/
ws.go
323 lines (267 loc) · 7.28 KB
/
ws.go
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// Copyright 2023 The AthanorLabs/atomic-swap Authors
// SPDX-License-Identifier: LGPL-3.0-only
package rpc
import (
"context"
"fmt"
"net/http"
"time"
"github.com/athanorlabs/atomic-swap/common"
"github.com/athanorlabs/atomic-swap/common/rpctypes"
"github.com/athanorlabs/atomic-swap/common/types"
"github.com/athanorlabs/atomic-swap/common/vjson"
mcrypto "github.com/athanorlabs/atomic-swap/crypto/monero"
"github.com/athanorlabs/atomic-swap/protocol/swap"
ethcommon "github.com/ethereum/go-ethereum/common"
"github.com/gorilla/websocket"
)
var upgrader = websocket.Upgrader{
CheckOrigin: checkOriginFunc,
}
func checkOriginFunc(_ *http.Request) bool {
return true
}
type wsServer struct {
ctx context.Context
sm swap.Manager
ns *NetService
backend ProtocolBackend
taker XMRTaker
}
func newWsServer(ctx context.Context, sm swap.Manager, ns *NetService, backend ProtocolBackend,
taker XMRTaker) *wsServer {
s := &wsServer{
ctx: ctx,
sm: sm,
ns: ns,
backend: backend,
taker: taker,
}
return s
}
// ServeHTTP ...
func (s *wsServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Warnf("failed to update connection to websockets: %s", err)
return
}
defer func() { _ = conn.Close() }()
for {
_, message, err := conn.ReadMessage()
if err != nil {
log.Debugf("failed to read websockets message: %s", err)
break
}
req := new(rpctypes.Request)
err = vjson.UnmarshalStruct(message, req)
if err != nil {
_ = writeError(conn, err)
continue
}
log.Debugf("received message over websockets: %s", message)
err = s.handleRequest(conn, req)
if err != nil {
_ = writeError(conn, err)
}
}
}
func (s *wsServer) handleRequest(conn *websocket.Conn, req *rpctypes.Request) error {
switch req.Method {
case rpctypes.SubscribeSigner:
params := new(rpctypes.SignerRequest)
if err := vjson.UnmarshalStruct(req.Params, params); err != nil {
return fmt.Errorf("failed to unmarshal parameters: %w", err)
}
return s.handleSigner(s.ctx, conn, params.OfferID, params.EthAddress, params.XMRAddress)
case rpctypes.SubscribeSwapStatus:
params := new(rpctypes.SubscribeSwapStatusRequest)
if err := vjson.UnmarshalStruct(req.Params, params); err != nil {
return fmt.Errorf("failed to unmarshal parameters: %w", err)
}
return s.subscribeSwapStatus(s.ctx, conn, params.OfferID)
case rpctypes.SubscribeTakeOffer:
if s.ns == nil {
return errNamespaceNotEnabled
}
params := new(rpctypes.TakeOfferRequest)
if err := vjson.UnmarshalStruct(req.Params, params); err != nil {
return fmt.Errorf("failed to unmarshal parameters: %w", err)
}
err := s.ns.takeOffer(params.PeerID, params.OfferID, params.ProvidesAmount)
if err != nil {
return err
}
return s.subscribeSwapStatus(s.ctx, conn, params.OfferID)
case rpctypes.SubscribeMakeOffer:
if s.ns == nil {
return errNamespaceNotEnabled
}
params := new(rpctypes.MakeOfferRequest)
if err := vjson.UnmarshalStruct(req.Params, params); err != nil {
return fmt.Errorf("failed to unmarshal parameters: %w", err)
}
offerResp, err := s.ns.makeOffer(params)
if err != nil {
return err
}
return s.subscribeMakeOffer(s.ctx, conn, offerResp.OfferID)
default:
return errInvalidMethod
}
}
func (s *wsServer) handleSigner(
ctx context.Context,
conn *websocket.Conn,
offerID types.Hash,
ethAddress ethcommon.Address,
xmrAddr *mcrypto.Address,
) error {
signer, err := s.taker.ExternalSender(offerID)
if err != nil {
return err
}
if err = xmrAddr.ValidateEnv(s.backend.Env()); err != nil {
