Add a way to record and handle errors

lib/tcp/client/tcpclient.go

@@ -46,6 +46,13 @@ type TCPClient struct {
 	i2ptunnel.I2PTunnelStatus
 	// Channel for shutdown signaling
 	done chan struct{}
+
+	// Error history of the tunnel
+	Errors []i2ptunnel.I2PTunnelError
+}
+
+func (t *TCPClient) recordError(err error) {
+	t.Errors = append(t.Errors, i2ptunnel.NewError(t, err))
 }
 
 // Get the tunnel's I2P address
@@ -55,7 +62,10 @@ func (t *TCPClient) Address() string {
 
 // Get the tunnel's error message
 func (t *TCPClient) Error() error {
-	panic("unimplemented")
+	if len(t.Errors) > 0 {
+		return t.Errors[len(t.Errors)-1]
+	}
+	return nil
 }
 
 // Get the tunnel's local host:port

lib/tcp/server/tcpserver.go

@@ -40,6 +40,13 @@ type TCPServer struct {
 	limitedlistener.LimitedConfig
 	// Channel for shutdown signaling
 	done chan struct{}
+
+	// Error history of the tunnel
+	Errors []i2ptunnel.I2PTunnelError
+}
+
+func (t *TCPServer) recordError(err error) {
+	t.Errors = append(t.Errors, i2ptunnel.NewError(t, err))
 }
 
 // Get the tunnel's I2P address
@@ -49,7 +56,10 @@ func (t *TCPServer) Address() string {
 
 // Get the tunnel's error message
 func (t *TCPServer) Error() error {
-	panic("unimplemented")
+	if len(t.Errors) > 0 {
+		return t.Errors[len(t.Errors)-1]
+	}
+	return nil
 }
 
 // Get the tunnel's local host:port

lib/udp/client/udpclient.go

@@ -48,6 +48,13 @@ type UDPClient struct {
 	i2ptunnel.I2PTunnelStatus
 	// Channel for shutdown signaling
 	done chan struct{}
+
+	// Error history of the tunnel
+	Errors []i2ptunnel.I2PTunnelError
+}
+
+func (u *UDPClient) recordError(err error) {
+	u.Errors = append(u.Errors, i2ptunnel.NewError(u, err))
 }
 
 // Get the tunnel's I2P address
@@ -57,7 +64,10 @@ func (u *UDPClient) Address() string {
 
 // Get the tunnel's error message
 func (u *UDPClient) Error() error {
-	panic("unimplemented")
+	if len(u.Errors) > 0 {
+		return u.Errors[len(u.Errors)-1]
+	}
+	return nil
 }
 
 // Get the tunnel's local host:port

lib/udp/server/udpserver.go

@@ -48,6 +48,13 @@ type UDPServer struct {
 	i2ptunnel.I2PTunnelStatus
 	// Channel for shutdown signaling
 	done chan struct{}
+
+	// Error history of the tunnel
+	Errors []i2ptunnel.I2PTunnelError
+}
+
+func (u *UDPServer) recordError(err error) {
+	u.Errors = append(u.Errors, i2ptunnel.NewError(u, err))
 }
 
 // Get the tunnel's I2P address
@@ -57,7 +64,10 @@ func (u *UDPServer) Address() string {
 
 // Get the tunnel's error message
 func (u *UDPServer) Error() error {
-	panic("unimplemented")
+	if len(u.Errors) > 0 {
+		return u.Errors[len(u.Errors)-1]
+	}
+	return nil
 }
 
 // Get the tunnel's local host:port