implement a new backoff abstraction (#75)

x/xnet/tcppool.go

@@ -53,6 +53,9 @@ type TCPPoolConfig struct {
 	ClosingTimeout time.Duration
 	// NewUserData is used to create user data used for each individual TCP connection and returned on GetTCP.
 	NewUserData func() any
+	// NewBackoff returns the backoff to use for every newly configured TCP connection.
+	// This should always return a static(non-method) function unless you know what you are doing.
+	NewBackoff func() lneto.BackoffStrategy
 }
 
 func NewTCPPool(cfg TCPPoolConfig) (*TCPPool, error) {
@@ -76,12 +79,16 @@ func NewTCPPool(cfg TCPPoolConfig) (*TCPPool, error) {
 	for i := range pool.conns {
 		bufoff := i * allocPerConn
 		txOff := bufoff + cfg.RxBufSize
-		err := pool.conns[i].Configure(tcp.ConnConfig{
+		conncfg := tcp.ConnConfig{
 			RxBuf:             bufSpace[bufoff:txOff],
 			TxBuf:             bufSpace[txOff : txOff+cfg.TxBufSize],
 			TxPacketQueueSize: cfg.QueueSize,
 			Logger:            cfg.ConnLogger,
-		})
+		}
+		if cfg.NewBackoff != nil {
+			conncfg.RWBackoff = cfg.NewBackoff()
+		}
+		err := pool.conns[i].Configure(conncfg)
 		if err != nil {
 			return nil, err
 		}