412 lines
16 KiB
Python
412 lines
16 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015 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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from synapse.http.servlet import parse_integer, parse_string
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from synapse.http.server import request_handler, finish_request
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from twisted.web.resource import Resource
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from twisted.web.server import NOT_DONE_YET
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from twisted.internet import defer
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import ujson as json
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import collections
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import logging
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logger = logging.getLogger(__name__)
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REPLICATION_PREFIX = "/_synapse/replication"
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STREAM_NAMES = (
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("events",),
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("presence",),
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("typing",),
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("receipts",),
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("user_account_data", "room_account_data", "tag_account_data",),
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("backfill",),
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("push_rules",),
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("pushers",),
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("state",),
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)
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class ReplicationResource(Resource):
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"""
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HTTP endpoint for extracting data from synapse.
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The streams of data returned by the endpoint are controlled by the
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parameters given to the API. To return a given stream pass a query
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parameter with a position in the stream to return data from or the
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special value "-1" to return data from the start of the stream.
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If there is no data for any of the supplied streams after the given
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position then the request will block until there is data for one
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of the streams. This allows clients to long-poll this API.
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The possible streams are:
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* "streams": A special stream returing the positions of other streams.
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* "events": The new events seen on the server.
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* "presence": Presence updates.
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* "typing": Typing updates.
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* "receipts": Receipt updates.
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* "user_account_data": Top-level per user account data.
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* "room_account_data: Per room per user account data.
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* "tag_account_data": Per room per user tags.
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* "backfill": Old events that have been backfilled from other servers.
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* "push_rules": Per user changes to push rules.
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* "pushers": Per user changes to their pushers.
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The API takes two additional query parameters:
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* "timeout": How long to wait before returning an empty response.
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* "limit": The maximum number of rows to return for the selected streams.
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The response is a JSON object with keys for each stream with updates. Under
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each key is a JSON object with:
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* "position": The current position of the stream.
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* "field_names": The names of the fields in each row.
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* "rows": The updates as an array of arrays.
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There are a number of ways this API could be used:
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1) To replicate the contents of the backing database to another database.
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2) To be notified when the contents of a shared backing database changes.
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3) To "tail" the activity happening on a server for debugging.
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In the first case the client would track all of the streams and store it's
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own copy of the data.
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In the second case the client might theoretically just be able to follow
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the "streams" stream to track where the other streams are. However in
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practise it will probably need to get the contents of the streams in
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order to expire the any in-memory caches. Whether it gets the contents
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of the streams from this replication API or directly from the backing
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store is a matter of taste.
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In the third case the client would use the "streams" stream to find what
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streams are available and their current positions. Then it can start
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long-polling this replication API for new data on those streams.
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"""
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isLeaf = True
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def __init__(self, hs):
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Resource.__init__(self) # Resource is old-style, so no super()
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self.version_string = hs.version_string
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self.store = hs.get_datastore()
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self.sources = hs.get_event_sources()
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self.presence_handler = hs.get_handlers().presence_handler
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self.typing_handler = hs.get_handlers().typing_notification_handler
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self.notifier = hs.notifier
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def render_GET(self, request):
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self._async_render_GET(request)
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return NOT_DONE_YET
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@defer.inlineCallbacks
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def current_replication_token(self):
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stream_token = yield self.sources.get_current_token()
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backfill_token = yield self.store.get_current_backfill_token()
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push_rules_token, room_stream_token = self.store.get_push_rules_stream_token()
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pushers_token = self.store.get_pushers_stream_token()
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state_token = self.store.get_state_stream_token()
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defer.returnValue(_ReplicationToken(
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room_stream_token,
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int(stream_token.presence_key),
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int(stream_token.typing_key),
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int(stream_token.receipt_key),
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int(stream_token.account_data_key),
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backfill_token,
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push_rules_token,
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pushers_token,
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state_token,
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))
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@request_handler
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@defer.inlineCallbacks
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def _async_render_GET(self, request):
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limit = parse_integer(request, "limit", 100)
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timeout = parse_integer(request, "timeout", 10 * 1000)
