data_source_plugin: only keep in cache succesfull retrieval of a data source
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@ -83,7 +83,7 @@ class Data(object):
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else:
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logger.debug('getting data source %r from url %r finished',
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self.data_source.id, self.final_url)
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if self.refresh:
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if self.refresh and content is not None:
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cache.set(self.key, (content, self.now+self.refresh), 3600)
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return content
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