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275 lines
13 KiB
275 lines
13 KiB
Oxigraph Server
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===============
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[](https://crates.io/crates/oxigraph_server)
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[](https://crates.io/crates/oxigraph_server)
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[](https://anaconda.org/conda-forge/oxigraph-server)
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[](https://github.com/oxigraph/oxigraph/actions)
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[](https://gitter.im/oxigraph/community?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
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Oxigraph Server is a standalone HTTP server providing a graph database implementing the [SPARQL](https://www.w3.org/TR/sparql11-overview/) standard.
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Its goal is to provide a compliant, safe, and fast graph database based on the [RocksDB](https://rocksdb.org/) key-value store.
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It is written in Rust.
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It also provides a set of utility functions for reading, writing, and processing RDF files.
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Oxigraph is in heavy development and SPARQL query evaluation has not been optimized yet.
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Oxigraph provides different installation methods for Oxigraph server:
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* [`cargo install`](#installation) (multiplatform)
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* [A Docker image](#using-a-docker-image)
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* [A Homebrew formula](#homebrew)
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* [A conda-forge package](https://anaconda.org/conda-forge/oxigraph-server)
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* [Pre-built binaries](https://github.com/oxigraph/oxigraph/releases/latest)
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It is also usable as [a Rust library](https://crates.io/crates/oxigraph) and as [a Python library](https://pyoxigraph.readthedocs.io/).
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Oxigraph implements the following specifications:
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* [SPARQL 1.1 Query](https://www.w3.org/TR/sparql11-query/), [SPARQL 1.1 Update](https://www.w3.org/TR/sparql11-update/), and [SPARQL 1.1 Federated Query](https://www.w3.org/TR/sparql11-federated-query/).
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* [Turtle](https://www.w3.org/TR/turtle/), [TriG](https://www.w3.org/TR/trig/), [N-Triples](https://www.w3.org/TR/n-triples/), [N-Quads](https://www.w3.org/TR/n-quads/), and [RDF XML](https://www.w3.org/TR/rdf-syntax-grammar/) RDF serialization formats for both data ingestion and retrieval using the [Rio library](https://github.com/oxigraph/rio).
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* [SPARQL Query Results XML Format](http://www.w3.org/TR/rdf-sparql-XMLres/), [SPARQL 1.1 Query Results JSON Format](https://www.w3.org/TR/sparql11-results-json/) and [SPARQL 1.1 Query Results CSV and TSV Formats](https://www.w3.org/TR/sparql11-results-csv-tsv/).
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* [SPARQL 1.1 Protocol](https://www.w3.org/TR/sparql11-protocol/#query-operation) and [SPARQL 1.1 Graph Store HTTP Protocol](https://www.w3.org/TR/sparql11-http-rdf-update/).
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A preliminary benchmark [is provided](../bench/README.md).
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## Installation
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You need to have [a recent stable version of Rust and Cargo installed](https://www.rust-lang.org/tools/install).
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To download, build and install the latest released version run `cargo install oxigraph_server`.
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There is no need to clone the git repository.
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To compile the server from source, clone this git repository including its submodules (`git clone --recursive https://github.com/oxigraph/oxigraph.git`), and execute `cargo build --release` in the `server` directory to compile the full server after having downloaded its dependencies.
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It will create a fat binary in `target/release/oxigraph_server`.
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## Usage
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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. It listens by default on `localhost:7878`.
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The server provides an HTML UI, based on [YASGUI](https://yasgui.triply.cc), with a form to execute SPARQL requests.
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It provides the following REST actions:
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* `/query` allows evaluating SPARQL queries against the server repository following the [SPARQL 1.1 Protocol](https://www.w3.org/TR/sparql11-protocol/#query-operation).
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For example:
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```bash
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curl -X POST -H 'Content-Type:application/sparql-query' \
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--data 'SELECT * WHERE { ?s ?p ?o } LIMIT 10' http://localhost:7878/query
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```
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This action supports content negotiation and could return [Turtle](https://www.w3.org/TR/turtle/), [N-Triples](https://www.w3.org/TR/n-triples/), [RDF XML](https://www.w3.org/TR/rdf-syntax-grammar/), [SPARQL Query Results XML Format](http://www.w3.org/TR/rdf-sparql-XMLres/) and [SPARQL Query Results JSON Format](https://www.w3.org/TR/sparql11-results-json/).
