Implement direct messaging

Makefile

@@ -0,0 +1,5 @@
+generate-id:
+	go run cmd/generate-id/main.go
+
+clean: 
+	rm -rf tmp

pkg/messaging/point2point.go

@@ -0,0 +1,46 @@
+package messaging
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/nats-io/nats.go"
+)
+
+type DirectMessaging interface {
+	Listen(target string, handler func(data []byte)) error
+	Send(target string, data []byte) error
+}
+
+type natsDirectMessaging struct {
+	natsConn *nats.Conn
+	ch       chan []byte
+}
+
+func newNatsDirectMessaging(natsConn *nats.Conn) DirectMessaging {
+	return &natsDirectMessaging{
+		natsConn: natsConn,
+		ch:       make(chan []byte),
+	}
+}
+
+func (d *natsDirectMessaging) Send(id string, message []byte) error {
+	msg, err := d.natsConn.Request(id, message, time.Second)
+	if err != nil {
+		return err
+	}
+	fmt.Printf("msg = %+v\n", msg)
+	return nil
+}
+
+func (d *natsDirectMessaging) Listen(id string, handler func(data []byte)) error {
+	_, err := d.natsConn.Subscribe(id, func(m *nats.Msg) {
+		d.ch <- m.Data
+		handler(m.Data)
+		m.Respond([]byte("OK"))
+	})
+	if err != nil {
+		return err
+	}
+	return nil
+}

pkg/messaging/pubsub.go

@@ -1,4 +1,4 @@
-package infra
+package messaging
 
 import (
 	"github.com/nats-io/nats.go"

pkg/node/node.go

@@ -0,0 +1,27 @@
+package node
+
+import "github.com/cryptoniumX/mpcium/pkg/messaging"
+
+type ID string
+
+type Party struct {
+	id      string
+	peerIDs []string
+
+	pubSub messaging.PubSub
+	direct messaging.DirectMessaging
+}
+
+func NewParty(
+	id string,
+	peerIDs []string,
+	pubSub messaging.PubSub,
+	direct messaging.DirectMessaging,
+) *Party {
+	return &Party{
+		id:      id,
+		peerIDs: peerIDs,
+		pubSub:  pubSub,
+		direct:  direct,
+	}
+}