neoneo-go/pkg/rpc/server/server.go
2020-07-09 13:26:39 +03:00

1264 lines
36 KiB
Go

package server
import (
"context"
"encoding/hex"
"encoding/json"
"fmt"
"math"
"math/big"
"net"
"net/http"
"strconv"
"sync"
"time"
"github.com/gorilla/websocket"
"github.com/nspcc-dev/neo-go/pkg/config/netmode"
"github.com/nspcc-dev/neo-go/pkg/core"
"github.com/nspcc-dev/neo-go/pkg/core/block"
"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
"github.com/nspcc-dev/neo-go/pkg/core/state"
"github.com/nspcc-dev/neo-go/pkg/core/transaction"
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
"github.com/nspcc-dev/neo-go/pkg/encoding/address"
"github.com/nspcc-dev/neo-go/pkg/encoding/bigint"
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/network"
"github.com/nspcc-dev/neo-go/pkg/rpc"
"github.com/nspcc-dev/neo-go/pkg/rpc/request"
"github.com/nspcc-dev/neo-go/pkg/rpc/response"
"github.com/nspcc-dev/neo-go/pkg/rpc/response/result"
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/pkg/errors"
"go.uber.org/zap"
)
type (
// Server represents the JSON-RPC 2.0 server.
Server struct {
*http.Server
chain blockchainer.Blockchainer
config rpc.Config
network netmode.Magic
coreServer *network.Server
log *zap.Logger
https *http.Server
shutdown chan struct{}
subsLock sync.RWMutex
subscribers map[*subscriber]bool
subsGroup sync.WaitGroup
blockSubs int
executionSubs int
notificationSubs int
transactionSubs int
blockCh chan *block.Block
executionCh chan *state.AppExecResult
notificationCh chan *state.NotificationEvent
transactionCh chan *transaction.Transaction
}
)
const (
// Message limit for receiving side.
wsReadLimit = 4096
// Disconnection timeout.
wsPongLimit = 60 * time.Second
// Ping period for connection liveness check.
wsPingPeriod = wsPongLimit / 2
// Write deadline.
wsWriteLimit = wsPingPeriod / 2
// Maximum number of subscribers per Server. Each websocket client is
// treated like subscriber, so technically it's a limit on websocket
// connections.
maxSubscribers = 64
)
var rpcHandlers = map[string]func(*Server, request.Params) (interface{}, *response.Error){
"getapplicationlog": (*Server).getApplicationLog,
"getbestblockhash": (*Server).getBestBlockHash,
"getblock": (*Server).getBlock,
"getblockcount": (*Server).getBlockCount,
"getblockhash": (*Server).getBlockHash,
"getblockheader": (*Server).getBlockHeader,
"getblocksysfee": (*Server).getBlockSysFee,
"getconnectioncount": (*Server).getConnectionCount,
"getcontractstate": (*Server).getContractState,
"getnep5balances": (*Server).getNEP5Balances,
"getnep5transfers": (*Server).getNEP5Transfers,
"getpeers": (*Server).getPeers,
"getrawmempool": (*Server).getRawMempool,
"getrawtransaction": (*Server).getrawtransaction,
"getstorage": (*Server).getStorage,
"gettransactionheight": (*Server).getTransactionHeight,
"getunclaimedgas": (*Server).getUnclaimedGas,
"getvalidators": (*Server).getValidators,
"getversion": (*Server).getVersion,
"invokefunction": (*Server).invokeFunction,
"invokescript": (*Server).invokescript,
"sendrawtransaction": (*Server).sendrawtransaction,
"submitblock": (*Server).submitBlock,
"validateaddress": (*Server).validateAddress,
}
var rpcWsHandlers = map[string]func(*Server, request.Params, *subscriber) (interface{}, *response.Error){
"subscribe": (*Server).subscribe,
"unsubscribe": (*Server).unsubscribe,
}
var invalidBlockHeightError = func(index int, height int) *response.Error {
return response.NewRPCError(fmt.Sprintf("Param at index %d should be greater than or equal to 0 and less then or equal to current block height, got: %d", index, height), "", nil)
}
// upgrader is a no-op websocket.Upgrader that reuses HTTP server buffers and
// doesn't set any Error function.
var upgrader = websocket.Upgrader{}
// New creates a new Server struct.
func New(chain blockchainer.Blockchainer, conf rpc.Config, coreServer *network.Server, log *zap.Logger) Server {
httpServer := &http.Server{
Addr: conf.Address + ":" + strconv.FormatUint(uint64(conf.Port), 10),
}
var tlsServer *http.Server
if cfg := conf.TLSConfig; cfg.Enabled {
tlsServer = &http.Server{
Addr: net.JoinHostPort(cfg.Address, strconv.FormatUint(uint64(cfg.Port), 10)),
}
}
return Server{
Server: httpServer,
chain: chain,
config: conf,
network: chain.GetConfig().Magic,
coreServer: coreServer,
log: log,
https: tlsServer,
shutdown: make(chan struct{}),
subscribers: make(map[*subscriber]bool),
// These are NOT buffered to preserve original order of events.
