neo-go/pkg/rpc/server/server.go
Roman Khimov a6fc5d9fe4
Merge pull request #1998 from nspcc-dev/fix-calculatenetworkfee-result
rpc: wrap calculatenetworkfee result in a structure
2021-06-07 09:53:48 +03:00

1806 lines
55 KiB
Go

package server
import (
"context"
"crypto/elliptic"
"encoding/binary"
"encoding/json"
"errors"
"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/fee"
"github.com/nspcc-dev/neo-go/pkg/core/mempoolevent"
"github.com/nspcc-dev/neo-go/pkg/core/mpt"
"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/hash"
"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/io"
"github.com/nspcc-dev/neo-go/pkg/network"
"github.com/nspcc-dev/neo-go/pkg/network/payload"
"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/services/oracle"
"github.com/nspcc-dev/neo-go/pkg/services/oracle/broadcaster"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/callflag"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
"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
stateRootEnabled bool
coreServer *network.Server
oracle *oracle.Oracle
log *zap.Logger
https *http.Server
shutdown chan struct{}
subsLock sync.RWMutex
subscribers map[*subscriber]bool
blockSubs int
executionSubs int
notificationSubs int
transactionSubs int
notaryRequestSubs int
blockCh chan *block.Block
executionCh chan *state.AppExecResult
notificationCh chan *state.NotificationEvent
transactionCh chan *transaction.Transaction
notaryRequestCh chan mempoolevent.Event
}
)
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
// Maximum number of elements for get*transfers requests.
maxTransfersLimit = 1000
)
var rpcHandlers = map[string]func(*Server, request.Params) (interface{}, *response.Error){
"calculatenetworkfee": (*Server).calculateNetworkFee,
"getapplicationlog": (*Server).getApplicationLog,
"getbestblockhash": (*Server).getBestBlockHash,
"getblock": (*Server).getBlock,
"getblockcount": (*Server).getBlockCount,
"getblockhash": (*Server).getBlockHash,
"getblockheader": (*Server).getBlockHeader,
"getblockheadercount": (*Server).getBlockHeaderCount,
"getblocksysfee": (*Server).getBlockSysFee,
"getcommittee": (*Server).getCommittee,
"getconnectioncount": (*Server).getConnectionCount,
"getcontractstate": (*Server).getContractState,
"getnativecontracts": (*Server).getNativeContracts,
"getnep17balances": (*Server).getNEP17Balances,
"getnep17transfers": (*Server).getNEP17Transfers,
"getpeers": (*Server).getPeers,
"getproof": (*Server).getProof,
"getrawmempool": (*Server).getRawMempool,
"getrawtransaction": (*Server).getrawtransaction,
"getstateheight": (*Server).getStateHeight,
"getstateroot": (*Server).getStateRoot,
"getstorage": (*Server).getStorage,
"gettransactionheight": (*Server).getTransactionHeight,
"getunclaimedgas": (*Server).getUnclaimedGas,
"getnextblockvalidators": (*Server).getNextBlockValidators,
"getversion": (*Server).getVersion,
"invokefunction": (*Server).invokeFunction,
"invokescript": (*Server).invokescript,
"invokecontractverify": (*Server).invokeContractVerify,
"sendrawtransaction": (*Server).sendrawtransaction,
"submitblock": (*Server).submitBlock,
"submitnotaryrequest": (*Server).submitNotaryRequest,
"submitoracleresponse": (*Server).submitOracleResponse,
"validateaddress": (*Server).validateAddress,
"verifyproof": (*Server).verifyProof,
}
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,
orc *oracle.Oracle, 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)),
}
}
if orc != nil {
orc.SetBroadcaster(broadcaster.New(orc.MainCfg, log))
}
return Server{
Server: httpServer,
chain: chain,
config: conf,
network: chain.GetConfig().Magic,
stateRootEnabled: chain.GetConfig().StateRootInHeader,
coreServer: coreServer,
log: log,
oracle: orc,
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),
notaryRequestCh: make(chan mempoolevent.Event),
}
}
// 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() {
ln, err := net.Listen("tcp", s.https.Addr)
if err != nil {
errChan <- err
return
}
