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server.go
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package rpcsrv
import (
"bytes"
"context"
"crypto/elliptic"
"encoding/binary"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"math"
"math/big"
"net"
"net/http"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/google/uuid"
"github.com/gorilla/websocket"
"github.com/nspcc-dev/neo-go/pkg/config"
"github.com/nspcc-dev/neo-go/pkg/config/limits"
"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/interop"
"github.com/nspcc-dev/neo-go/pkg/core/interop/iterator"
"github.com/nspcc-dev/neo-go/pkg/core/mempool"
"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/native"
"github.com/nspcc-dev/neo-go/pkg/core/state"
"github.com/nspcc-dev/neo-go/pkg/core/storage"
"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/neorpc"
"github.com/nspcc-dev/neo-go/pkg/neorpc/result"
"github.com/nspcc-dev/neo-go/pkg/neorpc/rpcevent"
"github.com/nspcc-dev/neo-go/pkg/network"
"github.com/nspcc-dev/neo-go/pkg/network/payload"
"github.com/nspcc-dev/neo-go/pkg/services/oracle/broadcaster"
"github.com/nspcc-dev/neo-go/pkg/services/rpcsrv/params"
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/callflag"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest/standard"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/util/slice"
"github.com/nspcc-dev/neo-go/pkg/vm"
"github.com/nspcc-dev/neo-go/pkg/vm/emit"
"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
"go.uber.org/zap"
)
type (
// Ledger abstracts away the Blockchain as used by the RPC server.
Ledger interface {
AddBlock(block *block.Block) error
BlockHeight() uint32
CalculateClaimable(h util.Uint160, endHeight uint32) (*big.Int, error)
CurrentBlockHash() util.Uint256
FeePerByte() int64
ForEachNEP11Transfer(acc util.Uint160, newestTimestamp uint64, f func(*state.NEP11Transfer) (bool, error)) error
ForEachNEP17Transfer(acc util.Uint160, newestTimestamp uint64, f func(*state.NEP17Transfer) (bool, error)) error
GetAppExecResults(util.Uint256, trigger.Type) ([]state.AppExecResult, error)
GetBaseExecFee() int64
GetBlock(hash util.Uint256) (*block.Block, error)
GetCommittee() (keys.PublicKeys, error)
GetConfig() config.Blockchain
GetContractScriptHash(id int32) (util.Uint160, error)
GetContractState(hash util.Uint160) *state.Contract
GetEnrollments() ([]state.Validator, error)
GetGoverningTokenBalance(acc util.Uint160) (*big.Int, uint32)
GetHeader(hash util.Uint256) (*block.Header, error)
GetHeaderHash(uint32) util.Uint256
GetMaxVerificationGAS() int64
GetMemPool() *mempool.Pool
GetNEP11Contracts() []util.Uint160
GetNEP17Contracts() []util.Uint160
GetNativeContractScriptHash(string) (util.Uint160, error)
GetNatives() []state.NativeContract
GetNextBlockValidators() ([]*keys.PublicKey, error)
GetNotaryContractScriptHash() util.Uint160
GetNotaryServiceFeePerKey() int64
GetStateModule() core.StateRoot
GetStorageItem(id int32, key []byte) state.StorageItem
GetTestHistoricVM(t trigger.Type, tx *transaction.Transaction, nextBlockHeight uint32) (*interop.Context, error)
GetTestVM(t trigger.Type, tx *transaction.Transaction, b *block.Block) (*interop.Context, error)
GetTokenLastUpdated(acc util.Uint160) (map[int32]uint32, error)
GetTransaction(util.Uint256) (*transaction.Transaction, uint32, error)
HeaderHeight() uint32
InitVerificationContext(ic *interop.Context, hash util.Uint160, witness *transaction.Witness) error
P2PSigExtensionsEnabled() bool
SubscribeForBlocks(ch chan *block.Block)
SubscribeForExecutions(ch chan *state.AppExecResult)
SubscribeForNotifications(ch chan *state.ContainedNotificationEvent)
SubscribeForTransactions(ch chan *transaction.Transaction)
UnsubscribeFromBlocks(ch chan *block.Block)
UnsubscribeFromExecutions(ch chan *state.AppExecResult)
UnsubscribeFromNotifications(ch chan *state.ContainedNotificationEvent)
UnsubscribeFromTransactions(ch chan *transaction.Transaction)
VerifyTx(*transaction.Transaction) error
VerifyWitness(util.Uint160, hash.Hashable, *transaction.Witness, int64) (int64, error)
mempool.Feer // fee interface
ContractStorageSeeker
}
// ContractStorageSeeker is the interface `findstorage*` handlers need to be able to
// seek over contract storage.
