Initiate a thread to handle registry

To prevent the registry API timeout by offloading the time-consuming
registry to a thread

Change-Id: I1107bb7f3d9a11bdae4d0a5926f788bc2a534bda
Issue-ID: MULTICLOUD-554
Signed-off-by: Bin Yang <bin.yang@windriver.com>

2 files changed, 478 insertions, 362 deletions

diff --git a/share/newton_base/registration/registration.py b/share/newton_base/registration/registration.py
index 35f3b982..9aef690a 100644
--- a/share/newton_base/registration/registration.py
+++ b/share/newton_base/registration/registration.py
@@ -16,6 +16,7 @@ import logging
 import json
 import uuid
 import traceback
+import threading
 
 from keystoneauth1.exceptions import HttpError
 from rest_framework import status
@@ -33,10 +34,289 @@ logger = logging.getLogger(__name__)
 class Registry(APIView):
 
     def __init__(self):
-        self.proxy_prefix = "multicloud"
-        self.aai_base_url = "127.0.0.1"
+        if not hasattr(self, "_logger"):
+            self._logger = logger
+
+        if not hasattr(self, "register_helper") or not self.register_helper:
+            if not hasattr(self, "proxy_prefix"):
+                self.proxy_prefix = "multicloud"
+            if not hasattr(self, "AAI_BASE_URL"):
+                self.AAI_BASE_URL = "127.0.0.1"
+            self.register_helper = RegistryHelper(self.proxy_prefix or "multicloud", self.AAI_BASE_URL or "127.0.0.1")
+
+    def post(self, request, vimid=""):
+        self._logger.info("registration with vimid: %s" % vimid)
+        self._logger.debug("with data: %s" % request.data)
+
+        try:
+
+            thread1 = RegisterHelperThread(self.register_helper.registry)
+            thread1.addv0(vimid)
+            if 0 == thread1.state():
+                thread1.start()
+
+            return Response(status=status.HTTP_202_ACCEPTED)
+
+        except VimDriverNewtonException as e:
+            return Response(data={'error': e.content}, status=e.status_code)
+        except HttpError as e:
+            self._logger.error("HttpError: status:%s, response:%s" % (e.http_status, e.response.json()))
+            return Response(data=e.response.json(), status=e.http_status)
+        except Exception as e:
+            self._logger.error(traceback.format_exc())
+            return Response(
+                data={'error': str(e)},
+                status=status.HTTP_500_INTERNAL_SERVER_ERROR)
+
+    def delete(self, request, vimid=""):
+        self._logger.debug("Registration--delete::data> %s" % request.data)
+        self._logger.debug("Registration--delete::vimid > %s"% vimid)
+        try:
+
+            retcode = RegistryHelper.unregistry(vimid)
+
+            #ret_code = VimDriverUtils.delete_vim_info(vimid)
+            return Response(status=status.HTTP_204_NO_CONTENT if retcode==0 else status.HTTP_500_INTERNAL_SERVER_ERROR)
+        except VimDriverNewtonException as e:
+            return Response(data={'error': e.content}, status=e.status_code)
+        except HttpError as e:
+            self._logger.error("HttpError: status:%s, response:%s" % (e.http_status, e.response.json()))
+            return Response(data=e.response.json(), status=e.http_status)
+        except Exception as e:
+            self._logger.error(traceback.format_exc())
+            return Response(data={'error': str(e)},
+                            status=status.HTTP_500_INTERNAL_SERVER_ERROR)
+
+
+class RegistryHelper(object):
+    '''
+    Helper code to discover and register a cloud region's resource
+    '''
+
+    def __init__(self, multicloud_prefix, aai_base_url):
+        self.proxy_prefix = multicloud_prefix
+        self.aai_base_url = aai_base_url
         self._logger = logger
 
