96 lines
3.1 KiB
Python
Executable File
96 lines
3.1 KiB
Python
Executable File
#!/usr/bin/env python
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# Copyright (c) 2016 MariaDB Corporation Ab
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#
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# Use of this software is governed by the Business Source License included
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# in the LICENSE.TXT file and at www.mariadb.com/bsl11.
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#
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# Change Date: 2024-03-10
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#
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# On the date above, in accordance with the Business Source License, use
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# of this software will be governed by version 2 or later of the General
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# Public License.
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#
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# This program requires the MySQL Connector/Python to work
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#
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import mysql.connector as mysql
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import json
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import sys
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import argparse
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parser = argparse.ArgumentParser(description = "CDC Schema Generator", conflict_handler="resolve", epilog="""This program generates CDC schema files for a specific table or all the tables in a database. The
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schema files need to be generated if the binary log files do not contain the
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CREATE TABLE events that define the table layout.""")
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parser.add_argument("-h", "--host", dest="host", help="Network address where the connection is made", default="localhost")
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parser.add_argument("-P", "--port", dest="port", help="Port where the connection is made", default="3306")
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parser.add_argument("-u", "--user", dest="user", help="Username used when connecting", default="")
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parser.add_argument("-p", "--password", dest="password", help="Password used when connecting", default="")
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parser.add_argument("DATABASE", help="Generate Avro schemas for this database")
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opts = parser.parse_args(sys.argv[1:])
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def parse_field(row):
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res = dict()
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parts = row[1].lower().split('(')
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name = parts[0]
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res["real_type"] = name
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if len(parts) > 1 and name not in ["enum", "set", "decimal"]:
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res["length"] = int(parts[1].split(')')[0])
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else:
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res["length"] = -1
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type = "string"
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if name in ("date", "datetime", "time", "timestamp", "year", "tinytext", "text",
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"mediumtext", "longtext", "char", "varchar", "enum", "set"):
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type = "string"
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elif name in ("tinyblob", "blob", "mediumblob", "longblob", "binary", "varbinary"):
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type = "bytes"
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elif name in ("int", "smallint", "mediumint", "integer", "tinyint", "short", "bit"):
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type = "int"
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elif name in ("float"):
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type = "float"
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elif name in ("double", "decimal"):
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type = "double"
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elif name in ("long", "bigint"):
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type = "long"
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res["type"] = ["null", type]
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res["name"] = row[0].lower()
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return res
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try:
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conn = mysql.connect(user=opts.user, password=opts.password, host=opts.host, port=opts.port)
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cursor = conn.cursor()
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cursor.execute("SHOW TABLES FROM {}".format(opts.DATABASE))
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tables = []
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for res in cursor:
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tables.append(res[0])
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for t in tables:
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schema = dict(namespace="MaxScaleChangeDataSchema.avro", type="record", name="ChangeRecord", fields=[])
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cursor.execute("DESCRIBE {}.{}".format(opts.DATABASE, t))
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for res in cursor:
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schema["fields"].append(parse_field(res))
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dest = open("{}.{}.000001.avsc".format(opts.DATABASE, t), 'w')
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dest.write(json.dumps(schema))
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dest.close()
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cursor.close()
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conn.close()
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except Exception as e:
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print(e)
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exit(1)
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