private static async Task RunAlertDispatcher(ILogger log, CloudTable subscribersTable, IAsyncCollector <Alert> outputQueueItem, bool trackDailyChange)
{
TickerHistory tickerHistory = await QueryTickerService(log);
foreach (Datum data in tickerHistory.Data)
{
log.LogInformation($"USD to BTC at {data.Time.ToString()}: {data.Close}");
}
await SendAlertsToSubscribers(log, subscribersTable, outputQueueItem, trackDailyChange, tickerHistory);
}
private static async Task <TickerHistory> QueryTickerService(ILogger log)
{
HttpResponseMessage response = await httpClient.GetAsync(BuildTickerServiceUri());
HttpContent responseContent = response.Content;
using (StreamReader reader = new StreamReader(await responseContent.ReadAsStreamAsync()))
{
string result = await reader.ReadToEndAsync();
TickerHistory history = JsonConvert.DeserializeObject <TickerHistory>(result);
return(history);
}
}
private static async Task SendAlertsToSubscribers(ILogger log, CloudTable subscribersTable, IAsyncCollector <Alert> outputQueueItem, bool trackDailyChange, TickerHistory history)
{
decimal latest = history.Data[history.Data.Length - 1].Close;
decimal lastHour = history.Data[history.Data.Length - 2].Open;
decimal lastDay = history.Data[0].Close;
decimal lastHourChange = (latest - lastHour) / lastHour;
decimal lastDayChange = (latest - lastDay) / lastDay;
log.LogInformation($"Last hour change: {decimal.Round(lastHourChange * 100, 2)}%");
log.LogInformation($"Last day change: {decimal.Round(lastDayChange * 100, 2)}%");
decimal trackedChange = (trackDailyChange ? Math.Max(Math.Abs(lastHourChange), Math.Abs(lastDayChange)) : Math.Abs(lastHourChange)) * 100;
if (trackedChange >= 1)
{
foreach (int levelOfAlert in Enumerable.Range(1, (int)trackedChange))
{
await SendAlertsForLevel(log, subscribersTable, outputQueueItem, lastHourChange, lastDayChange, latest, levelOfAlert);
}
}
}