Fix traffic map zoom and add paginated history with local city GeoIP

traffic_city.go

@@ -0,0 +1,166 @@
+package main
+
+import (
+	"compress/gzip"
+	"crypto/sha1"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/oschwald/maxminddb-golang"
+)
+
+const cityDownloadURL = "https://download.db-ip.com/free/dbip-city-lite-2026-10.mmdb.gz"
+const cityDatabaseSHA1 = "df17bd24390108ed1d24dcb7718dc60f6b9abd4f"
+
+var trafficCity struct {
+	sync.Mutex
+	once    sync.Once
+	db      *maxminddb.Reader
+	running bool
+	message string
+}
+
+func trafficCityPath() string {
+	db := os.Getenv("DASHBOARD_DB_PATH")
+	if db == "" {
+		db = defaultDatabasePath
+	}
+	return filepath.Join(filepath.Dir(db), "dbip-city.mmdb")
+}
+func trafficCityReady() bool {
+	trafficCity.once.Do(func() {
+		trafficCity.Lock()
+		defer trafficCity.Unlock()
+		trafficCity.db, _ = maxminddb.Open(trafficCityPath())
+		if trafficCity.db != nil && !strings.Contains(strings.ToLower(trafficCity.db.Metadata.DatabaseType), "city") {
+			trafficCity.db.Close()
+			trafficCity.db = nil
+		}
+	})
+	trafficCity.Lock()
+	defer trafficCity.Unlock()
+	return trafficCity.db != nil
+}
+func lookupTrafficCity(text string) (string, string) {
+	ip := net.ParseIP(text)
+	if ip == nil || ip.IsPrivate() || ip.IsLoopback() || ip.IsLinkLocalUnicast() || !ip.IsGlobalUnicast() || !trafficCityReady() {
+		return "", ""
+	}
+	trafficCity.Lock()
+	defer trafficCity.Unlock()
+	var r struct {
+		City struct {
+			Names map[string]string `maxminddb:"names"`
+		} `maxminddb:"city"`
+		Subdivisions []struct {
+			Names map[string]string `maxminddb:"names"`
+		} `maxminddb:"subdivisions"`
+	}
+	if trafficCity.db.Lookup(ip, &r) != nil {
+		return "", ""
+	}
+	region := ""
+	if len(r.Subdivisions) > 0 {
+		region = cityName(r.Subdivisions[0].Names)
+	}
+	return cityName(r.City.Names), region
+}
+func trafficCityRoutes(mux *http.ServeMux) {
+	mux.HandleFunc("/api/settings/traffic/city-database", func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != "GET" && r.Method != "POST" {
+			w.WriteHeader(405)
+			return
+		}
+		trafficCityReady()
+		trafficCity.Lock()
+		if r.Method == "POST" && !trafficCity.running && trafficCity.db == nil {
+			trafficCity.running = true
+			trafficCity.message = "Загрузка базы городов (около 58 МБ)…"
+			go func() {
+				err := installTrafficCity()
+				trafficCity.Lock()
+				defer trafficCity.Unlock()
+				trafficCity.running = false
+				if err != nil {
+					trafficCity.message = "Не удалось установить базу: " + err.Error()
+				} else {
+					trafficCity.message = "База городов DB-IP City Lite 2026-10 установлена"
+				}
+			}()
+		}
+		status := map[string]any{"ready": trafficCity.db != nil, "running": trafficCity.running, "message": trafficCity.message, "date": "2026-10"}
+		trafficCity.Unlock()
+		writeJSON(w, status, nil)
+	})
+}
+func installTrafficCity() error { return installTrafficCityFrom(cityDownloadURL, cityDatabaseSHA1) }
+func installTrafficCityFrom(source, expectedHash string) error {
+	client := &http.Client{Timeout: 15 * time.Minute}
+	response, err := client.Get(source)
+	if err != nil {
+		return err
+	}
+	defer response.Body.Close()
+	if response.StatusCode != 200 {
+		return fmt.Errorf("HTTP %d", response.StatusCode)
+	}
+	reader, err := gzip.NewReader(io.LimitReader(response.Body, 70<<20))
+	if err != nil {
+		return err
+	}
+	defer reader.Close()
+	path := trafficCityPath()
+	if err = os.MkdirAll(filepath.Dir(path), 0750); err != nil {
+		return err
+	}
+	file, err := os.CreateTemp(filepath.Dir(path), ".city-*.mmdb")
+	if err != nil {
+		return err
+	}
+	defer os.Remove(file.Name())
+	defer file.Close()
+	hash := sha1.New()
+	n, err := io.Copy(io.MultiWriter(file, hash), io.LimitReader(reader, (160<<20)+1))
+	if err != nil {
+		return err
+	}
+	if n > 160<<20 {
+		return fmt.Errorf("база превышает лимит размера")
+	}
+	if hex.EncodeToString(hash.Sum(nil)) != expectedHash {
+		return fmt.Errorf("контрольная сумма базы не совпала")
+	}
+	if err = file.Sync(); err != nil {
+		return err
+	}
+	if err = file.Close(); err != nil {
+		return err
+	}
+	db, err := maxminddb.Open(file.Name())
+	if err != nil {
+		return err
+	}
+	if !strings.Contains(strings.ToLower(db.Metadata.DatabaseType), "city") {
+		db.Close()
+		return fmt.Errorf("неверный тип GeoIP-базы")
+	}
+	if err = os.Rename(file.Name(), path); err != nil {
+		db.Close()
+		return err
+	}
+	trafficCity.Lock()
+	defer trafficCity.Unlock()
+	if trafficCity.db != nil {
+		trafficCity.db.Close()
+	}
+	trafficCity.db = db
+	return nil
+}