Added TCP support

Signed-off-by: Chaitanya Munukutla <[email protected]>

README.md

@@ -1,7 +1,9 @@
 # microq
-A tiny Websocket-based event broker.
+A tiny event broker.
 
 ## Features
+- [x] Websocket support
+- [x] TCP support
 - [x] Grouped subscriptions
 - [ ] Offline messages
 - [ ] Clustering

broker/broker.go

@@ -7,9 +7,8 @@ import (
 	"sync"
 )
 
-type WebSocketConnection interface {
-	WriteMessage(messageType int, data []byte) error
-	ReadMessage() (messageType int, p []byte, err error)
+type GenericConnection interface {
+	WriteMessage(data []byte) error
 }
 
 type Broker struct {

broker/client.go

@@ -2,19 +2,18 @@ package broker
 
 import (
 	"encoding/json"
-	"github.com/gorilla/websocket"
 	"sync"
 )
 
 type ConnectedClient struct {
 	id              string
 	subscriptions   []*Subscription
 	unsubscriptions []*Subscription
-	conn            WebSocketConnection
+	conn            GenericConnection
 	mutex           sync.RWMutex
 }
 
-func NewConnectedClient(conn WebSocketConnection, id string) *ConnectedClient {
+func NewConnectedClient(conn GenericConnection, id string) *ConnectedClient {
 	return &ConnectedClient{
 		id:              id,
 		conn:            conn,
@@ -24,11 +23,15 @@ func NewConnectedClient(conn WebSocketConnection, id string) *ConnectedClient {
 	}
 }
 
+func (client *ConnectedClient) SetId(id string) {
+	client.id = id
+}
+
 func (client *ConnectedClient) WriteDataMessage(data []byte) error {
 	client.mutex.Lock()
 	defer client.mutex.Unlock()
 
-	return client.conn.WriteMessage(websocket.TextMessage, data)
+	return client.conn.WriteMessage(data)
 }
 
 func (client *ConnectedClient) WriteInterface(v any) error {

conn/tcp.go

@@ -0,0 +1,16 @@
+package conn
+
+import "net"
+
+type TCPConnection struct {
+	conn *net.TCPConn
+}
+
+func NewTCPConnection(conn *net.TCPConn) *TCPConnection {
+	return &TCPConnection{conn: conn}
+}
+
+func (tc *TCPConnection) WriteMessage(data []byte) error {
+	_, err := tc.conn.Write(data)
+	return err
+}

conn/ws.go

@@ -0,0 +1,15 @@
+package conn
+
+import "github.com/gorilla/websocket"
+
+type WebsocketConnection struct {
+	conn *websocket.Conn
+}
+
+func NewWebsocketConnection(conn *websocket.Conn) *WebsocketConnection {
+	return &WebsocketConnection{conn: conn}
+}
+
+func (wc *WebsocketConnection) WriteMessage(data []byte) error {
+	return wc.conn.WriteMessage(websocket.TextMessage, data)
+}

events/conn.go

@@ -0,0 +1,8 @@
+package events
+
+const Conn = "conn"
+
+type ConnEvent struct {
+	Kind     string `json:"kind"`
+	ClientId string `json:"client_id"`
+}

events/connack.go

@@ -0,0 +1,9 @@
+package events
+
+const ConnAck = "connack"
+
+type ConnAckEvent struct {
+	Kind     string `json:"kind"`
+	ClientId string `json:"client_id"`
+	Status   bool   `json:"status"`
+}

handlers/base.go

@@ -17,6 +17,8 @@ func HandleMessage(client *broker.ConnectedClient, broker *broker.Broker, sp sto
 		return handleSubscribe(message, client)
 	case events.Unsub:
 		return handleUnsubscribe(message, client)
+	case events.Conn:
+		return handleConn(message, client)
 	}
 	return nil
 }

handlers/conn.go

@@ -0,0 +1,23 @@
+package handlers
+
+import (
+	"encoding/json"
+	"github.com/c16a/microq/broker"
+	"github.com/c16a/microq/events"
+)
+
+func handleConn(message []byte, client *broker.ConnectedClient) error {
+	var event events.ConnEvent
+	err := json.Unmarshal(message, &event)
+	if err != nil {
+		return err
+	}
+
+	client.SetId(event.ClientId)
+	subackEvent := &events.ConnAckEvent{
+		Kind:     events.ConnAck,
+		Status:   true,
+		ClientId: event.ClientId,
+	}
+	return client.WriteInterface(subackEvent)
+}

main.go

@@ -1,11 +1,14 @@
 package main
 
 import (
+	"bufio"
 	"github.com/c16a/microq/broker"
+	"github.com/c16a/microq/conn"
 	"github.com/c16a/microq/handlers"
 	"github.com/c16a/microq/storage"
 	"github.com/gorilla/websocket"
 	"log"
+	"net"
 	"net/http"
 )
 
@@ -14,6 +17,40 @@ func main() {
 	defer storageProvider.Close()
 
 	b := broker.NewBroker()
+	go runWebSocketInterface(b, storageProvider)
+	log.Fatal(runTcpInterface(b, storageProvider))
+}
+
+func runTcpInterface(b *broker.Broker, storageProvider storage.Provider) error {
+	listener, err := net.ListenTCP("tcp", &net.TCPAddr{Port: 8081})
+	if err != nil {
+		return err
+	}
+
+	for {
+		// Handles one TCP client
+		c, err := listener.AcceptTCP()
+		if err != nil {
+			continue
+		}
+
+		scanner := bufio.NewScanner(c)
+
+		for scanner.Scan() {
+			line := scanner.Text()
+
+			tcpConn := conn.NewTCPConnection(c)
+			client := broker.NewConnectedClient(tcpConn, "unlabeled")
+
+			err = handlers.HandleMessage(client, b, storageProvider, []byte(line))
+			if err != nil {
+				continue
+			}
+		}
+	}
+}
+
+func runWebSocketInterface(b *broker.Broker, storageProvider storage.Provider) {
 	var upgrader = websocket.Upgrader{}
 	http.HandleFunc("/echo", echo(upgrader, b, storageProvider))
 
@@ -30,7 +67,8 @@ func echo(upgrader websocket.Upgrader, b *broker.Broker, sp storage.Provider) fu
 
 		clientId := request.Header.Get("Client-Id")
 
-		client := broker.NewConnectedClient(c, clientId)
+		wsConn := conn.NewWebsocketConnection(c)
+		client := broker.NewConnectedClient(wsConn, clientId)
 		b.Connect(clientId, client)
 
 		for {