diff --git a/synapse/federation/pdu_codec.py b/synapse/federation/pdu_codec.py
deleted file mode 100644
index e8180d94fd..0000000000
--- a/synapse/federation/pdu_codec.py
+++ /dev/null
@@ -1,102 +0,0 @@
-# -*- coding: utf-8 -*-
-# Copyright 2014 OpenMarket 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.
-
-from .units import Pdu
-
-import copy
-
-
-def decode_event_id(event_id, server_name):
- parts = event_id.split("@")
- if len(parts) < 2:
- return (event_id, server_name)
- else:
- return (parts[0], "".join(parts[1:]))
-
-
-def encode_event_id(pdu_id, origin):
- return "%s@%s" % (pdu_id, origin)
-
-
-class PduCodec(object):
-
- def __init__(self, hs):
- self.server_name = hs.hostname
- self.event_factory = hs.get_event_factory()
- self.clock = hs.get_clock()
-
- def event_from_pdu(self, pdu):
- kwargs = {}
-
- kwargs["event_id"] = encode_event_id(pdu.pdu_id, pdu.origin)
- kwargs["room_id"] = pdu.context
- kwargs["etype"] = pdu.pdu_type
- kwargs["prev_events"] = [
- encode_event_id(p[0], p[1]) for p in pdu.prev_pdus
- ]
-
- if hasattr(pdu, "prev_state_id") and hasattr(pdu, "prev_state_origin"):
- kwargs["prev_state"] = encode_event_id(
- pdu.prev_state_id, pdu.prev_state_origin
- )
-
- kwargs.update({
- k: v
- for k, v in pdu.get_full_dict().items()
- if k not in [
- "pdu_id",
- "context",
- "pdu_type",
- "prev_pdus",
- "prev_state_id",
- "prev_state_origin",
- ]
- })
-
- return self.event_factory.create_event(**kwargs)
-
- def pdu_from_event(self, event):
- d = event.get_full_dict()
-
- d["pdu_id"], d["origin"] = decode_event_id(
- event.event_id, self.server_name
- )
- d["context"] = event.room_id
- d["pdu_type"] = event.type
-
- if hasattr(event, "prev_events"):
- d["prev_pdus"] = [
- decode_event_id(e, self.server_name)
- for e in event.prev_events
- ]
-
- if hasattr(event, "prev_state"):
- d["prev_state_id"], d["prev_state_origin"] = (
- decode_event_id(event.prev_state, self.server_name)
- )
-
- if hasattr(event, "state_key"):
- d["is_state"] = True
-
- kwargs = copy.deepcopy(event.unrecognized_keys)
- kwargs.update({
- k: v for k, v in d.items()
- if k not in ["event_id", "room_id", "type", "prev_events"]
- })
-
- if "origin_server_ts" not in kwargs:
- kwargs["origin_server_ts"] = int(self.clock.time_msec())
-
- return Pdu(**kwargs)
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