public async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
{
var httpMethod = context.HttpContext.Request.Method;
var routeValues = context.RouteData.Values;
var workflowTypeEntries = await _workflowTypeRouteEntries.GetWorkflowRouteEntriesAsync(httpMethod, routeValues);
var workflowEntries = await _workflowRouteEntries.GetWorkflowRouteEntriesAsync(httpMethod, routeValues);
if (workflowTypeEntries.Any())
{
var workflowTypeIds = workflowTypeEntries.Select(x => Int32.Parse(x.WorkflowId)).ToList();
var workflowTypes = (await _workflowTypeStore.GetAsync(workflowTypeIds)).ToDictionary(x => x.Id);
var correlationId = routeValues.GetValue <string>("correlationid");
foreach (var entry in workflowTypeEntries)
{
if (workflowTypes.TryGetValue(Int32.Parse(entry.WorkflowId), out var workflowType))
{
var activity = workflowType.Activities.Single(x => x.ActivityId == entry.ActivityId);
if (activity.IsStart)
{
// If this is not a singleton workflow or there is not already an halted instance, start a new workflow.
if (!workflowType.IsSingleton || !await _workflowStore.HasHaltedInstanceAsync(workflowType.WorkflowTypeId))
{
await _workflowManager.StartWorkflowAsync(workflowType, activity, null, correlationId);
}
}
}
}
}
if (workflowEntries.Any())
{
var workflowIds = workflowEntries.Select(x => x.WorkflowId).ToList();
var workflows = (await _workflowStore.GetAsync(workflowIds)).ToDictionary(x => x.WorkflowId);
var correlationId = routeValues.GetValue <string>("correlationid");
foreach (var entry in workflowEntries)
{
if (workflows.TryGetValue(entry.WorkflowId, out var workflow) &&
(String.IsNullOrWhiteSpace(correlationId) ||
workflow.CorrelationId == correlationId))
{
var blockingActivity = workflow.BlockingActivities.Single(x => x.ActivityId == entry.ActivityId);
await _workflowManager.ResumeWorkflowAsync(workflow, blockingActivity);
}
}
}
await next();
}
public async Task <IActionResult> Invoke(string token)
{
if (!_securityTokenService.TryDecryptToken <WorkflowPayload>(token, out var payload))
{
_logger.LogWarning("Invalid SAS token provided");
return(NotFound());
}
// Get the workflow type.
var workflowType = await _workflowTypeStore.GetAsync(payload.WorkflowId);
if (workflowType == null)
{
if (_logger.IsEnabled(LogLevel.Warning))
{
_logger.LogWarning("The provided workflow with ID '{WorkflowTypeId}' could not be found.", payload.WorkflowId);
}
return(NotFound());
}
if (!workflowType.IsEnabled)
{
if (_logger.IsEnabled(LogLevel.Warning))
{
_logger.LogWarning("The provided workflow with ID '{WorkflowTypeId}' is not enabled.", payload.WorkflowId);
}
return(NotFound());
}
// Get the activity record using the activity ID provided by the token.
var startActivity = workflowType.Activities.FirstOrDefault(x => x.ActivityId == payload.ActivityId);
if (startActivity == null)
{
if (_logger.IsEnabled(LogLevel.Warning))
{
_logger.LogWarning("The provided activity with ID '{ActivityId}' could not be found.", payload.ActivityId);
}
return(NotFound());
}
// Instantiate and bind an actual HttpRequestEvent object to check its settings.
var httpRequestActivity = _activityLibrary.InstantiateActivity <HttpRequestEvent>(startActivity);
if (httpRequestActivity == null)
{
if (_logger.IsEnabled(LogLevel.Warning))
{
_logger.LogWarning("Activity with name '{ActivityName}' could not be found.", startActivity.Name);
}
return(NotFound());
}
// Check if the HttpRequestEvent is configured to perform antiforgery token validation. If so, perform the validation.
if (httpRequestActivity.ValidateAntiforgeryToken && (!await _antiforgery.IsRequestValidAsync(HttpContext)))
{
_logger.LogWarning("Antiforgery token validation failed.");
return(BadRequest());
}
// If the activity is a start activity, start a new workflow.
if (startActivity.IsStart)
{
// If a singleton, try to acquire a lock per workflow type.
