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rpcserver.go
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rpcserver.go
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// Copyright (c) 2013-2016 The btcsuite developers
// Copyright (c) 2015-2017 The Decred developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package main
import (
"bytes"
"crypto/elliptic"
"crypto/sha256"
"crypto/subtle"
"crypto/tls"
"encoding/base64"
"encoding/binary"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"math"
"math/big"
"math/rand"
"net"
"net/http"
"os"
"sort"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/btcsuite/websocket"
"github.com/decred/bitset"
"github.com/decred/dcrd/blockchain"
"github.com/decred/dcrd/blockchain/stake"
"github.com/decred/dcrd/chaincfg"
"github.com/decred/dcrd/chaincfg/chainec"
"github.com/decred/dcrd/chaincfg/chainhash"
"github.com/decred/dcrd/database"
"github.com/decred/dcrd/dcrjson"
"github.com/decred/dcrd/mempool"
"github.com/decred/dcrd/mining"
"github.com/decred/dcrd/txscript"
"github.com/decred/dcrd/wire"
"github.com/decred/dcrutil"
)
// API version constants
const (
jsonrpcSemverString = "2.0.0"
jsonrpcSemverMajor = 2
jsonrpcSemverMinor = 0
jsonrpcSemverPatch = 0
)
const (
// rpcAuthTimeoutSeconds is the number of seconds a connection to the
// RPC server is allowed to stay open without authenticating before it
// is closed.
rpcAuthTimeoutSeconds = 10
// uint256Size is the number of bytes needed to represent an unsigned
// 256-bit integer.
uint256Size = 32
// getworkDataLen is the length of the data field of the getwork RPC.
// It consists of the serialized block header plus the internal blake256
// padding. The internal blake256 padding consists of a single 1 bit
// followed by zeros and a final 1 bit in order to pad the message out
// to 56 bytes followed by length of the message in bits encoded as a
// big-endian uint64 (8 bytes). Thus, the resulting length is a
// multiple of the blake256 block size (64 bytes). Given the padding
// requires at least a 1 bit and 64 bits for the padding, the following
// converts the block header length and hash block size to bits in order
// to ensure the correct number of hash blocks are calculated and then
// multiplies the result by the block hash block size in bytes.
getworkDataLen = (1 + ((wire.MaxBlockHeaderPayload*8 + 65) /
(chainhash.HashBlockSize * 8))) * chainhash.HashBlockSize
// getworkExpirationDiff is the number of blocks below the current
// best block in height to begin pruning out old block work from
// the template pool.
getworkExpirationDiff = 3
// gbtNonceRange is two 32-bit big-endian hexadecimal integers which
// represent the valid ranges of nonces returned by the getblocktemplate
// RPC.
gbtNonceRange = "00000000ffffffff"
// gbtRegenerateSeconds is the number of seconds that must pass before
// a new template is generated when the previous block hash has not
// changed and there have been changes to the available transactions
// in the memory pool.
gbtRegenerateSeconds = 60
// merkleRootPairSize
merkleRootPairSize = 64
// sstxCommitmentString is the string to insert when a verbose
// transaction output's pkscript type is a ticket commitment.
sstxCommitmentString = "sstxcommitment"
// maxProtocolVersion is the max protocol version the server supports.
maxProtocolVersion = 2
// maxSigOpsPerTx is the maximum number of signature operations
// in a single transaction we will relay or mine. It is a fraction
// of the max signature operations for a block.
