Merge branch 'develop' of github.com:matrix-org/synapse into erikj/split_federation

7 files changed, 272 insertions, 34 deletions

diff --git a/synapse/storage/__init__.py b/synapse/storage/__init__.py
index 134e4a80f1..23b4a8d76d 100644
--- a/synapse/storage/__init__.py
+++ b/synapse/storage/__init__.py
@@ -39,6 +39,7 @@ from .filtering import FilteringStore
 from .group_server import GroupServerStore
 from .keys import KeyStore
 from .media_repository import MediaRepositoryStore
+from .monthly_active_users import MonthlyActiveUsersStore
 from .openid import OpenIdStore
 from .presence import PresenceStore, UserPresenceState
 from .profile import ProfileStore
@@ -87,6 +88,7 @@ class DataStore(RoomMemberStore, RoomStore,
                 UserDirectoryStore,
                 GroupServerStore,
                 UserErasureStore,
+                MonthlyActiveUsersStore,
                 ):
 
     def __init__(self, db_conn, hs):
@@ -94,7 +96,6 @@ class DataStore(RoomMemberStore, RoomStore,
         self._clock = hs.get_clock()
         self.database_engine = hs.database_engine
 
-        self.db_conn = db_conn
         self._stream_id_gen = StreamIdGenerator(
             db_conn, "events", "stream_ordering",
             extra_tables=[("local_invites", "stream_id")]
@@ -267,31 +268,6 @@ class DataStore(RoomMemberStore, RoomStore,
 
         return self.runInteraction("count_users", _count_users)
 
-    def count_monthly_users(self):
-        """Counts the number of users who used this homeserver in the last 30 days
-
-        This method should be refactored with count_daily_users - the only
-        reason not to is waiting on definition of mau
-
-        Returns:
-            Defered[int]
-        """
-        def _count_monthly_users(txn):
-            thirty_days_ago = int(self._clock.time_msec()) - (1000 * 60 * 60 * 24 * 30)
-            sql = """
-                SELECT COALESCE(count(*), 0) FROM (
-                    SELECT user_id FROM user_ips
-                    WHERE last_seen > ?
-                    GROUP BY user_id
-                ) u
-            """
-
-            txn.execute(sql, (thirty_days_ago,))
-            count, = txn.fetchone()
-            return count
-
-        return self.runInteraction("count_monthly_users", _count_monthly_users)
-
     def count_r30_users(self):
         """
         Counts the number of 30 day retained users, defined as:-
diff --git a/synapse/storage/client_ips.py b/synapse/storage/client_ips.py
index b8cefd43d6..2489527f2c 100644
--- a/synapse/storage/client_ips.py
+++ b/synapse/storage/client_ips.py
@@ -35,6 +35,7 @@ LAST_SEEN_GRANULARITY = 120 * 1000
 
 class ClientIpStore(background_updates.BackgroundUpdateStore):
     def __init__(self, db_conn, hs):
+
         self.client_ip_last_seen = Cache(
             name="client_ip_last_seen",
             keylen=4,
@@ -74,6 +75,7 @@ class ClientIpStore(background_updates.BackgroundUpdateStore):
             "before", "shutdown", self._update_client_ips_batch
         )
 
