91 lines
3.1 KiB
Python
91 lines
3.1 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import os
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import lxml
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import scrapy
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from scrapy.contrib import exporter
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class SitemapItemExporter(exporter.XmlItemExporter):
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'''XmlItemExporer with adjusted attributes for the root element.'''
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def start_exporting(self):
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'''Set namespace / schema attributes for the root element.'''
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self.xg.startDocument()
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self.xg.startElement(self.root_element, {
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"xmlns": "http://www.sitemaps.org/schemas/sitemap/0.9",
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"xmlns:xsi": "http://www.w3.org/2001/XMLSchema-instance",
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"xsi:schemaLocation":
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"http://www.sitemaps.org/schemas/sitemap/0.9 "
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"http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd"
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})
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class IgnoreDuplicateUrls(object):
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'''Ignore duplicated URLs.'''
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def __init__(self):
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self.processed = set()
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def process_item(self, item, spider):
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'''Check if a URL was already found.'''
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if item['loc'] in self.processed:
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raise scrapy.exceptions.DropItem("Duplicate URL found: %s."
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% item['loc'])
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else:
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self.processed.add(item['loc'])
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return item
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class ExportSitemap(object):
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'''Write found URLs to a sitemap file.
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Based on http://doc.scrapy.org/en/latest/topics/exporters.html.
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'''
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def __init__(self):
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self.files = {}
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self.exporter = None
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@classmethod
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def from_crawler(cls, crawler):
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pipeline = cls()
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crawler.signals.connect(pipeline.spider_opened,
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scrapy.signals.spider_opened)
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crawler.signals.connect(pipeline.spider_closed,
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scrapy.signals.spider_closed)
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return pipeline
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def spider_opened(self, spider):
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output = open(os.path.join(os.getcwd(), 'sitemap_%s.xml'
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% spider.domain), 'w')
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self.files[spider] = output
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self.exporter = SitemapItemExporter(output, item_element='url',
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root_element='urlset')
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self.exporter.start_exporting()
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def spider_closed(self, spider):
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self.exporter.finish_exporting()
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output = self.files.pop(spider)
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output.close()
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tree = lxml.etree.parse(os.path.join(os.getcwd(), "sitemap_%s.xml"
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% spider.domain))
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with open(os.path.join(os.getcwd(), "sitemap_%s.xml" % spider.domain),
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'w') as pretty:
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pretty.write(lxml.etree.tostring(tree, pretty_print=True))
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def process_item(self, item, spider):
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self.exporter.export_item(item)
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return item
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