//
// NOTE: This is being added while syncing upstream because the code in
// the RPC server here is referencing the variable even though it most
// definitely shouldn't be. It is a policy limit regarding what should
// be relayed or mined and thus should only apply in the mempool and/or
// possibly the mining code.
maxSigOpsPerTx = blockchain.MaxSigOpsPerBlock / 5
)
var (
// blake256Pad is the extra blake256 internal padding needed for the
// data of the getwork RPC. It is set in the init routine since it is
// based on the size of the block header and requires a bit of
// calculation.
blake256Pad []byte
// gbtMutableFields are the manipulations the server allows to be made
// to block templates generated by the getblocktemplate RPC. It is
// declared here to avoid the overhead of creating the slice on every
// invocation for constant data.
gbtMutableFields = []string{
"time", "transactions/add", "prevblock", "coinbase/append",
}
// gbtCoinbaseAux describes additional data that miners should include
// in the coinbase signature script. It is declared here to avoid the
// overhead of creating a new object on every invocation for constant
// data.
gbtCoinbaseAux = &dcrjson.GetBlockTemplateResultAux{
Flags: hex.EncodeToString(builderScript(txscript.
NewScriptBuilder().AddData([]byte(coinbaseFlags)))),
}
// gbtCapabilities describes additional capabilities returned with a
// block template generated by the getblocktemplate RPC. It is
// declared here to avoid the overhead of creating the slice on every
// invocation for constant data.
gbtCapabilities = []string{"proposal"}
)
// Errors
var (
// ErrRPCUnimplemented is an error returned to RPC clients when the
// provided command is recognized, but not implemented.
ErrRPCUnimplemented = &dcrjson.RPCError{
Code: dcrjson.ErrRPCUnimplemented,
Message: "Command unimplemented",
}
// ErrRPCNoWallet is an error returned to RPC clients when the provided
// command is recognized as a wallet command.
ErrRPCNoWallet = &dcrjson.RPCError{
Code: dcrjson.ErrRPCNoWallet,
Message: "This implementation does not implement wallet commands",
}
)
type commandHandler func(*rpcServer, interface{}, <-chan struct{}) (interface{}, error)
// rpcHandlers maps RPC command strings to appropriate handler functions.
// This is set by init because help references rpcHandlers and thus causes
// a dependency loop.
var rpcHandlers map[string]commandHandler
var rpcHandlersBeforeInit = map[string]commandHandler{
"addnode": handleAddNode,
"createrawsstx": handleCreateRawSStx,
"createrawssgentx": handleCreateRawSSGenTx,
"createrawssrtx": handleCreateRawSSRtx,
"createrawtransaction": handleCreateRawTransaction,
"debuglevel": handleDebugLevel,
"decoderawtransaction": handleDecodeRawTransaction,
"decodescript": handleDecodeScript,
"estimatefee": handleEstimateFee,
"estimatestakediff": handleEstimateStakeDiff,
"existsaddress": handleExistsAddress,
"existsaddresses": handleExistsAddresses,
"existsexpiredtickets": handleExistsExpiredTickets,
"existsliveticket": handleExistsLiveTicket,
"existslivetickets": handleExistsLiveTickets,
"existsmempooltxs": handleExistsMempoolTxs,
"generate": handleGenerate,
"getaddednodeinfo": handleGetAddedNodeInfo,
"getbestblock": handleGetBestBlock,
"getbestblockhash": handleGetBestBlockHash,
"getblock": handleGetBlock,
"getblockcount": handleGetBlockCount,
"getblockhash": handleGetBlockHash,
"getblockheader": handleGetBlockHeader,
"getblocktemplate": handleGetBlockTemplate,
"getcoinsupply": handleGetCoinSupply,
"getconnectioncount": handleGetConnectionCount,
"getcurrentnet": handleGetCurrentNet,
"getdifficulty": handleGetDifficulty,
"getgenerate": handleGetGenerate,
"gethashespersec": handleGetHashesPerSec,
"getheaders": handleGetHeaders,
"getinfo": handleGetInfo,
"getmempoolinfo": handleGetMempoolInfo,
"getmininginfo": handleGetMiningInfo,
