func (c *cacheSelector) Select(service string, opts ...selector.SelectOption) (selector.Next, error) {
sopts := selector.SelectOptions{
Strategy: c.so.Strategy,
}
for _, opt := range opts {
opt(&sopts)
}
// get the service
// try the cache first
// if that fails go directly to the registry
services, err := c.get(service)
if err != nil {
return nil, err
}
// apply the filters
for _, filter := range sopts.Filters {
services = filter(services)
}
// if there's nothing left, return
if len(services) == 0 {
return nil, selector.ErrNoneAvailable
}
return sopts.Strategy(services), nil
}
func (r *blacklistSelector) Select(service string, opts ...selector.SelectOption) (selector.Next, error) {
sopts := selector.SelectOptions{
Strategy: r.so.Strategy,
}
for _, opt := range opts {
opt(&sopts)
}
// get the service
services, err := r.so.Registry.GetService(service)
if err != nil {
return nil, err
}
// apply the filters
for _, filter := range sopts.Filters {
services = filter(services)
}
// apply the blacklist
services, err = r.bl.Filter(services)
if err != nil {
return nil, err
}
// if there's nothing left, return
if len(services) == 0 {
return nil, selector.ErrNoneAvailable
}
return sopts.Strategy(services), nil
}