s.https.Addr = ln.Addr().String()
err = s.https.ServeTLS(ln, cfg.CertFile, cfg.KeyFile)
if err != http.ErrServerClosed {
s.log.Error("failed to start TLS RPC server", zap.Error(err))
errChan <- err
}
}()
}
ln, err := net.Listen("tcp", s.Addr)
if err != nil {
errChan <- err
return
}
s.Addr = ln.Addr().String() // set Addr to the actual address
go func() {
err = s.Serve(ln)
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.NewRequest()
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(
request.NewIn(),
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.AbstractResult) // response.Abstract or response.AbstractBatch
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(
request.NewIn(),
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(request.NewIn(), 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.Request, sub *subscriber) response.AbstractResult {
if req.In != nil {
return s.handleIn(req.In, sub)
}
resp := make(response.AbstractBatch, len(req.Batch))
for i, in := range req.Batch {
resp[i] = s.handleIn(&in, sub)
}
return resp
}
func (s *Server) handleIn(req *request.In, sub *subscriber) response.Abstract {
var res interface{}
var resErr *response.Error
if req.JSONRPC != request.JSONRPCVersion {
return s.packResponse(req, nil, response.NewInvalidParamsError("Problem parsing JSON", fmt.Errorf("invalid version, expected 2.0 got: '%s'", req.JSONRPC)))
}
reqParams, err := req.Params()
if err != nil {
return s.packResponse(req, nil, response.NewInvalidParamsError("Problem parsing request parameters", err))
}
s.log.Debug("processing rpc request",
zap.String("method", req.Method),
zap.Stringer("params", 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.packResponse(req, res, resErr)
}
func (s *Server) handleWsWrites(ws *websocket.Conn, resChan <-chan response.AbstractResult, subChan <-chan *websocket.PreparedMessage) {
pingTicker := time.NewTicker(wsPingPeriod)
eventloop:
for {
select {
case <-s.shutdown:
break eventloop
case event, ok := <-subChan:
if !ok {
break eventloop
}
if err := ws.SetWriteDeadline(time.Now().Add(wsWriteLimit)); err != nil {
break eventloop
}
if err := ws.WritePreparedMessage(event); err != nil {
break eventloop
}
case res, ok := <-resChan:
if !ok {
break eventloop
}
if err := ws.SetWriteDeadline(time.Now().Add(wsWriteLimit)); err != nil {
break eventloop
}
if err := ws.WriteJSON(res); err != nil {
break eventloop
}
case <-pingTicker.C:
if err := ws.SetWriteDeadline(time.Now().Add(wsWriteLimit)); err != nil {
break eventloop
}
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.AbstractResult, subscr *subscriber) {
ws.SetReadLimit(wsReadLimit)
err := ws.SetReadDeadline(time.Now().Add(wsPongLimit))
ws.SetPongHandler(func(string) error { return ws.SetReadDeadline(time.Now().Add(wsPongLimit)) })
requestloop:
for err == nil {
req := request.NewRequest()
err := ws.ReadJSON(req)
if err != nil {
break
}
res := s.handleRequest(req, subscr)
res.RunForErrors(func(jsonErr *response.Error) {
s.logRequestError(req, jsonErr)
})
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) getBlockHeaderCount(_ request.Params) (interface{}, *response.Error) {
return s.chain.HeaderHeight() + 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 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{
Magic: s.network,
TCPPort: port,
Nonce: s.coreServer.ID(),
UserAgent: s.coreServer.UserAgent,
StateRootInHeader: s.chain.GetConfig().StateRootInHeader,
}, 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(reqParams request.Params) (interface{}, *response.Error) {
verbose := reqParams.Value(0).GetBoolean()
mp := s.chain.GetMemPool()
hashList := make([]util.Uint256, 0)
for _, item := range mp.GetVerifiedTransactions() {
hashList = append(hashList, item.Hash())
}
if !verbose {
return hashList, nil
}
return result.RawMempool{
Height: s.chain.BlockHeight(),
Verified: 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
}
// calculateNetworkFee calculates network fee for the transaction.
