forked from DavidAJohnston/mastercoind
/
rpcwebsocket.go
768 lines (668 loc) · 21 KB
/
rpcwebsocket.go
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// Copyright (c) 2013-2014 Conformal Systems LLC.
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package main
import (
"bytes"
"code.google.com/p/go.net/websocket"
"container/list"
"encoding/hex"
"encoding/json"
"fmt"
"github.com/conformal/btcdb"
"github.com/conformal/btcjson"
"github.com/conformal/btcscript"
"github.com/conformal/btcutil"
"github.com/conformal/btcwire"
"github.com/conformal/btcws"
"sync"
)
type walletChan chan []byte
type wsCommandHandler func(*rpcServer, btcjson.Cmd, walletChan) error
// wsHandlers maps RPC command strings to appropriate websocket handler
// functions.
var wsHandlers = map[string]wsCommandHandler{
"getcurrentnet": handleGetCurrentNet,
"getbestblock": handleGetBestBlock,
"notifynewtxs": handleNotifyNewTXs,
"notifyspent": handleNotifySpent,
"rescan": handleRescan,
"sendrawtransaction:": handleWalletSendRawTransaction,
}
// wsContext holds the items the RPC server needs to handle websocket
// connections for wallets.
type wsContext struct {
sync.RWMutex
// connections holds a map of requests for each wallet using the
// wallet channel as the key.
connections map[walletChan]*requestContexts
// Any chain notifications meant to be received by every connected
// wallet are sent across this channel.
walletNotificationMaster walletChan
// Map of address hash to list of notificationCtx. This is the global
// list we actually use for notifications, we also keep a list in the
// requestContexts to make removal from this list on connection close
// less horrendously expensive.
txNotifications map[string]*list.List
// Map of outpoint to list of notificationCtx.
spentNotifications map[btcwire.OutPoint]*list.List
// Map of shas to list of notificationCtx.
minedTxNotifications map[btcwire.ShaHash]*list.List
}
// AddTxRequest adds the request context for new transaction notifications.
func (r *wsContext) AddTxRequest(wallet walletChan, addr string) {
r.Lock()
defer r.Unlock()
clist, ok := r.txNotifications[addr]
if !ok {
clist = list.New()
r.txNotifications[addr] = clist
}
clist.PushBack(wallet)
rc := r.connections[wallet]
rc.txRequests[addr] = struct{}{}
}
func (r *wsContext) removeGlobalTxRequest(wallet walletChan, addr string) {
clist := r.txNotifications[addr]
var enext *list.Element
for e := clist.Front(); e != nil; e = enext {
enext = e.Next()
c := e.Value.(walletChan)
if c == wallet {
clist.Remove(e)
break
}
}
if clist.Len() == 0 {
delete(r.txNotifications, addr)
}
}
// AddSpentRequest adds a request context for notifications of a spent
// Outpoint.
func (r *wsContext) AddSpentRequest(wallet walletChan, op *btcwire.OutPoint) {
r.Lock()
defer r.Unlock()
clist, ok := r.spentNotifications[*op]
if !ok {
clist = list.New()
r.spentNotifications[*op] = clist
}
clist.PushBack(wallet)
rc := r.connections[wallet]
rc.spentRequests[*op] = struct{}{}
}
func (r *wsContext) removeGlobalSpentRequest(wallet walletChan, op *btcwire.OutPoint) {
clist := r.spentNotifications[*op]
var enext *list.Element
for e := clist.Front(); e != nil; e = enext {
enext = e.Next()
c := e.Value.(walletChan)
if c == wallet {
clist.Remove(e)
break
}
}
if clist.Len() == 0 {
delete(r.spentNotifications, *op)
}
}
// RemoveSpentRequest removes a request context for notifications of a
// spent Outpoint.
