// Copyright 2016-2018, Pulumi Corporation. // // 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 deploy import ( "context" "github.com/pulumi/pulumi/sdk/v3/go/common/tokens" "github.com/pulumi/pulumi/sdk/v3/go/common/util/contract" ) // NullSource is a source that never returns any resources. This may be used in scenarios where the "new" // version of the world is meant to be empty, either for testing purposes, or removal of an existing stack. func NewNullSource(project tokens.PackageName) Source { return &nullSource{project: project} } // A nullSource never returns any resources. type nullSource struct { project tokens.PackageName } // Deprecated: A NullSource with no project name. var NullSource Source = &nullSource{} func (src *nullSource) Close() error { return nil } func (src *nullSource) Project() tokens.PackageName { return src.project } func (src *nullSource) Info() interface{} { return nil } func (src *nullSource) Iterate(ctx context.Context, providers ProviderSource) (SourceIterator, error) { contract.Ignore(ctx) return &nullSourceIterator{}, nil } // nullSourceIterator always returns nil, nil in response to Next, indicating that it is done. type nullSourceIterator struct{} func (iter *nullSourceIterator) Close() error { return nil // nothing to do. } func (iter *nullSourceIterator) Next() (SourceEvent, error) { return nil, nil // means "done" }