func (s *Server) calculateNetworkFee(reqParams request.Params) (interface{}, *response.Error) {
if len(reqParams) < 1 {
return 0, response.ErrInvalidParams
}
byteTx, err := reqParams[0].GetBytesBase64()
if err != nil {
return 0, response.WrapErrorWithData(response.ErrInvalidParams, err)
}
tx, err := transaction.NewTransactionFromBytes(byteTx)
if err != nil {
return 0, response.WrapErrorWithData(response.ErrInvalidParams, err)
}
hashablePart, err := tx.EncodeHashableFields()
if err != nil {
return 0, response.WrapErrorWithData(response.ErrInvalidParams, fmt.Errorf("failed to compute tx size: %w", err))
}
size := len(hashablePart) + io.GetVarSize(len(tx.Signers))
var (
ef int64
netFee int64
)
for i, signer := range tx.Signers {
var verificationScript []byte
for _, w := range tx.Scripts {
if w.VerificationScript != nil && hash.Hash160(w.VerificationScript).Equals(signer.Account) {
// then it's a standard sig/multisig witness
verificationScript = w.VerificationScript
break
}
}
if verificationScript == nil { // then it still might be a contract-based verification
verificationErr := fmt.Sprintf("contract verification for signer #%d failed", i)
res, respErr := s.runScriptInVM(trigger.Verification, tx.Scripts[i].InvocationScript, signer.Account, tx)
if respErr != nil && errors.Is(respErr.Cause, core.ErrUnknownVerificationContract) {
// it's neither a contract-based verification script nor a standard witness attached to
// the tx, so the user did not provide enough data to calculate fee for that witness =>
// it's a user error
return 0, response.NewRPCError(verificationErr, respErr.Cause.Error(), respErr.Cause)
}
if respErr != nil {
return 0, respErr
}
if res.State != "HALT" {
cause := fmt.Errorf("invalid VM state %s due to an error: %s", res.State, res.FaultException)
return 0, response.NewRPCError(verificationErr, cause.Error(), cause)
}
if l := len(res.Stack); l != 1 {
cause := fmt.Errorf("result stack length should be equal to 1, got %d", l)
return 0, response.NewRPCError(verificationErr, cause.Error(), cause)
}
isOK, err := res.Stack[0].TryBool()
if err != nil {
cause := fmt.Errorf("resulting stackitem cannot be converted to Boolean: %w", err)
return 0, response.NewRPCError(verificationErr, cause.Error(), cause)
}
if !isOK {
cause := errors.New("`verify` method returned `false` on stack")
return 0, response.NewRPCError(verificationErr, cause.Error(), cause)
}
netFee += res.GasConsumed
size += io.GetVarSize([]byte{}) + // verification script is empty (contract-based witness)
io.GetVarSize(tx.Scripts[i].InvocationScript) // invocation script might not be empty (args for `verify`)
continue
}
if ef == 0 {
ef = s.chain.GetPolicer().GetBaseExecFee()
}
fee, sizeDelta := fee.Calculate(ef, verificationScript)
netFee += fee
size += sizeDelta
}
fee := s.chain.GetPolicer().FeePerByte()
netFee += int64(size) * fee
return result.NetworkFee{Value: netFee}, nil
}
// getApplicationLog returns the contract log based on the specified txid or blockid.
func (s *Server) getApplicationLog(reqParams request.Params) (interface{}, *response.Error) {
hash, err := reqParams.Value(0).GetUint256()
if err != nil {
return nil, response.ErrInvalidParams
}
trig := trigger.All
if len(reqParams) > 1 {
trigString := reqParams.ValueWithType(1, request.StringT)
if trigString == nil {
return nil, response.ErrInvalidParams
}
trig, err = trigger.FromString(trigString.String())
if err != nil {
return nil, response.ErrInvalidParams
}
}
appExecResults, err := s.chain.GetAppExecResults(hash, trigger.All)
if err != nil {
return nil, response.NewRPCError("Unknown transaction or block", "", err)
}
return result.NewApplicationLog(hash, appExecResults, trig), nil
}
func (s *Server) getNEP17Balances(ps request.Params) (interface{}, *response.Error) {
u, err := ps.Value(0).GetUint160FromAddressOrHex()
if err != nil {
return nil, response.ErrInvalidParams
}
as := s.chain.GetNEP17Balances(u)
bs := &result.NEP17Balances{
Address: address.Uint160ToString(u),
Balances: []result.NEP17Balance{},
}
if as != nil {
cache := make(map[int32]util.Uint160)
for id, bal := range as.Trackers {
h, err := s.getHash(id, cache)
if err != nil {
continue
}
bs.Balances = append(bs.Balances, result.NEP17Balance{
Asset: h,
Amount: bal.Balance.String(),
LastUpdated: bal.LastUpdatedBlock,
})
}
}
return bs, nil
}
func getTimestampsAndLimit(ps request.Params, index int) (uint64, uint64, int, int, error) {
var start, end uint64
var limit, page int
limit = maxTransfersLimit
pStart, pEnd, pLimit, pPage := ps.Value(index), ps.Value(index+1), ps.Value(index+2), ps.Value(index+3)
if pPage != nil {
p, err := pPage.GetInt()
if err != nil {
return 0, 0, 0, 0, err
}
if p < 0 {
return 0, 0, 0, 0, errors.New("can't use negative page")
}
page = p
}
if pLimit != nil {
l, err := pLimit.GetInt()
if err != nil {
return 0, 0, 0, 0, err
}
if l <= 0 {
return 0, 0, 0, 0, errors.New("can't use negative or zero limit")
}
if l > maxTransfersLimit {
return 0, 0, 0, 0, errors.New("too big limit requested")
}
limit = l
}
if pEnd != nil {
val, err := pEnd.GetInt()
if err != nil {
return 0, 0, 0, 0, err
}
end = uint64(val)
} else {
end = uint64(time.Now().Unix() * 1000)
}
if pStart != nil {
val, err := pStart.GetInt()
if err != nil {
return 0, 0, 0, 0, err
}
start = uint64(val)
} else {
start = uint64(time.Now().Add(-time.Hour*24*7).Unix() * 1000)
}
return start, end, limit, page, nil
}
func (s *Server) getNEP17Transfers(ps request.Params) (interface{}, *response.Error) {
u, err := ps.Value(0).GetUint160FromAddressOrHex()
if err != nil {
return nil, response.ErrInvalidParams
}
start, end, limit, page, err := getTimestampsAndLimit(ps, 1)
if err != nil {
return nil, response.NewInvalidParamsError(err.Error(), err)
}
bs := &result.NEP17Transfers{
Address: address.Uint160ToString(u),
Received: []result.NEP17Transfer{},
Sent: []result.NEP17Transfer{},
}
cache := make(map[int32]util.Uint160)
var resCount, frameCount int
err = s.chain.ForEachNEP17Transfer(u, func(tr *state.NEP17Transfer) (bool, error) {
// Iterating from newest to oldest, not yet reached required
// time frame, continue looping.