+    @defer.inlineCallbacks
     def insert_client_ip(self, user_id, access_token, ip, user_agent, device_id,
                          now=None):
         if not now:
@@ -84,7 +86,7 @@ class ClientIpStore(background_updates.BackgroundUpdateStore):
             last_seen = self.client_ip_last_seen.get(key)
         except KeyError:
             last_seen = None
-
+        yield self.populate_monthly_active_users(user_id)
         # Rate-limited inserts
         if last_seen is not None and (now - last_seen) < LAST_SEEN_GRANULARITY:
             return
diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index 5374796fd7..ccfda5b0fa 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -485,9 +485,14 @@ class EventsStore(EventFederationStore, EventsWorkerStore, BackgroundUpdateStore
                     new_forward_extremeties=new_forward_extremeties,
                 )
                 persist_event_counter.inc(len(chunk))
-                synapse.metrics.event_persisted_position.set(
-                    chunk[-1][0].internal_metadata.stream_ordering,
-                )
+
+                if not backfilled:
+                    # backfilled events have negative stream orderings, so we don't
+                    # want to set the event_persisted_position to that.
+                    synapse.metrics.event_persisted_position.set(
+                        chunk[-1][0].internal_metadata.stream_ordering,
+                    )
+
                 for event, context in chunk:
                     if context.app_service:
                         origin_type = "local"
diff --git a/synapse/storage/monthly_active_users.py b/synapse/storage/monthly_active_users.py
new file mode 100644
index 0000000000..d47dcef3a0
--- /dev/null
+++ b/synapse/storage/monthly_active_users.py
@@ -0,0 +1,201 @@
+# -*- coding: utf-8 -*-
+# Copyright 2018 New Vector
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import logging
+
+from twisted.internet import defer
+
+from synapse.util.caches.descriptors import cached
+
+from ._base import SQLBaseStore
+
+logger = logging.getLogger(__name__)
+
+# Number of msec of granularity to store the monthly_active_user timestamp
+# This means it is not necessary to update the table on every request
+LAST_SEEN_GRANULARITY = 60 * 60 * 1000
+
+
+class MonthlyActiveUsersStore(SQLBaseStore):
+    def __init__(self, dbconn, hs):
+        super(MonthlyActiveUsersStore, self).__init__(None, hs)
+        self._clock = hs.get_clock()
+        self.hs = hs
+        self.reserved_users = ()
+
+    @defer.inlineCallbacks
+    def initialise_reserved_users(self, threepids):
+        # TODO Why can't I do this in init?
+        store = self.hs.get_datastore()
+        reserved_user_list = []
+
+        # Do not add more reserved users than the total allowable number
+        for tp in threepids[:self.hs.config.max_mau_value]:
+            user_id = yield store.get_user_id_by_threepid(
+                tp["medium"], tp["address"]
+            )
+            if user_id:
+                self.upsert_monthly_active_user(user_id)
+                reserved_user_list.append(user_id)
+            else:
+                logger.warning(
+                    "mau limit reserved threepid %s not found in db" % tp
+                )
+        self.reserved_users = tuple(reserved_user_list)
+
+    @defer.inlineCallbacks
+    def reap_monthly_active_users(self):
+        """
+        Cleans out monthly active user table to ensure that no stale
+        entries exist.
+
+        Returns:
+            Deferred[]
+        """
+        def _reap_users(txn):
+
+            thirty_days_ago = (
+                int(self._clock.time_msec()) - (1000 * 60 * 60 * 24 * 30)
+            )
+            # Purge stale users
+
+            # questionmarks is a hack to overcome sqlite not supporting
+            # tuples in 'WHERE IN %s'
+            questionmarks = '?' * len(self.reserved_users)
+            query_args = [thirty_days_ago]
+            query_args.extend(self.reserved_users)
+
+            sql = """
+                DELETE FROM monthly_active_users
+                WHERE timestamp < ?
+                AND user_id NOT IN ({})
+                """.format(','.join(questionmarks))
+
+            txn.execute(sql, query_args)
+
+            # If MAU user count still exceeds the MAU threshold, then delete on
+            # a least recently active basis.
+            # Note it is not possible to write this query using OFFSET due to
+            # incompatibilities in how sqlite and postgres support the feature.
+            # sqlite requires 'LIMIT -1 OFFSET ?', the LIMIT must be present
+            # While Postgres does not require 'LIMIT', but also does not support
