Python: adds Store.bulk_extend

lib/src/storage/mod.rs

@@ -1237,9 +1237,9 @@ impl StorageBulkLoader {
     }
 
     #[allow(clippy::trait_duplication_in_bounds)]
-    pub fn load<EI, EO: From<StorageError> + From<EI>, I: IntoIterator<Item = Result<Quad, EI>>>(
+    pub fn load<EI, EO: From<StorageError> + From<EI>>(
         &self,
-        quads: I,
+        quads: impl IntoIterator<Item = Result<Quad, EI>>,
     ) -> Result<(), EO> {
         let system = System::new_all();
         let cpu_count = min(4, system.physical_core_count().unwrap_or(2));

lib/src/store.rs

@@ -1441,8 +1441,7 @@ impl BulkLoader {
                 .with_base_iri(base_iri)
                 .map_err(|e| ParseError::invalid_base_iri(base_iri, e))?;
         }
-        self.storage
-            .load(parser.read_quads(reader)?.filter_map(|r| match r {
+        self.load_ok_quads(parser.read_quads(reader)?.filter_map(|r| match r {
             Ok(q) => Some(Ok(q)),
             Err(e) => {
                 if let Some(callback) = &self.on_parse_error {
@@ -1499,8 +1498,7 @@ impl BulkLoader {
                 .map_err(|e| ParseError::invalid_base_iri(base_iri, e))?;
         }
         let to_graph_name = to_graph_name.into();
-        self.storage
-            .load(parser.read_triples(reader)?.filter_map(|r| match r {
+        self.load_ok_quads(parser.read_triples(reader)?.filter_map(|r| match r {
             Ok(q) => Some(Ok(q.in_graph(to_graph_name.into_owned()))),
             Err(e) => {
                 if let Some(callback) = &self.on_parse_error {
@@ -1523,9 +1521,26 @@ impl BulkLoader {
     /// Results might get weird if you delete data during the loading process.
     ///
     /// Warning: This method is optimized for speed. See [the struct](BulkLoader) documentation for more details.
-    pub fn load_quads(&self, quads: impl IntoIterator<Item = Quad>) -> Result<(), StorageError> {
+    pub fn load_quads(
+        &self,
+        quads: impl IntoIterator<Item = impl Into<Quad>>,
+    ) -> Result<(), StorageError> {
+        self.load_ok_quads(quads.into_iter().map(Ok::<_, StorageError>))
+    }
+
+    /// Adds a set of quads using the bulk loader while breaking in the middle of the process in case of error.
+    ///
+    /// Warning: This method is not atomic.
+    /// If the process fails in the middle of the file, only a part of the data may be written to the store.
+    /// Results might get weird if you delete data during the loading process.
+    ///
+    /// Warning: This method is optimized for speed. See [the struct](BulkLoader) documentation for more details.
+    pub fn load_ok_quads<EI, EO: From<StorageError> + From<EI>>(
+        &self,
+        quads: impl IntoIterator<Item = Result<impl Into<Quad>, EI>>,
+    ) -> Result<(), EO> {
         self.storage
-            .load::<StorageError, _, _>(quads.into_iter().map(Ok))
+            .load(quads.into_iter().map(|q| q.map(|q| q.into())))
     }
 }
 

python/src/store.rs

@@ -132,8 +132,11 @@ impl PyStore {
 
     /// Adds atomically a set of quads to this store.
     ///
+    /// Insertion is done in a transactional manner: either the full operation succeeds or nothing is written to the database.
+    /// The :py:func:`bulk_extend` method is also available for much faster loading of a large number of quads but without transactional guarantees.
+    ///
     /// :param quads: the quads to add.
-    /// :type quad: iterable(Quad)
+    /// :type quads: iterable(Quad)
     /// :rtype: None
     /// :raises IOError: if an I/O error happens during the quad insertion.
     ///
@@ -152,6 +155,29 @@ impl PyStore {
         })
     }
 
+    /// Adds a set of quads to this store.
+    ///
+    /// This function is designed to be as fast as possible **without** transactional guarantees.
+    /// Only a part of the data might be written to the store.
+    ///
+    /// :param quads: the quads to add.
+    /// :type quads: iterable(Quad)
+    /// :rtype: None
+    /// :raises IOError: if an I/O error happens during the quad insertion.
+    ///
+    /// >>> store = Store()
+    /// >>> store.bulk_extend([Quad(NamedNode('http://example.com'), NamedNode('http://example.com/p'), Literal('1'), NamedNode('http://example.com/g'))])
+    /// >>> list(store)
+    /// [<Quad subject=<NamedNode value=http://example.com> predicate=<NamedNode value=http://example.com/p> object=<Literal value=1 datatype=<NamedNode value=http://www.w3.org/2001/XMLSchema#string>> graph_name=<NamedNode value=http://example.com/g>>]
+    fn bulk_extend(&self, quads: &PyAny) -> PyResult<()> {
+        self.inner
+            .bulk_loader()
+            .load_ok_quads::<PyErr, PythonOrStorageError>(
+                quads.iter()?.map(|q| q?.extract::<PyQuad>()),
+            )?;
+        Ok(())
+    }
+
     /// Removes a quad from the store.
     ///
     /// :param quad: the quad to remove.
@@ -839,3 +865,28 @@ pub(crate) fn map_serializer_error(error: SerializerError) -> PyErr {
         SerializerError::Io(error) => PyIOError::new_err(error.to_string()),
     }
 }
+
+enum PythonOrStorageError {
+    Python(PyErr),
+    Storage(StorageError),
+}
+
+impl From<PyErr> for PythonOrStorageError {
+    fn from(error: PyErr) -> Self {
+        Self::Python(error)
+    }
+}
+
+impl From<StorageError> for PythonOrStorageError {
+    fn from(error: StorageError) -> Self {
+        Self::Storage(error)
+    }
+}
+impl From<PythonOrStorageError> for PyErr {
+    fn from(error: PythonOrStorageError) -> Self {
+        match error {
+            PythonOrStorageError::Python(error) => error,
+            PythonOrStorageError::Storage(error) => map_storage_error(error),
+        }
+    }
+}

python/tests/test_store.py

@@ -25,7 +25,24 @@ class TestStore(unittest.TestCase):
 
     def test_extend(self) -> None:
         store = Store()
-        store.extend((Quad(foo, bar, baz), Quad(foo, bar, baz, graph), Quad(foo, bar, baz, DefaultGraph())))
+        store.extend(
+            (
+                Quad(foo, bar, baz),
+                Quad(foo, bar, baz, graph),
+                Quad(foo, bar, baz, DefaultGraph()),
+            )
+        )
+        self.assertEqual(len(store), 2)
+
+    def test_bulk_extend(self) -> None:
+        store = Store()
+        store.bulk_extend(
+            (
+                Quad(foo, bar, baz),
+                Quad(foo, bar, baz, graph),
+                Quad(foo, bar, baz, DefaultGraph()),
+            )
+        )
         self.assertEqual(len(store), 2)
 
     def test_remove(self) -> None: