| // 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" |
| "io/ioutil" |
| "log" |
| "os" |
| "path/filepath" |
| |
| "go.uber.org/multierr" |
| ) |
| |
| func ExampleAppendInvoke() { |
| if err := run(); err != nil { |
| log.Fatal(err) |
| } |
| } |
| |
| func run() (err error) { |
| dir, err := ioutil.TempDir("", "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)) |
| } |