Merge pull request #5860 from elsa-workflows/enh/engine_ex
Add engine exception handling middleware
This commit is contained in:
raymonddenhaan
GitHub
commit
1437635903
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@ -16,18 +16,14 @@ using Microsoft.Extensions.DependencyInjection;
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namespace Elsa.Workflows;
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/// <summary>
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/// A delegate entry that is used by activities to be notified when the activities they scheduled are completed.
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/// </summary>
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/// <param name="Owner">The activity scheduling the <see cref="Child"/> activity.</param>
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/// <param name="Child">The child <see cref="IActivity"/> being scheduled.</param>
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/// <param name="CompletionCallback">The <see cref="ActivityCompletionCallback"/> delegate to invoke when the scheduled <see cref="Child"/> activity completes.</param>
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/// <param name="Tag">An optional tag.</param>
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public record ActivityCompletionCallbackEntry(ActivityExecutionContext Owner, ActivityNode Child, ActivityCompletionCallback? CompletionCallback, object? Tag = default);
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/// <summary>
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/// Provides context to the currently executing workflow.
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/// </summary>
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[PublicAPI]
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public partial class WorkflowExecutionContext : IExecutionContext
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{
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@ -40,9 +36,7 @@ public partial class WorkflowExecutionContext : IExecutionContext
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private readonly IHasher _hasher;
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private readonly Action<WorkflowExecutionContext>? _statusUpdatedCallback;
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/// <summary>
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/// Initializes a new instance of <see cref="WorkflowExecutionContext"/>.
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/// </summary>
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private WorkflowExecutionContext(
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IServiceProvider serviceProvider,
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WorkflowGraph workflowGraph,
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@ -87,9 +81,7 @@ public partial class WorkflowExecutionContext : IExecutionContext
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_cancellationRegistrations.Add(sysSource.Token.Register(CancelWorkflow));
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}
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/// <summary>
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/// Creates a new <see cref="WorkflowExecutionContext"/> for the specified workflow.
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/// </summary>
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public static async Task<WorkflowExecutionContext> CreateAsync(
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IServiceProvider serviceProvider,
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WorkflowGraph workflowGraph,
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@ -122,9 +114,7 @@ public partial class WorkflowExecutionContext : IExecutionContext
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);
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}
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/// <summary>
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/// Creates a new <see cref="WorkflowExecutionContext"/> for the specified workflow.
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/// </summary>
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public static async Task<WorkflowExecutionContext> CreateAsync(
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IServiceProvider serviceProvider,
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WorkflowGraph workflowGraph,
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@ -159,9 +149,7 @@ public partial class WorkflowExecutionContext : IExecutionContext
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return workflowExecutionContext;
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}
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/// <summary>
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/// Creates a new <see cref="WorkflowExecutionContext"/> for the specified workflow.
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/// </summary>
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public static async Task<WorkflowExecutionContext> CreateAsync(
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IServiceProvider serviceProvider,
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WorkflowGraph workflowGraph,
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@ -202,9 +190,7 @@ public partial class WorkflowExecutionContext : IExecutionContext
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return workflowExecutionContext;
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}
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/// <summary>
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/// Assigns the specified workflow to this workflow execution context.
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/// </summary>
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/// <param name="workflowGraph">The workflow graph to assign.</param>
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public async Task SetWorkflowGraphAsync(WorkflowGraph workflowGraph)
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{
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@ -220,247 +206,157 @@ public partial class WorkflowExecutionContext : IExecutionContext
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activityExecutionContext.Activity = workflowGraph.NodeIdLookup[activityExecutionContext.Activity.NodeId].Activity;
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}
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/// <summary>
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/// Gets the <see cref="IServiceProvider"/>.
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/// </summary>
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public IServiceProvider ServiceProvider { get; }
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/// <summary>
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/// Gets the <see cref="IActivityRegistry"/>.
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/// </summary>
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public IActivityRegistry ActivityRegistry { get; }
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/// <summary>
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/// Gets the <see cref="IActivityRegistryLookupService"/>.
