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cleanup.go
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cleanup.go
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// Copyright (C) 2019 Google 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 app
import "context"
// Cleanup is a function that is invoked at a later time to perform the cleanup.
type Cleanup func(ctx context.Context)
// Then combines two clean up functions into a single cleanup function.
func (c Cleanup) Then(next Cleanup) Cleanup {
if c == nil {
return next
}
if next == nil {
return c
}
return func(ctx context.Context) {
c(ctx)
next(ctx)
}
}
// Invoke invokes the possibly nil cleanup safely. Returns a nil Cleanup, so
// this can be chained when invoking the cleanup as part of the error handling.
func (c Cleanup) Invoke(ctx context.Context) Cleanup {
if c != nil {
c(ctx)
}
return nil
}