+            # negative LIMIT values. So there is no way to write it that both can
+            # support
+            query_args = [self.hs.config.max_mau_value]
+            query_args.extend(self.reserved_users)
+            sql = """
+                DELETE FROM monthly_active_users
+                WHERE user_id NOT IN (
+                    SELECT user_id FROM monthly_active_users
+                    ORDER BY timestamp DESC
+                    LIMIT ?
+                    )
+                AND user_id NOT IN ({})
+                """.format(','.join(questionmarks))
+            txn.execute(sql, query_args)
+
+        yield self.runInteraction("reap_monthly_active_users", _reap_users)
+        # It seems poor to invalidate the whole cache, Postgres supports
+        # 'Returning' which would allow me to invalidate only the
+        # specific users, but sqlite has no way to do this and instead
+        # I would need to SELECT and the DELETE which without locking
+        # is racy.
+        # Have resolved to invalidate the whole cache for now and do
+        # something about it if and when the perf becomes significant
+        self._user_last_seen_monthly_active.invalidate_all()
+        self.get_monthly_active_count.invalidate_all()
+
+    @cached(num_args=0)
+    def get_monthly_active_count(self):
+        """Generates current count of monthly active users
+
+        Returns:
+            Defered[int]: Number of current monthly active users
+        """
+
+        def _count_users(txn):
+            sql = "SELECT COALESCE(count(*), 0) FROM monthly_active_users"
+
+            txn.execute(sql)
+            count, = txn.fetchone()
+            return count
+        return self.runInteraction("count_users", _count_users)
+
+    def upsert_monthly_active_user(self, user_id):
+        """
+            Updates or inserts monthly active user member
+            Arguments:
+                user_id (str): user to add/update
+            Deferred[bool]: True if a new entry was created, False if an
+                existing one was updated.
+        """
+        is_insert = self._simple_upsert(
+            desc="upsert_monthly_active_user",
+            table="monthly_active_users",
+            keyvalues={
+                "user_id": user_id,
+            },
+            values={
+                "timestamp": int(self._clock.time_msec()),
+            },
+            lock=False,
+        )
+        if is_insert:
+            self._user_last_seen_monthly_active.invalidate((user_id,))
+            self.get_monthly_active_count.invalidate(())
+
+    @cached(num_args=1)
+    def _user_last_seen_monthly_active(self, user_id):
+        """
+            Checks if a given user is part of the monthly active user group
+            Arguments:
+                user_id (str): user to add/update
+            Return:
+                Deferred[int] : timestamp since last seen, None if never seen
+
+        """
+
+        return(self._simple_select_one_onecol(
+            table="monthly_active_users",
+            keyvalues={
+                "user_id": user_id,
+            },
+            retcol="timestamp",
+            allow_none=True,
+            desc="_user_last_seen_monthly_active",
+        ))
+
+    @defer.inlineCallbacks
+    def populate_monthly_active_users(self, user_id):
+        """Checks on the state of monthly active user limits and optionally
+        add the user to the monthly active tables
+
+        Args:
+            user_id(str): the user_id to query
+        """
+        if self.hs.config.limit_usage_by_mau:
+            last_seen_timestamp = yield self._user_last_seen_monthly_active(user_id)
+            now = self.hs.get_clock().time_msec()
+
+            # We want to reduce to the total number of db writes, and are happy
+            # to trade accuracy of timestamp in order to lighten load. This means
+            # We always insert new users (where MAU threshold has not been reached),
+            # but only update if we have not previously seen the user for
+            # LAST_SEEN_GRANULARITY ms
+            if last_seen_timestamp is None:
+                count = yield self.get_monthly_active_count()
+                if count < self.hs.config.max_mau_value:
+                    yield self.upsert_monthly_active_user(user_id)
+            elif now - last_seen_timestamp > LAST_SEEN_GRANULARITY:
+                yield self.upsert_monthly_active_user(user_id)
diff --git a/synapse/storage/prepare_database.py b/synapse/storage/prepare_database.py
index b290f834b3..b364719312 100644
--- a/synapse/storage/prepare_database.py
+++ b/synapse/storage/prepare_database.py
@@ -25,7 +25,7 @@ logger = logging.getLogger(__name__)
 
