Add capacity_check to ocata plugin

Change-Id: I05e1eb32e6435dc22b7b47e5040864194929dd05
Issue-ID: MULTICLOUD-168
Signed-off-by: Yun Huang <yun.huang@windriver.com>

4 files changed, 149 insertions, 0 deletions

diff --git a/ocata/ocata/resource/__init__.py b/ocata/ocata/resource/__init__.py
new file mode 100644
index 00000000..afa702d3
--- /dev/null
+++ b/ocata/ocata/resource/__init__.py
@@ -0,0 +1,14 @@
+# Copyright (c) 2017-2018 Wind River Systems, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
diff --git a/ocata/ocata/resource/views/__init__.py b/ocata/ocata/resource/views/__init__.py
new file mode 100644
index 00000000..afa702d3
--- /dev/null
+++ b/ocata/ocata/resource/views/__init__.py
@@ -0,0 +1,14 @@
+# Copyright (c) 2017-2018 Wind River Systems, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
diff --git a/ocata/ocata/resource/views/capacity.py b/ocata/ocata/resource/views/capacity.py
new file mode 100644
index 00000000..d73cc0fb
--- /dev/null
+++ b/ocata/ocata/resource/views/capacity.py
@@ -0,0 +1,117 @@
+# Copyright (c) 2017-2018 Wind River Systems, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import logging
+import json
+import traceback
+
+from rest_framework import status
+
+from django.conf import settings
+from common.exceptions import VimDriverNewtonException
+from newton_base.util import VimDriverUtils
+
+from keystoneauth1.exceptions import HttpError
+from rest_framework import status
+from rest_framework.response import Response
+from rest_framework.views import APIView
+from common.msapi import extsys
+
+
+logger = logging.getLogger(__name__)
+
+
+class CapacityCheck(APIView):
+
+    def __init__(self):
+        self._logger = logger
+
+    def post(self, request, vimid=""):
+        self._logger.info("CapacityCheck--post::vimid, data> %s, %s" % (vimid, request.data))
+        self._logger.debug("CapacityCheck--post::META> %s" % request.META)
+
+        hasEnoughResource = False
+        try :
+            resource_demand = request.data
+
+            #get token:
+            cloud_owner, regionid = extsys.decode_vim_id(vimid)
+            interface = 'public'
+            service = {'service_type': 'compute',
+                       'interface': interface,
+                       'region_id': regionid}
+
+            tenant_name = None
+            vim = VimDriverUtils.get_vim_info(vimid)
+            sess = VimDriverUtils.get_session(vim, tenant_name)
+
+            #get limit for this tenant
+            req_resouce = "/limits"
+            resp = sess.get(req_resouce, endpoint_filter=service)
+            content = resp.json()
+            compute_limits = content['limits']['absolute']
+
+            #get total resource of this cloud region
+            req_resouce = "/os-hypervisors/statistics"
+            resp = sess.get(req_resouce, endpoint_filter=service)
+            content = resp.json()
+            hypervisor_statistics = content['hypervisor_statistics']
+
+            #get storage limit for this tenant
+            service['service_type'] = 'volumev2'
+            req_resouce = "/limits"
+            resp = sess.get(req_resouce, endpoint_filter=service)
+            content = resp.json()
+            storage_limits = content['limits']['absolute']
+
+            # compute actual available resource for this tenant
+            remainVCPU = compute_limits['maxTotalCores'] - compute_limits['totalCoresUsed']
+
+            if (compute_limits['maxTotalCores'] > hypervisor_statistics['vcpus']):
+                if hypervisor_statistics['vcpus'] > compute_limits['totalCoresUsed']:
+                    remainVCPU = hypervisor_statistics['vcpus'] - compute_limits['totalCoresUsed']
+                else:
+                    remainVCPU = 0
+
+            remainMEM = compute_limits['maxTotalRAMSize'] - compute_limits['totalRAMUsed']
+            if hypervisor_statistics['free_ram_mb'] > remainMEM:
+                remainMEM = hypervisor_statistics['free_ram_mb']
+
+            remainStorage = storage_limits['maxTotalVolumeGigabytes'] - storage_limits['totalGigabytesUsed']
+            if (remainStorage < hypervisor_statistics['free_disk_gb']):
+                remainStorage = hypervisor_statistics['free_disk_gb']
+
+            # compare resource demanded with available
+            if (int(resource_demand['vCPU']) >= remainVCPU):
+                hasEnoughResource = False
+            elif (int(resource_demand['Memory']) >= remainMEM):
+                hasEnoughResource = False
+            elif (int(resource_demand['Storage']) >= remainStorage):
+                hasEnoughResource = False
+            else:
+                hasEnoughResource = True
+
+            return Response(data={'result': hasEnoughResource}, status=status.HTTP_200_OK)
+        except VimDriverNewtonException as e:
+            return Response(data={'result': hasEnoughResource,'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()))
+            resp = e.response.json()
+            resp.update({'result': hasEnoughResource})
+            return Response(data=e.response.json(), status=e.http_status)
+        except Exception as e:
+            self._logger.error(traceback.format_exc())
+            return Response(data={'result': hasEnoughResource, 'error': str(e)},
+                            status=status.HTTP_500_INTERNAL_SERVER_ERROR)
+
diff --git a/ocata/ocata/urls.py b/ocata/ocata/urls.py
index b1d198d7..b6312cfb 100644
--- a/ocata/ocata/urls.py
+++ b/ocata/ocata/urls.py
@@ -16,6 +16,7 @@ from django.conf.urls import include, url
 
 from ocata.registration.views import registration
 from newton_base.openoapi import tenants
+from ocata.resource.views import capacity
 
 urlpatterns = [
     url(r'^', include('ocata.swagger.urls')),
@@ -32,6 +33,9 @@ urlpatterns = [
              tenants.Tenants.as_view()),
     url(r'^api/multicloud-ocata/v0/(?P<vimid>[0-9a-zA-Z_-]+)/'
         '(?P<tenantid>[0-9a-zA-Z_-]{20,})/', include('ocata.requests.urls')),
+    # CapacityCheck
+    url(r'^api/multicloud-ocata/v0/(?P<vimid>[0-9a-zA-Z_-]+)/capacity_check/?$',
+        capacity.CapacityCheck.as_view()),
 ]