+    def registry(self, vimid=""):
+        # populate proxy identity url
+        self._update_proxy_identity_endpoint(vimid)
+
+        # prepare request resource to vim instance
+        # get token:
+        viminfo = VimDriverUtils.get_vim_info(vimid)
+        if not viminfo:
+            raise VimDriverNewtonException(
+                "There is no cloud-region with {cloud-owner}_{cloud-region-id}=%s in AAI" % vimid)
+
+        # set the default tenant since there is no tenant info in the VIM yet
+        sess = VimDriverUtils.get_session(
+            viminfo, tenant_name=viminfo['tenant'])
+
+        # step 1. discover all projects and populate into AAI
+        self._discover_tenants(vimid, sess, viminfo)
+
+        # discover all flavors
+        self._discover_flavors(vimid, sess, viminfo)
+
+        # discover all images
+        self._discover_images(vimid, sess, viminfo)
+
+        # discover all az
+        self._discover_availability_zones(vimid, sess, viminfo)
+
+        # discover all vg
+        #self._discover_volumegroups(vimid, sess, viminfo)
+
+        # discover all snapshots
+        #self._discover_snapshots(vimid, sess, viminfo)
+
+        # discover all server groups
+        #self.discover_servergroups(request, vimid, sess, viminfo)
+
+        # discover all pservers
+        #self._discover_pservers(vimid, sess, viminfo)
+
+        return 0
+
+
+    def unregistry(self, vimid=""):
+
+        # prepare request resource to vim instance
+        # get token:
+        viminfo = VimDriverUtils.get_vim_info(vimid)
+        if not viminfo:
+            raise VimDriverNewtonException(
+                "There is no cloud-region with {cloud-owner}_{cloud-region-id}=%s in AAI" % vimid)
+
+        cloud_owner, cloud_region_id = extsys.decode_vim_id(vimid)
+
+        # get the resource first
+        resource_url = ("/cloud-infrastructure/cloud-regions/"
+                        "cloud-region/%(cloud_owner)s/%(cloud_region_id)s?depth=all"
+                        % {
+                            "cloud_owner": cloud_owner,
+                            "cloud_region_id": cloud_region_id,
+                        })
+
+        # get cloud-region
+        retcode, content, status_code = \
+            restcall.req_to_aai(resource_url, "GET")
+
+        # add resource-version
+        if retcode == 0 and content:
+            cloudregiondata = json.JSONDecoder().decode(content)
+
+        # step 1. remove all tenants
+        tenants = cloudregiondata.get("tenants", None)
+        for tenant in tenants.get("tenant", []) if tenants else []:
+            # common prefix
+            aai_cloud_region = "/cloud-infrastructure/cloud-regions/cloud-region/%s/%s/tenants/tenant/%s" \
+                               % (cloud_owner, cloud_region_id, tenant['tenant-id'])
+
+            # remove all vservers
+            try:
+                # get list of vservers
+                vservers = tenant.get('vservers', {}).get('vserver', [])
+                for vserver in vservers:
+                    try:
+                        # iterate vport, except will be raised if no l-interface exist
+                        for vport in vserver['l-interfaces']['l-interface']:
+                            # delete vport
+                            vport_delete_url = aai_cloud_region + "/vservers/vserver/%s/l-interfaces/l-interface/%s?resource-version=%s" \
+                                                                  % (vserver['vserver-id'], vport['interface-name'],
+                                                                     vport['resource-version'])
+                            restcall.req_to_aai(vport_delete_url, "DELETE")
+                    except Exception as e:
+                        pass
+
+                    try:
+                        # delete vserver
+                        vserver_delete_url = aai_cloud_region + "/vservers/vserver/%s?resource-version=%s" \
+                                                                % (
+                                                                    vserver['vserver-id'], vserver['resource-version'])
+                        restcall.req_to_aai(vserver_delete_url, "DELETE")
+                    except Exception as e:
+                        continue
+
+            except Exception:
+                self._logger.error(traceback.format_exc())
+                pass
+
+            resource_url = ("/cloud-infrastructure/cloud-regions/"
+                            "cloud-region/%(cloud_owner)s/%(cloud_region_id)s/"
+                            "%(resource_type)ss/%(resource_type)s/%(resoure_id)s/"
+                            "?resource-version=%(resource-version)s"
+                            % {
+                                "cloud_owner": cloud_owner,
+                                "cloud_region_id": cloud_region_id,
+                                "resource_type": "tenant",
+                                "resoure_id": tenant["tenant-id"],
+                                "resource-version": tenant["resource-version"]
+                            })
+            # remove tenant
+            retcode, content, status_code = \
+                restcall.req_to_aai(resource_url, "DELETE")
+
+        # remove all flavors
+        flavors = cloudregiondata.get("flavors", None)
+        for flavor in flavors.get("flavor", []) if flavors else []:
+            # iterate hpa-capabilities
+            hpa_capabilities = flavor.get("hpa-capabilities", None)
+            for hpa_capability in hpa_capabilities.get("hpa-capability", []) if hpa_capabilities else []:
+                resource_url = ("/cloud-infrastructure/cloud-regions/"
+                                "cloud-region/%(cloud_owner)s/%(cloud_region_id)s/"
+                                "%(resource_type)ss/%(resource_type)s/%(resoure_id)s/"
+                                "hpa-capabilities/hpa-capability/%(hpa-capability-id)s/"
+                                "?resource-version=%(resource-version)s"
+                                % {
+                                    "cloud_owner": cloud_owner,
+                                    "cloud_region_id": cloud_region_id,
+                                    "resource_type": "flavor",
+                                    "resoure_id": flavor["flavor-id"],
+                                    "hpa-capability-id": hpa_capability["hpa-capability-id"],
+                                    "resource-version": hpa_capability["resource-version"]
+                                })
+                # remove hpa-capability
+                retcode, content, status_code = \
+                    restcall.req_to_aai(resource_url, "DELETE")
+
+            # remove flavor
+            resource_url = ("/cloud-infrastructure/cloud-regions/"
+                            "cloud-region/%(cloud_owner)s/%(cloud_region_id)s/"
+                            "%(resource_type)ss/%(resource_type)s/%(resoure_id)s/"
+                            "?resource-version=%(resource-version)s"
+                            % {
+                                "cloud_owner": cloud_owner,
+                                "cloud_region_id": cloud_region_id,
+                                "resource_type": "flavor",
+                                "resoure_id": flavor["flavor-id"],
+                                "resource-version": flavor["resource-version"]
+                            })
+
+            retcode, content, status_code = \
+                restcall.req_to_aai(resource_url, "DELETE")
+
+        # remove all images
+        images = cloudregiondata.get("images", None)
+        for image in images.get("image", []) if images else []:
+            resource_url = ("/cloud-infrastructure/cloud-regions/"
+                            "cloud-region/%(cloud_owner)s/%(cloud_region_id)s/"
+                            "%(resource_type)ss/%(resource_type)s/%(resoure_id)s/"
+                            "?resource-version=%(resource-version)s"
+                            % {
+                                "cloud_owner": cloud_owner,
+                                "cloud_region_id": cloud_region_id,
+                                "resource_type": "image",
+                                "resoure_id": image["image-id"],
+                                "resource-version": image["resource-version"]
+                            })
+            # remove image
+            retcode, content, status_code = \
+                restcall.req_to_aai(resource_url, "DELETE")
+
+        # remove all az
+
+        # remove all vg
+
+        # remove all snapshots
+        snapshots = cloudregiondata.get("snapshots", None)
+        for snapshot in snapshots.get("snapshot", []) if snapshots else []:
+            resource_url = ("/cloud-infrastructure/cloud-regions/"
+                            "cloud-region/%(cloud_owner)s/%(cloud_region_id)s/"
+                            "%(resource_type)ss/%(resource_type)s/%(resoure_id)s/"
+                            "?resource-version=%(resource-version)s"
+                            % {
+                                "cloud_owner": cloud_owner,
+                                "cloud_region_id": cloud_region_id,
+                                "resource_type": "snapshot",
+                                "resoure_id": snapshot["snapshot-id"],
+                                "resource-version": snapshot["resource-version"]
+                            })
+            # remove snapshot
+            retcode, content, status_code = \
+                restcall.req_to_aai(resource_url, "DELETE")
+
+        # remove all server groups
+
+        # remove all pservers
+
+        # remove cloud region itself
+        resource_url = ("/cloud-infrastructure/cloud-regions/"
+                        "cloud-region/%(cloud_owner)s/%(cloud_region_id)s"
+                        "?resource-version=%(resource-version)s"
+                        % {
+                            "cloud_owner": cloud_owner,
+                            "cloud_region_id": cloud_region_id,
+                            "resource-version": cloudregiondata["resource-version"]
+                        })
+        # remove cloud region
+        retcode, content, status_code = \
+            restcall.req_to_aai(resource_url, "DELETE")
+
+        return retcode, content, status_code
+
+
     def _get_list_resources(
             self, resource_url, service_type, session, viminfo,
             vimid, content_key):
@@ -972,247 +1252,82 @@ class Registry(APIView):
             self._logger.error(traceback.format_exc())
             return
 