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/// </summary>
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public IActivityRegistryLookupService ActivityRegistryLookup { get; }
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/// <summary>
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/// Gets the workflow graph.
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/// </summary>
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public WorkflowGraph WorkflowGraph { get; private set; }
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/// <summary>
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/// The <see cref="Workflow"/> associated with the execution context.
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/// </summary>
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public Workflow Workflow => WorkflowGraph.Workflow;
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/// <summary>
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/// A graph of the workflow structure.
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/// </summary>
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public ActivityNode Graph => WorkflowGraph.Root;
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/// <summary>
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/// The current status of the workflow.
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/// </summary>
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public WorkflowStatus Status => GetMainStatus(SubStatus);
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/// <summary>
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/// The current sub status of the workflow.
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/// </summary>
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public WorkflowSubStatus SubStatus { get; internal set; }
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/// <summary>
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/// The root <see cref="MemoryRegister"/> associated with the execution context.
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/// </summary>
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public MemoryRegister MemoryRegister { get; private set; } = default!;
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/// <summary>
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/// A unique ID of the execution context.
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/// </summary>
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public string Id { get; set; }
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/// <inheritdoc />
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public IActivity Activity => Workflow;
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/// <summary>
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/// An application-specific identifier associated with the execution context.
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/// </summary>
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public string? CorrelationId { get; set; }
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/// <summary>
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/// The ID of the workflow instance that triggered this instance.
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/// </summary>
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public string? ParentWorkflowInstanceId { get; set; }
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/// <summary>
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/// The date and time the workflow execution context was created.
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/// </summary>
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public DateTimeOffset CreatedAt { get; set; }
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/// <summary>
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/// The date and time the workflow execution context was last updated.
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/// </summary>
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public DateTimeOffset UpdatedAt { get; set; }
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/// <summary>
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/// The date and time the workflow execution context has finished.
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/// </summary>
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public DateTimeOffset? FinishedAt { get; set; }
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/// <summary>
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/// Gets the clock used to determine the current time.
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/// </summary>
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public ISystemClock SystemClock { get; }
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/// <summary>
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/// A flattened list of <see cref="ActivityNode"/>s from the <see cref="Graph"/>.
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/// </summary>
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public IReadOnlyCollection<ActivityNode> Nodes => WorkflowGraph.Nodes.ToList();
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/// <summary>
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/// A map between activity IDs and <see cref="ActivityNode"/>s in the workflow graph.
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/// </summary>
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public IDictionary<string, ActivityNode> NodeIdLookup => WorkflowGraph.NodeIdLookup;
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/// <summary>
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/// A map between hashed activity node IDs and <see cref="ActivityNode"/>s in the workflow graph.
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/// </summary>
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public IDictionary<string, ActivityNode> NodeHashLookup => WorkflowGraph.NodeHashLookup;
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/// <summary>
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/// A map between <see cref="IActivity"/>s and <see cref="ActivityNode"/>s in the workflow graph.
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/// </summary>
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public IDictionary<IActivity, ActivityNode> NodeActivityLookup => WorkflowGraph.NodeActivityLookup;
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/// <summary>
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/// The <see cref="IActivityScheduler"/> for the execution context.
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/// </summary>
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public IActivityScheduler Scheduler { get; }
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/// <summary>
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/// Gets the <see cref="IIdentityGenerator"/>.
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/// </summary>
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public IIdentityGenerator IdentityGenerator { get; }
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/// <summary>
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/// A collection of collected bookmarks during workflow execution.
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/// </summary>
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public ICollection<Bookmark> Bookmarks { get; set; } = new List<Bookmark>();
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/// <summary>
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/// A dictionary of inputs provided at the start of the current workflow execution.
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/// </summary>
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public IDictionary<string, object> Input { get; set; }
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/// <summary>
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/// A dictionary of outputs provided by the current workflow execution.
