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Include event when resolving state for missing prevs
If we have a forward extremity for a room as `E`, and you receive `A`, `B`, s.t. `A -> B -> E`, and `B` also points to an unknown event `X`, then we need to do state res between `X` and `E`. When that happens, we need to make sure we include `X` in the state that goes into the state res alg. Fixes #3934.
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@ -323,8 +323,8 @@ class FederationHandler(BaseHandler):
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affected=pdu.event_id,
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)
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# Calculate the state of the previous events, and
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# de-conflict them to find the current state.
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# Calculate the state after each of the previous events, and
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# resolve them to find the correct state at the current event.
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auth_chains = set()
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event_map = {
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event_id: pdu,
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@ -358,6 +358,20 @@ class FederationHandler(BaseHandler):
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)
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)
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# we want the state *after* p; get_state_for_room returns the
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# state *before* p.
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remote_event = yield self.federation_client.get_pdu(
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[origin], p, outlier=True,
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)
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if remote_event is None:
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raise Exception(
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"Unable to get missing prev_event %s" % (p, )
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)
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if remote_event.is_state():
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remote_state.append(remote_event)
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# XXX hrm I'm not convinced that duplicate events will compare
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# for equality, so I'm not sure this does what the author
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# hoped.
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