-    def post(self, request, vimid=""):
-        self._logger.info("registration with vimid: %s" % vimid)
-        self._logger.debug("with data: %s" % request.data)
-
-        try:
-            # populate proxy identity url
-            self._update_proxy_identity_endpoint(vimid)
-
-            # prepare request resource to vim instance
-            # get token:
-            viminfo = VimDriverUtils.get_vim_info(vimid)
-            if not viminfo:
-                raise VimDriverNewtonException(
-                    "There is no cloud-region with {cloud-owner}_{cloud-region-id}=%s in AAI" % vimid)
-
-            # set the default tenant since there is no tenant info in the VIM yet
-            sess = VimDriverUtils.get_session(
-                viminfo, tenant_name=viminfo['tenant'])
 
-            # step 1. discover all projects and populate into AAI
-            self._discover_tenants(vimid, sess, viminfo)
+class RegisterHelperThread(threading.Thread):
+    '''
+    thread to register infrastructure resource into AAI
+    '''
 
-            # discover all flavors
-            self._discover_flavors(vimid, sess, viminfo)
+    def __init__(self, registry_helper):
+        threading.Thread.__init__(self)
+        self.daemon = True
+        self.duration = 0
+        self.helper = registry_helper
 
-            # discover all images
-            self._discover_images(vimid, sess, viminfo)
+        # The queue of IDs of cloud regions, format:
+        # v0: "owner1_regionid1"
+        self.queuev0 = []
 
