IP Dabatase

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package main

import (
	"bufio"
	"fmt"
	"log"
	"math"
	"net"
	"os"
	"strconv"
	"strings"

	"github.com/maxmind/mmdbwriter"
	"github.com/maxmind/mmdbwriter/inserter"
	"github.com/maxmind/mmdbwriter/mmdbtype"
)

func IPv4NumToCidr(ipStartUint32 uint32, ipEndUint32 uint32) (cidrs []string, err error) {
	cidr2mask := []uint32{
		0x00000000, 0x80000000, 0xC0000000,
		0xE0000000, 0xF0000000, 0xF8000000,
		0xFC000000, 0xFE000000, 0xFF000000,
		0xFF800000, 0xFFC00000, 0xFFE00000,
		0xFFF00000, 0xFFF80000, 0xFFFC0000,
		0xFFFE0000, 0xFFFF0000, 0xFFFF8000,
		0xFFFFC000, 0xFFFFE000, 0xFFFFF000,
		0xFFFFF800, 0xFFFFFC00, 0xFFFFFE00,
		0xFFFFFF00, 0xFFFFFF80, 0xFFFFFFC0,
		0xFFFFFFE0, 0xFFFFFFF0, 0xFFFFFFF8,
		0xFFFFFFFC, 0xFFFFFFFE, 0xFFFFFFFF,
	}

	for ipEndUint32 >= ipStartUint32 {
		maxSize := 32
		for maxSize > 0 {

			maskedBase := ipStartUint32 & cidr2mask[maxSize-1]

			if maskedBase != ipStartUint32 {
				break
			}
			maxSize--

		}

		x := math.Log(float64(ipEndUint32-ipStartUint32+1)) / math.Log(2)
		maxDiff := 32 - int(math.Floor(x))
		if maxSize < maxDiff {
			maxSize = maxDiff
		}

		cidrs = append(cidrs, uInt32ToIPv4(ipStartUint32)+"/"+strconv.Itoa(maxSize))

		ipStartUint32 += uint32(math.Exp2(float64(32 - maxSize)))
	}

	return cidrs, err
}

//Convert uint32 to IP
func uInt32ToIPv4(iPuInt32 uint32) (iP string) {
	iP = fmt.Sprintf("%d.%d.%d.%d",
		iPuInt32>>24,
		(iPuInt32&0x00FFFFFF)>>16,
		(iPuInt32&0x0000FFFF)>>8,
		iPuInt32&0x000000FF)
	return iP
}

func main() {
	// read the txt
	f, err := os.Open("./test.txt")
	if err != nil {
		fmt.Println("open file test.txt error " + err.Error())
	}
	defer f.Close()

	writer, _ := mmdbwriter.New(
		mmdbwriter.Options{
			DatabaseType:            "GeoLite2-City",
			RecordSize:              28,
			IncludeReservedNetworks: true,
		},
	)
	if err != nil {
		log.Fatal(err)
	}

	scanner := bufio.NewScanner(f)
	fh, err := os.Create("./test.mmdb")
	fmt.Println("create load mmdb")

	for scanner.Scan() {
		if err != nil {
			fmt.Println("open file test.mmdb error " + err.Error())
		}
		line := scanner.Text()
		ip_array := strings.Split(line, "|")
		fmt.Println(ip_array)
		ip_start_string := ip_array[0]
		ip_end_string := ip_array[1]
		fmt.Println(ip_start_string, ip_end_string)
		ip_start, _ := strconv.Atoi(ip_array[2])
		ip_start_num := uint32(ip_start)
		fmt.Println("ip start num ", ip_start_num)
		ip_end, _ := strconv.Atoi(ip_array[3])
		ip_end_num := uint32(ip_end)
		fmt.Println("ip end num ", ip_end_num)
		continent := ip_array[4]
		fmt.Println("continent :", continent)
		country := ip_array[5]
		fmt.Println("country ", country)
		province := ip_array[6]
		fmt.Println("province ", province)
		city := ip_array[7]
		district := ip_array[8]
		fmt.Println("district ", district)
		isp := ip_array[9]
		fmt.Println("isp ", isp)
		fmt.Println(ip_array[13], ip_array[14])
		lot, _ := strconv.ParseFloat(ip_array[13], 32)
		fmt.Println("longitude ", lot)
		lat, _ := strconv.ParseFloat(ip_array[14], 32)
		fmt.Println("langitude ", lat)

		cidrs, _ := IPv4NumToCidr(ip_start_num, ip_end_num)
		fmt.Println(cidrs)
		for _, cidr := range cidrs {

			fmt.Println("cidr ", cidr)
			_, network, err := net.ParseCIDR(cidr)
			if err != nil {
				fmt.Printf("parse cidr caught error %s", err.Error())
			}
			record := mmdbtype.Map{
				"location": mmdbtype.Map{
					"latitude":  mmdbtype.Uint32(lat),
					"longitude": mmdbtype.Uint32(lot),
					"time_zone": mmdbtype.String(province),
				},
				"city": mmdbtype.Map{
					"names": mmdbtype.Map{
						"en": mmdbtype.String(city),
					},
				},
				"continent": mmdbtype.Map{
					"code": mmdbtype.String(continent),
					"names": mmdbtype.Map{
						"en": mmdbtype.String(continent),
					},
				},
				"country": mmdbtype.Map{
					"names": mmdbtype.Map{
						"en": mmdbtype.String(country),
					},
					"iso_code": mmdbtype.String(isp),
				},
			}
			if err := writer.InsertFunc(network, inserter.TopLevelMergeWith(record)); err != nil {
				log.Fatal(err)
			}
		}
	}

	_, err = writer.WriteTo(fh)
	if err != nil {
		log.Fatal(err)
	}
	defer fh.Close()
}