Initial Atlas listener implementation

command/server/config.go

@@ -200,6 +200,7 @@ func ParseConfig(d string) (*Config, error) {
 	}
 
 	valid := []string{
+		"atlas",
 		"backend",
 		"ha_backend",
 		"listener",
@@ -414,6 +415,8 @@ func parseHABackends(result *Config, list *ast.ObjectList) error {
 }
 
 func parseListeners(result *Config, list *ast.ObjectList) error {
+	var foundAtlas bool
+
 	listeners := make([]*Listener, 0, len(list.Items))
 	for _, item := range list.Items {
 		key := "listener"
@@ -423,10 +426,13 @@ func parseListeners(result *Config, list *ast.ObjectList) error {
 
 		valid := []string{
 			"address",
+			"endpoint",
+			"infrastructure",
 			"tls_disable",
 			"tls_cert_file",
 			"tls_key_file",
 			"tls_min_version",
+			"token",
 		}
 		if err := checkHCLKeys(item.Val, valid); err != nil {
 			return multierror.Prefix(err, fmt.Sprintf("listeners.%s:", key))
@@ -437,8 +443,24 @@ func parseListeners(result *Config, list *ast.ObjectList) error {
 			return multierror.Prefix(err, fmt.Sprintf("listeners.%s:", key))
 		}
 
+		lnType := strings.ToLower(key)
+
+		if lnType == "atlas" {
+			if foundAtlas {
+				return multierror.Prefix(fmt.Errorf("only one listener of type 'atlas' is permitted"), fmt.Sprintf("listeners.%s", key))
+			} else {
+				foundAtlas = true
+				if m["token"] == "" {
+					return multierror.Prefix(fmt.Errorf("'token' must be specified for an Atlas listener"), fmt.Sprintf("listeners.%s", key))
+				}
+				if m["infrastructure"] == "" {
+					return multierror.Prefix(fmt.Errorf("'infrastructure' must be specified for an Atlas listener"), fmt.Sprintf("listeners.%s", key))
+				}
+			}
+		}
+
 		listeners = append(listeners, &Listener{
-			Type:   strings.ToLower(key),
+			Type:   lnType,
 			Config: m,
 		})
 	}