if tr.Timestamp > end {
return true, nil
}
// Iterating from newest to oldest, moved past required
// time frame, stop looping.
if tr.Timestamp < start {
return false, nil
}
frameCount++
// Using limits, not yet reached required page.
if limit != 0 && page*limit >= frameCount {
return true, nil
}
h, err := s.getHash(tr.Asset, cache)
if err != nil {
return false, err
}
transfer := result.NEP17Transfer{
Timestamp: tr.Timestamp,
Asset: h,
Index: tr.Block,
TxHash: tr.Tx,
}
if tr.Amount.Sign() > 0 { // token was received
transfer.Amount = tr.Amount.String()
if !tr.From.Equals(util.Uint160{}) {
transfer.Address = address.Uint160ToString(tr.From)
}
bs.Received = append(bs.Received, transfer)
} else {
transfer.Amount = new(big.Int).Neg(&tr.Amount).String()
if !tr.To.Equals(util.Uint160{}) {
transfer.Address = address.Uint160ToString(tr.To)
}
bs.Sent = append(bs.Sent, transfer)
}
resCount++
// Using limits, reached limit.
if limit != 0 && resCount >= limit {
return false, nil
}
return true, nil
})
if err != nil {
return nil, response.NewInternalServerError("invalid NEP17 transfer log", err)
}
return bs, nil
}
// getHash returns the hash of the contract by its ID using cache.
func (s *Server) getHash(contractID int32, cache map[int32]util.Uint160) (util.Uint160, error) {
if d, ok := cache[contractID]; ok {
return d, nil
}
h, err := s.chain.GetContractScriptHash(contractID)
if err != nil {
return util.Uint160{}, err
}
cache[contractID] = h
return h, 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
}
if err := checkInt32(id); err != nil {
return 0, response.WrapErrorWithData(response.ErrInvalidParams, err)
}
result = int32(id)
default:
return 0, response.ErrInvalidParams
}
return result, nil
}
// getContractScriptHashFromParam returns the contract script hash by hex contract hash, address, id or native contract name.
func (s *Server) contractScriptHashFromParam(param *request.Param) (util.Uint160, *response.Error) {
var result util.Uint160
if param == nil {
return result, response.ErrInvalidParams
}
switch param.Type {
case request.StringT:
var err error
result, err = param.GetUint160FromAddressOrHex()
if err == nil {
return result, nil
}
name, err := param.GetString()
if err != nil {
return result, response.ErrInvalidParams
}
result, err = s.chain.GetNativeContractScriptHash(name)
if err != nil {
return result, response.NewRPCError("Unknown contract: querying by name is supported for native contracts only", "", nil)
}
case request.NumberT:
id, err := param.GetInt()
if err != nil {
return result, response.ErrInvalidParams
}
if err := checkInt32(id); err != nil {
return result, response.WrapErrorWithData(response.ErrInvalidParams, err)
}
result, err = s.chain.GetContractScriptHash(int32(id))
if err != nil {
return result, response.NewRPCError("Unknown contract", "", err)
}
default:
return result, response.ErrInvalidParams
}
return result, nil
}
func makeStorageKey(id int32, key []byte) []byte {
skey := make([]byte, 4+len(key))
binary.LittleEndian.PutUint32(skey, uint32(id))
copy(skey[4:], key)
return skey
}
var errKeepOnlyLatestState = errors.New("'KeepOnlyLatestState' setting is enabled")
func (s *Server) getProof(ps request.Params) (interface{}, *response.Error) {
if s.chain.GetConfig().KeepOnlyLatestState {
return nil, response.NewInvalidRequestError("'getproof' is not supported", errKeepOnlyLatestState)
}
root, err := ps.Value(0).GetUint256()
if err != nil {
return nil, response.ErrInvalidParams
}
sc, err := ps.Value(1).GetUint160FromHex()
if err != nil {
return nil, response.ErrInvalidParams
}
key, err := ps.Value(2).GetBytesBase64()
if err != nil {
return nil, response.ErrInvalidParams
}
cs := s.chain.GetContractState(sc)
if cs == nil {
return nil, response.ErrInvalidParams
}
skey := makeStorageKey(cs.ID, key)
proof, err := s.chain.GetStateModule().GetStateProof(root, skey)
if err != nil {
return nil, response.NewInternalServerError("failed to get proof", err)
}
return &result.ProofWithKey{
Key: skey,
Proof: proof,
}, nil
}
func (s *Server) verifyProof(ps request.Params) (interface{}, *response.Error) {
if s.chain.GetConfig().KeepOnlyLatestState {
