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relay: code cleanup, possibly fix clones for PyLink clients being spawned from rare race conditions

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This commit is contained in:
James Lu 2016-05-01 14:21:14 -07:00
parent ab5624343b
commit 54987fde4e
1 changed files with 16 additions and 5 deletions
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21
plugins/relay.py
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@ -328,30 +328,41 @@ def spawnRelayUser(irc, remoteirc, user):
return u
def getRemoteUser(irc, remoteirc, user, spawnIfMissing=True):
"""Gets the UID of the relay client for the given IRC network/user pair,
"""
Gets the UID of the relay client requested on the target network (remoteirc),
spawning one if it doesn't exist and spawnIfMissing is True."""
# Wait until both the local and remote networks are working before trying to spawn anything.
log.debug('(%s) getRemoteUser: waiting for irc.connected', irc.name)
irc.connected.wait()
log.debug('(%s) getRemoteUser: waiting for %s.connected', irc.name, remoteirc.name)
remoteirc.connected.wait()
# If the user (stored here as {('netname', 'UID'):
# {'network1': 'UID1', 'network2': 'UID2'}}) exists, don't spawn it
# again!
try:
# We're relaying a message from the main PyLink client. These don't have
# relay clones, so relay them through the other network's main client.
if user == irc.pseudoclient.uid:
return remoteirc.pseudoclient.uid
except AttributeError: # Network hasn't been initialized yet?
pass
return
with spawnlocks[irc.name]:
# Be sort-of thread safe: lock the user spawns for the current net first.
u = None
try:
# Look up the existing user, stored here as dict entries in the format:
# {('ournet', 'UID'): {'remotenet1': 'UID1', 'remotenet2': 'UID2'}}
u = relayusers[(irc.name, user)][remoteirc.name]
except KeyError:
# User doesn't exist. Spawn a new one if requested.
if spawnIfMissing:
u = spawnRelayUser(irc, remoteirc, user)
# This is a sanity check to make sure netsplits and other state resets
# don't break the relayer. If it turns out there was a client in our relayusers
# cache for the requested UID, but it doesn't match the request,
# assume it was a leftover from the last split and replace it with a new one.
if u and ((u not in remoteirc.users) or remoteirc.users[u].remote != (irc.name, user)):
spawnRelayUser(irc, remoteirc, user)
return u