def query(self, query, common_prefixes=True, timeout=None, log_failure=True, preferred_media_types=None, defer=False):
original_query = query
query = self.normalize_query(query, common_prefixes)
request = urllib2.Request(self._url, urllib.urlencode({
'query': query.encode('utf-8'),
}))
if not defer:
# Pick the quickest to parse, as it will never be passed through
# verbatim.
preferred_media_types = self._supported_media_types
if preferred_media_types:
request.add_header('Accept', self._get_accept_header(preferred_media_types))
else:
request.add_header('Accept', self._accept_header)
request.add_header('User-Agent', USER_AGENTS['agent'])
if timeout:
request.add_header('Timeout', str(timeout))
start_time = time.time()
try:
logging.debug("Querying %r", self._url)
try:
response = urllib2.urlopen(request)
except urllib2.HTTPError as e:
error_content = e.read()
raise QueryError(error_content, e.code)
time_to_start = time.time() - start_time
content_type, params = response.headers.get('Content-Type', 'application/rdf+xml'), {}
if ';' in content_type:
content_type, params_ = content_type.split(';', 1)
for param in params_.split(';'):
if '=' in param:
params.__setitem__(*param.split('=', 1))
encoding = params.get('charset', 'UTF-8')
if content_type in streaming.parsers:
result = streaming.parsers[content_type](response, encoding)
else:
raise AssertionError("Unexpected content-type: %s" % content_type)
result.query = query
result.duration = time.time() - start_time
if not defer:
result = result.get()
logger.debug("SPARQL query: %r; took %.2f (%.2f) seconds\n", original_query, time.time() - start_time, time_to_start)
statsd.timing('humfrey.sparql-query.duration', (time.time() - start_time)*1000)
statsd.incr('humfrey.sparql-query.success')
return result
except Exception:
try:
(logger.error if log_failure else logger.debug)(
"Failed query: %r; took %.2f seconds", original_query, time.time() - start_time,
exc_info=1)
except UnboundLocalError:
pass
statsd.incr('humfrey.sparql-query.fail')
raise
def __iter__(self):
results = self._results
if isinstance(
results,
StreamingParser) and results.media_type == self.media_type:
statsd.incr('humfrey.streaming.pass-through.yes')
return iter(results)
else:
statsd.incr('humfrey.streaming.pass-through.no')
sparql_results_type, fields, bindings, boolean, triples = None, None, None, None, None
if isinstance(results, bool):
sparql_results_type, boolean = 'boolean', results
elif isinstance(results, SparqlResultList):
sparql_results_type, fields, bindings = 'resultset', results.fields, results
elif isinstance(results, StreamingParser):
sparql_results_type = results.get_sparql_results_type()
if sparql_results_type == 'resultset':
fields, bindings = results.get_fields(), results.get_bindings()
boolean, triples = None, None
elif sparql_results_type == 'boolean':
boolean = results.get_boolean()
fields, bindings, triples = None, None, None
elif sparql_results_type == 'graph':
triples = results.get_triples()
fields, bindings, boolean = None, None, None
# Assume iterable-ish things are graphs / lists of triples
elif isinstance(results,
(list, types.GeneratorType, rdflib.ConjunctiveGraph)):
sparql_results_type, triples = 'graph', results
elif hasattr(results, '__iter__'):
sparql_results_type, triples = 'graph', results
else:
raise TypeError("{0} object cannot be serialized".format(
type(results)))
if sparql_results_type not in self.supported_results_types:
raise TypeError(
"Unexpected results type: {0}".format(sparql_results_type))
return self._iter(sparql_results_type, fields, bindings, boolean,
triples)
def __iter__(self):
results = self._results
if isinstance(results, StreamingParser) and results.media_type == self.media_type:
statsd.incr('humfrey.streaming.pass-through.yes')
return iter(results)
else:
statsd.incr('humfrey.streaming.pass-through.no')
sparql_results_type, fields, bindings, boolean, triples = None, None, None, None, None
if isinstance(results, bool):
sparql_results_type, boolean = 'boolean', results
elif isinstance(results, SparqlResultList):
sparql_results_type, fields, bindings = 'resultset', results.fields, results
elif isinstance(results, StreamingParser):
sparql_results_type = results.get_sparql_results_type()
if sparql_results_type == 'resultset':
fields, bindings = results.get_fields(), results.get_bindings()
boolean, triples = None, None
elif sparql_results_type == 'boolean':
boolean = results.get_boolean()
fields, bindings, triples = None, None, None
elif sparql_results_type == 'graph':
triples = results.get_triples()
fields, bindings, boolean = None, None, None
# Assume iterable-ish things are graphs / lists of triples
elif isinstance(results, (list, types.GeneratorType, rdflib.ConjunctiveGraph)):
sparql_results_type, triples = 'graph', results
elif hasattr(results, '__iter__'):
sparql_results_type, triples = 'graph', results
else:
raise TypeError("{0} object cannot be serialized".format(type(results)))
if sparql_results_type not in self.supported_results_types:
raise TypeError("Unexpected results type: {0}".format(sparql_results_type))
return self._iter(sparql_results_type, fields, bindings, boolean, triples)
def query(self,
query,
common_prefixes=True,
timeout=None,
log_failure=True,
preferred_media_types=None,
defer=False):
original_query = query
query = self.normalize_query(query, common_prefixes)
request = urllib2.Request(
self._url, urllib.urlencode({
'query': query.encode('utf-8'),
}))
if not defer:
# Pick the quickest to parse, as it will never be passed through
# verbatim.
preferred_media_types = self._supported_media_types
if preferred_media_types:
request.add_header('Accept',
self._get_accept_header(preferred_media_types))
else:
request.add_header('Accept', self._accept_header)
request.add_header('User-Agent', USER_AGENTS['agent'])
if timeout:
request.add_header('Timeout', str(timeout))
start_time = time.time()
try:
logging.debug("Querying %r", self._url)
try:
response = urllib2.urlopen(request)
except urllib2.HTTPError as e:
error_content = e.read()
raise QueryError(error_content, e.code)
time_to_start = time.time() - start_time
content_type, params = response.headers.get(
'Content-Type', 'application/rdf+xml'), {}
if ';' in content_type:
content_type, params_ = content_type.split(';', 1)
for param in params_.split(';'):
if '=' in param:
params.__setitem__(*param.split('=', 1))
encoding = params.get('charset', 'UTF-8')
if content_type in streaming.parsers:
result = streaming.parsers[content_type](response, encoding)
else:
raise AssertionError("Unexpected content-type: %s" %
content_type)
result.query = query
result.duration = time.time() - start_time
if not defer:
result = result.get()
logger.debug("SPARQL query: %r; took %.2f (%.2f) seconds\n",
original_query,
time.time() - start_time, time_to_start)
statsd.timing('humfrey.sparql-query.duration',
(time.time() - start_time) * 1000)
statsd.incr('humfrey.sparql-query.success')
return result
except Exception:
try:
(logger.error if log_failure else logger.debug)(
"Failed query: %r; took %.2f seconds",
original_query,
time.time() - start_time,
exc_info=1)
except UnboundLocalError:
pass
statsd.incr('humfrey.sparql-query.fail')
raise