-            # discover all az
-            self._discover_availability_zones(vimid, sess, viminfo)
+        # v1: {"cloud-owner": "owner1", "cloud-region-id": "regionid1"},
+        self.queuev1 = []
+        self.lock = threading.Lock()
 
-            # discover all vg
-            #self._discover_volumegroups(vimid, sess, viminfo)
+        self.state_ = 0  # 0: stopped, 1: started
 
-            # discover all snapshots
-            #self._discover_snapshots(vimid, sess, viminfo)
+    def addv0(self, vimid):
+        self.lock.acquire()
+        self.queuev0.append(vimid)
+        self.lock.release()
+        return len(self.queuev0)
 
-            # discover all server groups
-            #self.discover_servergroups(request, vimid, sess, viminfo)
-
-            # discover all pservers
-            #self._discover_pservers(vimid, sess, viminfo)
-
-            return Response(status=status.HTTP_202_ACCEPTED)
-
-        except VimDriverNewtonException as e:
-            return Response(data={'error': e.content}, status=e.status_code)
-        except HttpError as e:
-            self._logger.error("HttpError: status:%s, response:%s" % (e.http_status, e.response.json()))
-            return Response(data=e.response.json(), status=e.http_status)
-        except Exception as e:
-            self._logger.error(traceback.format_exc())
-            return Response(
-                data={'error': str(e)},
-                status=status.HTTP_500_INTERNAL_SERVER_ERROR)
-
-    def delete(self, request, vimid=""):
-        self._logger.debug("Registration--delete::data> %s" % request.data)
-        self._logger.debug("Registration--delete::vimid > %s"% vimid)
-        try:
-
-            # prepare request resource to vim instance
-            # get token:
-            viminfo = VimDriverUtils.get_vim_info(vimid)
-            if not viminfo:
-                raise VimDriverNewtonException(
-                    "There is no cloud-region with {cloud-owner}_{cloud-region-id}=%s in AAI" % vimid)
-
-            cloud_owner, cloud_region_id = extsys.decode_vim_id(vimid)
-
-            #get the resource first
-            resource_url = ("/cloud-infrastructure/cloud-regions/"
-                     "cloud-region/%(cloud_owner)s/%(cloud_region_id)s?depth=all"
-                     % {
-                         "cloud_owner": cloud_owner,
-                         "cloud_region_id": cloud_region_id,
-                     })
-
-            # get cloud-region
-            retcode, content, status_code = \
-                restcall.req_to_aai(resource_url, "GET")
-
-            # add resource-version
-            if retcode == 0 and content:
-                cloudregiondata = json.JSONDecoder().decode(content)
-
-            # step 1. remove all tenants
-            tenants = cloudregiondata.get("tenants", None)
-            for tenant in tenants.get("tenant", []) if tenants else []:
-                # common prefix
-                aai_cloud_region = "/cloud-infrastructure/cloud-regions/cloud-region/%s/%s/tenants/tenant/%s" \
-                                   % (cloud_owner, cloud_region_id, tenant['tenant-id'])
-
-                # remove all vservers
-                try:
-                    # get list of vservers
-                    vservers = tenant.get('vservers', {}).get('vserver', [])
-                    for vserver in vservers:
-                        try:
-                            # iterate vport, except will be raised if no l-interface exist
-                            for vport in vserver['l-interfaces']['l-interface']:
-                                # delete vport
-                                vport_delete_url = aai_cloud_region + "/vservers/vserver/%s/l-interfaces/l-interface/%s?resource-version=%s" \
-                                                                      % (vserver['vserver-id'], vport['interface-name'],
-                                                                         vport['resource-version'])
-                                restcall.req_to_aai(vport_delete_url, "DELETE")
-                        except Exception as e:
-                            pass
-
-                        try:
-                            # delete vserver
-                            vserver_delete_url = aai_cloud_region + "/vservers/vserver/%s?resource-version=%s" \
-                                                                    % (
-                                                                    vserver['vserver-id'], vserver['resource-version'])
-                            restcall.req_to_aai(vserver_delete_url, "DELETE")
-                        except Exception as e:
-                            continue
-
-                except Exception:
-                    self._logger.error(traceback.format_exc())
-                    pass
-
-                resource_url = ("/cloud-infrastructure/cloud-regions/"
-                     "cloud-region/%(cloud_owner)s/%(cloud_region_id)s/"
-                     "%(resource_type)ss/%(resource_type)s/%(resoure_id)s/"
-                     "?resource-version=%(resource-version)s"
-                     % {
-                         "cloud_owner": cloud_owner,
-                         "cloud_region_id": cloud_region_id,
-                         "resource_type": "tenant",
-                         "resoure_id": tenant["tenant-id"],
-                         "resource-version": tenant["resource-version"]
-                     })
-                # remove tenant
-                retcode, content, status_code = \
-                    restcall.req_to_aai(resource_url, "DELETE")
+    def removev0(self, vimid):
+        '''
+        remove cloud region from list
+        '''
+        self.queuev0 = [x for x in self.queuev0 if x != vimid]
 