ContractStorageSeeker interface {
SeekStorage(id int32, prefix []byte, cont func(k, v []byte) bool)
}
// OracleHandler is the interface oracle service needs to provide for the Server.
OracleHandler interface {
AddResponse(pub *keys.PublicKey, reqID uint64, txSig []byte)
}
// Server represents the JSON-RPC 2.0 server.
Server struct {
http []*http.Server
https []*http.Server
chain Ledger
config config.RPC
// wsReadLimit represents web-socket message limit for a receiving side.
wsReadLimit int64
upgrader websocket.Upgrader
network netmode.Magic
stateRootEnabled bool
coreServer *network.Server
oracle *atomic.Value
log *zap.Logger
shutdown chan struct{}
started atomic.Bool
errChan chan<- error
sessionsLock sync.Mutex
sessions map[string]*session
subsLock sync.RWMutex
subscribers map[*subscriber]bool
subsCounterLock sync.RWMutex
blockSubs int
executionSubs int
notificationSubs int
transactionSubs int
notaryRequestSubs int
blockCh chan *block.Block
executionCh chan *state.AppExecResult
notificationCh chan *state.ContainedNotificationEvent
transactionCh chan *transaction.Transaction
notaryRequestCh chan mempoolevent.Event
subEventsToExitCh chan struct{}
}
// session holds a set of iterators got after invoke* call with corresponding
// finalizer and session expiration timer.
session struct {
// iteratorsLock protects iteratorIdentifiers of the current session.
iteratorsLock sync.Mutex
// iteratorIdentifiers stores the set of Iterator stackitems got either from original invocation
// or from historic MPT-based invocation. In the second case, iteratorIdentifiers are supposed
// to be filled during the first `traverseiterator` call using corresponding params.
iteratorIdentifiers []*iteratorIdentifier
timer *time.Timer
finalize func()
}
// iteratorIdentifier represents Iterator on the server side, holding iterator ID and Iterator stackitem.
iteratorIdentifier struct {
ID string
// Item represents Iterator stackitem.
Item stackitem.Item
}
)
const (
// Disconnection timeout.
wsPongLimit = 60 * time.Second
// Ping period for connection liveness check.
wsPingPeriod = wsPongLimit / 2
// Write deadline.
wsWriteLimit = wsPingPeriod / 2
// Default maximum number of websocket clients per Server.
defaultMaxWebSocketClients = 64
// Maximum number of elements for get*transfers requests.
maxTransfersLimit = 1000
// defaultSessionPoolSize is the number of concurrently running iterator sessions.