func (r *wsContext) RemoveSpentRequest(wallet walletChan, op *btcwire.OutPoint) {
r.Lock()
defer r.Unlock()
r.removeGlobalSpentRequest(wallet, op)
rc := r.connections[wallet]
delete(rc.spentRequests, *op)
}
// AddMinedTxRequest adds request contexts for notifications of a
// mined transaction.
func (r *wsContext) AddMinedTxRequest(wallet walletChan, txID *btcwire.ShaHash) {
r.Lock()
defer r.Unlock()
clist, ok := r.minedTxNotifications[*txID]
if !ok {
clist = list.New()
r.minedTxNotifications[*txID] = clist
}
clist.PushBack(wallet)
rc := r.connections[wallet]
rc.minedTxRequests[*txID] = struct{}{}
}
func (r *wsContext) removeGlobalMinedTxRequest(wallet walletChan, txID *btcwire.ShaHash) {
clist := r.minedTxNotifications[*txID]
var enext *list.Element
for e := clist.Front(); e != nil; e = enext {
enext = e.Next()
c := e.Value.(walletChan)
if c == wallet {
clist.Remove(e)
break
}
}
if clist.Len() == 0 {
delete(r.minedTxNotifications, *txID)
}
}
// RemoveMinedTxRequest removes request contexts for notifications of a
// mined transaction.
func (r *wsContext) RemoveMinedTxRequest(wallet walletChan, txID *btcwire.ShaHash) {
r.Lock()
defer r.Unlock()
r.removeMinedTxRequest(wallet, txID)
}
// removeMinedTxRequest removes request contexts for notifications of a
// mined transaction without grabbing any locks.
func (r *wsContext) removeMinedTxRequest(wallet walletChan, txID *btcwire.ShaHash) {
r.removeGlobalMinedTxRequest(wallet, txID)
rc := r.connections[wallet]
delete(rc.minedTxRequests, *txID)
}
// CloseListeners removes all request contexts for notifications sent
// to a wallet notification channel and closes the channel to stop all
// goroutines currently serving that wallet.
func (r *wsContext) CloseListeners(wallet walletChan) {
r.Lock()
defer r.Unlock()
delete(r.connections, wallet)
close(wallet)
}
// requestContexts holds all requests for a single wallet connection.
type requestContexts struct {
// txRequests is a set of addresses a wallet has requested transactions
// updates for. It is maintained here so all requests can be removed
// when a wallet disconnects.
txRequests map[string]struct{}
// spentRequests is a set of unspent Outpoints a wallet has requested
// notifications for when they are spent by a processed transaction.
spentRequests map[btcwire.OutPoint]struct{}
// minedTxRequests holds a set of transaction IDs (tx hashes) of
// transactions created by a wallet. A wallet may request
// notifications of when a tx it created is mined into a block and
// removed from the mempool. Once a tx has been mined into a
// block, wallet may remove the raw transaction from its unmined tx
// pool.
minedTxRequests map[btcwire.ShaHash]struct{}
}
// respondToAnyCmd checks that a parsed command is a standard or
// extension JSON-RPC command and runs the proper handler to reply to
// the command. Any and all responses are sent to the wallet from
// this function.
func respondToAnyCmd(cmd btcjson.Cmd, s *rpcServer, wallet walletChan) {
// Lookup the websocket extension for the command and if it doesn't
// exist fallback to handling the command as a standard command.
wsHandler, ok := wsHandlers[cmd.Method()]
if !ok {
reply := standardCmdReply(cmd, s)
mreply, _ := json.Marshal(reply)
wallet <- mreply
return
}
// Call the appropriate handler which responds unless there was an
// error in which case the error is marshalled and sent here.
if err := wsHandler(s, cmd, wallet); err != nil {
var reply btcjson.Reply
jsonErr, ok := err.(btcjson.Error)
if ok {
reply.Error = &jsonErr
mreply, _ := json.Marshal(reply)
wallet <- mreply
return
}
// In the case where we did not have a btcjson
// error to begin with, make a new one to send,
// but this really should not happen.
