Scrapy decorator for inline requests
Project description
This module provides a decorator that allows to write coroutine-like spider callbacks.
The code is experimental, might not work in all cases and even might be hard to debug.
Example:
from inline_requests import inline_requests
class MySpider(CrawlSpider):
...
@inline_requests
def parse_item(self, response):
item = self.build_item(response)
# scrape more information
response = yield Request(response.url + '?info')
item['info'] = self.extract_info(response)
# scrape pictures
response = yield Request(response.url + '?pictures')
item['pictures'] = self.extract_pictures(response)
# a request that might fail (dns error, network timeout, error 404/500, etc)
try:
response = yield Request(response.url + '?protected')
except Exception as e:
log.err(e, spider=self)
else:
item['protected'] = self.extract_protected_info(response)
# finally yield the item
yield item
Example Project
The example directory includes a example spider for StackOverflow.com:
cd example scrapy crawl stackoverflow
Requirements
Python 2.7+, 3.4+
Scrapy 1.0+
Known Issues
Middlewares can drop or ignore non-200 status responses causing the callback to not continue its execution. This can be overcome by using the flag handle_httpstatus_all. See the httperror middleware documentation.
High concurrency and large responses can cause higher memory usage.
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