defaultSessionPoolSize = 20
)
var rpcHandlers = map[string]func(*Server, params.Params) (any, *neorpc.Error){
"calculatenetworkfee": (*Server).calculateNetworkFee,
"findstates": (*Server).findStates,
"findstorage": (*Server).findStorage,
"findstoragehistoric": (*Server).findStorageHistoric,
"getapplicationlog": (*Server).getApplicationLog,
"getbestblockhash": (*Server).getBestBlockHash,
"getblock": (*Server).getBlock,
"getblockcount": (*Server).getBlockCount,
"getblockhash": (*Server).getBlockHash,
"getblockheader": (*Server).getBlockHeader,
"getblockheadercount": (*Server).getBlockHeaderCount,
"getblocksysfee": (*Server).getBlockSysFee,
"getcandidates": (*Server).getCandidates,
"getcommittee": (*Server).getCommittee,
"getconnectioncount": (*Server).getConnectionCount,
"getcontractstate": (*Server).getContractState,
"getnativecontracts": (*Server).getNativeContracts,
"getnep11balances": (*Server).getNEP11Balances,
"getnep11properties": (*Server).getNEP11Properties,
"getnep11transfers": (*Server).getNEP11Transfers,
"getnep17balances": (*Server).getNEP17Balances,
"getnep17transfers": (*Server).getNEP17Transfers,
"getpeers": (*Server).getPeers,
"getproof": (*Server).getProof,
"getrawmempool": (*Server).getRawMempool,
"getrawnotarypool": (*Server).getRawNotaryPool,
"getrawnotarytransaction": (*Server).getRawNotaryTransaction,
"getrawtransaction": (*Server).getrawtransaction,
"getstate": (*Server).getState,
"getstateheight": (*Server).getStateHeight,
"getstateroot": (*Server).getStateRoot,
"getstorage": (*Server).getStorage,
"getstoragehistoric": (*Server).getStorageHistoric,
"gettransactionheight": (*Server).getTransactionHeight,
"getunclaimedgas": (*Server).getUnclaimedGas,
"getnextblockvalidators": (*Server).getNextBlockValidators,
"getversion": (*Server).getVersion,
"invokefunction": (*Server).invokeFunction,
"invokefunctionhistoric": (*Server).invokeFunctionHistoric,
"invokescript": (*Server).invokescript,
"invokescripthistoric": (*Server).invokescripthistoric,
"invokecontractverify": (*Server).invokeContractVerify,
"invokecontractverifyhistoric": (*Server).invokeContractVerifyHistoric,
"sendrawtransaction": (*Server).sendrawtransaction,
"submitblock": (*Server).submitBlock,
"submitnotaryrequest": (*Server).submitNotaryRequest,
"submitoracleresponse": (*Server).submitOracleResponse,
"terminatesession": (*Server).terminateSession,
"traverseiterator": (*Server).traverseIterator,
"validateaddress": (*Server).validateAddress,
"verifyproof": (*Server).verifyProof,
}
var rpcWsHandlers = map[string]func(*Server, params.Params, *subscriber) (any, *neorpc.Error){
"subscribe": (*Server).subscribe,
"unsubscribe": (*Server).unsubscribe,
}
// New creates a new Server struct. Pay attention that orc is expected to be either
// untyped nil or non-nil structure implementing OracleHandler interface.
func New(chain Ledger, conf config.RPC, coreServer *network.Server,
orc OracleHandler, log *zap.Logger, errChan chan<- error) Server {
addrs := conf.Addresses
httpServers := make([]*http.Server, len(addrs))
for i, addr := range addrs {
httpServers[i] = &http.Server{
Addr: addr,
}
}
var tlsServers []*http.Server
if cfg := conf.TLSConfig; cfg.Enabled {
addrs := cfg.Addresses
tlsServers = make([]*http.Server, len(addrs))
for i, addr := range addrs {
tlsServers[i] = &http.Server{
Addr: addr,
}
}
}
protoCfg := chain.GetConfig().ProtocolConfiguration
if conf.SessionEnabled {
if conf.SessionExpirationTime <= 0 {
conf.SessionExpirationTime = int(protoCfg.TimePerBlock / time.Second)
log.Info("SessionExpirationTime is not set or wrong, setting default value", zap.Int("SessionExpirationTime", conf.SessionExpirationTime))
}
if conf.SessionPoolSize <= 0 {
conf.SessionPoolSize = defaultSessionPoolSize
log.Info("SessionPoolSize is not set or wrong, setting default value", zap.Int("SessionPoolSize", defaultSessionPoolSize))
}
}
if conf.MaxIteratorResultItems <= 0 {
conf.MaxIteratorResultItems = config.DefaultMaxIteratorResultItems
