private string MakeJsonPayload(SendAlertModel sam)
{
string errorMessage = $"The machine {sam.MachineId} has error {sam.AlarmCode}!";
string jsonPayload = JsonConvert.SerializeObject(new { data = new { message = errorMessage } });
return(jsonPayload);
}
private void CreateAlarmLog(SendAlertModel sam)
{
AlarmSystem.Core.Entity.Dto.Alarm alarm = _alarmService.GetAlarmByCode(sam.AlarmCode);
AlarmSystem.Core.Entity.Dto.Machine machine = _machineService.GetMachineById(sam.MachineId);
var date = DateTime.UtcNow;
long epochOfNow = new DateTimeOffset(date).ToUnixTimeMilliseconds();
AlarmSystem.Core.Entity.Dto.AlarmLog al = new AlarmSystem.Core.Entity.Dto.AlarmLog()
{
Alarm = alarm, Machine = machine, Date = epochOfNow
};
_alarmLogService.CreateAlarmLog(al);
}
public async Task <IActionResult> Run(
[HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = "notify")] HttpRequest req,
ILogger log)
{
string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
SendAlertModel sam = JsonConvert.DeserializeObject <SendAlertModel>(requestBody);
List <string> watches = new List <string>();
AlarmSystem.Core.Entity.DB.AlarmLog alarmLog;
try
{
watches = GetWatchesToNotify(sam);
alarmLog = CreateAlarmLog(sam);
}
catch (InvalidDataException e)
{
return(new BadRequestObjectResult(e.Message));
}
catch (EntityNotFoundException e)
{
return(new NotFoundObjectResult(e.Message));
}
string accessSignature = Environment.GetEnvironmentVariable("DefaultFullSharedAccessSignature");
string hubName = Environment.GetEnvironmentVariable("NotificationHubName");
Microsoft.Azure.NotificationHubs.Notification nof = new FcmNotification(MakeJsonPayload(alarmLog));
if (watches.Count == 0)
{
return(new NoContentResult());
}
foreach (string watch in watches)
{
await _hub.SendDirectNotificationAsync(nof, watch);
}
return(new OkResult());
}
private List <string> GetWatchesToNotify(SendAlertModel sam)
{
List <string> watches = new List <string>();
List <MachineWatch> machineSubscriptions = _watchService.GetMachineSubscriptionsByMachine(sam.MachineId);
List <AlarmWatch> alarmSubscriptions = _watchService.GetAlarmSubscriptionsByAlarmCode(sam.AlarmCode);
foreach (MachineWatch mw in machineSubscriptions)
{
watches.Add(mw.WatchId);
}
//Since a watch can both be subscribed to a machine and an alarm. We don't want to send the same notification twice to one watch
//This should probably be optimised so we can combine the two subscriptions list without duplicates
foreach (AlarmWatch aw in alarmSubscriptions)
{
bool alreadyIn = watches.Contains(aw.WatchId);
if (!alreadyIn)
{
watches.Add(aw.WatchId);
}
}
return(watches);
}
