123 lines
2.7 KiB
Go
123 lines
2.7 KiB
Go
package utils
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import (
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"log"
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"net"
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"os"
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"path/filepath"
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"sync"
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"github.com/lionsoul2014/ip2region/binding/golang/xdb"
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)
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var (
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searcher *xdb.Searcher
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once sync.Once
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)
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// InitIP2Region 初始化 ip2region
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// 需要 ip2region.xdb 文件，如果不存在则仅支持基本IP解析
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// 如果 dbPath 为空，将自动从环境变量或可执行文件目录查找
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func InitIP2Region(dbPath string) {
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once.Do(func() {
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var err error
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var finalPath string
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// 1. 如果传入了路径，直接使用
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if dbPath != "" {
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finalPath = dbPath
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} else {
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// 2. 优先从环境变量读取
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finalPath = os.Getenv("IP2REGION_DB_PATH")
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if finalPath == "" {
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// 3. 尝试在可执行文件同级目录查找
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execPath, err := os.Executable()
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if err == nil {
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execDir := filepath.Dir(execPath)
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candidatePath := filepath.Join(execDir, "ip2region.xdb")
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if _, err := os.Stat(candidatePath); err == nil {
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finalPath = candidatePath
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}
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}
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// 4. 如果还没找到，尝试当前工作目录（兼容开发环境）
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if finalPath == "" {
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candidatePath := "./ip2region.xdb"
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if _, err := os.Stat(candidatePath); err == nil {
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finalPath = candidatePath
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}
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}
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}
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}
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// 如果最终路径为空，说明找不到文件
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if finalPath == "" {
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log.Printf("IP2Region database file not found. Region lookup will be disabled.")
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searcher = nil
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return
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}
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// 5. 尝试加载整个xdb到内存，性能最好
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cBuff, err := xdb.LoadContentFromFile(finalPath)
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if err != nil {
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log.Printf("Failed to load ip2region.xdb from %s: %v. Region lookup will be disabled.", finalPath, err)
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searcher = nil
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return
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}
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searcher, err = xdb.NewWithBuffer(nil, cBuff)
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if err != nil {
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log.Printf("Failed to create searcher: %v", err)
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searcher = nil
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return
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}
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log.Printf("IP2Region loaded successfully from %s", finalPath)
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})
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}
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// GetRegion 获取IP归属地
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// 返回格式: 国家|区域|省份|城市|ISP
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func GetRegion(ip string) string {
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// 添加 recover 保护，防止 panic 导致整个请求失败
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defer func() {
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if r := recover(); r != nil {
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log.Printf("Panic in GetRegion for IP %s: %v", ip, r)
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}
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}()
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if searcher == nil {
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return "Unknown"
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}
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// 过滤内网IP
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if isPrivateIP(ip) {
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return "Internal"
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}
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region, err := searcher.SearchByStr(ip)
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if err != nil {
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return "Unknown"
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}
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return region
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}
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// 简单判断内网IP
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func isPrivateIP(ipStr string) bool {
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ip := net.ParseIP(ipStr)
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if ip == nil {
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return false // 不是有效IP
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}
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if ip.IsLoopback() {
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return true
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}
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ip4 := ip.To4()
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if ip4 == nil {
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return false // 暂不处理IPv6内网判断
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}
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return ip4[0] == 10 ||
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(ip4[0] == 172 && ip4[1] >= 16 && ip4[1] <= 31) ||
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(ip4[0] == 192 && ip4[1] == 168)
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}
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