42 lines
1.5 KiB
Python
42 lines
1.5 KiB
Python
# -*- coding: utf-8 -*-
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import logging
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from .poppler_backend import PopplerBackend
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from .ghostscript_backend import GhostscriptBackend
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logger = logging.getLogger("camelot")
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backends = {"poppler": PopplerBackend, "ghostscript": GhostscriptBackend}
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class ImageConversionBackend(object):
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def __init__(self, backend="poppler", use_fallback=True):
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if backend not in backends.keys():
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raise ValueError(f"Image conversion backend '{backend}' not supported")
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self.backend = backend
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self.use_fallback = use_fallback
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self.fallbacks = list(filter(lambda x: x != backend, backends.keys()))
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def convert(self, pdf_path, png_path):
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try:
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converter = backends[self.backend]()
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converter.convert(pdf_path, png_path)
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except Exception as e:
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logger.info(f"Image conversion backend '{self.backend}' failed with {str(e)}")
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if self.use_fallback:
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for fallback in self.fallbacks:
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logger.info(f"Falling back on '{fallback}'")
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try:
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converter = backends[self.backend]()
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converter.convert(pdf_path, png_path)
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except Exception as e:
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logger.info(f"Image conversion backend '{fallback}' failed with {str(e)}")
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continue
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else:
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logger.info(f"Image conversion backend '{fallback}' succeeded")
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break
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