updated protobufs, added some helpers

client/Client.go

@@ -2,8 +2,6 @@
 package client
 
 import (
-	"time"
-
 	"github.com/golang/protobuf/proto"
 	"github.com/status-im/dasy/protobuf"
 	mvds "github.com/status-im/mvds/node"
@@ -16,6 +14,8 @@ type Chat state.GroupID
 // Client is the actual daisy client.
 type Client struct {
 	node mvds.Node
+
+	lastMessage protobuf.MessageID
 }
 
 // Invite invites a peer to a chat.
@@ -44,23 +44,22 @@ func (c *Client) Ack(chat Chat, messageID []byte) {
 }
 
 // Post sends a message to a chat.
-func (c *Client) Post(chat Chat, body []byte) {
-	c.send(chat, protobuf.Message_POST, body) // @todo
+func (c *Client) Post(chat Chat, body []byte) error {
+	return c.send(chat, protobuf.Message_POST, body)
 }
 
 func (c *Client) send(chat Chat, t protobuf.Message_MessageType, body []byte) error {
 	msg := &protobuf.Message{
-		Clock: 0,
-		Timestamp: uint64(time.Now().Unix()), // @todo we may be able to take this from mvds
-		MessageType: protobuf.Message_MessageType(t),
-		Body: body,
+		MessageType:     protobuf.Message_MessageType(t),
+		Body:            body,
+		PreviousMessage: c.lastMessage[:],
 	}
 
 	// @todo sign
 
 	buf, err := proto.Marshal(msg)
 	if err != nil {
-		return  err
+		return err
 	}
 
 	_, err = c.node.AppendMessage(state.GroupID(chat), buf)
@@ -68,5 +67,7 @@ func (c *Client) send(chat Chat, t protobuf.Message_MessageType, body []byte) er
 		return err
 	}
 
+	c.lastMessage = msg.ID()
+
 	return nil
 }