-            # remove all flavors
-            flavors = cloudregiondata.get("flavors", None)
-            for flavor in flavors.get("flavor", []) if flavors else []:
-                # iterate hpa-capabilities
-                hpa_capabilities = flavor.get("hpa-capabilities", None)
-                for hpa_capability in hpa_capabilities.get("hpa-capability", []) if hpa_capabilities else []:
-                    resource_url = ("/cloud-infrastructure/cloud-regions/"
-                                    "cloud-region/%(cloud_owner)s/%(cloud_region_id)s/"
-                                    "%(resource_type)ss/%(resource_type)s/%(resoure_id)s/"
-                                    "hpa-capabilities/hpa-capability/%(hpa-capability-id)s/"
-                                    "?resource-version=%(resource-version)s"
-                                    % {
-                                        "cloud_owner": cloud_owner,
-                                        "cloud_region_id": cloud_region_id,
-                                        "resource_type": "flavor",
-                                        "resoure_id": flavor["flavor-id"],
-                                        "hpa-capability-id": hpa_capability["hpa-capability-id"],
-                                        "resource-version": hpa_capability["resource-version"]
-                                    })
-                    # remove hpa-capability
-                    retcode, content, status_code = \
-                        restcall.req_to_aai(resource_url, "DELETE")
+    def resetv0(self):
+        self.queuev0 = []
 
-                # remove flavor
-                resource_url = ("/cloud-infrastructure/cloud-regions/"
-                     "cloud-region/%(cloud_owner)s/%(cloud_region_id)s/"
-                     "%(resource_type)ss/%(resource_type)s/%(resoure_id)s/"
-                     "?resource-version=%(resource-version)s"
-                     % {
-                         "cloud_owner": cloud_owner,
-                         "cloud_region_id": cloud_region_id,
-                         "resource_type": "flavor",
-                         "resoure_id": flavor["flavor-id"],
-                         "resource-version": flavor["resource-version"]
-                     })
+    def countv0(self):
+        return len(self.queuev0)
 
-                retcode, content, status_code = \
-                    restcall.req_to_aai(resource_url, "DELETE")
+    def addv1(self, cloud_owner, cloud_region_id):
+        self.lock.acquire()
+        self.queuev1.append({"cloud-owner": cloud_owner, "cloud-region-id": cloud_region_id})
+        self.lock.release()
+        return len(self.queuev1)
 
-            # remove all images
-            images = cloudregiondata.get("images", None)
-            for image in images.get("image", []) if images else []:
-                resource_url = ("/cloud-infrastructure/cloud-regions/"
-                     "cloud-region/%(cloud_owner)s/%(cloud_region_id)s/"
-                     "%(resource_type)ss/%(resource_type)s/%(resoure_id)s/"
-                     "?resource-version=%(resource-version)s"
-                     % {
-                         "cloud_owner": cloud_owner,
-                         "cloud_region_id": cloud_region_id,
-                         "resource_type": "image",
-                         "resoure_id": image["image-id"],
-                         "resource-version": image["resource-version"]
-                     })
-                # remove image
-                retcode, content, status_code = \
-                    restcall.req_to_aai(resource_url, "DELETE")
+    def removev1(self, cloud_owner, cloud_region_id):
+        '''
+        remove cloud region from list
+        '''
+        self.queuev1 = [x for x in self.queuev1 if x["cloud-owner"] != cloud_owner or x["cloud-region-id"] != cloud_region_id]
 
-            # remove all az
+    def resetv1(self):
+        self.queuev1 = []
 
-            # remove all vg
+    def countv1(self):
+        return len(self.queuev1)
 
-            # remove all snapshots
-            snapshots = cloudregiondata.get("snapshots", None)
-            for snapshot in snapshots.get("snapshot", []) if snapshots else []:
-                resource_url = ("/cloud-infrastructure/cloud-regions/"
-                     "cloud-region/%(cloud_owner)s/%(cloud_region_id)s/"
-                     "%(resource_type)ss/%(resource_type)s/%(resoure_id)s/"
-                     "?resource-version=%(resource-version)s"
-                     % {
-                         "cloud_owner": cloud_owner,
-                         "cloud_region_id": cloud_region_id,
-                         "resource_type": "snapshot",
-                         "resoure_id": snapshot["snapshot-id"],
-                         "resource-version": snapshot["resource-version"]
-                     })
-                # remove snapshot
-                retcode, content, status_code = \
-                    restcall.req_to_aai(resource_url, "DELETE")
+    def state(self):
+        return self.state_
 
-            # remove all server groups
+    def run(self):
+        logger.debug("Starting registration thread")
+        self.state_ = 1
+        while self.helper and len(self.queuev0) > 0 and len(self.queuev1) > 0:
+            self.lock.acquire()
+            vimidv1 = self.queuev1.pop()
+            self.lock.release()
+            vimid = extsys.encode_vim_id(vimidv1["cloud-owner"], vimidv1["cloud-region-id"])
+            self.helper(vimid)
 