"getnettotals": handleGetNetTotals,
"getnetworkhashps": handleGetNetworkHashPS,
"getpeerinfo": handleGetPeerInfo,
"getrawmempool": handleGetRawMempool,
"getrawtransaction": handleGetRawTransaction,
"getstakedifficulty": handleGetStakeDifficulty,
"getstakeversions": handleGetStakeVersions,
"getticketpoolvalue": handleGetTicketPoolValue,
"getvoteinfo": handleGetVoteInfo,
"gettxout": handleGetTxOut,
"getwork": handleGetWork,
"help": handleHelp,
"livetickets": handleLiveTickets,
"missedtickets": handleMissedTickets,
"node": handleNode,
"ping": handlePing,
"searchrawtransactions": handleSearchRawTransactions,
"rebroadcastmissed": handleRebroadcastMissed,
"rebroadcastwinners": handleRebroadcastWinners,
"sendrawtransaction": handleSendRawTransaction,
"setgenerate": handleSetGenerate,
"stop": handleStop,
"submitblock": handleSubmitBlock,
"ticketfeeinfo": handleTicketFeeInfo,
"ticketsforaddress": handleTicketsForAddress,
"ticketvwap": handleTicketVWAP,
"txfeeinfo": handleTxFeeInfo,
"validateaddress": handleValidateAddress,
"verifychain": handleVerifyChain,
"verifymessage": handleVerifyMessage,
"version": handleVersion,
}
// list of commands that we recognize, but for which dcrd has no support because
// it lacks support for wallet functionality. For these commands the user
// should ask a connected instance of dcrwallet.
var rpcAskWallet = map[string]struct{}{
"accountaddressindex": {},
"accountfetchaddresses": {},
"accountsyncaddressindex": {},
"addmultisigaddress": {},
"addticket": {},
"backupwallet": {},
"createencryptedwallet": {},
"createmultisig": {},
"dumpprivkey": {},
"dumpwallet": {},
"encryptwallet": {},
"getaccount": {},
"getaccountaddress": {},
"getaddressesbyaccount": {},
"getbalance": {},
"getnewaddress": {},
"getrawchangeaddress": {},
"getreceivedbyaccount": {},
"getreceivedbyaddress": {},
"getstakeinfo": {},
"getticketvotebits": {},
"getticketsvotebits": {},
"gettransaction": {},
"gettxoutsetinfo": {},
"getunconfirmedbalance": {},
"getwalletinfo": {},
"importprivkey": {},
"importwallet": {},
"keypoolrefill": {},
"listaccounts": {},
"listaddressgroupings": {},
"listlockunspent": {},
"listreceivedbyaccount": {},
"listreceivedbyaddress": {},
"listsinceblock": {},
"listtransactions": {},
"listunspent": {},
"lockunspent": {},
"move": {},
"rescanwallet": {},
"sendfrom": {},
"sendmany": {},
"sendtoaddress": {},
"setaccount": {},
"setticketvotebits": {},
"settxfee": {},
"signmessage": {},
"signrawtransaction": {},
"stakepooluserinfo": {},
"walletinfo": {},
"walletlock": {},
"walletpassphrase": {},
"walletpassphrasechange": {},
}
// Commands that are currently unimplemented, but should ultimately be.
var rpcUnimplemented = map[string]struct{}{
"estimatefee": {},
"estimatepriority": {},
"getblockchaininfo": {},
"getchaintips": {},
"getnetworkinfo": {},
}
// Commands that are available to a limited user
var rpcLimited = map[string]struct{}{
// Websockets commands
"notifyblocks": {},
"notifynewtransactions": {},
"notifyreceived": {},
"notifyspent": {},
"rescan": {},
"session": {},
// Websockets AND HTTP/S commands
"help": {},
// HTTP/S-only commands
"createrawtransaction": {},
"decoderawtransaction": {},
"decodescript": {},
"getbestblock": {},
"getbestblockhash": {},
"getblock": {},
"getblockcount": {},
"getblockhash": {},
"getcurrentnet": {},
"getdifficulty": {},
"getinfo": {},
"getnettotals": {},
"getnetworkhashps": {},
"getrawmempool": {},
"getrawtransaction": {},
"gettxout": {},
"searchrawtransactions": {},
"sendrawtransaction": {},
"submitblock": {},
"validateaddress": {},
"verifymessage": {},
"version": {},
}
// builderScript is a convenience function which is used for hard-coded scripts
// built with the script builder. Any errors are converted to a panic since it
// is only, and must only, be used with hard-coded, and therefore, known good,
// scripts.
