/// <summary>
/// Poll each service identifer using serivce discovery to determine their state of responsiveness.
/// </summary>
private async Task ResolveServicesState(IEnumerable <Service> serviceIdentifiers)
{
var serviceStateTasks = new List <Task>();
var _services = new Dictionary <string, ServiceResult>();
Logger.LogInformation($"{nameof(ResolvePollingServices)}: Resolving services for polling...");
var aggregatedServiceState = ServiceState.Unknown;
foreach (var service in serviceIdentifiers)
{
serviceStateTasks
.Add(QueryService(service)
.ContinueWith(x =>
{
if (!x.IsCompleted || x.Result == null)
{
Logger.LogError($"{nameof(ResolveServicesState)}: Failure querying service '{service.Identifier}' at '{service.Endpoint}'; {x.Exception.GetBaseException().Message}");
return;
}
var servicePingResponse = x.Result;
_healthCheckState.AddServicePingResponse(service.Identifier, servicePingResponse);
if (servicePingResponse.State != ServiceState.Available)
{
aggregatedServiceState = ServiceState.Unavailable;
}
if (aggregatedServiceState != ServiceState.Unavailable)
{
aggregatedServiceState = ServiceState.Available;
}
}));
}
await Task.WhenAll(serviceStateTasks);
Logger.LogInformation($"{nameof(ResolveServicesState)}: Setting aggregated service state to: {aggregatedServiceState}");
_healthCheckState.SetAggregatedServiceState(aggregatedServiceState);
}
