proxy: improve reconnect logic, send version, properly version proxy

proxy/cmd/server.go

@@ -1,6 +1,7 @@
 package cmd
 
 import (
+	"fmt"
 	"math/rand"
 	"net/url"
 	"os"
@@ -10,20 +11,33 @@ import (
 	"github.com/BeryJu/passbook/proxy/pkg/server"
 )
 
+const helpMessage = `passbook proxy
+
+Required environment variables:
+ - PASSBOOK_HOST: URL to connect to (format "http://passbook.company")
+ - PASSBOOK_TOKEN: Token to authenticate with
+ - PASSBOOK_INSECURE: Skip SSL Certificate verification`
+
 // RunServer main entrypoint, runs the full server
 func RunServer() {
 	pbURL, found := os.LookupEnv("PASSBOOK_HOST")
 	if !found {
-		panic("env PASSBOOK_HOST not set!")
+		fmt.Println("env PASSBOOK_HOST not set!")
+		fmt.Println(helpMessage)
+		os.Exit(1)
 	}
 	pbToken, found := os.LookupEnv("PASSBOOK_TOKEN")
 	if !found {
-		panic("env PASSBOOK_TOKEN not set!")
+		fmt.Println("env PASSBOOK_TOKEN not set!")
+		fmt.Println(helpMessage)
+		os.Exit(1)
 	}
 
 	pbURLActual, err := url.Parse(pbURL)
 	if err != nil {
-		panic(err)
+		fmt.Println(err)
+		fmt.Println(helpMessage)
+		os.Exit(1)
 	}
 
 	rand.Seed(time.Now().UnixNano())