def test_cant_load_a_bogus_string_into_a_model(): turtle = """ bogus ttl content """ parsed = util.load_string_into_model(turtle, fmt="turtle") assert parsed is None
def main():
args = sys.argv
if len(args) < 2:
print "Wrong number of arguments. Try `python parse_void.py http://someurl.com`"
return
# Decide format to use (default or provided)
void_format = "rdfxml"
if len(args) == 3 and len(args[2]) > 0:
void_format = args[2]
filepath = args[1]
print "Getting VoID file at %s." % filepath
# If web...
if filepath.startswith("http"):
r = requests.get(args[1])
if r.status_code != 200:
print "Status code was not 200. Was %d instead. Exiting." % r.status_code
return
void_text = r.text
else:
if not os.path.isfile(filepath):
print "Couldn't find file locally and didn't think file was a web URL (%s). Exiting." % filepath
void_text = None
with open(filepath, 'rb') as f:
void_text = f.read()
if void_text is None:
print "Failed to read in void file from %s. Exiting." % filepath
model = util.load_string_into_model(void_text, void_format)
parsed = void.parse_void_model(model)
print parsed
def test_can_load_a_string_into_a_model(): turtle = """ @base <http://example.org/> . @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . @prefix foaf: <http://xmlns.com/foaf/0.1/> . @prefix rel: <http://www.perceive.net/schemas/relationship/> . <#green-goblin> rel:enemyOf <#spiderman> ; a foaf:Person ; # in the context of the Marvel universe foaf:name "Green Goblin" . <#spiderman> rel:enemyOf <#green-goblin> ; a foaf:Person ; foaf:name "Spiderman" . """ parsed = util.load_string_into_model(turtle, fmt="turtle") assert parsed is not None
def update():
"""Update the contents of the Harvester.
Reads the registry file and does work depending on what it finds.
"""
JOB_NAME = "UPDATE"
logging.info("[%s] Job started.", JOB_NAME)
# Set up repository connection
store = Store(SESAME_HOST, SESAME_PORT)
repository = Repository(store, SESAME_REPOSITORY)
# Establish the location of the registry file
# The else case will run when not running in a container
if os.path.isfile('/glharvest/registry.yml'):
registry_filepath = '/glharvest/registry.yml'
else:
registry_filepath = 'registry.yml'
logging.info("[%s] Loading registry file from location '%s'.", JOB_NAME, registry_filepath)
if not os.path.isfile:
raise Exception("Couldn't locate the registry file at the provided path: %s. Exiting.", registry_filepath)
registry_file = registry.parse_registry_file(registry_filepath)
logging.info("[%s] Registry file parsed. %d provider(s) found.", JOB_NAME, len(registry_file))
for provider in registry_file:
logging.info("[%s] Processing provider '%s'.", JOB_NAME, provider)
# Check for VoID
if 'void' not in registry_file[provider]:
logging.error("[%s] Location of VoID dataset not found for this provider in the registry. Skipping.", JOB_NAME)
continue
voidfile = registry_file[provider]['void']
# Check for modified value
if 'modified' not in registry_file[provider]:
logging.info("[%s] Modified date(time) was not found in the registry for provider '%s'. This will force harvesting for this provider.", JOB_NAME, provider)
registry_modified = None
else:
registry_modified = registry_file[provider]['modified']
registry_modified = parse(str(registry_modified), ignoretz=True)
logging.info("[%s] Provider '%s' was last modified at '%s'.", JOB_NAME, provider, registry_modified)
# Get and parse the VoID file
logging.info("[%s] Attemting to retrieve VoID file from location %s.", JOB_NAME, voidfile)
try:
r = requests.get(voidfile)
except:
logging.error("[%s] Failed to get voidfile located at `%s`. Skipping.", JOB_NAME, voidfile)
continue
void_string_format = "rdfxml"
# Use another format is we detect a different one
if voidfile.endswith('ttl'):
void_string_format = 'turtle'
model = util.load_string_into_model(r.text, fmt=void_string_format)
void_model = void.parse_void_model(model)
for provider_dataset in void_model:
logging.info("[%s] Processing provider VoID:Dataset '%s'.", JOB_NAME, provider_dataset)
if 'modified' not in void_model[provider_dataset]:
logging.error("[%s] VoID:Dataset found in VoID dump did not have dcterms:modified value. Skipping.", JOB_NAME)
continue
if 'features' not in void_model[provider_dataset]:
logging.error("[%s] VoID:Dataset has no feature declaration. Skipping.", JOB_NAME)
continue
modified = void_model[provider_dataset]['modified']
try:
modified = parse(modified, ignoretz=True)
except:
logging.error("[%s] Failed to parse modified time string of %s. Skipping.", JOB_NAME, modified)
continue
# TODO process features
features = void_model[provider_dataset]['features']
logging.info("[%s] Found features: %s", JOB_NAME, features)
if registry_modified is not None and modified <= registry_modified:
logging.info("[%s] Provider '%s' has not been updated since last update. Continuing on to next provider in registry.", JOB_NAME, provider)
continue
# Just delete all triples in the context
# logging.info("[%s] Deleting triples in context %s.", JOB_NAME, provider)
# repository.delete_triples_about('?s', context=provider)
data_dumps = void_model[provider_dataset]['dumps']
for dump in data_dumps:
logging.info("[%s] Processing provider '%s' dataset '%s' dump '%s'.", JOB_NAME, provider, provider_dataset, dump)
# Create a temporary name for the file
outfilename = datetime.datetime.now().strftime("%s-%f")
try:
urllib.urlretrieve(dump, outfilename)
except:
logging.error("[%s] Failed to fetch the void file at '%s'. Skipping dump file.", JOB_NAME, dump)
continue
# Decide the format (from looking at the URL string)
dump_file_format = "rdfxml"
# Use another format is we detect a different one
if dump.endswith('ttl'):
dump_file_format = 'turtle'
# parser = RDF.Parser(name=dump_file_format)
# Delete triples about each subject (streaming)
# for statement in parser.parse_as_stream('file:' + outfilename):
# # Don't delete statements about non_URI subjects because
# # we can't
# if not statement.subject.is_resource():
# continue
#
# print "Deleting triples in context %s about %s." % (provider, str(statement.subject))
# r.delete_triples_about(statement.subject, context=provider)
# Import the file
logging.info("[%s] Importing temp file '%s' into named graph '%s'.", JOB_NAME, outfilename, provider)
repository.import_from_file(outfilename, context=provider, fmt=dump_file_format)
# Delete the temp file
try:
os.remove(outfilename)
except:
logging.exception("[%s] Failed to delete temporary file located at '%s'.", JOB_NAME, outfilename)
# Update registry file on disk
registry_file[provider]['modified'] = modified
registry.save_registry(registry_filepath, registry_file)