tidb hex 源码
tidb hex 代码
文件路径：/util/logutil/hex.go
// Copyright 2019 PingCAP, Inc.
//
// 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 logutil
import (
"bytes"
"encoding/hex"
"fmt"
"io"
"reflect"
"strings"
"github.com/golang/protobuf/proto"
)
// Hex defines a fmt.Stringer for proto.Message.
// We can't define the String() method on proto.Message, but we can wrap it.
func Hex(msg proto.Message) fmt.Stringer {
return hexStringer{msg}
}
type hexStringer struct {
proto.Message
}
func (h hexStringer) String() string {
val := reflect.ValueOf(h.Message)
var w bytes.Buffer
prettyPrint(&w, val)
return w.String()
}
func prettyPrint(w io.Writer, val reflect.Value) {
tp := val.Type()
switch val.Kind() {
case reflect.Slice:
elemType := tp.Elem()
if elemType.Kind() == reflect.Uint8 {
fmt.Fprintf(w, "%s", hex.EncodeToString(val.Bytes()))
} else {
fmt.Fprintf(w, "%s", val.Interface())
}
case reflect.Struct:
fmt.Fprintf(w, "{")
for i := 0; i < val.NumField(); i++ {
fv := val.Field(i)
ft := tp.Field(i)
if strings.HasPrefix(ft.Name, "XXX") {
continue
}
if i != 0 {
fmt.Fprintf(w, " ")
}
fmt.Fprintf(w, "%s:", ft.Name)
prettyPrint(w, fv)
}
fmt.Fprintf(w, "}")
case reflect.Ptr:
if val.IsNil() {
fmt.Fprintf(w, "%v", val.Interface())
} else {
prettyPrint(w, reflect.Indirect(val))
}
default:
fmt.Fprintf(w, "%v", val.Interface())
}
}
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