/
errors.go
115 lines (95 loc) · 2.44 KB
/
errors.go
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// Copyright 2018-2022 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 protocol
import (
"errors"
"fmt"
"strings"
"sync"
"github.com/tidwall/redcon"
)
var ErrInvalidArgument = errors.New("invalid argument")
var GenericError = "ERR"
var errorWithPrefix = struct {
mtx sync.RWMutex
prefix map[string]error
err map[error]string
}{
prefix: make(map[string]error),
err: make(map[error]string),
}
func init() {
SetError("INVALIDARGUMENT", ErrInvalidArgument)
}
func SetError(prefix string, err error) {
errorWithPrefix.mtx.Lock()
defer errorWithPrefix.mtx.Unlock()
e, ok := errorWithPrefix.prefix[prefix]
if ok && e != err {
panic(fmt.Sprintf("prefix collision: %s: %v != %v", prefix, err, e))
}
errorWithPrefix.err[err] = prefix
errorWithPrefix.prefix[prefix] = err
}
func GetError(prefix string) error {
errorWithPrefix.mtx.RLock()
defer errorWithPrefix.mtx.RUnlock()
return errorWithPrefix.prefix[prefix]
}
func getPrefix(err error) string {
prefix, ok := errorWithPrefix.err[err]
if !ok {
return GenericError
}
return prefix
}
func GetPrefix(err error) string {
errorWithPrefix.mtx.RLock()
defer errorWithPrefix.mtx.RUnlock()
prefix := getPrefix(err)
if prefix == GenericError {
return getPrefix(errors.Unwrap(err))
}
return prefix
}
func ConvertError(err error) error {
if err == nil {
return nil
}
parsed := strings.SplitN(err.Error(), " ", 2)
if perr := GetError(parsed[0]); perr != nil {
return perr
}
if len(parsed) > 1 {
return fmt.Errorf("%s", parsed[1])
}
return err
}
func WriteError(conn redcon.Conn, err error) {
prefix := GetPrefix(err)
conn.WriteError(fmt.Sprintf("%s %s", prefix, err.Error()))
}
func errWrongNumber(args [][]byte) error {
sb := strings.Builder{}
for {
arg := args[0]
sb.Write(arg)
args = args[1:]
if len(args) == 0 {
break
}
sb.WriteByte(0x20)
}
return fmt.Errorf("wrong number of arguments for '%s' command", strings.ToLower(sb.String()))
}