SPARQLConnector does not work with AWS Neptune

[zednis]

summary

• using rdflib 5.0.0 SPARQLUpdateStore to connect to AWS Neptune SPARQL endpoint
• programmatic reads work
• add( ) does not work
• query( ) does not work

versions

• Python 3.9.1
• rdflib 5.0.0

code:

from rdflib.resource import Resource
from rdflib.namespace import SKOS, DCTERMS, XSD, RDFS

from rdflib.plugins.stores import sparqlstore

SPARQL_ENDPOINT = "https://dev-taxonomy-neptune-cluster.cluster-cab44ucmi0fe.us-east-1.neptune.amazonaws.com:8182/sparql"

store = sparqlstore.SPARQLUpdateStore(returnFormat='application/rdf+xml')
store.open((SPARQL_ENDPOINT, SPARQL_ENDPOINT))
store.bind("dcterms", DCTERMS)
ds = Dataset(store, default_union=True)

ds.add((DCTERMS.source, RDF.type, OWL.DatatypeProperty))

error:

  File "/Users/stephan.zednik/Projects/dhi/dhi-taxonomy-knowledge-graph-editor/example.py", line 15, in <module>
    ds.add((DCTERMS.source, RDF.type, OWL.DatatypeProperty))
  File "/usr/local/lib/python3.9/site-packages/rdflib/graph.py", line 1396, in add
    self.store.add((s, p, o), context=c, quoted=False)
  File "/usr/local/lib/python3.9/site-packages/rdflib/plugins/stores/sparqlstore.py", line 551, in add
    self.commit()
  File "/usr/local/lib/python3.9/site-packages/rdflib/plugins/stores/sparqlstore.py", line 527, in commit
    self._update('\n;\n'.join(self._edits))
  File "/usr/local/lib/python3.9/site-packages/rdflib/plugins/stores/sparqlstore.py", line 606, in _update
    SPARQLConnector.update(self, update)
  File "/usr/local/lib/python3.9/site-packages/rdflib/plugins/stores/sparqlconnector.py", line 124, in update
    res.raise_for_status()
  File "/usr/local/lib/python3.9/site-packages/requests/models.py", line 943, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 400 Client Error: Bad Request for url: https://dev-taxonomy-neptune-cluster.cluster-cab44ucmi0fe.us-east-1.neptune.amazonaws.com:8182/sparql

[nicholascar]

See https://lawlesst.github.io/notebook/rdflib-neptune.html

[gdbassett]

that example was written against rdflib 4 I think with 5, NSSPARQLWrapper no longer appears to exist and I'm unsure what it was replaced with.

[gdbassett]

I was able to make this work with RDFLIB 6.2. This errored on RDFLIB 5.0.0 due to lack of encoding (error from requests)

Based on Ted Lawless's code above:

# I _think_ these are all the imports necessary
from rdflib import URIRef, Graph, Literal
from rdflib.plugins.stores.sparqlstore import SPARQLUpdateStore
from rdflib import RDFS

# Define some basics
URL = "https://<the name of your neptune server>:8182/sparql"
NEPTUNE_DEFAULT_GRAPH = URIRef('http://aws.amazon.com/neptune/vocab/v01/DefaultNamedGraph')

#establish the connection but explicitly use 'post' (passed to sparqlconnector)
#I'm ot even sure the `method='POST'` is necessary in 6.2.
store = SPARQLUpdateStore(method='POST')
store.open((URL, URL))
ng = Graph(store, identifier=NEPTUNE_DEFAULT_GRAPH)

#  Testing out connectivity
uri = URIRef("http://sample.org/hi")
trip = (uri, RDFS.label, Literal("Statement"))
ng.add(trip)

print(ng.value(subject=uri, predicate=RDFS.label))

# Remove these
ng.remove(trip)