func builderScript(builder *txscript.ScriptBuilder) []byte {
script, err := builder.Script()
if err != nil {
panic(err)
}
return script
}
// internalRPCError is a convenience function to convert an internal error to
// an RPC error with the appropriate code set. It also logs the error to the
// RPC server subsystem since internal errors really should not occur. The
// context parameter is only used in the log message and may be empty if it's
// not needed.
func internalRPCError(errStr, context string) *dcrjson.RPCError {
logStr := errStr
if context != "" {
logStr = context + ": " + errStr
}
rpcsLog.Error(logStr)
return dcrjson.NewRPCError(dcrjson.ErrRPCInternal.Code, errStr)
}
// rpcDecodeHexError is a convenience function for returning a nicely formatted
// RPC error which indicates the provided hex string failed to decode.
func rpcDecodeHexError(gotHex string) *dcrjson.RPCError {
return dcrjson.NewRPCError(dcrjson.ErrRPCDecodeHexString,
fmt.Sprintf("Argument must be hexadecimal string (not %q)",
gotHex))
}
// rpcNoTxInfoError is a convenience function for returning a nicely formatted
// RPC error which indiactes there is no information available for the provided
// transaction hash.
func rpcNoTxInfoError(txHash *chainhash.Hash) *dcrjson.RPCError {
return dcrjson.NewRPCError(dcrjson.ErrRPCNoTxInfo,
fmt.Sprintf("No information available about transaction %v",
txHash))
}
// workStateBlockInfo houses information about how to reconstruct a block given
// its template and signature script.
type workStateBlockInfo struct {
msgBlock *wire.MsgBlock
pkScript []byte
}
// workState houses state that is used in between multiple RPC invocations to
// getwork.
type workState struct {
sync.Mutex
lastTxUpdate time.Time
lastGenerated time.Time
prevHash *chainhash.Hash
msgBlock *wire.MsgBlock
extraNonce uint64
}
// newWorkState returns a new instance of a workState with all internal fields
// initialized and ready to use.
func newWorkState() *workState {
return &workState{}
}
// gbtWorkState houses state that is used in between multiple RPC invocations to
// getblocktemplate.
type gbtWorkState struct {
sync.Mutex
lastTxUpdate time.Time
lastGenerated time.Time
prevHash *chainhash.Hash
minTimestamp time.Time
template *BlockTemplate
notifyMap map[chainhash.Hash]map[int64]chan struct{}
timeSource blockchain.MedianTimeSource
}
// newGbtWorkState returns a new instance of a gbtWorkState with all internal
// fields initialized and ready to use.
func newGbtWorkState(timeSource blockchain.MedianTimeSource) *gbtWorkState {
return &gbtWorkState{
notifyMap: make(map[chainhash.Hash]map[int64]chan struct{}),
timeSource: timeSource,
}
}
// handleUnimplemented is the handler for commands that should ultimately be
// supported but are not yet implemented.
func handleUnimplemented(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) {
return nil, ErrRPCUnimplemented
}
// handleAskWallet is the handler for commands that are recognized as valid, but
// are unable to answer correctly since it involves wallet state.