jsonErr = btcjson.Error{
Code: btcjson.ErrInternal.Code,
Message: err.Error(),
}
reply.Error = &jsonErr
mreply, _ := json.Marshal(reply)
wallet <- mreply
}
}
// handleGetCurrentNet implements the getcurrentnet command extension
// for websocket connections.
func handleGetCurrentNet(s *rpcServer, cmd btcjson.Cmd, wallet walletChan) error {
id := cmd.Id()
reply := &btcjson.Reply{Id: &id}
var net btcwire.BitcoinNet
if cfg.TestNet3 {
net = btcwire.TestNet3
} else {
net = btcwire.MainNet
}
reply.Result = float64(net)
mreply, _ := json.Marshal(reply)
wallet <- mreply
return nil
}
// handleGetBestBlock implements the getbestblock command extension
// for websocket connections.
func handleGetBestBlock(s *rpcServer, cmd btcjson.Cmd, wallet walletChan) error {
id := cmd.Id()
reply := &btcjson.Reply{Id: &id}
// All other "get block" commands give either the height, the
// hash, or both but require the block SHA. This gets both for
// the best block.
sha, height, err := s.server.db.NewestSha()
if err != nil {
return btcjson.ErrBestBlockHash
}
reply.Result = map[string]interface{}{
"hash": sha.String(),
"height": height,
}
mreply, _ := json.Marshal(reply)
wallet <- mreply
return nil
}
// handleNotifyNewTXs implements the notifynewtxs command extension for
// websocket connections.
func handleNotifyNewTXs(s *rpcServer, cmd btcjson.Cmd, wallet walletChan) error {
id := cmd.Id()
reply := &btcjson.Reply{Id: &id}
notifyCmd, ok := cmd.(*btcws.NotifyNewTXsCmd)
if !ok {
return btcjson.ErrInternal
}
for _, addr := range notifyCmd.Addresses {
addr, err := btcutil.DecodeAddr(addr)
if err != nil {
return fmt.Errorf("cannot decode address: %v", err)
}
// TODO(jrick) Notifing for non-P2PKH addresses is currently
// unsuported.
if _, ok := addr.(*btcutil.AddressPubKeyHash); !ok {
return fmt.Errorf("address is not P2PKH: %v", addr.EncodeAddress())
}
s.ws.AddTxRequest(wallet, addr.EncodeAddress())
}
mreply, _ := json.Marshal(reply)
wallet <- mreply
return nil
}
// handleNotifySpent implements the notifyspent command extension for
// websocket connections.
func handleNotifySpent(s *rpcServer, cmd btcjson.Cmd, wallet walletChan) error {
id := cmd.Id()
reply := &btcjson.Reply{Id: &id}
notifyCmd, ok := cmd.(*btcws.NotifySpentCmd)
if !ok {
return btcjson.ErrInternal
}
s.ws.AddSpentRequest(wallet, notifyCmd.OutPoint)
mreply, _ := json.Marshal(reply)
wallet <- mreply
return nil
}
// handleRescan implements the rescan command extension for websocket
// connections.
func handleRescan(s *rpcServer, cmd btcjson.Cmd, wallet walletChan) error {
rescanCmd, ok := cmd.(*btcws.RescanCmd)
if !ok {
return btcjson.ErrInternal
}
if len(rescanCmd.Addresses) == 1 {
rpcsLog.Info("Beginning rescan for 1 address.")
} else {
rpcsLog.Infof("Beginning rescan for %v addresses.",
len(rescanCmd.Addresses))
}
minblock := int64(rescanCmd.BeginBlock)
maxblock := int64(rescanCmd.EndBlock)
// FetchHeightRange may not return a complete list of block shas for
// the given range, so fetch range as many times as necessary.
