125 lines
2.9 KiB
Go
125 lines
2.9 KiB
Go
// Copyright (c) 2017-2021 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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"errors"
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"fmt"
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"io"
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"go.uber.org/multierr"
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)
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func ExampleCombine() {
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err := multierr.Combine(
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errors.New("call 1 failed"),
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nil, // successful request
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errors.New("call 3 failed"),
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nil, // successful request
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errors.New("call 5 failed"),
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)
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fmt.Printf("%+v", err)
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// Output:
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// the following errors occurred:
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// - call 1 failed
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// - call 3 failed
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// - call 5 failed
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}
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func ExampleAppend() {
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var err error
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err = multierr.Append(err, errors.New("call 1 failed"))
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err = multierr.Append(err, errors.New("call 2 failed"))
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fmt.Println(err)
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// Output:
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// call 1 failed; call 2 failed
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}
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func ExampleErrors() {
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err := multierr.Combine(
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nil, // successful request
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errors.New("call 2 failed"),
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errors.New("call 3 failed"),
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)
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err = multierr.Append(err, nil) // successful request
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err = multierr.Append(err, errors.New("call 5 failed"))
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errors := multierr.Errors(err)
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for _, err := range errors {
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fmt.Println(err)
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}
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// Output:
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// call 2 failed
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// call 3 failed
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// call 5 failed
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}
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func ExampleAppendInto() {
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var err error
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if multierr.AppendInto(&err, errors.New("foo")) {
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fmt.Println("call 1 failed")
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}
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if multierr.AppendInto(&err, nil) {
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fmt.Println("call 2 failed")
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}
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if multierr.AppendInto(&err, errors.New("baz")) {
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fmt.Println("call 3 failed")
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}
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fmt.Println(err)
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// Output:
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// call 1 failed
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// call 3 failed
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// foo; baz
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}
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type fakeCloser func() error
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func (f fakeCloser) Close() error {
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return f()
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}
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func FakeCloser(err error) io.Closer {
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return fakeCloser(func() error {
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return err
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})
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}
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func ExampleClose() {
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var err error
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closer := FakeCloser(errors.New("foo"))
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defer func() {
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fmt.Println(err)
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}()
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defer multierr.AppendInvoke(&err, multierr.Close(closer))
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fmt.Println("Hello, World")
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// Output:
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// Hello, World
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// foo
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}
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