// These commands will be implemented in dcrwallet.
func handleAskWallet(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) {
return nil, ErrRPCNoWallet
}
// handleAddNode handles addnode commands.
func handleAddNode(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) {
c := cmd.(*dcrjson.AddNodeCmd)
addr := normalizeAddress(c.Addr, activeNetParams.DefaultPort)
var err error
switch c.SubCmd {
case "add":
err = s.server.ConnectNode(addr, true)
case "remove":
err = s.server.RemoveNodeByAddr(addr)
case "onetry":
err = s.server.ConnectNode(addr, false)
default:
return nil, &dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidParameter,
Message: "invalid subcommand for addnode",
}
}
if err != nil {
return nil, &dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidParameter,
Message: err.Error(),
}
}
// no data returned unless an error.
return nil, nil
}
// handleNode handles node commands.
func handleNode(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) {
c := cmd.(*dcrjson.NodeCmd)
var addr string
var nodeID uint64
var errN, err error
switch c.SubCmd {
case "disconnect":
// If we have a valid uint disconnect by node id. Otherwise,
// attempt to disconnect by address, returning an error if a
// valid IP address is not supplied.
if nodeID, errN = strconv.ParseUint(c.Target, 10, 32); errN == nil {
err = s.server.DisconnectNodeByID(int32(nodeID))
} else {
if _, _, errP := net.SplitHostPort(c.Target); errP == nil || net.ParseIP(c.Target) != nil {
addr = normalizeAddress(c.Target, activeNetParams.DefaultPort)
err = s.server.DisconnectNodeByAddr(addr)
} else {
return nil, &dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidParameter,
Message: "invalid address or node ID",
}
}
}
if err != nil && peerExists(s.server.Peers(), addr, int32(nodeID)) {
return nil, &dcrjson.RPCError{
Code: dcrjson.ErrRPCMisc,
Message: "can't disconnect a permanent peer, use remove",
}
}
case "remove":
// If we have a valid uint disconnect by node id. Otherwise,
// attempt to disconnect by address, returning an error if a
// valid IP address is not supplied.
if nodeID, errN = strconv.ParseUint(c.Target, 10, 32); errN == nil {
err = s.server.RemoveNodeByID(int32(nodeID))
} else {
if _, _, errP := net.SplitHostPort(c.Target); errP == nil || net.ParseIP(c.Target) != nil {
addr = normalizeAddress(c.Target, activeNetParams.DefaultPort)
err = s.server.RemoveNodeByAddr(addr)
} else {
return nil, &dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidParameter,
Message: "invalid address or node ID",
}
}
}
if err != nil && peerExists(s.server.Peers(), addr, int32(nodeID)) {
return nil, &dcrjson.RPCError{
Code: dcrjson.ErrRPCMisc,
Message: "can't remove a temporary peer, use disconnect",
}
}
case "connect":
addr = normalizeAddress(c.Target, activeNetParams.DefaultPort)
// Default to temporary connections.
subCmd := "temp"
if c.ConnectSubCmd != nil {
subCmd = *c.ConnectSubCmd
}
switch subCmd {
case "perm", "temp":
err = s.server.ConnectNode(addr, subCmd == "perm")
default:
return nil, &dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidParameter,
Message: "invalid subcommand for node connect",
}
}
default:
return nil, &dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidParameter,
Message: "invalid subcommand for node",
}
}
if err != nil {
return nil, &dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidParameter,
Message: err.Error(),
}
}
// no data returned unless an error.
return nil, nil
}
// peerExists determines if a certain peer is currently connected given
// information about all currently connected peers. Peer existence is
// determined using either a target address or node id.
func peerExists(peers []*serverPeer, addr string, nodeID int32) bool {
for _, p := range peers {
if p.ID() == nodeID || p.Addr() == addr {
return true
}
}
return false
}
// messageToHex serializes a message to the wire protocol encoding using the
// latest protocol version and returns a hex-encoded string of the result.
func messageToHex(msg wire.Message) (string, error) {
var buf bytes.Buffer
if err := msg.BtcEncode(&buf, maxProtocolVersion); err != nil {
context := fmt.Sprintf("Failed to encode msg of type %T", msg)
return "", internalRPCError(err.Error(), context)
}
return hex.EncodeToString(buf.Bytes()), nil
}
// handleCreateRawTransaction handles createrawtransaction commands.
func handleCreateRawTransaction(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) {
c := cmd.(*dcrjson.CreateRawTransactionCmd)
// Validate the locktime, if given.
