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78 lines
1.8 KiB
78 lines
1.8 KiB
// Copyright 2019 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by aprettyPrintlicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package logutil
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import (
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"bytes"
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"encoding/hex"
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"fmt"
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"io"
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"reflect"
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"strings"
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"github.com/golang/protobuf/proto"
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)
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// Hex defines a fmt.Stringer for proto.Message.
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// We can't define the String() method on proto.Message, but we can wrap it.
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func Hex(msg proto.Message) fmt.Stringer {
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return hexStringer{msg}
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}
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type hexStringer struct {
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proto.Message
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}
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func (h hexStringer) String() string {
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val := reflect.ValueOf(h.Message)
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var w bytes.Buffer
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prettyPrint(&w, val)
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return w.String()
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}
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func prettyPrint(w io.Writer, val reflect.Value) {
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tp := val.Type()
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switch val.Kind() {
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case reflect.Slice:
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elemType := tp.Elem()
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if elemType.Kind() == reflect.Uint8 {
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fmt.Fprintf(w, "%s", hex.EncodeToString(val.Bytes()))
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} else {
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fmt.Fprintf(w, "%s", val.Interface())
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}
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case reflect.Struct:
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fmt.Fprintf(w, "{")
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for i := 0; i < val.NumField(); i++ {
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fv := val.Field(i)
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ft := tp.Field(i)
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if strings.HasPrefix(ft.Name, "XXX_") {
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continue
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}
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if i != 0 {
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fmt.Fprintf(w, " ")
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}
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fmt.Fprintf(w, "%s:", ft.Name)
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prettyPrint(w, fv)
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}
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fmt.Fprintf(w, "}")
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case reflect.Ptr:
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if val.IsNil() {
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fmt.Fprintf(w, "%v", val.Interface())
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} else {
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prettyPrint(w, reflect.Indirect(val))
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}
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default:
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fmt.Fprintf(w, "%v", val.Interface())
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}
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}
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