make httpagent a plugin

cmd/helloserver/gopreload.go

@@ -0,0 +1,9 @@
+// gopreload.go
+package main
+
+/*
+   This file is separate to make it very easy to both add into an application, but
+   also very easy to remove.
+*/
+
+import _ "github.com/Xe/gopreload"

plugins/autohttpagent/main.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"crypto/tls"
+	"log"
+	"os"
+	"time"
+
+	"git.xeserv.us/xena/route/lib/tun2"
+	"github.com/Xe/ln"
+)
+
+var (
+	token      = mustEnv("ROUTE_TOKEN", "")
+	domain     = mustEnv("ROUTE_DOMAIN", "")
+	backend    = mustEnv("ROUTE_BACKEND", "")
+	method     = mustEnv("ROUTE_METHOD", "")
+	serverAddr = mustEnv("ROUTE_LOAD_BALANCER", "")
+	connMethod = mustEnv("ROUTE_METHOD", "tcp")
+)
+
+func mustEnv(key string, def string) string {
+	val := os.Getenv(key)
+	if val == "" {
+		log.Printf("autohttpagent: %s not found, things may not work", key)
+		return def
+	}
+
+	return val
+}
+
+func doHttpAgent() {
+	go func() {
+		cfg := &tun2.ClientConfig{
+			TLSConfig:  &tls.Config{},
+			ConnType:   connMethod,
+			ServerAddr: serverAddr,
+			Token:      token,
+			Domain:     domain,
+			BackendURL: backend,
+		}
+
+		client, _ := tun2.NewClient(cfg)
+		err := client.Connect()
+		if err != nil {
+			ln.Error(err, ln.F{
+				"action": "client_running",
+			})
+
+			time.Sleep(5 * time.Second)
+
+			doHttpAgent()
+		}
+	}()
+}
+
+func init() {
+	doHttpAgent()
+}