Merge branch 'release-v0.9.0' of github.com:matrix-org/synapse v0.9.0

1 files changed, 391 insertions, 0 deletions

diff --git a/synapse/storage/events.py b/synapse/storage/events.py
new file mode 100644
index 0000000000..38395c66ab
--- /dev/null
+++ b/synapse/storage/events.py
@@ -0,0 +1,391 @@
+# -*- coding: utf-8 -*-
+# Copyright 2014, 2015 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 _base import SQLBaseStore, _RollbackButIsFineException
+
+from twisted.internet import defer
+
+from synapse.util.logutils import log_function
+from synapse.api.constants import EventTypes
+from synapse.crypto.event_signing import compute_event_reference_hash
+
+from syutil.base64util import decode_base64
+from syutil.jsonutil import encode_canonical_json
+
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+class EventsStore(SQLBaseStore):
+    @defer.inlineCallbacks
+    @log_function
+    def persist_event(self, event, context, backfilled=False,
+                      is_new_state=True, current_state=None):
+        stream_ordering = None
+        if backfilled:
+            if not self.min_token_deferred.called:
+                yield self.min_token_deferred
+            self.min_token -= 1
+            stream_ordering = self.min_token
+
+        try:
+            yield self.runInteraction(
+                "persist_event",
+                self._persist_event_txn,
+                event=event,
+                context=context,
+                backfilled=backfilled,
+                stream_ordering=stream_ordering,
+                is_new_state=is_new_state,
+                current_state=current_state,
+            )
+        except _RollbackButIsFineException:
+            pass
+
+    @defer.inlineCallbacks
+    def get_event(self, event_id, check_redacted=True,
+                  get_prev_content=False, allow_rejected=False,
+                  allow_none=False):
+        """Get an event from the database by event_id.
+
+        Args:
+            event_id (str): The event_id of the event to fetch
+            check_redacted (bool): If True, check if event has been redacted
+                and redact it.
+            get_prev_content (bool): If True and event is a state event,
+                include the previous states content in the unsigned field.
+            allow_rejected (bool): If True return rejected events.
+            allow_none (bool): If True, return None if no event found, if
+                False throw an exception.
+
+        Returns:
+            Deferred : A FrozenEvent.
+        """
+        event = yield self.runInteraction(
+            "get_event", self._get_event_txn,
+            event_id,
+            check_redacted=check_redacted,
+            get_prev_content=get_prev_content,
+            allow_rejected=allow_rejected,
+        )
+
+        if not event and not allow_none:
+            raise RuntimeError("Could not find event %s" % (event_id,))
+
+        defer.returnValue(event)
+
+    @log_function
+    def _persist_event_txn(self, txn, event, context, backfilled,
+                           stream_ordering=None, is_new_state=True,
+                           current_state=None):
+
+        # Remove the any existing cache entries for the event_id
+        txn.call_after(self._invalidate_get_event_cache, event.event_id)
+
+        if stream_ordering is None:
+            with self._stream_id_gen.get_next_txn(txn) as stream_ordering:
+                return self._persist_event_txn(
+                    txn, event, context, backfilled,
+                    stream_ordering=stream_ordering,
+                    is_new_state=is_new_state,
+                    current_state=current_state,
+                )
+
+        # We purposefully do this first since if we include a `current_state`
+        # key, we *want* to update the `current_state_events` table
+        if current_state:
+            self._simple_delete_txn(
+                txn,
+                table="current_state_events",
+                keyvalues={"room_id": event.room_id},
+            )
+
+            for s in current_state:
+                if s.type == EventTypes.Member:
+                    txn.call_after(
+                        self.get_rooms_for_user.invalidate, s.state_key
+                    )
+                    txn.call_after(
+                        self.get_joined_hosts_for_room.invalidate, s.room_id
+                    )
+                self._simple_insert_txn(
+                    txn,
+                    "current_state_events",
+                    {
+                        "event_id": s.event_id,
+                        "room_id": s.room_id,
+                        "type": s.type,
+                        "state_key": s.state_key,
+                    }
+                )
+
+        outlier = event.internal_metadata.is_outlier()
+
+        if not outlier:
+            self._store_state_groups_txn(txn, event, context)
+
+            self._update_min_depth_for_room_txn(
+                txn,
+                event.room_id,
+                event.depth
+            )
+
+        have_persisted = self._simple_select_one_onecol_txn(
+            txn,
+            table="event_json",
+            keyvalues={"event_id": event.event_id},
+            retcol="event_id",
+            allow_none=True,
+        )
+
+        metadata_json = encode_canonical_json(
+            event.internal_metadata.get_dict()
+        ).decode("UTF-8")
+
+        # If we have already persisted this event, we don't need to do any
+        # more processing.
+        # The processing above must be done on every call to persist event,
+        # since they might not have happened on previous calls. For example,
+        # if we are persisting an event that we had persisted as an outlier,
+        # but is no longer one.
+        if have_persisted:
+            if not outlier:
+                sql = (
+                    "UPDATE event_json SET internal_metadata = ?"
+                    " WHERE event_id = ?"
+                )
+                txn.execute(
+                    sql,
+                    (metadata_json, event.event_id,)
+                )
+
+                sql = (
+                    "UPDATE events SET outlier = ?"
+                    " WHERE event_id = ?"
