dynamic conf

config.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"log"
 	"os"
+	"time"
 
 	"gopkg.in/yaml.v2"
 )
@@ -30,8 +31,8 @@ type (
 	}
 )
 
-func NewConfig() (Config, error) {
+func NewConfig() (*Config, error) {
-	var c Config
+	c := &Config{}
 
 	fs := flag.NewFlagSet(os.Args[0], flag.ContinueOnError)
 	fs.StringVar(&c.Cert.CRT, "crt", "", "path to .crt")
@@ -60,3 +61,25 @@ func NewConfig() (Config, error) {
 
 	return c, nil
 }
+
+func (c *Config) Start() {
+	go c.start()
+}
+
+func (c *Config) start() {
+	ch := time.NewTicker(30 * time.Second)
+	defer ch.Stop()
+
+	for range ch.C {
+		func() {
+			c2, err := NewConfig()
+			if err != nil {
+				return
+			}
+
+			if fmt.Sprintf("%+v", c.Domains) != fmt.Sprintf("%+v", c2.Domains) {
+				c.Domains = c2.Domains
+			}
+		}()
+	}
+}

main.go

@@ -21,6 +21,7 @@ func main() {
 	if err != nil {
 		panic(err)
 	}
+	c.Start()
 
 	s := &http.Server{
 		Addr:    fmt.Sprintf(":%d", c.Port),
@@ -40,7 +41,7 @@ func main() {
 
 var resolver = dnscache.New(time.Minute * 500)
 
-func (c Config) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+func (c *Config) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	endpoint := c.endpoint(r)
 	if endpoint.To == "" {
 		http.NotFound(w, r)
@@ -54,7 +55,7 @@ func (c Config) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
-func (c Config) serveHTTPRedir(w http.ResponseWriter, r *http.Request, endpoint Endpoint) {
+func (c *Config) serveHTTPRedir(w http.ResponseWriter, r *http.Request, endpoint Endpoint) {
 	if !c.basicAuth(w, r) {
 		return
 	}
@@ -68,7 +69,7 @@ func (c Config) serveHTTPRedir(w http.ResponseWriter, r *http.Request, endpoint
 
 var someDialer = &net.Dialer{}
 
-func (c Config) serveHTTPProxy(w http.ResponseWriter, r *http.Request, endpoint Endpoint) {
+func (c *Config) serveHTTPProxy(w http.ResponseWriter, r *http.Request, endpoint Endpoint) {
 	cors(w)
 	if r.Method == http.MethodOptions {
 		w.Header().Set("Content-Length", "0")
@@ -146,11 +147,11 @@ func cors(w http.ResponseWriter) {
 	w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, OPTIONS, TRACE, PATCH, HEAD, DELETE")
 }
 
-func (c Config) key(r *http.Request) string {
+func (c *Config) key(r *http.Request) string {
 	return strings.Split(r.Host, ".")[0]
 }
 
-func (c Config) handleAdmin(w http.ResponseWriter, r *http.Request) bool {
+func (c *Config) handleAdmin(w http.ResponseWriter, r *http.Request) bool {
 	switch c.key(r) {
 	case "_":
 		panic("not impl: list")
@@ -160,7 +161,7 @@ func (c Config) handleAdmin(w http.ResponseWriter, r *http.Request) bool {
 	return false
 }
 
-func (c Config) basicAuth(w http.ResponseWriter, r *http.Request) bool {
+func (c *Config) basicAuth(w http.ResponseWriter, r *http.Request) bool {
 	basicAuth := c.endpoint(r).BasicAuth
 	if noAuth := basicAuth == ""; noAuth {
 		return true
@@ -176,7 +177,7 @@ func (c Config) basicAuth(w http.ResponseWriter, r *http.Request) bool {
 	return true
 }
 
-func (c Config) endpoint(r *http.Request) Endpoint {
+func (c *Config) endpoint(r *http.Request) Endpoint {
 	key := c.key(r)
 	domain := strings.Split(strings.TrimPrefix(r.Host, key), ":")[0]
 	m, ok := c.Domains[domain]