log.Info("MaxIteratorResultItems is not set or wrong, setting default value", zap.Int("MaxIteratorResultItems", config.DefaultMaxIteratorResultItems))
}
if conf.MaxFindResultItems <= 0 {
conf.MaxFindResultItems = config.DefaultMaxFindResultItems
log.Info("MaxFindResultItems is not set or wrong, setting default value", zap.Int("MaxFindResultItems", config.DefaultMaxFindResultItems))
}
if conf.MaxFindStorageResultItems <= 0 {
conf.MaxFindStorageResultItems = config.DefaultMaxFindStorageResultItems
log.Info("MaxFindStorageResultItems is not set or wrong, setting default value", zap.Int("MaxFindStorageResultItems", config.DefaultMaxFindStorageResultItems))
}
if conf.MaxNEP11Tokens <= 0 {
conf.MaxNEP11Tokens = config.DefaultMaxNEP11Tokens
log.Info("MaxNEP11Tokens is not set or wrong, setting default value", zap.Int("MaxNEP11Tokens", config.DefaultMaxNEP11Tokens))
}
if conf.MaxWebSocketClients == 0 {
conf.MaxWebSocketClients = defaultMaxWebSocketClients
log.Info("MaxWebSocketClients is not set or wrong, setting default value", zap.Int("MaxWebSocketClients", defaultMaxWebSocketClients))
}
var oracleWrapped = new(atomic.Value)
if orc != nil {
oracleWrapped.Store(orc)
}
var wsOriginChecker func(*http.Request) bool
if conf.EnableCORSWorkaround {
wsOriginChecker = func(_ *http.Request) bool { return true }
}
return Server{
http: httpServers,
https: tlsServers,
chain: chain,
config: conf,
wsReadLimit: int64(protoCfg.MaxBlockSize*4)/3 + 1024, // Enough for Base64-encoded content of `submitblock` and `submitp2pnotaryrequest`.
upgrader: websocket.Upgrader{CheckOrigin: wsOriginChecker},
network: protoCfg.Magic,
stateRootEnabled: protoCfg.StateRootInHeader,
coreServer: coreServer,
log: log,
oracle: oracleWrapped,
shutdown: make(chan struct{}),
errChan: errChan,
sessions: make(map[string]*session),
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.ContainedNotificationEvent),
transactionCh: make(chan *transaction.Transaction),
notaryRequestCh: make(chan mempoolevent.Event),
subEventsToExitCh: make(chan struct{}),
}
}
// Name returns service name.
func (s *Server) Name() string {
return "rpc"
}
// Start creates a new JSON-RPC server listening on the configured port. It creates
// goroutines needed internally and it returns its errors via errChan passed to New().
// The Server only starts once, subsequent calls to Start are no-op.
func (s *Server) Start() {
if !s.config.Enabled {
s.log.Info("RPC server is not enabled")
return
}
if !s.started.CompareAndSwap(false, true) {
s.log.Info("RPC server already started")
return
}
go s.handleSubEvents()
for _, srv := range s.http {
srv.Handler = http.HandlerFunc(s.handleHTTPRequest)
s.log.Info("starting rpc-server", zap.String("endpoint", srv.Addr))
ln, err := net.Listen("tcp", srv.Addr)
if err != nil {
s.errChan <- fmt.Errorf("failed to listen on %s: %w", srv.Addr, err)
return
}
srv.Addr = ln.Addr().String() // set Addr to the actual address
go func(server *http.Server) {
err = server.Serve(ln)
if !errors.Is(err, http.ErrServerClosed) {
s.log.Error("failed to start RPC server", zap.Error(err))
s.errChan <- err
}
}(srv)
}
if cfg := s.config.TLSConfig; cfg.Enabled {
for _, srv := range s.https {
srv.Handler = http.HandlerFunc(s.handleHTTPRequest)
s.log.Info("starting rpc-server (https)", zap.String("endpoint", srv.Addr))
ln, err := net.Listen("tcp", srv.Addr)
if err != nil {
s.errChan <- err
return
}
srv.Addr = ln.Addr().String()
go func(srv *http.Server) {
err = srv.ServeTLS(ln, cfg.CertFile, cfg.KeyFile)
if !errors.Is(err, http.ErrServerClosed) {
s.log.Error("failed to start TLS RPC server",
zap.String("endpoint", srv.Addr), zap.Error(err))
s.errChan <- err
}
}(srv)
}
}
}
// Shutdown stops the RPC server if it's running. It can only be called once,
// subsequent calls to Shutdown on the same instance are no-op. The instance
// that was stopped can not be started again by calling Start (use a new
// instance if needed).
