How Do I? Fail silently when no articles to DL

tBunnyMan · 05-09-2012, 02:59 PM

Is there any hack or other way to cleanly fail if there is no articles to download?

I understand that a completely silent failure is bad since the user can't tell why they didn't get their book but it's troublesome to have to check all the exceptions when no book generated is expected from time to time.
False Negatives desensitize the user.

Ex.
The Pocket plugin: The articles can be depleted by the user and if they don't refill it before the next scheduled download they get thrown exceptions, not clean errors. Currently I raise the exception but logging the problem and returning an empty list makes Calibre error out just as hard.

kovidgoyal · 05-10-2012, 12:23 AM

There's no way to fail silently. I can't think of any case where that is a good idea. Say you download from Pocket and nothing happens, how is that better than an error message telling you that download failed?

kovidgoyal · 05-12-2012, 01:08 PM

I have added a method to fail and display a simple message to the user instead of an error dialog. http://bazaar.launchpad.net/~kovid/c...revision/12162

If you want to use it in your recipe and have your recipe remain compatible with older calibre versions, do this

Code:

if hasattr(self, 'abort_recipe_processing'):
   self.abort_recipe_processing('Pocket download aborted as no new articles found')

tBunnyMan · 05-14-2012, 11:11 PM

Thank you so very much for this feature!

I will get the plugin updated soon!

05-09-2012, 02:59 PM	#1
tBunnyMan Enthusiast Posts: 39 Karma: 10 Join Date: Feb 2012 Location: Las Vegas, NV Device: nook Simple GlowLight	How Do I? Fail silently when no articles to DL Is there any hack or other way to cleanly fail if there is no articles to download? I understand that a completely silent failure is bad since the user can't tell why they didn't get their book but it's troublesome to have to check all the exceptions when no book generated is expected from time to time. False Negatives desensitize the user. Ex. The Pocket plugin: The articles can be depleted by the user and if they don't refill it before the next scheduled download they get thrown exceptions, not clean errors. Currently I raise the exception but logging the problem and returning an empty list makes Calibre error out just as hard.

05-12-2012, 01:08 PM	#3
kovidgoyal creator of calibre Posts: 43,843 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	I have added a method to fail and display a simple message to the user instead of an error dialog. http://bazaar.launchpad.net/~kovid/c...revision/12162 If you want to use it in your recipe and have your recipe remain compatible with older calibre versions, do this Code: if hasattr(self, 'abort_recipe_processing'): self.abort_recipe_processing('Pocket download aborted as no new articles found')

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05-10-2012, 12:23 AM	#2
kovidgoyal creator of calibre Posts: 43,843 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	There's no way to fail silently. I can't think of any case where that is a good idea. Say you download from Pocket and nothing happens, how is that better than an error message telling you that download failed?

05-14-2012, 11:11 PM	#4
tBunnyMan Enthusiast Posts: 39 Karma: 10 Join Date: Feb 2012 Location: Las Vegas, NV Device: nook Simple GlowLight	Thank you so very much for this feature! I will get the plugin updated soon!

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