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request.setHeader(b"Content-Type", b"application/json")
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request_streams = {
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name: parse_integer(request, name)
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for names in STREAM_NAMES for name in names
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}
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request_streams["streams"] = parse_string(request, "streams")
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def replicate():
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return self.replicate(request_streams, limit)
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result = yield self.notifier.wait_for_replication(replicate, timeout)
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request.write(json.dumps(result, ensure_ascii=False))
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finish_request(request)
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@defer.inlineCallbacks
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def replicate(self, request_streams, limit):
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writer = _Writer()
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current_token = yield self.current_replication_token()
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logger.info("Replicating up to %r", current_token)
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yield self.account_data(writer, current_token, limit, request_streams)
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yield self.events(writer, current_token, limit, request_streams)
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# TODO: implement limit
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yield self.presence(writer, current_token, request_streams)
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yield self.typing(writer, current_token, request_streams)
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yield self.receipts(writer, current_token, limit, request_streams)
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yield self.push_rules(writer, current_token, limit, request_streams)
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yield self.pushers(writer, current_token, limit, request_streams)
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yield self.state(writer, current_token, limit, request_streams)
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self.streams(writer, current_token, request_streams)
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logger.info("Replicated %d rows", writer.total)
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defer.returnValue(writer.finish())
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def streams(self, writer, current_token, request_streams):
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request_token = request_streams.get("streams")
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streams = []
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if request_token is not None:
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if request_token == "-1":
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for names, position in zip(STREAM_NAMES, current_token):
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streams.extend((name, position) for name in names)
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else:
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items = zip(
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STREAM_NAMES,
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current_token,
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_ReplicationToken(request_token)
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)
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for names, current_id, last_id in items:
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if last_id < current_id:
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streams.extend((name, current_id) for name in names)
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if streams:
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writer.write_header_and_rows(
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"streams", streams, ("name", "position"),
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position=str(current_token)
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)
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@defer.inlineCallbacks
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def events(self, writer, current_token, limit, request_streams):
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request_events = request_streams.get("events")
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request_backfill = request_streams.get("backfill")
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if request_events is not None or request_backfill is not None:
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if request_events is None:
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request_events = current_token.events
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if request_backfill is None:
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request_backfill = current_token.backfill
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res = yield self.store.get_all_new_events(
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request_backfill, request_events,
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current_token.backfill, current_token.events,
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limit
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)
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writer.write_header_and_rows("events", res.new_forward_events, (
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"position", "internal", "json", "state_group"
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))
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writer.write_header_and_rows("backfill", res.new_backfill_events, (
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"position", "internal", "json", "state_group"
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))
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writer.write_header_and_rows(
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"forward_ex_outliers", res.forward_ex_outliers,
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("position", "event_id", "state_group")
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)
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writer.write_header_and_rows(
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"backward_ex_outliers", res.backward_ex_outliers,
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("position", "event_id", "state_group")
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)
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writer.write_header_and_rows(
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"state_resets", res.state_resets, ("position",)
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)
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@defer.inlineCallbacks
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def presence(self, writer, current_token, request_streams):
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current_position = current_token.presence
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request_presence = request_streams.get("presence")
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if request_presence is not None:
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presence_rows = yield self.presence_handler.get_all_presence_updates(
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request_presence, current_position
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)
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writer.write_header_and_rows("presence", presence_rows, (
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"position", "user_id", "state", "last_active_ts",
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"last_federation_update_ts", "last_user_sync_ts",
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"status_msg", "currently_active",
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))
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@defer.inlineCallbacks
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def typing(self, writer, current_token, request_streams):
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current_position = current_token.presence
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request_typing = request_streams.get("typing")
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if request_typing is not None:
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typing_rows = yield self.typing_handler.get_all_typing_updates(
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request_typing, current_position
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)
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writer.write_header_and_rows("typing", typing_rows, (
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"position", "room_id", "typing"
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))
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@defer.inlineCallbacks
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def receipts(self, writer, current_token, limit, request_streams):
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current_position = current_token.receipts
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request_receipts = request_streams.get("receipts")
