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