blockCh: make(chan *block.Block),
executionCh: make(chan *state.AppExecResult),
notificationCh: make(chan *state.NotificationEvent),
transactionCh: make(chan *transaction.Transaction),
}
}
// Start creates a new JSON-RPC server listening on the configured port. It's
// supposed to be run as a separate goroutine (like http.Server's Serve) and it
// returns its errors via given errChan.
func (s *Server) Start(errChan chan error) {
if !s.config.Enabled {
s.log.Info("RPC server is not enabled")
return
}
s.Handler = http.HandlerFunc(s.handleHTTPRequest)
s.log.Info("starting rpc-server", zap.String("endpoint", s.Addr))
go s.handleSubEvents()
if cfg := s.config.TLSConfig; cfg.Enabled {
s.https.Handler = http.HandlerFunc(s.handleHTTPRequest)
s.log.Info("starting rpc-server (https)", zap.String("endpoint", s.https.Addr))
go func() {
err := s.https.ListenAndServeTLS(cfg.CertFile, cfg.KeyFile)
if err != http.ErrServerClosed {
s.log.Error("failed to start TLS RPC server", zap.Error(err))
errChan <- err
}
}()
}
err := s.ListenAndServe()
if err != http.ErrServerClosed {
s.log.Error("failed to start RPC server", zap.Error(err))
errChan <- err
}
}
// Shutdown overrides the http.Server Shutdown
// method.
func (s *Server) Shutdown() error {
var httpsErr error
// Signal to websocket writer routines and handleSubEvents.
close(s.shutdown)
if s.config.TLSConfig.Enabled {
s.log.Info("shutting down rpc-server (https)", zap.String("endpoint", s.https.Addr))
httpsErr = s.https.Shutdown(context.Background())
}
s.log.Info("shutting down rpc-server", zap.String("endpoint", s.Addr))
err := s.Server.Shutdown(context.Background())
// Wait for handleSubEvents to finish.
<-s.executionCh
if err == nil {
return httpsErr
}
return err
}
func (s *Server) handleHTTPRequest(w http.ResponseWriter, httpRequest *http.Request) {
req := request.NewIn()
if httpRequest.URL.Path == "/ws" && httpRequest.Method == "GET" {
// Technically there is a race between this check and
// s.subscribers modification 20 lines below, but it's tiny
// and not really critical to bother with it. Some additional
// clients may sneak in, no big deal.
s.subsLock.RLock()
numOfSubs := len(s.subscribers)
s.subsLock.RUnlock()
if numOfSubs >= maxSubscribers {
s.writeHTTPErrorResponse(
req,
w,
response.NewInternalServerError("websocket users limit reached", nil),
)
return
}
ws, err := upgrader.Upgrade(w, httpRequest, nil)
if err != nil {
s.log.Info("websocket connection upgrade failed", zap.Error(err))
return
}
resChan := make(chan response.Raw)
subChan := make(chan *websocket.PreparedMessage, notificationBufSize)
subscr := &subscriber{writer: subChan, ws: ws}
s.subsLock.Lock()
s.subscribers[subscr] = true
s.subsLock.Unlock()
go s.handleWsWrites(ws, resChan, subChan)
s.handleWsReads(ws, resChan, subscr)
return
}
if httpRequest.Method != "POST" {
s.writeHTTPErrorResponse(
req,
w,
response.NewInvalidParamsError(
fmt.Sprintf("Invalid method '%s', please retry with 'POST'", httpRequest.Method), nil,
),
)
return
}
err := req.DecodeData(httpRequest.Body)
if err != nil {
s.writeHTTPErrorResponse(req, w, response.NewParseError("Problem parsing JSON-RPC request body", err))
return
}
resp := s.handleRequest(req, nil)
s.writeHTTPServerResponse(req, w, resp)
}
func (s *Server) handleRequest(req *request.In, sub *subscriber) response.Raw {
var res interface{}
var resErr *response.Error
reqParams, err := req.Params()
if err != nil {
return s.packResponseToRaw(req, nil, response.NewInvalidParamsError("Problem parsing request parameters", err))
}
s.log.Debug("processing rpc request",
zap.String("method", req.Method),
zap.String("params", fmt.Sprintf("%v", reqParams)))
incCounter(req.Method)
resErr = response.NewMethodNotFoundError(fmt.Sprintf("Method '%s' not supported", req.Method), nil)
handler, ok := rpcHandlers[req.Method]
if ok {
res, resErr = handler(s, *reqParams)
} else if sub != nil {
handler, ok := rpcWsHandlers[req.Method]
if ok {
res, resErr = handler(s, *reqParams, sub)
}
}
return s.packResponseToRaw(req, res, resErr)
}
func (s *Server) handleWsWrites(ws *websocket.Conn, resChan <-chan response.Raw, subChan <-chan *websocket.PreparedMessage) {
pingTicker := time.NewTicker(wsPingPeriod)
eventloop:
for {
select {
case <-s.shutdown:
break eventloop
case event, ok := <-subChan:
if !ok {
break eventloop
}
ws.SetWriteDeadline(time.Now().Add(wsWriteLimit))
if err := ws.WritePreparedMessage(event); err != nil {
break eventloop
}
case res, ok := <-resChan:
if !ok {
break eventloop
}
ws.SetWriteDeadline(time.Now().Add(wsWriteLimit))
if err := ws.WriteJSON(res); err != nil {
break eventloop
}
case <-pingTicker.C:
ws.SetWriteDeadline(time.Now().Add(wsWriteLimit))
if err := ws.WriteMessage(websocket.PingMessage, []byte{}); err != nil {
break eventloop
}
}
}
ws.Close()
pingTicker.Stop()
// Drain notification channel as there might be some goroutines blocked
// on it.
