Deprecate client/selector (#1767)

* client/{grpc,rpc}: depricate selector (wip)

* {client,cmd}: remove client/selector

* deprecate client/selector

* router/static: fix lookup

* config/cmd: add support for legacy static selector flag

* config/cmd: add support for legacy dns selector flag

api/handler/api/api.go

@@ -6,9 +6,9 @@ import (
 
 	goapi "github.com/micro/go-micro/v2/api"
 	"github.com/micro/go-micro/v2/api/handler"
+	"github.com/micro/go-micro/v2/api/handler/util"
 	api "github.com/micro/go-micro/v2/api/proto"
 	"github.com/micro/go-micro/v2/client"
-	"github.com/micro/go-micro/v2/client/selector"
 	"github.com/micro/go-micro/v2/errors"
 	"github.com/micro/go-micro/v2/util/ctx"
 )
@@ -71,10 +71,8 @@ func (a *apiHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 
 	// create the context from headers
 	cx := ctx.FromRequest(r)
-	// create strategy
-	so := selector.WithStrategy(strategy(service.Services))
 
-	if err := c.Call(cx, req, rsp, client.WithSelectOption(so)); err != nil {
+	if err := c.Call(cx, req, rsp, client.WithRouter(util.Router(service.Services))); err != nil {
 		w.Header().Set("Content-Type", "application/json")
 		ce := errors.Parse(err.Error())
 		switch ce.Code {

api/handler/api/util.go

@@ -8,8 +8,6 @@ import (
 	"strings"
 
 	api "github.com/micro/go-micro/v2/api/proto"
-	"github.com/micro/go-micro/v2/client/selector"
-	"github.com/micro/go-micro/v2/registry"
 	"github.com/oxtoacart/bpool"
 )
 
@@ -109,11 +107,3 @@ func requestToProto(r *http.Request) (*api.Request, error) {
 
 	return req, nil
 }
-
-// strategy is a hack for selection
-func strategy(services []*registry.Service) selector.Strategy {
-	return func(_ []*registry.Service) selector.Next {
-		// ignore input to this function, use services above
-		return selector.Random(services)
-	}
-}