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/// </summary>
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public IDictionary<string, object> Output { get; set; } = new Dictionary<string, object>();
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/// <inheritdoc />
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public IDictionary<string, object> Properties { get; set; }
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/// <summary>
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/// A dictionary that can be used by application code and middleware to store information and even services. Values do not need to be serializable.
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/// All data will be gone once workflow execution completes.
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/// </summary>
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public IDictionary<object, object> TransientProperties { get; set; } = new Dictionary<object, object>();
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/// <summary>
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/// A collection of incidents that may have occurred during execution.
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/// </summary>
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public ICollection<ActivityIncident> Incidents { get; set; }
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/// <summary>
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/// The current <see cref="ExecuteActivityDelegate"/> delegate to invoke when executing the next activity.
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/// </summary>
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public ExecuteActivityDelegate? ExecuteDelegate { get; set; }
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/// <summary>
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/// Provides context about the bookmark that was used to resume workflow execution, if any.
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/// </summary>
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public ResumedBookmarkContext? ResumedBookmarkContext { get; set; }
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/// <summary>
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/// The ID of the activity associated with the trigger that caused this workflow execution, if any.
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/// </summary>
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public string? TriggerActivityId { get; set; }
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/// <summary>
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/// A set of cancellation tokens that can be used to cancel the workflow execution without cancelling system-level operations.
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/// </summary>
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public CancellationTokens CancellationTokens { get; }
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/// <summary>
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/// A list of <see cref="ActivityCompletionCallbackEntry"/> callbacks that are invoked when the associated child activity completes.
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/// </summary>
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public ICollection<ActivityCompletionCallbackEntry> CompletionCallbacks => new ReadOnlyCollection<ActivityCompletionCallbackEntry>(_completionCallbackEntries);
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/// <summary>
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/// A list of <see cref="ActivityExecutionContext"/>s that are currently active.
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/// </summary>
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public IReadOnlyCollection<ActivityExecutionContext> ActivityExecutionContexts
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{
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get => _activityExecutionContexts.ToList();
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internal set => _activityExecutionContexts = value.ToList();
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}
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/// <summary>
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/// The last execution log sequence number. This number is incremented every time a new entry is added to the execution log and is persisted alongside the workflow instance and restored when the workflow is resumed.
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/// </summary>
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public long ExecutionLogSequence { get; set; }
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/// <summary>
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/// A collection of execution log entries. This collection is flushed when the workflow execution context ends.
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/// </summary>
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public ICollection<WorkflowExecutionLogEntry> ExecutionLog { get; } = new List<WorkflowExecutionLogEntry>();
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/// <summary>
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/// The expression execution context for the current workflow execution.
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/// </summary>
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public ExpressionExecutionContext? ExpressionExecutionContext { get; private set; }
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/// <inheritdoc />
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public IEnumerable<Variable> Variables => Workflow.Variables;
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/// <summary>
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/// Resolves the specified service type from the service provider.
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/// </summary>
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public T GetRequiredService<T>() where T : notnull => ServiceProvider.GetRequiredService<T>();
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/// <summary>
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/// Resolves the specified service type from the service provider.
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/// </summary>
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public object GetRequiredService(Type serviceType) => ServiceProvider.GetRequiredService(serviceType);
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/// <summary>
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/// Resolves the specified service type from the service provider, or creates a new instance if the service type was not found in the service container.
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/// </summary>
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public T GetOrCreateService<T>() where T : notnull => ActivatorUtilities.GetServiceOrCreateInstance<T>(ServiceProvider);
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/// <summary>
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/// Resolves the specified service type from the service provider, or creates a new instance if the service type was not found in the service container.
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/// </summary>
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public object GetOrCreateService(Type serviceType) => ActivatorUtilities.GetServiceOrCreateInstance(ServiceProvider, serviceType);
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/// <summary>
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/// Resolves the specified service type from the service provider.
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/// </summary>
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public T? GetService<T>() where T : notnull => ServiceProvider.GetService<T>();
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/// <summary>
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/// Resolves the specified service type from the service provider.
