores that offer different functionality, e.g. splitting out state or event storage.
102 lines
3.2 KiB
Python
102 lines
3.2 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 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 six
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from unpaddedbase64 import encode_base64
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from twisted.internet import defer
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from synapse.crypto.event_signing import compute_event_reference_hash
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from synapse.storage._base import SQLBaseStore
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from synapse.util.caches.descriptors import cached, cachedList
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# py2 sqlite has buffer hardcoded as only binary type, so we must use it,
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# despite being deprecated and removed in favor of memoryview
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if six.PY2:
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db_binary_type = six.moves.builtins.buffer
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else:
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db_binary_type = memoryview
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class SignatureWorkerStore(SQLBaseStore):
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@cached()
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def get_event_reference_hash(self, event_id):
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# This is a dummy function to allow get_event_reference_hashes
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# to use its cache
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raise NotImplementedError()
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@cachedList(
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cached_method_name="get_event_reference_hash", list_name="event_ids", num_args=1
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)
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def get_event_reference_hashes(self, event_ids):
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def f(txn):
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return {
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event_id: self._get_event_reference_hashes_txn(txn, event_id)
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for event_id in event_ids
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}
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return self.runInteraction("get_event_reference_hashes", f)
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@defer.inlineCallbacks
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def add_event_hashes(self, event_ids):
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hashes = yield self.get_event_reference_hashes(event_ids)
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hashes = {
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e_id: {k: encode_base64(v) for k, v in h.items() if k == "sha256"}
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for e_id, h in hashes.items()
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}
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return list(hashes.items())
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def _get_event_reference_hashes_txn(self, txn, event_id):
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"""Get all the hashes for a given PDU.
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Args:
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txn (cursor):
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event_id (str): Id for the Event.
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Returns:
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A dict[unicode, bytes] of algorithm -> hash.
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"""
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query = (
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"SELECT algorithm, hash"
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" FROM event_reference_hashes"
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" WHERE event_id = ?"
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)
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txn.execute(query, (event_id,))
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return {k: v for k, v in txn}
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class SignatureStore(SignatureWorkerStore):
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"""Persistence for event signatures and hashes"""
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def _store_event_reference_hashes_txn(self, txn, events):
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"""Store a hash for a PDU
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Args:
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txn (cursor):
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events (list): list of Events.
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"""
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vals = []
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for event in events:
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ref_alg, ref_hash_bytes = compute_event_reference_hash(event)
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vals.append(
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{
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"event_id": event.event_id,
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"algorithm": ref_alg,
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"hash": db_binary_type(ref_hash_bytes),
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}
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)
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self._simple_insert_many_txn(txn, table="event_reference_hashes", values=vals)
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