43 lines
1.7 KiB
C#
43 lines
1.7 KiB
C#
using FinancialApi.Application;
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using Microsoft.EntityFrameworkCore;
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using Wolverine.Attributes;
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using Wolverine.Persistence;
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namespace FinancialApi.Infrastructure;
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public record TransferFundsCommand(int SourceAccountId, int DestinationAccountId, decimal Amount);
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public record FundsTransferredEvent(int SourceAccountId, int DestinationAccountId, decimal Amount);
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// A simple container to pass our loaded entities into the pure function
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public record TransferPair(Account Source, Account Destination);
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public static class TransferFundsHandler
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{
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public static async Task<TransferPair?> LoadAsync(TransferFundsCommand cmd, AccountDbContext db)
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{
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var source = await db.Accounts.AsNoTracking().FirstOrDefaultAsync(x => x.Id == cmd.SourceAccountId);
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var dest = await db.Accounts.AsNoTracking().FirstOrDefaultAsync(x => x.Id == cmd.DestinationAccountId);
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if (source == null || dest == null) return null; // Wolverine drops into a 404/Problem if null
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return new TransferPair(source, dest);
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}
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[Transactional]
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public static (
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IStorageAction<Account> SourceWrite,
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IStorageAction<Account> DestWrite,
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FundsTransferredEvent Event
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) Handle(TransferFundsCommand cmd, TransferPair pair)
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{
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var updatedSource = pair.Source.Debit(cmd.Amount);
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var updatedDest = pair.Destination.Credit(cmd.Amount);
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var sourcePersistence = Storage.Update(updatedSource);
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var destPersistence = Storage.Update(updatedDest);
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var @event = new FundsTransferredEvent(cmd.SourceAccountId, cmd.DestinationAccountId, cmd.Amount);
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return (sourcePersistence, destPersistence, @event);
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}
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} |