weathergrabber/main.go

85 lines
1.6 KiB
Go

package main
import (
"encoding/csv"
"encoding/json"
"fmt"
"net/http"
"os"
"strconv"
"time"
"git.ultraware.nl/Ultraware/util"
)
type day struct {
Date int `json:"valid_time_gmt"`
AvgTemperature int `json:"temp"`
}
type data struct {
Observations []day `json:"observations"`
}
func main() {
from := getNextDate()
if from.After(time.Now()) {
fmt.Println(`Nothing to get, exiting ...`)
os.Exit(0)
}
to := from.AddDate(0, 0, 21)
if to.After(time.Now()) {
to = time.Now()
}
url := `https://api.weather.com/v1/location/EHGG:9:NL/observations/historical.json?apiKey=6532d6454b8aa370768e63d6ba5a832e&units=e&startDate=` + from.Format(`20060102`) + `&endDate=` + to.Format(`20060102`)
resp, err := http.Get(url)
util.PanicOnErr(err)
// f, err := os.Open(`data.json`)
// util.PanicOnErr(err)
var d data
err = json.NewDecoder(resp.Body).Decode(&d)
util.PanicOnErr(err)
out, err := os.OpenFile(`weather.csv`, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600)
util.PanicOnErr(err)
csvout := csv.NewWriter(out)
for _, day := range d.Observations {
csvout.Write([]string{strconv.Itoa(day.Date), fToCString(day.AvgTemperature)})
}
csvout.Flush()
}
func getNextDate() time.Time {
f, err := os.Open(`weather.csv`)
if err != nil {
return time.Date(2019, 11, 1, 0, 0, 0, 0, time.Local)
}
csvf := csv.NewReader(f)
var last []string
for {
row, err := csvf.Read()
if err != nil {
break
}
last = row
}
u, err := strconv.ParseInt(last[0], 10, 64)
util.PanicOnErr(err)
t := time.Unix(u, 0)
return t.AddDate(0, 0, 1)
}
func fToCString(temp int) string {
return strconv.FormatFloat(float64(temp-32)/1.8, 'f', 1, 64)
}