// Copyright (c) 2013-2017 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/sha256" "crypto/subtle" "encoding/base64" "encoding/hex" "encoding/json" "errors" "fmt" "io" "io/ioutil" "math/big" "math/rand" "net" "net/http" "os" "strconv" "strings" "sync" "sync/atomic" "time" "github.com/btcsuite/websocket" "github.com/lbryio/lbcd/blockchain" "github.com/lbryio/lbcd/blockchain/indexers" "github.com/lbryio/lbcd/btcec" "github.com/lbryio/lbcd/btcjson" "github.com/lbryio/lbcd/chaincfg" "github.com/lbryio/lbcd/chaincfg/chainhash" "github.com/lbryio/lbcd/database" "github.com/lbryio/lbcd/mempool" "github.com/lbryio/lbcd/mining" "github.com/lbryio/lbcd/mining/cpuminer" "github.com/lbryio/lbcd/peer" "github.com/lbryio/lbcd/txscript" "github.com/lbryio/lbcd/wire" btcutil "github.com/lbryio/lbcutil" ) // API version constants const ( jsonrpcSemverString = "1.3.0" jsonrpcSemverMajor = 1 jsonrpcSemverMinor = 3 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 // 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 // maxProtocolVersion is the max protocol version the server supports. maxProtocolVersion = 70002 ) var ( // 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 = &btcjson.GetBlockTemplateResultAux{ Flags: hex.EncodeToString(builderScript(txscript. NewScriptBuilder(). AddData([]byte(mining.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"} // JSON 2.0 batched request prefix batchedRequestPrefix = []byte("[") ) // Errors var ( // ErrRPCUnimplemented is an error returned to RPC clients when the // provided command is recognized, but not implemented. ErrRPCUnimplemented = &btcjson.RPCError{ Code: btcjson.ErrRPCUnimplemented, Message: "Command unimplemented", } // ErrRPCNoWallet is an error returned to RPC clients when the provided // command is recognized as a wallet command. ErrRPCNoWallet = &btcjson.RPCError{ Code: btcjson.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, "createrawtransaction": handleCreateRawTransaction, "debuglevel": handleDebugLevel, "decoderawtransaction": handleDecodeRawTransaction, "decodescript": handleDecodeScript, "estimatefee": handleEstimateFee, "generate": handleGenerate, "generatetoaddress": handleGenerateToAddress, "getaddednodeinfo": handleGetAddedNodeInfo, "getbestblock": handleGetBestBlock, "getbestblockhash": handleGetBestBlockHash, "getblock": handleGetBlock, "getblockchaininfo": handleGetBlockChainInfo, "getblockcount": handleGetBlockCount, "getblockhash": handleGetBlockHash, "getblockheader": handleGetBlockHeader, "getblocktemplate": handleGetBlockTemplate, "getcfilter": handleGetCFilter, "getcfilterheader": handleGetCFilterHeader, "getconnectioncount": handleGetConnectionCount, "getcurrentnet": handleGetCurrentNet, "getdifficulty": handleGetDifficulty, "getgenerate": handleGetGenerate, "gethashespersec": handleGetHashesPerSec, "getheaders": handleGetHeaders, "getinfo": handleGetInfo, "getmempoolinfo": handleGetMempoolInfo, "getmininginfo": handleGetMiningInfo, "getnettotals": handleGetNetTotals, "getnetworkhashps": handleGetNetworkHashPS, "getnodeaddresses": handleGetNodeAddresses, "getpeerinfo": handleGetPeerInfo, "getrawmempool": handleGetRawMempool, "getrawtransaction": handleGetRawTransaction, "gettxout": handleGetTxOut, "help": handleHelp, "node": handleNode, "ping": handlePing, "searchrawtransactions": handleSearchRawTransactions, "sendrawtransaction": handleSendRawTransaction, "setgenerate": handleSetGenerate, "signmessagewithprivkey": handleSignMessageWithPrivKey, "stop": handleStop, "submitblock": handleSubmitBlock, "uptime": handleUptime, "validateaddress": handleValidateAddress, "verifychain": handleVerifyChain, "verifymessage": handleVerifyMessage, "version": handleVersion, } // list of commands that we recognize, but for which btcd has no support because // it lacks support for wallet functionality. For these commands the user // should ask a connected instance of btcwallet. var rpcAskWallet = map[string]struct{}{ "addmultisigaddress": {}, "backupwallet": {}, "createencryptedwallet": {}, "createmultisig": {}, "dumpprivkey": {}, "dumpwallet": {}, "encryptwallet": {}, "getaccount": {}, "getaccountaddress": {}, "getaddressesbyaccount": {}, "getbalance": {}, "getnewaddress": {}, "getrawchangeaddress": {}, "getreceivedbyaccount": {}, "getreceivedbyaddress": {}, "gettransaction": {}, "gettxoutsetinfo": {}, "getunconfirmedbalance": {}, "getwalletinfo": {}, "importprivkey": {}, "importwallet": {}, "keypoolrefill": {}, "listaccounts": {}, "listaddressgroupings": {}, "listlockunspent": {}, "listreceivedbyaccount": {}, "listreceivedbyaddress": {}, "listsinceblock": {}, "listtransactions": {}, "listunspent": {}, "lockunspent": {}, "move": {}, "sendfrom": {}, "sendmany": {}, "sendtoaddress": {}, "setaccount": {}, "settxfee": {}, "signmessage": {}, "signrawtransaction": {}, "walletlock": {}, "walletpassphrase": {}, "walletpassphrasechange": {}, } // Commands