diff --git a/synapse/handlers/__init__.py b/synapse/handlers/__init__.py
index 87b4d381c7..6a2339f2eb 100644
--- a/synapse/handlers/__init__.py
+++ b/synapse/handlers/__init__.py
@@ -17,7 +17,7 @@ from synapse.appservice.scheduler import AppServiceScheduler
from synapse.appservice.api import ApplicationServiceApi
from .register import RegistrationHandler
from .room import (
- RoomCreationHandler, RoomMemberHandler, RoomListHandler
+ RoomCreationHandler, RoomMemberHandler, RoomListHandler, RoomContextHandler,
)
from .message import MessageHandler
from .events import EventStreamHandler, EventHandler
@@ -70,3 +70,4 @@ class Handlers(object):
self.auth_handler = AuthHandler(hs)
self.identity_handler = IdentityHandler(hs)
self.search_handler = SearchHandler(hs)
+ self.room_context_handler = RoomContextHandler(hs)
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index 60f9fa58b0..dd93a5d04d 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -33,6 +33,7 @@ from collections import OrderedDict
from unpaddedbase64 import decode_base64
import logging
+import math
import string
logger = logging.getLogger(__name__)
@@ -747,6 +748,47 @@ class RoomListHandler(BaseHandler):
defer.returnValue({"start": "START", "end": "END", "chunk": chunk})
+class RoomContextHandler(BaseHandler):
+ @defer.inlineCallbacks
+ def get_event_context(self, user, room_id, event_id, limit):
+ before_limit = math.floor(limit/2.)
+ after_limit = limit - before_limit
+
+ now_token = yield self.hs.get_event_sources().get_current_token()
+
+ results = yield self.store.get_events_around(
+ room_id, event_id, before_limit, after_limit
+ )
+
+ results["events_before"] = yield self._filter_events_for_client(
+ user.to_string(), results["events_before"]
+ )
+
+ results["events_after"] = yield self._filter_events_for_client(
+ user.to_string(), results["events_after"]
+ )
+
+ if results["events_after"]:
+ last_event_id = results["events_after"][-1].event_id
+ else:
+ last_event_id = event_id
+
+ state = yield self.store.get_state_for_events(
+ [last_event_id], None
+ )
+ results["state"] = state[last_event_id].values()
+
+ results["start"] = now_token.copy_and_replace(
+ "room_key", results["start"]
+ ).to_string()
+
+ results["end"] = now_token.copy_and_replace(
+ "room_key", results["end"]
+ ).to_string()
+
+ defer.returnValue(results)
+
+
class RoomEventSource(object):
def __init__(self, hs):
self.store = hs.get_datastore()
diff --git a/synapse/rest/client/v1/room.py b/synapse/rest/client/v1/room.py
index 4cee1c1599..2dcaee86cd 100644
--- a/synapse/rest/client/v1/room.py
+++ b/synapse/rest/client/v1/room.py
@@ -397,6 +397,41 @@ class RoomTriggerBackfill(ClientV1RestServlet):
defer.returnValue((200, res))
+class RoomEventContext(ClientV1RestServlet):
+ PATTERN = client_path_pattern(
+ "/rooms/(?P<room_id>[^/]*)/context/(?P<event_id>[^/]*)$"
+ )
+
+ def __init__(self, hs):
+ super(RoomEventContext, self).__init__(hs)
+ self.clock = hs.get_clock()
+
+ @defer.inlineCallbacks
+ def on_GET(self, request, room_id, event_id):
+ user, _ = yield self.auth.get_user_by_req(request)
+
+ limit = int(request.args.get("limit", [10])[0])
+
+ results = yield self.handlers.room_context_handler.get_event_context(
+ user, room_id, event_id, limit,
+ )
+
+ time_now = self.clock.time_msec()
+ results["events_before"] = [
+ serialize_event(event, time_now) for event in results["events_before"]
+ ]
+ results["events_after"] = [
+ serialize_event(event, time_now) for event in results["events_after"]
+ ]
+ results["state"] = [
+ serialize_event(event, time_now) for event in results["state"]
+ ]
+
+ logger.info("Responding with %r", results)
+
+ defer.returnValue((200, results))
+
+
# TODO: Needs unit testing
class RoomMembershipRestServlet(ClientV1RestServlet):
@@ -628,3 +663,4 @@ def register_servlets(hs, http_server):
RoomRedactEventRestServlet(hs).register(http_server)
RoomTypingRestServlet(hs).register(http_server)
SearchRestServlet(hs).register(http_server)
+ RoomEventContext(hs).register(http_server)
diff --git a/synapse/storage/stream.py b/synapse/storage/stream.py
index 3cab06fdef..f2eecf52f9 100644
--- a/synapse/storage/stream.py
+++ b/synapse/storage/stream.py
@@ -23,7 +23,7 @@ paginate bacwards.
