plugeth/dashboard/geoip.go

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2019-07-22 09:17:27 +00:00
// Copyright 2019 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package dashboard
import (
"net"
"time"
"github.com/apilayer/freegeoip"
)
// geoDBInfo contains all the geographical information we could extract based on an IP
// address.
type geoDBInfo struct {
Country struct {
Names struct {
English string `maxminddb:"en" json:"en,omitempty"`
} `maxminddb:"names" json:"names,omitempty"`
} `maxminddb:"country" json:"country,omitempty"`
City struct {
Names struct {
English string `maxminddb:"en" json:"en,omitempty"`
} `maxminddb:"names" json:"names,omitempty"`
} `maxminddb:"city" json:"city,omitempty"`
Location struct {
Latitude float64 `maxminddb:"latitude" json:"latitude,omitempty"`
Longitude float64 `maxminddb:"longitude" json:"longitude,omitempty"`
} `maxminddb:"location" json:"location,omitempty"`
}
// geoLocation contains geographical information.
type geoLocation struct {
Country string `json:"country,omitempty"`
City string `json:"city,omitempty"`
Latitude float64 `json:"latitude,omitempty"`
Longitude float64 `json:"longitude,omitempty"`
}
// geoDB represents a geoip database that can be queried for IP to geographical
// information conversions.
type geoDB struct {
geodb *freegeoip.DB
}
// Open creates a new geoip database with an up-to-date database from the internet.
func openGeoDB() (*geoDB, error) {
// Initiate a geoip database to cross reference locations
db, err := freegeoip.OpenURL(freegeoip.MaxMindDB, 24*time.Hour, time.Hour)
if err != nil {
return nil, err
}
// Wait until the database is updated to the latest data
select {
case <-db.NotifyOpen():
case err := <-db.NotifyError():
return nil, err
}
// Assemble and return our custom wrapper
return &geoDB{geodb: db}, nil
}
// Close terminates the database background updater.
func (db *geoDB) close() error {
db.geodb.Close()
return nil
}
// Lookup converts an IP address to a geographical location.
func (db *geoDB) lookup(ip net.IP) *geoDBInfo {
result := new(geoDBInfo)
db.geodb.Lookup(ip, result)
return result
}
// Location retrieves the geographical location of the given IP address.
func (db *geoDB) location(ip string) *geoLocation {
location := db.lookup(net.ParseIP(ip))
return &geoLocation{
Country: location.Country.Names.English,
City: location.City.Names.English,
Latitude: location.Location.Latitude,
Longitude: location.Location.Longitude,
}
}