added api message options

In case the API message contains option of type deprecated
or in-progress, the information is displayed in the generated
code in a form of additional comment:

// InProgress: <info>
// Deprecated: <info>

In case the <info> is not provided, a generic message is shown.
Possible future use to automatically search whether such
messages are in use.

Change-Id: Icf87cc9a2fe6bf31f7555320255c9f0736add6e1
Signed-off-by: Vladimir Lavor <vlavor@cisco.com>

3 files changed, 62 insertions, 9 deletions

diff --git a/binapigen/generate.go b/binapigen/generate.go
index a2f941a..2ad3eb3 100644
--- a/binapigen/generate.go
+++ b/binapigen/generate.go
@@ -41,6 +41,19 @@ const (
 	fieldUnionData = "XXX_UnionData" // name for the union data field
 )
 
+// option keys
+const (
+	msgStatus     = "status"
+	msgDeprecated = "deprecated"
+	msgInProgress = "in_progress"
+)
+
+// generated option messages
+const (
+	deprecatedMsg = "the message will be removed in the future versions"
+	inProgressMsg = "the message form may change in the future versions"
+)
+
 func GenerateAPI(gen *Generator, file *File) *GenFile {
 	logf("----------------------------")
 	logf(" Generate API - %s", file.Desc.Name)
@@ -145,6 +158,23 @@ func genTypeComment(g *GenFile, goName string, vppName string, objKind string) {
 	g.P("// ", goName, " defines ", objKind, " '", vppName, "'.")
 }
 
+func genTypeOptionComment(g *GenFile, options map[string]string) {
+	// all messages for API versions < 1.0.0 are in_progress by default
+	if msg, ok := options[msgInProgress]; ok || options[msgStatus] == msgInProgress ||
+		len(g.file.Version) > 1 && g.file.Version[0:2] == "0." {
+		if msg == "" {
+			msg = inProgressMsg
+		}
+		g.P("// InProgress: ", msg)
+	}
+	if msg, ok := options[msgDeprecated]; ok || options[msgStatus] == msgDeprecated {
+		if msg == "" {
+			msg = deprecatedMsg
+		}
+		g.P("// Deprecated: ", msg)
+	}
+}
+
 func genEnum(g *GenFile, enum *Enum) {
 	logf("gen ENUM %s (%s) - %d entries", enum.GoName, enum.Name, len(enum.Entries))
 
@@ -453,6 +483,7 @@ func genMessage(g *GenFile, msg *Message) {
 	logf("gen MESSAGE %s (%s) - %d fields", msg.GoName, msg.Name, len(msg.Fields))
 
 	genTypeComment(g, msg.GoIdent.GoName, msg.Name, "message")
+	genTypeOptionComment(g, msg.Options)
 
 	// generate message definition
 	if len(msg.Fields) == 0 {
diff --git a/binapigen/vppapi/api_schema.go b/binapigen/vppapi/api_schema.go
index e1c180e..4dd0ac9 100644
--- a/binapigen/vppapi/api_schema.go
+++ b/binapigen/vppapi/api_schema.go
@@ -62,9 +62,10 @@ type (
 	}
 
 	Message struct {
-		Name   string
-		Fields []Field
-		CRC    string
+		Name    string
+		Fields  []Field
+		CRC     string
+		Options map[string]string
 	}
 
 	Field struct {
diff --git a/binapigen/vppapi/parse_json.go b/binapigen/vppapi/parse_json.go
index a2ca257..ed7bcad 100644
--- a/binapigen/vppapi/parse_json.go
+++ b/binapigen/vppapi/parse_json.go
@@ -46,10 +46,11 @@ const (
 	fileServices   = "services"
 	fileImports    = "imports"
 	// type keys
-	messageCrc  = "crc"
-	enumType    = "enumtype"
-	aliasLength = "length"
-	aliasType   = "type"
+	messageCrc     = "crc"
+	messageOptions = "options"
+	enumType       = "enumtype"
+	aliasLength    = "length"
+	aliasType      = "type"
 	// service
 	serviceReply     = "reply"
 	serviceStream    = "stream"
@@ -375,10 +376,30 @@ func parseMessage(msgNode *jsongo.Node) (*Message, error) {
 	if !ok {
 		return nil, fmt.Errorf("message crc invalid or missing")
 	}
+	var msgOpts map[string]string
+	msgOptsNode := msgNode.At(msgNode.Len() - 1).Map(messageOptions)
+	if msgOptsNode.GetType() == jsongo.TypeMap {
+		msgOpts = make(map[string]string)
+		for _, opt := range msgOptsNode.GetKeys() {
+			if _, ok := opt.(string); !ok {
+				logf("invalid message option key, expected string")
+				continue
+			}
+			msgOpts[opt.(string)] = ""
+			if msgOptsNode.At(opt).Get() != nil {
+				if optMsgStr, ok := msgOptsNode.At(opt).Get().(string); ok {
+					msgOpts[opt.(string)] = optMsgStr
+				} else {
+					logf("invalid message option value, expected string")
+				}
+			}
+		}
+	}
 
 	msg := Message{
-		Name: msgName,
-		CRC:  msgCRC,
+		Name:    msgName,
+		CRC:     msgCRC,
+		Options: msgOpts,
 	}
 
 	// loop through message fields, skip first (name) and last (crc)