private void execute(HttpAction action, InputStream input) {
// OPTIONS
if (action.request.getMethod().equals(HttpNames.METHOD_OPTIONS)) {
// Share with update via SPARQL_Protocol.
doOptions(action);
return;
}
UsingList usingList = processProtocol(action.request);
// If the dsg is transactional, then we can parse and execute the update in a streaming fashion.
// If it isn't, we need to read the entire update request before performing any updates, because
// we have to attempt to make the request atomic in the face of malformed queries
UpdateRequest req = null;
if (!action.isTransactional()) {
try {
// TODO implement a spill-to-disk version of this
req = UpdateFactory.read(usingList, input, UpdateParseBase, Syntax.syntaxARQ);
} catch (UpdateException ex) {
ServletOps.errorBadRequest(ex.getMessage());
return;
} catch (QueryParseException ex) {
ServletOps.errorBadRequest(messageForQueryException(ex));
return;
}
}
action.beginWrite();
try {
if (req == null)
UpdateAction.parseExecute(
usingList, action.getActiveDSG(), input, UpdateParseBase, Syntax.syntaxARQ);
else UpdateAction.execute(req, action.getActiveDSG());
action.commit();
} catch (UpdateException ex) {
action.abort();
incCounter(action.getEndpoint().getCounters(), UpdateExecErrors);
ServletOps.errorOccurred(ex.getMessage());
} catch (QueryParseException | QueryBuildException ex) {
action.abort();
// Counter inc'ed further out.
ServletOps.errorBadRequest(messageForQueryException(ex));
} catch (Throwable ex) {
if (!(ex instanceof ActionErrorException)) {
try {
action.abort();
} catch (Exception ex2) {
}
ServletOps.errorOccurred(ex.getMessage(), ex);
}
} finally {
action.endWrite();
}
}
private static Node createNode(String x) {
try {
IRI iri = resolver.resolve(x);
return NodeFactory.createURI(iri.toString());
} catch (Exception ex) {
ServletOps.errorBadRequest("SPARQL Update: bad IRI: " + x);
return null;
}
}
protected void execute(String queryString, HttpAction action) {
String queryStringLog = ServletOps.formatForLog(queryString);
if (action.verbose) action.log.info(format("[%d] Query = \n%s", action.id, queryString));
else action.log.info(format("[%d] Query = %s", action.id, queryStringLog));
Query query = null;
try {
// NB syntax is ARQ (a superset of SPARQL)
query = QueryFactory.create(queryString, QueryParseBase, Syntax.syntaxARQ);
queryStringLog = formatForLog(query);
validateQuery(action, query);
} catch (ActionErrorException ex) {
throw ex;
} catch (QueryParseException ex) {
ServletOps.errorBadRequest(
"Parse error: \n" + queryString + "\n\r" + messageForQueryException(ex));
}
// Should not happen.
catch (QueryException ex) {
ServletOps.errorBadRequest("Error: \n" + queryString + "\n\r" + ex.getMessage());
}
// Assumes finished whole thing by end of sendResult.
try {
action.beginRead();
Dataset dataset = decideDataset(action, query, queryStringLog);
try (QueryExecution qExec = createQueryExecution(query, dataset); ) {
SPARQLResult result = executeQuery(action, qExec, query, queryStringLog);
// Deals with exceptions itself.
sendResults(action, result, query.getPrologue());
}
} catch (QueryParseException ex) {
// Late stage static error (e.g. bad fixed Lucene query string).
ServletOps.errorBadRequest(
"Query parse error: \n" + queryString + "\n\r" + messageForQueryException(ex));
} catch (QueryCancelledException ex) {
// Additional counter information.
incCounter(action.getEndpoint().getCounters(), QueryTimeouts);
throw ex;
} finally {
action.endRead();
}
}
@Override
protected void validate(HttpAction action) {
HttpServletRequest request = action.request;
if (HttpNames.METHOD_OPTIONS.equals(request.getMethod())) return;
if (!HttpNames.METHOD_POST.equalsIgnoreCase(request.getMethod()))
ServletOps.errorMethodNotAllowed("SPARQL Update : use POST");
ContentType ct = FusekiLib.getContentType(action);
if (ct == null) ct = ctSPARQLUpdate;
if (matchContentType(ctSPARQLUpdate, ct)) {
String charset = request.getCharacterEncoding();
if (charset != null && !charset.equalsIgnoreCase(charsetUTF8))
ServletOps.errorBadRequest("Bad charset: " + charset);
validate(action, paramsPOST);
return;
}
if (isHtmlForm(ct)) {
int x =
countParamOccurences(request, paramUpdate) + countParamOccurences(request, paramRequest);
if (x == 0) ServletOps.errorBadRequest("SPARQL Update: No 'update=' parameter");
if (x != 1) ServletOps.errorBadRequest("SPARQL Update: Multiple 'update=' parameters");
String requestStr = request.getParameter(paramUpdate);
if (requestStr == null) requestStr = request.getParameter(paramRequest);
if (requestStr == null) ServletOps.errorBadRequest("SPARQL Update: No update= in HTML form");
validate(action, paramsForm);
return;
}
ServletOps.error(
HttpSC.UNSUPPORTED_MEDIA_TYPE_415,
"Must be "
+ contentTypeSPARQLUpdate
+ " or "
+ contentTypeHTMLForm
+ " (got "
+ ct.getContentType()
+ ")");
}
@Override
protected void doGet(HttpAction action) {
// Assume success - do the set up before grabbing the lock.
