def create_service_client(service, cert=None, key=None):
"""
Creates a perfSONAR service client from a I{service}.
A service can be
- Full qualified URL string: U{http://example.com:9999/service}
- L{psapi.protocol.psservice.PsService}
- L{periscope.topology.models.Service}
- L{psapi.client.ServiceClient}: just returns the same object
@param service: service to create client from.
@returns: L{psapi.client.ServiceClient}
"""
if isinstance(service, ServiceClient):
return service
if isinstance(service, str) or isinstance(service, unicode):
url = str(service)
elif isinstance(service, PsService):
url = service.accessPoint
elif isinstance(service, Service):
properties = psServiceProperties.objects.get(parent=service)
url = properties.accessPoint
else:
raise ValueError("Cannot create service client from service"
" of type: %s" % type(service))
if cert and key:
client = ServiceClient(url, cert, key)
else:
client = ServiceClient(url)
return client
def look_for_hlses(gls):
query_text = """
declare namespace nmwg="http://ggf.org/ns/nmwg/base/2.0/";
declare namespace perfsonar="http://ggf.org/ns/nmwg/tools/org/perfsonar/1.0/";
declare namespace psservice="http://ggf.org/ns/nmwg/tools/org/perfsonar/service/1.0/";
declare namespace summary="http://ggf.org/ns/nmwg/tools/org/perfsonar/service/lookup/summarization/2.0/";
for $metadata in /nmwg:store[@type="LSStore"]/nmwg:metadata
let $metadata_id := $metadata/@id
let $data := /nmwg:store[@type="LSStore"]/nmwg:data[@metadataIdRef=$metadata_id]
return
element {"nmwg:metadata"} {
attribute id {$metadata_id},
element {"perfsonar:subject"} {
$metadata/perfsonar:subject/psservice:service
},
$data/nmwg:metadata/nmwg:eventType
}
"""
xquery = XQuery(query_text)
client = ServiceClient(gls)
logger.info("Send query to gLS: '%s'" % gls)
response = client.query(xquery)
logger.info("Received result from gLS: '%s'" % gls)
return response
def query_hls(hls):
query_text = """
declare namespace nmwg="http://ggf.org/ns/nmwg/base/2.0/";
declare namespace perfsonar="http://ggf.org/ns/nmwg/tools/org/perfsonar/1.0/";
declare namespace psservice="http://ggf.org/ns/nmwg/tools/org/perfsonar/service/1.0/";
declare namespace summary="http://ggf.org/ns/nmwg/tools/org/perfsonar/service/lookup/summarization/2.0/";
for $metadata in /nmwg:store[@type="LSStore"]/nmwg:metadata
let $metadata_id := $metadata/@id
let $data := /nmwg:store[@type="LSStore"]/nmwg:data[@metadataIdRef=$metadata_id]
return
($metadata, $data)
"""
xquery = XQuery(query_text)
client = ServiceClient(hls)
logger.info("Send query to hLS: '%s'" % hls)
response = client.query(xquery)
logger.info("Received result from hLS: '%s'" % hls)
return response
