Loopback 4 Connector for AWS Neptune (BETA)

Loopback 4 connector for AWS Neptune using Gremlin Graph Query Language.

This connector has the intent of connecting Loopback to AWS Neptune and use the Loopback ORM language to facilitate the use of basic operations like Create, Update and Delete. It also allows the use of audit layers and middlewares when using CRUD methods.

This connector allows you to run direct queries (raw queries) using Gremlin bytecode format with Graph Traversal Steps. It doesn't support Gremlin script execution in order to avoid injections.

It uses non-authenticated connection and IAM authentication method. You can also use this to connect to other Gremlin based GraphDB's, but it wasn't tested, so, be careful. The code used for IAM authentication was based on Lambda Example from AWS Neptune documentation.

It does support Neptune "transactions", which is called Multithreaded Gremlin Writes and runs internally in Neptune engine, it's NOT the standard Gremlin transaction, please read Neptune documentation to understand what it means.

Installing

npm install loopback-connector-neptune

Gremlin Client Version

The Gremlin Client Version is important for Neptune compatibility as you can read at Neptune engine version Docs. We're using Gremlin ^3.4.12.

Setup

Please read and follow each step of setup because all parameters must be present to have the connector working properly with GraphDB Neptune.

• 1 - Datasource
• 2 - Models
• 3 - Repositories
• 4 - CRUD methods
• 5 - Direct Query Execution (Gremlin Bytecode)
• 6 - Transaction

Debugging

DEBUG=loopback:connector:neptune npm start

Tests

You can find all tests and code examples at Loopback Neptune Connector Test Kit Repository which has a Docker environment to run functional tests using Apache TinkerPop. Note that Apache TinkerPop doesn't have the exactly same behavior of AWS Neptune, there are some limitations you must validate running the tests against a real Neptune instance. Please follow the instructions on Test Kit Repository of how to do that.

License

This connector is under MIT license which means, you can modify and distribute since your code is OpenSource and free for use by anyone.

Contributions

There are so many other tests to be created and issues to be fixed especially when new Neptune versions are released. Create a fork, do your improvements with well done comments and documentation if needed, create a pull request, and the community will be eternally grateful for your help ;)