json_unmarshalling.go

package main

import (
	"encoding/json"
	"fmt"
)

type Response struct {
	Action string
	Node Nodes
}

type Nodes struct {
	Key string
	Dir bool
	Nodes []Node
	ModifiedIndex int64
	CreatedIndex int64
}

type Node struct {
	Key string
	Value string
	ModifiedIndex int64
	CreatedIndex int64
}

type TNode struct {
	Nodes
}


func main() {
	//js := []byte(`{"nodes": [{"key":"/announce/services/kcmongod/arbiter","value":"172.31.29.189","modifiedIndex":8782649,"createdIndex":8782649}]}`)
	//js := []byte(`{"key":"/announce/services/kcmongod","dir":true,"nodes":[{"key":"/announce/services/kcmongod/arbiter","value":"172.31.29.189","modifiedIndex":8782649,"createdIndex":8782649},{"key":"/announce/services/kcmongod/1","value":"172.31.15.203","modifiedIndex":8782670,"createdIndex":8782670},{"key":"/announce/services/kcmongod/2","value":"172.31.44.174","modifiedIndex":8813322,"createdIndex":8813322}],"modifiedIndex":5198946,"createdIndex":5198946}`)
	
	js := []byte(`{"action":"get","node":{"key":"/announce/services/kcmongod","dir":true,"nodes":[{"key":"/announce/services/kcmongod/arbiter","value":"172.31.29.189","modifiedIndex":8782649,"createdIndex":8782649},{"key":"/announce/services/kcmongod/1","value":"172.31.15.203","modifiedIndex":8782670,"createdIndex":8782670},{"key":"/announce/services/kcmongod/2","value":"172.31.44.174","modifiedIndex":8813322,"createdIndex":8813322}],"modifiedIndex":5198946,"createdIndex":5198946}}`)
	//js := []byte(`{"SortAs": "SGML","GlossTerm": "Standard Generalized Markup Language", "Acronym": "SGML","Abbrev": "ISO 8879:1986", "Test": {"New": 3}}`)


	// Using map to unmarshal the json. Useful if you are interested only some parts of the json.
	var objmap map[string]*json.RawMessage
	
	if err := json.Unmarshal(js, &objmap); err != nil {
		panic(err)
	}
	
	var allNodes Nodes
	json.Unmarshal(*objmap["node"], &allNodes)
	fmt.Println("All Nodes, Map based unmarshaling: ", allNodes)
	
	
	
	// Conventional unmarshaling using proper data structures.
	var nodes Response
	json.Unmarshal(js, &nodes)
	for _, node := range nodes.Node.Nodes {
		fmt.Println(node.Value)
	}
}