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neterrors.go
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neterrors.go
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// Copyright 2018-2021 Burak Sezer
//
// 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 neterrors
import (
"errors"
"fmt"
"sync"
"unsafe"
"github.com/buraksezer/olric/internal/protocol"
)
var (
mtx sync.Mutex
registryOnce sync.Once
registry map[protocol.StatusCode]error
)
// NetError defines a custom error type.
type NetError struct {
message string
statusCode protocol.StatusCode
}
func New(code protocol.StatusCode, message string) *NetError {
e := &NetError{
statusCode: code,
message: message,
}
registryOnce.Do(func() {
registry = make(map[protocol.StatusCode]error)
})
mtx.Lock()
defer mtx.Unlock()
_, ok := registry[code]
if ok {
panic(fmt.Sprintf("an error has already been registered with StatusCode: %d", code))
}
registry[code] = e
return e
}
func (e *NetError) Error() string {
return e.message
}
func (e *NetError) Bytes() []byte {
return *(*[]byte)(unsafe.Pointer(&e.message))
}
func (e *NetError) StatusCode() protocol.StatusCode {
return e.statusCode
}
// Wrap extends this error with an additional information.
func Wrap(err error, message interface{}) error {
return fmt.Errorf("%w: %v", err, message)
}
func Unwrap(err error) error {
return errors.Unwrap(err)
}
func GetByCode(code protocol.StatusCode) error {
if code == protocol.StatusOK {
return nil
}
err, ok := registry[code]
if !ok {
return fmt.Errorf("no error found with StatusCode: %d", code)
}
return err
}
func toByte(err interface{}) []byte {
switch val := err.(type) {
case string:
return []byte(val)
case error:
return []byte(val.Error())
default:
return nil
}
}
func ErrorResponse(w protocol.EncodeDecoder, msg interface{}) {
netErr, ok := msg.(*NetError)
if ok {
w.SetValue(netErr.Bytes())
w.SetStatus(netErr.StatusCode())
return
}
err, ok := msg.(error)
if !ok {
w.SetValue(toByte(msg))
w.SetStatus(protocol.StatusErrInternalFailure)
return
}
var tmp error
for {
tmp = Unwrap(err)
if tmp == nil {
break
}
err = tmp
}
netErr, ok = err.(*NetError)
if !ok {
w.SetValue(toByte(msg))
w.SetStatus(protocol.StatusErrInternalFailure)
return
}
w.SetValue(toByte(msg))
w.SetStatus(netErr.StatusCode())
}