for {
blkshalist, err := s.server.db.FetchHeightRange(minblock,
maxblock)
if err != nil {
return err
}
if len(blkshalist) == 0 {
break
}
for i := range blkshalist {
blk, err := s.server.db.FetchBlockBySha(&blkshalist[i])
if err != nil {
rpcsLog.Errorf("Error looking up block sha: %v",
err)
return err
}
for _, tx := range blk.Transactions() {
var txReply *btcdb.TxListReply
txouts:
for txOutIdx, txout := range tx.MsgTx().TxOut {
_, addrs, _, err := btcscript.ExtractPkScriptAddrs(
txout.PkScript, s.server.btcnet)
if err != nil {
continue txouts
}
for i, addr := range addrs {
encodedAddr := addr.EncodeAddress()
if _, ok := rescanCmd.Addresses[encodedAddr]; ok {
// TODO(jrick): This lookup is expensive and can be avoided
// if the wallet is sent the previous outpoints for all inputs
// of the tx, so any can removed from the utxo set (since
// they are, as of this tx, now spent).
if txReply == nil {
txReplyList, err := s.server.db.FetchTxBySha(tx.Sha())
if err != nil {
rpcsLog.Errorf("Tx Sha %v not found by db.", tx.Sha())
continue txouts
}
for i := range txReplyList {
if txReplyList[i].Height == blk.Height() {
txReply = txReplyList[i]
break
}
}
}
ntfn := &btcws.ProcessedTxNtfn{
Receiver: encodedAddr,
Amount: txout.Value,
TxID: tx.Sha().String(),
TxOutIndex: uint32(txOutIdx),
PkScript: hex.EncodeToString(txout.PkScript),
BlockHash: blkshalist[i].String(),
BlockHeight: int32(blk.Height()),
BlockIndex: tx.Index(),
BlockTime: blk.MsgBlock().Header.Timestamp.Unix(),
Spent: txReply.TxSpent[txOutIdx],
}
mntfn, _ := ntfn.MarshalJSON()
wallet <- mntfn
}
}
}
}
}
if maxblock-minblock > int64(len(blkshalist)) {
minblock += int64(len(blkshalist))
} else {
break
}
}
rpcsLog.Info("Finished rescan")
id := cmd.Id()
response := &btcjson.Reply{
Id: &id,
Result: nil,
Error: nil,
}
mresponse, _ := json.Marshal(response)
wallet <- mresponse
return nil
}
// handleWalletSendRawTransaction implements the websocket extended version of
// the sendrawtransaction command.
func handleWalletSendRawTransaction(s *rpcServer, cmd btcjson.Cmd, wallet walletChan) error {
result, err := handleSendRawTransaction(s, cmd)
if err != nil {
return err
}
// The result is already guaranteed to be a valid hash string if no
// error was returned above, so it's safe to ignore the error here.
txSha, _ := btcwire.NewShaHashFromStr(result.(string))
// Request to be notified when the transaction is mined.
s.ws.AddMinedTxRequest(wallet, txSha)
return nil
}
// AddWalletListener adds a channel to listen for new messages from a
// wallet.
func (s *rpcServer) AddWalletListener(c walletChan) {
s.ws.Lock()
rc := &requestContexts{
txRequests: make(map[string]struct{}),
spentRequests: make(map[btcwire.OutPoint]struct{}),
minedTxRequests: make(map[btcwire.ShaHash]struct{}),
}
s.ws.connections[c] = rc
s.ws.Unlock()
}
// RemoveWalletListener removes a wallet listener channel.
func (s *rpcServer) RemoveWalletListener(c walletChan) {
s.ws.Lock()
rc := s.ws.connections[c]
for k := range rc.txRequests {
s.ws.removeGlobalTxRequest(c, k)
}
for k := range rc.spentRequests {
s.ws.removeGlobalSpentRequest(c, &k)
}
for k := range rc.minedTxRequests {
s.ws.removeGlobalMinedTxRequest(c, &k)
}
delete(s.ws.connections, c)
s.ws.Unlock()
}
// walletListenerDuplicator listens for new wallet listener channels
// and duplicates messages sent to walletNotificationMaster to all
// connected listeners.
