Merge pull request #132 from matrix-org/observer_and_locks

Observer and locks
This commit is contained in:
Erik Johnston 2015-04-27 14:41:14 +01:00
commit 1c1d67dfef
3 changed files with 42 additions and 1 deletions

View File

@ -24,6 +24,8 @@ from synapse.api.errors import SynapseError, Codes
from synapse.util.retryutils import get_retry_limiter
from synapse.util.async import create_observer
from OpenSSL import crypto
import logging
@ -38,6 +40,8 @@ class Keyring(object):
self.clock = hs.get_clock()
self.hs = hs
self.key_downloads = {}
@defer.inlineCallbacks
def verify_json_for_server(self, server_name, json_object):
logger.debug("Verifying for %s", server_name)
@ -97,6 +101,22 @@ class Keyring(object):
defer.returnValue(cached[0])
return
download = self.key_downloads.get(server_name)
if download is None:
download = self._get_server_verify_key_impl(server_name, key_ids)
self.key_downloads[server_name] = download
@download.addBoth
def callback(ret):
del self.key_downloads[server_name]
return ret
r = yield create_observer(download)
defer.returnValue(r)
@defer.inlineCallbacks
def _get_server_verify_key_impl(self, server_name, key_ids):
# Try to fetch the key from the remote server.
limiter = yield get_retry_limiter(

View File

@ -25,6 +25,8 @@ from twisted.internet import defer
from twisted.web.resource import Resource
from twisted.protocols.basic import FileSender
from synapse.util.async import create_observer
import os
import logging
@ -87,7 +89,7 @@ class BaseMediaResource(Resource):
def callback(media_info):
del self.downloads[key]
return media_info
return download
return create_observer(download)
@defer.inlineCallbacks
def _get_remote_media_impl(self, server_name, media_id):

View File

@ -32,3 +32,22 @@ def run_on_reactor():
iteration of the main loop
"""
return sleep(0)
def create_observer(deferred):
"""Creates a deferred that observes the result or failure of the given
deferred *without* affecting the given deferred.
"""
d = defer.Deferred()
def callback(r):
d.callback(r)
return r
def errback(f):
d.errback(f)
return f
deferred.addCallbacks(callback, errback)
return d