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Simplification to Keyring.wait_for_previous_lookups. (#5250)

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The list of server names was redundant, since it was equivalent to the keys on
the server_to_deferred map. This reduces the number of large lists being passed
around, and has the benefit of deduplicating the entries in `wait_on`.
This commit is contained in:
Richard van der Hoff 2019-05-24 22:17:18 +01:00 committed by GitHub
parent dd64b9dbdd
commit fa1b293da2
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3 changed files with 7 additions and 9 deletions
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1
changelog.d/5250.misc Normal file
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@ -0,0 +1 @@
Simplification to Keyring.wait_for_previous_lookups.

11
synapse/crypto/keyring.py
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@ -180,9 +180,7 @@ class Keyring(object):
# We want to wait for any previous lookups to complete before
# proceeding.
yield self.wait_for_previous_lookups(
[rq.server_name for rq in verify_requests], server_to_deferred
)
yield self.wait_for_previous_lookups(server_to_deferred)
# Actually start fetching keys.
self._get_server_verify_keys(verify_requests)
@ -215,12 +213,11 @@ class Keyring(object):
logger.exception("Error starting key lookups")
@defer.inlineCallbacks
def wait_for_previous_lookups(self, server_names, server_to_deferred):
def wait_for_previous_lookups(self, server_to_deferred):
"""Waits for any previous key lookups for the given servers to finish.
Args:
server_names (list): list of server_names we want to lookup
server_to_deferred (dict): server_name to deferred which gets
server_to_deferred (dict[str, Deferred]): server_name to deferred which gets
resolved once we've finished looking up keys for that server.
The Deferreds should be regular twisted ones which call their
callbacks with no logcontext.
@ -233,7 +230,7 @@ class Keyring(object):
while True:
wait_on = [
(server_name, self.key_downloads[server_name])
for server_name in server_names
for server_name in server_to_deferred.keys()
if server_name in self.key_downloads
]
if not wait_on:

4
tests/crypto/test_keyring.py
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@ -85,7 +85,7 @@ class KeyringTestCase(unittest.HomeserverTestCase):
# we run the lookup in a logcontext so that the patched inlineCallbacks can check
# it is doing the right thing with logcontexts.
wait_1_deferred = run_in_context(
kr.wait_for_previous_lookups, ["server1"], {"server1": lookup_1_deferred}
kr.wait_for_previous_lookups, {"server1": lookup_1_deferred}
)
# there were no previous lookups, so the deferred should be ready
@ -94,7 +94,7 @@ class KeyringTestCase(unittest.HomeserverTestCase):
# set off another wait. It should block because the first lookup
# hasn't yet completed.
wait_2_deferred = run_in_context(
kr.wait_for_previous_lookups, ["server1"], {"server1": lookup_2_deferred}
kr.wait_for_previous_lookups, {"server1": lookup_2_deferred}
)
self.assertFalse(wait_2_deferred.called)