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Add retry policy for domain event handling #738

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Merged
merged 1 commit into from
Feb 26, 2025
Merged

Add retry policy for domain event handling #738

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53 changes: 24 additions & 29 deletions TransactionProcessor.BusinessLogic/EventHandling/MerchantDomainEventHandler.cs
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Original file line number Diff line number Diff line change
@@ -1,14 +1,16 @@
using System;
using System.Threading;
using System.Threading.Tasks;
using MediatR;
using MediatR;
using Newtonsoft.Json;
using Polly;
using Shared.DomainDrivenDesign.EventSourcing;
using Shared.EventStore.Aggregate;
using Shared.EventStore.EventHandling;
using Shared.Results;
using SimpleResults;
using System;
using System.Threading;
using System.Threading.Tasks;
using TransactionProcessor.Aggregates;
using TransactionProcessor.BusinessLogic.Common;
using TransactionProcessor.BusinessLogic.Events;
using TransactionProcessor.BusinessLogic.Requests;
using TransactionProcessor.Models.Merchant;
Expand Down Expand Up @@ -59,34 +61,27 @@ public async Task<Result> Handle(IDomainEvent domainEvent,
private async Task<Result> HandleSpecificDomainEvent(CallbackReceivedEnrichedEvent domainEvent,
CancellationToken cancellationToken)
{
if (domainEvent.TypeString == typeof(CallbackHandler.DataTransferObjects.Deposit).ToString())
{
// Work out the merchant id from the reference field (second part, split on hyphen)
String merchantReference = domainEvent.Reference.Split("-")[1];

Result<Merchant> result = await this.EstateReportingRepository.GetMerchantFromReference(domainEvent.EstateId, merchantReference, cancellationToken);
if (result.IsFailed)
return ResultHelpers.CreateFailure(result);

// We now need to deserialise the message from the callback
CallbackHandler.DataTransferObjects.Deposit callbackMessage = JsonConvert.DeserializeObject<CallbackHandler.DataTransferObjects.Deposit>(domainEvent.CallbackMessage);

MerchantCommands.MakeMerchantDepositCommand command = new(domainEvent.EstateId,
result.Data.MerchantId,
DataTransferObjects.Requests.Merchant.MerchantDepositSource.Automatic,
new MakeMerchantDepositRequest
{
DepositDateTime = callbackMessage.DateTime,
Reference = callbackMessage.Reference,
Amount = callbackMessage.Amount,
});
return await this.Mediator.Send(command, cancellationToken);
}
return Result.Success();
}
IAsyncPolicy<Result> retryPolicy = PolicyFactory.CreatePolicy(2, policyTag: "MerchantSettlementDomainEventHandler - MerchantFeeSettledEvent");

return await retryPolicy.ExecuteAsync(async () => {
if (domainEvent.TypeString == typeof(CallbackHandler.DataTransferObjects.Deposit).ToString()) {
// Work out the merchant id from the reference field (second part, split on hyphen)
String merchantReference = domainEvent.Reference.Split("-")[1];

Result<Merchant> result = await this.EstateReportingRepository.GetMerchantFromReference(domainEvent.EstateId, merchantReference, cancellationToken);
if (result.IsFailed)
return ResultHelpers.CreateFailure(result);

// We now need to deserialise the message from the callback
CallbackHandler.DataTransferObjects.Deposit callbackMessage = JsonConvert.DeserializeObject<CallbackHandler.DataTransferObjects.Deposit>(domainEvent.CallbackMessage);

MerchantCommands.MakeMerchantDepositCommand command = new(domainEvent.EstateId, result.Data.MerchantId, DataTransferObjects.Requests.Merchant.MerchantDepositSource.Automatic, new MakeMerchantDepositRequest { DepositDateTime = callbackMessage.DateTime, Reference = callbackMessage.Reference, Amount = callbackMessage.Amount, });
return await this.Mediator.Send(command, cancellationToken);
}

return Result.Success();
});
}

#endregion
}
Expand Down
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