[CORD-2998] Create sync step to configure fabric switches and ports

Change-Id: I69a9c0ba568a008d998d83b0a4d3118d62fafbbc
diff --git a/xos/synchronizer/steps/sync_fabric_switch.py b/xos/synchronizer/steps/sync_fabric_switch.py
new file mode 100644
index 0000000..b29ec91
--- /dev/null
+++ b/xos/synchronizer/steps/sync_fabric_switch.py
@@ -0,0 +1,84 @@
+
+# Copyright 2017-present Open Networking Foundation
+#
+# 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 requests
+from requests.auth import HTTPBasicAuth
+from synchronizers.new_base.syncstep import SyncStep, DeferredException
+from synchronizers.new_base.modelaccessor import FabricService, Switch
+
+from xosconfig import Config
+from multistructlog import create_logger
+
+log = create_logger(Config().get('logging'))
+
+class SyncFabricSwitch(SyncStep):
+    provides = [Switch]
+    observes = Switch
+
+    def get_fabric_onos_service_internal(self):
+        # There will be a ServiceInstanceLink from the FabricService to the Fabric ONOS App
+        fs = FabricService.objects.first()
+        for link in fs.subscribed_links.all():
+            if link.provider_service_instance:
+                # cast from ServiceInstance to ONOSApp
+                service_instance = link.provider_service_instance.leaf_model
+                # cast from Service to ONOSService
+                return service_instance.owner.leaf_model
+
+        return None
+
+    def get_fabric_onos_service(self):
+        fos = self.get_fabric_onos_service_internal()
+        if not fos:
+            raise Exception("Fabric ONOS service not found")
+        return fos
+
+    def sync_record(self, model):
+        # Send device info to onos-fabric netcfg
+        data = {
+          "devices": {
+            model.ofId: {
+              "basic": {
+                "name": model.name,
+                "driver": model.driver
+              },
+              "segmentrouting" : {
+                "name" : model.name,
+                "ipv4NodeSid" : model.ipv4NodeSid,
+                "ipv4Loopback" : model.ipv4Loopback,
+                "routerMac" : model.routerMac,
+                "isEdgeRouter" : model.isEdgeRouter,
+                "adjacencySids" : []
+              }
+            }
+          }
+        }
+
+        onos = self.get_fabric_onos_service()
+
+        url = 'http://%s:%s/onos/v1/network/configuration/' % (onos.rest_hostname, onos.rest_port)
+        r = requests.post(url, json=data, auth=HTTPBasicAuth(onos.rest_username, onos.rest_password))
+
+        if r.status_code != 200:
+            log.error(r.text)
+            raise Exception("Failed to add device %s into ONOS" % model.name)
+        else:
+            try:
+                print r.json()
+            except Exception:
+                print r.text
+
+    def delete_record(self, switch):
+        pass