/// <summary>
/// Handles the receipt of a response message coming from a remote platform by resuming the workflow run and handing the
/// messages to the relevant CAST activity implementation.
/// </summary>
/// <param name="request">The original request message.</param>
/// <param name="response">The response message to process.</param>
public async void Process(TRequest request, TResponse response)
{
using (new DeferredChannelMessageContext())
using (CastService.GetCastContext())
{
try
{
var run = EntityRepository.Get <WorkflowRun>(request.RunId, WorkflowRunPreload);
if (run == null)
{
throw new Exception(string.Format("CAST workflow activity could not resume. Workflow run ({0}) not found.", request.RunId));
}
// let the workflow or caching or whatever, catch up before officially responding to RabbitMQ
if (run.RunStepCounter <= request.RunStep)
{
var state = await WaitForRunStep(run.Id, request.RunStep);
if (state < request.RunStep)
{
throw new Exception(string.Format("CAST workflow activity could not resume. Workflow run ({0}) wasn't in step.", request.RunId));
}
}
var castEvent = new CastActivityResponseEvent <TRequest, TResponse>(request, response);
WorkflowRunner.ResumeWorkflowAsync(run, castEvent);
}
catch (Exception err)
{
EventLog.Application.WriteError("Failed to process CAST response. {0}", err);
}
}
}
/// <summary>
/// Performs a simple write to the event log.
/// </summary>
/// <param name="logRequest">The log request.</param>
/// <returns>The response to the request.</returns>
public LogResponse Log(LogRequest logRequest)
{
using (Profiler.Measure("CastActivityService.Log"))
{
var response = new LogResponse();
try
{
if (logRequest == null)
{
throw new ArgumentNullException("logRequest");
}
if (!CastService.GetIsCastConfigured())
{
throw new InvalidOperationException();
}
EventLog.Application.WriteInformation(logRequest.Message);
response.Time = DateTime.UtcNow;
}
catch (Exception e)
{
response.IsError = true;
response.Error = e.Message;
}
return(response);
}
}
/// <summary>
/// Carries out an operation on a <see cref="UserAccount"/> within a tenant identified by the request.
/// </summary>
/// <param name="userRequest">The request.</param>
/// <returns>The response.</returns>
public UserInfoResponse UserOperation(UserOperationRequest userRequest)
{
using (Profiler.Measure("CastActivityService.UserOperation"))
{
var response = new UserInfoResponse
{
Users = new UserList()
};
try
{
if (userRequest == null)
{
throw new ArgumentNullException("userRequest");
}
if (!CastService.GetIsCastConfigured())
{
throw new InvalidOperationException();
}
var name = userRequest.User;
var tenant = userRequest.Tenant;
switch (userRequest.Operation)
{
case Operation.Create:
UserService.Create(name, userRequest.Password, tenant, userRequest.Roles);
break;
case Operation.Delete:
UserService.Delete(name, tenant);
break;
default:
throw new NotSupportedException(userRequest.Operation.ToString());
}
if (userRequest.Operation != Operation.Delete)
{
var u = UserService.GetUser(name, tenant);
if (u != null)
{
response.Users.Add(u);
}
}
}
catch (Exception e)
{
response.IsError = true;
response.Error = e.Message;
}
return(response);
}
}
/// <summary>
/// Handles the receipt of a heartbeat message.
/// </summary>
/// <param name="pi">The platform information received.</param>
private void HandleHeartbeat(RemotePlatformInfo pi)
{
if (!CastService.GetIsCastConfigured() || !CastService.GetIsCastServer())
{
return;
}
using (new DeferredChannelMessageContext())
using (CastService.GetCastContext())
using (CastService.GetCastUser())
{
PlatformService.CreateOrUpdate(pi);
}
}
/// <summary>
/// Carries out an operation on an <see cref="App"/> with respect to the tenant identified by the request.
/// </summary>
/// <param name="appRequest">The request.</param>
/// <returns>The response.</returns>
public ApplicationInfoResponse ApplicationOperation(ApplicationOperationRequest appRequest)
{
using (Profiler.Measure("CastActivityService.ApplicationOperation"))
{
var response = new ApplicationInfoResponse();
try
{
if (appRequest == null)
{
throw new ArgumentNullException("appRequest");
}
if (!CastService.GetIsCastConfigured())
{
throw new InvalidOperationException();
}
var tenant = appRequest.Tenant;
switch (appRequest.Operation)
{
case Contracts.ApplicationOperation.Install:
ApplicationService.Install(tenant, appRequest.Id, appRequest.Version);
break;
case Contracts.ApplicationOperation.Uninstall:
ApplicationService.Uninstall(tenant, appRequest.Id);
break;
default:
throw new NotSupportedException(appRequest.Operation.ToString());
}
var apps = ApplicationService.GetInstalledApps(tenant);
if (apps != null)
{
response.Installed = apps.ToList();
}
}
catch (Exception e)
{
response.IsError = true;
response.Error = e.Message;
}
return(response);
}
}
/// <summary>
/// Starts a timer which will send a heartbeat message every hour.
