Merge pull request #3 from launchdarkly/jkodumal/ch3665/ld-relay-shou…

…ld-have-a-default-port

Add a default port, and check if no environments are specified.

README.md

@@ -58,6 +58,8 @@ Here's an example configuration file that synchronizes four environments across
         [environment "Shopnify Project Test"]
         apiKey = "SHOPNIFY_TEST_API_KEY"
 
+Your configuration file must include at least one environment.
+
 Relay proxy mode
 ----------------
 

ld-relay.go

@@ -23,6 +23,7 @@ import (
 
 const (
 	defaultRedisLocalTtlMs = 30000
+	defaultPort            = 8030
 )
 
 var (
@@ -92,6 +93,16 @@ func main() {
 		c.Redis.LocalTtl = &localTtl
 	}
 
+	if c.Main.Port == 0 {
+		Info.Printf("No port specified in configuration file. Using default port %d.", defaultPort)
+		c.Main.Port = defaultPort
+	}
+
+	if len(c.Environment) == 0 {
+		Error.Println("You must specify at least one environment in your configuration file. Exiting.")
+		os.Exit(1)
+	}
+
 	publisher := eventsource.NewServer()
 	publisher.Gzip = false
 	publisher.AllowCORS = true