neo-go/pkg/rpc/server.go
Roman Khimov d1a4e43c48 io: redo Serializable to return errors in BinReader/BinWriter
Further simplifies error handling.
2019-09-17 13:21:52 +03:00

331 lines
8.5 KiB
Go

package rpc
import (
"context"
"encoding/hex"
"fmt"
"net/http"
"strconv"
"github.com/CityOfZion/neo-go/pkg/core"
"github.com/CityOfZion/neo-go/pkg/core/transaction"
"github.com/CityOfZion/neo-go/pkg/crypto"
"github.com/CityOfZion/neo-go/pkg/io"
"github.com/CityOfZion/neo-go/pkg/network"
"github.com/CityOfZion/neo-go/pkg/rpc/result"
"github.com/CityOfZion/neo-go/pkg/rpc/wrappers"
"github.com/CityOfZion/neo-go/pkg/util"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
)
type (
// Server represents the JSON-RPC 2.0 server.
Server struct {
*http.Server
chain core.Blockchainer
coreServer *network.Server
}
)
var (
invalidBlockHeightError = func(index int, height int) error {
return errors.Errorf("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)
}
)
// NewServer creates a new Server struct.
func NewServer(chain core.Blockchainer, port uint16, coreServer *network.Server) Server {
return Server{
Server: &http.Server{
Addr: ":" + strconv.FormatUint(uint64(port), 10),
},
chain: chain,
coreServer: coreServer,
}
}
// Start creates a new JSON-RPC server
// listening on the configured port.
func (s *Server) Start(errChan chan error) {
s.Handler = http.HandlerFunc(s.requestHandler)
log.WithFields(log.Fields{
"endpoint": s.Addr,
}).Info("starting rpc-server")
errChan <- s.ListenAndServe()
}
// Shutdown override the http.Server Shutdown
// method.
func (s *Server) Shutdown() error {
log.WithFields(log.Fields{
"endpoint": s.Addr,
}).Info("shutting down rpc-server")
return s.Server.Shutdown(context.Background())
}
func (s *Server) requestHandler(w http.ResponseWriter, httpRequest *http.Request) {
req := NewRequest()
if httpRequest.Method != "POST" {
req.WriteErrorResponse(
w,
NewInvalidParamsError(
fmt.Sprintf("Invalid method '%s', please retry with 'POST'", httpRequest.Method), nil,
),
)
return
}
err := req.DecodeData(httpRequest.Body)
if err != nil {
req.WriteErrorResponse(w, NewParseError("Problem parsing JSON-RPC request body", err))
return
}
reqParams, err := req.Params()
if err != nil {
req.WriteErrorResponse(w, NewInvalidParamsError("Problem parsing request parameters", err))
return
}
s.methodHandler(w, req, *reqParams)
}
func (s *Server) methodHandler(w http.ResponseWriter, req *Request, reqParams Params) {
log.WithFields(log.Fields{
"method": req.Method,
"params": fmt.Sprintf("%v", reqParams),
}).Info("processing rpc request")
var (
results interface{}
resultsErr error
)
Methods:
switch req.Method {
case "getbestblockhash":
results = s.chain.CurrentBlockHash().ReverseString()
case "getblock":
var hash util.Uint256
param, err := reqParams.Value(0)
if err != nil {
resultsErr = err
break Methods
}
switch param.Type {
case "string":
hash, err = util.Uint256DecodeReverseString(param.StringVal)
if err != nil {
resultsErr = errInvalidParams
break Methods
}
case "number":
if !s.validBlockHeight(param) {
resultsErr = errInvalidParams
break Methods
}
hash = s.chain.GetHeaderHash(param.IntVal)
case "default":
resultsErr = errInvalidParams
break Methods
}
block, err := s.chain.GetBlock(hash)
if err != nil {
resultsErr = NewInternalServerError(fmt.Sprintf("Problem locating block with hash: %s", hash), err)
break
}
results = wrappers.NewBlock(block, s.chain)
case "getblockcount":
results = s.chain.BlockHeight()
case "getblockhash":
param, err := reqParams.ValueWithType(0, "number")
if err != nil {
resultsErr = err
break Methods
} else if !s.validBlockHeight(param) {
resultsErr = invalidBlockHeightError(0, param.IntVal)
break Methods
}
results = s.chain.GetHeaderHash(param.IntVal)
case "getconnectioncount":
results = s.coreServer.PeerCount()
case "getversion":
results = result.Version{
Port: s.coreServer.ListenTCP,
Nonce: s.coreServer.ID(),
UserAgent: s.coreServer.UserAgent,
}
case "getpeers":
peers := result.NewPeers()
for _, addr := range s.coreServer.UnconnectedPeers() {
peers.AddPeer("unconnected", addr)
}
for _, addr := range s.coreServer.BadPeers() {