if c.LockTime != nil &&
(*c.LockTime < 0 || *c.LockTime > int64(wire.MaxTxInSequenceNum)) {
return nil, &dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidParameter,
Message: "Locktime out of range",
}
}
// Add all transaction inputs to a new transaction after performing
// some validity checks.
mtx := wire.NewMsgTx()
for _, input := range c.Inputs {
txHash, err := chainhash.NewHashFromStr(input.Txid)
if err != nil {
return nil, rpcDecodeHexError(input.Txid)
}
if !(int8(input.Tree) == wire.TxTreeRegular ||
int8(input.Tree) == wire.TxTreeStake) {
return nil, dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidParams.Code,
Message: "Invalid parameter, tx tree must be regular or stake",
}
}
prevOut := wire.NewOutPoint(txHash, uint32(input.Vout), int8(input.Tree))
txIn := wire.NewTxIn(prevOut, []byte{})
if c.LockTime != nil && *c.LockTime != 0 {
txIn.Sequence = wire.MaxTxInSequenceNum - 1
}
mtx.AddTxIn(txIn)
}
// Add all transaction outputs to the transaction after performing
// some validity checks.
for encodedAddr, amount := range c.Amounts {
// Ensure amount is in the valid range for monetary amounts.
if amount <= 0 || amount > dcrutil.MaxAmount {
return nil, dcrjson.RPCError{
Code: dcrjson.ErrRPCType,
Message: "Invalid amount",
}
}
// Decode the provided address.
addr, err := dcrutil.DecodeAddress(encodedAddr,
activeNetParams.Params)
if err != nil {
return nil, dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidAddressOrKey,
Message: "Invalid address or key: " + err.Error(),
}
}
// Ensure the address is one of the supported types and that
// the network encoded with the address matches the network the
// server is currently on.
switch addr.(type) {
case *dcrutil.AddressPubKeyHash:
case *dcrutil.AddressScriptHash:
default:
return nil, &dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidAddressOrKey,
Message: "Invalid address or key",
}
}
if !addr.IsForNet(s.server.chainParams) {
return nil, dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidAddressOrKey,
Message: "Invalid address: " + encodedAddr +
" is for the wrong network",
}
}
// Create a new script which pays to the provided address.
pkScript, err := txscript.PayToAddrScript(addr)
if err != nil {
return nil, dcrjson.RPCError{
Code: dcrjson.ErrRPCInternal.Code,
Message: err.Error(),
}
}
atomic, err := dcrutil.NewAmount(amount)
if err != nil {
return nil, dcrjson.RPCError{
Code: dcrjson.ErrRPCInternal.Code,
Message: err.Error(),
}
}
txOut := wire.NewTxOut(int64(atomic), pkScript)
mtx.AddTxOut(txOut)
}
// Set the Locktime, if given.
if c.LockTime != nil {
mtx.LockTime = uint32(*c.LockTime)
}
// Return the serialized and hex-encoded transaction. Note that this
// is intentionally not directly returning because the first return
// value is a string and it would result in returning an empty string to
// the client instead of nothing (nil) in the case of an error.
mtxHex, err := messageToHex(mtx)
if err != nil {
return nil, err
}
return mtxHex, nil
}
// handleCreateRawSStx handles createrawsstx commands.
func handleCreateRawSStx(s *rpcServer,
cmd interface{},
closeChan <-chan struct{}) (interface{}, error) {
c := cmd.(*dcrjson.CreateRawSStxCmd)
// Basic sanity checks for the information coming from the cmd.
if len(c.Inputs) != len(c.COuts) {
errStr := fmt.Sprintf("Number of inputs should be equal to "+
"the number of future commitment/change outs for any sstx;"+
" %v inputs given, but %v COuts", len(c.Inputs),
len(c.COuts))
return nil, errors.New(errStr)
}
if len(c.Amount) != 1 {
errStr := fmt.Sprintf("Only one SSGen tagged output is allowed "+
"per sstx; len ssgenout %v", len(c.Amount))
return nil, errors.New(errStr)
}
// Add all transaction inputs to a new transaction after performing
// some validity checks.