-            # remove all pservers
+            self.lock.acquire()
+            vimidv0 = self.queuev0.pop()
+            self.lock.release()
+            self.helper(vimidv0)
 
-            # remove cloud region itself
-            resource_url = ("/cloud-infrastructure/cloud-regions/"
-                 "cloud-region/%(cloud_owner)s/%(cloud_region_id)s"
-                 "?resource-version=%(resource-version)s"
-                 % {
-                     "cloud_owner": cloud_owner,
-                     "cloud_region_id": cloud_region_id,
-                     "resource-version": cloudregiondata["resource-version"]
-                 })
-            # remove cloud region
-            retcode, content, status_code = \
-                restcall.req_to_aai(resource_url, "DELETE")
+        self.state_ = 0
+        # end of processing
 
-            #ret_code = VimDriverUtils.delete_vim_info(vimid)
-            return Response(status=status.HTTP_204_NO_CONTENT if retcode==0 else status.HTTP_500_INTERNAL_SERVER_ERROR)
-        except VimDriverNewtonException as e:
-            return Response(data={'error': e.content}, status=e.status_code)
-        except HttpError as e:
-            self._logger.error("HttpError: status:%s, response:%s" % (e.http_status, e.response.json()))
-            return Response(data=e.response.json(), status=e.http_status)
-        except Exception as e:
-            self._logger.error(traceback.format_exc())
-            return Response(data={'error': str(e)},
-                            status=status.HTTP_500_INTERNAL_SERVER_ERROR)
diff --git a/share/starlingx_base/registration/registration.py b/share/starlingx_base/registration/registration.py
index e07dda85..43a6b3e1 100644
--- a/share/starlingx_base/registration/registration.py
+++ b/share/starlingx_base/registration/registration.py
@@ -26,46 +26,156 @@ from common.msapi import extsys
 from keystoneauth1.exceptions import HttpError
 from newton_base.util import VimDriverUtils
 from common.utils import restcall
+from threading import Thread
 
 logger = logging.getLogger(__name__)
-
-
 # DEBUG=True
 
 
-class Registry(newton_registration.Registry):
+# APIv0 handler upgrading: leverage APIv1 handler
+class APIv0Registry(newton_registration.Registry):
     def __init__(self):
-        super(Registry, self).__init__()
-        self.proxy_prefix = settings.MULTICLOUD_PREFIX
-        self.aai_base_url = settings.AAI_BASE_URL
+        self.register_helper = RegistryHelper(settings.MULTICLOUD_PREFIX, settings.AAI_BASE_URL)
+        super(APIv0Registry, self).__init__()
         # self._logger = logger
 
-    def _get_ovsdpdk_capabilities(self, extra_specs, viminfo):
-        instruction_capability = {}
-        feature_uuid = uuid.uuid4()
+    def post(self, request, vimid=""):
+        self._logger.info("registration with :  %s" % vimid)
 
-        instruction_capability['hpa-capability-id'] = str(feature_uuid)
-        instruction_capability['hpa-feature'] = 'ovsDpdk'
-        instruction_capability['architecture'] = 'Intel64'
-        instruction_capability['hpa-version'] = 'v1'
+        return super(APIv0Registry, self).post(request, vimid)
 
-        instruction_capability['hpa-feature-attributes'] = []
-        instruction_capability['hpa-feature-attributes'].append(
-            {'hpa-attribute-key': 'dataProcessingAccelerationLibrary',
-             'hpa-attribute-value':
-                 '{{\"value\":\"{0}\"}}'.format("v17.02")
-             })
-        return instruction_capability
+    def delete(self, request, vimid=""):
+        self._logger.debug("unregister cloud region: %s" % vimid)
+        return super(APIv0Registry, self).delete(request, vimid)
+
+
+class Registry(APIv0Registry):
+    def __init__(self):
+        super(Registry, self).__init__()
 