func (s *Server) Shutdown() {
if !s.started.CompareAndSwap(true, false) {
return
}
// Signal to websocket writer routines and handleSubEvents.
close(s.shutdown)
if s.config.TLSConfig.Enabled {
for _, srv := range s.https {
s.log.Info("shutting down RPC server (https)", zap.String("endpoint", srv.Addr))
err := srv.Shutdown(context.Background())
if err != nil {
s.log.Warn("error during RPC (https) server shutdown",
zap.String("endpoint", srv.Addr), zap.Error(err))
}
}
}
for _, srv := range s.http {
s.log.Info("shutting down RPC server", zap.String("endpoint", srv.Addr))
err := srv.Shutdown(context.Background())
if err != nil {
s.log.Warn("error during RPC (http) server shutdown",
zap.String("endpoint", srv.Addr), zap.Error(err))
}
}
// Perform sessions finalisation.
if s.config.SessionEnabled {
s.sessionsLock.Lock()
for _, session := range s.sessions {
// Concurrent iterator traversal may still be in process, thus need to protect iteratorIdentifiers access.
session.iteratorsLock.Lock()
session.finalize()
if !session.timer.Stop() {
<-session.timer.C
}
session.iteratorsLock.Unlock()
}
s.sessions = nil
s.sessionsLock.Unlock()
}
// Wait for handleSubEvents to finish.
<-s.subEventsToExitCh
}
// SetOracleHandler allows to update oracle handler used by the Server.
func (s *Server) SetOracleHandler(orc OracleHandler) {
s.oracle.Store(orc)
}
func (s *Server) handleHTTPRequest(w http.ResponseWriter, httpRequest *http.Request) {
req := params.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 >= s.config.MaxWebSocketClients {
s.writeHTTPErrorResponse(
params.NewIn(),
w,
neorpc.NewInternalServerError("websocket users limit reached"),
)
return
}
ws, err := s.upgrader.Upgrade(w, httpRequest, nil)
if err != nil {
s.log.Info("websocket connection upgrade failed", zap.Error(err))
return
}
resChan := make(chan abstractResult) // response.abstract or response.abstractBatch
subChan := make(chan intEvent, notificationBufSize)
subscr := &subscriber{writer: subChan}
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 == "OPTIONS" && s.config.EnableCORSWorkaround { // Preflight CORS.
setCORSOriginHeaders(w.Header())
w.Header().Set("Access-Control-Allow-Methods", "GET, POST") // GET for websockets.
w.Header().Set("Access-Control-Max-Age", "21600") // 6 hours.
return
}
if httpRequest.Method != "POST" {
s.writeHTTPErrorResponse(
params.NewIn(),
w,
neorpc.NewInvalidParamsError(fmt.Sprintf("invalid method '%s', please retry with 'POST'", httpRequest.Method)),
)
return
}
err := req.DecodeData(httpRequest.Body)
if err != nil {
s.writeHTTPErrorResponse(params.NewIn(), w, neorpc.NewParseError(err.Error()))
return
}
resp := s.handleRequest(req, nil)
s.writeHTTPServerResponse(req, w, resp)
}
// RegisterLocal performs local client registration.
func (s *Server) RegisterLocal(ctx context.Context, events chan<- neorpc.Notification) func(*neorpc.Request) (*neorpc.Response, error) {
subChan := make(chan intEvent, notificationBufSize)
subscr := &subscriber{writer: subChan}
s.subsLock.Lock()
s.subscribers[subscr] = true
s.subsLock.Unlock()
go s.handleLocalNotifications(ctx, events, subChan, subscr)
return func(req *neorpc.Request) (*neorpc.Response, error) {
return s.handleInternal(req, subscr)
}
}
func (s *Server) handleRequest(req *params.Request, sub *subscriber) abstractResult {
if req.In != nil {
req.In.Method = escapeForLog(req.In.Method) // No valid method name will be changed by it.
return s.handleIn(req.In, sub)
}
resp := make(abstractBatch, len(req.Batch))
for i, in := range req.Batch {
in.Method = escapeForLog(in.Method) // No valid method name will be changed by it.
