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errors.go
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errors.go
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// Copyright © 2022 Cisco Systems, Inc. and its affiliates.
// All rights reserved.
//
// 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 utils
type (
singleWrappedError = interface{ Unwrap() error }
multiWrappedError = interface{ Unwrap() []error }
)
// UnwrapErrors returns a slice of errors by unwrapping err error.
// Returned slice is nil if err is nil.
// Slice with the original err as a single element is returned if err does not implement `Unwrap() error`
// or `Unwrap []error` interfaces.
// UnwrapErrors does not perform recursive lookup, so only the top level err is unwrapped.
func UnwrapErrors(err error) []error {
if err == nil {
return nil
}
errs := make([]error, 0)
// nolint:errorlint
switch e := err.(type) {
case singleWrappedError:
if u := e.Unwrap(); u != nil {
errs = append(errs, u)
}
case multiWrappedError:
if u := e.Unwrap(); u != nil {
errs = append(errs, u...)
}
default:
errs = append(errs, err)
}
return errs
}
// UnwrapErrorStrings returns a slice of error strings by unwrapping err error.
// Returned slice is nil if provider err is nil.
// Slice with the original err as a single element is returned if err does not implement `Unwrap() error`
// or `Unwrap []error` interfaces.
// UnwrapErrorStrings does not perform recursive lookup, so only the top level err is unwrapped.
func UnwrapErrorStrings(err error) []string {
if err == nil {
return nil
}
errs := make([]string, 0)
unwrappedErrs := UnwrapErrors(err)
for _, u := range unwrappedErrs {
errs = append(errs, u.Error())
}
return errs
}