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measurements.go
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/
measurements.go
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package main
import (
"encoding/json"
"io"
"log"
"net/http"
"net/url"
"os"
"sort"
"strconv"
"strings"
"time"
"github.com/PuerkitoBio/goquery"
)
func loadMeasurements(file string) ([]Measurements, error) {
var currentValues []Measurements
j, err := os.Open(file)
if err != nil {
if os.IsNotExist(err) {
return currentValues, nil
}
return nil, err
}
defer j.Close()
err = json.NewDecoder(j).Decode(¤tValues)
if err != nil {
return nil, err
}
return currentValues, nil
}
func saveMeasurements(file string, values []Measurements) error {
f, err := os.OpenFile(file, os.O_WRONLY|os.O_CREATE, 0666)
if err != nil {
return err
}
defer f.Close()
err = json.NewEncoder(f).Encode(values)
if err != nil {
return err
}
return nil
}
func stationData(station string, from, to time.Time) (io.ReadCloser, error) {
values := make(url.Values)
values.Set("estaciones[]", station)
values.Add("variables[]", "2007-variable")
values.Add("variables[]", "2002-variable")
values.Add("variables[]", "2003-variable")
values.Add("intervalos", "hour")
values.Add("desde", from.Format("02-01-2006"))
values.Add("hasta", to.Format("02-01-2006"))
values.Add("desde_meses", "01")
values.Add("desde_anos", "2017")
values.Add("hasta_meses", "12")
values.Add("hasta_anos", "2017")
values.Add("desde_anos_a", "2017")
values.Add("hasta_anos_a", "2017")
values.Add("html", "html")
resp, err := http.PostForm(agrometURL, values)
if err != nil {
return nil, err
}
return resp.Body, nil
}
type Measurements struct {
Date time.Time `json:"date"`
Temperature float64 `json:"temperature"`
Humidity float64 `json:"humidity"`
WindVelocity float64 `json:"wind_velocity"`
}
func extractMeasurements(r io.Reader) ([]Measurements, error) {
doc, err := goquery.NewDocumentFromReader(r)
if err != nil {
return nil, nil
}
var values []Measurements
i := 0
var currentValue Measurements
doc.Find(".table.table-striped.table-bordered > tbody > tr > td").Each(func(_ int, node *goquery.Selection) {
switch i % 5 {
case 1:
date, err := time.Parse("02-01-2006 15:04", node.Text())
if err != nil {
date, err = time.Parse("02-01-2006", node.Text())
if err != nil {
log.Print(err)
}
}
currentValue.Date = date.UTC()
case 2:
temp, err := valueToFloat(node.Text())
if err != nil {
log.Print(err)
}
currentValue.Temperature = temp
case 3:
hum, err := valueToFloat(node.Text())
if err != nil {
log.Print(err)
}
currentValue.Humidity = hum
case 4:
windVel, err := valueToFloat(node.Text())
if err != nil {
log.Print(err)
}
currentValue.WindVelocity = windVel
values = append(values, currentValue)
}
i++
})
return values, nil
}
func valueToFloat(value string) (float64, error) {
if value == "-" {
return 0, nil
}
fixedSz := strings.Replace(value, ",", ".", 1)
return strconv.ParseFloat(fixedSz, 64)
}
func mergeMeasurements(m1, m2 []Measurements) []Measurements {
merged := make([]Measurements, 0, len(m1)+len(m2))
if len(m1) > 0 {
merged = append(merged, m1...)
}
dates := make(map[time.Time]struct{})
for _, m := range m1 {
dates[m.Date] = struct{}{}
}
for _, m := range m2 {
_, ok := dates[m.Date]
if !ok {
merged = append(merged, m)
}
}
sort.Slice(merged, func(i, j int) bool {
return merged[i].Date.Before(merged[j].Date)
})
return merged
}