696 lines
24 KiB
Python
696 lines
24 KiB
Python
# Copyright 2015, 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 itertools
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import logging
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from typing import TYPE_CHECKING, Collection, Dict, Iterable, List, Optional, Set, Tuple
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import attr
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from unpaddedbase64 import decode_base64, encode_base64
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from synapse.api.constants import EventTypes, Membership
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from synapse.api.errors import NotFoundError, SynapseError
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from synapse.api.filtering import Filter
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from synapse.events import EventBase
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from synapse.storage.state import StateFilter
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from synapse.types import JsonDict, UserID
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from synapse.visibility import filter_events_for_client
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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@attr.s(slots=True, frozen=True, auto_attribs=True)
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class _SearchResult:
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# The count of results.
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count: int
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# A mapping of event ID to the rank of that event.
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rank_map: Dict[str, int]
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# A list of the resulting events.
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allowed_events: List[EventBase]
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# A map of room ID to results.
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room_groups: Dict[str, JsonDict]
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# A set of event IDs to highlight.
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highlights: Set[str]
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class SearchHandler:
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def __init__(self, hs: "HomeServer"):
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self.store = hs.get_datastores().main
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self.state_handler = hs.get_state_handler()
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self.clock = hs.get_clock()
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self.hs = hs
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self._event_serializer = hs.get_event_client_serializer()
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self._relations_handler = hs.get_relations_handler()
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self.storage = hs.get_storage()
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self.state_store = self.storage.state
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self.auth = hs.get_auth()
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async def get_old_rooms_from_upgraded_room(self, room_id: str) -> Iterable[str]:
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"""Retrieves room IDs of old rooms in the history of an upgraded room.
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We do so by checking the m.room.create event of the room for a
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`predecessor` key. If it exists, we add the room ID to our return
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list and then check that room for a m.room.create event and so on
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until we can no longer find any more previous rooms.
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The full list of all found rooms in then returned.
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Args:
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room_id: id of the room to search through.
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Returns:
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Predecessor room ids
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"""
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historical_room_ids = []
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# The initial room must have been known for us to get this far
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predecessor = await self.store.get_room_predecessor(room_id)
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while True:
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if not predecessor:
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# We have reached the end of the chain of predecessors
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break
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if not isinstance(predecessor.get("room_id"), str):
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# This predecessor object is malformed. Exit here
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break
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predecessor_room_id = predecessor["room_id"]
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# Don't add it to the list until we have checked that we are in the room
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try:
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next_predecessor_room = await self.store.get_room_predecessor(
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predecessor_room_id
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)
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except NotFoundError:
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# The predecessor is not a known room, so we are done here
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break
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historical_room_ids.append(predecessor_room_id)
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# And repeat
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predecessor = next_predecessor_room
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return historical_room_ids
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async def search(
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self, user: UserID, content: JsonDict, batch: Optional[str] = None
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) -> JsonDict:
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"""Performs a full text search for a user.
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Args:
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user: The user performing the search.
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content: Search parameters
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batch: The next_batch parameter. Used for pagination.
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Returns:
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dict to be returned to the client with results of search
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"""
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if not self.hs.config.server.enable_search:
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raise SynapseError(400, "Search is disabled on this homeserver")
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batch_group = None
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batch_group_key = None
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batch_token = None
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if batch:
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try:
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b = decode_base64(batch).decode("ascii")
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batch_group, batch_group_key, batch_token = b.split("\n")
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assert batch_group is not None
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assert batch_group_key is not None
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assert batch_token is not None
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except Exception:
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raise SynapseError(400, "Invalid batch")
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logger.info(
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"Search batch properties: %r, %r, %r",
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batch_group,
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batch_group_key,
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batch_token,
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)
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logger.info("Search content: %s", content)
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try:
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room_cat = content["search_categories"]["room_events"]
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# The actual thing to query in FTS
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search_term = room_cat["search_term"]
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# Which "keys" to search over in FTS query
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keys = room_cat.get(
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"keys", ["content.body", "content.name", "content.topic"]
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)
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# Filter to apply to results
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filter_dict = room_cat.get("filter", {})
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# What to order results by (impacts whether pagination can be done)
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order_by = room_cat.get("order_by", "rank")
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# Return the current state of the rooms?
