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"""
A Stats collector for persisting stats to Amazon SimpleDB.
Requires the boto library: http://code.google.com/p/boto/
"""
from datetime import datetime
from boto import connect_sdb
from twisted.internet import threads
from scrapy.utils.simpledb import to_sdb_value
from scrapy.stats.collector import StatsCollector
from scrapy import log
from scrapy.conf import settings
class SimpledbStatsCollector(StatsCollector):
def __init__(self):
super(SimpledbStatsCollector, self).__init__()
self._sdbdomain = settings['STATS_SDB_DOMAIN']
self._async = settings.getbool('STATS_SDB_ASYNC')
connect_sdb().create_domain(self._sdbdomain)
def _persist_stats(self, stats, spider=None):
if spider is None: # only store spider-specific stats
return
if not self._sdbdomain:
return
if self._async:
dfd = threads.deferToThread(self._persist_to_sdb, spider, stats.copy())
dfd.addErrback(log.err, 'Error uploading stats to SimpleDB', \
spider=spider)
else:
self._persist_to_sdb(spider, stats)
def _persist_to_sdb(self, spider, stats):
ts = self._get_timestamp(spider).isoformat()
sdb_item_id = "%s_%s" % (spider.domain_name, ts)
sdb_item = dict((k, self._to_sdb_value(v, k)) for k, v in stats.iteritems())
sdb_item['domain'] = spider.domain_name
sdb_item['timestamp'] = self._to_sdb_value(ts)
connect_sdb().put_attributes(self._sdbdomain, sdb_item_id, sdb_item)
def _get_timestamp(self, spider):
return datetime.utcnow()
def _to_sdb_value(self, obj, key=None):
try:
return to_sdb_value(obj)
except TypeError:
raise TypeError("%s unsupported type %r used in key %r" % \
(type(self).__name__, type(obj).__name__, key))
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