/// <summary>
/// Queries the local Consul agent for healthy instances of a given service and selects one such instance.
/// </summary>
/// <param name="query">Query used to find services instances.</param>
/// <exception cref="NoAvailableServiceInstanceException">Thrown when there is no healthy instance available for that service.</exception>
/// <returns>Returns a service instance.</returns>
public ServiceInstanceDescriptor GetServiceInstance(ServiceInstanceQuery query, ServiceInstanceSelectionStrategy?strategy = null)
{
IServiceInstanceSelectionStrategy selectionStrategy = null;
if (strategy.HasValue)
{
selectionStrategy = InitializeServiceInstanceSelectionStrategy(strategy.Value);
}
else
{
selectionStrategy = DefaultServiceInstanceSelectionStrategy;
}
if (selectionStrategy == null)
{
throw new MagellanException("Could not initialize any service instance selection strategy.");
}
//Query for available instances
ICollection <ServiceInstanceDescriptor> availableInstances = GetServiceInstances(query);
//Select instance
if (availableInstances.Count > 0)
{
return(selectionStrategy.SelectServiceInstance(availableInstances));
}
else
{
throw new NoAvailableServiceInstanceException();
}
}
/// <summary>
/// Queries the local Consul agent for all healthy instances of a given service.
/// </summary>
/// <param name="query">Query used to find service instances.</param>
/// <returns>Returns all available services</returns>
public ICollection <ServiceInstanceDescriptor> GetServiceInstances(ServiceInstanceQuery query)
{
ServiceEntry[] serviceInstances = Consul.Health.Service(query.Service, "", true).Result.Response;
return(serviceInstances.Select(si => new ServiceInstanceDescriptor(si.Service)).ToList());
}