drainloop:
for {
select {
case _, ok := <-subChan:
if !ok {
break drainloop
}
default:
break drainloop
}
}
}
func (s *Server) handleWsReads(ws *websocket.Conn, resChan chan<- response.Raw, subscr *subscriber) {
ws.SetReadLimit(wsReadLimit)
ws.SetReadDeadline(time.Now().Add(wsPongLimit))
ws.SetPongHandler(func(string) error { ws.SetReadDeadline(time.Now().Add(wsPongLimit)); return nil })
requestloop:
for {
req := new(request.In)
err := ws.ReadJSON(req)
if err != nil {
break
}
res := s.handleRequest(req, subscr)
if res.Error != nil {
s.logRequestError(req, res.Error)
}
select {
case <-s.shutdown:
break requestloop
case resChan <- res:
}
}
s.subsLock.Lock()
delete(s.subscribers, subscr)
for _, e := range subscr.feeds {
if e.event != response.InvalidEventID {
s.unsubscribeFromChannel(e.event)
}
}
s.subsLock.Unlock()
close(resChan)
ws.Close()
}
func (s *Server) getBestBlockHash(_ request.Params) (interface{}, *response.Error) {
return "0x" + s.chain.CurrentBlockHash().StringLE(), nil
}
func (s *Server) getBlockCount(_ request.Params) (interface{}, *response.Error) {
return s.chain.BlockHeight() + 1, nil
}
func (s *Server) getConnectionCount(_ request.Params) (interface{}, *response.Error) {
return s.coreServer.PeerCount(), nil
}
func (s *Server) blockHashFromParam(param *request.Param) (util.Uint256, *response.Error) {
var hash util.Uint256
if param == nil {
return hash, response.ErrInvalidParams
}
switch param.Type {
case request.StringT:
var err error
hash, err = param.GetUint256()
if err != nil {
return hash, response.ErrInvalidParams
}
case request.NumberT:
num, err := s.blockHeightFromParam(param)
if err != nil {
return hash, response.ErrInvalidParams
}
hash = s.chain.GetHeaderHash(num)
default:
return hash, response.ErrInvalidParams
}
return hash, nil
}
func (s *Server) getBlock(reqParams request.Params) (interface{}, *response.Error) {
param := reqParams.Value(0)
hash, respErr := s.blockHashFromParam(param)
if respErr != nil {
return nil, respErr
}
block, err := s.chain.GetBlock(hash)
if err != nil {
return nil, response.NewInternalServerError(fmt.Sprintf("Problem locating block with hash: %s", hash), err)
}
if reqParams.Value(1).GetBoolean() {
return result.NewBlock(block, s.chain), nil
}
writer := io.NewBufBinWriter()
block.EncodeBinary(writer.BinWriter)
return hex.EncodeToString(writer.Bytes()), nil
}
func (s *Server) getBlockHash(reqParams request.Params) (interface{}, *response.Error) {
param := reqParams.ValueWithType(0, request.NumberT)
if param == nil {
return nil, response.ErrInvalidParams
}
num, err := s.blockHeightFromParam(param)
if err != nil {
return nil, response.ErrInvalidParams
}
return s.chain.GetHeaderHash(num), nil
}
func (s *Server) getVersion(_ request.Params) (interface{}, *response.Error) {
port, err := s.coreServer.Port()
if err != nil {
return nil, response.NewInternalServerError("Cannot fetch tcp port", err)
}
return result.Version{
TCPPort: port,
Nonce: s.coreServer.ID(),
UserAgent: s.coreServer.UserAgent,
}, nil
}
func (s *Server) getPeers(_ request.Params) (interface{}, *response.Error) {
peers := result.NewGetPeers()
peers.AddUnconnected(s.coreServer.UnconnectedPeers())
peers.AddConnected(s.coreServer.ConnectedPeers())
peers.AddBad(s.coreServer.BadPeers())
return peers, nil
}
func (s *Server) getRawMempool(_ request.Params) (interface{}, *response.Error) {
mp := s.chain.GetMemPool()
hashList := make([]util.Uint256, 0)
for _, item := range mp.GetVerifiedTransactions() {
hashList = append(hashList, item.Hash())
}
return hashList, nil
}
func (s *Server) validateAddress(reqParams request.Params) (interface{}, *response.Error) {
param := reqParams.Value(0)
if param == nil {
return nil, response.ErrInvalidParams
}
return validateAddress(param.Value), nil
}
// getApplicationLog returns the contract log based on the specified txid.
