AwsContext
{
   internal string Foo { get; private set; }
   internal string Bar { get; private set; }
   internal string Etc { get; private set; }

   internal static AwsContext LoadContext() {
     AwsContext context;

     if (bool.TryParse(Environment.GetEnvironmentVariable("use_env_context"), out isEnvContext) && isEnvContext)
     {
        context = AwsContext();
        context.LoadEnvContext();
     }
     else
     {
        context = AwsContext.LoadJsonContext();
     }

     return context;
   }

   internal AwsContext LoadEnvContext()
   {
      Foo = GoGet("Foo");
      Bar = GoGet("Bar");
      Etc = GoGet("Etc");

      LogValues();
   }

   internal static AwsContext LoadJsonContext()
   {
      var context = Json.Deserialize<AwsContext>(File.ReadAllText(Paths.AwsContextFile));
      context.LogValues();
      return context;
   }

}


MainServiceCore
{
   context.AwsContext = AwsContext.LoadContext();
}