"""The module provides implementation of Shared Data Layer (SDL) configurability."""
import os
+from enum import Enum
from collections import namedtuple
+class DbBackendType(Enum):
+ """Enumeration class of supported SDL database backend types."""
+ REDIS = 1
+ FAKE_DICT = 2
+
+
class _Configuration():
"""This class implements Shared Data Layer (SDL) configurability."""
Params = namedtuple('Params', ['db_host', 'db_port', 'db_sentinel_port',
- 'db_sentinel_master_name'])
+ 'db_sentinel_master_name', 'db_type'])
- def __init__(self):
- self.params = self._read_configuration()
+ def __init__(self, fake_db_backend):
+ self.params = self._read_configuration(fake_db_backend)
def __str__(self):
return str(
"DB host": self.params.db_host,
"DB port": self.params.db_port,
"DB master sentinel": self.params.db_sentinel_master_name,
- "DB sentinel port": self.params.db_sentinel_port
+ "DB sentinel port": self.params.db_sentinel_port,
+ "DB type": self.params.db_type.name,
}
)
return self.params
@classmethod
- def _read_configuration(cls):
+ def _read_configuration(cls, fake_db_backend):
+ backend_type = DbBackendType.REDIS
+ if fake_db_backend:
+ if fake_db_backend.lower() != 'dict':
+ msg = ("Configuration error: "
+ "SDL instance was initiated with wrong "
+ "'fake_db_backend' argument value: {}. "
+ "Value 'dict' is only supported.".
+ format(fake_db_backend))
+ raise ValueError(msg)
+
+ backend_type = DbBackendType.FAKE_DICT
+
return _Configuration.Params(db_host=os.getenv('DBAAS_SERVICE_HOST'),
db_port=os.getenv('DBAAS_SERVICE_PORT'),
db_sentinel_port=os.getenv('DBAAS_SERVICE_SENTINEL_PORT'),
- db_sentinel_master_name=os.getenv('DBAAS_MASTER_NAME'))
+ db_sentinel_master_name=os.getenv('DBAAS_MASTER_NAME'),
+ db_type=backend_type)