Adds migration engine for peewee ORM

[osm/POL.git] / osm_policy_module / core / database.py

diff --git a/osm_policy_module/core/database.py b/osm_policy_module/core/database.py
index a89baed..3ca2e33 100644 (file)
--- a/osm_policy_module/core/database.py
+++ b/osm_policy_module/core/database.py
@@ -21,43 +21,65 @@
 # For those usages not covered by the Apache License, Version 2.0 please
 # contact: bdiaz@whitestack.com or glavado@whitestack.com
 ##
+import datetime
 import logging
+import os
 
-from peewee import *
-from playhouse.sqlite_ext import SqliteExtDatabase
+from peewee import CharField, IntegerField, ForeignKeyField, Model, TextField, AutoField, DateTimeField, Proxy
+from peewee_migrate import Router
+from playhouse.db_url import connect
 
+from osm_policy_module import migrations
 from osm_policy_module.core.config import Config
 
 log = logging.getLogger(__name__)
-cfg = Config.instance()
 
-db = SqliteExtDatabase('policy_module.db')
+db = Proxy()
 
 
 class BaseModel(Model):
+    id = AutoField(primary_key=True)
+
     class Meta:
         database = db
 
 
-class ScalingRecord(BaseModel):
+class ScalingGroup(BaseModel):
     nsr_id = CharField()
+    vnf_member_index = IntegerField()
     name = CharField()
     content = TextField()
 
 
+class ScalingPolicy(BaseModel):
+    name = CharField()
+    cooldown_time = IntegerField()
+    last_scale = DateTimeField(default=datetime.datetime.now)
+    scaling_group = ForeignKeyField(ScalingGroup, related_name='scaling_policies', on_delete='CASCADE')
+
+
+class ScalingCriteria(BaseModel):
+    name = CharField()
+    scaling_policy = ForeignKeyField(ScalingPolicy, related_name='scaling_criterias', on_delete='CASCADE')
+
+
 class ScalingAlarm(BaseModel):
-    alarm_id = CharField()
+    alarm_uuid = CharField(unique=True)
     action = CharField()
     vnf_member_index = IntegerField()
     vdu_name = CharField()
-    scaling_record = ForeignKeyField(ScalingRecord, related_name='scaling_alarms')
+    scaling_criteria = ForeignKeyField(ScalingCriteria, related_name='scaling_alarms', on_delete='CASCADE')
 
 
 class DatabaseManager:
-    def create_tables(self):
-        try:
-            db.connect()
-            db.create_tables([ScalingRecord, ScalingAlarm])
-            db.close()
-        except Exception as e:
-            log.exception("Error creating tables: ")
+    def __init__(self, config: Config):
+        db.initialize(connect(config.get('sql', 'database_uri')))
+
+    def create_tables(self) -> None:
+        with db.atomic():
+            router = Router(db, os.path.dirname(migrations.__file__))
+            router.run()
+
+    def get_alarm(self, alarm_uuid: str):
+        with db.atomic():
+            return ScalingAlarm.select().where(ScalingAlarm.alarm_uuid == alarm_uuid).get()