return nil, response.NewInvalidRequestError("'verifyproof' is not supported", errKeepOnlyLatestState)
}
root, err := ps.Value(0).GetUint256()
if err != nil {
return nil, response.ErrInvalidParams
}
proofStr, err := ps.Value(1).GetString()
if err != nil {
return nil, response.ErrInvalidParams
}
var p result.ProofWithKey
if err := p.FromString(proofStr); err != nil {
return nil, response.ErrInvalidParams
}
vp := new(result.VerifyProof)
val, ok := mpt.VerifyProof(root, p.Key, p.Proof)
if ok {
vp.Value = val
}
return vp, nil
}
func (s *Server) getStateHeight(_ request.Params) (interface{}, *response.Error) {
var height = s.chain.BlockHeight()
var stateHeight = s.chain.GetStateModule().CurrentValidatedHeight()
if s.chain.GetConfig().StateRootInHeader {
stateHeight = height - 1
}
return &result.StateHeight{
BlockHeight: height,
StateHeight: stateHeight,
}, nil
}
func (s *Server) getStateRoot(ps request.Params) (interface{}, *response.Error) {
p := ps.Value(0)
if p == nil {
return nil, response.NewRPCError("Invalid parameter.", "", nil)
}
var rt *state.MPTRoot
var h util.Uint256
height, err := p.GetInt()
if err == nil {
if err := checkUint32(height); err != nil {
return nil, response.WrapErrorWithData(response.ErrInvalidParams, err)
}
rt, err = s.chain.GetStateModule().GetStateRoot(uint32(height))
} else if h, err = p.GetUint256(); err == nil {
var hdr *block.Header
hdr, err = s.chain.GetHeader(h)
if err == nil {
rt, err = s.chain.GetStateModule().GetStateRoot(hdr.Index)
}
}
if err != nil {
return nil, response.NewRPCError("Unknown state root.", "", err)
}
return rt, 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).GetBytesBase64()
if err != nil {
return nil, response.ErrInvalidParams
}
item := s.chain.GetStorageItem(id, key)
if item == nil {
return "", nil
}
return []byte(item), nil
}
func (s *Server) getrawtransaction(reqParams request.Params) (interface{}, *response.Error) {
txHash, err := reqParams.Value(0).GetUint256()
if err != nil {
return nil, response.ErrInvalidParams
}
tx, height, err := s.chain.GetTransaction(txHash)
if err != nil {
err = fmt.Errorf("invalid transaction %s: %w", txHash, err)
return nil, response.NewRPCError("Unknown transaction", err.Error(), err)
}
if reqParams.Value(1).GetBoolean() {
if height == math.MaxUint32 {
return result.NewTransactionOutputRaw(tx, nil, nil, s.chain), nil
}
_header := s.chain.GetHeaderHash(int(height))
header, err := s.chain.GetHeader(_header)
if err != nil {
return nil, response.NewRPCError("Failed to get header for the transaction", err.Error(), err)
}
aers, err := s.chain.GetAppExecResults(txHash, trigger.Application)
if err != nil {
return nil, response.NewRPCError("Failed to get application log for the transaction", err.Error(), err)
}
if len(aers) == 0 {
return nil, response.NewRPCError("Application log for the transaction is empty", "", nil)
}
return result.NewTransactionOutputRaw(tx, header, &aers[0], s.chain), nil
}
return tx.Bytes(), nil
}
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 || height == math.MaxUint32 {
return nil, response.NewRPCError("unknown transaction", "", nil)
}
return height, nil
}
// getContractState returns contract state (contract information, according to the contract script hash,
// contract id or native contract name).
func (s *Server) getContractState(reqParams request.Params) (interface{}, *response.Error) {
scriptHash, err := s.contractScriptHashFromParam(reqParams.Value(0))
if err != nil {
return nil, err
}
cs := s.chain.GetContractState(scriptHash)
if cs == nil {
return nil, response.NewRPCError("Unknown contract", "", nil)
}
return cs, nil
}
func (s *Server) getNativeContracts(_ request.Params) (interface{}, *response.Error) {
return s.chain.GetNatives(), 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 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).GetUint160FromAddressOrHex()
if err != nil {
return nil, response.ErrInvalidParams
}
neo, _ := s.chain.GetGoverningTokenBalance(u)
if neo.Sign() == 0 {
return result.UnclaimedGas{
Address: u,
}, nil
}
gas, err := s.chain.CalculateClaimable(u, s.chain.BlockHeight()+1) // +1 as in C#, for the next block.
