first working version

utils/db/db.py

@@ -0,0 +1,59 @@
+
+import logging
+from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
+from sqlalchemy.pool import NullPool
+
+class DbConnector:
+    _instances = {}
+
+    def __new__(cls, db_id="default"):
+        # print("==================")
+        # [print(f"{i} -> {id(cls._instances[i])}") for i in cls._instances]
+        # print("==================")
+        if db_id not in cls._instances:
+            cls._instances[db_id] = super().__new__(cls)
+        return cls._instances[db_id]
+
+    def __init__(self, db_id:str="default"):
+        self.logger = logging.getLogger("spirent_service_db_connector")
+
+    def init(self, db_type:str, host:str, port:int, db_name:str, user:str, password:str):
+        """
+
+        :param db_type: Example: mysql, postgresql, ...
+        :param host:
+        :param port:
+        :param db_name:
+        :param user:
+        :param password:
+        """
+
+        self.db_type = db_type
+        self.host = host
+        self.port = port
+        self.name = db_name
+        self.user = user
+        self.password = password
+
+        protocol = {
+            'mysql': 'mysql+aiomysql',
+            'postgresql': 'postgresql+asyncpg',
+        }
+
+        sqlalchemy_database_url = f"{protocol[self.db_type]}://{user}:{password}@{host}:{port}/{db_name}"
+        # for security reason, password not print in logs.
+        sqlalchemy_database_url_log = f"mysql://{user}:******@{host}:{port}/{db_name}"
+        self.logger.debug(f"Connecting to db {sqlalchemy_database_url_log}")
+
+        self.engine = create_async_engine(sqlalchemy_database_url, poolclass=NullPool)
+        self.async_session_local = async_sessionmaker(bind=self.engine,
+                                                      expire_on_commit=False,
+                                                      class_=AsyncSession,
+                                                      autoflush=False,
+                                                    )
+
+    def get_db(self):
+        return self.async_session_local
+
+
+

utils/db/db_mtr_network_nodes.py

@@ -0,0 +1,44 @@
+from utils.db.db import DbConnector
+from models.model_mtr_network_nodes import MtrAdditionalNodesModel
+
+from sqlalchemy import select
+
+
+class MtrAdditionalNodeQuery:
+    def __init__(self):
+        db_con = DbConnector("spirent_mysql")
+        self.db = db_con.get_db()
+
+    async def get_all_nodes(self) -> list:
+        """
+        Retrieve all entries from the mtr_network_nodes database table.
+        """
+        async with self.db() as session:
+            result = await session.execute(select(MtrAdditionalNodesModel))
+            all_nodes = result.scalars().all()
+            #await session.close()
+            return all_nodes
+
+    def get_all_nodes_for_testing(self) -> list:
+        """
+        Retrieve all entries from the mtr_network_nodes database table, exclude rows used for storing parameters for
+        testing TAS servers.
+        """
+
+        all_nodes = (self.db.query(MtrAdditionalNodesModel)
+                     .filter(MtrAdditionalNodesModel.test_servers == False)
+                     .filter(MtrAdditionalNodesModel.enabled == True)
+                     .all())
+
+        return all_nodes
+
+    def get_mtr_config_for_servers(self) -> list:
+        all_nodes = (self.db.query(MtrAdditionalNodesModel)
+                     .filter(MtrAdditionalNodesModel.test_servers == True)
+                     .filter(MtrAdditionalNodesModel.enabled == True)
+                     .all())
+
+        return all_nodes
+
+    def get_node_by_id(self, node_id: int) -> MtrAdditionalNodesModel:
+        return self.db.query(MtrAdditionalNodesModel).filter_by(id=node_id).one()