106 lines
2.3 KiB
Go
106 lines
2.3 KiB
Go
// Copyright 2019 The Cockroach Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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// implied. See the License for the specific language governing
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// permissions and limitations under the License.
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package join
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import (
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"context"
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"fmt"
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"github.com/cockroachdb/errors/errbase"
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"github.com/cockroachdb/redact"
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"github.com/gogo/protobuf/proto"
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)
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// Join returns an error that wraps the given errors.
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// Any nil error values are discarded.
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// Join returns nil if errs contains no non-nil values.
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// The error formats as the concatenation of the strings obtained
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// by calling the Error method of each element of errs, with a newline
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// between each string.
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func Join(errs ...error) error {
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n := 0
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for _, err := range errs {
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if err != nil {
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n++
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}
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}
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if n == 0 {
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return nil
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}
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e := &joinError{
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errs: make([]error, 0, n),
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}
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for _, err := range errs {
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if err != nil {
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e.errs = append(e.errs, err)
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}
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}
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return e
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}
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type joinError struct {
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errs []error
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}
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var _ error = (*joinError)(nil)
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var _ fmt.Formatter = (*joinError)(nil)
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var _ errbase.SafeFormatter = (*joinError)(nil)
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func (e *joinError) Error() string {
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return redact.Sprint(e).StripMarkers()
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}
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func (e *joinError) Unwrap() []error {
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return e.errs
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}
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func (e *joinError) SafeFormatError(p errbase.Printer) error {
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for i, err := range e.errs {
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if i > 0 {
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p.Print("\n")
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}
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p.Print(err)
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}
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return nil
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}
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func (e *joinError) Format(s fmt.State, verb rune) {
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errbase.FormatError(e, s, verb)
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}
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func init() {
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errbase.RegisterMultiCauseEncoder(
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errbase.GetTypeKey(&joinError{}),
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func(
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ctx context.Context,
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err error,
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) (msg string, safeDetails []string, payload proto.Message) {
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return "", nil, nil
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},
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)
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errbase.RegisterMultiCauseDecoder(
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errbase.GetTypeKey(&joinError{}),
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func(
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ctx context.Context,
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causes []error,
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msgPrefix string,
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safeDetails []string,
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payload proto.Message,
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) error {
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return Join(causes...)
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},
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)
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}
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