that are currently unimplemented, but should ultimately be. var rpcUnimplemented = map[string]struct{}{ "estimatepriority": {}, "getchaintips": {}, "getmempoolentry": {}, "getnetworkinfo": {}, "getwork": {}, "invalidateblock": {}, "preciousblock": {}, "reconsiderblock": {}, } // Commands that are available to a limited user var rpcLimited = map[string]struct{}{ // Websockets commands "loadtxfilter": {}, "notifyblocks": {}, "notifynewtransactions": {}, "notifyreceived": {}, "notifyspent": {}, "rescan": {}, "rescanblocks": {}, "session": {}, // Websockets AND HTTP/S commands "help": {}, // HTTP/S-only commands "createrawtransaction": {}, "decoderawtransaction": {}, "decodescript": {}, "estimatefee": {}, "getbestblock": {}, "getbestblockhash": {}, "getblock": {}, "getblockcount": {}, "getblockhash": {}, "getblockheader": {}, "getcfilter": {}, "getcfilterheader": {}, "getcurrentnet": {}, "getdifficulty": {}, "getheaders": {}, "getinfo": {}, "getnettotals": {}, "getnetworkhashps": {}, "getrawmempool": {}, "getrawtransaction": {}, "gettxout": {}, "searchrawtransactions": {}, "sendrawtransaction": {}, "submitblock": {}, "uptime": {}, "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) *btcjson.RPCError { logStr := errStr if context != "" { logStr = context + ": " + errStr } rpcsLog.Error(logStr) return btcjson.NewRPCError(btcjson.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) *btcjson.RPCError { return btcjson.NewRPCError(btcjson.ErrRPCDecodeHexString, fmt.Sprintf("Argument must be hexadecimal string (not %q)", gotHex)) } // rpcNoTxInfoError is a convenience function for returning a nicely formatted // RPC error which indicates there is no information available for the provided // transaction hash. func rpcNoTxInfoError(txHash *chainhash.Hash) *btcjson.RPCError { return btcjson.NewRPCError(btcjson.ErrRPCNoTxInfo, fmt.Sprintf("No information available about transaction %v", txHash)) } // 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 *mining.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 btcwallet. 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.(*btcjson.AddNodeCmd) addr := normalizeAddress(c.Addr, s.cfg.ChainParams.DefaultPort) var err error switch c.SubCmd { case "add": err = s.cfg.ConnMgr.Connect(addr, true) case "remove": err = s.cfg.ConnMgr.RemoveByAddr(addr) case "onetry": err = s.cfg.ConnMgr.Connect(addr, false) default: return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidParameter, Message: "invalid subcommand for addnode", } } if err != nil { return nil, &btcjson.RPCError{ Code: btcjson.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.(*btcjson.NodeCmd) var addr string var nodeID uint64 var errN, err error params := s.cfg.ChainParams 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.cfg.ConnMgr.DisconnectByID(int32(nodeID)) } else { if _, _, errP := net.SplitHostPort(c.Target); errP == nil || net.ParseIP(c.Target) != nil { addr = normalizeAddress(c.Target, params.DefaultPort) err = s.cfg.ConnMgr.DisconnectByAddr(addr) } else { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidParameter, Message: "invalid address or node ID", } } } if err != nil && peerExists(s.cfg.ConnMgr, addr, int32(nodeID)) { return nil, &btcjson.RPCError{ Code: btcjson.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.cfg.ConnMgr.RemoveByID(int32(nodeID)) } else { if _, _, errP := net.SplitHostPort(c.Target); errP == nil || net.ParseIP(c.Target) != nil { addr = normalizeAddress(c.Target, params.DefaultPort) err = s.cfg.ConnMgr.RemoveByAddr(addr) } else { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidParameter, Message: "invalid address or node ID", } } } if err != nil && peerExists(s.cfg.ConnMgr, addr, int32(nodeID)) { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCMisc, Message: "can't remove a temporary peer, use disconnect", } } case "connect": addr = normalizeAddress(c.Target, params.DefaultPort) // Default to temporary connections. subCmd := "temp" if c.ConnectSubCmd != nil { subCmd = *c.ConnectSubCmd } switch subCmd { case "perm", "temp": err = s.cfg.ConnMgr.Connect(addr, subCmd == "perm") default: return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidParameter, Message: "invalid subcommand for node connect", } } default: return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidParameter, Message: "invalid subcommand for node", } } if err != nil { return nil, &btcjson.RPCError{ Code: btcjson.