This package provides a GraphQL API for managing communication between a Jupyter kernel and front-end clients. The package allows users to control and monitor kernels.

Through GraphQL queries and mutations, the API enables the user to launch kernels, subscribe to the status of a kernel, send Jupyter messages from a client to a kernel, and more.

The architecture diagram below shows how the kernel-relay sits alongisde Jupyter kernels and serves clients.

$ yarn add @nteract/kernel-relay

$ npm install --save @nteract/kernel-relay

To get started developing on kernel-relay, you'll need to clone this repository.

$ git clone https://github.com/nteract/kernel-relay.git

Then, you'll need to install the dependencies within this repository.

$ yarn
OR
$ npm install

You can then run the GraphQL server with a playground UI.

$ yarn start

To run an instance of the kernel-relay within a Docker container, you can execute the following commands. Note that you will need to have Docker installed on your machine.

First, run the following in the cloned directory to build a Docker image.

$ docker build -t nteract/kernel-relay-dev:latest .

Then, run a Docker container based on this image.

$ docker run  -p 4000:4000 -t nteract/kernel-relay-dev:latest

Next, navigate to https://localhost:4000 in your browser to interact with the instance of the kernel-relay running within your Docker container.

The query example below showcases how to use the GraphQL API to get the status of a kernel.

> query GetKernels {
  listKernelSpecs {
    name
  }
}
{
  "data": {
    "listKernelSpecs": [
      {
        "name": "python3"
      }
    ]
  }
}
> mutation StartJupyterKernel {
  startKernel(name: "python3") {
    id
    status
  }
}
{
  "data": {
    "startKernel": [
      {
        "name": "python3",
        "id": "a-uuid",
        "status": "started"
      }
    ]
  }
}

We're working on adding more documentation for this component. Stay tuned by watching this repository!

If you experience an issue while using this package or have a feature request, please file an issue on the issue board and, if possible, add the pkg:kernel-relay label.

BSD-3-Clause