bug [membership-service] Retry db connection and end program if succe…

…ssful

When using ArgoCD for deployment, "wait:true" to wait for the database
in the skaffold.yaml, is not applied, instead all services are created
in parallel. The membership-service tries to connect once to the not yet ready db,
and then waits, doing nothing. To mitigate this the option EnableRetryOnFailure
was added. Now the service tries in a timespan of 60 seconds to connect ten times,
and if it still fails exists the program, causing a recreation of the pod.

src/membership-service/Program.cs

@@ -49,6 +49,8 @@ private static void CreateDbIfNotExists(IHost host)
                 {
                     var logger = services.GetRequiredService<ILogger<Program>>();
                     logger.LogError(ex, "An error occurred creating the DB.");
+                    // Restart the pod until success
+                    System.Environment.Exit(1);
                 }
             }
         }

src/membership-service/Startup.cs

@@ -49,8 +49,12 @@ public void ConfigureServices(IServiceCollection services)
             string connectString = $"Server={dbHost};Port=3306;Database=memberships;user=root;password={dbPwd}";
             services.AddDbContext<MariaDbContext>(
                 options => options.UseMySql(
-                connectString,
-                    new MySqlServerVersion(new Version(10, 5, 8))
+                    connectString,
+                    new MySqlServerVersion(new Version(10, 5, 8)),
+                    options => options.EnableRetryOnFailure(
+                        maxRetryCount: 10,
+                        maxRetryDelay: System.TimeSpan.FromSeconds(60),
+                        errorNumbersToAdd: null)
                 )
             );