1 files changed, 24 insertions, 0 deletions
diff --git a/synapse/replication/tcp/streams/_base.py b/synapse/replication/tcp/streams/_base.py
index 520c45f151..9d75a89f1c 100644
--- a/synapse/replication/tcp/streams/_base.py
+++ b/synapse/replication/tcp/streams/_base.py
@@ -290,6 +290,30 @@ class PresenceStream(Stream):
         )
 
 
+class PresenceFederationStream(Stream):
+    """A stream used to send ad hoc presence updates over federation.
+
+    Streams the remote destination and the user ID of the presence state to
+    send.
+    """
+
+    @attr.s(slots=True, auto_attribs=True)
+    class PresenceFederationStreamRow:
+        destination: str
+        user_id: str
+
+    NAME = "presence_federation"
+    ROW_TYPE = PresenceFederationStreamRow
+
+    def __init__(self, hs: "HomeServer"):
+        federation_queue = hs.get_presence_handler().get_federation_queue()
+        super().__init__(
+            hs.get_instance_name(),
+            federation_queue.get_current_token,
+            federation_queue.get_replication_rows,
+        )
+
+
 class TypingStream(Stream):
     TypingStreamRow = namedtuple(
         "TypingStreamRow", ("room_id", "user_ids")  # str  # list(str)