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main.go
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main.go
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package main
import (
"bytes"
"flag"
"fmt"
"io/ioutil"
"os"
"time"
"path"
"io"
client "github.com/influxdata/influxdb/client/v2"
"github.com/jfyuen/synopcsv"
"github.com/pkg/errors"
)
func checkError(err error) {
if err != nil {
fmt.Fprintf(os.Stderr, "%+v\n", err)
os.Exit(1)
}
}
func downloadFile(path string, f func() (io.Reader, error)) error {
if fileExists(path) {
return nil
}
r, err := f()
if err != nil {
return errors.WithStack(err)
}
buf := new(bytes.Buffer)
buf.ReadFrom(r)
err = ioutil.WriteFile(path, buf.Bytes(), 0644)
if err != nil {
return errors.WithStack(err)
}
return nil
}
func fetchSingleMeasureCSV(at string, storePath string) ([]synopcsv.Measure, error) {
_, err := time.Parse("2006010215", at)
if err != nil {
return nil, errors.Wrap(err, "invalid date")
}
filename := path.Join(storePath, at+".csv")
err = downloadFile(filename, func() (io.Reader, error) { return synopcsv.FetchMeasureCSV(at) })
f, err := os.Open(filename)
if err != nil {
return nil, errors.WithStack(err)
}
defer f.Close()
return synopcsv.ParseMeasureCSV(f)
}
func fetchMultipleMeasureCSV(start string, end string, storePath string) ([]synopcsv.Measure, error) {
fromDate, err := time.Parse("200601", start)
if err != nil {
return nil, errors.Wrap(err, "invalid start date")
}
toDate, err := time.Parse("200601", end)
if err != nil {
return nil, errors.Wrap(err, "invalid end date")
}
measures := make([]synopcsv.Measure, 0)
for d := fromDate; d.Before(toDate); d = d.AddDate(0, 1, 0) {
dateStr := d.Format("200601")
filename := path.Join(storePath, dateStr+".csv")
err := downloadFile(filename, func() (io.Reader, error) { return synopcsv.FetchMeasureCSV(dateStr) })
f, err := os.Open(filename)
if err != nil {
return nil, errors.WithStack(err)
}
defer f.Close()
monthlyMeasures, err := synopcsv.ParseMeasureCSV(f)
if err != nil {
return nil, err
}
measures = append(measures, monthlyMeasures...)
}
return measures, nil
}
func fileExists(path string) bool {
_, err := os.Stat(path)
return !os.IsNotExist(err)
}
func readStations(p string) ([]synopcsv.Station, error) {
f, err := os.Open(p)
if err != nil {
return nil, errors.WithStack(err)
}
defer f.Close()
return synopcsv.ParseStationsCSV(f)
}
type flags struct {
dbURL, dbName, user, passwd, from, to, at, downloadPath, seriesName string
}
func (f flags) check() {
if f.at == "" && f.from == "" && f.to == "" {
fmt.Fprintf(os.Stderr, "need to provide a date using -at or a range with -from -to\n")
flag.PrintDefaults()
}
if f.at != "" && (f.from != "" || f.to != "") {
fmt.Fprintf(os.Stderr, "-at option provided with incompatible -from or -to\n")
flag.PrintDefaults()
}
}
func newFlags() flags {
f := flags{}
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "%s: fetches SYNOP station and meteo data from meteo france website\nSee https://donneespubliques.meteofrance.fr/?fond=produit&id_produit=90&id_rubrique=32 for more info\n", os.Args[0])
flag.PrintDefaults()
}
flag.StringVar(&f.dbURL, "url", "", "influxdb url")
flag.StringVar(&f.dbName, "dbname", "", "influxdb name")
flag.StringVar(&f.user, "user", "", "influxdb user")
flag.StringVar(&f.passwd, "passwd", "", "influxdb password")
flag.StringVar(&f.from, "from", "", "fetch meteo data from date (must also supply -to, incompatible with -at), , use YYYYMM")
flag.StringVar(&f.to, "to", "", "fetch meteo data to date excluded (must also supply -from, incompatible with -at), use YYYYMM")
flag.StringVar(&f.at, "at", "", "fetch meteo data at date (incompatible with -from/-to), use YYYYMMDDHH")
flag.StringVar(&f.downloadPath, "path", ".", "where to store downloaded files (default to current directory)")
flag.StringVar(&f.seriesName, "seriesName", "measurements", "series to store values in")
flag.Parse()
return f
}
func createPoint(m synopcsv.Measure, stationsMap map[string]synopcsv.Station, seriesName string) (*client.Point, error) {
tags := map[string]string{
"station_id": m.StationID,
}
station := stationsMap[m.StationID]
fields := map[string]interface{}{
"longitude": station.Longitude,
"latitude": station.Latitude,
"altitude": station.Altitude,
// TODO: add more data
}
if m.Temperature != nil {
fields["temperature"] = *m.Temperature
}
if m.Humidity != nil {
fields["humidity"] = *m.Humidity
}
if m.WindSpeed != nil {
fields["wind_speed"] = *m.WindSpeed
}
pt, err := client.NewPoint(
seriesName,
tags,
fields,
m.Date,
)
return pt, errors.WithStack(err)
}
func insertMeasuresInflux(measures []synopcsv.Measure, stationsMap map[string]synopcsv.Station, f flags) error {
c, err := client.NewHTTPClient(client.HTTPConfig{
Addr: f.dbURL,
Username: f.user,
Password: f.passwd,
})
if err != nil {
return errors.Wrap(err, "Error creating InfluxDB Client")
}
defer c.Close()
bpconf := client.BatchPointsConfig{
Database: f.dbName,
Precision: "s",
}
bp, _ := client.NewBatchPoints(bpconf)
batchSize := 5000
for _, m := range measures {
pt, err := createPoint(m, stationsMap, f.seriesName)
if err != nil {
return errors.Wrap(err, "error creating point")
}
bp.AddPoint(pt)
if len(bp.Points()) > batchSize {
if err := c.Write(bp); err != nil {
return errors.Wrap(err, "error batch writing")
}
bp, _ = client.NewBatchPoints(bpconf)
}
}
return errors.Wrap(c.Write(bp), "error batch writing")
}
func main() {
f := newFlags()
f.check()
stationFilename := path.Join(f.downloadPath, "stations.csv")
err := downloadFile(stationFilename, synopcsv.FetchStationCSV)
checkError(err)
stations, err := readStations(stationFilename)
checkError(err)
stationsMap := make(map[string]synopcsv.Station)
for _, s := range stations {
stationsMap[s.ID] = s
}
var measures []synopcsv.Measure
if f.at != "" {
measures, err = fetchSingleMeasureCSV(f.at, f.downloadPath)
} else {
measures, err = fetchMultipleMeasureCSV(f.from, f.to, f.downloadPath)
}
checkError(err)
if f.dbURL != "" {
err := insertMeasuresInflux(measures, stationsMap, f)
checkError(err)
}
}