msgpack-microscope

A library and tool to analyze MessagePack.

Installation

$ go get github.com/nokute78/msgpack-microscope/pkg/msgpack

Usage

package main

import (
	"bytes"
	"fmt"
	"github.com/nokute78/msgpack-microscope/pkg/msgpack"
	"os"
)

func showMsgPack(obj *msgpack.MPObject) {
	fmt.Fprintf(os.Stdout, "%s\n", obj)

	if msgpack.IsMap(obj.FirstByte) || msgpack.IsArray(obj.FirstByte) {
		for _, v := range obj.Child {
			showMsgPack(v)
		}
	}
}

func main() {
	/* {"compact":true,"schema":0} in JSON */
	msgp := []byte{0x82, 0xa7, 0x63, 0x6f, 0x6d, 0x70, 0x61, 0x63, 0x74, 0xc3, 0xa6, 0x73, 0x63, 0x68, 0x65, 0x6d, 0x61, 0x00}

	ret, err := msgpack.Decode(bytes.NewBuffer(msgp))
	if err != nil {
		os.Exit(-1)
	}
	showMsgPack(ret)
}

Ouput :

fixmap(0x82): length=2
fixstr(0xa7): val="compact"
true(0xc3): val=true
fixstr(0xa6): val="schema"
positive fixint(0x00): val=0

Tool

• msgpack2json

A tool to analyze MessagePack. It is inspired by msgpack-inspect.

$ printf "\x82\xa7compact\xc3\xa6schema\x00" | ./msgpack2json
{"format":"fixmap", "header":"0x82", "length":2, "raw":"0x82a7636f6d70616374c3a6736368656d6100", "value":
    [
        {"key":
            {"format":"fixstr", "header":"0xa7", "raw":"0xa7636f6d70616374", "value":"compact"},
         "value":
            {"format":"true", "header":"0xc3", "raw":"0xc3", "value":true}
        },
        {"key":
            {"format":"fixstr", "header":"0xa6", "raw":"0xa6736368656d61", "value":"schema"},
         "value":
            {"format":"positive fixint", "header":"0x00", "raw":"0x00", "value":0}
        }
    ]
}

License

Apache License v2.0