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process_items.py
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process_items.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""A script to process items from a redis queue."""
from __future__ import print_function, unicode_literals
import argparse
import json
import logging
import pprint
import sys
import time
from scrapy_redis import get_redis
logger = logging.getLogger('process_items')
def process_items(r, keys, timeout, limit=0, log_every=1000, wait=.1):
"""Process items from a redis queue.
Parameters
----------
r : Redis
Redis connection instance.
keys : list
List of keys to read the items from.
timeout: int
Read timeout.
"""
limit = limit or float('inf')
processed = 0
while processed < limit:
# Change ``blpop`` to ``brpop`` to process as LIFO.
ret = r.blpop(keys, timeout)
# If data is found before the timeout then we consider we are done.
if ret is None:
time.sleep(wait)
continue
source, data = ret
try:
item = json.loads(data)
except Exception:
logger.exception("Failed to load item:\n%r", pprint.pformat(data))
continue
try:
name = item.get('name') or item.get('title')
url = item.get('url') or item.get('link')
logger.debug("[%s] Processing item: %s <%s>", source, name, url)
except KeyError:
logger.exception("[%s] Failed to process item:\n%r",
source, pprint.pformat(item))
continue
processed += 1
if processed % log_every == 0:
logger.info("Processed %s items", processed)
def main():
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument('key', help="Redis key where items are stored")
parser.add_argument('--host')
parser.add_argument('--port')
parser.add_argument('--timeout', type=int, default=5)
parser.add_argument('--limit', type=int, default=0)
parser.add_argument('--progress-every', type=int, default=100)
parser.add_argument('-v', '--verbose', action='store_true')
args = parser.parse_args()
params = {}
if args.host:
params['host'] = args.host
if args.port:
params['port'] = args.port
logging.basicConfig(level=logging.DEBUG if args.verbose else logging.INFO)
r = get_redis(**params)
host = r.connection_pool.get_connection('info').host
logger.info("Waiting for items in '%s' (server: %s)", args.key, host)
kwargs = {
'keys': [args.key],
'timeout': args.timeout,
'limit': args.limit,
'log_every': args.progress_every,
}
try:
process_items(r, **kwargs)
retcode = 0 # ok
except KeyboardInterrupt:
retcode = 0 # ok
except Exception:
logger.exception("Unhandled exception")
retcode = 2
return retcode
if __name__ == '__main__':
sys.exit(main())