Fix Azure Managed SQL fetcher available definition (#19746)

lib/srv/discovery/fetchers/db/azure_managed_sql.go

@@ -54,7 +54,7 @@ func (f *azureManagedSQLServerFetcher) NewDatabaseFromServer(server *armsql.Mana
 
 	database, err := services.NewDatabaseFromAzureManagedSQLServer(server)
 	if err != nil {
-		log.Warnf("Could not convert Azure SQL server %q to database resource: %v.", azure.StringVal(server.Name), err)
+		log.Warnf("Could not convert Azure Managed SQL server %q to database resource: %v.", azure.StringVal(server.Name), err)
 		return nil
 	}
 
@@ -76,12 +76,12 @@ func (f *azureManagedSQLServerFetcher) isAvailable(server *armsql.ManagedInstanc
 		armsql.ManagedInstancePropertiesProvisioningStateRegistering,
 		armsql.ManagedInstancePropertiesProvisioningStateUnknown,
 		armsql.ManagedInstancePropertiesProvisioningStateUnrecognized:
-		return true
+		return false
 	case armsql.ManagedInstancePropertiesProvisioningStateCreated,
 		armsql.ManagedInstancePropertiesProvisioningStateRunning,
 		armsql.ManagedInstancePropertiesProvisioningStateSucceeded,
 		armsql.ManagedInstancePropertiesProvisioningStateUpdating:
-		return false
+		return true
 	default:
 		logrus.Warnf("Unknown status type: %q. Assuming Managed SQL Server %q is available.",
 			azure.StringVal(server.Properties.ProvisioningState),

lib/srv/discovery/fetchers/db/azure_managed_sql_test.go

@@ -0,0 +1,85 @@
+// Copyright 2022 Gravitational, Inc
+//
+// 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 db
+
+import (
+	"testing"
+
+	"github.com/Azure/azure-sdk-for-go/sdk/azcore/to"
+	"github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/sql/armsql"
+	"github.com/stretchr/testify/require"
+	"golang.org/x/exp/slices"
+
+	"github.com/gravitational/teleport/lib/utils"
+)
+
+func TestSQLManagedServerFetcher(t *testing.T) {
+	logger := utils.NewLoggerForTests()
+	fetcher := &azureManagedSQLServerFetcher{}
+
+	t.Run("NewDatabaseFromServer", func(t *testing.T) {
+		// List of provisioning states that are used to identify a database is
+		// available and can be discovered.
+		availableStates := []armsql.ManagedInstancePropertiesProvisioningState{
+			armsql.ManagedInstancePropertiesProvisioningStateCreated,
+			armsql.ManagedInstancePropertiesProvisioningStateRunning,
+			armsql.ManagedInstancePropertiesProvisioningStateSucceeded,
+			armsql.ManagedInstancePropertiesProvisioningStateUpdating,
+		}
+
+		// For available states, it should return a parsed database.
+		for _, state := range availableStates {
+			t.Run(string(state), func(t *testing.T) {
+				require.NotNil(t, fetcher.NewDatabaseFromServer(makeManagedSQLInstance(state), logger), "expected to have a database, but got nil")
+			})
+		}
+
+		// The remaining possible states should not return a database.
+		for _, state := range armsql.PossibleManagedInstancePropertiesProvisioningStateValues() {
+			// Skip if the state was already tested.
+			if slices.Contains(availableStates, state) {
+				continue
+			}
+
+			t.Run(string(state), func(t *testing.T) {
+				require.Nil(t, fetcher.NewDatabaseFromServer(makeManagedSQLInstance(state), logger), "expected to have nil, but got a database")
+			})
+		}
+
+		t.Run("RandomState", func(t *testing.T) {
+			require.NotNil(t,
+				fetcher.NewDatabaseFromServer(
+					makeManagedSQLInstance("RandomState"),
+					logger,
+				),
+				"expected to have a database, but got nil",
+			)
+		})
+	})
+}
+
+// makeManagedSQLInstances returns a ManagedInstance struct with the provided
+// provisioning state.
+func makeManagedSQLInstance(state armsql.ManagedInstancePropertiesProvisioningState) *armsql.ManagedInstance {
+	return &armsql.ManagedInstance{
+		ID:       to.Ptr("/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/my-resource-groupd/providers/Microsoft.Sql/servers/sqlserver"),
+		Name:     to.Ptr("sqlserver"),
+		Location: to.Ptr("westus"),
+		Properties: &armsql.ManagedInstanceProperties{
+			FullyQualifiedDomainName: to.Ptr("sqlserver.database.windows.net"),
+			ProvisioningState:        to.Ptr(state),
+		},
+	}
+}