A demo application illustrating Neptune Graph DB queries running locally using LocalStack. The sample creates a Neptune cluster, connects to it via Gremlin, and performs graph operations — adding vertices and querying the graph — all without connecting to AWS.

• A valid LocalStack for AWS license. Your license provides a LOCALSTACK_AUTH_TOKEN to activate LocalStack.
• Docker
• localstack CLI
• awslocal CLI
• Python 3

make check

make install

export LOCALSTACK_AUTH_TOKEN=<your-auth-token>
make start

make run

The script creates a Neptune cluster, connects via Gremlin WebSocket, submits values, adds vertices to the graph, and queries the results.

You should see output similar to:

Creating Neptune Graph DB cluster "cluster123" - this may take a few moments ...
Connecting to Neptune Graph DB cluster URL: ws://localhost:4510/gremlin
Submitting values: [1,2,3,4]
Received values from cluster: [1, 2, 3, 4]
Existing vertices in the graph: []
Adding new vertices "v1" and "v2" to the graph
New list of vertices in the graph: [v[0], v[3]]
Deleting Neptune Graph DB cluster "cluster123"

Note: When running the scenario consecutively, it may take some time to free the port used by Neptune.

This code is available under the Apache 2.0 license.