Restructure cloudmigration service (#83211)

* Restructure cloudmigation service

* Adjust codewoners and wire

* Comment out unused metrics

pkg/services/cloudmigration/cloudmigrationimpl/cloudmigration.go

@@ -0,0 +1,67 @@
+package cloudmigrationimpl
+
+import (
+	"context"
+
+	"github.com/grafana/grafana/pkg/api/routing"
+	"github.com/grafana/grafana/pkg/infra/db"
+	"github.com/grafana/grafana/pkg/infra/log"
+	"github.com/grafana/grafana/pkg/services/cloudmigration"
+	"github.com/grafana/grafana/pkg/services/cloudmigration/api"
+	"github.com/grafana/grafana/pkg/services/datasources"
+	"github.com/grafana/grafana/pkg/services/featuremgmt"
+	"github.com/grafana/grafana/pkg/setting"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+// CloudMigrationsServiceImpl Define the Service Implementation.
+type Service struct {
+	store store
+
+	log log.Logger
+	cfg *setting.Cfg
+
+	features  featuremgmt.FeatureToggles
+	dsService datasources.DataSourceService
+
+	api *api.MigrationAPI
+	// metrics *Metrics
+}
+
+var LogPrefix = "cloudmigration.service"
+
+var _ cloudmigration.Service = (*Service)(nil)
+
+// ProvideService Factory for method used by wire to inject dependencies.
+// builds the service, and api, and configures routes
+func ProvideService(
+	cfg *setting.Cfg,
+	features featuremgmt.FeatureToggles,
+	db db.DB,
+	dsService datasources.DataSourceService,
+	routeRegister routing.RouteRegister,
+	prom prometheus.Registerer,
+) cloudmigration.Service {
+	if !features.IsEnabledGlobally(featuremgmt.FlagOnPremToCloudMigrations) {
+		return &NoopServiceImpl{}
+	}
+
+	s := &Service{
+		store:     &sqlStore{db: db},
+		log:       log.New(LogPrefix),
+		cfg:       cfg,
+		features:  features,
+		dsService: dsService,
+	}
+	s.api = api.RegisterApi(routeRegister, s)
+
+	if err := s.registerMetrics(prom); err != nil {
+		s.log.Warn("error registering prom metrics", "error", err.Error())
+	}
+
+	return s
+}
+
+func (s *Service) MigrateDatasources(ctx context.Context, request *cloudmigration.MigrateDatasourcesRequest) (*cloudmigration.MigrateDatasourcesResponse, error) {
+	return s.store.MigrateDatasources(ctx, request)
+}

pkg/services/cloudmigration/cloudmigrationimpl/cloudmigration_noop.go

@@ -0,0 +1,16 @@
+package cloudmigrationimpl
+
+import (
+	"context"
+
+	"github.com/grafana/grafana/pkg/services/cloudmigration"
+)
+
+// CloudMigrationsServiceImpl Define the Service Implementation.
+type NoopServiceImpl struct{}
+
+var _ cloudmigration.Service = (*NoopServiceImpl)(nil)
+
+func (s *NoopServiceImpl) MigrateDatasources(ctx context.Context, request *cloudmigration.MigrateDatasourcesRequest) (*cloudmigration.MigrateDatasourcesResponse, error) {
+	return nil, cloudmigration.ErrFeatureDisabledError
+}

pkg/services/cloudmigration/cloudmigrationimpl/cloudmigration_test.go

@@ -0,0 +1,15 @@
+package cloudmigrationimpl
+
+import (
+	"context"
+	"testing"
+
+	"github.com/grafana/grafana/pkg/services/cloudmigration"
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_NoopServiceDoesNothing(t *testing.T) {
+	s := &NoopServiceImpl{}
+	_, e := s.MigrateDatasources(context.Background(), &cloudmigration.MigrateDatasourcesRequest{})
+	assert.ErrorIs(t, e, cloudmigration.ErrFeatureDisabledError)
+}

pkg/services/cloudmigration/cloudmigrationimpl/metric.go

@@ -0,0 +1,26 @@
+package cloudmigrationimpl
+
+import (
+	"errors"
+
+	"github.com/grafana/grafana/pkg/services/cloudmigration"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+// type Metrics struct {
+// 	log log.Logger
+// }
+
+func (s *Service) registerMetrics(prom prometheus.Registerer) error {
+	for _, m := range cloudmigration.PromMetrics {
+		if err := prom.Register(m); err != nil {
+			var alreadyRegisterErr prometheus.AlreadyRegisteredError
+			if errors.As(err, &alreadyRegisterErr) {
+				s.log.Warn("metric already registered", "metric", m)
+				continue
+			}
+			return err
+		}
+	}
+	return nil
+}

pkg/services/cloudmigration/cloudmigrationimpl/store.go

@@ -0,0 +1,11 @@
+package cloudmigrationimpl
+
+import (
+	"context"
+
+	"github.com/grafana/grafana/pkg/services/cloudmigration"
+)
+
+type store interface {
+	MigrateDatasources(context.Context, *cloudmigration.MigrateDatasourcesRequest) (*cloudmigration.MigrateDatasourcesResponse, error)
+}

pkg/services/cloudmigration/cloudmigrationimpl/xorm_store.go

@@ -0,0 +1,16 @@
+package cloudmigrationimpl
+
+import (
+	"context"
+
+	"github.com/grafana/grafana/pkg/infra/db"
+	"github.com/grafana/grafana/pkg/services/cloudmigration"
+)
+
+type sqlStore struct {
+	db db.DB
+}
+
+func (ss *sqlStore) MigrateDatasources(ctx context.Context, request *cloudmigration.MigrateDatasourcesRequest) (*cloudmigration.MigrateDatasourcesResponse, error) {
+	return nil, cloudmigration.ErrInternalNotImplementedError
+}

pkg/services/cloudmigration/cloudmigrationimpl/xorm_store_test.go

@@ -0,0 +1,9 @@
+package cloudmigrationimpl
+
+import (
+	"testing"
+)
+
+func TestMigrateDatasources(t *testing.T) {
+	// TODO: Write this test
+}