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include_state = room_cat.get("include_state", False)
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# Include context around each event?
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event_context = room_cat.get("event_context", None)
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before_limit = after_limit = None
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include_profile = False
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# Group results together? May allow clients to paginate within a
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# group
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group_by = room_cat.get("groupings", {}).get("group_by", {})
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group_keys = [g["key"] for g in group_by]
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if event_context is not None:
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before_limit = int(event_context.get("before_limit", 5))
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after_limit = int(event_context.get("after_limit", 5))
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# Return the historic display name and avatar for the senders
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# of the events?
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include_profile = bool(event_context.get("include_profile", False))
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except KeyError:
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raise SynapseError(400, "Invalid search query")
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if order_by not in ("rank", "recent"):
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raise SynapseError(400, "Invalid order by: %r" % (order_by,))
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if set(group_keys) - {"room_id", "sender"}:
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raise SynapseError(
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400,
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"Invalid group by keys: %r"
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% (set(group_keys) - {"room_id", "sender"},),
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)
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return await self._search(
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user,
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batch_group,
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batch_group_key,
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batch_token,
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search_term,
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keys,
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filter_dict,
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order_by,
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include_state,
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group_keys,
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event_context,
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before_limit,
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after_limit,
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include_profile,
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)
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async def _search(
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self,
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user: UserID,
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batch_group: Optional[str],
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batch_group_key: Optional[str],
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batch_token: Optional[str],
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search_term: str,
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keys: List[str],
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filter_dict: JsonDict,
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order_by: str,
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include_state: bool,
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group_keys: List[str],
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event_context: Optional[bool],
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before_limit: Optional[int],
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after_limit: Optional[int],
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include_profile: bool,
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) -> JsonDict:
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"""Performs a full text search for a user.
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Args:
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user: The user performing the search.
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batch_group: Pagination information.
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batch_group_key: Pagination information.
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batch_token: Pagination information.
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search_term: Search term to search for
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keys: List of keys to search in, currently supports
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"content.body", "content.name", "content.topic"
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filter_dict: The JSON to build a filter out of.
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order_by: How to order the results. Valid values ore "rank" and "recent".
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include_state: True if the state of the room at each result should
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be included.
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group_keys: A list of ways to group the results. Valid values are
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"room_id" and "sender".
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event_context: True to include contextual events around results.
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before_limit:
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The number of events before a result to include as context.
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Only used if event_context is True.
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after_limit:
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The number of events after a result to include as context.
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Only used if event_context is True.
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include_profile: True if historical profile information should be
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included in the event context.
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Only used if event_context is True.
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Returns:
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dict to be returned to the client with results of search
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"""
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search_filter = Filter(self.hs, filter_dict)
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# TODO: Search through left rooms too
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rooms = await self.store.get_rooms_for_local_user_where_membership_is(
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user.to_string(),
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membership_list=[Membership.JOIN],
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# membership_list=[Membership.JOIN, Membership.LEAVE, Membership.Ban],
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)
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room_ids = {r.room_id for r in rooms}
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# If doing a subset of all rooms seearch, check if any of the rooms
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# are from an upgraded room, and search their contents as well
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if search_filter.rooms:
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historical_room_ids: List[str] = []
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for room_id in search_filter.rooms:
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# Add any previous rooms to the search if they exist
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ids = await self.get_old_rooms_from_upgraded_room(room_id)
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historical_room_ids += ids
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# Prevent any historical events from being filtered
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search_filter = search_filter.with_room_ids(historical_room_ids)
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room_ids = search_filter.filter_rooms(room_ids)
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if batch_group == "room_id":
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room_ids.intersection_update({batch_group_key})
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if not room_ids:
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return {
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"search_categories": {
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"room_events": {"results": [], "count": 0, "highlights": []}
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}
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}
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sender_group: Optional[Dict[str, JsonDict]]
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if order_by == "rank":
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search_result, sender_group = await self._search_by_rank(
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user, room_ids, search_term, keys, search_filter
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)
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# Unused return values for rank search.
