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Fix logcontext handling in verify_json_objects_for_server

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preserve_context_over_fn is essentially broken, because (a) it pointlessly
drops the current logcontext before calling its wrapped function, which means
we don't get any useful logcontexts for _handle_key_deferred; (b) it wraps the
resulting deferred in a _PreservingContextDeferred, which is very dangerous
because you then can't yield on it without leaking context back into the
reactor.

Instead, let's specify that the resultant deferreds call their callbacks with
no logcontext.
This commit is contained in:
Richard van der Hoff 2017-09-20 01:32:42 +01:00
parent c5b0e9f485
commit c5c24c239b
1 changed files with 12 additions and 8 deletions
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16
synapse/crypto/keyring.py
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@ -18,7 +18,7 @@ from synapse.crypto.keyclient import fetch_server_key
from synapse.api.errors import SynapseError, Codes
from synapse.util import unwrapFirstError, logcontext
from synapse.util.logcontext import (
preserve_context_over_fn, PreserveLoggingContext,
PreserveLoggingContext,
preserve_fn
)
from synapse.util.metrics import Measure
@ -83,9 +83,11 @@ class Keyring(object):
self.key_downloads = {}
def verify_json_for_server(self, server_name, json_object):
return self.verify_json_objects_for_server(
return logcontext.make_deferred_yieldable(
self.verify_json_objects_for_server(
[(server_name, json_object)]
)[0]
)
def verify_json_objects_for_server(self, server_and_json):
"""Bulk verifies signatures of json objects, bulk fetching keys as
@ -95,8 +97,10 @@ class Keyring(object):
server_and_json (list): List of pairs of (server_name, json_object)
Returns:
list of deferreds indicating success or failure to verify each
json object's signature for the given server_name.
List<Deferred>: for each input pair, a deferred indicating success
or failure to verify each json object's signature for the given
server_name. The deferreds run their callbacks in the sentinel
logcontext.
"""
verify_requests = []
@ -127,9 +131,9 @@ class Keyring(object):
# Pass those keys to handle_key_deferred so that the json object
# signatures can be verified
handle = preserve_fn(_handle_key_deferred)
return [
preserve_context_over_fn(_handle_key_deferred, rq)
for rq in verify_requests
handle(rq) for rq in verify_requests
]
@defer.inlineCallbacks