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/// </summary>
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public object? GetService(Type serviceType) => ServiceProvider.GetService(serviceType);
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/// <summary>
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/// Resolves multiple implementations of the specified service type from the service provider.
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/// </summary>
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public IEnumerable<T> GetServices<T>() where T : notnull => ServiceProvider.GetServices<T>();
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/// <summary>
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/// Registers a completion callback for the specified activity.
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/// </summary>
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internal void AddCompletionCallback(ActivityExecutionContext owner, ActivityNode child, ActivityCompletionCallback? completionCallback = default, object? tag = default)
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{
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var entry = new ActivityCompletionCallbackEntry(owner, child, completionCallback, tag);
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_completionCallbackEntries.Add(entry);
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}
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/// <summary>
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/// Unregisters the completion callback for the specified owner and child activity.
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/// </summary>
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internal ActivityCompletionCallbackEntry? PopCompletionCallback(ActivityExecutionContext owner, ActivityNode child)
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{
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var entry = _completionCallbackEntries.FirstOrDefault(x => x.Owner == owner && x.Child == child);
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@ -480,61 +376,41 @@ public partial class WorkflowExecutionContext : IExecutionContext
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_completionCallbackEntries.Remove(entry);
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}
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/// <summary>
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/// Returns the <see cref="ActivityNode"/> with the specified activity ID from the workflow graph.
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/// </summary>
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public ActivityNode? FindNodeById(string nodeId) => NodeIdLookup.TryGetValue(nodeId, out var node) ? node : default;
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/// <summary>
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/// Returns the <see cref="ActivityNode"/> with the specified hash of the activity node ID from the workflow graph.
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/// </summary>
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/// <param name="hash">The hash of the activity node ID.</param>
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/// <returns>The <see cref="ActivityNode"/> with the specified hash of the activity node ID.</returns>
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public ActivityNode? FindNodeByHash(string hash) => NodeHashLookup.TryGetValue(hash, out var node) ? node : default;
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/// <summary>
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/// Returns the <see cref="ActivityNode"/> containing the specified activity from the workflow graph.
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/// </summary>
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public ActivityNode? FindNodeByActivity(IActivity activity)
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{
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return NodeActivityLookup.TryGetValue(activity, out var node) ? node : default;
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}
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/// <summary>
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/// Returns the <see cref="ActivityNode"/> associated with the specified activity ID.
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/// </summary>
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public ActivityNode? FindNodeByActivityId(string activityId) => Nodes.FirstOrDefault(x => x.Activity.Id == activityId);
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/// <summary>
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/// Returns the <see cref="IActivity"/> with the specified ID from the workflow graph.
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/// </summary>
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public IActivity? FindActivityByNodeId(string nodeId) => FindNodeById(nodeId)?.Activity;
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/// <summary>
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/// Returns the <see cref="IActivity"/> with the specified ID from the workflow graph.
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/// </summary>
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public IActivity? FindActivityById(string activityId) => FindNodeById(NodeIdLookup.SingleOrDefault(n => n.Key.EndsWith(activityId)).Value.NodeId)?.Activity;
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/// <summary>
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/// Returns the <see cref="IActivity"/> with the specified hash of the activity node ID from the workflow graph.
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/// </summary>
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/// <param name="hash">The hash of the activity node ID.</param>
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/// <returns>The <see cref="IActivity"/> with the specified hash of the activity node ID.</returns>
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public IActivity? FindActivityByHash(string hash) => FindNodeByHash(hash)?.Activity;
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/// <summary>
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/// Returns a custom property with the specified key from the <see cref="Properties"/> dictionary.
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/// </summary>
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public T? GetProperty<T>(string key) => Properties.TryGetValue(key, out var value) ? value.ConvertTo<T>() : default;
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/// <summary>
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/// Sets a custom property with the specified key on the <see cref="Properties"/> dictionary.
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/// </summary>
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public void SetProperty<T>(string key, T value) => Properties[key] = value!;
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/// <summary>
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/// Updates a custom property with the specified key on the <see cref="Properties"/> dictionary.
