Added a check for the DB and a delay at start up if the database is not available (#148)

gaseous-server/Program.cs

@@ -12,8 +12,24 @@ using Microsoft.OpenApi.Models;
 Logging.WriteToDiskOnly = true;
 Logging.Log(Logging.LogType.Information, "Startup", "Starting Gaseous Server " + Assembly.GetExecutingAssembly().GetName().Version);
 
-// set up db
 Database db = new gaseous_tools.Database(Database.databaseType.MySql, Config.DatabaseConfiguration.ConnectionString);
+
+// check db availability
+bool dbOnline = false;
+do
+{
+    Logging.Log(Logging.LogType.Information, "Startup", "Waiting for database...");
+    if (db.TestConnection() == true)
+    {
+        dbOnline = true;
+    }
+    else
+    {
+        Thread.Sleep(30000);
+    }
+} while (dbOnline == true);
+
+// set up db
 db.InitDB();
 
 // load app settings

gaseous-tools/Database.cs

@@ -206,6 +206,18 @@ namespace gaseous_tools
 			}
 		}
 
+		public bool TestConnection()
+		{
+			switch (_ConnectorType)
+            {
+                case databaseType.MySql:
+                    MySQLServerConnector conn = new MySQLServerConnector(_ConnectionString);
+                    return conn.TestConnection();
+                default:
+                    return false;
+            }
+		}
+
         public class SQLTransactionItem
         {
 			public SQLTransactionItem()
@@ -314,6 +326,20 @@ namespace gaseous_tools
                 return cmd;
             }
 
+			public bool TestConnection()
+			{
+				MySqlConnection conn = new MySqlConnection(DBConn);
+				try
+				{
+					conn.Open();
+					conn.Close();
+					return true;
+				}
+				catch
+				{
+					return false;
+				}
+			}
         }
     }
 }