Import/Export Mongo Schema

Import and export mongodb schemas without copying all the data. It will extract the following meta data about a mongo database:

• Collections
• Indexes
• Cap sizes
• Schema validators

The primary use case is when you have developed an application that uses mongodb, and want to setup a new instance with the appopriate database layout. You can then provide a config.json file with your application and have this script setup the database for you without the need for extra ensureIndex calls!

This data will be stored in a json file for a database that looks something like this:

{
    "databases": {
        "test": {
            "location": {
                "indexes": [
                    {
                        "name": "_id_",
                        "keys": [
                            [
                                "_id",
                                1
                            ]
                        ]
                    },
                    {
                        "name": "pos_2dsphere",
                        "2dsphereIndexVersion": 3,
                        "keys": [
                            [
                                "pos",
                                "2dsphere"
                            ]
                        ]
                    },
                    {
                        "name": "device_1_timestamp_1",
                        "keys": [
                            [
                                "device",
                                1
                            ],
                            [
                                "timestamp",
                                1
                            ]
                        ]
                    }
                ],
                "options": {}
            },
            "users": {
                "indexes": [
                    {
                        "name": "_id_",
                        "keys": [
                            [
                                "_id",
                                1
                            ]
                        ]
                    },
                    {
                        "unique": true,
                        "name": "username_idx",
                        "keys": [
                            [
                                "username",
                                1
                            ]
                        ]
                    }
                ],
                "options": {
                    "validator": {
                        "$jsonSchema": {
                            "bsonType": "object",
                            "required": [
                                "username",
                                "password",
                                "level"
                            ],
                            "properties": {
                                "username": {
                                    "bsonType": "string",
                                    "description": "must be a string and is required"
                                },
                                "level": {
                                    "bsonType": "string",
                                    "enum": [
                                        "user",
                                        "admin",
                                        "moderator"
                                    ],
                                    "description": "must be a string"
                                },
                                "password": {
                                    "bsonType": "string",
                                    "description": "must be a bcrypt password",
                                    "pattern": "^\\$2b\\$\\d{1,2}\\$[A-Za-z0-9\\.\\/]{53}$"
                                }
                            }
                        }
                    },
                    "validationLevel": "strict",
                    "validationAction": "error"
                }
            },
            "capped": {
                "indexes": [
                    {
                        "name": "_id_",
                        "keys": [
                            [
                                "_id",
                                1
                            ]
                        ]
                    },
                    {
                        "unique": true,
                        "name": "key_1",
                        "keys": [
                            [
                                "key",
                                1
                            ]
                        ]
                    }
                ],
                "options": {
                    "capped": true,
                    "size": 64000,
                    "max": 5000,
                    "validator": {
                        "$jsonSchema": {
                            "bsonType": "object",
                            "description": "Simple key value store",
                            "required": [
                                "key",
                                "value"
                            ],
                            "properties": {
                                "key": {
                                    "bsonType": "string",
                                    "maxLength": 64.0,
                                    "description": "the key value"
                                },
                                "value": {
                                    "bsonType": "string",
                                    "description": "the associated value"
                                }
                            }
                        }
                    },
                    "validationLevel": "strict",
                    "validationAction": "error"
                }
            }
        }
    },
    "exported": "2018-07-18T17:12:43.460992"
}

Installation

pip install MongoSchemaImportExport

Usage

Make sure the user you are using to import/export has the appropriate privileges, they'll probably need to have the root role or dbOwner on the source and destination. To export your data run:

mongo-schema-export.py --uri mongodb://user:password@database.host1.com:27017/admin --databases test2,testIgnore

To import your schema run as bellow. Use --delete-col to delete collections before creating them (WARNING: this will delete your data, you cannot change an existing collection into a capped one, although, you can set a validator after creation):

mongo-schema-import.py --uri mongodb://user:password@database.host2.com:27017/admin --databases db_1,db_2 --verbose --delete-col

You will get an output like this:

Skipping: testIgnore
Creating database: test2
	Dropping collection location
	Creating collection: location
		Options {}
		Creating index: {'name': '_id_', 'keys': [['_id', 1]]}
		Creating index: {'name': 'pos_2dsphere', '2dsphereIndexVersion': 3, 'keys': [['pos', '2dsphere']]}
		Creating index: {'name': 'device_1_timestamp_1', 'keys': [['device', 1], ['timestamp', 1]]}
	Dropping collection users
	Creating collection: users
		Options {'validator': {'$jsonSchema': {'bsonType': 'object', 'required': ['username', 'password', 'level'], 'properties': {'username': {'bsonType': 'string', 'description': 'must be a string and is required'}, 'level': {'bsonType': 'string', 'enum': ['user', 'admin', 'moderator'], 'description': 'must be a string'}, 'password': {'bsonType': 'string', 'description': 'must be a bcrypt password', 'pattern': '^\\$2b\\$\\d{1,2}\\$[A-Za-z0-9\\.\\/]{53}$'}}}}, 'validationLevel': 'strict', 'validationAction': 'error'}
		Creating index: {'name': '_id_', 'keys': [['_id', 1]]}
		Creating index: {'unique': True, 'name': 'username_idx', 'keys': [['username', 1]]}
	Dropping collection capped
	Creating collection: capped
		Options {'capped': True, 'size': 64000, 'max': 5000, 'validator': {'$jsonSchema': {'bsonType': 'object', 'description': 'Simple key value store', 'required': ['key', 'value'], 'properties': {'key': {'bsonType': 'string', 'maxLength': 64.0, 'description': 'the key value'}, 'value': {'bsonType': 'string', 'description': 'the associated value'}}}}, 'validationLevel': 'strict', 'validationAction': 'error'}
		Creating index: {'name': '_id_', 'keys': [['_id', 1]]}
		Creating index: {'unique': True, 'name': 'key_1', 'keys': [['key', 1]]}

If you get permission errors, make sure your user has the right roles to read and write databases and collections.