func (s *Server) getApplicationLog(reqParams request.Params) (interface{}, *response.Error) {
txHash, err := reqParams.Value(0).GetUint256()
if err != nil {
return nil, response.ErrInvalidParams
}
appExecResult, err := s.chain.GetAppExecResult(txHash)
if err != nil {
return nil, response.NewRPCError("Unknown transaction", "", err)
}
return result.NewApplicationLog(appExecResult), nil
}
func (s *Server) getNEP5Balances(ps request.Params) (interface{}, *response.Error) {
u, err := ps.ValueWithType(0, request.StringT).GetUint160FromHex()
if err != nil {
return nil, response.ErrInvalidParams
}
as := s.chain.GetNEP5Balances(u)
bs := &result.NEP5Balances{
Address: address.Uint160ToString(u),
Balances: []result.NEP5Balance{},
}
if as != nil {
cache := make(map[util.Uint160]int64)
for h, bal := range as.Trackers {
dec, err := s.getDecimals(h, cache)
if err != nil {
continue
}
amount := amountToString(&bal.Balance, dec)
bs.Balances = append(bs.Balances, result.NEP5Balance{
Asset: h,
Amount: amount,
LastUpdated: bal.LastUpdatedBlock,
})
}
}
return bs, nil
}
func (s *Server) getNEP5Transfers(ps request.Params) (interface{}, *response.Error) {
u, err := ps.ValueWithType(0, request.StringT).GetUint160FromAddress()
if err != nil {
return nil, response.ErrInvalidParams
}
bs := &result.NEP5Transfers{
Address: address.Uint160ToString(u),
Received: []result.NEP5Transfer{},
Sent: []result.NEP5Transfer{},
}
lg := s.chain.GetNEP5TransferLog(u)
cache := make(map[util.Uint160]int64)
err = lg.ForEach(func(tr *state.NEP5Transfer) error {
transfer := result.NEP5Transfer{
Timestamp: tr.Timestamp,
Asset: tr.Asset,
Index: tr.Block,
TxHash: tr.Tx,
}
d, err := s.getDecimals(tr.Asset, cache)
if err != nil {
return nil
}
if tr.Amount.Sign() > 0 { // token was received
transfer.Amount = amountToString(&tr.Amount, d)
if !tr.From.Equals(util.Uint160{}) {
transfer.Address = address.Uint160ToString(tr.From)
}
bs.Received = append(bs.Received, transfer)
return nil
}
transfer.Amount = amountToString(new(big.Int).Neg(&tr.Amount), d)
if !tr.To.Equals(util.Uint160{}) {
transfer.Address = address.Uint160ToString(tr.To)
}
bs.Sent = append(bs.Sent, transfer)
return nil
})
if err != nil {
return nil, response.NewInternalServerError("invalid NEP5 transfer log", err)
}
return bs, nil
}
func amountToString(amount *big.Int, decimals int64) string {
if decimals == 0 {
return amount.String()
}
pow := int64(math.Pow10(int(decimals)))
q, r := new(big.Int).DivMod(amount, big.NewInt(pow), new(big.Int))
if r.Sign() == 0 {
return q.String()
}
fs := fmt.Sprintf("%%d.%%0%dd", decimals)
return fmt.Sprintf(fs, q, r)
}
func (s *Server) getDecimals(h util.Uint160, cache map[util.Uint160]int64) (int64, *response.Error) {
if d, ok := cache[h]; ok {
return d, nil
}
script, err := request.CreateFunctionInvocationScript(h, request.Params{
{
Type: request.StringT,
Value: "decimals",
},
{
Type: request.ArrayT,
Value: []request.Param{},
},
})
if err != nil {
return 0, response.NewInternalServerError("Can't create script", err)
}
res := s.runScriptInVM(script, nil)
if res == nil || res.State != "HALT" || len(res.Stack) == 0 {
return 0, response.NewInternalServerError("execution error", errors.New("no result"))
}
var d int64
switch item := res.Stack[len(res.Stack)-1]; item.Type {
case smartcontract.IntegerType:
d = item.Value.(int64)
case smartcontract.ByteArrayType:
d = bigint.FromBytes(item.Value.([]byte)).Int64()
default:
return 0, response.NewInternalServerError("invalid result", errors.New("not an integer"))
}
if d < 0 {
return 0, response.NewInternalServerError("incorrect result", errors.New("negative result"))
}
cache[h] = d
return d, nil
}
func (s *Server) contractIDFromParam(param *request.Param) (int32, *response.Error) {
var result int32
if param == nil {
return 0, response.ErrInvalidParams
}
switch param.Type {
case request.StringT:
var err error
scriptHash, err := param.GetUint160FromHex()
if err != nil {
return 0, response.ErrInvalidParams
}
cs := s.chain.GetContractState(scriptHash)
if cs == nil {
return 0, response.ErrUnknown
}
result = cs.ID
case request.NumberT:
id, err := param.GetInt()
