private void Load_ModbusAssembly()
{
try
{
// Wrap class reference in lambda function to force
// assembly load errors to occur within the try-catch
new Action(() =>
{
// Make embedded resources of Modbus poller available to web server
using (ModbusPoller poller = new ModbusPoller())
WebExtensions.AddEmbeddedResourceAssembly(poller.GetType().Assembly);
ModbusPoller.RestoreConfigurations(FilePath.GetAbsolutePath("ModbusConfigs"));
})();
}
catch (Exception ex)
{
Program.Host.LogException(new InvalidOperationException($"Failed to load Modbus assembly: {ex.Message}", ex));
}
}
public void Configuration(IAppBuilder app)
{
// Modify the JSON serializer to serialize dates as UTC - otherwise, timezone will not be appended
// to date strings and browsers will select whatever timezone suits them
JsonSerializerSettings settings = JsonUtility.CreateDefaultSerializerSettings();
settings.DateTimeZoneHandling = DateTimeZoneHandling.Utc;
JsonSerializer serializer = JsonSerializer.Create(settings);
GlobalHost.DependencyResolver.Register(typeof(JsonSerializer), () => serializer);
AppModel model = Program.Host.Model;
// Load security hub into application domain before establishing SignalR hub configuration, initializing default status and exception handlers
try
{
using (new SecurityHub(
(message, updateType) => Program.Host.LogWebHostStatusMessage(message, updateType),
ex => Program.Host.LogException(ex)
)) { }
}
catch (Exception ex)
{
Program.Host.LogException(new SecurityException($"Failed to load Security Hub, validate database connection string in configuration file: {ex.Message}", ex));
}
// Load shared hub into application domain, initializing default status and exception handlers
try
{
using (new SharedHub(
(message, updateType) => Program.Host.LogWebHostStatusMessage(message, updateType),
ex => Program.Host.LogException(ex)
)) { }
}
catch (Exception ex)
{
Program.Host.LogException(new SecurityException($"Failed to load Shared Hub: {ex.Message}", ex));
}
// Load Modbus assembly
try
{
// Make embedded resources of Modbus poller available to web server
using (ModbusPoller poller = new ModbusPoller())
WebExtensions.AddEmbeddedResourceAssembly(poller.GetType().Assembly);
ModbusPoller.RestoreConfigurations(FilePath.GetAbsolutePath("ModbusConfigs"));
}
catch (Exception ex)
{
Program.Host.LogException(new InvalidOperationException($"Failed to load Modbus assembly: {ex.Message}", ex));
}
// Configure Windows Authentication for self-hosted web service
HubConfiguration hubConfig = new HubConfiguration();
HttpConfiguration httpConfig = new HttpConfiguration();
// Setup resolver for web page controller instances
httpConfig.DependencyResolver = WebPageController.GetDependencyResolver(WebServer.Default, Program.Host.DefaultWebPage, model, typeof(AppModel));
// Make sure any hosted exceptions get propagated to service error handling
httpConfig.Services.Replace(typeof(IExceptionHandler), new HostedExceptionHandler());
// Enabled detailed client errors
hubConfig.EnableDetailedErrors = true;
// Enable GSF session management
httpConfig.EnableSessions(AuthenticationOptions);
// Enable GSF role-based security authentication
app.UseAuthentication(AuthenticationOptions);
// Enable cross-domain scripting default policy - controllers can manually
// apply "EnableCors" attribute to class or an action to override default
// policy configured here
try
{
if (!string.IsNullOrWhiteSpace(model.Global.DefaultCorsOrigins))
{
httpConfig.EnableCors(new EnableCorsAttribute(model.Global.DefaultCorsOrigins, model.Global.DefaultCorsHeaders, model.Global.DefaultCorsMethods)
{
SupportsCredentials = model.Global.DefaultCorsSupportsCredentials
});
}
}
catch (Exception ex)
{
Program.Host.LogException(new InvalidOperationException($"Failed to establish default CORS policy: {ex.Message}", ex));
}
// Load ServiceHub SignalR class
app.MapSignalR(hubConfig);
// Map custom API controllers
try
{
using (new GrafanaController()) { }
httpConfig.Routes.MapHttpRoute(
name: "CustomAPIs",
routeTemplate: "api/{controller}/{action}/{id}",
defaults: new { action = "Index", id = RouteParameter.Optional }
);
}
catch (Exception ex)
{
Program.Host.LogException(new InvalidOperationException($"Failed to initialize custom API controllers: {ex.Message}", ex));
}
// Set configuration to use reflection to setup routes
httpConfig.MapHttpAttributeRoutes();
// Load the WebPageController class and assign its routes
app.UseWebApi(httpConfig);
// Check for configuration issues before first request
httpConfig.EnsureInitialized();
}