Implement event format v2

4 files changed, 108 insertions, 19 deletions

diff --git a/synapse/api/constants.py b/synapse/api/constants.py
index 51ee078bc3..b248e193fa 100644
--- a/synapse/api/constants.py
+++ b/synapse/api/constants.py
@@ -126,10 +126,12 @@ class EventFormatVersions(object):
     independently from the room version.
     """
     V1 = 1
+    V2 = 2
 
 
 KNOWN_EVENT_FORMAT_VERSIONS = {
     EventFormatVersions.V1,
+    EventFormatVersions.V2,
 }
 
 
diff --git a/synapse/events/__init__.py b/synapse/events/__init__.py
index 3fe52aaa45..627c55c404 100644
--- a/synapse/events/__init__.py
+++ b/synapse/events/__init__.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 # Copyright 2014-2016 OpenMarket Ltd
+# Copyright 2019 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.
@@ -18,11 +19,9 @@ from distutils.util import strtobool
 
 import six
 
-from synapse.api.constants import (
-    KNOWN_EVENT_FORMAT_VERSIONS,
-    KNOWN_ROOM_VERSIONS,
-    EventFormatVersions,
-)
+from unpaddedbase64 import encode_base64
+
+from synapse.api.constants import KNOWN_ROOM_VERSIONS, EventFormatVersions, RoomVersions
 from synapse.util.caches import intern_dict
 from synapse.util.frozenutils import freeze
 
@@ -225,22 +224,91 @@ class FrozenEvent(EventBase):
             rejected_reason=rejected_reason,
         )
 
-    @staticmethod
-    def from_event(event):
-        e = FrozenEvent(
-            event.get_pdu_json()
+    def __str__(self):
+        return self.__repr__()
+
+    def __repr__(self):
+        return "<FrozenEvent event_id='%s', type='%s', state_key='%s'>" % (
+            self.get("event_id", None),
+            self.get("type", None),
+            self.get("state_key", None),
         )
 
-        e.internal_metadata = event.internal_metadata
 
-        return e
+class FrozenEventV2(EventBase):
+    format_version = EventFormatVersions.V2  # All events of this type are V2
+
+    def __init__(self, event_dict, internal_metadata_dict={}, rejected_reason=None):
+        event_dict = dict(event_dict)
+
+        # Signatures is a dict of dicts, and this is faster than doing a
+        # copy.deepcopy
+        signatures = {
+            name: {sig_id: sig for sig_id, sig in sigs.items()}
+            for name, sigs in event_dict.pop("signatures", {}).items()
+        }
+
+        assert "event_id" not in event_dict
+
+        unsigned = dict(event_dict.pop("unsigned", {}))
+
+        # We intern these strings because they turn up a lot (especially when
+        # caching).
+        event_dict = intern_dict(event_dict)
+
+        if USE_FROZEN_DICTS:
+            frozen_dict = freeze(event_dict)
+        else:
+            frozen_dict = event_dict
+
+        self._event_id = None
+        self.type = event_dict["type"]
+        if "state_key" in event_dict:
+            self.state_key = event_dict["state_key"]
+
+        super(FrozenEventV2, self).__init__(
+            frozen_dict,
+            signatures=signatures,
+            unsigned=unsigned,
+            internal_metadata_dict=internal_metadata_dict,
+            rejected_reason=rejected_reason,
+        )
+
+    @property
+    def event_id(self):
+        # We have to import this here as otherwise we get an import loop which
+        # is hard to break.
+        from synapse.crypto.event_signing import compute_event_reference_hash
+
+        if self._event_id:
+            return self._event_id
+        self._event_id = "$" + encode_base64(compute_event_reference_hash(self)[1])
+        return self._event_id
+
+    def prev_event_ids(self):
+        """Returns the list of prev event IDs. The order matches the order
+        specified in the event, though there is no meaning to it.
+
+        Returns:
+            list[str]: The list of event IDs of this event's prev_events
+        """
+        return self.prev_events
+
+    def auth_event_ids(self):
+        """Returns the list of auth event IDs. The order matches the order
+        specified in the event, though there is no meaning to it.
+
+        Returns:
+            list[str]: The list of event IDs of this event's auth_events
+        """
+        return self.auth_events
 