/// </summary>
private void StartHeartbeat()
{
var castConfiguration = ConfigurationSettings.GetCastConfigurationSection();
if (castConfiguration == null)
{
return;
}
var castSettings = castConfiguration.Cast;
if (castSettings == null)
{
return;
}
if (castSettings.Enabled != true)
{
return;
}
var interval = castConfiguration.Cast.Heartbeat;
if (interval < 0)
{
interval = 60;
}
EventLog.Application.WriteInformation("Sending heartbeat every {0} minutes.", interval);
//CastService.SendHeartbeat();
_timer.Interval = interval * 1000 * 60;
_timer.Elapsed += (s, a) =>
{
try
{
EventLog.Application.WriteInformation("Sending heartbeat.");
CastService.SendHeartbeat();
}
catch (Exception ex)
{
EventLog.Application.WriteError("Unexpected failure starting CAST heartbeat on timer. {0}", ex);
}
};
_timer.Start();
}
/// <summary>
/// Starts CAST communication channels.
/// </summary>
public void Start()
{
if (CastService.GetIsCastConfigured())
{
EventLog.Application.WriteWarning("CAST communications are starting.");
// Server specific
if (CastService.GetIsCastServer())
{
HeartbeatListener.Receive <RemotePlatformInfo>(SpecialStrings.CastHeartbeatKey, HandleHeartbeat, false);
}
SendHeartbeatNowListener.Subscribe <string>(SpecialStrings.CastHeartbeatDemandKey, SendHeartbeatNow);
StartHeartbeat();
ClientListener.Respond <CastRequest, CastResponse>(CastService.GetClientCommunicationKey(), HandleRequest);
}
}
/// <summary>
/// Handles a CAST request received, passing on to the appropriate CAST activities service call.
/// </summary>
/// <param name="request">The request object received.</param>
/// <returns>The response to pass back to the CAST Server.</returns>
private CastResponse HandleRequest(CastRequest request)
{
// direct the appropriate requests to the activity service (TODO: some kind of registration would be nice)
if (request == null)
{
throw new ArgumentNullException("request");
}
if (CastService.GetIsCastConfigured())
{
using (new DeferredChannelMessageContext())
{
// Log
var logRequest = request as LogRequest;
if (logRequest != null)
{
return(CastActivityService.Log(logRequest));
}
// Tenant
var tenantRequest = request as TenantOperationRequest;
if (tenantRequest != null)
{
return(CastActivityService.TenantOperation(tenantRequest));
}
// User
var userRequest = request as UserOperationRequest;
if (userRequest != null)
{
return(CastActivityService.UserOperation(userRequest));
}
// Application
var appRequest = request as ApplicationOperationRequest;
if (appRequest != null)
{
return(CastActivityService.ApplicationOperation(appRequest));
}
}
}
return(default(CastResponse));
}
/// <summary>
/// Sends a heartbeat message immediately.
/// </summary>
/// <param name="request">The request received.</param>
private void SendHeartbeatNow(string request)
{
EventLog.Application.WriteInformation("Sending heartbeat by request ({0})", request);
CastService.SendHeartbeat();
}
/// <summary>
/// Carries out an operation on a <see cref="Tenant"/> on this plaform identified by the request.
/// </summary>
/// <param name="tenantRequest">The request.</param>
/// <returns>The response.</returns>
public TenantInfoResponse TenantOperation(TenantOperationRequest tenantRequest)
{
using (Profiler.Measure("CastActivityService.TenantOperation"))
{
var response = new TenantInfoResponse
{
Tenants = new TenantList()
};
try
{
if (tenantRequest == null)
{
throw new ArgumentNullException("tenantRequest");
}
if (string.IsNullOrEmpty(tenantRequest.Name))
{
throw new ArgumentException("Tenant name may not be empty.");
}
if (!CastService.GetIsCastConfigured())
{
throw new InvalidOperationException();
}
var name = tenantRequest.Name;
switch (tenantRequest.Operation)
{
case Operation.Create:
TenantService.Create(name);
break;
case Operation.Delete:
TenantService.Delete(name);
break;
case Operation.Enable:
TenantService.Enable(name);
break;
case Operation.Disable:
TenantService.Disable(name);
break;
case Operation.Rename:
TenantService.Rename(tenantRequest.Id, tenantRequest.Name);
break;
default:
throw new NotSupportedException(tenantRequest.Operation.ToString());
}
if (tenantRequest.Operation != Operation.Delete)
{
var ti = TenantService.GetTenant(name);
if (ti != null)
{
response.Tenants.Add(ti);
}
}
}
catch (Exception e)
{
response.IsError = true;
response.Error = e.Message;
}
return(response);
}
}