+                )
+                txn.execute(
+                    sql,
+                    (False, event.event_id,)
+                )
+            return
+
+        self._handle_prev_events(
+            txn,
+            outlier=outlier,
+            event_id=event.event_id,
+            prev_events=event.prev_events,
+            room_id=event.room_id,
+        )
+
+        if event.type == EventTypes.Member:
+            self._store_room_member_txn(txn, event)
+        elif event.type == EventTypes.Name:
+            self._store_room_name_txn(txn, event)
+        elif event.type == EventTypes.Topic:
+            self._store_room_topic_txn(txn, event)
+        elif event.type == EventTypes.Redaction:
+            self._store_redaction(txn, event)
+
+        event_dict = {
+            k: v
+            for k, v in event.get_dict().items()
+            if k not in [
+                "redacted",
+                "redacted_because",
+            ]
+        }
+
+        self._simple_insert_txn(
+            txn,
+            table="event_json",
+            values={
+                "event_id": event.event_id,
+                "room_id": event.room_id,
+                "internal_metadata": metadata_json,
+                "json": encode_canonical_json(event_dict).decode("UTF-8"),
+            },
+        )
+
+        content = encode_canonical_json(
+            event.content
+        ).decode("UTF-8")
+
+        vals = {
+            "topological_ordering": event.depth,
+            "event_id": event.event_id,
+            "type": event.type,
+            "room_id": event.room_id,
+            "content": content,
+            "processed": True,
+            "outlier": outlier,
+            "depth": event.depth,
+        }
+
+        unrec = {
+            k: v
+            for k, v in event.get_dict().items()
+            if k not in vals.keys() and k not in [
+                "redacted",
+                "redacted_because",
+                "signatures",
+                "hashes",
+                "prev_events",
+            ]
+        }
+
+        vals["unrecognized_keys"] = encode_canonical_json(
+            unrec
+        ).decode("UTF-8")
+
+        sql = (
+            "INSERT INTO events"
+            " (stream_ordering, topological_ordering, event_id, type,"
+            " room_id, content, processed, outlier, depth)"
+            " VALUES (?,?,?,?,?,?,?,?,?)"
+        )
+
+        txn.execute(
+            sql,
+            (
+                stream_ordering, event.depth, event.event_id, event.type,
+                event.room_id, content, True, outlier, event.depth
+            )
+        )
+
+        if context.rejected:
+            self._store_rejections_txn(
+                txn, event.event_id, context.rejected
+            )
+
+        for hash_alg, hash_base64 in event.hashes.items():
+            hash_bytes = decode_base64(hash_base64)
+            self._store_event_content_hash_txn(
+                txn, event.event_id, hash_alg, hash_bytes,
+            )
+
+        for prev_event_id, prev_hashes in event.prev_events:
+            for alg, hash_base64 in prev_hashes.items():
+                hash_bytes = decode_base64(hash_base64)
+                self._store_prev_event_hash_txn(
+                    txn, event.event_id, prev_event_id, alg,
+                    hash_bytes
+                )
+
+        self._simple_insert_many_txn(
+            txn,
+            table="event_auth",
+            values=[
+                {
+                    "event_id": event.event_id,
+                    "room_id": event.room_id,
+                    "auth_id": auth_id,
+                }
+                for auth_id, _ in event.auth_events
+            ],
+        )
+
+        (ref_alg, ref_hash_bytes) = compute_event_reference_hash(event)
+        self._store_event_reference_hash_txn(
+            txn, event.event_id, ref_alg, ref_hash_bytes
+        )
+
+        if event.is_state():
+            vals = {
+                "event_id": event.event_id,
+                "room_id": event.room_id,
+                "type": event.type,
+                "state_key": event.state_key,
+            }
+
+            # TODO: How does this work with backfilling?
+            if hasattr(event, "replaces_state"):
+                vals["prev_state"] = event.replaces_state
+
+            self._simple_insert_txn(
+                txn,
+                "state_events",
+                vals,
+            )
+
+            self._simple_insert_many_txn(
+                txn,
+                table="event_edges",
+                values=[
+                    {
+                        "event_id": event.event_id,
+                        "prev_event_id": e_id,
+                        "room_id": event.room_id,
+                        "is_state": True,
+                    }
+                    for e_id, h in event.prev_state
+                ],
+            )
+
+            if is_new_state and not context.rejected:
+                self._simple_upsert_txn(
+                    txn,
+                    "current_state_events",
+                    keyvalues={
+                        "room_id": event.room_id,
+                        "type": event.type,
+                        "state_key": event.state_key,
+                    },
+                    values={
+                        "event_id": event.event_id,
+                    }
+                )
+
+        return
+
+    def _store_redaction(self, txn, event):
+        # invalidate the cache for the redacted event
+        txn.call_after(self._invalidate_get_event_cache, event.redacts)
+        txn.execute(
+            "INSERT INTO redactions (event_id, redacts) VALUES (?,?)",
+            (event.event_id, event.redacts)
+        )
+
+    def have_events(self, event_ids):
+        """Given a list of event ids, check if we have already processed them.
+
+        Returns:
+            dict: Has an entry for each event id we already have seen. Maps to
+            the rejected reason string if we rejected the event, else maps to
+            None.
+        """
+        if not event_ids:
+            return defer.succeed({})
+
+        def f(txn):
+            sql = (
+                "SELECT e.event_id, reason FROM events as e "
+                "LEFT JOIN rejections as r ON e.event_id = r.event_id "
+                "WHERE e.event_id = ?"
+            )
+
+            res = {}
+            for event_id in event_ids:
+                txn.execute(sql, (event_id,))
+                row = txn.fetchone()
+                if row:
+                    _, rejected = row
+                    res[event_id] = rejected
+
+            return res
+
+        return self.runInteraction(
+            "have_events", f,
+        )