 
 class APIv1Registry(newton_registration.Registry):
     def __init__(self):
         super(APIv1Registry, self).__init__()
-        self.proxy_prefix = settings.MULTICLOUD_API_V1_PREFIX
-        self.aai_base_url = settings.AAI_BASE_URL
+        self.register_helper = RegistryHelper(settings.MULTICLOUD_API_V1_PREFIX, settings.AAI_BASE_URL)
+        # self._logger = logger
+
+    def post(self, request, cloud_owner="", cloud_region_id=""):
+        self._logger.info("registration with : %s, %s"
+                          % (cloud_owner, cloud_region_id))
+
+        try:
+            vimid = extsys.encode_vim_id(cloud_owner, cloud_region_id)
+            return super(APIv1Registry, self).post(request, vimid)
+
+        except HttpError as e:
+            self._logger.error("HttpError: status:%s, response:%s"
+                               % (e.http_status, e.response.json()))
+            return Response(data=e.response.json(), status=e.http_status)
+        except Exception as e:
+            self._logger.error(traceback.format_exc())
+            return Response(
+                data={'error': str(e)},
+                status=status.HTTP_500_INTERNAL_SERVER_ERROR)
+
+    def delete(self, request, cloud_owner="", cloud_region_id=""):
+        self._logger.debug("unregister cloud region: %s, %s"
+                           % (cloud_owner, cloud_region_id))
+
+        vimid = extsys.encode_vim_id(cloud_owner, cloud_region_id)
+        return super(APIv1Registry, self).delete(request, vimid)
+
+
+class RegistryHelper(newton_registration.RegistryHelper):
+    '''
+    Helper code to discover and register a cloud region's resource
+    '''
+    def __init__(self, multicloud_prefix, aai_base_url):
+        super(RegistryHelper, self).__init__(multicloud_prefix, aai_base_url)
         # self._logger = logger
 
+    def registry(self, vimid=""):
+        '''
+        extend base method
+        '''
+        viminfo = VimDriverUtils.get_vim_info(vimid)
+        cloud_extra_info_str = viminfo['cloud_extra_info']
+        cloud_extra_info = None
+        try:
+            cloud_extra_info = json.loads(cloud_extra_info_str) \
+                if cloud_extra_info_str else None
+        except Exception as ex:
+            logger.error("Can not convert cloud extra info %s %s" % (
+                str(ex), cloud_extra_info_str))
+            pass
+
+        region_specified = cloud_extra_info.get(
+            "openstack-region-id", None) if cloud_extra_info else None
+        multi_region_discovery = cloud_extra_info.get(
+            "multi-region-discovery", None) if cloud_extra_info else None
+
+        # set the default tenant since there is no tenant info in the VIM yet
+        sess = VimDriverUtils.get_session(
+            viminfo, tenant_name=viminfo['tenant'])
+
+        # discover the regions, expect it always returns a list (even empty list)
+        # cloud_owner, cloud_region_id = extsys.decode_vim_id(vimid)
+        # region_ids = self._discover_regions(cloud_owner, cloud_region_id, sess, viminfo)
+        region_ids = self._discover_regions(vimid, sess, viminfo)
+
+        if len(region_ids) == 0:
+            self._logger.warn("failed to get region id")
+
+        # compare the regions with region_specified and then cloud_region_id
+        if region_specified in region_ids:
+            pass
+        elif cloud_region_id in region_ids:
+            region_specified = cloud_region_id
+            pass
+        else:
+            # assume the first region be the primary region
+            # since we have no other way to determine it.
+            region_specified = region_ids.pop(0)
+
+        # update cloud region and discover/register resource
+        if multi_region_discovery:
+            # no input for specified cloud region,
+            # so discover all cloud region
+            for regionid in region_ids:
+                # do not update the specified region here
+                if region_specified == regionid:
+                    continue
+
+                # create cloud region with composed AAI cloud_region_id
+                # except for the one onboarded externally (e.g. ESR)
+                gen_cloud_region_id = cloud_region_id + "_" + regionid
+                self._logger.info("create a cloud region: %s,%s,%s"
+                                  % (cloud_owner, gen_cloud_region_id, regionid))
+
+                self._update_cloud_region(
+                    cloud_owner, gen_cloud_region_id, regionid, viminfo)
+                new_vimid = extsys.encode_vim_id(
+                    cloud_owner, gen_cloud_region_id)
+                # super(APIv1Registry, self).post(request, new_vimid)
+                super(RegistryHelper, self)(new_vimid)
+
+        # update the specified region
+        self._update_cloud_region(cloud_owner, cloud_region_id,
+                                  region_specified, viminfo)
+
+        self.super(RegistryHelper, self).registry(vimid)
+
+        return 0
+
+
+    def unregistry(self, vimid=""):
+        '''extend base method'''
+
+        return self.super(RegistryHelper, self).unregistry(vimid)
+
     def _get_ovsdpdk_capabilities(self, extra_specs, viminfo):
+        '''extend base method'''
+
         instruction_capability = {}
         feature_uuid = uuid.uuid4()
 
@@ -174,11 +284,12 @@ class APIv1Registry(newton_registration.Registry):
             return retcode
         return 1  # unknown cloud owner,region_id
 