if err != nil {
return 0, response.ErrInvalidParams
}
result = int32(id)
default:
return 0, response.ErrInvalidParams
}
return result, nil
}
func (s *Server) getStorage(ps request.Params) (interface{}, *response.Error) {
id, rErr := s.contractIDFromParam(ps.Value(0))
if rErr == response.ErrUnknown {
return nil, nil
}
if rErr != nil {
return nil, rErr
}
key, err := ps.Value(1).GetBytesHex()
if err != nil {
return nil, response.ErrInvalidParams
}
item := s.chain.GetStorageItem(id, key)
if item == nil {
return nil, nil
}
return hex.EncodeToString(item.Value), nil
}
func (s *Server) getrawtransaction(reqParams request.Params) (interface{}, *response.Error) {
var resultsErr *response.Error
var results interface{}
if txHash, err := reqParams.Value(0).GetUint256(); err != nil {
resultsErr = response.ErrInvalidParams
} else if tx, height, err := s.chain.GetTransaction(txHash); err != nil {
err = errors.Wrapf(err, "Invalid transaction hash: %s", txHash)
return nil, response.NewRPCError("Unknown transaction", err.Error(), err)
} else if reqParams.Value(1).GetBoolean() {
_header := s.chain.GetHeaderHash(int(height))
header, err := s.chain.GetHeader(_header)
if err != nil {
resultsErr = response.NewInvalidParamsError(err.Error(), err)
} else {
results = result.NewTransactionOutputRaw(tx, header, s.chain)
}
} else {
results = hex.EncodeToString(tx.Bytes())
}
return results, resultsErr
}
func (s *Server) getTransactionHeight(ps request.Params) (interface{}, *response.Error) {
h, err := ps.Value(0).GetUint256()
if err != nil {
return nil, response.ErrInvalidParams
}
_, height, err := s.chain.GetTransaction(h)
if err != nil {
return nil, response.NewRPCError("unknown transaction", "", nil)
}
return height, nil
}
// getContractState returns contract state (contract information, according to the contract script hash).
func (s *Server) getContractState(reqParams request.Params) (interface{}, *response.Error) {
scriptHash, err := reqParams.ValueWithType(0, request.StringT).GetUint160FromHex()
if err != nil {
return nil, response.ErrInvalidParams
}
cs := s.chain.GetContractState(scriptHash)
if cs == nil {
return nil, response.NewRPCError("Unknown contract", "", nil)
}
return cs, nil
}
// getBlockSysFee returns the system fees of the block, based on the specified index.
func (s *Server) getBlockSysFee(reqParams request.Params) (interface{}, *response.Error) {
param := reqParams.ValueWithType(0, request.NumberT)
if param == nil {
return 0, response.ErrInvalidParams
}
num, err := s.blockHeightFromParam(param)
if err != nil {
return 0, response.NewRPCError("Invalid height", "", nil)
}
headerHash := s.chain.GetHeaderHash(num)
block, errBlock := s.chain.GetBlock(headerHash)
if errBlock != nil {
return 0, response.NewRPCError(errBlock.Error(), "", nil)
}
var blockSysFee int64
for _, tx := range block.Transactions {
blockSysFee += tx.SystemFee
}
return blockSysFee, nil
}
// getBlockHeader returns the corresponding block header information according to the specified script hash.
func (s *Server) getBlockHeader(reqParams request.Params) (interface{}, *response.Error) {
param := reqParams.Value(0)
hash, respErr := s.blockHashFromParam(param)
if respErr != nil {
return nil, respErr
}
verbose := reqParams.Value(1).GetBoolean()
h, err := s.chain.GetHeader(hash)
if err != nil {
return nil, response.NewRPCError("unknown block", "", nil)
}
if verbose {
return result.NewHeader(h, s.chain), nil
}
buf := io.NewBufBinWriter()
h.EncodeBinary(buf.BinWriter)
if buf.Err != nil {
return nil, response.NewInternalServerError("encoding error", buf.Err)
}
return hex.EncodeToString(buf.Bytes()), nil
}
// getUnclaimedGas returns unclaimed GAS amount of the specified address.
func (s *Server) getUnclaimedGas(ps request.Params) (interface{}, *response.Error) {
u, err := ps.ValueWithType(0, request.StringT).GetUint160FromAddress()
if err != nil {
return nil, response.ErrInvalidParams
}
neo, neoHeight := s.chain.GetGoverningTokenBalance(u)
if neo.Sign() == 0 {
return "0", nil
}
gas := s.chain.CalculateClaimable(neo, neoHeight, s.chain.BlockHeight()+1) // +1 as in C#, for the next block.
