private async Task ProcessRuleAsync(MonitoringRule rule)
{
try
{
var lastNotificationDate = await _notificationsCache.GetLastNotificationDateAsync(rule.Id);
if (rule.NeedsNotification(lastNotificationDate))
{
var action = new SendNotificationMonitoringAction();
rule.ActionsByTypeName[action.TypeName].CopyTo(action);
if (string.IsNullOrWhiteSpace(action.NotificationChannelId))
{
await _notificationSender.SendAsync(rule.GetNotificationText());
}
else
{
await _notificationSender.SendAsync(action.NotificationChannelId, rule.GetNotificationText());
}
await _notificationsCache.AddOrUpdateAsync(rule.Id,
DateTime.UtcNow.Add(MonitoringRuleExtensions.NotificationRemindPeriod));
}
}
catch (Exception ex)
{
_logger.LogError(ex, "Failed to ProcessRule. {@Rule}", rule.Name);
}
}
public static bool NeedsNotification(this MonitoringRule rule, DateTime?lastNotificationDate)
{
lastNotificationDate ??= DateTime.MinValue;
var action = new SendNotificationMonitoringAction();
if (rule.ActionsByTypeName == null || !rule.ActionsByTypeName.TryGetValue(action.TypeName, out _))
{
return(false);
}
if (rule.CurrentState == null)
{
return(false);
}
if (rule.CurrentState.IsActive != rule.PrevState?.IsActive)
{
return(true);
}
var timeToRemind = DateTime.UtcNow - lastNotificationDate > NotificationRemindPeriod;
if (rule.CurrentState.IsActive && timeToRemind)
{
return(true);
}
return(false);
}
private bool Evaluate(MonitoringRule rule, MonitoringItem loggingItem)
{
var lambdaParser = new NReco.Linq.LambdaParser();
var varContext = new Dictionary <string, object> {
["LoggingItem"] = loggingItem, ["Warning"] = LogLevel.Warning, ["Error"] = LogLevel.Error, ["Information"] = LogLevel.Information
};
return((bool)lambdaParser.Eval(rule.Rule, varContext));
}
public static string GetNotificationText(this MonitoringRule rule)
{
var ruleChecks = rule.Checks ?? new List <PortfolioCheck>();
var title =
$"Rule <b>{rule.Name}</b> is {(rule.CurrentState.IsActive ? "active" : "inactive")}:{Environment.NewLine}{rule.Description}";
var checkDescriptions = ruleChecks.Select(ch => ch.GenerateCheckDescription());
var body = string.Join($"{Environment.NewLine}", checkDescriptions);
return($"{title}{Environment.NewLine}" +
$"{body}{Environment.NewLine}{Environment.NewLine}" +
$"Date: {rule.CurrentState.Date:yyyy-MM-dd hh:mm:ss}");
}
