CMS: Create local implementation of cloud migration for dev use (#86637)

* add developer mode property to config

* create cms stub

* cleanup

* implement and wire up gcom stub

* fix errors

* don't document the flag

pkg/services/cloudmigration/cmsclient/client.go

@@ -0,0 +1,17 @@
+package cmsclient
+
+import (
+	"context"
+
+	"github.com/grafana/grafana/pkg/services/cloudmigration"
+	"github.com/grafana/grafana/pkg/util/errutil"
+)
+
+type Client interface {
+	ValidateKey(context.Context, cloudmigration.CloudMigration) error
+	MigrateData(context.Context, cloudmigration.CloudMigration, cloudmigration.MigrateDataRequestDTO) (*cloudmigration.MigrateDataResponseDTO, error)
+}
+
+const logPrefix = "cloudmigration.cmsclient"
+
+var ErrMigrationNotDeleted = errutil.Internal("cloudmigrations.developerModeEnabled", errutil.WithPublicMessage("Developer mode enabled"))

pkg/services/cloudmigration/cmsclient/cms_client.go

@@ -11,26 +11,20 @@ import (
 	"github.com/grafana/grafana/pkg/services/cloudmigration"
 )
 
-type Client interface {
-	ValidateKey(context.Context, cloudmigration.CloudMigration) error
-	MigrateData(context.Context, cloudmigration.CloudMigration, cloudmigration.MigrateDataRequestDTO) (*cloudmigration.MigrateDataResponseDTO, error)
-}
-
-const logPrefix = "cloudmigration.cmsclient"
-
+// NewCMSClient returns an implementation of Client that queries CloudMigrationService
 func NewCMSClient(domain string) Client {
-	return &clientImpl{
+	return &cmsClientImpl{
 		domain: domain,
 		log:    log.New(logPrefix),
 	}
 }
 
-type clientImpl struct {
+type cmsClientImpl struct {
 	domain string
 	log    *log.ConcreteLogger
 }
 
-func (c *clientImpl) ValidateKey(ctx context.Context, cm cloudmigration.CloudMigration) error {
+func (c *cmsClientImpl) ValidateKey(ctx context.Context, cm cloudmigration.CloudMigration) error {
 	logger := c.log.FromContext(ctx)
 
 	path := fmt.Sprintf("https://cms-%s.%s/cloud-migrations/api/v1/validate-key", cm.ClusterSlug, c.domain)
@@ -69,7 +63,7 @@ func (c *clientImpl) ValidateKey(ctx context.Context, cm cloudmigration.CloudMig
 	return nil
 }
 
-func (c *clientImpl) MigrateData(ctx context.Context, cm cloudmigration.CloudMigration, request cloudmigration.MigrateDataRequestDTO) (*cloudmigration.MigrateDataResponseDTO, error) {
+func (c *cmsClientImpl) MigrateData(ctx context.Context, cm cloudmigration.CloudMigration, request cloudmigration.MigrateDataRequestDTO) (*cloudmigration.MigrateDataResponseDTO, error) {
 	logger := c.log.FromContext(ctx)
 
 	path := fmt.Sprintf("https://cms-%s.%s/cloud-migrations/api/v1/migrate-data", cm.ClusterSlug, c.domain)

pkg/services/cloudmigration/cmsclient/inmemory_client.go

@@ -0,0 +1,48 @@
+package cmsclient
+
+import (
+	"context"
+	"math/rand"
+
+	"github.com/grafana/grafana/pkg/services/cloudmigration"
+)
+
+// NewInMemoryClient returns an implementation of Client that returns canned responses
+func NewInMemoryClient() Client {
+	return &memoryClientImpl{}
+}
+
+type memoryClientImpl struct{}
+
+func (c *memoryClientImpl) ValidateKey(ctx context.Context, cm cloudmigration.CloudMigration) error {
+	// return ErrMigrationNotDeleted
+	return nil
+}
+
+func (c *memoryClientImpl) MigrateData(
+	ctx context.Context,
+	cm cloudmigration.CloudMigration,
+	request cloudmigration.MigrateDataRequestDTO,
+) (*cloudmigration.MigrateDataResponseDTO, error) {
+	//return nil, ErrMigrationNotDeleted
+
+	result := cloudmigration.MigrateDataResponseDTO{
+		Items: make([]cloudmigration.MigrateDataResponseItemDTO, len(request.Items)),
+	}
+
+	for i, v := range request.Items {
+		result.Items[i] = cloudmigration.MigrateDataResponseItemDTO{
+			Type:   v.Type,
+			RefID:  v.RefID,
+			Status: cloudmigration.ItemStatusOK,
+		}
+	}
+
+	// simulate flakiness on one random item
+	i := rand.Intn(len(result.Items))
+	failedItem := result.Items[i]
+	failedItem.Status, failedItem.Error = cloudmigration.ItemStatusError, "simulated random error"
+	result.Items[i] = failedItem
+
+	return &result, nil
+}