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global_next_batch = None
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elif order_by == "recent":
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search_result, global_next_batch = await self._search_by_recent(
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user,
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room_ids,
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search_term,
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keys,
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search_filter,
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batch_group,
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batch_group_key,
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batch_token,
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)
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# Unused return values for recent search.
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sender_group = None
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else:
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# We should never get here due to the guard earlier.
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raise NotImplementedError()
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logger.info("Found %d events to return", len(search_result.allowed_events))
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# If client has asked for "context" for each event (i.e. some surrounding
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# events and state), fetch that
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if event_context is not None:
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# Note that before and after limit must be set in this case.
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assert before_limit is not None
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assert after_limit is not None
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contexts = await self._calculate_event_contexts(
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user,
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search_result.allowed_events,
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before_limit,
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after_limit,
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include_profile,
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)
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else:
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contexts = {}
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# TODO: Add a limit
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state_results = {}
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if include_state:
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for room_id in {e.room_id for e in search_result.allowed_events}:
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state = await self.state_handler.get_current_state(room_id)
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state_results[room_id] = list(state.values())
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aggregations = await self._relations_handler.get_bundled_aggregations(
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# Generate an iterable of EventBase for all the events that will be
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# returned, including contextual events.
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itertools.chain(
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# The events_before and events_after for each context.
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itertools.chain.from_iterable(
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itertools.chain(context["events_before"], context["events_after"])
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for context in contexts.values()
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),
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# The returned events.
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search_result.allowed_events,
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),
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user.to_string(),
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)
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# We're now about to serialize the events. We should not make any
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# blocking calls after this. Otherwise, the 'age' will be wrong.
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time_now = self.clock.time_msec()
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for context in contexts.values():
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context["events_before"] = self._event_serializer.serialize_events(
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context["events_before"], time_now, bundle_aggregations=aggregations
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)
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context["events_after"] = self._event_serializer.serialize_events(
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context["events_after"], time_now, bundle_aggregations=aggregations
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)
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results = [
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{
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"rank": search_result.rank_map[e.event_id],
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"result": self._event_serializer.serialize_event(
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e, time_now, bundle_aggregations=aggregations
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),
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"context": contexts.get(e.event_id, {}),
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}
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for e in search_result.allowed_events
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]
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rooms_cat_res: JsonDict = {
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"results": results,
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"count": search_result.count,
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"highlights": list(search_result.highlights),
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}
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if state_results:
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rooms_cat_res["state"] = {
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room_id: self._event_serializer.serialize_events(state_events, time_now)
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for room_id, state_events in state_results.items()
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}
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if search_result.room_groups and "room_id" in group_keys:
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rooms_cat_res.setdefault("groups", {})[
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"room_id"
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] = search_result.room_groups
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if sender_group and "sender" in group_keys:
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rooms_cat_res.setdefault("groups", {})["sender"] = sender_group
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if global_next_batch:
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rooms_cat_res["next_batch"] = global_next_batch
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return {"search_categories": {"room_events": rooms_cat_res}}
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async def _search_by_rank(
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self,
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user: UserID,
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room_ids: Collection[str],
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search_term: str,
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keys: Iterable[str],
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search_filter: Filter,
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) -> Tuple[_SearchResult, Dict[str, JsonDict]]:
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"""
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Performs a full text search for a user ordering by rank.
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Args:
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user: The user performing the search.
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room_ids: List of room ids to search in
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search_term: Search term to search for
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keys: List of keys to search in, currently supports
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"content.body", "content.name", "content.topic"
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search_filter: The event filter to use.
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Returns:
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A tuple of:
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The search results.
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A map of sender ID to results.