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if request_receipts is not None:
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receipts_rows = yield self.store.get_all_updated_receipts(
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request_receipts, current_position, limit
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)
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writer.write_header_and_rows("receipts", receipts_rows, (
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"position", "room_id", "receipt_type", "user_id", "event_id", "data"
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))
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@defer.inlineCallbacks
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def account_data(self, writer, current_token, limit, request_streams):
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current_position = current_token.account_data
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user_account_data = request_streams.get("user_account_data")
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room_account_data = request_streams.get("room_account_data")
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tag_account_data = request_streams.get("tag_account_data")
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if user_account_data is not None or room_account_data is not None:
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if user_account_data is None:
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user_account_data = current_position
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if room_account_data is None:
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room_account_data = current_position
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user_rows, room_rows = yield self.store.get_all_updated_account_data(
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user_account_data, room_account_data, current_position, limit
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)
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writer.write_header_and_rows("user_account_data", user_rows, (
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"position", "user_id", "type", "content"
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))
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writer.write_header_and_rows("room_account_data", room_rows, (
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"position", "user_id", "room_id", "type", "content"
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))
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if tag_account_data is not None:
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tag_rows = yield self.store.get_all_updated_tags(
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tag_account_data, current_position, limit
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)
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writer.write_header_and_rows("tag_account_data", tag_rows, (
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"position", "user_id", "room_id", "tags"
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))
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@defer.inlineCallbacks
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def push_rules(self, writer, current_token, limit, request_streams):
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current_position = current_token.push_rules
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push_rules = request_streams.get("push_rules")
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if push_rules is not None:
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rows = yield self.store.get_all_push_rule_updates(
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push_rules, current_position, limit
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)
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writer.write_header_and_rows("push_rules", rows, (
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"position", "event_stream_ordering", "user_id", "rule_id", "op",
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"priority_class", "priority", "conditions", "actions"
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))
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@defer.inlineCallbacks
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def pushers(self, writer, current_token, limit, request_streams):
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current_position = current_token.pushers
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pushers = request_streams.get("pushers")
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if pushers is not None:
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updated, deleted = yield self.store.get_all_updated_pushers(
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pushers, current_position, limit
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)
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writer.write_header_and_rows("pushers", updated, (
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"position", "user_id", "access_token", "profile_tag", "kind",
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"app_id", "app_display_name", "device_display_name", "pushkey",
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"ts", "lang", "data"
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))
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writer.write_header_and_rows("deleted", deleted, (
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"position", "user_id", "app_id", "pushkey"
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))
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@defer.inlineCallbacks
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def state(self, writer, current_token, limit, request_streams):
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current_position = current_token.state
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state = request_streams.get("state")
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if state is not None:
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state_groups, state_group_state = (
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yield self.store.get_all_new_state_groups(
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state, current_position, limit
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)
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)
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writer.write_header_and_rows("state_groups", state_groups, (
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"position", "room_id", "event_id"
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))
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writer.write_header_and_rows("state_group_state", state_group_state, (
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"position", "type", "state_key", "event_id"
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))
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class _Writer(object):
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"""Writes the streams as a JSON object as the response to the request"""
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def __init__(self):
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self.streams = {}
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self.total = 0
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def write_header_and_rows(self, name, rows, fields, position=None):
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if not rows:
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return
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if position is None:
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position = rows[-1][0]
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self.streams[name] = {
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"position": str(position),
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"field_names": fields,
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"rows": rows,
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}
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self.total += len(rows)
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def finish(self):
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return self.streams
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class _ReplicationToken(collections.namedtuple("_ReplicationToken", (
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"events", "presence", "typing", "receipts", "account_data", "backfill",
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"push_rules", "pushers", "state"
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))):
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__slots__ = []
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def __new__(cls, *args):
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if len(args) == 1:
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streams = [int(value) for value in args[0].split("_")]
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if len(streams) < len(cls._fields):
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streams.extend([0] * (len(cls._fields) - len(streams)))
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return cls(*streams)
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else:
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return super(_ReplicationToken, cls).__new__(cls, *args)
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def __str__(self):
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return "_".join(str(value) for value in self)
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