oxigraph/server

Oxigraph Server

Oxigraph Server is a standalone HTTP server providing a graph database implementing the SPARQL standard.

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

Oxigraph is in heavy development and SPARQL query evaluation has not been optimized yet.

Oxigraph provides three different installation methods for Oxigraph server.

• cargo install (multiplatform)
• A Docker image
• A Homebrew formula

It is also usable as a Rust library and as a Python library.

Oxigraph implements the following specifications:

• SPARQL 1.1 Query, SPARQL 1.1 Update, and 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, SPARQL 1.1 Query Results JSON Format and SPARQL 1.1 Query Results CSV and TSV Formats.
• SPARQL 1.1 Protocol and SPARQL 1.1 Graph Store HTTP Protocol.

A preliminary benchmark is provided.

Installation

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

To download, build and install the latest released version run cargo install oxigraph_server. There is no need to clone the git repository.

To compile the server from source, clone this git repository, and execute cargo build --release in the server directory to compile the full server after having downloaded its dependencies. It will create a fat binary in target/release/oxigraph_server.

Usage

Run oxigraph_server --location my_data_storage_directory serve to start the server where my_data_storage_directory is the directory where you want Oxigraph data to be stored in. It listens by default on localhost:7878.

The server provides an HTML UI, based on YASGUI, with a form to execute SPARQL requests.

It provides the following REST actions:

• /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.
• /update allows to execute SPARQL updates against the server repository following the SPARQL 1.1 Protocol. For example curl -X POST -H 'Content-Type: application/sparql-update' --data 'DELETE WHERE { <http://example.com/s> ?p ?o }' http://localhost:7878/update.
• /store allows to retrieve and change the server content using the SPARQL 1.1 Graph Store HTTP Protocol. For example curl -f -X POST -H 'Content-Type:application/n-triples' --data-binary "@MY_FILE.nt" http://localhost:7878/store?graph=http://example.com/g will add the N-Triples file MY_FILE.nt to the server dataset inside of the http://example.com/g named graph. Turtle, N-Triples and RDF XML are supported. It is also possible to POST, PUT and GET the complete RDF dataset on the server using RDF dataset formats (TriG and N-Quads) against the /store endpoint. For example curl -f -X POST -H 'Content-Type:application/n-quads' --data-binary "@MY_FILE.nq" http://localhost:7878/store will add the N-Quads file MY_FILE.nq to the server dataset.

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

It is also possible to load RDF data offline using bulk loading: oxigraph_server --location my_data_storage_directory load --file my_file.nq

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 --rm -v $PWD/data:/data -p 7878:7878 oxigraph/oxigraph --location /data serve --bind 0.0.0.0:7878

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/store?default -H 'Content-Type: text/turtle' -d@./data.ttl

# Make a query
curl -X POST -H 'Accept: application/sparql-results+json' -H 'Content-Type: application/sparql-query' --data 'SELECT * WHERE { ?s ?p ?o } LIMIT 10' http://localhost:7878/query

# Make an UPDATE
curl -X POST -H 'Content-Type: application/sparql-update' --data 'DELETE WHERE { <http://example.com/s> ?p ?o }' http://localhost:7878/update

Run the Web server with basic authentication

It can be useful to make Oxigraph SPARQL endpoint available publicly, with a layer of authentication to be able to add data.

To quickly use a single user/password you can define them in a .env file along the docker-compose.yaml:

cat << EOF > .env
OXIGRAPH_USER=oxigraph
OXIGRAPH_PASSWORD=oxigraphy
EOF

Start the Oxigraph server and nginx proxy for authentication with docker-compose:

docker-compose up

In case you want to have multiple users, you can comment the entrypoint: line in the docker-compose.yml file, uncomment the .htpasswd volume, then generate each user in the .htpasswd file with this command:

htpasswd -Bbn $YOUR_USER $YOUR_PASSWORD >> .htpasswd

You can find the nginx configuration in server/nginx.conf

Build the image

You could easily build your own Docker image by cloning this repository with its submodules, and going to the root folder:

git clone --recursive https://github.com/oxigraph/oxigraph.git
cd oxigraph

Then run this command to build the image locally:

docker build -t oxigraph/oxigraph .

Homebrew

Oxigraph maintains a Homebrew formula in a custom tap.

To install Oxigraph server using Homebrew do:

brew tap oxigraph/oxigraph
brew install oxigraph

It installs the oxigraph_server binary. See the usage documentation to know how to use it.

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.