public static async Task <IActionResult> Run(
[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
ILogger log, ExecutionContext context)
{
string logString;
#region Capture init strings
DateTime TimeOfCreation;
CultureInfo provider = CultureInfo.InvariantCulture;
string ScaleSetId = Environment.GetEnvironmentVariable("ScaleSetId");
int LookupTimeInMinutes = int.Parse(Environment.GetEnvironmentVariable("LookupTimeInMin"));
int CPUTreshold = int.Parse(Environment.GetEnvironmentVariable("CPUTresholdInPercent"));
int DiskTresholdBytes = int.Parse(Environment.GetEnvironmentVariable("DiskTresholdBytes"));
int MinNumNodes = int.Parse(Environment.GetEnvironmentVariable("MinNumNodes"));
string TablePrefix = Environment.GetEnvironmentVariable("TablePrefix");
string StorageAccountConnectionString = Environment.GetEnvironmentVariable("StorageAccountConnectionString");
//We need store datetime value in base64 because azure function host automatially convert it to short date/time format
//without time zone info.
bool parseddate = DateTime.TryParseExact(
Encoding.UTF8.GetString(
Convert.FromBase64String(
Environment.GetEnvironmentVariable("TimeOfCreation"))), "yyyy-MM-ddTHH:mm:ssZ", provider, DateTimeStyles.AdjustToUniversal, out TimeOfCreation);
TimeSpan StartupDelayInMin = TimeSpan.FromMinutes(double.Parse(Environment.GetEnvironmentVariable("StartupDelayInMin")));
var timeInPast = DateTime.UtcNow.Subtract(StartupDelayInMin);
if (String.IsNullOrEmpty(ScaleSetId) || LookupTimeInMinutes <= 0 || CPUTreshold <= 0 || DiskTresholdBytes <= 0 ||
String.IsNullOrEmpty(TablePrefix) || String.IsNullOrEmpty(StorageAccountConnectionString) || !parseddate)
{
logString = $"HTTP trigger function started but not all init params are set";
log.LogInformation(logString);
return((ActionResult) new OkObjectResult(logString));
}
#endregion
//Checking is the time right to start scaling, probably initial delay is not come yet
if (TimeOfCreation.ToUniversalTime() <= timeInPast)
{
log.LogInformation("HTTP trigger function processed a request and will try to adjust scaleset. " + ScaleSetId);
ScaleSetManager manager = new ScaleSetManager(ScaleSetId, context, log);
var metrics = manager.GetMetricsFromTable(StorageAccountConnectionString, LookupTimeInMinutes, TablePrefix);
var instances = manager.GetInstancesToKill(metrics, CPUTreshold, DiskTresholdBytes);
var dealocated = manager.DealocateInstances(instances, MinNumNodes);
logString = $"Done, number of dealocated instances {dealocated.Count.ToString()}: {String.Join(", ", dealocated.ToArray())}";
log.LogInformation(logString);
}
else
{
logString = $"HTTP trigger function processed but Its to early to scale cluster time not come.";
log.LogInformation(logString);
}
return((ActionResult) new OkObjectResult(logString));
}
/// <summary>
/// Создает каталожную запись с актуальными временными параметрами
/// </summary>
/// <param name="attributes">атрибуты файла</param>
/// <param name="fileSize">размер файла</param>
/// <param name="firstBlockNumber">номер первого кластера этого файла в FAT</param>
/// <param name="name">имя файла</param>
/// <param name="extension">расширение файла</param>
public CatalogEntry(Attributes attributes, int fileSize, int firstBlockNumber, string name, string extension)
{
Name = name;
Attributes = attributes;
Extension = extension;
FirstBlockNumber = firstBlockNumber;
FileSize = fileSize;
DateOfCreation.SetCurrentDate();
LastAccessDate.SetCurrentDate();
LastDateRecorded.SetCurrentDate();
LastTimeRecorded.SetCurrentTime();
TimeOfCreation.SetCurrentTime();
}
