Merge pull request #1030 from matrix-org/erikj/cache_contexts

Add concept of cache contexts

7 files changed, 65 insertions, 9 deletions

diff --git a/synapse/storage/_base.py b/synapse/storage/_base.py
index 029f6612e6..49fa8614f2 100644
--- a/synapse/storage/_base.py
+++ b/synapse/storage/_base.py
@@ -166,7 +166,7 @@ class SQLBaseStore(object):
         self._txn_perf_counters = PerformanceCounters()
         self._get_event_counters = PerformanceCounters()
 
-        self._get_event_cache = Cache("*getEvent*", keylen=3, lru=True,
+        self._get_event_cache = Cache("*getEvent*", keylen=3,
                                       max_entries=hs.config.event_cache_size)
 
         self._state_group_cache = DictionaryCache(
diff --git a/synapse/storage/event_push_actions.py b/synapse/storage/event_push_actions.py
index df4000d0da..c65c9c9c47 100644
--- a/synapse/storage/event_push_actions.py
+++ b/synapse/storage/event_push_actions.py
@@ -56,7 +56,7 @@ class EventPushActionsStore(SQLBaseStore):
             )
         self._simple_insert_many_txn(txn, "event_push_actions", values)
 
-    @cachedInlineCallbacks(num_args=3, lru=True, tree=True, max_entries=5000)
+    @cachedInlineCallbacks(num_args=3, tree=True, max_entries=5000)
     def get_unread_event_push_actions_by_room_for_user(
             self, room_id, user_id, last_read_event_id
     ):
diff --git a/synapse/storage/push_rule.py b/synapse/storage/push_rule.py
index 8183b7f1b0..78334a98cf 100644
--- a/synapse/storage/push_rule.py
+++ b/synapse/storage/push_rule.py
@@ -16,6 +16,7 @@
 from ._base import SQLBaseStore
 from synapse.util.caches.descriptors import cachedInlineCallbacks, cachedList
 from synapse.push.baserules import list_with_base_rules
+from synapse.api.constants import EventTypes, Membership
 from twisted.internet import defer
 
 import logging
@@ -48,7 +49,7 @@ def _load_rules(rawrules, enabled_map):
 
 
 class PushRuleStore(SQLBaseStore):
-    @cachedInlineCallbacks(lru=True)
+    @cachedInlineCallbacks()
     def get_push_rules_for_user(self, user_id):
         rows = yield self._simple_select_list(
             table="push_rules",
@@ -72,7 +73,7 @@ class PushRuleStore(SQLBaseStore):
 
         defer.returnValue(rules)
 
-    @cachedInlineCallbacks(lru=True)
+    @cachedInlineCallbacks()
     def get_push_rules_enabled_for_user(self, user_id):
         results = yield self._simple_select_list(
             table="push_rules_enable",
@@ -123,6 +124,61 @@ class PushRuleStore(SQLBaseStore):
 
         defer.returnValue(results)
 