This is implemented by keeping two ordering columns: stream_ordering and
topological_ordering. Stream ordering is basically insertion/received order
-(except for events from backfill requests). The topolgical_ordering is a
+(except for events from backfill requests). The topological_ordering is a
weak ordering of events based on the pdu graph.
This means that we have to have two different types of tokens, depending on
@@ -436,3 +436,112 @@ class StreamStore(SQLBaseStore):
internal = event.internal_metadata
internal.before = str(RoomStreamToken(topo, stream - 1))
internal.after = str(RoomStreamToken(topo, stream))
+
+ @defer.inlineCallbacks
+ def get_events_around(self, room_id, event_id, before_limit, after_limit):
+ results = yield self.runInteraction(
+ "get_events_around", self._get_events_around_txn,
+ room_id, event_id, before_limit, after_limit
+ )
+
+ events_before = yield self._get_events(
+ [e for e in results["before"]["event_ids"]],
+ get_prev_content=True
+ )
+
+ events_after = yield self._get_events(
+ [e for e in results["after"]["event_ids"]],
+ get_prev_content=True
+ )
+
+ defer.returnValue({
+ "events_before": events_before,
+ "events_after": events_after,
+ "start": results["before"]["token"],
+ "end": results["after"]["token"],
+ })
+
+ def _get_events_around_txn(self, txn, room_id, event_id, before_limit, after_limit):
+ results = self._simple_select_one_txn(
+ txn,
+ "events",
+ keyvalues={
+ "event_id": event_id,
+ "room_id": room_id,
+ },
+ retcols=["stream_ordering", "topological_ordering"],
+ )
+
+ stream_ordering = results["stream_ordering"]
+ topological_ordering = results["topological_ordering"]
+
+ query_before = (
+ "SELECT topological_ordering, stream_ordering, event_id FROM events"
+ " WHERE room_id = ? AND (topological_ordering < ?"
+ " OR (topological_ordering = ? AND stream_ordering < ?))"
+ " ORDER BY topological_ordering DESC, stream_ordering DESC"
+ " LIMIT ?"
+ )
+
+ query_after = (
+ "SELECT topological_ordering, stream_ordering, event_id FROM events"
+ " WHERE room_id = ? AND (topological_ordering > ?"
+ " OR (topological_ordering = ? AND stream_ordering > ?))"
+ " ORDER BY topological_ordering ASC, stream_ordering ASC"
+ " LIMIT ?"
+ )
+
+ txn.execute(
+ query_before,
+ (
+ room_id, topological_ordering, topological_ordering,
+ stream_ordering, before_limit,
+ )
+ )
+
+ rows = self.cursor_to_dict(txn)
+ events_before = [r["event_id"] for r in rows]
+
+ if rows:
+ start_token = str(RoomStreamToken(
+ rows[0]["topological_ordering"],
+ rows[0]["stream_ordering"] - 1,
+ ))
+ else:
+ start_token = str(RoomStreamToken(
+ topological_ordering,
+ stream_ordering - 1,
+ ))
+
+ txn.execute(
+ query_after,
+ (
+ room_id, topological_ordering, topological_ordering,
+ stream_ordering, after_limit,
+ )
+ )
+
+ rows = self.cursor_to_dict(txn)
+ events_after = [r["event_id"] for r in rows]
+
+ if rows:
+ end_token = str(RoomStreamToken(
+ rows[-1]["topological_ordering"],
+ rows[-1]["stream_ordering"],
+ ))
+ else:
+ end_token = str(RoomStreamToken(
+ topological_ordering,
+ stream_ordering,
+ ))
+
+ return {
+ "before": {
+ "event_ids": events_before,
+ "token": start_token,
+ },
+ "after": {
+ "event_ids": events_after,
+ "token": end_token,
+ },
+ }
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