func (s *rpcServer) walletListenerDuplicator() {
// Duplicate all messages sent across walletNotificationMaster to each
// listening wallet.
for {
select {
case ntfn := <-s.ws.walletNotificationMaster:
s.ws.RLock()
for c := range s.ws.connections {
c <- ntfn
}
s.ws.RUnlock()
case <-s.quit:
return
}
}
}
// walletReqsNotifications is the handler function for websocket
// connections from a btcwallet instance. It reads messages from wallet and
// sends back replies, as well as notififying wallets of chain updates.
func (s *rpcServer) walletReqsNotifications(ws *websocket.Conn) {
// Add wallet notification channel so this handler receives btcd chain
// notifications.
c := make(walletChan)
s.AddWalletListener(c)
defer s.RemoveWalletListener(c)
// msgs is a channel for all messages received over the websocket.
msgs := make(chan []byte)
// Receive messages from websocket and send across reqs until the
// connection is lost.
go func() {
for {
select {
case <-s.quit:
close(msgs)
return
default:
var m []byte
if err := websocket.Message.Receive(ws, &m); err != nil {
close(msgs)
return
}
msgs <- m
}
}
}()
for {
select {
case m, ok := <-msgs:
if !ok {
// Wallet disconnected.
return
}
// Handle request here.
go s.websocketJSONHandler(c, m)
case ntfn, _ := <-c:
// Send btcd notification to btcwallet instance over
// websocket.
if err := websocket.Message.Send(ws, ntfn); err != nil {
// Wallet disconnected.
return
}
case <-s.quit:
// Server closed.
return
}
}
}
// websocketJSONHandler parses and handles a marshalled json message,
// sending the marshalled reply to a wallet notification channel.
func (s *rpcServer) websocketJSONHandler(wallet walletChan, msg []byte) {
s.wg.Add(1)
defer s.wg.Done()
cmd, jsonErr := parseCmd(msg)
if jsonErr != nil {
var reply btcjson.Reply
if cmd != nil {
// Unmarshaling at least a valid JSON-RPC message succeeded.
// Use the provided id for errors.
id := cmd.Id()
reply.Id = &id
}
reply.Error = jsonErr
mreply, _ := json.Marshal(reply)
wallet <- mreply
return
}
respondToAnyCmd(cmd, s, wallet)
}
// NotifyBlockConnected creates and marshalls a JSON message to notify
// of a new block connected to the main chain. The notification is sent
// to each connected wallet.
func (s *rpcServer) NotifyBlockConnected(block *btcutil.Block) {
hash, err := block.Sha()
if err != nil {
rpcsLog.Error("Bad block; connected block notification dropped.")
return
}
// TODO: remove int32 type conversion.
ntfn := btcws.NewBlockConnectedNtfn(hash.String(),
int32(block.Height()))
mntfn, _ := json.Marshal(ntfn)
s.ws.walletNotificationMaster <- mntfn
// Inform any interested parties about txs mined in this block.
s.ws.Lock()
for _, tx := range block.Transactions() {
if clist, ok := s.ws.minedTxNotifications[*tx.Sha()]; ok {
var enext *list.Element
for e := clist.Front(); e != nil; e = enext {
enext = e.Next()
c := e.Value.(walletChan)
// TODO: remove int32 type conversion after
// the int64 -> int32 switch is made.
ntfn := btcws.NewTxMinedNtfn(tx.Sha().String(),
hash.String(), int32(block.Height()),
block.MsgBlock().Header.Timestamp.Unix(),
tx.Index())
mntfn, _ := json.Marshal(ntfn)
c <- mntfn
s.ws.removeMinedTxRequest(c, tx.Sha())
}
}
}
s.ws.Unlock()
}
// NotifyBlockDisconnected creates and marshals a JSON message to notify
// of a new block disconnected from the main chain. The notification is sent
// to each connected wallet.
func (s *rpcServer) NotifyBlockDisconnected(block *btcutil.Block) {
hash, err := block.Sha()
if err != nil {
rpcsLog.Error("Bad block; connected block notification dropped.")
