update

common.go

@@ -1,8 +1,13 @@
 package mycommon
 
 import (
+	"errors"
 	"git.makemake.in/kzkzzzz/mycommon/mylog"
+	"log"
+	"net"
+	"os"
 	"runtime/debug"
+	"sync"
 )
 
 func SafeFn(fn func()) {
@@ -20,3 +25,62 @@ func SafeGo(fn func()) {
 		SafeFn(fn)
 	}()
 }
+
+var (
+	getIpOnce  = &sync.Once{}
+	outBoundIp = "127.0.0.1"
+)
+
+// GetOutboundIP 获取本机ip
+func GetOutboundIP() string {
+	getIpOnce.Do(func() {
+		conn, err := net.Dial("udp", "223.5.5.5:53")
+		if err != nil {
+			log.Printf("get outbound ip err: %s", err)
+			return
+		}
+		defer conn.Close()
+
+		localAddr := conn.LocalAddr().(*net.UDPAddr)
+
+		if localAddr.IP != nil {
+			outBoundIp = localAddr.IP.String()
+		}
+	})
+
+	return outBoundIp
+}
+
+var (
+	getHostNameOnce = &sync.Once{}
+	hostName        = "unknown"
+)
+
+// GetHostName 获取hostname
+func GetHostName() string {
+	getHostNameOnce.Do(func() {
+		v, err := os.Hostname()
+		if err != nil {
+			log.Printf("get host name err: %s", err)
+			return
+		}
+
+		hostName = v
+	})
+
+	return hostName
+}
+
+func ExistFile(file string) bool {
+	_, err := os.Stat(file)
+	if err == nil {
+		return true
+	}
+
+	if errors.Is(err, os.ErrNotExist) {
+		return false
+	}
+
+	// 其他错误
+	return false
+}