 # Remember to update this number every time a change is made to database
 # schema files, so the users will be informed on server restarts.
-SCHEMA_VERSION = 50
+SCHEMA_VERSION = 51
 
 dir_path = os.path.abspath(os.path.dirname(__file__))
 
diff --git a/synapse/storage/schema/delta/51/monthly_active_users.sql b/synapse/storage/schema/delta/51/monthly_active_users.sql
new file mode 100644
index 0000000000..c9d537d5a3
--- /dev/null
+++ b/synapse/storage/schema/delta/51/monthly_active_users.sql
@@ -0,0 +1,27 @@
+/* Copyright 2018 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+-- a table of monthly active users, for use where blocking based on mau limits
+CREATE TABLE monthly_active_users (
+    user_id TEXT NOT NULL,
+    -- Last time we saw the user. Not guaranteed to be accurate due to rate limiting
+    -- on updates, Granularity of updates governed by
+    -- synapse.storage.monthly_active_users.LAST_SEEN_GRANULARITY
+    -- Measured in ms since epoch.
+    timestamp BIGINT NOT NULL
+);
+
+CREATE UNIQUE INDEX monthly_active_users_users ON monthly_active_users(user_id);
+CREATE INDEX monthly_active_users_time_stamp ON monthly_active_users(timestamp);
diff --git a/synapse/storage/state.py b/synapse/storage/state.py
index b27b3ae144..17b14d464b 100644
--- a/synapse/storage/state.py
+++ b/synapse/storage/state.py
@@ -21,15 +21,17 @@ from six.moves import range
 
 from twisted.internet import defer
 
+from synapse.api.constants import EventTypes
+from synapse.api.errors import NotFoundError
+from synapse.storage._base import SQLBaseStore
 from synapse.storage.background_updates import BackgroundUpdateStore
 from synapse.storage.engines import PostgresEngine
+from synapse.storage.events_worker import EventsWorkerStore
 from synapse.util.caches import get_cache_factor_for, intern_string
 from synapse.util.caches.descriptors import cached, cachedList
 from synapse.util.caches.dictionary_cache import DictionaryCache
 from synapse.util.stringutils import to_ascii
 
-from ._base import SQLBaseStore
-
 logger = logging.getLogger(__name__)
 
 
@@ -46,7 +48,8 @@ class _GetStateGroupDelta(namedtuple("_GetStateGroupDelta", ("prev_group", "delt
         return len(self.delta_ids) if self.delta_ids else 0
 
 
-class StateGroupWorkerStore(SQLBaseStore):
+# this inherits from EventsWorkerStore because it calls self.get_events
+class StateGroupWorkerStore(EventsWorkerStore, SQLBaseStore):
     """The parts of StateGroupStore that can be called from workers.
     """
 
@@ -61,6 +64,30 @@ class StateGroupWorkerStore(SQLBaseStore):
             "*stateGroupCache*", 500000 * get_cache_factor_for("stateGroupCache")
         )
 
+    @defer.inlineCallbacks
+    def get_room_version(self, room_id):
+        """Get the room_version of a given room
+
+        Args:
+            room_id (str)
+
+        Returns:
+            Deferred[str]
+
+        Raises:
+            NotFoundError if the room is unknown
+        """
+        # for now we do this by looking at the create event. We may want to cache this
+        # more intelligently in future.
+        state_ids = yield self.get_current_state_ids(room_id)
+        create_id = state_ids.get((EventTypes.Create, ""))
+
+        if not create_id:
+            raise NotFoundError("Unknown room")
+
+        create_event = yield self.get_event(create_id)
+        defer.returnValue(create_event.content.get("room_version", "1"))
+
     @cached(max_entries=100000, iterable=True)
     def get_current_state_ids(self, room_id):
         """Get the current state event ids for a room based on the