Feature Requests item #1571878, was opened at 2006-10-06 13:40
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Category: Python Library
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: GaryD (gazzadee)
Assigned to: Nobody/Anonymous (nobody)
Summary: Improvements to socket module exceptions
Initial Comment:
The exceptions thrown by the socket module could be
better thought out.
1/ Inconsistent Parameters For socket error:
The python documentation for socket.error says "The
accompanying value is either a string telling what went
wrong or a pair (errno, string) representing an error
returned by a system call". I assume this is because an
errno is not always available in an error situation.
However, this inconsistency is annoying. If I want to
catch a socket error and (try to) do some
error-number-specific handling, I need to do something
like this:
try:
someNetworkingFunc()
except socket.error, ex:
if len(ex.args) == 2 and type(ex.args[0]) == IntType:
errorNumber = ex.args[0]
errorMsg = ex.args[1]
handleSocketErrorByNumber(errorNumber, errorMsg)
else:
handleUnknownSocketError(ex)
Some different ways to resolve this:
(a) Force socket.error to always have args of (errno,
message). We use a special errno value when none is
actually available.
(b) Subclass socket.error to have one version with
errno and message, and one version with only a message
2/ Better Class Hierarchy:
It would be easier to handle the various socket errors
if we had more of a class hierarchy. eg.
EnvironmentError
-> socket.error
-> socket.timeout
-> socket.AddressError
-> socket.herror
-> socket.gaierror
3/ Use Named Attributes:
It would be easier to access the parameters in
exceptions if we made them named attributes. eg.
class socket.error(EnvironmentError):
def __init__(self, errno, msg):
self.errno = errno
self.msg = msg
# Also pass on the params to the parent class,
# to ensure compatibility with existing code
# that accesses the params via ex.args
EnvironmentError.__init__(self, errno, msg)
try:
someNetworkingFunc()
except socket.error, ex:
print "Error number is %d" % ex.errno
----------------------------------------------------------------------
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