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* `/update` allows to execute SPARQL updates against the server repository following the [SPARQL 1.1 Protocol](https://www.w3.org/TR/sparql11-protocol/#update-operation).
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For example:
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```sh
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curl -X POST -H 'Content-Type: application/sparql-update' \
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--data 'DELETE WHERE { <http://example.com/s> ?p ?o }' http://localhost:7878/update
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```
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* `/store` allows to retrieve and change the server content using the [SPARQL 1.1 Graph Store HTTP Protocol](https://www.w3.org/TR/sparql11-http-rdf-update/).
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For example:
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```sh
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curl -f -X POST -H 'Content-Type:application/n-triples' \
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-T MY_FILE.nt "http://localhost:7878/store?graph=http://example.com/g"
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```
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will add the N-Triples file `MY_FILE.nt` to the server dataset inside of the `http://example.com/g` named graph.
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[Turtle](https://www.w3.org/TR/turtle/), [N-Triples](https://www.w3.org/TR/n-triples/) and [RDF XML](https://www.w3.org/TR/rdf-syntax-grammar/) are supported.
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It is also possible to `POST`, `PUT` and `GET` the complete RDF dataset on the server using RDF dataset formats ([TriG](https://www.w3.org/TR/trig/) and [N-Quads](https://www.w3.org/TR/n-quads/)) against the `/store` endpoint.
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For example:
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```sh
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curl -f -X POST -H 'Content-Type:application/n-quads' \
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-T MY_FILE.nq http://localhost:7878/store
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```
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will add the N-Quads file `MY_FILE.nq` to the server dataset.
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Use `oxigraph_server --help` to see the possible options when starting the server.
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It is also possible to load RDF data offline using bulk loading:
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`oxigraph_server --location my_data_storage_directory load --file my_file.nq`
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## Using a Docker image
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### Display the help menu
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```sh
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docker run --rm ghcr.io/oxigraph/oxigraph --help
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```
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### Run the Webserver
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Expose the server on port `7878` of the host machine, and save data on the local `./data` folder
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```sh
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docker run --rm -v $PWD/data:/data -p 7878:7878 ghcr.io/oxigraph/oxigraph --location /data serve --bind 0.0.0.0:7878
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```
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You can then access it from your machine on port `7878`:
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```sh
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# Open the GUI in a browser
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firefox http://localhost:7878
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# Post some data
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curl http://localhost:7878/store?default -H 'Content-Type: text/turtle' -T ./data.ttl
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# Make a query
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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
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# Make an UPDATE
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curl -X POST -H 'Content-Type: application/sparql-update' --data 'DELETE WHERE { <http://example.com/s> ?p ?o }' http://localhost:7878/update
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```
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### Run the Web server with basic authentication
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It can be useful to make Oxigraph SPARQL endpoint available publicly, with a layer of authentication on `/update` to be able to add data.
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You can do so by using a nginx basic authentication in an additional docker container with `docker-compose`. First create a `nginx.conf` file:
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```nginx
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daemon off;
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events {
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worker_connections 1024;
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}
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http {
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server {
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server_name localhost;
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listen 7878;
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rewrite ^/(.*) /$1 break;
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proxy_ignore_client_abort on;
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proxy_set_header X-Real-IP $remote_addr;
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proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
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proxy_set_header Host $http_host;
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proxy_set_header Access-Control-Allow-Origin "*";
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location ~ ^(/|/query)$ {
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proxy_pass http://oxigraph:7878;
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proxy_pass_request_headers on;
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}
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location ~ ^(/update|/store)$ {
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auth_basic "Oxigraph Administrator's Area";
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auth_basic_user_file /etc/nginx/.htpasswd;
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proxy_pass http://oxigraph:7878;
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proxy_pass_request_headers on;
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}
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}
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}
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```
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Then a `docker-compose.yml` in the same folder, you can change the default user and password in the `environment` section:
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```yaml
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version: "3"
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services:
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oxigraph:
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image: ghcr.io/oxigraph/oxigraph:latest
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## To build from local source code:
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# build:
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# context: .
