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@lieuwex
Last active Jul 9, 2018
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package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"math"
"net/http"
"os"
"strings"
"time"
)
type weatherInfo struct {
fullDay bool
Start float64 `json:"start"`
Precip []float64 `json:"precip"`
Raw []float64 `json:"raw"`
}
func (info weatherInfo) getAmount() []float64 {
var result []float64
if info.fullDay {
for _, val := range info.Raw {
result = append(result, val)
}
} else {
for _, val := range info.Precip {
val = math.Pow(10, float64((val-109)/32))
result = append(result, val)
}
}
if len(result) > 25 {
result = result[:25]
}
return result
}
func parseString(s string) weatherInfo {
x := strings.Split(s, " ")
raw := strings.Replace(x[len(x)-1], ";", "", -1)
var data weatherInfo
err := json.Unmarshal([]byte(raw), &data)
if err != nil {
fmt.Println("Couldn't parse JSON. ")
panic(err)
}
return data
}
func printUsage() {
fmt.Fprintf(os.Stderr, "usage: %s [-24] <location>\n", os.Args[0])
os.Exit(1)
}
func main() {
if len(os.Args) < 2 {
printUsage()
}
var location string
fullDay := false
if len(os.Args) == 2 {
location = os.Args[1]
} else if len(os.Args) == 3 {
switch os.Args[1] {
case "-2":
fullDay = false
case "-24":
fullDay = true
default:
printUsage()
}
location = os.Args[2]
}
resp, err := http.Get("http://www.buienalarm.nl/location/" + location)
if err != nil {
fmt.Println("Couldn't retrieve forecast data from Buienalarm. ")
panic(err)
}
defer resp.Body.Close()
matchString := "locationdata['forecast']"
timeInterval := 5 * time.Minute
if fullDay {
matchString = "var precip_daily"
timeInterval = time.Hour
}
body, _ := ioutil.ReadAll(resp.Body)
for _, line := range strings.Split(string(body), "\n") {
if strings.Contains(line, matchString) {
data := parseString(line)
data.fullDay = fullDay
t := time.Unix(int64(data.Start), 0)
for _, val := range data.getAmount() {
fmt.Printf("%02d:%02d: %.1fmm/u\n", t.Hour(), t.Minute(), val)
t = t.Add(timeInterval)
}
return
}
}
fmt.Fprintf(os.Stderr, "location not found: '%s'\n", location)
os.Exit(1)
}
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