mtx := wire.NewMsgTx()
for _, input := range c.Inputs {
txHash, err := chainhash.NewHashFromStr(input.Txid)
if err != nil {
return nil, rpcDecodeHexError(input.Txid)
}
if input.Vout < 0 {
return nil, dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidParameter,
Message: "Invalid parameter, vout must be positive",
}
}
if !(int8(input.Tree) == wire.TxTreeRegular ||
int8(input.Tree) == wire.TxTreeStake) {
return nil, dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidParameter,
Message: "Invalid parameter, tx tree must be regular or stake",
}
}
prevOut := wire.NewOutPoint(txHash, uint32(input.Vout), int8(input.Tree))
txIn := wire.NewTxIn(prevOut, []byte{})
mtx.AddTxIn(txIn)
}
// Add all transaction outputs to the transaction after performing
// some validity checks.
amtTicket := int64(0)
for encodedAddr, amount := range c.Amount {
// Ensure amount is in the valid range for monetary amounts.
if amount <= 0 || amount > dcrutil.MaxAmount {
errStr := fmt.Sprintf("Invalid sstx commitment amount %v", amount)
return nil, dcrjson.RPCError{
Code: dcrjson.ErrRPCType,
Message: errStr,
}
}
// Decode the provided address.
addr, err := dcrutil.DecodeAddress(encodedAddr,
activeNetParams.Params)
if err != nil {
return nil, dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidAddressOrKey,
Message: "Invalid address or key: " + err.Error(),
}
}
// Ensure the address is one of the supported types and that
// the network encoded with the address matches the network the
// server is currently on.
switch addr.(type) {
case *dcrutil.AddressPubKeyHash:
default:
return nil, &dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidAddressOrKey,
Message: "Invalid address or key",
}
}
if !addr.IsForNet(s.server.chainParams) {
return nil, dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidAddressOrKey,
Message: "Invalid address: " + encodedAddr +
" is for the wrong network",
}
}
// Create a new script which pays to the provided address with an
// SStx tagged output.
pkScript, err := txscript.PayToSStx(addr)
if err != nil {
return nil, dcrjson.RPCError{
Code: dcrjson.ErrRPCInternal.Code,
Message: err.Error(),
}
}
txOut := wire.NewTxOut(amount, pkScript)
mtx.AddTxOut(txOut)
amtTicket += amount
}
// Calculated the commitment amounts, then create the
// addresses and payout proportions as null data
// outputs.
inputAmts := make([]int64, len(c.Inputs))
for i, input := range c.Inputs {
inputAmts[i] = input.Amt
}
changeAmts := make([]int64, len(c.COuts))
for i, cout := range c.COuts {
changeAmts[i] = cout.ChangeAmt
}
// Check and make sure none of the change overflows
// the input amounts.
for i, amt := range inputAmts {
if changeAmts[i] >= amt {
errStr := fmt.Sprintf("Invalid sstx change amount %v; "+
"should have been less than input amt of %v",
changeAmts[i], amt)
return nil, dcrjson.RPCError{
Code: dcrjson.ErrRPCType,
Message: errStr,
}
}
}
// Obtain the commitment amounts.
_, amountsCommitted, err := stake.SStxNullOutputAmounts(inputAmts,
changeAmts, amtTicket)
if err != nil {
return nil, err
}
for i, cout := range c.COuts {
// 1. Append future commitment output.
addr, err := dcrutil.DecodeAddress(cout.Addr,
activeNetParams.Params)
if err != nil {
return nil, fmt.Errorf("cannot decode address: %s", err)
}
// Ensure the address is one of the supported types and that
// the network encoded with the address matches the network the
// server is currently on.
switch addr.(type) {
case *dcrutil.AddressPubKeyHash:
break
case *dcrutil.AddressScriptHash:
break
default:
return nil, &dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidAddressOrKey,
Message: "Invalid address or key",
}
}
if !addr.IsForNet(s.server.chainParams) {
return nil, dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidAddressOrKey,
Message: "Invalid address: " +
" is for the wrong network",
}
}
// Create an OP_RETURN push containing the pubkeyhash to send rewards to.
