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"""
A spider that generate light requests to meassure QPS troughput
usage:
scrapy runspider qpsclient.py --loglevel=INFO --set RANDOMIZE_DOWNLOAD_DELAY=0 --set CONCURRENT_REQUESTS=50 -a qps=10 -a latency=0.3
"""
from scrapy.spiders import Spider
from scrapy.http import Request
class QPSSpider(Spider):
name = 'qps'
benchurl = 'http://localhost:8880/'
# Max concurrency is limited by global CONCURRENT_REQUESTS setting
max_concurrent_requests = 8
# Requests per second goal
qps = None # same as: 1 / download_delay
download_delay = None
# time in seconds to delay server responses
latency = None
# number of slots to create
slots = 1
def __init__(self, *a, **kw):
super(QPSSpider, self).__init__(*a, **kw)
if self.qps is not None:
self.qps = float(self.qps)
self.download_delay = 1 / self.qps
elif self.download_delay is not None:
self.download_delay = float(self.download_delay)
def start_requests(self):
url = self.benchurl
if self.latency is not None:
url += '?latency={0}'.format(self.latency)
slots = int(self.slots)
if slots > 1:
urls = [url.replace('localhost', '127.0.0.%d' % (x + 1)) for x in range(slots)]
else:
urls = [url]
idx = 0
while True:
url = urls[idx % len(urls)]
yield Request(url, dont_filter=True)
idx += 1
def parse(self, response):
pass
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