def __init__(self):
self.services = dict()
+ self.dcs = dict()
+ self.vnf_counter = 0 # used to generate short names for VNFs (Mininet limitation)
LOG.info("Create SONATA dummy gatekeeper.")
def register_service_package(self, service_uuid, service):
# lets perform all steps needed to onboard the service
service.onboard()
+ def get_next_vnf_name(self):
+ self.vnf_counter += 1
+ return "sonvnf%d" % self.vnf_counter
+
class Service(object):
"""
self.local_docker_files = dict()
self.instances = dict()
- def start_service(self, service_uuid):
- # TODO implement method
- # 1. parse descriptors
- # 2. do the corresponding dc.startCompute(name="foobar") calls
- # 3. store references to the compute objects in self.instantiations
- pass
-
def onboard(self):
"""
Do all steps to prepare this service to be instantiated
LOG.info("On-boarded service: %r" % self.manifest.get("package_name"))
+ def start_service(self):
+ """
+ This methods creates and starts a new service instance.
+ It computes placements, iterates over all VNFDs, and starts
+ each VNFD as a Docker container in the data center selected
+ by the placement algorithm.
+ :return:
+ """
+ LOG.info("Starting service %r" % self.uuid)
+ # 1. each service instance gets a new uuid to identify it
+ instance_uuid = str(uuid.uuid4())
+ # build a instances dict (a bit like a NSR :))
+ self.instances[instance_uuid] = dict()
+ self.instances[instance_uuid]["vnf_instances"] = list()
+ # 2. compute placement of this service instance (adds DC names to VNFDs)
+ self._calculate_placement(FirstDcPlacement)
+ # iterate over all vnfds that we have to start
+ for vnfd in self.vnfds.itervalues():
+ # iterate over all deployment units within each VNFDs
+ for u in vnfd.get("virtual_deployment_units"):
+ # 3. get the name of the docker image to start and the assigned DC
+ docker_name = u.get("vm_image")
+ target_dc = vnfd.get("dc")
+ # 4. perform some checks to ensure we can start the container
+ assert(docker_name is not None)
+ assert(target_dc is not None)
+ if not self._check_docker_image_exists(docker_name):
+ raise Exception("Docker image %r not found. Abort." % docker_name)
+ # 5. do the dc.startCompute(name="foobar") call to run the container
+ # TODO consider flavors, and other annotations
+ vnfi = target_dc.startCompute(GK.get_next_vnf_name(), image=docker_name, flavor_name="small")
+ # 6. store references to the compute objects in self.instances
+ self.instances[instance_uuid]["vnf_instances"].append(vnfi)
+ LOG.info("Service started. Instance id: %r" % instance_uuid)
+ return instance_uuid
+
def _unpack_service_package(self):
"""
unzip *.son file and store contents in CATALOG_FOLDER/services/<service_uuid>/
# TODO implement
pass
+ def _check_docker_image_exists(self, image_name):
+ # TODO implement
+ return True
+
+ def _calculate_placement(self, algorithm):
+ """
+ Do placement by adding the a field "dc" to
+ each VNFD that points to one of our
+ data center objects known to the gatekeeper.
+ """
+ assert(len(self.vnfds) > 0)
+ assert(len(GK.dcs) > 0)
+ # instantiate algorithm an place
+ p = algorithm()
+ p.place(self.nsd, self.vnfds, GK.dcs)
+ LOG.info("Using placement algorithm: %r" % p.__class__.__name__)
+ # lets print the placement result
+ for name, vnfd in self.vnfds.iteritems():
+ LOG.info("Placed VNF %r on DC %r" % (name, str(vnfd.get("dc"))))
+
+
+"""
+Some (simple) placement algorithms
+"""
+
+
+class FirstDcPlacement(object):
+ """
+ Placement: Always use one and the same data center from the GK.dcs dict.
+ """
+ def place(self, nsd, vnfds, dcs):
+ for name, vnfd in vnfds.iteritems():
+ vnfd["dc"] = list(dcs.itervalues())[0]
+
"""
Resource definitions and API endpoints
"""
# TODO implement method (start real service)
json_data = request.get_json(force=True)
- service_uuid = json_data.get("service_uuid")
- if service_uuid is not None:
- service_instance_uuid = str(uuid.uuid4())
- LOG.info("Starting service %r" % service_uuid)
+ service_uuid = list(GK.services.iterkeys())[0] #json_data.get("service_uuid") # TODO only for quick testing
+ if service_uuid in GK.services:
+ service_instance_uuid = GK.services.get(service_uuid).start_service()
return {"service_instance_uuid": service_instance_uuid}
- return None
+ return "Service not found", 404
def get(self):
"""
api.add_resource(Instantiations, '/api/instantiations')
-def start_rest_api(host, port):
+def start_rest_api(host, port, datacenters=dict()):
+ GK.dcs = datacenters
# start the Flask server (not the best performance but ok for our use case)
app.run(host=host,
port=port,
projects / osm / vim-emu.git / blobdiff