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Merge pull request #350 from matrix-org/erikj/search
Implement pagination, order by and groups in search
This commit is contained in:
Erik Johnston
commit
6be1b4b113
@ -22,6 +22,8 @@ from synapse.api.filtering import Filter
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from synapse.api.errors import SynapseError
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from synapse.events.utils import serialize_event
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from unpaddedbase64 import decode_base64, encode_base64
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import logging
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@ -34,27 +36,59 @@ class SearchHandler(BaseHandler):
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super(SearchHandler, self).__init__(hs)
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@defer.inlineCallbacks
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def search(self, user, content):
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def search(self, user, content, batch=None):
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"""Performs a full text search for a user.
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Args:
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user (UserID)
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content (dict): Search parameters
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batch (str): 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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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)
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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:
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raise SynapseError(400, "Invalid batch")
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try:
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search_term = content["search_categories"]["room_events"]["search_term"]
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keys = content["search_categories"]["room_events"].get("keys", [
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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("keys", [
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"content.body", "content.name", "content.topic",
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])
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filter_dict = content["search_categories"]["room_events"].get("filter", {})
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event_context = content["search_categories"]["room_events"].get(
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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 doen)
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order_by = room_cat.get("order_by", "rank")
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# Include context around each event?
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event_context = room_cat.get(
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"event_context", None
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)
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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(
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"before_limit", 5
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@ -65,6 +99,15 @@ class SearchHandler(BaseHandler):
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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" % (set(group_keys) - {"room_id", "sender"},)
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)
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search_filter = Filter(filter_dict)
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# TODO: Search through left rooms too
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@ -77,19 +120,130 @@ class SearchHandler(BaseHandler):
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room_ids = search_filter.filter_rooms(room_ids)
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rank_map, event_map, _ = yield self.store.search_msgs(
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room_ids, search_term, keys
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)
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if batch_group == "room_id":
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room_ids.intersection_update({batch_group_key})
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filtered_events = search_filter.filter(event_map.values())
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rank_map = {} # event_id -> rank of event
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allowed_events = []
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room_groups = {} # Holds result of grouping by room, if applicable
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sender_group = {} # Holds result of grouping by sender, if applicable
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allowed_events = yield self._filter_events_for_client(
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user.to_string(), filtered_events
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)
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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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allowed_events.sort(key=lambda e: -rank_map[e.event_id])
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allowed_events = allowed_events[:search_filter.limit()]
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if order_by == "rank":
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results = yield self.store.search_msgs(
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room_ids, search_term, keys
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)
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results_map = {r["event"].event_id: r for r in results}
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rank_map.update({r["event"].event_id: r["rank"] for r in results})
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filtered_events = search_filter.filter([r["event"] for r in results])
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events = yield self._filter_events_for_client(
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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(e.room_id, {
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"results": [],
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"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(e.sender, {
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"results": [],
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"order": rank_map[e.event_id],
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})
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s["results"].append(e.event_id)
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elif order_by == "recent":
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# In this case we specifically loop through each room as the given
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# limit applies to each room, rather than a global list.
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# This is not necessarilly a good idea.
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for room_id in room_ids:
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room_events = []
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if batch_group == "room_id" and batch_group_key == room_id:
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pagination_token = batch_token
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else:
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pagination_token = None
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i = 0
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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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results = yield self.store.search_room(
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room_id, search_term, keys, search_filter.limit() * 2,
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pagination_token=pagination_token,
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)
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results_map = {r["event"].event_id: r for r in results}
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rank_map.update({r["event"].event_id: r["rank"] for r in results})
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filtered_events = search_filter.filter([
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r["event"] for r in results
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])
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events = yield self._filter_events_for_client(
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user.to_string(), filtered_events
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)
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room_events.extend(events)
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room_events = room_events[:search_filter.limit()]
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if len(results) < search_filter.limit() * 2:
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pagination_token = None
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break
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else:
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pagination_token = results[-1]["pagination_token"]
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if room_events:
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res = results_map[room_events[-1].event_id]
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pagination_token = res["pagination_token"]
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group = room_groups.setdefault(room_id, {})
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if pagination_token:
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next_batch = encode_base64("%s\n%s\n%s" % (
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"room_id", room_id, pagination_token
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))
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group["next_batch"] = next_batch
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if batch_token:
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global_next_batch = next_batch
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group["results"] = [e.event_id for e in room_events]
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group["order"] = max(
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e.origin_server_ts/1000 for e in room_events
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if hasattr(e, "origin_server_ts")
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)
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allowed_events.extend(room_events)
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# Normalize the group orders
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if room_groups:
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if len(room_groups) > 1:
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mx = max(g["order"] for g in room_groups.values())
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mn = min(g["order"] for g in room_groups.values())
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for g in room_groups.values():
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g["order"] = (g["order"] - mn) * 1.0 / (mx - mn)
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else:
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room_groups.values()[0]["order"] = 1
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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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# 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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now_token = yield self.hs.get_event_sources().get_current_token()
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@ -144,11 +298,22 @@ class SearchHandler(BaseHandler):
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logger.info("Found %d results", len(results))
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rooms_cat_res = {
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"results": results,
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"count": len(results)
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}
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if room_groups and "room_id" in group_keys:
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rooms_cat_res.setdefault("groups", {})["room_id"] = 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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defer.returnValue({
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"search_categories": {
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"room_events": {
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"results": results,
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"count": len(results)
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}
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"room_events": rooms_cat_res
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}
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})
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@ -600,7 +600,8 @@ class SearchRestServlet(ClientV1RestServlet):
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content = _parse_json(request)
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results = yield self.handlers.search_handler.search(auth_user, content)
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batch = request.args.get("next_batch", [None])[0]
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results = yield self.handlers.search_handler.search(auth_user, content, batch)
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defer.returnValue((200, results))
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@ -16,18 +16,13 @@
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from twisted.internet import defer
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from _base import SQLBaseStore
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from synapse.api.errors import SynapseError
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from synapse.storage.engines import PostgresEngine, Sqlite3Engine
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from collections import namedtuple
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import logging
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"""The result of a search.
