// Main method for checking if any of the stored flights (being followed by users) have changed their prices
public async Task <bool> CheckForPriceUpdates(Dictionary <string, Airport> airports, FlightDetails fd,
Activity activity, ConnectorClient connector, string guid)
{
bool changed = false;
try
{
// Connects to Azure Table Storage in order to retrieve th details of
// flights being watched by users
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
CloudConfigurationManager.GetSetting(StrConsts.cStrStorageConnectionStr));
CloudTableClient tableClient = storageAccount.CreateCloudTableClient();
CloudTable table = tableClient.GetTableReference(
CloudConfigurationManager.GetSetting(StrConsts.cStrBotId));
TableQuery <TravelEntity> query = new TableQuery <TravelEntity>().
Where(TableQuery.GenerateFilterCondition("PartitionKey", QueryComparisons.NotEqual, string.Empty));
// Gets all the flights being watched
IEnumerable <TravelEntity> results = table.ExecuteQuery(query);
// Let's check if any of the flights stored have a change in price
foreach (TravelEntity entity in results)
{
TripsSearchResponse result = null;
TripOptionsRequest req = null;
// Get the details of a stored flight (being followed)
fd = GetStoredFlightData(entity, storageAccount, out req);
// If the stored flight was submitted by the user currently
// interacting with our bot - very important :)
if (fd.UserId.ToLower() == activity.From.Id.ToLower())
{
// Query the QPX Express API to see if the current price
// of the flight stored differs
string res = ShowUpdatedResults(airports, fd, out result);
// If the flight is still relevant (has not expired)
if (res != string.Empty)
{
// If indeed the current price differs from when it was
// originally requested by the user
if (PriceHasChanged(entity, result, storageAccount))
{
changed = true;
// Save the new flight price on Azure Storage Table
using (TableStorage ts = new TableStorage(req, result, fd))
guid = ts.Save();
changed = true;
// Create the response with the current flight price that will be
// sent back to the user
Activity reply = activity.CreateReply(GatherQuestions.cStrPriceChange +
StrConsts._NewLine + StrConsts._NewLine + res + StrConsts._NewLine +
StrConsts._NewLine + GatherQuestions.cStrGatherRequestProcessed +
StrConsts._NewLine + StrConsts._NewLine +
GatherQuestions.cStrUnFollow + guid);
await connector.Conversations.ReplyToActivityAsync(reply);
}
}
else
{
// The flight is no longer relevant
// so it should be removed from Azure Storage
RemoveEntity(GetKey(fd));
}
}
}
}
catch { }
// If there has been a price change
// return true
return(changed);
}
