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# Copyright 2011 Julien Duponchelle <julien@duponchelle.info>.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""MongoDB Pipeline for scrapy"""
import pymongo
from scrapy import log
MONGODB_SAFE = False
MONGODB_ITEM_ID_FIELD = "_id"
class MongoDBPipeline(object):
def __init__(self, mongodb_server, mongodb_port, mongodb_db, mongodb_collection, mongodb_uniq_key,
mongodb_item_id_field, mongodb_safe):
connection = pymongo.Connection(mongodb_server, mongodb_port)
self.mongodb_db = mongodb_db
self.db = connection[mongodb_db]
self.mongodb_collection = mongodb_collection
self.collection = self.db[mongodb_collection]
self.uniq_key = mongodb_uniq_key
self.itemid = mongodb_item_id_field
self.safe = mongodb_safe
if isinstance(self.uniq_key, basestring) and self.uniq_key == "":
self.uniq_key = None
if self.uniq_key:
self.collection.ensure_index(self.uniq_key, unique=True)
@classmethod
def from_crawler(cls, crawler):
settings = crawler.settings
return cls(settings.get('MONGODB_SERVER', 'localhost'), settings.get('MONGODB_PORT', 27017),
settings.get('MONGODB_DB', 'scrapy'), settings.get('MONGODB_COLLECTION', None),
settings.get('MONGODB_UNIQ_KEY', None), settings.get('MONGODB_ITEM_ID_FIELD', MONGODB_ITEM_ID_FIELD),
settings.get('MONGODB_SAFE', MONGODB_SAFE))
def process_item(self, item, spider):
if self.uniq_key is None:
result = self.collection.insert(dict(item), safe=self.safe)
else:
result = self.collection.update({ self.uniq_key: item[self.uniq_key] }, { '$set': dict(item) },
upsert=True, safe=self.safe)
# If item has _id field and is None
if self.itemid in item.fields and not item.get(self.itemid, None):
item[self.itemid] = result
log.msg("Item %s wrote to MongoDB database %s/%s" % (result, self.mongodb_db, self.mongodb_collection),
level=log.DEBUG, spider=spider)
return item