if err != nil {
return nil, response.NewInternalServerError("can't calculate claimable", err)
}
return result.UnclaimedGas{
Address: u,
Unclaimed: *gas,
}, nil
}
// getNextBlockValidators returns validators for the next block with voting status.
func (s *Server) getNextBlockValidators(_ request.Params) (interface{}, *response.Error) {
var validators keys.PublicKeys
validators, err := s.chain.GetNextBlockValidators()
if err != nil {
return nil, response.NewRPCError("can't get next block validators", "", err)
}
enrollments, err := s.chain.GetEnrollments()
if err != nil {
return nil, response.NewRPCError("can't get enrollments", "", err)
}
var res = make([]result.Validator, 0)
for _, v := range enrollments {
res = append(res, result.Validator{
PublicKey: *v.Key,
Votes: v.Votes.Int64(),
Active: validators.Contains(v.Key),
})
}
return res, nil
}
// getCommittee returns the current list of NEO committee members.
func (s *Server) getCommittee(_ request.Params) (interface{}, *response.Error) {
keys, err := s.chain.GetCommittee()
if err != nil {
return nil, response.NewInternalServerError("can't get committee members", err)
}
return keys, nil
}
// invokeFunction implements the `invokeFunction` RPC call.
func (s *Server) invokeFunction(reqParams request.Params) (interface{}, *response.Error) {
scriptHash, responseErr := s.contractScriptHashFromParam(reqParams.Value(0))
if responseErr != nil {
return nil, responseErr
}
tx := &transaction.Transaction{}
checkWitnessHashesIndex := len(reqParams)
if checkWitnessHashesIndex > 3 {
signers, _, err := reqParams[3].GetSignersWithWitnesses()
if err != nil {
return nil, response.ErrInvalidParams
}
tx.Signers = signers
checkWitnessHashesIndex--
}
if len(tx.Signers) == 0 {
tx.Signers = []transaction.Signer{{Account: util.Uint160{}, Scopes: transaction.None}}
}
script, err := request.CreateFunctionInvocationScript(scriptHash, reqParams[1].String(), reqParams[2:checkWitnessHashesIndex])
if err != nil {
return nil, response.NewInternalServerError("can't create invocation script", err)
}
tx.Script = script
return s.runScriptInVM(trigger.Application, script, util.Uint160{}, tx)
}
// 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].GetBytesBase64()
if err != nil {
return nil, response.ErrInvalidParams
}
tx := &transaction.Transaction{}
if len(reqParams) > 1 {
signers, _, err := reqParams[1].GetSignersWithWitnesses()
if err != nil {
return nil, response.ErrInvalidParams
}
tx.Signers = signers
}
if len(tx.Signers) == 0 {
tx.Signers = []transaction.Signer{{Account: util.Uint160{}, Scopes: transaction.None}}
}
tx.Script = script
return s.runScriptInVM(trigger.Application, script, util.Uint160{}, tx)
}
// invokeContractVerify implements the `invokecontractverify` RPC call.
func (s *Server) invokeContractVerify(reqParams request.Params) (interface{}, *response.Error) {
scriptHash, responseErr := s.contractScriptHashFromParam(reqParams.Value(0))
if responseErr != nil {
return nil, responseErr
}
bw := io.NewBufBinWriter()
if len(reqParams) > 1 {
args, err := reqParams[1].GetArray() // second `invokecontractverify` parameter is an array of arguments for `verify` method
if err != nil {
return nil, response.WrapErrorWithData(response.ErrInvalidParams, err)
}
if len(args) > 0 {
err := request.ExpandArrayIntoScript(bw.BinWriter, args)
if err != nil {
return nil, response.NewRPCError("can't create witness invocation script", err.Error(), err)
}
}
}
invocationScript := bw.Bytes()
tx := &transaction.Transaction{Script: []byte{byte(opcode.RET)}} // need something in script
if len(reqParams) > 2 {
signers, witnesses, err := reqParams[2].GetSignersWithWitnesses()
if err != nil {
return nil, response.ErrInvalidParams
}
tx.Signers = signers
tx.Scripts = witnesses
} else { // fill the only known signer - the contract with `verify` method
tx.Signers = []transaction.Signer{{Account: scriptHash}}
tx.Scripts = []transaction.Witness{{InvocationScript: invocationScript, VerificationScript: []byte{}}}
}
return s.runScriptInVM(trigger.Verification, invocationScript, scriptHash, tx)
}
// runScriptInVM runs given script in a new test VM and returns the invocation
// result. The script is either a simple script in case of `application` trigger
// witness invocation script in case of `verification` trigger (it pushes `verify`
// arguments on stack before verification). In case of contract verification
// contractScriptHash should be specified.
func (s *Server) runScriptInVM(t trigger.Type, script []byte, contractScriptHash util.Uint160, tx *transaction.Transaction) (*result.Invoke, *response.Error) {
// When transferring funds, script execution does no auto GAS claim,
// because it depends on persisting tx height.
