/// <inheritdoc />
public async Task <CdnServer> GetNearestServerAsync(double longitude,
double latitude,
CdnServerRole serverRole,
List <int> excludeServers = null)
{
var clientCoordinate = new GeoCoordinate(latitude, longitude);
var servers = (await _cdnServerRepository.GetServersAsync(serverRole))
.Where(s => excludeServers == null || !excludeServers.Contains(s.Id))
.ToList();
if (!servers?.Any() ?? true)
{
throw new NoSuitableServerExcetion($"No found any servers in role '{serverRole}'");
}
//Calculate distances and return nearest server
return(servers.Select(s => new
{
Server = s,
Distance = new GeoCoordinate(s.Latitude, s.Longitude).GetDistanceTo(clientCoordinate)
})
.OrderBy(s => s.Distance)
.Select(s => s.Server)
.First());
}