Don't fail seeing a backup refering to non-existent disk #67
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benjamreis
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Signed-off-by: Yann Dirson <[email protected]>
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- it is bad practice to "catch any" - not logging anything just hides information, which can be especially important here as the reason for a try/catch is not obvious (exceptions thrown by XenServerBackup.__init__?) Signed-off-by: Yann Dirson <[email protected]>
Previous code structure was that of 2 nested if's, with nominal code path being in the positive branch of each if. Adding another condition will bring a need for logging the reason to ignore a backup, but doing that by converting inner `if` to an `elif` chain (arguably the simplest modification) would bring the nominal code path to switch to the negative/last branch of the inner `elif` chain. At the same time, the outer `if` would not seem special enough to deserve it special place (and the cyclomatic complexity). This commit leverages the existing `try:except:` block to switch to an "error out the loop" pattern, where the nominal code path is just linear. Using `StopIteration` may feel like an abuse, but: - it is the only standard `Exception` that is not a `StandardError` or a `Warning`, and defining a new one could seem overkill - the closest alternative would be a `while True` loop and breaking out in both exceptional code paths and at the end of nominal path, where the `break` statements would "stop the iteration" as well Signed-off-by: Yann Dirson <[email protected]>
…rver#66) Signed-off-by: Yann Dirson <[email protected]>
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This fixes the various problems seen as part of #66, and then some.