fix ns login after drop data

edgraph/server.go

@@ -377,6 +377,7 @@ func (s *Server) Alter(ctx context.Context, op *api.Operation) (*api.Payload, er
 	defer span.End()
 
 	ctx = x.AttachJWTNamespace(ctx)
+
 	span.Annotatef(nil, "Alter operation: %+v", op)
 
 	// Always print out Alter operations because they are important and rare.
@@ -458,8 +459,9 @@ func (s *Server) Alter(ctx context.Context, op *api.Operation) (*api.Payload, er
 
 		// just reinsert the GraphQL schema, no need to alter dgraph schema as this was drop_data
 		_, err = UpdateGQLSchema(ctx, graphQLSchema, "")
-		// recreate the admin account after a drop data operation
-		InitializeAcl(nil)
+
+		// Since all data has been dropped, we need to recreate the admin account in the respective namespace.
+		upsertGuardianAndGroot(nil, namespace)
 		return empty, err
 	}
 

systest/multi-tenancy/login_test.go

@@ -0,0 +1,123 @@
+//go:build integration
+// +build integration
+
+/*
+ * Copyright 2024 Dgraph Labs, Inc. and Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package main
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/dgraph-io/dgo/v240/protos/api"
+	"github.com/dgraph-io/dgraph/v24/dgraphapi"
+	"github.com/dgraph-io/dgraph/v24/x"
+)
+
+func addData(t *testing.T, gc *dgraphapi.GrpcClient) {
+	require.NoError(t, gc.SetupSchema(`name: string  .`))
+
+	rdfs := `
+	_:a <name> "alice" .
+	_:b <name> "bob" .
+	_:c <name> "sagar" .
+	_:d <name> "ajay" .`
+	_, err := gc.Mutate(&api.Mutation{SetNquads: []byte(rdfs), CommitNow: true})
+	require.NoError(t, err)
+}
+
+func (msuite *MultitenancyTestSuite) TestLoggingIntoTheNSAfterDropDataFromTheNS() {
+	t := msuite.T()
+	gc, cleanup, err := msuite.dc.Client()
+	require.NoError(t, err)
+	defer cleanup()
+
+	hc, err := msuite.dc.HTTPClient()
+	require.NoError(t, err)
+
+	require.NoError(t, gc.LoginIntoNamespace(context.Background(),
+		dgraphapi.DefaultUser, dgraphapi.DefaultPassword, x.GalaxyNamespace))
+	require.NoError(t, gc.DropAll())
+
+	require.NoError(t, hc.LoginIntoNamespace(dgraphapi.DefaultUser, dgraphapi.DefaultPassword, x.GalaxyNamespace))
+	for i := 1; i < 5; i++ {
+		ns, err := hc.AddNamespace()
+		require.NoError(t, err)
+		require.NoError(t, gc.LoginIntoNamespace(context.Background(), dgraphapi.DefaultUser, dgraphapi.DefaultPassword, ns))
+
+		addData(t, gc)
+
+		// Drop data from the namespace
+		require.NoError(t, gc.Alter(context.Background(), &api.Operation{DropOp: api.Operation_DATA}))
+
+		// Login into the namespace
+		require.NoError(t, gc.LoginIntoNamespace(context.Background(),
+			dgraphapi.DefaultUser, dgraphapi.DefaultPassword, ns))
+	}
+}
+
+func (msuite *MultitenancyTestSuite) TestLoggingIntoAllNamespacesAfterDropDataOperationFromDefaultNs() {
+	t := msuite.T()
+	gc, cleanup, err := msuite.dc.Client()
+	require.NoError(t, err)
+	defer cleanup()
+
+	hc, err := msuite.dc.HTTPClient()
+	require.NoError(t, err)
+
+	require.NoError(t, gc.LoginIntoNamespace(context.Background(),
+		dgraphapi.DefaultUser, dgraphapi.DefaultPassword, x.GalaxyNamespace))
+
+	require.NoError(t, gc.DropAll())
+	require.NoError(t, hc.LoginIntoNamespace(dgraphapi.DefaultUser, dgraphapi.DefaultPassword, x.GalaxyNamespace))
+
+	nss := []uint64{}
+	for i := 1; i <= 2; i++ {
+		ns, err := hc.AddNamespace()
+		require.NoError(t, err)
+		nss = append(nss, ns)
+		require.NoError(t, gc.LoginIntoNamespace(context.Background(),
+			dgraphapi.DefaultUser, dgraphapi.DefaultPassword, ns))
+
+		addData(t, gc)
+	}
+
+	// Drop data from default namespace
+	require.NoError(t, gc.LoginIntoNamespace(context.Background(),
+		dgraphapi.DefaultUser, dgraphapi.DefaultPassword, x.GalaxyNamespace))
+
+	require.NoError(t, gc.Alter(context.Background(), &api.Operation{DropOp: api.Operation_DATA}))
+
+	// verify here that login into the namespace should not fail
+	require.NoError(t, gc.LoginIntoNamespace(context.Background(),
+		dgraphapi.DefaultUser, dgraphapi.DefaultPassword, x.GalaxyNamespace))
+
+	for _, ns := range nss {
+		require.NoError(t, gc.LoginIntoNamespace(context.Background(),
+			dgraphapi.DefaultUser, dgraphapi.DefaultPassword, ns))
+		query := `{
+			q(func: has(name)) {
+			count(uid)			
+			}
+		}`
+		resp, err := gc.Query(query)
+		require.NoError(t, err)
+		require.Contains(t, string(resp.Json), `"count":4`)
+	}
+}