resp[i] = s.handleIn(&in, sub)
}
return resp
}
// handleInternal is an experimental interface to handle client requests directly.
func (s *Server) handleInternal(req *neorpc.Request, sub *subscriber) (*neorpc.Response, error) {
var (
res any
rpcRes = &neorpc.Response{
HeaderAndError: neorpc.HeaderAndError{
Header: neorpc.Header{
JSONRPC: req.JSONRPC,
ID: json.RawMessage(strconv.FormatUint(req.ID, 10)),
},
},
}
)
reqParams, err := params.FromAny(req.Params)
if err != nil {
return nil, err
}
s.log.Debug("processing local rpc request",
zap.String("method", req.Method),
zap.Stringer("params", reqParams))
start := time.Now()
defer func() { addReqTimeMetric(req.Method, time.Since(start)) }()
rpcRes.Error = neorpc.NewMethodNotFoundError(fmt.Sprintf("method %q not supported", req.Method))
handler, ok := rpcHandlers[req.Method]
if ok {
res, rpcRes.Error = handler(s, reqParams)
} else if sub != nil {
handler, ok := rpcWsHandlers[req.Method]
if ok {
res, rpcRes.Error = handler(s, reqParams, sub)
}
}
if res != nil {
b, err := json.Marshal(res)
if err != nil {
return nil, fmt.Errorf("response can't be JSONized: %w", err)
}
rpcRes.Result = json.RawMessage(b)
}
return rpcRes, nil
}
func (s *Server) handleIn(req *params.In, sub *subscriber) abstract {
var res any
var resErr *neorpc.Error
if req.JSONRPC != neorpc.JSONRPCVersion {
return s.packResponse(req, nil, neorpc.NewInvalidParamsError(fmt.Sprintf("problem parsing JSON: invalid version, expected 2.0 got '%s'", req.JSONRPC)))
}
reqParams := params.Params(req.RawParams)
s.log.Debug("processing rpc request",
zap.String("method", req.Method),
zap.Stringer("params", reqParams))
start := time.Now()
defer func() { addReqTimeMetric(req.Method, time.Since(start)) }()
resErr = neorpc.NewMethodNotFoundError(fmt.Sprintf("method %q not supported", req.Method))
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) handleLocalNotifications(ctx context.Context, events chan<- neorpc.Notification, subChan <-chan intEvent, subscr *subscriber) {
eventloop:
for {
select {
case <-s.shutdown:
break eventloop
case <-ctx.Done():
break eventloop
case ev := <-subChan:
events <- *ev.ntf // Make a copy.
}
}
close(events)
s.dropSubscriber(subscr)
drainloop:
for {
select {
case <-subChan:
default:
break drainloop
}
}
}
func (s *Server) handleWsWrites(ws *websocket.Conn, resChan <-chan abstractResult, subChan <-chan intEvent) {
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.msg); 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<- abstractResult, subscr *subscriber) {
ws.SetReadLimit(s.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 := params.NewRequest()
err := ws.ReadJSON(req)
if err != nil {
break
}
res := s.handleRequest(req, subscr)
res.RunForErrors(func(jsonErr *neorpc.Error) {
s.logRequestError(req, jsonErr)
})
select {
case <-s.shutdown:
break requestloop
case resChan <- res:
}
}
s.dropSubscriber(subscr)
close(resChan)
ws.Close()
}
func (s *Server) dropSubscriber(subscr *subscriber) {
s.subsLock.Lock()
delete(s.subscribers, subscr)
s.subsLock.Unlock()
s.subsCounterLock.Lock()
for _, e := range subscr.feeds {
if e.event != neorpc.InvalidEventID {
s.unsubscribeFromChannel(e.event)
}
}
s.subsCounterLock.Unlock()
}
func (s *Server) getBestBlockHash(_ params.Params) (any, *neorpc.Error) {
return "0x" + s.chain.CurrentBlockHash().StringLE(), nil
}
func (s *Server) getBlockCount(_ params.Params) (any, *neorpc.Error) {
return s.chain.BlockHeight() + 1, nil
}
func (s *Server) getBlockHeaderCount(_ params.Params) (any, *neorpc.Error) {
return s.chain.HeaderHeight() + 1, nil
}
func (s *Server) getConnectionCount(_ params.Params) (any, *neorpc.Error) {
return s.coreServer.PeerCount(), nil
}
func (s *Server) blockHashFromParam(param *params.Param) (util.Uint256, *neorpc.Error) {
var (
hash util.Uint256
err error
)
if param == nil {
return hash, neorpc.ErrInvalidParams
}
if hash, err = param.GetUint256(); err != nil {
num, respErr := s.blockHeightFromParam(param)
if respErr != nil {
return hash, respErr
}
hash = s.chain.GetHeaderHash(num)
}
return hash, nil
}
func (s *Server) fillBlockMetadata(obj io.Serializable, h *block.Header) result.BlockMetadata {
res := result.BlockMetadata{
Size: io.GetVarSize(obj), // obj can be a Block or a Header.
