Dealing with non-Python Dependencies

Mikowmer · 08-24-2022, 08:05 AM

Hello!

I'm currently attempting to troubleshoot someone else's plugin for Calibre. The plugin in question is here: https://github.com/naclander/Calibre...-Driver-Plugin

At the moment, it looks like certain Rust binaries in the Cryptography module aren't importing correctly due to an 'unknown location'.

Code:

ImportError: cannot import name 'asn1' from 'cryptography.hazmat.bindings._rust' (unknown location)

The abi3.so binary files for those specific submodules are present. However, when the plugin is being loaded, those binaries are ignored.

Would it be possible to get some help on including non-Python dependencies in a Calibre plugin?

kovidgoyal · 08-24-2022, 08:16 AM

The appropriate folders need to be on sys.path before attempting the import.

Mikowmer · 08-24-2022, 08:33 AM

Quote:

Originally Posted by kovidgoyal

The appropriate folders need to be on sys.path before attempting the import.

... Meaning?

Is that the appropriate folders for the module, or the non-Python code?

kovidgoyal · 08-24-2022, 09:28 AM

The folder that contains the python package you are importing has to be on sys.path if it is and the abi version of the compiled module is a match it will import.

Kenivia · 08-31-2022, 12:22 AM

I've posted a workaround on GitHub here. You were right, the path added to sys.path was the path to the zip file.

Having the library somewhere else is not the most elegant solution, is there a better way to do this? Maybe the plugin could decompress the zip file temporarily?

kovidgoyal · 08-31-2022, 02:12 AM

Code:

with self:
   import whatever

see the __enter__ method of the Plugin base class

08-24-2022, 08:05 AM	#1
Mikowmer Member Posts: 18 Karma: 10 Join Date: Aug 2022 Location: Australia Device: reMarkable 2	Dealing with non-Python Dependencies Hello! I'm currently attempting to troubleshoot someone else's plugin for Calibre. The plugin in question is here: https://github.com/naclander/Calibre...-Driver-Plugin At the moment, it looks like certain Rust binaries in the Cryptography module aren't importing correctly due to an 'unknown location'. Code: ImportError: cannot import name 'asn1' from 'cryptography.hazmat.bindings._rust' (unknown location) The abi3.so binary files for those specific submodules are present. However, when the plugin is being loaded, those binaries are ignored. Would it be possible to get some help on including non-Python dependencies in a Calibre plugin?

08-31-2022, 12:22 AM	#5
Kenivia Junior Member Posts: 1 Karma: 10 Join Date: Aug 2022 Device: Remarkable2	I've posted a workaround on GitHub here. You were right, the path added to sys.path was the path to the zip file. Having the library somewhere else is not the most elegant solution, is there a better way to do this? Maybe the plugin could decompress the zip file temporarily? Last edited by Kenivia; 08-31-2022 at 12:26 AM.

08-31-2022, 02:12 AM	#6
kovidgoyal creator of calibre Posts: 43,977 Karma: 22669822 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Code: with self: import whatever see the __enter__ method of the Plugin base class

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08-24-2022, 08:16 AM	#2
kovidgoyal creator of calibre Posts: 43,977 Karma: 22669822 Join Date: Oct 2006 Location: Mumbai, India Device: Various	The appropriate folders need to be on sys.path before attempting the import.

08-24-2022, 09:28 AM	#4
kovidgoyal creator of calibre Posts: 43,977 Karma: 22669822 Join Date: Oct 2006 Location: Mumbai, India Device: Various	The folder that contains the python package you are importing has to be on sys.path if it is and the abi version of the compiled module is a match it will import.

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