// TODO Replace 0x0000 fee limits with an argument passed to the RPC call.
pkScript, err := txscript.GenerateSStxAddrPush(addr,
dcrutil.Amount(amountsCommitted[i]), 0x0000)
if err != nil {
return nil, fmt.Errorf("cannot create txout script: %s", err)
}
txout := wire.NewTxOut(int64(0), pkScript)
mtx.AddTxOut(txout)
// 2. Append change output.
// Ensure amount is in the valid range for monetary amounts.
if cout.ChangeAmt < 0 || cout.ChangeAmt > dcrutil.MaxAmount {
errStr := fmt.Sprintf("Invalid sstx change amount %v",
cout.ChangeAmt)
return nil, dcrjson.RPCError{
Code: dcrjson.ErrRPCType,
Message: errStr,
}
}
// Decode the provided address.
addr, err = dcrutil.DecodeAddress(cout.ChangeAddr,
activeNetParams.Params)
if err != nil {
return nil, dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidAddressOrKey,
Message: "Invalid address: " +
" is for the wrong network",
}
}
// Ensure the address is one of the supported types and that
// the network encoded with the address matches the network the
// server is currently on.
switch addr.(type) {
case *dcrutil.AddressPubKeyHash:
break
case *dcrutil.AddressScriptHash:
break
default:
return nil, &dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidAddressOrKey,
Message: "Invalid address or key",
}
}
if !addr.IsForNet(s.server.chainParams) {
return nil, dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidAddressOrKey,
Message: fmt.Sprintf("%s: %q",
"Wront network",
addr),
}
}
// Create a new script which pays to the provided address with an
// SStx change tagged output.
pkScript, err = txscript.PayToSStxChange(addr)
if err != nil {
return nil, dcrjson.RPCError{
Code: dcrjson.ErrRPCInternal.Code,
Message: err.Error(),
}
}
txOut := wire.NewTxOut(cout.ChangeAmt, pkScript)
mtx.AddTxOut(txOut)
}
// Make sure we generated a valid SStx.
if _, err := stake.IsSStx(mtx); err != nil {
return nil, err
}
// Return the serialized and hex-encoded transaction.
mtxHex, err := messageToHex(mtx)
if err != nil {
return nil, err
}
return mtxHex, nil
}
// handleCreateRawSSGenTx handles createrawssgentx commands.
func handleCreateRawSSGenTx(s *rpcServer,
cmd interface{},
closeChan <-chan struct{}) (interface{}, error) {
c := cmd.(*dcrjson.CreateRawSSGenTxCmd)
// Only a single SStx should be given
if len(c.Inputs) != 1 {
return nil, dcrjson.RPCError{
Code: dcrjson.ErrRPCInvalidParameter,
Message: "Invalid parameter, SSGen tx only have one valid input",
}
}
// 1. Fetch the SStx, then calculate all the values we'll need later for
// the generation of the SSGen tx outputs.
//
// Convert the provided transaction hash hex to a chainhash.Hash.
txHash, err := chainhash.NewHashFromStr(c.Inputs[0].Txid)
if err != nil {
rpcsLog.Errorf("Error generating sha: %v", err)
return nil, dcrjson.RPCError{
Code: dcrjson.ErrRPCBlockNotFound,
Message: "c.Inputs[0].Txid must be a hexadecimal string",
}
}
// Try to fetch the ticket from the block database.
ticketUtx, err := s.chain.FetchUtxoEntry(txHash)
if err != nil {
rpcsLog.Errorf("Error fetching tx: %v", err)
return nil, &dcrjson.RPCError{