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-rw-r--r--synapse/__init__.py2
-rw-r--r--synapse/push/presentable_names.py26
-rw-r--r--synapse/python_dependencies.py4
-rw-r--r--synapse/util/iterutils.py2
4 files changed, 15 insertions, 19 deletions
diff --git a/synapse/__init__.py b/synapse/__init__.py
index d423856d82..3cd682f9e7 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -48,7 +48,7 @@ try:
 except ImportError:
     pass
 
-__version__ = "1.26.0rc1"
+__version__ = "1.26.0rc2"
 
 if bool(os.environ.get("SYNAPSE_TEST_PATCH_LOG_CONTEXTS", False)):
     # We import here so that we don't have to install a bunch of deps when
diff --git a/synapse/push/presentable_names.py b/synapse/push/presentable_names.py
index 7e50341d74..04c2c1482c 100644
--- a/synapse/push/presentable_names.py
+++ b/synapse/push/presentable_names.py
@@ -17,7 +17,7 @@ import logging
 import re
 from typing import TYPE_CHECKING, Dict, Iterable, Optional
 
-from synapse.api.constants import EventTypes
+from synapse.api.constants import EventTypes, Membership
 from synapse.events import EventBase
 from synapse.types import StateMap
 
@@ -63,7 +63,7 @@ async def calculate_room_name(
         m_room_name = await store.get_event(
             room_state_ids[(EventTypes.Name, "")], allow_none=True
         )
-        if m_room_name and m_room_name.content and m_room_name.content["name"]:
+        if m_room_name and m_room_name.content and m_room_name.content.get("name"):
             return m_room_name.content["name"]
 
     # does it have a canonical alias?
@@ -74,15 +74,11 @@ async def calculate_room_name(
         if (
             canon_alias
             and canon_alias.content
-            and canon_alias.content["alias"]
+            and canon_alias.content.get("alias")
             and _looks_like_an_alias(canon_alias.content["alias"])
         ):
             return canon_alias.content["alias"]
 
-    # at this point we're going to need to search the state by all state keys
-    # for an event type, so rearrange the data structure
-    room_state_bytype_ids = _state_as_two_level_dict(room_state_ids)
-
     if not fallback_to_members:
         return None
 
@@ -94,7 +90,7 @@ async def calculate_room_name(
 
     if (
         my_member_event is not None
-        and my_member_event.content["membership"] == "invite"
+        and my_member_event.content.get("membership") == Membership.INVITE
     ):
         if (EventTypes.Member, my_member_event.sender) in room_state_ids:
             inviter_member_event = await store.get_event(
@@ -111,6 +107,10 @@ async def calculate_room_name(
         else:
             return "Room Invite"
 
+    # at this point we're going to need to search the state by all state keys
+    # for an event type, so rearrange the data structure
+    room_state_bytype_ids = _state_as_two_level_dict(room_state_ids)
+
     # we're going to have to generate a name based on who's in the room,
     # so find out who is in the room that isn't the user.
     if EventTypes.Member in room_state_bytype_ids:
@@ -120,8 +120,8 @@ async def calculate_room_name(
         all_members = [
             ev
             for ev in member_events.values()
-            if ev.content["membership"] == "join"
-            or ev.content["membership"] == "invite"
+            if ev.content.get("membership") == Membership.JOIN
+            or ev.content.get("membership") == Membership.INVITE
         ]
         # Sort the member events oldest-first so the we name people in the
         # order the joined (it should at least be deterministic rather than
@@ -194,11 +194,7 @@ def descriptor_from_member_events(member_events: Iterable[EventBase]) -> str:
 
 
 def name_from_member_event(member_event: EventBase) -> str:
-    if (
-        member_event.content
-        and "displayname" in member_event.content
-        and member_event.content["displayname"]
-    ):
+    if member_event.content and member_event.content.get("displayname"):
         return member_event.content["displayname"]
     return member_event.state_key
 
diff --git a/synapse/python_dependencies.py b/synapse/python_dependencies.py
index c97e0df1f5..bfd46a3730 100644
--- a/synapse/python_dependencies.py
+++ b/synapse/python_dependencies.py
@@ -86,8 +86,8 @@ REQUIREMENTS = [
 
 CONDITIONAL_REQUIREMENTS = {
     "matrix-synapse-ldap3": ["matrix-synapse-ldap3>=0.1"],
-    # we use execute_batch, which arrived in psycopg 2.7.
-    "postgres": ["psycopg2>=2.7"],
+    # we use execute_values with the fetch param, which arrived in psycopg 2.8.
+    "postgres": ["psycopg2>=2.8"],
     # ACME support is required to provision TLS certificates from authorities
     # that use the protocol, such as Let's Encrypt.
     "acme": [
diff --git a/synapse/util/iterutils.py b/synapse/util/iterutils.py
index 6ef2b008a4..8d2411513f 100644
--- a/synapse/util/iterutils.py
+++ b/synapse/util/iterutils.py
@@ -78,7 +78,7 @@ def sorted_topologically(
         if node not in degree_map:
             continue
 
-        for edge in edges:
+        for edge in set(edges):
             if edge in degree_map:
                 degree_map[node] += 1