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"""
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rank_map = {} # event_id -> rank of event
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# Holds result of grouping by room, if applicable
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room_groups: Dict[str, JsonDict] = {}
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# Holds result of grouping by sender, if applicable
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sender_group: Dict[str, JsonDict] = {}
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search_result = await self.store.search_msgs(room_ids, search_term, keys)
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if search_result["highlights"]:
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highlights = search_result["highlights"]
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else:
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highlights = set()
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results = search_result["results"]
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# event_id -> rank of event
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rank_map = {r["event"].event_id: r["rank"] for r in results}
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filtered_events = await search_filter.filter([r["event"] for r in results])
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events = await filter_events_for_client(
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self.storage, user.to_string(), filtered_events
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)
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events.sort(key=lambda e: -rank_map[e.event_id])
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allowed_events = events[: search_filter.limit]
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for e in allowed_events:
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rm = room_groups.setdefault(
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e.room_id, {"results": [], "order": rank_map[e.event_id]}
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)
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rm["results"].append(e.event_id)
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s = sender_group.setdefault(
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e.sender, {"results": [], "order": rank_map[e.event_id]}
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)
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s["results"].append(e.event_id)
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return (
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_SearchResult(
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search_result["count"],
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rank_map,
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allowed_events,
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room_groups,
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highlights,
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),
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sender_group,
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)
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async def _search_by_recent(
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self,
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user: UserID,
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room_ids: Collection[str],
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search_term: str,
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keys: Iterable[str],
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search_filter: Filter,
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batch_group: Optional[str],
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batch_group_key: Optional[str],
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batch_token: Optional[str],
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) -> Tuple[_SearchResult, Optional[str]]:
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"""
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Performs a full text search for a user ordering by recent.
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Args:
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user: The user performing the search.
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room_ids: List of room ids to search in
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search_term: Search term to search for
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keys: List of keys to search in, currently supports
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"content.body", "content.name", "content.topic"
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search_filter: The event filter to use.
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batch_group: Pagination information.
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batch_group_key: Pagination information.
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batch_token: Pagination information.
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Returns:
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A tuple of:
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The search results.
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Optionally, a pagination token.
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"""
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rank_map = {} # event_id -> rank of event
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# Holds result of grouping by room, if applicable
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room_groups: Dict[str, JsonDict] = {}
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# Holds the next_batch for the entire result set if one of those exists
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global_next_batch = None
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highlights = set()
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room_events: List[EventBase] = []
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i = 0
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pagination_token = batch_token
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# We keep looping and we keep filtering until we reach the limit
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# or we run out of things.
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# But only go around 5 times since otherwise synapse will be sad.
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while len(room_events) < search_filter.limit and i < 5:
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i += 1
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search_result = await self.store.search_rooms(
|
|
room_ids,
|
|
search_term,
|
|
keys,
|
|
search_filter.limit * 2,
|
|
pagination_token=pagination_token,
|
|
)
|
|
|
|
if search_result["highlights"]:
|
|
highlights.update(search_result["highlights"])
|
|
|
|
count = search_result["count"]
|
|
|
|
results = search_result["results"]
|
|
|
|
results_map = {r["event"].event_id: r for r in results}
|
|
|
|
rank_map.update({r["event"].event_id: r["rank"] for r in results})
|
|
|
|
filtered_events = await search_filter.filter([r["event"] for r in results])
|
|
|
|
events = await filter_events_for_client(
|
|
self.storage, user.to_string(), filtered_events
|
|
)
|
|
|
|
room_events.extend(events)
|
|
room_events = room_events[: search_filter.limit]
|
|
|
|
if len(results) < search_filter.limit * 2:
|
|
break
|
|
else:
|
|
pagination_token = results[-1]["pagination_token"]
|
|
|
|
for event in room_events:
|
|
group = room_groups.setdefault(event.room_id, {"results": []})
|
|
group["results"].append(event.event_id)
|
|
|
|
if room_events and len(room_events) >= search_filter.limit:
|
|
last_event_id = room_events[-1].event_id
|
|
pagination_token = results_map[last_event_id]["pagination_token"]
