Adds very basic SPARQL evaluation fuzzer

Cargo.lock

@@ -40,6 +40,15 @@ version = "1.0.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "216261ddc8289130e551ddcd5ce8a064710c0d064a4d2895c67151c92b5443f6"
 
+[[package]]
+name = "arbitrary"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a7924531f38b1970ff630f03eb20a2fde69db5c590c93b0f3482e95dcc5fd60"
+dependencies = [
+ "derive_arbitrary",
+]
+
 [[package]]
 name = "assert_cmd"
 version = "2.0.6"
@@ -414,6 +423,17 @@ dependencies = [
  "typenum",
 ]
 
+[[package]]
+name = "derive_arbitrary"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c9a577516173adb681466d517d39bd468293bc2c2a16439375ef0f35bba45f3d"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "difflib"
 version = "0.4.0"
@@ -1587,6 +1607,13 @@ dependencies = [
  "rand",
 ]
 
+[[package]]
+name = "sparql-smith"
+version = "0.1.0-alpha.1"
+dependencies = [
+ "arbitrary",
+]
+
 [[package]]
 name = "spin"
 version = "0.5.2"

Cargo.toml

@@ -5,6 +5,7 @@ members = [
     "lib/oxrdf",
     "lib/spargebra",
     "lib/sparesults",
+    "lib/sparql-smith",
     "python",
     "oxrocksdb-sys",
     "server",

fuzz/Cargo.toml

@@ -9,12 +9,19 @@ edition = "2021"
 cargo-fuzz = true
 
 [dependencies]
+lazy_static = "1"
 libfuzzer-sys = "0.4"
 spargebra = { path = "../lib/spargebra", features = ["rdf-star"] }
 sparesults = { path = "../lib/sparesults", features = ["rdf-star"] }
+sparql-smith = { path = "../lib/sparql-smith" }
+oxigraph = { path = "../lib" }
 
 [workspace]
 
+[[bin]]
+name = "sparql_eval"
+path = "fuzz_targets/sparql_eval.rs"
+
 [[bin]]
 name = "sparql_query"
 path = "fuzz_targets/sparql_query.rs"

fuzz/fuzz_targets/sparql_eval.rs

@@ -0,0 +1,26 @@
+#![no_main]
+use lazy_static::lazy_static;
+use libfuzzer_sys::fuzz_target;
+use oxigraph::io::DatasetFormat;
+use oxigraph::sparql::Query;
+use oxigraph::store::Store;
+
+lazy_static! {
+    static ref STORE: Store = {
+        let store = Store::new().unwrap();
+        store
+            .load_dataset(
+                sparql_smith::DATA_TRIG.as_bytes(),
+                DatasetFormat::TriG,
+                None,
+            )
+            .unwrap();
+        store
+    };
+}
+
+fuzz_target!(|data: sparql_smith::Query| {
+    if let Ok(q) = Query::parse(&data.to_string(), None) {
+        STORE.query(q).unwrap();
+    }
+});

fuzz/fuzz_targets/sparql_query.rs

@@ -1,10 +1,7 @@
 #![no_main]
 use libfuzzer_sys::fuzz_target;
 use spargebra::Query;
-use std::str;
 
-fuzz_target!(|data: &[u8]| {
+fuzz_target!(|data: &str| {
-    if let Ok(data) = str::from_utf8(data) {
     Query::parse(data, None);
-    }
 });

fuzz/fuzz_targets/sparql_update.rs

@@ -3,8 +3,6 @@ use libfuzzer_sys::fuzz_target;
 use spargebra::Update;
 use std::str;
 
-fuzz_target!(|data: &[u8]| {
+fuzz_target!(|data: &str| {
-    if let Ok(data) = str::from_utf8(data) {
     Update::parse(data, None);
-    }
 });

lib/sparql-smith/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "sparql-smith"
+version = "0.1.0-alpha.1"
+authors = ["Tpt <thomas@pellissier-tanon.fr>"]
+license = "MIT OR Apache-2.0"
+readme = "README.md"
+keywords = ["SPARQL"]
+repository = "https://github.com/oxigraph/oxigraph/tree/main/lib/sparql-smith"
+homepage = "https://oxigraph.org/"
+description = """
+A SPARQL test cases generator
+"""
+edition = "2021"
+
+[dependencies]
+arbitrary = { version = "1", features = ["derive"] }

lib/sparql-smith/README.md

@@ -0,0 +1,44 @@
+SPARQL smith
+============
+
+[![Latest Version](https://img.shields.io/crates/v/sparql-smith.svg)](https://crates.io/crates/sparql-smith)
+[![Released API docs](https://docs.rs/sparql-smith/badge.svg)](https://docs.rs/sparql-smith)
+[![Crates.io downloads](https://img.shields.io/crates/d/sparql-smith)](https://crates.io/crates/sparql-smith)
+[![actions status](https://github.com/oxigraph/oxigraph/workflows/build/badge.svg)](https://github.com/oxigraph/oxigraph/actions)
+[![Gitter](https://badges.gitter.im/oxigraph/community.svg)](https://gitter.im/oxigraph/community?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
+
+sparql-smith is a test case generator for the [SPARQL](https://www.w3.org/TR/sparql11-overview/) language.
+
+It provides a single struct, `Query` that could be serialized to a SPARQL query using `to_string()`.
+
+The queries generated are sadly not always valid. Variables scopes are not properly handled yet.
+All SPARQL features are not supported yet.
+
+The `DATA_TRIG` constant is provided as an example dataset on which queries could be evaluated.
+
+Usage example with [libfuzzer-sys](https://docs.rs/libfuzzer-sys) and [spargebra](https://docs.rs/spargebra):
+
+```rust
+#![no_main]
+use libfuzzer_sys::fuzz_target;
+
+fuzz_target!(|data: sparql_smith::Query| {
+    spargebra::Query::parse(&data.to_string(), None).unwrap()
+});
+```
+
+## License
+
+This project is licensed under either of
+
+* Apache License, Version 2.0, ([LICENSE-APACHE](../LICENSE-APACHE) or
+  `<http://www.apache.org/licenses/LICENSE-2.0>`)
+* MIT license ([LICENSE-MIT](../LICENSE-MIT) or
+  `<http://opensource.org/licenses/MIT>`)
+
+at your option.
+
+
+### Contribution
+
+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.