// This is why we provide block here.
b := block.New(s.stateRootEnabled)
b.Index = s.chain.BlockHeight() + 1
hdr, err := s.chain.GetHeader(s.chain.GetHeaderHash(int(s.chain.BlockHeight())))
if err != nil {
return nil, response.NewInternalServerError("can't get last block", err)
}
b.Timestamp = hdr.Timestamp + uint64(s.chain.GetConfig().SecondsPerBlock*int(time.Second/time.Millisecond))
vm := s.chain.GetTestVM(t, tx, b)
vm.GasLimit = int64(s.config.MaxGasInvoke)
if t == trigger.Verification {
// We need this special case because witnesses verification is not the simple System.Contract.Call,
// and we need to define exactly the amount of gas consumed for a contract witness verification.
gasPolicy := s.chain.GetPolicer().GetMaxVerificationGAS()
if vm.GasLimit > gasPolicy {
vm.GasLimit = gasPolicy
}
err := s.chain.InitVerificationVM(vm, func(h util.Uint160) (*state.Contract, error) {
res := s.chain.GetContractState(h)
if res == nil {
return nil, fmt.Errorf("unknown contract: %s", h.StringBE())
}
return res, nil
}, contractScriptHash, &transaction.Witness{InvocationScript: script, VerificationScript: []byte{}})
if err != nil {
return nil, response.NewInternalServerError("can't prepare verification VM", err)
}
} else {
vm.LoadScriptWithFlags(script, callflag.All)
}
err = vm.Run()
var faultException string
if err != nil {
faultException = err.Error()
}
return result.NewInvoke(vm, script, faultException, s.config.MaxIteratorResultItems), nil
}
// 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).GetBytesBase64()
if err != nil {
return nil, response.NewInvalidParamsError("missing parameter or not base64", err)
}
b := block.New(s.stateRootEnabled)
r := io.NewBinReaderFromBuf(blockBytes)
b.DecodeBinary(r)
if r.Err != nil {
return nil, response.NewInvalidParamsError("can't decode block", r.Err)
}
err = s.chain.AddBlock(b)
if err != nil {
switch {
case errors.Is(err, core.ErrInvalidBlockIndex) || errors.Is(err, core.ErrAlreadyExists):
return nil, response.WrapErrorWithData(response.ErrAlreadyExists, err)
default:
return nil, response.WrapErrorWithData(response.ErrValidationFailed, err)
}
}
return &result.RelayResult{
Hash: b.Hash(),
}, nil
}
// submitNotaryRequest broadcasts P2PNotaryRequest over the NEO network.
func (s *Server) submitNotaryRequest(ps request.Params) (interface{}, *response.Error) {
if !s.chain.P2PSigExtensionsEnabled() {
return nil, response.NewInternalServerError("P2PNotaryRequest was received, but P2PSignatureExtensions are disabled", nil)
}
if len(ps) < 1 {
return nil, response.NewInvalidParamsError("not enough parameters", nil)
}
bytePayload, err := ps[0].GetBytesBase64()
if err != nil {
return nil, response.NewInvalidParamsError("not base64", err)
}
r, err := payload.NewP2PNotaryRequestFromBytes(bytePayload)
if err != nil {
return nil, response.NewInvalidParamsError("can't decode notary payload", err)
}
return getRelayResult(s.coreServer.RelayP2PNotaryRequest(r), r.FallbackTransaction.Hash())
}
// getRelayResult returns successful relay result or an error.
