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// Copyright (c) 2021 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package multierr_test
import (
"fmt"
"log"
"os"
"path/filepath"
"go.uber.org/multierr"
)
func ExampleAppendInvoke() {
if err := run(); err != nil {
log.Fatal(err)
}
}
func run() (err error) {
dir, err := os.MkdirTemp("", "multierr")
// We create a temporary directory and defer its deletion when this
// function returns.
//
// If we failed to delete the temporary directory, we append its
// failure into the returned value with multierr.AppendInvoke.
//
// This uses a custom invoker that we implement below.
defer multierr.AppendInvoke(&err, RemoveAll(dir))
path := filepath.Join(dir, "example.txt")
f, err := os.Create(path)
if err != nil {
return err
}
// Similarly, we defer closing the open file when the function returns,
// and appends its failure, if any, into the returned error.
//
// This uses the multierr.Close invoker included in multierr.
defer multierr.AppendInvoke(&err, multierr.Close(f))
if _, err := fmt.Fprintln(f, "hello"); err != nil {
return err
}
return nil
}
// RemoveAll is a multierr.Invoker that deletes the provided directory and all
// of its contents.
type RemoveAll string
func (r RemoveAll) Invoke() error {
return os.RemoveAll(string(r))
}
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