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package network
import (
"bufio"
"encoding/json"
"fmt"
"net"
"sync"
"time"
"github.com/boozec/rahanna/internal/logger"
"go.uber.org/zap"
)
// PeerInfo represents a peer's ID and IP.
type PeerInfo struct {
ID string `json:"id"`
IP string `json:"ip"`
Port int `json:"port"`
}
// Message represents a structured message.
type Message struct {
Type string `json:"type"`
Payload []byte `json:"payload"`
Source PeerInfo `json:"source"`
Target PeerInfo `json:"target"`
Timestamp int64 `json:"timestamp"`
}
type NetworkCallback func(msg Message)
// TCPNetwork represents a full-duplex TCP peer.
type TCPNetwork struct {
localPeer PeerInfo
connections map[string]net.Conn
listener net.Listener
callbacks map[string]NetworkCallback
callbacksMu sync.RWMutex
isConnected bool
retryDelay time.Duration
logger *zap.Logger
sync.Mutex
}
// initializes a TCP peer
func NewTCPNetwork(localID, localIP string, localPort int, onReceive func()) *TCPNetwork {
n := &TCPNetwork{
localPeer: PeerInfo{ID: localID, IP: localIP, Port: localPort},
connections: make(map[string]net.Conn),
callbacks: make(map[string]NetworkCallback),
isConnected: false,
retryDelay: 2 * time.Second,
logger: logger.InitLogger("rahanna.log"),
}
go n.startServer(onReceive)
return n
}
// Add a new peer connection to the local peer
func (n *TCPNetwork) AddPeer(remoteID string, remoteIP string, remotePort int) {
go n.retryConnect(remoteID, remoteIP, remotePort)
}
// startServer starts a TCP server to accept connections.
func (n *TCPNetwork) startServer(callback func()) {
address := fmt.Sprintf("%s:%d", n.localPeer.IP, n.localPeer.Port)
listener, err := net.Listen("tcp", address)
if err != nil {
n.logger.Sugar().Errorf("failed to start server: %v", err)
return
}
n.listener = listener
n.logger.Sugar().Infof("server started on %s\n", address)
for {
conn, err := listener.Accept()
if err != nil {
n.logger.Sugar().Errorf("failed to accept connection: %v\n", err)
continue
}
remoteAddr := conn.RemoteAddr().String()
n.Lock()
n.connections[remoteAddr] = conn
callback()
n.Unlock()
n.isConnected = true
n.retryDelay = 2 * time.Second
n.logger.Sugar().Infof("connected to remote peer %s\n", remoteAddr)
go n.listenForMessages(conn)
}
}
// retryConnect attempts to connect to a remote peer.
func (n *TCPNetwork) retryConnect(remoteID, remoteIP string, remotePort int) {
for {
n.Lock()
_, exists := n.connections[remoteID]
n.Unlock()
if exists {
time.Sleep(5 * time.Second)
continue
}
address := fmt.Sprintf("%s:%d", remoteIP, remotePort)
conn, err := net.Dial("tcp", address)
if err != nil {
n.logger.Sugar().Errorf("failed to connect to %s: %v. Retrying in %v...", remoteID, err, n.retryDelay)
time.Sleep(n.retryDelay)
if n.retryDelay < 30*time.Second {
n.retryDelay *= 2
}
continue
}
n.Lock()
n.connections[remoteID] = conn
n.Unlock()
n.logger.Sugar().Infof("successfully connected to peer %s!", remoteID)
go n.listenForMessages(conn)
}
}
// Send sends a message to a specified remote peer.
func (n *TCPNetwork) Send(remoteID, messageType string, payload []byte) error {
n.Lock()
conn, exists := n.connections[remoteID]
n.Unlock()
if !exists {
return fmt.Errorf("not connected to peer %s", remoteID)
}
msg := Message{
Type: messageType,
Payload: payload,
Source: n.localPeer,
Target: PeerInfo{ID: remoteID},
Timestamp: time.Now().Unix(),
}
data, err := json.Marshal(msg)
if err != nil {
return fmt.Errorf("failed to marshal message: %v", err)
}
_, err = conn.Write(append(data, '\n'))
if err != nil {
n.logger.Sugar().Errorf("failed to send message to %s: %v. Reconnecting...", remoteID, err)
n.Lock()
delete(n.connections, remoteID)
n.Unlock()
go n.retryConnect(remoteID, "", 0)
return fmt.Errorf("failed to send message: %v", err)
}
return nil
}
// RegisterHandler registers a callback for a message type.
func (n *TCPNetwork) RegisterHandler(messageType string, callback NetworkCallback) {
n.callbacksMu.Lock()
n.callbacks[messageType] = callback
n.callbacksMu.Unlock()
}
// listenForMessages listens for incoming messages.
func (n *TCPNetwork) listenForMessages(conn net.Conn) {
reader := bufio.NewReader(conn)
for {
data, err := reader.ReadBytes('\n')
if err != nil {
n.logger.Debug("connection lost. Reconnecting...")
n.Lock()
for id, c := range n.connections {
if c == conn {
delete(n.connections, id)
go n.retryConnect(id, "", 0)
break
}
}
n.Unlock()
return
}
var message Message
if err := json.Unmarshal(data, &message); err != nil {
n.logger.Sugar().Errorf("failed to unmarshal message: %v\n", err)
continue
}
n.callbacksMu.RLock()
callback, exists := n.callbacks[message.Type]
n.callbacksMu.RUnlock()
if exists {
go callback(message)
}
}
}
func (n *TCPNetwork) IsConnected() bool {
n.Lock()
defer n.Unlock()
return n.isConnected
}
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