Barry A. Warsaw <[email protected]> added the comment:
On Dec 6, 2017, at 02:06, Xavier de Gaye <[email protected]> wrote:
>
> Whatever the change made to fix this issue, it is not possible to add a test
> case for this change.
Even with say, exception raising mocks for the getters?
> So following the suggestion made by Barry in PR 4696, we can add (in another
> issue) a new keyword parameter to getnode() named 'methods' whose value may
> be None (the default, meaning try all the known methods) or a tuple
> containing a subset of the following methods ('unix', 'ifconfig', 'ip',
> 'arp', 'lanscan', 'netstat', 'random') that would raise an exception if the
> value cannot be obtained using one of the requested method tried in the
> requested order. This would also improve the documentation on the methods
> getnode() is using. Then if we decide to make the change for 'ip link' in the
> current issue, one can add a test case that would first test for the
> avaibility of the ip command and if the command exists would fail if
> getnode(methods=('ip',)) raises an exception.
I am thinking about this slightly differently.
What if getnode() accepted a `handler` argument and the code was changed to
something like this:
1 file changed, 4 insertions(+), 2 deletions(-)
Lib/uuid.py | 6 ++++--
modified Lib/uuid.py
@@ -656,7 +656,7 @@ def _random_getnode():
_node = None
-def getnode():
+def getnode(handler=None):
"""Get the hardware address as a 48-bit positive integer.
The first time this runs, it may launch a separate program, which could
@@ -677,7 +677,9 @@ def getnode():
for getter in getters + [_random_getnode]:
try:
_node = getter()
- except:
+ except Exception as error:
+ if handler is not None:
+ handler(getter, error)
continue
if _node is not None:
return _node
`handler` could log some diagnostics, reraise the exception, raise
StopIteration, etc. Then we could use that in the test suite too, because we
could mock a getter to raise an exception and then pass in a handler that
verified the exception was raised with the expected getter.
(Maybe we spell `handler` as `error_handler`.)
----------
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Python tracker <[email protected]>
<https://bugs.python.org/issue32199>
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