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cache DNS results in UDPRelay

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This commit is contained in:
clowwindy 2015-07-10 17:39:24 +08:00
parent 99b4121fd9
commit 13a6bb007c
1 changed files with 10 additions and 5 deletions
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15
shadowsocks/udprelay.py
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@ -103,6 +103,7 @@ class UDPRelay(object):
close_callback=self._close_client)
self._client_fd_to_server_addr = \
lru_cache.LRUCache(timeout=config['timeout'])
self._dns_cache = lru_cache.LRUCache(timeout=300)
self._eventloop = None
self._closed = False
self._last_time = time.time()
@ -170,11 +171,15 @@ class UDPRelay(object):
else:
server_addr, server_port = dest_addr, dest_port
addrs = socket.getaddrinfo(server_addr, server_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if not addrs:
# drop
return
addrs = self._dns_cache.get(server_addr, None)
if addrs is None:
addrs = socket.getaddrinfo(server_addr, server_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if not addrs:
# drop
return
else:
self._dns_cache[server_addr] = addrs
af, socktype, proto, canonname, sa = addrs[0]
key = client_key(r_addr, af)