Oxigraph

Oxigraph is a work in progress graph database implementing the SPARQL standard.

There is no released version yet. The storage format is not stable yet and may be at any time.

Its goal is to provide a compliant, safe and fast graph database based on the RocksDB and Sled key-value stores. It is written in Rust. It also provides a set of utility functions for reading, writing and processing RDF files.

It is split into multiple parts:

• The lib directory contains the database written as a Rust library.
• The python directory contains bindings to use Oxigraph in Python. See its README for the Python bindings documentation.
• The js directory contains bindings to use Oxigraph in JavaScript with the help of WebAssembly. See its README for the JS bindings documentation.
• The server directory contains a stand-alone binary of a web server implementing the SPARQL 1.1 Protocol. It uses the RocksDB key-value store.
• The wikibase directory contains a stand-alone binary of a web server able to synchronize with a Wikibase instance.

Are currently implemented:

• SPARQL 1.1 Query.
• SPARQL 1.1 Federated Query.
• Turtle, TriG, N-Triples, N-Quads and RDF XML RDF serialization formats for both data ingestion and retrieval using the Rio library.
• SPARQL Query Results XML Format and SPARQL Query Results JSON Format.

A preliminary benchmark is provided.

Run the web server

Build

You need to have a recent stable version of Rust and Cargo installed. You also need clang to build RocksDB.

If it's done, executing cargo build --release in the root directory of this repository should compile the full server after having downloaded its dependencies. It will create a fat binary in target/release/oxigraph_server.

Usage

Run ./oxigraph_server to start the server. It listen by default on localhost:7878.

The server provides an HTML UI with a form to execute SPARQL requests.

It provides the following REST actions:

• / allows to POST data to the server. For example curl -f -X POST -H 'Content-Type:application/n-triples' --data-binary "@MY_FILE.nt" http://localhost:7878/ will add the N-Triples file MY_FILE.nt to the server repository. Turtle, TriG, N-Triples, N-Quads and RDF XML are supported.
• /query allows to evaluate SPARQL queries against the server repository following the SPARQL 1.1 Protocol. For example curl -X POST -H 'Content-Type:application/sparql-query' --data 'SELECT * WHERE { ?s ?p ?o } LIMIT 10' http://localhost:7878/query. This action supports content negotiation and could return Turtle, N-Triples, RDF XML, SPARQL Query Results XML Format and SPARQL Query Results JSON Format.

Use oxigraph_server --help to see the possible options when starting the server.

Using a Docker image

Display the help menu

docker run --rm oxigraph/oxigraph --help

Run the web server

Expose the server on port 7878 of the host machine, and save data on the local ./data folder

docker run --init --rm -v $PWD/data:/data -p 7878:7878 oxigraph/oxigraph -b 0.0.0.0:7878 -f /data

You can then access it from your machine on port 7878:

# Open the GUI in a browser
firefox http://localhost:7878

# Post some data
curl http://localhost:7878 -H 'Content-Type: application/x-turtle' -d@./data.ttl

# Make a query
curl -H 'Accept: application/sparql-results+json' 'http://localhost:7878/query?query=SELECT%20*%20%7B%20%3Fs%20%3Fp%20%3Fo%20%7D%20LIMIT%2010'

You could easily build your own Docker image by running docker build -t oxigraph server -f server/Dockerfile . from the root directory.

Build

You need to have a recent stable version of Rust and Cargo installed.

If it's done, executing cargo build --release in the root directory of this repository should compile the full server after having downloaded its dependencies. It will create a fat binary in target/release/oxigraph_wikibase.

Usage

To start a server that is synchronized with test.wikidata.org you should run:

./oxigraph_wikibase --mediawiki-api=https://test.wikidata.org/w/api.php --mediawiki-base-url=https://test.wikidata.org/wiki/ --namespaces=0,120 --file=test.wikidata

It creates a SPARQL endpoint listening to localhost:7878/query that could be queried just like Blazegraph.

The configuration parameters are:

• mediawiki_api URL of the MediaWiki API to use
• mediawiki_base_url Base URL of MediaWiki pages like https://test.wikidata.org/wiki/ for test.wikidata.org or http://localhost/w/index.php?title= for "vanilla" installations.
• namespaces The ids of the Wikibase namespaces to synchronize with, separated by ,.
• file Path of where Oxigraph should store its data.

Using a Docker image

Display the help menu

docker run --rm oxigraph/oxigraph-wikibase --help

Run the web server

Expose the server on port 7878 of the host machine, and save data on the local ./data folder

docker run --init --rm -v $PWD/wikibase_data:/wikibase_data -p 7878:7878 oxigraph/oxigraph-wikibase -b 0.0.0.0:7878 -f /wikibase_data --mediawiki-api http://some.wikibase.instance/w/api.php --mediawiki-base-url http://some.wikibase.instance/wiki/

Warning: the Wikibase instance needs to be accessible from within the container. The clean way to do that could be to have both your wikibase and oxigraph_wikibase in the same docker-compose.yml.

You could easily build your own Docker image by running docker build -t oxigraph-wikibase -f wikibase/Dockerfile . from the root directory.

License

This project is licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in Futures by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.