def setup_crawler(self, supermarket, reactor_control):
"""Set up the Scrapy crawler.
See http://doc.scrapy.org/en/latest/topics/practices.html#run-scrapy-from-a-script.
Keyword arguments:
supermarket -- the supermarket whose crawler should be set up
"""
cachefile = supermarket_filename(supermarket)
if isfile(cachefile):
remove(cachefile)
settings = get_project_settings()
url = supermarket_url(supermarket)
settings.set('FEED_URI', supermarket_filename(supermarket))
spider = MySupermarketSpider(url)
crawler = Crawler(settings)
crawler.signals.connect(reactor_control.remove_crawler,
signal=signals.spider_closed)
crawler.configure()
crawler.crawl(spider)
crawler.start()
reactor_control.add_crawler()
def setup_crawler(self, supermarket, reactor_control):
"""Set up the Scrapy crawler.
See http://doc.scrapy.org/en/latest/topics/practices.html#run-scrapy-from-a-script.
Keyword arguments:
supermarket -- the supermarket whose crawler should be set up
"""
cachefile = supermarket_filename(supermarket)
if isfile(cachefile):
remove(cachefile)
settings = get_project_settings()
url = supermarket_url(supermarket)
settings.set('FEED_URI', supermarket_filename(supermarket))
spider = MySupermarketSpider(url)
crawler = Crawler(settings)
crawler.signals.connect(reactor_control.remove_crawler, signal=signals.spider_closed)
crawler.configure()
crawler.crawl(spider)
crawler.start()
reactor_control.add_crawler()
def cache_exists(self, supermarket):
"""Check whether a JSON file already exists for data scraped from
the given supermarket, and if so, whether it was created today.
Note that 'created today' is not the same as 'age < 24 hours'. Prices
are assumed to change overnight so a cachefile created at 9pm
yesterday is considered out of date at 9am today (but a cachefile
created at 9am is not out of date at 9pm).
Keyword arguments:
supermarket -- the supermarket whose cachefile should be checked
"""
cachefile = supermarket_filename(supermarket)
if not isfile(cachefile):
return False
mtime = datetime.fromtimestamp(getmtime(cachefile))
now = datetime.fromtimestamp(time())
return mtime.day == now.day
def cache_exists(self, supermarket):
"""Check whether a JSON file already exists for data scraped from
the given supermarket, and if so, whether it was created today.
Note that 'created today' is not the same as 'age < 24 hours'. Prices
are assumed to change overnight so a cachefile created at 9pm
yesterday is considered out of date at 9am today (but a cachefile
created at 9am is not out of date at 9pm).
Keyword arguments:
supermarket -- the supermarket whose cachefile should be checked
"""
cachefile = supermarket_filename(supermarket)
if not isfile(cachefile):
return False
mtime = datetime.fromtimestamp(getmtime(cachefile))
now = datetime.fromtimestamp(time())
return mtime.day == now.day
def run():
"""Main method.
Check which supermarkets were requested, create a scraper, then search the
scraped data.
"""
(options, args) = parse_args()
if (options.all):
supermarkets = supermarket_names()
else:
supermarkets = [options.supermarket]
scraper = CachingScraper(supermarkets, options.force_refresh)
log.start()
scraper.get_data()
search_phrases = []
for line in fileinput.input(args):
search_phrases.append(line.split())
for supermarket in supermarkets:
log.msg("*** Savvy buys in %s ***" % supermarket.upper())
search_file(search_phrases, supermarket_filename(supermarket))
