nested map

README.md

お題

こういうデータを処理して

eth0
  link/ether 00:00:00:00:00:00
  inet 192.168.0.1 brd 192.168.0.255
eth1
  link/ether 11:11:11:11:11:11
  inet 192.168.1.1 brd 192.168.1.255

こういう構造のmap的なものに格納したい。

{
  "network": {
    "interfaces": {
      "eth0": {
        "addresses": {
          "00:00:00:00:00:00": {
            "family": "lladdr"
          },
          "192.168.0.1": {
            "broadcast": "192.168.0.255",
            "family": "inet"
          }
        }
      },
      "eth1": {
        "addresses": {
          "11:11:11:11:11:11": {
            "family": "lladdr"
          },
          "192.168.1.1": {
            "broadcast": "192.168.1.255",
            "family": "inet"
          }
        }
      }
    }
  }
}

イメージ

package main

import (
	"fmt"

	simplejson "github.com/bitly/go-simplejson"
)

func main() {
	data := []string{
		"eth0",
		"  link/ether 00:00:00:00:00:00",
		"  inet 192.168.0.1 brd 192.168.0.255",
		"eth1",
		"  link/ether 11:11:11:11:11:11",
		"  inet 192.168.1.1 brd 192.168.1.255",
	}

	network := ...
	// がんばる！

	sj := simplejson.New()
	sj.Set("network", network)
	json, _ := sj.EncodePretty()
	fmt.Printf("%s\n", string(json))
}

sample-objects.go

// @hirose31
// objects を使ってみた。
package main

import (
	"fmt"
	"regexp"

	simplejson "github.com/bitly/go-simplejson"
	"github.com/stretchr/stew/objects"
)

func main() {
	data := []string{
		"eth0",
		"  link/ether 00:00:00:00:00:00",
		"  inet 192.168.0.1 brd 192.168.0.255",
		"eth1",
		"  link/ether 11:11:11:11:11:11",
		"  inet 192.168.1.1 brd 192.168.1.255",
	}

	objects.PathSeparator = "/"
	network := objects.M(
		"interfaces", objects.M(),
	)

	ifname := ""
	splitter := regexp.MustCompile(`\s+`)

	for _, line := range data {
		e := splitter.Split(line, -1)
		if e[0] != "" {
			ifname = e[0]
		} else if e[1] == "link/ether" {
			addr := e[2]
			keypath := fmt.Sprintf("interfaces/%s/addresses/%s", ifname, addr)

			network.Set(keypath, objects.M(
				"family", "lladdr",
			))
		} else if e[1] == "inet" {
			addr := e[2]
			keypath := fmt.Sprintf("interfaces/%s/addresses/%s", ifname, addr)
			brd := ""
			for i, v := range e {
				if v == "brd" {
					brd = e[i+1]
				}
			}

			network.Set(keypath, objects.M(
				"family", "inet",
				"broadcast", brd,
			))
		}
	}

	sj := simplejson.New()
	sj.Set("network", network)
	json, _ := sj.EncodePretty()
	fmt.Printf("%s\n", string(json))
}