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76 lines
2.1 KiB
76 lines
2.1 KiB
#!/home/alpcentaur/ProjektA/PrototypeWebApp/venv/bin/python3.5
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import argparse
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import errno
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import os
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import boto
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from boto.compat import json
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from boto.compat import six
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DESCRIPTION = """Dump the contents of one or more DynamoDB tables to the local filesystem.
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Each table is dumped into two files:
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- {table_name}.metadata stores the table's name, schema and provisioned
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throughput.
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- {table_name}.data stores the table's actual contents.
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Both files are created in the current directory. To write them somewhere else,
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use the --out-dir parameter (the target directory will be created if needed).
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"""
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def dump_table(table, out_dir):
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metadata_file = os.path.join(out_dir, "%s.metadata" % table.name)
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data_file = os.path.join(out_dir, "%s.data" % table.name)
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with open(metadata_file, "w") as metadata_fd:
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json.dump(
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{
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"name": table.name,
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"schema": table.schema.dict,
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"read_units": table.read_units,
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"write_units": table.write_units,
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},
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metadata_fd
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)
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with open(data_file, "w") as data_fd:
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for item in table.scan():
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# JSON can't serialize sets -- convert those to lists.
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data = {}
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for k, v in six.iteritems(item):
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if isinstance(v, (set, frozenset)):
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data[k] = list(v)
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else:
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data[k] = v
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data_fd.write(json.dumps(data))
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data_fd.write("\n")
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def dynamodb_dump(tables, out_dir):
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try:
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os.makedirs(out_dir)
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except OSError as e:
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# We don't care if the dir already exists.
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if e.errno != errno.EEXIST:
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raise
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conn = boto.connect_dynamodb()
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for t in tables:
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dump_table(conn.get_table(t), out_dir)
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if __name__ == "__main__":
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parser = argparse.ArgumentParser(
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prog="dynamodb_dump",
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description=DESCRIPTION
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)
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parser.add_argument("--out-dir", default=".")
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parser.add_argument("tables", metavar="TABLES", nargs="+")
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namespace = parser.parse_args()
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dynamodb_dump(namespace.tables, namespace.out_dir)
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