matriochka start send and route + doc upt

client/matriochka.go

@@ -0,0 +1,51 @@
+package client
+
+import (
+	"forge.redroom.link/yves/meowlib"
+	"github.com/google/uuid"
+)
+
+func ProcessForOutput(usermessage *meowlib.UserMessage, peer *Peer, servers *InternalServerList, trackingLookupKey string) ([]byte, error) {
+	lastIdx := len(servers.Servers) - 1
+	// LAST SERVER : Message delivery as usual
+	srv := &servers.Servers[lastIdx]
+	// Prepare cyphered + packed user message
+	packedMsg, err := peer.ProcessOutboundUserMessage(usermessage)
+	if err != nil {
+		return nil, err
+	}
+	// Creating Server message for transporting the user message
+	toServerMessage := srv.BuildToServerMessageFromUserMessage(packedMsg)
+	lastmsg, err := srv.ProcessOutboundMessage(toServerMessage)
+	if err != nil {
+		return nil, err
+	}
+	lastuuid := uuid.NewString()
+	// ALL PREVIOUS SERVERS
+	for i := lastIdx - 1; i >= 0; i-- {
+		srv = &servers.Servers[i]
+		var toServerMessage meowlib.ToServerMessage
+		toServerMessage.MatriochkaMessage.Data = lastmsg
+		toServerMessage.MatriochkaMessage.Next.Url = servers.Servers[i+1].ServerData.Url
+		toServerMessage.MatriochkaMessage.Next.PublicKey = servers.Servers[i+1].ServerData.PublicKey
+		toServerMessage.MatriochkaMessage.Next.Delay = int32(servers.Servers[i+1].AllowedDelay)
+		if trackingLookupKey != "" {
+			toServerMessage.MatriochkaMessage.Next.Uuid = lastuuid // change tracking uuid at each server
+			if i > 0 {
+				toServerMessage.MatriochkaMessage.Prev.Url = servers.Servers[i-1].ServerData.Url
+				toServerMessage.MatriochkaMessage.Prev.PublicKey = servers.Servers[i+1].ServerData.PublicKey
+				toServerMessage.MatriochkaMessage.Prev.Delay = int32(servers.Servers[i-1].AllowedDelay)
+				toServerMessage.MatriochkaMessage.Prev.Uuid = uuid.NewString()
+				lastuuid = toServerMessage.MatriochkaMessage.Prev.Uuid
+			} else { // for first message, no previous tracking but a lookupkey to stack the tracking messages
+				toServerMessage.MatriochkaMessage.LookupKey = trackingLookupKey
+			}
+		}
+		lastmsg, err = srv.ProcessOutboundMessage(&toServerMessage)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return lastmsg, nil
+}