Add thorough checks for config values

client.go

@@ -196,22 +196,39 @@ func getConfig(configFile string) (c config, err error) {
 		return
 	}
 
-	err = c.fetchConfig()
-	if err != nil {
-		log.Fatalf("[Conf] Error fetching remote config: %s", err)
-		return
+	// check the config values
+	if c.Host == "" {
+		log.Fatalf("[Conf] No 'host' in config")
+	}
+	if c.Username == "" {
+		log.Fatalf("[Conf] No 'user' in config")
+	}
+	if c.Password == "" {
+		log.Fatalf("[Conf] No 'password' in config")
+	}
+	if c.FetchIntervalString == "" {
+		log.Fatalf("[Conf] No 'fetch_interval' in config")
+	}
+	if c.ReconnectTimeoutString == "" {
+		log.Fatalf("[Conf] No 'reconnect_timeout' in config")
 	}
+
+	// parse som of the config values
 	if c.FetchInterval, err = time.ParseDuration(c.FetchIntervalString); err != nil {
 		log.Printf("[Conf] Error parsing fetch interval: %s", err)
 		return
 	}
-	log.Printf("[Conf] Fetch interval set to %s", c.FetchInterval)
-
 	if c.ReconnectTimeout, err = time.ParseDuration(c.ReconnectTimeoutString); err != nil {
 		log.Printf("[Conf] Error parsing reconnect timeout: %s", err)
 		return
 	}
-	log.Printf("[Conf] Reconnect timeout set to %s", c.ReconnectTimeout)
+
+	// fetch the remote configuration
+	err = c.fetchConfig()
+	if err != nil {
+		log.Fatalf("[Conf] Error fetching remote config: %s", err)
+		return
+	}
 
 	// initialize the task queues
 	c.NewTasks = make(chan task)