peers.AddPeer("bad", addr)
}
for addr := range s.coreServer.Peers() {
peers.AddPeer("connected", addr.NetAddr().String())
}
results = peers
case "getblocksysfee", "getcontractstate", "getrawmempool", "getstorage", "submitblock", "gettxout", "invoke", "invokefunction", "invokescript":
results = "TODO"
case "validateaddress":
param, err := reqParams.Value(0)
if err != nil {
resultsErr = err
break Methods
}
results = wrappers.ValidateAddress(param.RawValue)
case "getassetstate":
param, err := reqParams.ValueWithType(0, "string")
if err != nil {
resultsErr = err
break Methods
}
paramAssetID, err := util.Uint256DecodeReverseString(param.StringVal)
if err != nil {
resultsErr = errInvalidParams
break
}
as := s.chain.GetAssetState(paramAssetID)
if as != nil {
results = wrappers.NewAssetState(as)
} else {
results = "Invalid assetid"
}
case "getaccountstate":
param, err := reqParams.ValueWithType(0, "string")
if err != nil {
resultsErr = err
} else if scriptHash, err := crypto.Uint160DecodeAddress(param.StringVal); err != nil {
resultsErr = errInvalidParams
} else if as := s.chain.GetAccountState(scriptHash); as != nil {
results = wrappers.NewAccountState(as)
} else {
results = "Invalid public account address"
}
case "getrawtransaction":
results, resultsErr = s.getrawtransaction(reqParams)
case "sendrawtransaction":
results, resultsErr = s.sendrawtransaction(reqParams)
default:
resultsErr = NewMethodNotFoundError(fmt.Sprintf("Method '%s' not supported", req.Method), nil)
}
if resultsErr != nil {
req.WriteErrorResponse(w, resultsErr)
return
}
req.WriteResponse(w, results)
}
func (s *Server) getrawtransaction(reqParams Params) (interface{}, error) {
var resultsErr error
var results interface{}
param0, err := reqParams.ValueWithType(0, "string")
if err != nil {
resultsErr = err
} else if txHash, err := util.Uint256DecodeReverseString(param0.StringVal); err != nil {
resultsErr = errInvalidParams
} else if tx, height, err := s.chain.GetTransaction(txHash); err != nil {
err = errors.Wrapf(err, "Invalid transaction hash: %s", txHash)
resultsErr = NewInvalidParamsError(err.Error(), err)
} else if len(reqParams) >= 2 {
_header := s.chain.GetHeaderHash(int(height))
header, err := s.chain.GetHeader(_header)
if err != nil {
resultsErr = NewInvalidParamsError(err.Error(), err)
}
param1, _ := reqParams.ValueAt(1)
switch v := param1.RawValue.(type) {
case int, float64, bool, string:
if v == 0 || v == "0" || v == 0.0 || v == false || v == "false" {
results = hex.EncodeToString(tx.Bytes())
} else {
results = wrappers.NewTransactionOutputRaw(tx, header, s.chain)
}
default:
results = wrappers.NewTransactionOutputRaw(tx, header, s.chain)
}
} else {
results = hex.EncodeToString(tx.Bytes())
}
return results, resultsErr
}
func (s *Server) sendrawtransaction(reqParams Params) (interface{}, error) {
var resultsErr error
var results interface{}
param, err := reqParams.ValueWithType(0, "string")
if err != nil {
resultsErr = err
} else if byteTx, err := hex.DecodeString(param.StringVal); err != nil {
resultsErr = errInvalidParams
} else {
r := io.NewBinReaderFromBuf(byteTx)
tx := &transaction.Transaction{}
tx.DecodeBinary(r)
if r.Err != nil {
err = errors.Wrap(r.Err, "transaction DecodeBinary failed")
} else {
relayReason := s.coreServer.RelayTxn(tx)
switch relayReason {
case network.RelaySucceed:
results = true
case network.RelayAlreadyExists:
err = errors.New("block or transaction already exists and cannot be sent repeatedly")
case network.RelayOutOfMemory:
err = errors.New("the memory pool is full and no more transactions can be sent")
case network.RelayUnableToVerify:
err = errors.New("the block cannot be validated")
case network.RelayInvalid:
err = errors.New("block or transaction validation failed")
case network.RelayPolicyFail:
err = errors.New("one of the Policy filters failed")
default:
err = errors.New("unknown error")
}
}
if err != nil {
resultsErr = NewInternalServerError(err.Error(), err)
}
}
return results, resultsErr
}
func (s Server) validBlockHeight(param *Param) bool {
return param.IntVal >= 0 && param.IntVal <= int(s.chain.BlockHeight())
}