/
static_selector.go
81 lines (60 loc) · 1.55 KB
/
static_selector.go
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// Package static provides a static resolver which returns the name/ip passed in without any change
package static
import (
"fmt"
"sync/atomic"
"github.com/Allenxuxu/stark/registry"
sr "github.com/Allenxuxu/stark/rpc/client/resolver"
"github.com/Allenxuxu/stark/rpc/client/selector"
"google.golang.org/grpc/resolver"
)
const scheme = "stark-static"
var _selector atomic.Value
func registerSelector(s selector.Selector) {
_selector.Store(s)
}
func init() {
resolver.Register(sr.NewBuilder(scheme, &_selector))
}
// staticSelector is a static selector
type staticSelector struct {
opts selector.Options
service []*registry.Service
}
func NewSelector(service []*registry.Service, opts ...selector.Option) selector.Selector {
var options selector.Options
for _, o := range opts {
o(&options)
}
s := &staticSelector{
opts: options,
service: service,
}
// fixme do better
registerSelector(s)
return s
}
func (s *staticSelector) Options() selector.Options {
return s.opts
}
func (s *staticSelector) GetService(service string) ([]*registry.Service, error) {
for _, filter := range s.opts.Filters {
s.service = filter(s.service)
}
if len(s.service) == 0 {
return nil, selector.ErrNoneAvailable
}
return s.service, nil
}
func (s *staticSelector) Watch(service string) (registry.Watcher, error) {
return nil, nil
}
func (s *staticSelector) Close() error {
return nil
}
func (s *staticSelector) Address(service string) string {
return fmt.Sprintf("%s:///%s", scheme, service)
}
func (s *staticSelector) String() string {
return "static"
}