X-Git-Url: https://osm.etsi.org/gitweb/?a=blobdiff_plain;f=src%2Femuvim%2Fapi%2Fsonata%2Fdummygatekeeper.py;h=68031e494fa71fa4e0ce636a26423ce48ea6d6fb;hb=3444ae45d2b2819993cd972ffe6a572b61fce621;hp=4241e799e100832543babe5cd7a52c1eb3db7014;hpb=bdfab7e19fb25b2361346cf61c160ec56874af91;p=osm%2Fvim-emu.git

diff --git a/src/emuvim/api/sonata/dummygatekeeper.py b/src/emuvim/api/sonata/dummygatekeeper.py
index 4241e79..68031e4 100644
--- a/src/emuvim/api/sonata/dummygatekeeper.py
+++ b/src/emuvim/api/sonata/dummygatekeeper.py
@@ -28,6 +28,8 @@ class Gatekeeper(object):
 
     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):
@@ -40,6 +42,10 @@ class Gatekeeper(object):
         # 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):
     """
@@ -62,13 +68,6 @@ 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
@@ -87,6 +86,42 @@ class Service(object):
 
         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>/
@@ -163,6 +198,40 @@ class Service(object):
         # 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
@@ -217,12 +286,11 @@ class Instantiations(fr.Resource):
         """
         # 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):
         """
@@ -244,7 +312,8 @@ api.add_resource(Packages, '/api/packages')
 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,