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/// </summary>
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public T UpdateProperty<T>(string key, Func<T?, T> updater)
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{
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var value = GetProperty<T?>(key);
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@ -543,16 +419,14 @@ public partial class WorkflowExecutionContext : IExecutionContext
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return value;
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}
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/// <summary>
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/// Returns true if the <see cref="Properties"/> dictionary contains the specified key.
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/// </summary>
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public bool HasProperty(string name) => Properties.ContainsKey(name);
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internal bool CanTransitionTo(WorkflowSubStatus targetSubStatus) => ValidateStatusTransition(targetSubStatus);
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internal bool CanTransitionTo(WorkflowSubStatus targetSubStatus) => ValidateStatusTransition();
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internal void TransitionTo(WorkflowSubStatus subStatus)
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{
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if (!ValidateStatusTransition(SubStatus))
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if (!ValidateStatusTransition())
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throw new Exception($"Cannot transition from {SubStatus} to {subStatus}");
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SubStatus = subStatus;
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@ -561,7 +435,7 @@ public partial class WorkflowExecutionContext : IExecutionContext
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if (Status == WorkflowStatus.Finished)
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FinishedAt = UpdatedAt;
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//For now only trigger on Cancelled, since the other statuses are handling via the host/runner
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//For now only trigger on Cancelled, since the other statuses are handled via the host/runner
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if (SubStatus == WorkflowSubStatus.Cancelled
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&& _statusUpdatedCallback is not null)
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_statusUpdatedCallback(this);
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@ -576,9 +450,7 @@ public partial class WorkflowExecutionContext : IExecutionContext
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}
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}
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/// <summary>
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/// Creates a new <see cref="ActivityExecutionContext"/> for the specified activity.
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/// </summary>
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public async Task<ActivityExecutionContext> CreateActivityExecutionContextAsync(IActivity activity, ActivityInvocationOptions? options = default)
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{
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var activityDescriptor = await ActivityRegistryLookup.FindAsync(activity) ?? throw new ActivityNotFoundException(activity.Type);
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@ -616,35 +488,23 @@ public partial class WorkflowExecutionContext : IExecutionContext
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return activityExecutionContext;
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}
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/// <summary>
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/// Returns a register of recorded activity output.
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/// </summary>
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public ActivityOutputRegister GetActivityOutputRegister() => TransientProperties.GetOrAdd(ActivityOutputRegistryKey, () => new ActivityOutputRegister());
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/// <summary>
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/// Returns the last activity result.
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/// </summary>
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public object? GetLastActivityResult() => TransientProperties.TryGetValue(LastActivityResultKey, out var value) ? value : default;
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/// <summary>
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/// Adds the specified <see cref="ActivityExecutionContext"/> to the workflow execution context.
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/// </summary>
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public void AddActivityExecutionContext(ActivityExecutionContext context) => _activityExecutionContexts.Add(context);
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/// <summary>
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/// Removes the specified <see cref="ActivityExecutionContext"/> from the workflow execution context.
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/// </summary>
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public void RemoveActivityExecutionContext(ActivityExecutionContext context) => _activityExecutionContexts.Remove(context);
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/// <summary>
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/// Removes the specified <see cref="ActivityExecutionContext"/> from the workflow execution context.
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/// </summary>
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/// <param name="predicate">The predicate used to filter the activity execution contexts to remove.</param>
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public void RemoveActivityExecutionContext(Func<ActivityExecutionContext, bool> predicate) => _activityExecutionContexts.RemoveWhere(predicate);
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/// <summary>
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/// Records the output of the specified activity into the current workflow execution context.