Confirmations: s.chain.BlockHeight() - h.Index + 1,
}
hash := s.chain.GetHeaderHash(h.Index + 1)
if !hash.Equals(util.Uint256{}) {
res.NextBlockHash = &hash
}
return res
}
func (s *Server) getBlock(reqParams params.Params) (any, *neorpc.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, neorpc.WrapErrorWithData(neorpc.ErrUnknownBlock, err.Error())
}
if v, _ := reqParams.Value(1).GetBoolean(); v {
res := result.Block{
Block: *block,
BlockMetadata: s.fillBlockMetadata(block, &block.Header),
}
return res, nil
}
writer := io.NewBufBinWriter()
block.EncodeBinary(writer.BinWriter)
return writer.Bytes(), nil
}
func (s *Server) getBlockHash(reqParams params.Params) (any, *neorpc.Error) {
num, err := s.blockHeightFromParam(reqParams.Value(0))
if err != nil {
return nil, err
}
return s.chain.GetHeaderHash(num), nil
}
func (s *Server) getVersion(_ params.Params) (any, *neorpc.Error) {
port, err := s.coreServer.Port(nil) // any port will suite
if err != nil {
return nil, neorpc.NewInternalServerError(fmt.Sprintf("cannot fetch tcp port: %s", err))
}
cfg := s.chain.GetConfig()
hfs := make(map[config.Hardfork]uint32, len(cfg.Hardforks))
for _, cfgHf := range config.Hardforks {
height, ok := cfg.Hardforks[cfgHf.String()]
if !ok {
continue
}
hfs[cfgHf] = height
}
return &result.Version{
TCPPort: port,
Nonce: s.coreServer.ID(),
UserAgent: s.coreServer.UserAgent,
Protocol: result.Protocol{
AddressVersion: address.NEO3Prefix,
Network: cfg.Magic,
MillisecondsPerBlock: int(cfg.TimePerBlock / time.Millisecond),
MaxTraceableBlocks: cfg.MaxTraceableBlocks,
MaxValidUntilBlockIncrement: cfg.MaxValidUntilBlockIncrement,
MaxTransactionsPerBlock: cfg.MaxTransactionsPerBlock,
MemoryPoolMaxTransactions: cfg.MemPoolSize,
ValidatorsCount: byte(cfg.GetNumOfCNs(s.chain.BlockHeight())),
InitialGasDistribution: cfg.InitialGASSupply,
Hardforks: hfs,
CommitteeHistory: cfg.CommitteeHistory,
P2PSigExtensions: cfg.P2PSigExtensions,
StateRootInHeader: cfg.StateRootInHeader,
ValidatorsHistory: cfg.ValidatorsHistory,
},
}, nil
}
func (s *Server) getPeers(_ params.Params) (any, *neorpc.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 params.Params) (any, *neorpc.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,
Unverified: []util.Uint256{}, // avoid `null` result
}, nil
}
func (s *Server) validateAddress(reqParams params.Params) (any, *neorpc.Error) {
param, err := reqParams.Value(0).GetString()
if err != nil {
return nil, neorpc.ErrInvalidParams
}
return result.ValidateAddress{
Address: reqParams.Value(0),
IsValid: validateAddress(param),
}, nil
}
// calculateNetworkFee calculates network fee for the transaction.
