parsing graphite with go

gistfile1.go

package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
)

type GraphiteResult struct {
	Target     string          `json:"target"`
	Datapoints [][]interface{} `json:"datapoints"`
}

type Datapoint struct {
	Epoch int
	Value float64
}

type TranslatedResult struct {
	Target     string
	Datapoints []Datapoint
}

func main() {
	res, err := http.Get("http://graphite:8000/render/?target=some_metric&format=json&from=-5min")
	if err != nil {
		log.Fatal(err)
	}
	defer res.Body.Close()

	body, err := ioutil.ReadAll(res.Body)
	if err != nil {
		log.Fatal(err)
	}

	var data []GraphiteResult
	err = json.Unmarshal(body, &data)
	if err != nil {
		log.Fatal(err)
	}

	for _, r := range data {
		newResult := TranslatedResult{Target: r.Target, Datapoints: make([]Datapoint, 0)}
		for _, d := range r.Datapoints {
			p := Datapoint{}
			p.Epoch = int(d[1].(float64))
			// this could be nil!
			p.Value = d[0].(float64)
			newResult.Datapoints = append(newResult.Datapoints, p)
		}
		fmt.Println(newResult)
	}
}