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231 lines
8.5 KiB
231 lines
8.5 KiB
6 years ago
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extern crate gotham;
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#[macro_use]
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extern crate gotham_derive;
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extern crate futures;
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extern crate hyper;
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extern crate mime;
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extern crate rudf;
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extern crate serde;
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extern crate url;
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#[macro_use]
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extern crate serde_derive;
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#[macro_use]
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extern crate failure;
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extern crate clap;
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use clap::App;
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use clap::Arg;
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use futures::future;
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use futures::Future;
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use futures::Stream;
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use gotham::handler::{HandlerFuture, IntoHandlerError};
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use gotham::helpers::http::response::create_response;
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use gotham::middleware::state::StateMiddleware;
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use gotham::pipeline::single::single_pipeline;
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use gotham::pipeline::single_middleware;
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use gotham::router::builder::build_router;
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use gotham::router::builder::DefineSingleRoute;
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use gotham::router::builder::DrawRoutes;
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use gotham::router::Router;
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use gotham::state::FromState;
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use gotham::state::State;
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use hyper::header::CONTENT_TYPE;
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use hyper::Body;
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use hyper::HeaderMap;
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use hyper::Response;
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use hyper::StatusCode;
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use rudf::model::Dataset;
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use rudf::model::Graph;
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use rudf::rio::ntriples::read_ntriples;
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use rudf::sparql::xml_results::write_xml_results;
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use rudf::sparql::PreparedQuery;
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use rudf::sparql::SparqlDataset;
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use rudf::store::MemoryDataset;
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use std::fs::File;
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use std::sync::Arc;
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use url::form_urlencoded;
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pub fn main() -> Result<(), failure::Error> {
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let matches = App::new("Rudf SPARQL server")
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.arg(
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Arg::with_name("bind")
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.short("b")
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.long("bind")
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.help("Specify a server socket to bind using the format $(HOST):$(PORT)")
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.takes_value(true),
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).arg(
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Arg::with_name("ntriples")
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.long("ntriples")
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.help("Load a N-Triples file in the server at startup")
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.takes_value(true),
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).get_matches();
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let dataset = MemoryDataset::default();
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if let Some(nt_file) = matches.value_of("ntriples") {
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println!("Loading NTriples file {}", nt_file);
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let default_graph = dataset.default_graph();
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for quad in read_ntriples(File::open(nt_file)?) {
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default_graph.insert(&quad?)?
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}
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}
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let addr = matches.value_of("bind").unwrap_or("127.0.0.1:7878");
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println!("Listening for requests at http://{}", addr);
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gotham::start(addr.to_string(), router(dataset));
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Ok(())
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}
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fn router(dataset: MemoryDataset) -> Router {
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let store = SparqlStore::new(dataset);
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let middleware = StateMiddleware::new(store);
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let pipeline = single_middleware(middleware);
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let (chain, pipelines) = single_pipeline(pipeline);
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build_router(chain, pipelines, |route| {
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route.associate("/query", |assoc| {
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assoc
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.get()
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.with_query_string_extractor::<QueryRequest>()
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.to(|mut state: State| -> (State, Response<Body>) {
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let parsed_request = QueryRequest::take_from(&mut state);
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let response =
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evaluate_sparql_query(&mut state, &parsed_request.query.as_bytes());
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(state, response)
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});
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assoc.post().to(|mut state: State| -> Box<HandlerFuture> {
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Box::new(
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Body::take_from(&mut state)
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.concat2()
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.then(|body| match body {
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Ok(body) => {
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let response = match HeaderMap::borrow_from(&state)
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.get(CONTENT_TYPE)
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.cloned()
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{
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Some(content_type) => {
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if content_type == "application/sparql-query" {
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evaluate_sparql_query(&mut state, &body.into_bytes())
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} else if content_type
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== "application/x-www-form-urlencoded"
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{
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match parse_urlencoded_query_request(&body.into_bytes())
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{
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Ok(parsed_request) => evaluate_sparql_query(
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&mut state,
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&parsed_request.query.as_bytes(),
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),
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Err(error) => error_to_response(
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&state,
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&error,
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StatusCode::BAD_REQUEST,
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),
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}
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} else {
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error_to_response(
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&state,
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&format_err!(
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"Unsupported Content-Type: {:?}",
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content_type
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),
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StatusCode::BAD_REQUEST,
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)
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}
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}
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None => error_to_response(
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&state,
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&format_err!(
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"The request should contain a Content-Type header"
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),
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StatusCode::BAD_REQUEST,
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),
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};
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future::ok((state, response))
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}
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Err(e) => future::err((state, e.into_handler_error())),
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}),
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)
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});
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})
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})
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}
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#[derive(Clone, StateData)]
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struct SparqlStore(Arc<MemoryDataset>);
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impl SparqlStore {
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fn new(dataset: MemoryDataset) -> Self {
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SparqlStore(Arc::new(dataset))
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}
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}
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impl AsRef<MemoryDataset> for SparqlStore {
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fn as_ref(&self) -> &MemoryDataset {
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&*self.0
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}
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}
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#[derive(Deserialize, StateData, StaticResponseExtender)]
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struct QueryRequest {
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query: String,
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}
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fn parse_urlencoded_query_request(query: &[u8]) -> Result<QueryRequest, failure::Error> {
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form_urlencoded::parse(query)
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.find(|(key, _)| key == "query")
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.map(|(_, value)| QueryRequest {
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query: value.to_string(),
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}).ok_or_else(|| format_err!("'query' parameter not found"))
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}
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fn evaluate_sparql_query(state: &mut State, query: &[u8]) -> Response<Body> {
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let dataset = SparqlStore::take_from(state);
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match dataset.as_ref().prepare_query(query) {
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Ok(query) => match query.exec() {
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Ok(result) => create_response(
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&state,
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StatusCode::OK,
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"application/sparql-results+xml".parse().unwrap(),
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write_xml_results(result, Vec::default()).unwrap(),
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),
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Err(error) => error_to_response(&state, &error, StatusCode::INTERNAL_SERVER_ERROR),
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},
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Err(error) => error_to_response(&state, &error, StatusCode::BAD_REQUEST),
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}
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}
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fn error_to_response(state: &State, error: &failure::Error, code: StatusCode) -> Response<Body> {
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create_response(state, code, mime::TEXT_PLAIN_UTF_8, error.to_string())
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use gotham::test::TestServer;
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use mime::Mime;
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use std::str::FromStr;
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#[test]
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fn get_query() {
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let test_server = TestServer::new(router(MemoryDataset::default())).unwrap();
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let response = test_server
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.client()
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.get("http://localhost/query?query=SELECT+*+WHERE+{+?s+?p+?o+}")
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.perform()
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.unwrap();
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assert_eq!(response.status(), StatusCode::OK);
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}
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#[test]
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fn post_query() {
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let test_server = TestServer::new(router(MemoryDataset::default())).unwrap();
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let response = test_server
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.client()
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.post(
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"http://localhost/query",
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"SELECT * WHERE { ?s ?p ?o }",
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Mime::from_str("application/sparql-query").unwrap(),
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).perform()
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.unwrap();
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assert_eq!(response.status(), StatusCode::OK);
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}
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}
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