return gas.String(), nil
}
// getValidators returns the current NEO consensus nodes information and voting status.
func (s *Server) getValidators(_ request.Params) (interface{}, *response.Error) {
var validators keys.PublicKeys
validators, err := s.chain.GetValidators()
if err != nil {
return nil, response.NewRPCError("can't get validators", "", err)
}
enrollments, err := s.chain.GetEnrollments()
if err != nil {
return nil, response.NewRPCError("can't get enrollments", "", err)
}
var res []result.Validator
for _, v := range enrollments {
res = append(res, result.Validator{
PublicKey: *v.Key,
Votes: v.Votes.Int64(),
Active: validators.Contains(v.Key),
})
}
return res, nil
}
// invokeFunction implements the `invokeFunction` RPC call.
func (s *Server) invokeFunction(reqParams request.Params) (interface{}, *response.Error) {
scriptHash, err := reqParams.ValueWithType(0, request.StringT).GetUint160FromHex()
if err != nil {
return nil, response.ErrInvalidParams
}
tx := &transaction.Transaction{}
checkWitnessHashesIndex := len(reqParams)
if checkWitnessHashesIndex > 3 {
cosigners, err := reqParams[3].GetCosigners()
if err != nil {
return nil, response.ErrInvalidParams
}
tx.Cosigners = cosigners
checkWitnessHashesIndex--
}
script, err := request.CreateFunctionInvocationScript(scriptHash, reqParams[1:checkWitnessHashesIndex])
if err != nil {
return nil, response.NewInternalServerError("can't create invocation script", err)
}
return s.runScriptInVM(script, tx), nil
}
// invokescript implements the `invokescript` RPC call.
func (s *Server) invokescript(reqParams request.Params) (interface{}, *response.Error) {
if len(reqParams) < 1 {
return nil, response.ErrInvalidParams
}
script, err := reqParams[0].GetBytesHex()
if err != nil {
return nil, response.ErrInvalidParams
}
tx := &transaction.Transaction{}
if len(reqParams) > 1 {
cosigners, err := reqParams[1].GetCosigners()
if err != nil {
return nil, response.ErrInvalidParams
}
tx.Cosigners = cosigners
}
return s.runScriptInVM(script, tx), nil
}
// runScriptInVM runs given script in a new test VM and returns the invocation
// result.
func (s *Server) runScriptInVM(script []byte, tx *transaction.Transaction) *result.Invoke {
vm := s.chain.GetTestVM(tx)
vm.GasLimit = int64(s.config.MaxGasInvoke)
vm.LoadScriptWithFlags(script, smartcontract.All)
_ = vm.Run()
result := &result.Invoke{
State: vm.State(),
GasConsumed: vm.GasConsumed(),
Script: hex.EncodeToString(script),
Stack: vm.Estack().ToContractParameters(),
}
return result
}
// submitBlock broadcasts a raw block over the NEO network.
func (s *Server) submitBlock(reqParams request.Params) (interface{}, *response.Error) {
blockBytes, err := reqParams.ValueWithType(0, request.StringT).GetBytesHex()
if err != nil {
return nil, response.ErrInvalidParams
}
b := block.New(s.network)
r := io.NewBinReaderFromBuf(blockBytes)
b.DecodeBinary(r)
if r.Err != nil {
return nil, response.ErrInvalidParams
}
err = s.chain.AddBlock(b)
if err != nil {
switch err {
case core.ErrInvalidBlockIndex, core.ErrAlreadyExists:
return nil, response.ErrAlreadyExists
default:
return nil, response.ErrValidationFailed
}
}
return true, nil
}
func (s *Server) sendrawtransaction(reqParams request.Params) (interface{}, *response.Error) {
var resultsErr *response.Error
var results interface{}
if len(reqParams) < 1 {
return nil, response.ErrInvalidParams
} else if byteTx, err := reqParams[0].GetBytesHex(); err != nil {
return nil, response.ErrInvalidParams
} else {
tx, err := transaction.NewTransactionFromBytes(s.network, byteTx)
if err != nil {
return nil, response.ErrInvalidParams
}
relayReason := s.coreServer.RelayTxn(tx)
switch relayReason {
case network.RelaySucceed:
results = true
case network.RelayAlreadyExists:
resultsErr = response.ErrAlreadyExists
case network.RelayOutOfMemory:
resultsErr = response.ErrOutOfMemory
case network.RelayUnableToVerify:
resultsErr = response.ErrUnableToVerify
case network.RelayInvalid:
resultsErr = response.ErrValidationFailed
case network.RelayPolicyFail:
resultsErr = response.ErrPolicyFail
default:
resultsErr = response.ErrUnknown
}
}
return results, resultsErr
}
// subscribe handles subscription requests from websocket clients.