|
|
|
|
# We want to respect the given batch group and group keys so
|
|
# that if people blindly use the top level `next_batch` token
|
|
# it returns more from the same group (if applicable) rather
|
|
# than reverting to searching all results again.
|
|
if batch_group and batch_group_key:
|
|
global_next_batch = encode_base64(
|
|
(
|
|
"%s\n%s\n%s" % (batch_group, batch_group_key, pagination_token)
|
|
).encode("ascii")
|
|
)
|
|
else:
|
|
global_next_batch = encode_base64(
|
|
("%s\n%s\n%s" % ("all", "", pagination_token)).encode("ascii")
|
|
)
|
|
|
|
for room_id, group in room_groups.items():
|
|
group["next_batch"] = encode_base64(
|
|
("%s\n%s\n%s" % ("room_id", room_id, pagination_token)).encode(
|
|
"ascii"
|
|
)
|
|
)
|
|
|
|
return (
|
|
_SearchResult(count, rank_map, room_events, room_groups, highlights),
|
|
global_next_batch,
|
|
)
|
|
|
|
async def _calculate_event_contexts(
|
|
self,
|
|
user: UserID,
|
|
allowed_events: List[EventBase],
|
|
before_limit: int,
|
|
after_limit: int,
|
|
include_profile: bool,
|
|
) -> Dict[str, JsonDict]:
|
|
"""
|
|
Calculates the contextual events for any search results.
|
|
|
|
Args:
|
|
user: The user performing the search.
|
|
allowed_events: The search results.
|
|
before_limit:
|
|
The number of events before a result to include as context.
|
|
after_limit:
|
|
The number of events after a result to include as context.
|
|
include_profile: True if historical profile information should be
|
|
included in the event context.
|
|
|
|
Returns:
|
|
A map of event ID to contextual information.
|
|
"""
|
|
now_token = self.hs.get_event_sources().get_current_token()
|
|
|
|
contexts = {}
|
|
for event in allowed_events:
|
|
res = await self.store.get_events_around(
|
|
event.room_id, event.event_id, before_limit, after_limit
|
|
)
|
|
|
|
logger.info(
|
|
"Context for search returned %d and %d events",
|
|
len(res.events_before),
|
|
len(res.events_after),
|
|
)
|
|
|
|
events_before = await filter_events_for_client(
|
|
self.storage, user.to_string(), res.events_before
|
|
)
|
|
|
|
events_after = await filter_events_for_client(
|
|
self.storage, user.to_string(), res.events_after
|
|
)
|
|
|
|
context: JsonDict = {
|
|
"events_before": events_before,
|
|
"events_after": events_after,
|
|
"start": await now_token.copy_and_replace(
|
|
"room_key", res.start
|
|
).to_string(self.store),
|
|
"end": await now_token.copy_and_replace("room_key", res.end).to_string(
|
|
self.store
|
|
),
|
|
}
|
|
|
|
if include_profile:
|
|
senders = {
|
|
ev.sender
|
|
for ev in itertools.chain(events_before, [event], events_after)
|
|
}
|
|
|
|
if events_after:
|
|
last_event_id = events_after[-1].event_id
|
|
else:
|
|
last_event_id = event.event_id
|
|
|
|
state_filter = StateFilter.from_types(
|
|
[(EventTypes.Member, sender) for sender in senders]
|
|
)
|
|
|
|
state = await self.state_store.get_state_for_event(
|
|
last_event_id, state_filter
|
|
)
|
|
|
|
context["profile_info"] = {
|
|
s.state_key: {
|
|
"displayname": s.content.get("displayname", None),
|
|
"avatar_url": s.content.get("avatar_url", None),
|
|
}
|
|
for s in state.values()
|
|
if s.type == EventTypes.Member and s.state_key in senders
|
|
}
|
|
|
|
contexts[event.event_id] = context
|
|
|
|
return contexts
|