micro/selector/default.go

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package selector
import (
"github.com/micro/go-micro/registry"
)
type defaultSelector struct {
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so Options
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}
func (r *defaultSelector) Init(opts ...Option) error {
for _, o := range opts {
o(&r.so)
}
return nil
}
func (r *defaultSelector) Options() Options {
return r.so
}
func (r *defaultSelector) Select(service string, opts ...SelectOption) (Next, error) {
sopts := 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)
}
// if there's nothing left, return
if len(services) == 0 {
return nil, ErrNoneAvailable
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}
return sopts.Strategy(services), nil
}
func (r *defaultSelector) Mark(service string, node *registry.Node, err error) {
}
func (r *defaultSelector) Reset(service string) {
}
func (r *defaultSelector) Close() error {
return nil
}
func (r *defaultSelector) String() string {
return "default"
}
func newDefaultSelector(opts ...Option) Selector {
sopts := Options{
Strategy: Random,
}
for _, opt := range opts {
opt(&sopts)
}
if sopts.Registry == nil {
sopts.Registry = registry.DefaultRegistry
}
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return &defaultSelector{
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so: sopts,
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}
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}