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Fields:
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rank_map (dict): Mapping event_id -> rank
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event_map (dict): Mapping event_id -> event
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pagination_token (str): Pagination token
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"""
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SearchResult = namedtuple("SearchResult", ("rank_map", "event_map", "pagination_token"))
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logger = logging.getLogger(__name__)
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class SearchStore(SQLBaseStore):
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@ -42,7 +37,7 @@ class SearchStore(SQLBaseStore):
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"content.body", "content.name", "content.topic"
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Returns:
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SearchResult
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list of dicts
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"""
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clauses = []
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args = []
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@ -100,12 +95,103 @@ class SearchStore(SQLBaseStore):
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for ev in events
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}
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defer.returnValue(SearchResult(
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defer.returnValue([
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{
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r["event_id"]: r["rank"]
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for r in results
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if r["event_id"] in event_map
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},
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event_map,
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None
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))
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"event": event_map[r["event_id"]],
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"rank": r["rank"],
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}
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for r in results
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if r["event_id"] in event_map
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])
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@defer.inlineCallbacks
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def search_room(self, room_id, search_term, keys, limit, pagination_token=None):
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"""Performs a full text search over events with given keys.
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Args:
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room_id (str): The room_id to search in
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search_term (str): Search term to search for
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keys (list): List of keys to search in, currently supports
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"content.body", "content.name", "content.topic"
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pagination_token (str): A pagination token previously returned
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Returns:
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list of dicts
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"""
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clauses = []
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args = [search_term, room_id]
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local_clauses = []
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for key in keys:
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local_clauses.append("key = ?")
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args.append(key)
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clauses.append(
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"(%s)" % (" OR ".join(local_clauses),)
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)
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if pagination_token:
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try:
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topo, stream = pagination_token.split(",")
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topo = int(topo)
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stream = int(stream)
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except:
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raise SynapseError(400, "Invalid pagination token")
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clauses.append(
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"(topological_ordering < ?"
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" OR (topological_ordering = ? AND stream_ordering < ?))"
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)
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args.extend([topo, topo, stream])
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if isinstance(self.database_engine, PostgresEngine):
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sql = (
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"SELECT ts_rank_cd(vector, query) as rank,"
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" topological_ordering, stream_ordering, room_id, event_id"
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" FROM plainto_tsquery('english', ?) as query, event_search"
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" NATURAL JOIN events"
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" WHERE vector @@ query AND room_id = ?"
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)
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elif isinstance(self.database_engine, Sqlite3Engine):
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sql = (
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"SELECT rank(matchinfo(event_search)) as rank, room_id, event_id"
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" topological_ordering, stream_ordering"
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" FROM event_search"
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" NATURAL JOIN events"
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" WHERE value MATCH ? AND room_id = ?"
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)
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else:
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# This should be unreachable.
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raise Exception("Unrecognized database engine")
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for clause in clauses:
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sql += " AND " + clause
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# We add an arbitrary limit here to ensure we don't try to pull the
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# entire table from the database.
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sql += " ORDER BY topological_ordering DESC, stream_ordering DESC LIMIT ?"
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args.append(limit)
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results = yield self._execute(
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"search_rooms", self.cursor_to_dict, sql, *args
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)
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events = yield self._get_events([r["event_id"] for r in results])
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event_map = {
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ev.event_id: ev
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for ev in events
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}
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defer.returnValue([
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{
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"event": event_map[r["event_id"]],
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"rank": r["rank"],
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"pagination_token": "%s,%s" % (
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r["topological_ordering"], r["stream_ordering"]
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),
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}
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for r in results
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if r["event_id"] in event_map
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])
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