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Delivery Log Error Handler

The error handler implements IEventPublishErrorHandler and serves the pipeline's error path rather than the middleware path.

When It Acts​

The error handler only acts when:

  • context.Stage == EventPublishStage.ChannelPublish
  • context.Event is non-null

What It Does​

  1. Writes a record with Outcome = Failed
  2. Captures exception type name and message as ErrorCode and ErrorMessage
  3. Sets ElapsedTime = TimeSpan.Zero (exact start time not available in error context)

Registration​

Use the error handler when ThrowOnErrors = false and you still want failures recorded:

builder.Services
    .AddEventPublisher(options =>
    {
        options.ThrowOnErrors = false;  // Don't throw, but still record failures
    })
    .AddDeliveryLog(log => log
        .UseInMemory()
        .UseErrorHandler());  // Captures failures on error path

Using Both Middleware and Error Handler​

Use both when you want every attempt captured:

  • Middleware covers the attempt itself (success or failure)
  • Error handler covers the error pipeline processing
builder.Services
    .AddEventPublisher()
    .AddDeliveryLog(log => log
        .UseInMemory()
        .UseErrorHandler());