Adds collection of vim status metric

[osm/MON.git] / osm_mon / core / database.py

diff --git a/osm_mon/core/database.py b/osm_mon/core/database.py
index a41c0fd..4cbd75f 100644 (file)
--- a/osm_mon/core/database.py
+++ b/osm_mon/core/database.py
@@ -25,16 +25,14 @@
 import logging
 import uuid
 
-from peewee import CharField, TextField, FloatField, Model, AutoField
+from peewee import CharField, TextField, FloatField, Model, AutoField, Proxy
 from playhouse.db_url import connect
 
 from osm_mon.core.settings import Config
 
 log = logging.getLogger(__name__)
-cfg = Config.instance()
-cfg.read_environ()
 
-db = connect(cfg.DATABASE)
+db = Proxy()
 
 
 class BaseModel(Model):
@@ -69,54 +67,60 @@ class Alarm(BaseModel):
 
 
 class DatabaseManager:
+    def __init__(self):
+        cfg = Config.instance()
+        cfg.read_environ()
+        db.initialize(connect(cfg.DATABASE))
+
     def create_tables(self) -> None:
-        try:
-            db.connect()
+        with db.atomic():
             db.create_tables([VimCredentials, Alarm])
-            db.close()
-        except Exception:
-            log.exception("Error creating tables: ")
 
-    def get_credentials(self, vim_uuid) -> VimCredentials:
-        return VimCredentials.get_or_none(VimCredentials.uuid == vim_uuid)
+    def get_credentials(self, vim_uuid: str = None) -> VimCredentials:
+        with db.atomic():
+            return VimCredentials.get_or_none(VimCredentials.uuid == vim_uuid)
 
     def save_credentials(self, vim_credentials) -> VimCredentials:
         """Saves vim credentials. If a record with same uuid exists, overwrite it."""
-        exists = VimCredentials.get_or_none(VimCredentials.uuid == vim_credentials.uuid)
-        if exists:
-            vim_credentials.id = exists.id
-        vim_credentials.save()
-        return vim_credentials
+        with db.atomic():
+            exists = VimCredentials.get_or_none(VimCredentials.uuid == vim_credentials.uuid)
+            if exists:
+                vim_credentials.id = exists.id
+            vim_credentials.save()
+            return vim_credentials
 
     def get_alarm(self, alarm_id) -> Alarm:
-        alarm = (Alarm.select()
-                 .where(Alarm.alarm_id == alarm_id)
-                 .get())
-        return alarm
+        with db.atomic():
+            alarm = (Alarm.select()
+                     .where(Alarm.alarm_id == alarm_id)
+                     .get())
+            return alarm
 
     def save_alarm(self, name, threshold, operation, severity, statistic, metric_name, vdur_name,
                    vnf_member_index, nsr_id) -> Alarm:
         """Saves alarm."""
         # TODO: Add uuid optional param and check if exists to handle updates (see self.save_credentials)
-        alarm = Alarm()
-        alarm.uuid = str(uuid.uuid4())
-        alarm.name = name
-        alarm.threshold = threshold
-        alarm.operation = operation
-        alarm.severity = severity
-        alarm.statistic = statistic
-        alarm.monitoring_param = metric_name
-        alarm.vdur_name = vdur_name
-        alarm.vnf_member_index = vnf_member_index
-        alarm.nsr_id = nsr_id
-        alarm.save()
-        return alarm
+        with db.atomic():
+            alarm = Alarm()
+            alarm.uuid = str(uuid.uuid4())
+            alarm.name = name
+            alarm.threshold = threshold
+            alarm.operation = operation
+            alarm.severity = severity
+            alarm.statistic = statistic
+            alarm.monitoring_param = metric_name
+            alarm.vdur_name = vdur_name
+            alarm.vnf_member_index = vnf_member_index
+            alarm.nsr_id = nsr_id
+            alarm.save()
+            return alarm
 
     def delete_alarm(self, alarm_uuid) -> None:
-        alarm = (Alarm.select()
-                 .where(Alarm.uuid == alarm_uuid)
-                 .get())
-        alarm.delete_instance()
+        with db.atomic():
+            alarm = (Alarm.select()
+                     .where(Alarm.uuid == alarm_uuid)
+                     .get())
+            alarm.delete_instance()
 
     def get_vim_type(self, vim_account_id) -> str:
         """Get the vim type that is required by the message."""