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https://github.com/bspeice/metrik
synced 2024-11-04 22:48:11 -05:00
Add a merge
command to do a simple left-right merge
I'm running this off a RPi at the moment, this is needed to get around the 2GB limit on a 32-bit MongoDB
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metrik/merge.py
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47
metrik/merge.py
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from pymongo import MongoClient
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import logging
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import argparse
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def open_connection(host, port):
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return MongoClient(host=host, port=port)
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def merge(con1, con2, database_name='metrik'):
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database1 = con1[database_name]
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database2 = con2[database_name]
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collections = database1.collection_names()
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for collection_name in collections:
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collection1 = database1[collection_name]
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collection2 = database2[collection_name]
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for item in collection1.find():
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if collection2.find({'_id': item['_id']}) is None:
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collection2.save(item)
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collection1.delete_one({'_id': item['_id']})
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else:
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logging.warning('Not moving item {} as the same ID already'
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' exists in the `right` database.'.format(
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item['_id']
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))
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def main():
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parser = argparse.ArgumentParser()
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parser.add_argument('-h', '--host-1', dest='host1',
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help='The `left` database to copy from')
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parser.add_argument('-g', '--host-2', dest='host2',
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help='The `right` database to copy into')
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parser.add_argument('-p', '--port-1', default=27017, dest='port1', type=int,
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help='The port number of the `left` database')
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parser.add_argument('-o', '--port-2', default=27017, dest='port2', type=int,
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help='The port number of the `right` database')
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parser.add_argument('-d', '--database', default='metrik',
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help='The database to merge from one host to the other')
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args = parser.parse_args()
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con1 = open_connection(args.host1, args.port1)
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con2 = open_connection(args.host2, args.port2)
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merge(con1, con2, args.database)
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if __name__ == '__main__':
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main()
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