return err
}
s.backend.ETHClient().SetAddress(ethAddress)
s.backend.SetXMRDepositAddress(xmrAddr, offerID)
defer s.backend.ClearXMRDepositAddress(offerID)
txsOutCh := signer.OngoingCh(offerID)
txsInCh := signer.IncomingCh(offerID)
var timeout time.Duration
switch s.backend.Env() {
case common.Mainnet, common.Stagenet:
timeout = time.Hour
case common.Development:
timeout = time.Minute * 5
}
for {
select {
// TODO: check if conn closes or swap exited (#165)
case <-time.After(timeout):
return fmt.Errorf("signer timed out")
case <-ctx.Done():
return nil
case tx := <-txsOutCh:
log.Debugf("outbound tx: %v", tx)
resp := &rpctypes.SignerResponse{
OfferID: offerID,
To: tx.To,
Data: tx.Data,
Value: tx.Value,
}
err := conn.WriteJSON(resp)
if err != nil {
return err
}
_, message, err := conn.ReadMessage()
if err != nil {
return err
}
params := new(rpctypes.SignerTxSigned)
if err := vjson.UnmarshalStruct(message, ¶ms); err != nil {
return fmt.Errorf("failed to unmarshal parameters: %w", err)
}
if params.OfferID != offerID {
return fmt.Errorf("got unexpected offerID %s, expected %s", params.OfferID, offerID)
}
txsInCh <- params.TxHash
}
}
}
func (s *wsServer) subscribeMakeOffer(
ctx context.Context,
conn *websocket.Conn,
offerID types.Hash,
) error {
resp := &rpctypes.MakeOfferResponse{
PeerID: s.ns.net.PeerID(),
OfferID: offerID,
}
if err := writeResponse(conn, resp); err != nil {
return err
}
statusCh := s.backend.SwapManager().GetStatusChan(offerID)
for {
select {
case status, ok := <-statusCh:
if !ok {
return nil
}
resp := &rpctypes.SubscribeSwapStatusResponse{
Status: status,
}
if err := writeResponse(conn, resp); err != nil {
return err
}
if !status.IsOngoing() {
return nil
}
case <-ctx.Done():
return nil
}
}
}
// subscribeSwapStatus writes the swap's status transitions to the websockets
// connection when the state changes. When the swap completes, it writes the
// final status and then closes the connection. This method is not intended for
// simultaneous requests on the same swap. If more than one request is made
// (including calls to net_[make|take]OfferAndSubscribe), only one of the
// websocket connections will see any individual state transition.
func (s *wsServer) subscribeSwapStatus(ctx context.Context, conn *websocket.Conn, offerID types.Hash) error {
statusCh := s.backend.SwapManager().GetStatusChan(offerID)
if !s.sm.HasOngoingSwap(offerID) {
s.backend.SwapManager().DeleteStatusChan(offerID)
return s.writeSwapExitStatus(conn, offerID)
}
for {
select {
case status, ok := <-statusCh:
if !ok {
return nil
}
resp := &rpctypes.SubscribeSwapStatusResponse{
Status: status,
}
if err := writeResponse(conn, resp); err != nil {
return err
}
if !status.IsOngoing() {
return nil
}
case <-ctx.Done():
return nil
}
}
}
func (s *wsServer) writeSwapExitStatus(conn *websocket.Conn, id types.Hash) error {
info, err := s.sm.GetPastSwap(id)
if err != nil {
return err
}
resp := &rpctypes.SubscribeSwapStatusResponse{
Status: info.Status,
}
return writeResponse(conn, resp)
}
func writeResponse(conn *websocket.Conn, result interface{}) error {
bz, err := vjson.MarshalStruct(result)
if err != nil {
return err
}
resp := &rpctypes.Response{
Version: rpctypes.DefaultJSONRPCVersion,
Result: bz,
}
return conn.WriteJSON(resp)
}
func writeError(conn *websocket.Conn, err error) error {
resp := &rpctypes.Response{
Version: rpctypes.DefaultJSONRPCVersion,
Error: &rpctypes.Error{
Message: err.Error(),
},
}
return conn.WriteJSON(resp)
}