return
}
// TODO: remove int32 type conversion.
ntfn := btcws.NewBlockDisconnectedNtfn(hash.String(),
int32(block.Height()))
mntfn, _ := json.Marshal(ntfn)
s.ws.walletNotificationMaster <- mntfn
}
// NotifyBlockTXs creates and marshals a JSON message to notify wallets
// of new transactions (with both spent and unspent outputs) for a watched
// address.
func (s *rpcServer) NotifyBlockTXs(db btcdb.Db, block *btcutil.Block) {
for _, tx := range block.Transactions() {
s.newBlockNotifyCheckTxIn(tx)
s.NotifyForTxOuts(tx, block)
}
}
func notifySpentData(wallet walletChan, txhash *btcwire.ShaHash, index uint32,
spender *btcutil.Tx) {
var buf bytes.Buffer
// Ignore Serialize's error, as writing to a bytes.buffer
// cannot fail.
spender.MsgTx().Serialize(&buf)
txStr := hex.EncodeToString(buf.Bytes())
// TODO(jrick): create a new notification in btcws and use that.
ntfn := btcws.NewTxSpentNtfn(txhash.String(), int(index), txStr)
mntfn, _ := ntfn.MarshalJSON()
wallet <- mntfn
}
// newBlockNotifyCheckTxIn is a helper function to iterate through
// each transaction input of a new block and perform any checks and
// notify listening frontends when necessary.
func (s *rpcServer) newBlockNotifyCheckTxIn(tx *btcutil.Tx) {
for _, txin := range tx.MsgTx().TxIn {
if clist, ok := s.ws.spentNotifications[txin.PreviousOutpoint]; ok {
var enext *list.Element
for e := clist.Front(); e != nil; e = enext {
enext = e.Next()
c := e.Value.(walletChan)
notifySpentData(c, &txin.PreviousOutpoint.Hash,
txin.PreviousOutpoint.Index, tx)
s.ws.RemoveSpentRequest(c, &txin.PreviousOutpoint)
}
}
}
}
// NotifyForTxOuts iterates through all outputs of a tx, performing any
// necessary notifications for wallets. If a non-nil block is passed,
// additional block information is passed with the notifications.
func (s *rpcServer) NotifyForTxOuts(tx *btcutil.Tx, block *btcutil.Block) {
for i, txout := range tx.MsgTx().TxOut {
_, addrs, _, err := btcscript.ExtractPkScriptAddrs(
txout.PkScript, s.server.btcnet)
if err != nil {
continue
}
for _, addr := range addrs {
// Only support pay-to-pubkey-hash right now.
if _, ok := addr.(*btcutil.AddressPubKeyHash); !ok {
continue
}
encodedAddr := addr.EncodeAddress()
if idlist, ok := s.ws.txNotifications[encodedAddr]; ok {
for e := idlist.Front(); e != nil; e = e.Next() {
wallet := e.Value.(walletChan)
ntfn := &btcws.ProcessedTxNtfn{
Receiver: encodedAddr,
TxID: tx.Sha().String(),
TxOutIndex: uint32(i),
Amount: txout.Value,
PkScript: hex.EncodeToString(txout.PkScript),
// TODO(jrick): hardcoding unspent is WRONG and needs
// to be either calculated from other block txs, or dropped.
Spent: false,
}
if block != nil {
blkhash, err := block.Sha()
if err != nil {
rpcsLog.Error("Error getting block sha; dropping Tx notification.")
break
}
ntfn.BlockHeight = int32(block.Height())
ntfn.BlockHash = blkhash.String()
ntfn.BlockIndex = tx.Index()
ntfn.BlockTime = block.MsgBlock().Header.Timestamp.Unix()
} else {
ntfn.BlockHeight = -1
ntfn.BlockIndex = -1
}
mntfn, _ := ntfn.MarshalJSON()
wallet <- mntfn
}
}
}
}
}