forked from st3v/go-plugins
/
static.go
87 lines (69 loc) · 1.99 KB
/
static.go
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// Package static is a selector which always returns the name specified with a port-number appended.
// AN optional domain-name will also be added.
package static
import (
"fmt"
"os"
"github.com/micro/go-micro/client/selector"
"github.com/micro/go-micro/config/cmd"
"github.com/micro/go-micro/registry"
)
const (
ENV_STATIC_SELECTOR_DOMAIN_NAME = "STATIC_SELECTOR_DOMAIN_NAME"
ENV_STATIC_SELECTOR_PORT_NUMBER = "STATIC_SELECTOR_PORT_NUMBER"
DEFAULT_PORT_NUMBER = "8080"
)
type staticSelector struct {
addressSuffix string
envDomainName string
envPortNumber string
}
func init() {
cmd.DefaultSelectors["static"] = NewSelector
}
func (s *staticSelector) Init(opts ...selector.Option) error {
return nil
}
func (s *staticSelector) Options() selector.Options {
return selector.Options{}
}
func (s *staticSelector) Select(service string, opts ...selector.SelectOption) (selector.Next, error) {
node := ®istry.Node{
Id: service,
Address: fmt.Sprintf("%v%v", service, s.addressSuffix),
}
return func() (*registry.Node, error) {
return node, nil
}, nil
}
func (s *staticSelector) Mark(service string, node *registry.Node, err error) {
return
}
func (s *staticSelector) Reset(service string) {
return
}
func (s *staticSelector) Close() error {
return nil
}
func (s *staticSelector) String() string {
return "static"
}
func NewSelector(opts ...selector.Option) selector.Selector {
// Build a new
s := &staticSelector{
addressSuffix: "",
envDomainName: os.Getenv(ENV_STATIC_SELECTOR_DOMAIN_NAME),
envPortNumber: os.Getenv(ENV_STATIC_SELECTOR_PORT_NUMBER),
}
// Add the dns domain-name (if one was specified by an env-var):
if s.envDomainName != "" {
s.addressSuffix += fmt.Sprintf(".%v", s.envDomainName)
}
// Either add the default port-number, or override with one specified by an env-var:
if s.envPortNumber == "" {
s.addressSuffix += fmt.Sprintf(":%v", DEFAULT_PORT_NUMBER)
} else {
s.addressSuffix += fmt.Sprintf(":%v", s.envPortNumber)
}
return s
}