func (s *Server) subscribe(reqParams request.Params, sub *subscriber) (interface{}, *response.Error) {
streamName, err := reqParams.Value(0).GetString()
if err != nil {
return nil, response.ErrInvalidParams
}
event, err := response.GetEventIDFromString(streamName)
if err != nil || event == response.MissedEventID {
return nil, response.ErrInvalidParams
}
// Optional filter.
var filter interface{}
if p := reqParams.Value(1); p != nil {
switch event {
case response.BlockEventID:
if p.Type != request.BlockFilterT {
return nil, response.ErrInvalidParams
}
case response.TransactionEventID:
if p.Type != request.TxFilterT {
return nil, response.ErrInvalidParams
}
case response.NotificationEventID:
if p.Type != request.NotificationFilterT {
return nil, response.ErrInvalidParams
}
case response.ExecutionEventID:
if p.Type != request.ExecutionFilterT {
return nil, response.ErrInvalidParams
}
}
filter = p.Value
}
s.subsLock.Lock()
defer s.subsLock.Unlock()
select {
case <-s.shutdown:
return nil, response.NewInternalServerError("server is shutting down", nil)
default:
}
var id int
for ; id < len(sub.feeds); id++ {
if sub.feeds[id].event == response.InvalidEventID {
break
}
}
if id == len(sub.feeds) {
return nil, response.NewInternalServerError("maximum number of subscriptions is reached", nil)
}
sub.feeds[id].event = event
sub.feeds[id].filter = filter
s.subscribeToChannel(event)
return strconv.FormatInt(int64(id), 10), nil
}
// subscribeToChannel subscribes RPC server to appropriate chain events if
// it's not yet subscribed for them. It's supposed to be called with s.subsLock
// taken by the caller.
func (s *Server) subscribeToChannel(event response.EventID) {
switch event {
case response.BlockEventID:
if s.blockSubs == 0 {
s.chain.SubscribeForBlocks(s.blockCh)
}
s.blockSubs++
case response.TransactionEventID:
if s.transactionSubs == 0 {
s.chain.SubscribeForTransactions(s.transactionCh)
}
s.transactionSubs++
case response.NotificationEventID:
if s.notificationSubs == 0 {
s.chain.SubscribeForNotifications(s.notificationCh)
}
s.notificationSubs++
case response.ExecutionEventID:
if s.executionSubs == 0 {
s.chain.SubscribeForExecutions(s.executionCh)
}
s.executionSubs++
}
}
// unsubscribe handles unsubscription requests from websocket clients.
func (s *Server) unsubscribe(reqParams request.Params, sub *subscriber) (interface{}, *response.Error) {
id, err := reqParams.Value(0).GetInt()
if err != nil || id < 0 {
return nil, response.ErrInvalidParams
}
s.subsLock.Lock()
defer s.subsLock.Unlock()
if len(sub.feeds) <= id || sub.feeds[id].event == response.InvalidEventID {
return nil, response.ErrInvalidParams
}
event := sub.feeds[id].event
sub.feeds[id].event = response.InvalidEventID
sub.feeds[id].filter = nil
s.unsubscribeFromChannel(event)
return true, nil
}
// unsubscribeFromChannel unsubscribes RPC server from appropriate chain events
// if there are no other subscribers for it. It's supposed to be called with
// s.subsLock taken by the caller.
func (s *Server) unsubscribeFromChannel(event response.EventID) {
switch event {
case response.BlockEventID:
s.blockSubs--
if s.blockSubs == 0 {
s.chain.UnsubscribeFromBlocks(s.blockCh)
}
case response.TransactionEventID:
s.transactionSubs--
if s.transactionSubs == 0 {
s.chain.UnsubscribeFromTransactions(s.transactionCh)
}
case response.NotificationEventID:
s.notificationSubs--
if s.notificationSubs == 0 {
s.chain.UnsubscribeFromNotifications(s.notificationCh)
}
case response.ExecutionEventID:
s.executionSubs--
if s.executionSubs == 0 {
s.chain.UnsubscribeFromExecutions(s.executionCh)
}
}
}
func (s *Server) handleSubEvents() {
b, err := json.Marshal(response.Notification{
JSONRPC: request.JSONRPCVersion,
Event: response.MissedEventID,
Payload: make([]interface{}, 0),
})
if err != nil {
s.log.Error("fatal: failed to marshal overflow event", zap.Error(err))
return
}
overflowMsg, err := websocket.NewPreparedMessage(websocket.TextMessage, b)
if err != nil {
s.log.Error("fatal: failed to prepare overflow message", zap.Error(err))
return
}
chloop:
for {
var resp = response.Notification{
JSONRPC: request.JSONRPCVersion,
Payload: make([]interface{}, 1),
}
var msg *websocket.PreparedMessage
select {
case <-s.shutdown:
break chloop
case b := <-s.blockCh:
resp.Event = response.BlockEventID
resp.Payload[0] = b
case execution := <-s.executionCh:
resp.Event = response.ExecutionEventID
resp.Payload[0] = result.NewApplicationLog(execution)
case notification := <-s.notificationCh:
resp.Event = response.NotificationEventID
resp.Payload[0] = result.StateEventToResultNotification(*notification)
case tx := <-s.transactionCh:
resp.Event = response.TransactionEventID
resp.Payload[0] = tx
}
s.subsLock.RLock()
subloop:
for sub := range s.subscribers {
if sub.overflown.Load() {
continue
}
for i := range sub.feeds {
if sub.feeds[i].Matches(&resp) {
if msg == nil {
b, err = json.Marshal(resp)
if err != nil {
s.log.Error("failed to marshal notification",
zap.Error(err),
zap.String("type", resp.Event.String()))
break subloop
}
msg, err = websocket.NewPreparedMessage(websocket.TextMessage, b)
if err != nil {
s.log.Error("failed to prepare notification message",
zap.Error(err),
zap.String("type", resp.Event.String()))
break subloop
}
}
select {
case sub.writer <- msg:
default:
sub.overflown.Store(true)
// MissedEvent is to be delivered eventually.