func (s *Server) calculateNetworkFee(reqParams params.Params) (any, *neorpc.Error) {
if len(reqParams) < 1 {
return 0, neorpc.ErrInvalidParams
}
byteTx, err := reqParams[0].GetBytesBase64()
if err != nil {
return 0, neorpc.WrapErrorWithData(neorpc.ErrInvalidParams, err.Error())
}
tx, err := transaction.NewTransactionFromBytes(byteTx)
if err != nil {
return 0, neorpc.WrapErrorWithData(neorpc.ErrInvalidParams, err.Error())
}
hashablePart, err := tx.EncodeHashableFields()
if err != nil {
return 0, neorpc.WrapErrorWithData(neorpc.ErrInvalidParams, fmt.Sprintf("failed to compute tx size: %s", err))
}
size := len(hashablePart) + io.GetVarSize(len(tx.Signers))
var (
netFee int64
// Verification GAS cost can't exceed this policy.
gasLimit = s.chain.GetMaxVerificationGAS()
)
if gasLimit > int64(s.config.MaxGasInvoke) {
// But we honor instance configuration as well.
gasLimit = int64(s.config.MaxGasInvoke)
}
for i, signer := range tx.Signers {
w := tx.Scripts[i]
if len(w.InvocationScript) == 0 { // No invocation provided, try to infer one.
var paramz []manifest.Parameter
if len(w.VerificationScript) == 0 { // Contract-based verification
cs := s.chain.GetContractState(signer.Account)
if cs == nil {
return 0, neorpc.WrapErrorWithData(neorpc.ErrInvalidVerificationFunction, fmt.Sprintf("signer %d has no verification script and no deployed contract", i))
}
md := cs.Manifest.ABI.GetMethod(manifest.MethodVerify, -1)
if md == nil || md.ReturnType != smartcontract.BoolType {
return 0, neorpc.WrapErrorWithData(neorpc.ErrInvalidVerificationFunction, fmt.Sprintf("signer %d has no verify method in deployed contract", i))
}
paramz = md.Parameters // Might as well have none params and it's OK.
} else { // Regular signature verification.
if vm.IsSignatureContract(w.VerificationScript) {
paramz = []manifest.Parameter{{Type: smartcontract.SignatureType}}
} else if nSigs, _, ok := vm.ParseMultiSigContract(w.VerificationScript); ok {
paramz = make([]manifest.Parameter, nSigs)
for j := 0; j < nSigs; j++ {
paramz[j] = manifest.Parameter{Type: smartcontract.SignatureType}
}
}
}
inv := io.NewBufBinWriter()
for _, p := range paramz {
p.Type.EncodeDefaultValue(inv.BinWriter)
}
if inv.Err != nil {
return nil, neorpc.NewInternalServerError(fmt.Sprintf("failed to create dummy invocation script (signer %d): %s", i, inv.Err.Error()))
}
w.InvocationScript = inv.Bytes()
}
gasConsumed, err := s.chain.VerifyWitness(signer.Account, tx, &w, gasLimit)
if err != nil && !errors.Is(err, core.ErrInvalidSignature) {
return nil, neorpc.WrapErrorWithData(neorpc.ErrInvalidSignature, err.Error())
}
gasLimit -= gasConsumed
netFee += gasConsumed
size += io.GetVarSize(w.VerificationScript) + io.GetVarSize(w.InvocationScript)
}
if s.chain.P2PSigExtensionsEnabled() {
attrs := tx.GetAttributes(transaction.NotaryAssistedT)
if len(attrs) != 0 {
na := attrs[0].Value.(*transaction.NotaryAssisted)
netFee += (int64(na.NKeys) + 1) * s.chain.GetNotaryServiceFeePerKey()
}
}
fee := s.chain.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 params.Params) (any, *neorpc.Error) {
hash, err := reqParams.Value(0).GetUint256()
if err != nil {
return nil, neorpc.ErrInvalidParams
}
trig := trigger.All
if len(reqParams) > 1 {
trigString, err := reqParams.Value(1).GetString()
if err != nil {