     def __str__(self):
         return self.__repr__()
 
     def __repr__(self):
-        return "<FrozenEvent event_id='%s', type='%s', state_key='%s'>" % (
-            self.get("event_id", None),
+        return "<FrozenEventV2 event_id='%s', type='%s', state_key='%s'>" % (
+            self.event_id,
             self.get("type", None),
             self.get("state_key", None),
         )
@@ -259,7 +327,13 @@ def room_version_to_event_format(room_version):
         # We should have already checked version, so this should not happen
         raise RuntimeError("Unrecognized room version %s" % (room_version,))
 
-    return EventFormatVersions.V1
+    if room_version in (
+        RoomVersions.V1, RoomVersions.V2, RoomVersions.VDH_TEST,
+        RoomVersions.STATE_V2_TEST,
+    ):
+        return EventFormatVersions.V1
+    else:
+        raise RuntimeError("Unrecognized room version %s" % (room_version,))
 
 
 def event_type_from_format_version(format_version):
@@ -273,8 +347,12 @@ def event_type_from_format_version(format_version):
         type: A type that can be initialized as per the initializer of
         `FrozenEvent`
     """
-    if format_version not in KNOWN_EVENT_FORMAT_VERSIONS:
+
+    if format_version == EventFormatVersions.V1:
+        return FrozenEvent
+    elif format_version == EventFormatVersions.V2:
+        return FrozenEventV2
+    else:
         raise Exception(
             "No event format %r" % (format_version,)
         )
-    return FrozenEvent
diff --git a/synapse/events/builder.py b/synapse/events/builder.py
index fb0683cea8..06e01be918 100644
--- a/synapse/events/builder.py
+++ b/synapse/events/builder.py
@@ -21,6 +21,7 @@ from synapse.api.constants import (
     KNOWN_EVENT_FORMAT_VERSIONS,
     KNOWN_ROOM_VERSIONS,
     MAX_DEPTH,
+    EventFormatVersions,
 )
 from synapse.crypto.event_signing import add_hashes_and_signatures
 from synapse.types import EventID
@@ -109,8 +110,12 @@ class EventBuilder(object):
             self, state_ids,
         )
 
-        auth_events = yield self._store.add_event_hashes(auth_ids)
-        prev_events = yield self._store.add_event_hashes(prev_event_ids)
+        if self.format_version == EventFormatVersions.V1:
+            auth_events = yield self._store.add_event_hashes(auth_ids)
+            prev_events = yield self._store.add_event_hashes(prev_event_ids)
+        else:
+            auth_events = auth_ids
+            prev_events = prev_event_ids
 
         old_depth = yield self._store.get_max_depth_of(
             prev_event_ids,
@@ -228,7 +233,8 @@ def create_local_event_from_event_dict(clock, hostname, signing_key,
 
     time_now = int(clock.time_msec())
 
-    event_dict["event_id"] = _create_event_id(clock, hostname)
+    if format_version == EventFormatVersions.V1:
+        event_dict["event_id"] = _create_event_id(clock, hostname)
 
     event_dict["origin"] = hostname
     event_dict["origin_server_ts"] = time_now
diff --git a/synapse/events/utils.py b/synapse/events/utils.py
index 63f693f259..07fccdd8f9 100644
--- a/synapse/events/utils.py
+++ b/synapse/events/utils.py
@@ -267,6 +267,7 @@ def serialize_event(e, time_now_ms, as_client_event=True,
     Returns:
         dict
     """
+
     # FIXME(erikj): To handle the case of presence events and the like
     if not isinstance(e, EventBase):
         return e
@@ -276,6 +277,8 @@ def serialize_event(e, time_now_ms, as_client_event=True,
     # Should this strip out None's?
     d = {k: v for k, v in e.get_dict().items()}
 
+    d["event_id"] = e.event_id
+
     if "age_ts" in d["unsigned"]:
         d["unsigned"]["age"] = time_now_ms - d["unsigned"]["age_ts"]
         del d["unsigned"]["age_ts"]