-    def _discover_regions(self, cloud_owner="", cloud_region_id="",
+    # def _discover_regions(self, cloud_owner="", cloud_region_id="",
+    def _discover_regions(self, vimid="",
                           session=None, viminfo=None):
         try:
             regions = []
-            vimid = extsys.encode_vim_id(cloud_owner, cloud_region_id)
+            # vimid = extsys.encode_vim_id(cloud_owner, cloud_region_id)
             isDistributedCloud = False
             openstackregions = self._get_list_resources(
                 "/regions", "identity", session, viminfo, vimid,
@@ -209,113 +320,3 @@ class APIv1Registry(newton_registration.Registry):
         except Exception:
             self._logger.error(traceback.format_exc())
             return []
-
-    def post(self, request, cloud_owner="", cloud_region_id=""):
-        self._logger.info("registration with : %s, %s"
-                          % (cloud_owner, cloud_region_id))
-
-        try:
-            vimid = extsys.encode_vim_id(cloud_owner, cloud_region_id)
-
-            viminfo = VimDriverUtils.get_vim_info(vimid)
-            cloud_extra_info_str = viminfo['cloud_extra_info']
-            cloud_extra_info = None
-            try:
-                cloud_extra_info = json.loads(cloud_extra_info_str)\
-                    if cloud_extra_info_str else None
-            except Exception as ex:
-                logger.error("Can not convert cloud extra info %s %s" % (
-                    str(ex), cloud_extra_info_str))
-                pass
-
-            region_specified = cloud_extra_info.get(
-                "openstack-region-id", None) if cloud_extra_info else None
-            multi_region_discovery = cloud_extra_info.get(
-                "multi-region-discovery", None) if cloud_extra_info else None
-
-            # set the default tenant since there is no tenant info in the VIM yet
-            sess = VimDriverUtils.get_session(
-                viminfo, tenant_name=viminfo['tenant'])
-
-            # discover the regions, expect it always returns a list (even empty list)
-            region_ids = self._discover_regions(cloud_owner, cloud_region_id, sess, viminfo)
-
-            if len(region_ids) == 0:
-                self._logger.warn("failed to get region id")
-
-            # compare the regions with region_specified and then cloud_region_id
-            if region_specified in region_ids:
-                pass
-            elif cloud_region_id in region_ids:
-                region_specified = cloud_region_id
-                pass
-            else:
-                # assume the first region be the primary region
-                # since we have no other way to determine it.
-                region_specified = region_ids.pop(0)
-
-            # update cloud region and discover/register resource
-            if multi_region_discovery:
-                # no input for specified cloud region,
-                # so discover all cloud region
-                for regionid in region_ids:
-                    # do not update the specified region here
-                    if region_specified == regionid:
-                        continue
-
-                    # create cloud region with composed AAI cloud_region_id
-                    # except for the one onboarded externally (e.g. ESR)
-                    gen_cloud_region_id = cloud_region_id + "_" + regionid
-                    self._logger.info("create a cloud region: %s,%s,%s"
-                                      % (cloud_owner, gen_cloud_region_id, regionid))
-
-                    self._update_cloud_region(
-                        cloud_owner, gen_cloud_region_id, regionid, viminfo)
-                    new_vimid = extsys.encode_vim_id(
-                        cloud_owner, gen_cloud_region_id)
-                    super(APIv1Registry, self).post(request, new_vimid)
-
-            # update the specified region
-            self._update_cloud_region(cloud_owner, cloud_region_id,
-                                      region_specified, viminfo)
-            return super(APIv1Registry, self).post(request, vimid)
-
-        except HttpError as e:
-            self._logger.error("HttpError: status:%s, response:%s"
-                               % (e.http_status, e.response.json()))
-            return Response(data=e.response.json(), status=e.http_status)
-        except Exception as e:
-            self._logger.error(traceback.format_exc())
-            return Response(
-                data={'error': str(e)},
-                status=status.HTTP_500_INTERNAL_SERVER_ERROR)
-
-    def delete(self, request, cloud_owner="", cloud_region_id=""):
-        self._logger.debug("unregister cloud region: %s, %s"
-                           % (cloud_owner, cloud_region_id))
-
-        vimid = extsys.encode_vim_id(cloud_owner, cloud_region_id)
-        return super(APIv1Registry, self).delete(request, vimid)
-
-
-# APIv0 handler upgrading: leverage APIv1 handler
-class APIv0Registry(APIv1Registry):
-    def __init__(self):
-        super(APIv0Registry, self).__init__()
-        self.proxy_prefix = settings.MULTICLOUD_PREFIX
-        self.aai_base_url = settings.AAI_BASE_URL
-        # self._logger = logger
-
-    def post(self, request, vimid=""):
-        self._logger.info("registration with :  %s" % vimid)
-
-        cloud_owner, cloud_region_id = extsys.decode_vim_id(vimid)
-        return super(APIv0Registry, self).post(
-            request, cloud_owner, cloud_region_id)
-
-    def delete(self, request, vimid=""):
-        self._logger.debug("unregister cloud region: %s" % vimid)
-
-        cloud_owner, cloud_region_id = extsys.decode_vim_id(vimid)
-        return super(APIv0Registry, self).delete(
-            request, cloud_owner, cloud_region_id)