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clarify comments

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This commit is contained in:
Erik Johnston 2019-03-05 09:16:35 +00:00
parent 0d2d046709
commit aa06d26ae0
3 changed files with 13 additions and 10 deletions
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19
synapse/handlers/federation.py
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@ -862,9 +862,9 @@ class FederationHandler(BaseHandler):
# as otherwise we'll just spend a lot of resources to get redacted
# events.
#
# We do this by filtering all the extremities and seeing if any remain.
# Given we don't have the extremity events themselves, we need to
# actually check the events that reference them.
# We do this by filtering all the backwards extremities and seeing if
# any remain. Given we don't have the extremity events themselves, we
# need to actually check the events that reference them.
#
# *Note*: the spec wants us to keep backfilling until we reach the start
# of the room in case we are allowed to see some of the history. However
@ -873,13 +873,16 @@ class FederationHandler(BaseHandler):
# there is its often sufficiently long ago that clients would stop
# attempting to paginate before backfill reached the visible history.
#
# TODO: If we do do a backfill the we should filter the extremities to
# only include those that point to visible portions of history.
# TODO: If we do do a backfill then we should filter the backwards
# extremities to only include those that point to visible portions of
# history.
#
# TODO: Correctly handle the case where we are allowed to see the
# forward event but not the extremity, e.g. in the case of initial
# join of the server where we are allowed to see the join event but
# not anything before it.
# forward event but not the backward extremity, e.g. in the case of
# initial join of the server where we are allowed to see the join
# event but not anything before it. This would require looking at the
# state *before* the event, ignoring the special casing certain event
# types have.
forward_events = yield self.store.get_successor_events(
list(extremities),