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package mountainpass
import (
"bytes"
"database/sql"
"encoding/csv"
"errors"
"fmt"
"io"
"log/slog"
"net/http"
"os"
"strconv"
"strings"
"time"
"github.com/martinlehoux/kagamigo/kcore"
"github.com/schollz/progressbar/v3"
)
type MountainPass struct {
Name string
ExternalID string
CountryCode string
DepartmentCode string
Elevation int
}
func parseMountainPasses(reader io.Reader) ([]MountainPass, error) {
mountainPasses := make([]MountainPass, 0)
csvReader := csv.NewReader(reader)
csvReader.Comma = '\t'
csvReader.LazyQuotes = true
rows, err := csvReader.ReadAll()
if err != nil {
return nil, kcore.Wrap(err, "Failed to read mountain pass CSV data")
}
rows = rows[1:]
for _, row := range rows {
if len(row) < 4 {
return nil, fmt.Errorf("unexpected row with %d fields: %v", len(row), row)
}
countryCode, departmentCode, err := splitCountryDepartment(row[0])
if err != nil {
return nil, err
}
codes := strings.Split(row[1], " | ")
names := strings.Split(row[2], " | ")
altitudes := strings.Split(row[3], " | ")
if len(codes) != len(names) || len(codes) != len(altitudes) {
return nil, fmt.Errorf("inconsistent multi-pass row: %v", row)
}
for i := range codes {
elevation, err := strconv.Atoi(altitudes[i])
if err != nil {
return nil, fmt.Errorf("failed to parse elevation %q: %w", altitudes[i], err)
}
mountainPasses = append(mountainPasses, MountainPass{
ExternalID: "centcols/" + codes[i],
CountryCode: countryCode,
Name: names[i],
DepartmentCode: departmentCode,
Elevation: elevation,
})
}
}
return mountainPasses, nil
}
func splitCountryDepartment(brevet string) (string, string, error) {
parts := strings.Split(brevet, "-")
if len(parts) != 2 || parts[0] == "" || parts[1] == "" {
return "", "", fmt.Errorf("unexpected brevet code: %q", brevet)
}
return parts[0], parts[1], nil
}
func getCSVData(departmentCode string) ([]byte, error) {
url := "https://www.centcols.org/membres/cols/csvbrevet.php?id=FR" + departmentCode + "&enc=UTF-8"
res, err := http.Get(url)
if err != nil {
return nil, err
}
defer res.Body.Close()
if res.StatusCode != http.StatusOK {
return nil, statusError{statusCode: res.StatusCode}
}
return io.ReadAll(res.Body)
}
type statusError struct {
statusCode int
}
func (e statusError) Error() string {
return fmt.Sprintf("unexpected status code: %d", e.statusCode)
}
const downloadRetries = 3
func departmentCacheFile(departmentCode string) string {
return fmt.Sprintf("debug_department_%s.csv", departmentCode)
}
func loadCachedDepartment(filename string) ([]MountainPass, bool, error) {
data, err := os.ReadFile(filename)
if err != nil {
if errors.Is(err, os.ErrNotExist) {
return nil, false, nil
}
return nil, false, err
}
mountainPasses, err := parseMountainPasses(bytes.NewReader(data))
if err != nil {
return nil, false, nil
}
return mountainPasses, true, nil
}
func downloadDepartment(departmentCode string, resume bool) ([]MountainPass, error) {
filename := departmentCacheFile(departmentCode)
if resume {
mountainPasses, found, err := loadCachedDepartment(filename)
if err != nil {
return nil, err
}
if found {
return mountainPasses, nil
}
}
var lastErr error
backoff := time.Second
for attempt := 1; attempt <= downloadRetries; attempt++ {
data, err := getCSVData(departmentCode)
if err != nil {
lastErr = err
var statusErr statusError
if errors.As(err, &statusErr) && statusErr.statusCode == http.StatusTooManyRequests {
backoff = time.Minute
}
slog.Warn("Retrying department download", "department", departmentCode, "attempt", attempt, "error", err)
time.Sleep(backoff)
backoff *= 2
continue
}
mountainPasses, err := parseMountainPasses(bytes.NewReader(data))
if err != nil {
if writeErr := os.WriteFile(filename, data, 0644); writeErr != nil {
return nil, kcore.Wrap(writeErr, "Failed to write dump file")
}
return nil, err
}
if writeErr := os.WriteFile(filename, data, 0644); writeErr != nil {
return nil, kcore.Wrap(writeErr, "Failed to write dump file")
}
return mountainPasses, nil
}
return nil, lastErr
}
func DownloadMountainPasses(db *sql.DB, delay time.Duration, resume bool) error {
mountainPasses := make([]MountainPass, 0)
bar := progressbar.Default(90)
ticker := time.NewTicker(delay)
for i := 1; i <= 90; i++ {
<-ticker.C
bar.Add(1)
departmentCode := fmt.Sprintf("%02d", i)
bar.Describe(fmt.Sprintf("Downloading mountain passes for department_code=%s", departmentCode))
departmentMountainPasses, err := downloadDepartment(departmentCode, resume)
if err != nil {
return kcore.Wrap(err, "Failed to download mountain passes for department "+departmentCode)
}
mountainPasses = append(mountainPasses, departmentMountainPasses...)
}
tx, err := db.Begin()
kcore.Expect(err, "Failed to begin transaction")
defer tx.Rollback()
stmt, err := tx.Prepare(`
INSERT INTO mountain_passes (external_id, name, country_code, department_code, elevation)
VALUES (?, ?, ?, ?, ?)
ON CONFLICT(external_id) DO UPDATE SET
name = excluded.name,
country_code = excluded.country_code,
department_code = excluded.department_code,
elevation = excluded.elevation
`)
kcore.Expect(err, "Failed to prepare statement")
defer stmt.Close()
for _, mountainPass := range mountainPasses {
_, err := stmt.Exec(mountainPass.ExternalID, mountainPass.Name, mountainPass.CountryCode, mountainPass.DepartmentCode, mountainPass.Elevation)
kcore.Expect(err, "Failed to execute statement")
}
return tx.Commit()
}
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