asyncio: Only call _check_resolved_address() in debug mode

* _check_resolved_address() is implemented with getaddrinfo() which is slow
* If available, use socket.inet_pton() instead of socket.getaddrinfo(), because
  it is much faster

Microbenchmark (timeit) on Fedora 21 (Python 3.4, Linux 3.17, glibc 2.20) to
validate the IPV4 address "127.0.0.1" or the IPv6 address "::1":

* getaddrinfo() 10.4 usec per loop
* inet_pton(): 0.285 usec per loop

On glibc older than 2.14, getaddrinfo() always requests the list of all local
IP addresses to the kernel (using a NETLINK socket). getaddrinfo() has other
known issues, it's better to avoid it when it is possible.

1 files changed, 2 insertions, 1 deletions

diff --git a/Lib/asyncio/selector_events.py b/Lib/asyncio/selector_events.py
index 7cbd4fd108d..a38ed1cee3b 100644
--- a/Lib/asyncio/selector_events.py
+++ b/Lib/asyncio/selector_events.py
@@ -397,7 +397,8 @@ class BaseSelectorEventLoop(base_events.BaseEventLoop):
             raise ValueError("the socket must be non-blocking")
         fut = futures.Future(loop=self)
         try:
-            base_events._check_resolved_address(sock, address)
+            if self._debug:
+                base_events._check_resolved_address(sock, address)
         except ValueError as err:
             fut.set_exception(err)
         else: