private static async Task CheckItemPrice(Item item)
{
if (item.SubscribersEmails.Length == 0)
{
await DeleteUnusedItem(item);
return;
}
decimal currentPrice = 0;
try
{
currentPrice = await PriceParser.Parse(item, cache);
}
catch (Exception ex)
{
log.LogError($"Can't parse url {item.Url}: {ex.Message}.");
Errors += $"Can't parse url {item.Url}: {ex.Message}.<br>";
return;
}
log.LogInformation($"Item {item.Name} price: {currentPrice} rub.");
Price prevPrice;
try
{
prevPrice = await priceDb.GetLastItemPriceAsync(item);
}
catch
{
try
{
await priceDb.CreateItemPriceAsync(item, currentPrice);
}catch (Exception ex)
{
log.LogError($"Can't write item price to db: {ex.Message}.");
}
return;
}
if (currentPrice < prevPrice.ItemPrice)
{
await NotifyOfPriceReduction(item, currentPrice, prevPrice);
}
if (currentPrice == prevPrice.ItemPrice)
{
return;
}
Price newPrice;
try
{
newPrice = await priceDb.CreateItemPriceAsync(item, currentPrice);
}
catch (Exception ex)
{
log.LogError($"Can't save item {item.Name} price {currentPrice} to db: {ex.Message}.");
}
}