Enable Grafana extensions at build time. (#11752)

* extensions: import and build

* bus: use predefined error

* enterprise: build script for enterprise packages

* poc: auto registering services and dependency injection

(cherry picked from commit b5b1ef875f905473af41e49f8071cb9028edc845)

* poc: backend services registry progress

(cherry picked from commit 97be69725881241bfbf1e7adf0e66801d6b0af3d)

* poc: minor update

(cherry picked from commit 03d7a6888b81403f458b94305792e075568f0794)

* ioc: introduce manuel ioc

* enterprise: adds setting for enterprise

* build: test and build specific ee commit

* cleanup: test testing code

* removes example hello service

pkg/services/search/handlers.go

@@ -5,13 +5,23 @@ import (
 
 	"github.com/grafana/grafana/pkg/bus"
 	m "github.com/grafana/grafana/pkg/models"
+	"github.com/grafana/grafana/pkg/registry"
 )
 
-func Init() {
-	bus.AddHandler("search", searchHandler)
+func init() {
+	registry.RegisterService(&SearchService{})
 }
 
-func searchHandler(query *Query) error {
+type SearchService struct {
+	Bus bus.Bus `inject:""`
+}
+
+func (s *SearchService) Init() error {
+	s.Bus.AddHandler(s.searchHandler)
+	return nil
+}
+
+func (s *SearchService) searchHandler(query *Query) error {
 	dashQuery := FindPersistedDashboardsQuery{
 		Title:        query.Title,
 		SignedInUser: query.SignedInUser,

pkg/services/search/handlers_test.go

@@ -12,6 +12,7 @@ func TestSearch(t *testing.T) {
 
 	Convey("Given search query", t, func() {
 		query := Query{Limit: 2000, SignedInUser: &m.SignedInUser{IsGrafanaAdmin: true}}
+		ss := &SearchService{}
 
 		bus.AddHandler("test", func(query *FindPersistedDashboardsQuery) error {
 			query.Result = HitList{
@@ -35,7 +36,7 @@ func TestSearch(t *testing.T) {
 		})
 
 		Convey("That is empty", func() {
-			err := searchHandler(&query)
+			err := ss.searchHandler(&query)
 			So(err, ShouldBeNil)
 
 			Convey("should return sorted results", func() {