/// <summary>
/// This requests FE to add a worker.
/// - FE returns success if new worker is assigned.
/// - FE returns 404 No Capacity if no capacity and we will try on other stamps.
/// - Other than that throws.
/// </summary>
public async Task <string> AddWorker(string activityId, IEnumerable <string> stampNames, int workers)
{
var list = stampNames.ToList();
// always scale home stamp first
list.Remove(AppServiceSettings.HomeStampName);
list.Insert(0, AppServiceSettings.HomeStampName);
foreach (var stampName in list)
{
var stampHostName = GetStampHostName(stampName);
var worker = new AppServiceWorkerInfo
{
PartitionKey = AppServiceSettings.SiteName,
StampName = stampName,
WorkerName = string.Empty
};
var details = string.Format("Add worker request from {0}:{1}", AppServiceSettings.CurrentStampName, AppServiceSettings.WorkerName);
var pathAndQuery = string.Format("https://{0}/operations/addworker/{1}?token={2}&workers={3}",
stampHostName,
AppServiceSettings.SiteName,
GetToken(),
workers);
using (var response = await SendAsync(activityId, HttpMethod.Post, pathAndQuery, worker, details))
{
try
{
response.EnsureSuccessStatusCode();
return(stampName);
}
catch (HttpRequestException)
{
// No capicity on this stamp
if (response.StatusCode == HttpStatusCode.NotFound &&
string.Equals(response.ReasonPhrase, NoCapacity, StringComparison.OrdinalIgnoreCase))
{
// try other stamps
continue;
}
throw;
}
}
}
// already try all stamps and still no capacity
return(null);
}
public async Task SetManager(IWorkerInfo worker)
{
// update manager row
var entity = new AppServiceWorkerInfo
{
PartitionKey = AppServiceSettings.ManagerPartitionKey,
RowKey = AppServiceSettings.ManagerRowKey,
StampName = worker.StampName,
WorkerName = worker.WorkerName,
ETag = "*"
};
var operation = TableOperation.InsertOrReplace(entity);
var table = await GetWorkerCloudTable();
await table.ExecuteAsync(operation);
}