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# dockerfile: server/Dockerfile
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volumes:
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- ./data:/data
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nginx-auth:
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image: nginx:1.21.4
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environment:
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- OXIGRAPH_USER=oxigraph
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- OXIGRAPH_PASSWORD=oxigraphy
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volumes:
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- ./nginx.conf:/etc/nginx/nginx.conf
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## For multiple users: uncomment this line to mount a pre-generated .htpasswd
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# - ./.htpasswd:/etc/nginx/.htpasswd
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ports:
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- "7878:7878"
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entrypoint: "bash -c 'echo -n $OXIGRAPH_USER: >> /etc/nginx/.htpasswd && echo $OXIGRAPH_PASSWORD | openssl passwd -stdin -apr1 >> /etc/nginx/.htpasswd && /docker-entrypoint.sh nginx'"
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```
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Once the `docker-compose.yaml` and `nginx.conf` are ready, start the Oxigraph server and nginx proxy for authentication on http://localhost:7878:
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```sh
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docker-compose up
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```
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Then it is possible to update the graph using basic authentication mechanisms. For example with `curl`: change `$OXIGRAPH_USER` and `$OXIGRAPH_PASSWORD`, or set them as environment variables, then run this command to insert a simple triple:
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```sh
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curl -X POST -u $OXIGRAPH_USER:$OXIGRAPH_PASSWORD -H 'Content-Type: application/sparql-update' --data 'INSERT DATA { <http://example.com/s> <http://example.com/p> <http://example.com/o> }' http://localhost:7878/update
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```
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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:
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```sh
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htpasswd -Bbn $OXIGRAPH_USER $OXIGRAPH_PASSWORD >> .htpasswd
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```
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### Build the image
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You could easily build your own Docker image by cloning this repository with its submodules, and going to the root folder:
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```sh
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git clone --recursive https://github.com/oxigraph/oxigraph.git
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cd oxigraph
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```
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Then run this command to build the image locally:
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````sh
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docker build -t ghcr.io/oxigraph/oxigraph -f server/Dockerfile .
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````
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## Homebrew
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Oxigraph maintains a [Homebrew](https://brew.sh) formula in [a custom tap](https://github.com/oxigraph/homebrew-oxigraph).
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To install Oxigraph server using Homebrew do:
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```sh
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brew tap oxigraph/oxigraph
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brew install oxigraph
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```
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It installs the `oxigraph_server` binary. [See the usage documentation to know how to use it](#usage).
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## Systemd
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It is possible to run Oxigraph in the background using systemd.
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For that, you can use the following `oxigraph_server.service` file (it might be inserted into `/etc/systemd/system/` or `$HOME/.config/systemd/user`):
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```ini
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[Unit]
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Description=Oxigraph database server
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After=network-online.target
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Wants=network-online.target
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[Service]
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Type=notify
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ExecStart=/PATH/TO/oxigraph_server serve --location /PATH/TO/OXIGRAPH/DATA
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[Install]
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WantedBy=multi-user.target
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```
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## Migration guide
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### From 0.2 to 0.3
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* The cli API has been completely rewritten. To start the server run `oxigraph_server serve --location MY_STORAGE` instead of `oxigraph_server --file MY_STORAGE`.
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* Fast data bulk loading is not supported using `oxigraph_server load --location MY_STORAGE --file MY_FILE`. The file format is guessed from the extension (`.nt`, `.ttl`, `.nq`...).
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* [RDF-star](https://w3c.github.io/rdf-star/cg-spec) is now implemented.
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* All operations are now transactional using the "repeatable read" isolation level:
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the store only exposes changes that have been "committed" (i.e. no partial writes)
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and the exposed state does not change for the complete duration of a read operation (e.g. a SPARQL query) or a read/write operation (e.g. a SPARQL update).
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## Help
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Feel free to use [GitHub discussions](https://github.com/oxigraph/oxigraph/discussions) or [the Gitter chat](https://gitter.im/oxigraph/community) to ask questions or talk about Oxigraph.
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[Bug reports](https://github.com/oxigraph/oxigraph/issues) are also very welcome.
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If you need advanced support or are willing to pay to get some extra features, feel free to reach out to [Tpt](https://github.com/Tpt).
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## License
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This project is licensed under either of
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* Apache License, Version 2.0, ([LICENSE-APACHE](../LICENSE-APACHE) or
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http://www.apache.org/licenses/LICENSE-2.0)
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* MIT license ([LICENSE-MIT](../LICENSE-MIT) or
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http://opensource.org/licenses/MIT)
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at your option.
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### Contribution
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Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in Oxigraph by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
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