frpc: support --reload command

cmd/frpc/main.go

@@ -15,7 +15,11 @@
 package main
 
 import (
+	"encoding/base64"
+	"encoding/json"
 	"fmt"
+	"io/ioutil"
+	"net/http"
 	"os"
 	"os/signal"
 	"strconv"
@@ -40,6 +44,7 @@ var usage string = `frpc is the client of frp
 
 Usage: 
     frpc [-c config_file] [-L log_file] [--log-level=<log_level>] [--server-addr=<server_addr>]
+    frpc [-c config_file] --reload
     frpc -h | --help
     frpc -v | --version
 
@@ -48,6 +53,7 @@ Options:
     -L log_file                 set output log file, including console
     --log-level=<log_level>     set log level: debug, info, warn, error
     --server-addr=<server_addr> addr which frps is listening for, example: 0.0.0.0:7000
+    --reload                    reload configure file without program exit
     -h --help                   show this screen
     -v --version                show version
 `
@@ -75,6 +81,46 @@ func main() {
 	}
 	config.ClientCommonCfg.ConfigFile = confFile
 
+	// check if reload command
+	if args["--reload"] != nil {
+		if args["--reload"].(bool) {
+			req, err := http.NewRequest("GET", "http://"+
+				config.ClientCommonCfg.AdminAddr+":"+fmt.Sprintf("%d", config.ClientCommonCfg.AdminPort)+"/api/reload", nil)
+			if err != nil {
+				fmt.Printf("frps reload error: %v\n", err)
+				os.Exit(1)
+			}
+
+			authStr := "Basic " + base64.StdEncoding.EncodeToString([]byte(config.ClientCommonCfg.AdminUser+":"+
+				config.ClientCommonCfg.AdminPwd))
+
+			req.Header.Add("Authorization", authStr)
+			resp, err := http.DefaultClient.Do(req)
+			if err != nil {
+				fmt.Printf("frpc reload error: %v\n", err)
+				os.Exit(1)
+			} else {
+				defer resp.Body.Close()
+				body, err := ioutil.ReadAll(resp.Body)
+				if err != nil {
+					fmt.Printf("frpc reload error: %v\n", err)
+					os.Exit(1)
+				}
+				res := &client.GeneralResponse{}
+				err = json.Unmarshal(body, &res)
+				if err != nil {
+					fmt.Printf("http response error: %s\n", strings.TrimSpace(string(body)))
+					os.Exit(1)
+				} else if res.Code != 0 {
+					fmt.Printf("reload error: %s\n", res.Msg)
+					os.Exit(1)
+				}
+				fmt.Printf("reload success\n")
+				os.Exit(0)
+			}
+		}
+	}
+
 	if args["-L"] != nil {
 		if args["-L"].(string) == "console" {
 			config.ClientCommonCfg.LogWay = "console"