(var locker, var locked) = await _distributedLock.TryAcquireWorkflowTypeLockAsync(workflowType);
if (locked)
{
await using var acquiredLock = locker;
// Check if this is not a workflow singleton or there's not already an halted instance on any activity.
if (!workflowType.IsSingleton || !await _workflowStore.HasHaltedInstanceAsync(workflowType.WorkflowTypeId))
{
if (_logger.IsEnabled(LogLevel.Debug))
{
_logger.LogDebug("Invoking new workflow of type '{WorkflowTypeId}' with start activity '{ActivityId}'", workflowType.WorkflowTypeId, startActivity.ActivityId);
}
await _workflowManager.StartWorkflowAsync(workflowType, startActivity);
}
}
}
else
{
// Otherwise, we need to resume all halted workflows on this activity.
var workflows = await _workflowStore.ListAsync(workflowType.WorkflowTypeId, new[] { startActivity.ActivityId });
if (!workflows.Any())
{
if (_logger.IsEnabled(LogLevel.Warning))
{
_logger.LogWarning("No workflow found that is blocked on activity '{ActivityId}'", startActivity.ActivityId);
}
return(NotFound());
}
foreach (var workflow in workflows)
{
var blockingActivity = workflow.BlockingActivities.FirstOrDefault(x => x.ActivityId == startActivity.ActivityId);
if (blockingActivity != null)
{
if (_logger.IsEnabled(LogLevel.Debug))
{
_logger.LogDebug("Resuming workflow with ID '{WorkflowId}' on activity '{ActivityId}'", workflow.WorkflowId, blockingActivity.ActivityId);
}
// If atomic, try to acquire a lock per workflow instance.
(var locker, var locked) = await _distributedLock.TryAcquireWorkflowLockAsync(workflow);
if (!locked)
{
continue;
}
await using var acquiredLock = locker;
// If atomic, check if the workflow still exists.
var haltedWorkflow = workflow.IsAtomic ? await _workflowStore.GetAsync(workflow.WorkflowId) : workflow;
if (haltedWorkflow == null)
{
continue;
}
// And if it is still halted on this activity.
blockingActivity = haltedWorkflow.BlockingActivities.FirstOrDefault(x => x.ActivityId == startActivity.ActivityId);
if (blockingActivity != null)
{
await _workflowManager.ResumeWorkflowAsync(haltedWorkflow, blockingActivity);
}
}
}
}
return(GetWorkflowActionResult());
}
public async Task <IActionResult> Invoke(string token)
{
if (!_securityTokenService.TryDecryptToken <WorkflowPayload>(token, out var payload))
{
_logger.LogWarning("Invalid SAS token provided");
return(NotFound());
}
// Get the workflow type.
var workflowType = await _workflowTypeStore.GetAsync(payload.WorkflowId);
if (workflowType == null)
{
_logger.LogWarning("The provided workflow type with ID '{WorkflowTypeId}' could not be found.", payload.WorkflowId);
return(NotFound());
}
// Get the activity record using the activity ID provided by the token.
var startActivity = workflowType.Activities.FirstOrDefault(x => x.ActivityId == payload.ActivityId);
if (startActivity == null)
{
_logger.LogWarning("The provided activity with ID '{ActivityId}' could not be found.", payload.ActivityId);
return(NotFound());
}
// Instantiate and bind an actual HttpRequestEvent object to check its settings.
var httpRequestActivity = _activityLibrary.InstantiateActivity <HttpRequestEvent>(startActivity);
if (httpRequestActivity == null)
{
_logger.LogWarning("Activity with name '{ActivityName}' could not be found.", startActivity.Name);
return(NotFound());
}
// Check if the HttpRequestEvent is configured to perform antiforgery token validation. If so, perform the validation.
if (httpRequestActivity.ValidateAntiforgeryToken && (!await _antiforgery.IsRequestValidAsync(HttpContext)))
{
_logger.LogWarning("Antiforgery token validation failed.");
return(BadRequest());
}
// If the activity is a start activity, start a new workflow.
