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errors.go
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/
errors.go
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// Copyright 2022 Paul Greenberg greenpau@outlook.com
//
// 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 errors
import (
"errors"
"fmt"
)
// StandardError is a standard error.
type StandardError string
func (e StandardError) Error() string {
return string(e)
}
// WithArgs accepts errors with parameters.
func (e StandardError) WithArgs(v ...interface{}) error {
var hasErr, hasNil bool
for _, vv := range v {
switch err := vv.(type) {
case error:
if err == nil {
return nil
}
hasErr = true
case nil:
hasNil = true
}
}
if hasNil && !hasErr {
return nil
}
err := advErr{
err: fmt.Errorf("%w", e),
v: v,
}
return err
}
// advErr is an error with parameters.
type advErr struct {
err error
v []interface{}
}
// Error returns error string.
func (e advErr) Error() string {
return fmt.Sprintf(e.err.Error(), e.v...)
}
// Unwrap returns unwrapped error.
func (e advErr) Unwrap() error {
return errors.Unwrap(e.err)
}