go func(sub *subscriber) {
sub.writer <- overflowMsg
sub.overflown.Store(false)
}(sub)
}
// The message is sent only once per subscriber.
break
}
}
}
s.subsLock.RUnlock()
}
// It's important to do it with lock held because no subscription routine
// should be running concurrently to this one. And even if one is to run
// after unlock, it'll see closed s.shutdown and won't subscribe.
s.subsLock.Lock()
// There might be no subscription in reality, but it's not a problem as
// core.Blockchain allows unsubscribing non-subscribed channels.
s.chain.UnsubscribeFromBlocks(s.blockCh)
s.chain.UnsubscribeFromTransactions(s.transactionCh)
s.chain.UnsubscribeFromNotifications(s.notificationCh)
s.chain.UnsubscribeFromExecutions(s.executionCh)
s.subsLock.Unlock()
drainloop:
for {
select {
case <-s.blockCh:
case <-s.executionCh:
case <-s.notificationCh:
case <-s.transactionCh:
default:
break drainloop
}
}
// It's not required closing these, but since they're drained already
// this is safe and it also allows to give a signal to Shutdown routine.
close(s.blockCh)
close(s.transactionCh)
close(s.notificationCh)
close(s.executionCh)
}
func (s *Server) blockHeightFromParam(param *request.Param) (int, *response.Error) {
num, err := param.GetInt()
if err != nil {
return 0, nil
}
if num < 0 || num > int(s.chain.BlockHeight()) {
return 0, invalidBlockHeightError(0, num)
}
return num, nil
}
func (s *Server) packResponseToRaw(r *request.In, result interface{}, respErr *response.Error) response.Raw {
resp := response.Raw{
HeaderAndError: response.HeaderAndError{
Header: response.Header{
JSONRPC: r.JSONRPC,
ID: r.RawID,
},
},
}
if respErr != nil {
resp.Error = respErr
} else {
resJSON, err := json.Marshal(result)
if err != nil {
s.log.Error("failed to marshal result",
zap.Error(err),
zap.String("method", r.Method))
resp.Error = response.NewInternalServerError("failed to encode result", err)
} else {
resp.Result = resJSON
}
}
return resp
}
// logRequestError is a request error logger.
func (s *Server) logRequestError(r *request.In, jsonErr *response.Error) {
logFields := []zap.Field{
zap.Error(jsonErr.Cause),
zap.String("method", r.Method),
}
params, err := r.Params()
if err == nil {
logFields = append(logFields, zap.Any("params", params))
}
s.log.Error("Error encountered with rpc request", logFields...)
}
// writeHTTPErrorResponse writes an error response to the ResponseWriter.
func (s *Server) writeHTTPErrorResponse(r *request.In, w http.ResponseWriter, jsonErr *response.Error) {
resp := s.packResponseToRaw(r, nil, jsonErr)
s.writeHTTPServerResponse(r, w, resp)
}
func (s *Server) writeHTTPServerResponse(r *request.In, w http.ResponseWriter, resp response.Raw) {
// Errors can happen in many places and we can only catch ALL of them here.
if resp.Error != nil {
s.logRequestError(r, resp.Error)
w.WriteHeader(resp.Error.HTTPCode)
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
if s.config.EnableCORSWorkaround {
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With")
}
encoder := json.NewEncoder(w)
err := encoder.Encode(resp)
if err != nil {
s.log.Error("Error encountered while encoding response",
zap.String("err", err.Error()),
zap.String("method", r.Method))
}
}
// validateAddress verifies that the address is a correct NEO address
// see https://docs.neo.org/en-us/node/cli/2.9.4/api/validateaddress.html
func validateAddress(addr interface{}) result.ValidateAddress {
resp := result.ValidateAddress{Address: addr}
if addr, ok := addr.(string); ok {
_, err := address.StringToUint160(addr)
resp.IsValid = (err == nil)
}
return resp
}