44 lines
1.6 KiB
Python
44 lines
1.6 KiB
Python
# Define your item pipelines here
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#
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# Don't forget to add your pipeline to the ITEM_PIPELINES setting
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# See: http://doc.scrapy.org/en/latest/topics/item-pipeline.html
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import re
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from scrapy.exceptions import DropItem
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class DuplicatePipeline(object):
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def __init__(self):
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self.known_values = set()
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def process_item(self, item, spider):
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"""
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Processing the items so exact doubles are dropped
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:param item: The incoming item
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:param spider: The spider which scraped the spider
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:return: :raise DropItem: Returns the item if unique or drops them if it's already known
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"""
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value = (item['attribute'], item['value'], item['conditions'])
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if value in self.known_values:
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raise DropItem("Duplicate item found: %s" % item) # #[todo] append sources of first item.
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else:
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self.known_values.add(value)
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return item
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class AttributeSelectionPipeline(object):
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def __init__(self):
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pass;
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def process_item(self, item, spider):
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"""
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The items are processed using the selected attribute list available in the spider,
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items that don't match the selected items are dropped.
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:param item: The incoming item
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:param spider: The spider which scraped the item. Should have an attribute "selected_attributes".
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:return: :raise DropItem: Returns item if it matches an selected attribute, else it is dropped.
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"""
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if [x for x in spider.selected_attributes if re.match(x, item["attribute"])]:
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return item
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else:
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raise DropItem("Attribute not selected by used: %s" % item) |