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/// </summary>
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/// <param name="activityExecutionContext">The <see cref="ActivityExecutionContext"/> of the activity.</param>
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/// <param name="outputName">The name of the output.</param>
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||||
/// <param name="value">The value of the output.</param>
|
||||
|
|
@ -670,7 +530,8 @@ public partial class WorkflowExecutionContext : IExecutionContext
|
|||
_ => throw new ArgumentOutOfRangeException(nameof(subStatus), subStatus, null)
|
||||
};
|
||||
|
||||
private bool ValidateStatusTransition(WorkflowSubStatus targetSubStatus)
|
||||
// TODO: Check if we should not use the target subStatus here instead.
|
||||
private bool ValidateStatusTransition()
|
||||
{
|
||||
var currentMainStatus = GetMainStatus(SubStatus);
|
||||
return currentMainStatus != WorkflowStatus.Finished;
|
||||
|
|
|
|||
|
|
@ -0,0 +1,41 @@
|
|||
using Elsa.Common.Contracts;
|
||||
using Elsa.Workflows.Contracts;
|
||||
using Elsa.Workflows.Models;
|
||||
using Elsa.Workflows.Pipelines.WorkflowExecution;
|
||||
using Elsa.Workflows.State;
|
||||
using Microsoft.Extensions.Logging;
|
||||
|
||||
namespace Elsa.Workflows.Middleware.Workflows;
|
||||
|
||||
/// Adds extension methods to <see cref="ExceptionHandlingMiddleware"/>.
|
||||
public static class EngineExceptionHandlingMiddlewareExtensions
|
||||
{
|
||||
/// Installs the <see cref="ExceptionHandlingMiddleware"/> component in the activity execution pipeline.
|
||||
public static IWorkflowExecutionPipelineBuilder UseEngineExceptionHandling(this IWorkflowExecutionPipelineBuilder pipelineBuilder) => pipelineBuilder.UseMiddleware<EngineExceptionHandlingMiddleware>();
|
||||
}
|
||||
|
||||
/// Catches any exceptions thrown by downstream components and transitions the workflow into the faulted state.
|
||||
public class EngineExceptionHandlingMiddleware(WorkflowMiddlewareDelegate next, ISystemClock systemClock, ILogger<EngineExceptionHandlingMiddleware> logger) : IWorkflowExecutionMiddleware
|
||||
{
|
||||
/// <inheritdoc />
|
||||
public async ValueTask InvokeAsync(WorkflowExecutionContext context)
|
||||
{
|
||||
try
|
||||
{
|
||||
await next(context);
|
||||
}
|
||||
catch (Exception e)
|
||||
{
|
||||
logger.LogWarning(e, "An exception was caught from a downstream middleware component");
|
||||
var exceptionState = ExceptionState.FromException(e);
|
||||
var now = systemClock.UtcNow;
|
||||
var activity = context.Workflow;
|
||||
var incident = new ActivityIncident(activity.Id, activity.Type, e.Message, exceptionState, now);
|
||||
|
||||
// No state change as the workflow / activities status should be leading.
|
||||
// We will however be adding an incident to make the issue visible.
|
||||
context.Incidents.Add(incident);
|
||||
context.AddExecutionLogEntry("Faulted", e.Message, exceptionState);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -1,2 +1,6 @@
|
|||
<wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
|
||||
<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=constants/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>
|
||||
<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=constants/@EntryIndexedValue">True</s:Boolean>
|
||||
<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=contracts/@EntryIndexedValue">True</s:Boolean>
|
||||
<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=extensions/@EntryIndexedValue">True</s:Boolean>
|
||||
<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=models/@EntryIndexedValue">True</s:Boolean>
|
||||
<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=services/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>
|
||||
|
|
@ -17,6 +17,7 @@ public static class WorkflowExecutionPipelineBuilderExtensions
|
|||
public static IWorkflowExecutionPipelineBuilder UseDefaultPipeline(this IWorkflowExecutionPipelineBuilder pipelineBuilder) =>
|
||||
pipelineBuilder
|
||||
.Reset()
|
||||
.UseEngineExceptionHandling()
|
||||
.UseBackgroundActivities()
|
||||
.UseBookmarkPersistence()
|
||||
.UseActivityExecutionLogPersistence()
|
||||
|
|
|
|||
Loading…
Reference in a new issue