+    def bulk_get_push_rules_for_room(self, room_id, state_group, current_state):
+        if not state_group:
+            # If state_group is None it means it has yet to be assigned a
+            # state group, i.e. we need to make sure that calls with a state_group
+            # of None don't hit previous cached calls with a None state_group.
+            # To do this we set the state_group to a new object as object() != object()
+            state_group = object()
+
+        return self._bulk_get_push_rules_for_room(room_id, state_group, current_state)
+
+    @cachedInlineCallbacks(num_args=2, cache_context=True)
+    def _bulk_get_push_rules_for_room(self, room_id, state_group, current_state,
+                                      cache_context):
+        # We don't use `state_group`, its there so that we can cache based
+        # on it. However, its important that its never None, since two current_state's
+        # with a state_group of None are likely to be different.
+        # See bulk_get_push_rules_for_room for how we work around this.
+        assert state_group is not None
+
+        # We also will want to generate notifs for other people in the room so
+        # their unread countss are correct in the event stream, but to avoid
+        # generating them for bot / AS users etc, we only do so for people who've
+        # sent a read receipt into the room.
+        local_users_in_room = set(
+            e.state_key for e in current_state.values()
+            if e.type == EventTypes.Member and e.membership == Membership.JOIN
+            and self.hs.is_mine_id(e.state_key)
+        )
+
+        # users in the room who have pushers need to get push rules run because
+        # that's how their pushers work
+        if_users_with_pushers = yield self.get_if_users_have_pushers(
+            local_users_in_room, on_invalidate=cache_context.invalidate,
+        )
+        user_ids = set(
+            uid for uid, have_pusher in if_users_with_pushers.items() if have_pusher
+        )
+
+        users_with_receipts = yield self.get_users_with_read_receipts_in_room(
+            room_id, on_invalidate=cache_context.invalidate,
+        )
+
+        # any users with pushers must be ours: they have pushers
+        for uid in users_with_receipts:
+            if uid in local_users_in_room:
+                user_ids.add(uid)
+
+        rules_by_user = yield self.bulk_get_push_rules(
+            user_ids, on_invalidate=cache_context.invalidate,
+        )
+
+        rules_by_user = {k: v for k, v in rules_by_user.items() if v is not None}
+
+        defer.returnValue(rules_by_user)
+
     @cachedList(cached_method_name="get_push_rules_enabled_for_user",
                 list_name="user_ids", num_args=1, inlineCallbacks=True)
     def bulk_get_push_rules_enabled(self, user_ids):
diff --git a/synapse/storage/pusher.py b/synapse/storage/pusher.py
index a7d7c54d7e..8f5f8f24a9 100644
--- a/synapse/storage/pusher.py
+++ b/synapse/storage/pusher.py
@@ -135,7 +135,7 @@ class PusherStore(SQLBaseStore):
             "get_all_updated_pushers", get_all_updated_pushers_txn
         )
 
-    @cachedInlineCallbacks(lru=True, num_args=1, max_entries=15000)
+    @cachedInlineCallbacks(num_args=1, max_entries=15000)
     def get_if_user_has_pusher(self, user_id):
         result = yield self._simple_select_many_batch(
             table='pushers',
diff --git a/synapse/storage/receipts.py b/synapse/storage/receipts.py
index 8c26f39fbb..3ad916103f 100644
--- a/synapse/storage/receipts.py
+++ b/synapse/storage/receipts.py
@@ -120,7 +120,7 @@ class ReceiptsStore(SQLBaseStore):
 
         defer.returnValue([ev for res in results.values() for ev in res])
 
-    @cachedInlineCallbacks(num_args=3, max_entries=5000, lru=True, tree=True)
+    @cachedInlineCallbacks(num_args=3, max_entries=5000, tree=True)
     def get_linearized_receipts_for_room(self, room_id, to_key, from_key=None):
         """Get receipts for a single room for sending to clients.
 
diff --git a/synapse/storage/signatures.py b/synapse/storage/signatures.py
index ea6823f18d..e1dca927d7 100644
--- a/synapse/storage/signatures.py
+++ b/synapse/storage/signatures.py
@@ -25,7 +25,7 @@ from synapse.util.caches.descriptors import cached, cachedList
 class SignatureStore(SQLBaseStore):
     """Persistence for event signatures and hashes"""
 
-    @cached(lru=True)
+    @cached()
     def get_event_reference_hash(self, event_id):
         return self._get_event_reference_hashes_txn(event_id)
 
diff --git a/synapse/storage/state.py b/synapse/storage/state.py
index 5b743db67a..0e8fa93e1f 100644
--- a/synapse/storage/state.py
+++ b/synapse/storage/state.py
@@ -174,7 +174,7 @@ class StateStore(SQLBaseStore):
             return [r[0] for r in results]
         return self.runInteraction("get_current_state_for_key", f)
 
-    @cached(num_args=2, lru=True, max_entries=1000)
+    @cached(num_args=2, max_entries=1000)
     def _get_state_group_from_group(self, group, types):
         raise NotImplementedError()
 
@@ -272,7 +272,7 @@ class StateStore(SQLBaseStore):
         state_map = yield self.get_state_for_events([event_id], types)
         defer.returnValue(state_map[event_id])
 
-    @cached(num_args=2, lru=True, max_entries=10000)
+    @cached(num_args=2, max_entries=10000)
     def _get_state_group_for_event(self, room_id, event_id):
         return self._simple_select_one_onecol(
             table="event_to_state_groups",