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bpo-29757: don't swallows errors in the socket.create_connection() utility loop #562

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bpo-29757: don't swallows errors in the socket.create_connection() utility loop #562

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6c70549
feat(socket): don't swallows errors in `socket.create_connection()` loop
ankostis Mar 8, 2017
b39d4b1
refact(socket): corrections according to #562
ankostis Mar 17, 2017
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14 changes: 8 additions & 6 deletions Lib/socket.py
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Original file line number Diff line number Diff line change
Expand Up @@ -700,7 +700,7 @@ def create_connection(address, timeout=_GLOBAL_DEFAULT_TIMEOUT,
"""

host, port = address
err = None
errors = []
for res in getaddrinfo(host, port, 0, SOCK_STREAM):
af, socktype, proto, canonname, sa = res
sock = None
Expand All @@ -713,13 +713,15 @@ def create_connection(address, timeout=_GLOBAL_DEFAULT_TIMEOUT,
sock.connect(sa)
return sock

except error as _:
err = _
except error as ex:
errors.append(ex)
if sock is not None:
sock.close()

if err is not None:
raise err
nerr = len(errors)
if nerr == 1:
raise errors[0]
elif nerr > 1:
raise error("no connection possible due to %d errors" % nerr, errors)
else:
raise error("getaddrinfo returns an empty list")

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