public async Task <HealthCheckResult> CheckHealthAsync(HealthCheckContext context, CancellationToken ct)
{
using TransactionScope tran = Tran.BeginScope(IsolationLevel.ReadUncommitted);
using SqlConnection connection = _dbContextFactory.CreateConnection();
await connection.OpenAsync(ct);
SqlCommand cmd = connection.CreateCommand();
cmd.CommandText =
"select top(1) MigrationId from Tds.__EFMigrationsHistory order by MigrationId desc";
object lastMigration = await cmd.ExecuteScalarAsync(ct);
cmd.CommandText = "select count(*) from Tds.__EFMigrationsHistory";
object count = await cmd.ExecuteScalarAsync(ct);
return(HealthCheckResult.Healthy(
CompareMigrationHistoryToAssembly(lastMigration.ToString(), int.Parse(count.ToString() !))));
}
public async Task <WalletReportLine[]> GenerateReportAsync(string accountId, CancellationToken ct)
{
using TransactionScope tran = Tran.BeginScope(IsolationLevel.ReadCommitted);
using AppDbContext ctx = _dbContextFactory.CreateContext();
_logger.LogDebug("Trying calculate balance");
WalletReportLine[] income = await ctx.Set <PaymentEntity>()
.Where(p => p.To == accountId && p.TransactionSuccessful)
.GroupBy(g => g.From)
.Select(s => new WalletReportLine()
{
AccountId = s.Key, Amount = s.Sum(r => r.Amount)
})
.ToArrayAsync(ct);
WalletReportLine[] outcome = await ctx.Set <PaymentEntity>()
.Where(p => p.From == accountId && p.TransactionSuccessful)
.GroupBy(g => g.To)
.Select(s => new WalletReportLine()
{
AccountId = s.Key, Amount = -s.Sum(r => r.Amount)
})
.ToArrayAsync(ct);
WalletReportLine[] report =
income.Union(outcome)
.GroupBy(g => g.AccountId)
.Select(s => new WalletReportLine()
{
AccountId = s.Key, Amount = s.Sum(r => r.Amount)
})
.ToArray();
_logger.LogDebug("The balance is calculated");
tran.Complete();
return(report);
}
private async Task SavePaymentsAsync(PaymentEntity[] payments, CancellationToken ct)
{
if (!payments.Any())
{
return;
}
using TransactionScope tran = Tran.BeginScope(IsolationLevel.Serializable);
using AppDbContext ctx = _dbContextFactory.CreateContext();
IEnumerable <long> range = payments.Select(p => p.Id);
_logger.LogDebug("Trying to fetch existed payments in range {0}", range);
ctx.SelectWithUpdLock = true;
long[] existingPayments = await ctx.Set <PaymentEntity>()
.Where(p => range.Contains(p.Id))
.AsNoTracking()
.Select(p => p.Id)
.ToArrayAsync(ct);
_logger.LogDebug("{0} payments found", existingPayments.Length);
PaymentEntity[] paymentsToSave =
payments.Where(p => !existingPayments
.Contains(p.Id)).ToArray();
_logger.LogDebug("Trying to save new payments {0}", (object)paymentsToSave);
ctx.Set <PaymentEntity>().AddRange(paymentsToSave);
await ctx.SaveChangesAsync(ct);
tran.Complete();
_logger.LogDebug("{0} new payments successfully saved", paymentsToSave.Count());
}
