database: updated schema

Updated l2sm database schema and operator to go along with it. Now there are more constraints in the database and errors are handled accordingly, so the application is more robust against errors

.vscode/launch.json

+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Kopf Run: l2sm-operator",
+            "type": "node-terminal",
+            "request": "launch",
+            "command": "kopf run ${workspaceFolder}/src/operator/l2sm-operator.py",
+            "env": {
+                "CONTROLLER_IP": "10.152.183.3", 
+                "DATABASE_IP": "10.152.183.132",
+                "MYSQL_USER": "l2sm",
+                "MYSQL_PASSWORD": "l2sm",
+                "MYSQL_DATABASE": "l2sm"
+            }
+        }
+    ]
+}

deployments/custom-installation/mysql/database-schema.yaml

+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: mysql-schema
+data:
+  init.sql: |
+  
+    CREATE DATABASE IF NOT EXISTS l2sm;
+    USE l2sm;
+
+    CREATE TABLE networks (
+      id INT PRIMARY KEY AUTO_INCREMENT,
+      name VARCHAR(255) NOT NULL,
+      type ENUM('vlink', 'vnet', 'ext-vnet') NOT NULL,
+      UNIQUE KEY unique_network_name (name, type)
+    );
+
+    CREATE TABLE switches (
+      id INT PRIMARY KEY AUTO_INCREMENT,
+      node_name VARCHAR(255) NOT NULL,
+      openflowId TEXT,
+      ip VARCHAR(15)
+    );
+
+    CREATE TABLE neds (
+      id INT PRIMARY KEY AUTO_INCREMENT,
+      node_name VARCHAR(255) NOT NULL,
+      provider VARCHAR(255) NOT NULL,
+      openflowId TEXT,
+      ip VARCHAR(15)
+    );
+
+    CREATE TABLE interfaces (
+      id INT PRIMARY KEY AUTO_INCREMENT,
+      name VARCHAR(255),
+      pod VARCHAR(255),
+      switch_id INT,
+      ned_id INT,
+      network_id INT,
+      FOREIGN KEY (switch_id) REFERENCES switches(id),
+      FOREIGN KEY (ned_id) REFERENCES neds(id),
+      FOREIGN KEY (network_id) REFERENCES networks(id)
+    );
+
+    -- Define the one-to-many relationship between switches and interfaces
+    ALTER TABLE interfaces
+    ADD CONSTRAINT fk_switch_interface
+    FOREIGN KEY (switch_id)
+    REFERENCES switches(id);
+
+    -- Define the one-to-many relationship between neds and interfaces
+    ALTER TABLE interfaces
+    ADD CONSTRAINT fk_ned_interface
+    FOREIGN KEY (ned_id)
+    REFERENCES neds(id);
+
+    -- Define the many-to-one relationship between networks and interfaces
+    ALTER TABLE interfaces
+    ADD CONSTRAINT fk_network_interface
+    FOREIGN KEY (network_id)
+    REFERENCES networks(id);

deployments/custom-installation/mysql/mysql-development.yaml

+apiVersion: v1
+kind: Pod
+metadata:
+  name: mysql-development-pod
+  labels:
+    app: mysql
+spec:
+  containers:
+  - name: mysql
+    image: mysql:5.7
+    envFrom:
+    - secretRef:
+        name: mysql-secret
+    ports:
+      - containerPort: 3306
+        name: mysql
+    volumeMounts:
+      - name: mysql-persistent-storage
+        mountPath: /var/lib/mysql
+      - name: initdb-volume
+        mountPath: /docker-entrypoint-initdb.d
+  volumes:
+    - name: mysql-persistent-storage
+      persistentVolumeClaim:
+        claimName: mysql-pv-claim
+    - name: initdb-volume
+      configMap:
+        name: mysql-schema
+        items:
+        - key: init.sql
+          path: init.sql
+  nodeName: l2sm1
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: mysql-development-service
+spec:
+  type: NodePort
+  ports:
+    - port: 3306
+      targetPort: 3306
+      nodePort: 30001
+      protocol: TCP
+  selector:
+    app: mysql
+
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  name: mysql-secret
+type: Opaque
+data:
+  MYSQL_ROOT_PASSWORD: cGFzc3dvcmQ=  # Base64 encoded "password"
+  MYSQL_USER: bDJzbQ==              # Base64 encoded "l2sm"
+  MYSQL_PASSWORD: bDJzbQ==          # Base64 encoded "l2sm"
+  MYSQL_DATABASE: bDJzbQ==