func getRelayResult(err error, hash util.Uint256) (interface{}, *response.Error) {
switch {
case err == nil:
return result.RelayResult{
Hash: hash,
}, nil
case errors.Is(err, core.ErrAlreadyExists):
return nil, response.WrapErrorWithData(response.ErrAlreadyExists, err)
case errors.Is(err, core.ErrOOM):
return nil, response.WrapErrorWithData(response.ErrOutOfMemory, err)
case errors.Is(err, core.ErrPolicy):
return nil, response.WrapErrorWithData(response.ErrPolicyFail, err)
default:
return nil, response.WrapErrorWithData(response.ErrValidationFailed, err)
}
}
func (s *Server) submitOracleResponse(ps request.Params) (interface{}, *response.Error) {
if s.oracle == nil {
return nil, response.NewInternalServerError("oracle is not enabled", nil)
}
var pub *keys.PublicKey
pubBytes, err := ps.Value(0).GetBytesBase64()
if err == nil {
pub, err = keys.NewPublicKeyFromBytes(pubBytes, elliptic.P256())
}
if err != nil {
return nil, response.NewInvalidParamsError("public key is missing", err)
}
reqID, err := ps.Value(1).GetInt()
if err != nil {
return nil, response.NewInvalidParamsError("request ID is missing", err)
}
txSig, err := ps.Value(2).GetBytesBase64()
if err != nil {
return nil, response.NewInvalidParamsError("tx signature is missing", err)
}
msgSig, err := ps.Value(3).GetBytesBase64()
if err != nil {
return nil, response.NewInvalidParamsError("msg signature is missing", err)
}
data := broadcaster.GetMessage(pubBytes, uint64(reqID), txSig)
if !pub.Verify(msgSig, hash.Sha256(data).BytesBE()) {
return nil, response.NewRPCError("Invalid sign", "", nil)
}
s.oracle.AddResponse(pub, uint64(reqID), txSig)
return json.RawMessage([]byte("{}")), nil
}
func (s *Server) sendrawtransaction(reqParams request.Params) (interface{}, *response.Error) {
if len(reqParams) < 1 {
return nil, response.NewInvalidParamsError("not enough parameters", nil)
}
byteTx, err := reqParams[0].GetBytesBase64()
if err != nil {
return nil, response.NewInvalidParamsError("not base64", err)
}
tx, err := transaction.NewTransactionFromBytes(byteTx)
if err != nil {
return nil, response.NewInvalidParamsError("can't decode transaction", err)
}
return getRelayResult(s.coreServer.RelayTxn(tx), tx.Hash())
}
// 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
}
if event == response.NotaryRequestEventID && !s.chain.P2PSigExtensionsEnabled() {
return nil, response.WrapErrorWithData(response.ErrInvalidParams, errors.New("P2PSigExtensions are disabled"))
}
// 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
}
case response.NotaryRequestEventID:
if p.Type != request.TxFilterT {
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++
case response.NotaryRequestEventID:
if s.notaryRequestSubs == 0 {
s.coreServer.SubscribeForNotaryRequests(s.notaryRequestCh)
}
s.notaryRequestSubs++
}
}
// 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)
}
case response.NotaryRequestEventID:
s.notaryRequestSubs--
if s.notaryRequestSubs == 0 {
s.coreServer.UnsubscribeFromNotaryRequests(s.notaryRequestCh)
}
}
}
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] = execution
case notification := <-s.notificationCh:
resp.Event = response.NotificationEventID
resp.Payload[0] = notification
case tx := <-s.transactionCh:
resp.Event = response.TransactionEventID
resp.Payload[0] = tx
case e := <-s.notaryRequestCh:
resp.Event = response.NotaryRequestEventID
resp.Payload[0] = &response.NotaryRequestEvent{
Type: e.Type,
NotaryRequest: e.Data.(*payload.P2PNotaryRequest),
}
}
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)
if s.chain.P2PSigExtensionsEnabled() {
s.coreServer.UnsubscribeFromNotaryRequests(s.notaryRequestCh)
}
s.subsLock.Unlock()
drainloop:
for {
select {
case <-s.blockCh:
case <-s.executionCh:
case <-s.notificationCh:
case <-s.transactionCh:
case <-s.notaryRequestCh:
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)
close(s.notaryRequestCh)
}
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) packResponse(r *request.In, result interface{}, respErr *response.Error) response.Abstract {
resp := response.Abstract{
HeaderAndError: response.HeaderAndError{
Header: response.Header{
JSONRPC: r.JSONRPC,
ID: r.RawID,
},
},
}
if respErr != nil {
resp.Error = respErr
} else {
resp.Result = result
}
return resp
}
// logRequestError is a request error logger.
func (s *Server) logRequestError(r *request.Request, jsonErr *response.Error) {
logFields := []zap.Field{
zap.Error(jsonErr.Cause),
}
if r.In != nil {
logFields = append(logFields, zap.String("method", r.In.Method))
params, err := r.In.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.packResponse(r, nil, jsonErr)
s.writeHTTPServerResponse(&request.Request{In: r}, w, resp)
}
func (s *Server) writeHTTPServerResponse(r *request.Request, w http.ResponseWriter, resp response.AbstractResult) {
// Errors can happen in many places and we can only catch ALL of them here.
resp.RunForErrors(func(jsonErr *response.Error) {
s.logRequestError(r, jsonErr)
})
if r.In != nil {
resp := resp.(response.Abstract)
if resp.Error != nil {
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 {
switch {
case r.In != nil:
s.log.Error("Error encountered while encoding response",
zap.String("err", err.Error()),
zap.String("method", r.In.Method))
case r.Batch != nil:
s.log.Error("Error encountered while encoding batch response",
zap.String("err", err.Error()))
}
}
}
// 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
}