Dgraph database backend extension for the Community Solid Server

Store data in your Solid Pod with a Dgraph Database.

Disclaimer

The schema and queries within this repository are built with the assumption that your Dgraph instance uses a custom fork of Dgraph where the predicate list feature has been re-added. This is so that we can query for any arbitrary/dynamic predicates a node may have. unigraph-dev/dgraph is an example where expand(_userpredicate_) can be used to fetch all the predicates a node has. It was used to develop this repo.

How to use Solid Dgraph

Install

From the npm package registry:

mkdir my-server
cd my-server
npm install @solid/community-server@v4.0.0 @comake/solid-dgraph

Configure

In your my-server folder (or whatever the name of your project is):

Create a config.json file from this template, and fill out your settings. The only important changes to make to the default config are to add solid-dgraph into @context and change the backend to dgraph:

-"files-scs:config/storage/backend/*.json",
+"files-csd:config/storage/backend/dgraph.json",

Optionally, you can change the connection settings for your Dgraph database by adding parameters to the DgraphDataAccessor in the @graph section such as:

{
  "@id": "urn:solid-dgraph:default:DgraphDataAccessor",
  "comment": "The configuration to connect to the Dgraph instance.",
  "DgraphDataAccessor:_configuration_connectionUri": "https://mySpecialConnectionUri",
  "DgraphDataAccessor:_configuration_grpcPort": "1234",
}

If you do not include this section, connectionUri defaults to localhost and grpcPort defaults to 9080, which are the Dgraph defaults.

Run

Execute the following command:

npx community-solid-server -c config.json -m .

Or add the command to scripts inside your package.json like so:

{
  "scripts": {
    "start": "npx community-solid-server -c config.json -m ."
  }
}

How to contribute to Solid Dgraph

Execute the following commands:

git clone https://github.com/comake/solid-dgraph.git
cd solid-dgraph
npm ci

TODO

• Add separate unit tests for DgraphClient.ts and mock it in the tests for DgraphDataAccessor
• Add option to create secure connection to Dgraph (i.e. instead of grpc.credentials.createInsecure())
• Integration tests

License

©2022-present Comake, Inc., MIT License