if (startActivity.IsStart)
{
_logger.LogDebug("Invoking new workflow of type {WorkflowTypeId} with start activity {ActivityId}", workflowType.WorkflowTypeId, startActivity.ActivityId);
await _workflowManager.StartWorkflowAsync(workflowType, startActivity);
}
else
{
// Otherwise, we need to resume a halted workflow.
var workflow = (await _workflowStore.ListAsync(workflowType.WorkflowTypeId, new[] { startActivity.ActivityId })).FirstOrDefault();
if (workflow == null)
{
_logger.LogWarning("No workflow found that is blocked on activity {ActivityId}", startActivity.ActivityId);
return(NotFound());
}
var blockingActivity = workflow.BlockingActivities.FirstOrDefault(x => x.ActivityId == startActivity.ActivityId);
if (blockingActivity != null)
{
_logger.LogDebug("Resuming workflow with ID {WorkflowId} on activity {ActivityId}", workflow.WorkflowId, blockingActivity.ActivityId);
await _workflowManager.ResumeWorkflowAsync(workflow, blockingActivity);
}
}
return(GetWorkflowActionResult());
}
public async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
{
var httpMethod = context.HttpContext.Request.Method;
var routeValues = context.RouteData.Values;
var workflowTypeEntries = await _workflowTypeRouteEntries.GetWorkflowRouteEntriesAsync(httpMethod, routeValues);
var workflowEntries = await _workflowRouteEntries.GetWorkflowRouteEntriesAsync(httpMethod, routeValues);
if (workflowTypeEntries.Any())
{
var workflowTypeIds = workflowTypeEntries.Select(x => Int32.Parse(x.WorkflowId)).ToList();
var workflowTypes = (await _workflowTypeStore.GetAsync(workflowTypeIds)).ToDictionary(x => x.Id);
var correlationId = routeValues.GetValue <string>("correlationid");
foreach (var entry in workflowTypeEntries)
{
if (workflowTypes.TryGetValue(Int32.Parse(entry.WorkflowId), out var workflowType))
{
var activity = workflowType.Activities.Single(x => x.ActivityId == entry.ActivityId);
if (activity.IsStart)
{
// If a singleton, try to acquire a lock per workflow type.
(var locker, var locked) = await _distributedLock.TryAcquireWorkflowTypeLockAsync(workflowType);
if (!locked)
{
continue;
}
await using var acquiredLock = locker;
// Check if this is a workflow singleton and there's already an halted instance on any activity.
if (workflowType.IsSingleton && await _workflowStore.HasHaltedInstanceAsync(workflowType.WorkflowTypeId))
{
continue;
}
await _workflowManager.StartWorkflowAsync(workflowType, activity, null, correlationId);
}
}
}
}
if (workflowEntries.Any())
{
var workflowIds = workflowEntries.Select(x => x.WorkflowId).ToList();
var workflows = (await _workflowStore.GetAsync(workflowIds)).ToDictionary(x => x.WorkflowId);
var correlationId = routeValues.GetValue <string>("correlationid");
foreach (var entry in workflowEntries)
{
if (workflows.TryGetValue(entry.WorkflowId, out var workflow) &&
(String.IsNullOrWhiteSpace(correlationId) ||
workflow.CorrelationId == correlationId))
{
// If atomic, try to acquire a lock per workflow instance.
(var locker, var locked) = await _distributedLock.TryAcquireWorkflowLockAsync(workflow);
if (!locked)
{
continue;
}
await using var acquiredLock = locker;
// If atomic, check if the workflow still exists and is still correlated.
var haltedWorkflow = workflow.IsAtomic ? await _workflowStore.GetAsync(workflow.Id) : workflow;
if (haltedWorkflow == null || (!String.IsNullOrWhiteSpace(correlationId) && haltedWorkflow.CorrelationId != correlationId))
{
continue;
}
// And if it is still halted on this activity.
var blockingActivity = haltedWorkflow.BlockingActivities.SingleOrDefault(x => x.ActivityId == entry.ActivityId);
if (blockingActivity != null)
{
await _workflowManager.ResumeWorkflowAsync(haltedWorkflow, blockingActivity);
}
}
}
}
await next();
}