PlanTempusApp/PlanTempus.Components/Users/Create/CommandHandlerDecorator.cs

using System.Diagnostics;
using Microsoft.ApplicationInsights;
using Microsoft.ApplicationInsights.DataContracts;
using PlanTempus.Core.CommandQueries;

namespace PlanTempus.Components.Users.Create;

public class CommandHandlerDecorator<TCommand>(
    ICommandHandler<TCommand> decoratedHandler,
    TelemetryClient telemetryClient) : ICommandHandler<TCommand>, ICommandHandlerDecorator where TCommand : ICommand
{
    public async Task<CommandResponse> Handle(TCommand command)
    {
        using (var operation =
               telemetryClient.StartOperation<RequestTelemetry>($"Handle {decoratedHandler.GetType().FullName}",
                   command.CorrelationId.ToString()))
        {
            try
            {
                operation.Telemetry.Properties["CorrelationId"] = command.CorrelationId.ToString();
                operation.Telemetry.Properties["TransactionId"] = command.TransactionId.ToString();

                var result = await decoratedHandler.Handle(command);

                operation.Telemetry.Properties["RequestId"] = result.RequestId.ToString();
                operation.Telemetry.Success = true;

                return result;
            }
            catch (Exception ex)
            {
                operation.Telemetry.Success = false;

                telemetryClient.TrackException(ex, new Dictionary<string, string>
                {
                    ["CorrelationId"] = command.CorrelationId.ToString(),
                    ["Command"] = command.GetType().Name,
                    ["CommandHandler"] = decoratedHandler.GetType().FullName
                });
                throw;
            }
        }
    }
}