// Sets content type.
MediaType mediaType = ActionLib.contentNegotationRDF(action);
ServletOutputStream output;
try {
output = action.response.getOutputStream();
} catch (IOException ex) {
ServletOps.errorOccurred(ex);
output = null;
}
TypedOutputStream out = new TypedOutputStream(output, mediaType);
Lang lang = RDFLanguages.contentTypeToLang(mediaType.getContentType());
if (action.verbose)
action.log.info(
format(
"[%d] Get: Content-Type=%s, Charset=%s => %s",
action.id, mediaType.getContentType(), mediaType.getCharset(), lang.getName()));
action.beginRead();
setCommonHeaders(action.response);
try {
Target target = determineTarget(action);
if (action.log.isDebugEnabled()) action.log.debug("GET->" + target);
boolean exists = target.exists();
if (!exists) ServletOps.errorNotFound("No such graph: <" + target.name + ">");
// If we want to set the Content-Length, we need to buffer.
// response.setContentLength(??) ;
String ct = lang.getContentType().toHeaderString();
action.response.setContentType(ct);
Graph g = target.graph();
// Special case RDF/XML to be the plain (faster, less readable) form
RDFFormat fmt =
(lang == Lang.RDFXML)
? RDFFormat.RDFXML_PLAIN
: RDFWriterRegistry.defaultSerialization(lang);
try {
RDFDataMgr.write(out, g, fmt);
} catch (JenaException ex) {
// Some RDF/XML data is unwritable. All we can do is pretend it's a bad
// request (inappropriate content type).
// Good news - this happens before any output for RDF/XML-ABBREV.
if (fmt.getLang().equals(Lang.RDFXML))
ServletOps.errorBadRequest("Failed to write output in RDF/XML: " + ex.getMessage());
else ServletOps.errorOccurred("Failed to write output: " + ex.getMessage(), ex);
}
ServletOps.success(action);
} finally {
action.endRead();
}
}
/**
* Helper method for validating request.
*
* @param request HTTP request
* @param params parameters in a collection of Strings
*/
protected void validateParams(HttpAction action, Collection<String> params) {
HttpServletRequest request = action.request;
ContentType ct = FusekiLib.getContentType(request);
boolean mustHaveQueryParam = true;
if (ct != null) {
String incoming = ct.getContentType();
if (matchContentType(ctSPARQLQuery, ct)) {
mustHaveQueryParam = false;
// Drop through.
} else if (matchContentType(ctHTMLForm, ct)) {
// Nothing specific to do
} else ServletOps.error(HttpSC.UNSUPPORTED_MEDIA_TYPE_415, "Unsupported: " + incoming);
}
// GET/POST of a form at this point.
if (mustHaveQueryParam) {
int N = countParamOccurences(request, paramQuery);
if (N == 0) ServletOps.errorBadRequest("SPARQL Query: No 'query=' parameter");
if (N > 1) ServletOps.errorBadRequest("SPARQL Query: Multiple 'query=' parameters");
// application/sparql-query does not use a query param.
String queryStr = request.getParameter(HttpNames.paramQuery);
if (queryStr == null)
ServletOps.errorBadRequest("SPARQL Query: No query specified (no 'query=' found)");
if (queryStr.isEmpty()) ServletOps.errorBadRequest("SPARQL Query: Empty query string");
}
if (params != null) {
Enumeration<String> en = request.getParameterNames();
for (; en.hasMoreElements(); ) {
String name = en.nextElement();
if (!params.contains(name))
ServletOps.warning(
action, "SPARQL Query: Unrecognize request parameter (ignored): " + name);
}
}
}
/**
* Perform the {@link QueryExecution} once.
*
* @param action
* @param queryExecution
* @param query
* @param queryStringLog Informational string created from the initial query.
* @return
*/
protected SPARQLResult executeQuery(
HttpAction action, QueryExecution queryExecution, Query query, String queryStringLog) {
setAnyTimeouts(queryExecution, action);
if (query.isSelectType()) {
ResultSet rs = queryExecution.execSelect();
// Force some query execution now.
// If the timeout-first-row goes off, the output stream has not
// been started so the HTTP error code is sent.
rs.hasNext();
// If we wanted perfect query time cancellation, we could consume
// the result now to see if the timeout-end-of-query goes off.
// rs = ResultSetFactory.copyResults(rs) ;
// action.log.info(format("[%d] exec/select", action.id)) ;
return new SPARQLResult(rs);
}
if (query.isConstructType()) {
Dataset dataset = queryExecution.execConstructDataset();
// action.log.info(format("[%d] exec/construct", action.id));
return new SPARQLResult(dataset);
}
if (query.isDescribeType()) {
Model model = queryExecution.execDescribe();
// action.log.info(format("[%d] exec/describe", action.id)) ;
return new SPARQLResult(model);
}
if (query.isAskType()) {
boolean b = queryExecution.execAsk();
// action.log.info(format("[%d] exec/ask", action.id)) ;
return new SPARQLResult(b);
}
ServletOps.errorBadRequest("Unknown query type - " + queryStringLog);
return null;
}