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