62 lines
1.7 KiB
Go
62 lines
1.7 KiB
Go
// Copyright 2014 The Prometheus Authors
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package errcapture
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"io/ioutil"
|
|
"os"
|
|
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
)
|
|
|
|
type doFunc func() error
|
|
|
|
// Do runs function and on error return error by argument including the given error (usually
|
|
// from caller function).
|
|
func Do(err *error, doer doFunc, format string, a ...interface{}) {
|
|
derr := doer()
|
|
if err == nil || derr == nil {
|
|
return
|
|
}
|
|
|
|
// For os closers, it's a common case to double close.
|
|
// From reliability purpose this is not a problem it may only indicate surprising execution path.
|
|
if errors.Is(derr, os.ErrClosed) {
|
|
return
|
|
}
|
|
|
|
errs := prometheus.MultiError{}
|
|
errs.Append(*err)
|
|
errs.Append(fmt.Errorf(format+": %w", append(a, derr)...))
|
|
*err = errs
|
|
}
|
|
|
|
// ExhaustClose closes the io.ReadCloser with error capture but exhausts the reader before.
|
|
func ExhaustClose(err *error, r io.ReadCloser, format string, a ...interface{}) {
|
|
_, copyErr := io.Copy(ioutil.Discard, r)
|
|
|
|
Do(err, r.Close, format, a...)
|
|
if copyErr == nil {
|
|
return
|
|
}
|
|
|
|
errs := prometheus.MultiError{}
|
|
errs.Append(copyErr)
|
|
errs.Append(*err)
|
|
*err = errs
|
|
}
|