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(connMgr rpcserverConnManager, addr string, nodeID int32) bool { for _, p := range connMgr.ConnectedPeers() { if p.ToPeer().ID() == nodeID || p.ToPeer().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, wire.WitnessEncoding); 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.(*btcjson.CreateRawTransactionCmd) // Validate the locktime, if given. if c.LockTime != nil && (*c.LockTime < 0 || *c.LockTime > int64(wire.MaxTxInSequenceNum)) { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidParameter, Message: "Locktime out of range", } } // Add all transaction inputs to a new transaction after performing // some validity checks. mtx := wire.NewMsgTx(wire.TxVersion) for _, input := range c.Inputs { txHash, err := chainhash.NewHashFromStr(input.Txid) if err != nil { return nil, rpcDecodeHexError(input.Txid) } prevOut := wire.NewOutPoint(txHash, input.Vout) txIn := wire.NewTxIn(prevOut, []byte{}, nil) 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. params := s.cfg.ChainParams for encodedAddr, amount := range c.Amounts { // Ensure amount is in the valid range for monetary amounts. if amount <= 0 || amount*btcutil.SatoshiPerBitcoin > btcutil.MaxSatoshi { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCType, Message: "Invalid amount", } } // Decode the provided address. addr, err := btcutil.DecodeAddress(encodedAddr, params) if err != nil { return nil, &btcjson.RPCError{ Code: btcjson.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 *btcutil.AddressPubKeyHash: case *btcutil.AddressScriptHash: default: return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidAddressOrKey, Message: "Invalid address or key", } } if !addr.IsForNet(params) { return nil, &btcjson.RPCError{ Code: btcjson.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 { context := "Failed to generate pay-to-address script" return nil, internalRPCError(err.Error(), context) } // Convert the amount to satoshi. satoshi, err := btcutil.NewAmount(amount) if err != nil { context := "Failed to convert amount" return nil, internalRPCError(err.Error(), context) } txOut := wire.NewTxOut(int64(satoshi), 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 } // handleDebugLevel handles debuglevel commands. func handleDebugLevel(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.DebugLevelCmd) // Special show command to list supported subsystems. if c.LevelSpec == "show" { return fmt.Sprintf("Supported subsystems %v", supportedSubsystems()), nil } err := parseAndSetDebugLevels(c.LevelSpec) if err != nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidParams.Code, Message: err.Error(), } } return "Done.", nil } // witnessToHex formats the passed witness stack as a slice of hex-encoded // strings to be used in a JSON response. func witnessToHex(witness wire.TxWitness) []string { // Ensure nil is returned when there are no entries versus an empty // slice so it can properly be omitted as necessary. if len(witness) == 0 { return nil } result := make([]string, 0, len(witness)) for _, wit := range witness { result = append(result, hex.EncodeToString(wit)) } return result } // createVinList returns a slice of JSON objects for the inputs of the passed // transaction. func createVinList(mtx *wire.MsgTx) []btcjson.Vin { // Coinbase transactions only have a single txin by definition. vinList := make([]btcjson.Vin, len(mtx.TxIn)) if blockchain.IsCoinBaseTx(mtx) { txIn := mtx.TxIn[0] vinList[0].Coinbase = hex.EncodeToString(txIn.SignatureScript) vinList[0].Sequence = txIn.Sequence vinList[0].Witness = witnessToHex(txIn.Witness) return vinList } for i, txIn := range mtx.TxIn { // The disassembled string will contain [error] inline // if the script doesn't fully parse, so ignore the // error here. disbuf, _ := txscript.DisasmString(txIn.SignatureScript) vinEntry := &vinList[i] vinEntry.Txid = txIn.PreviousOutPoint.Hash.String() vinEntry.Vout = txIn.PreviousOutPoint.Index vinEntry.Sequence = txIn.Sequence vinEntry.ScriptSig = &btcjson.ScriptSig{ Asm: disbuf, Hex: hex.EncodeToString(txIn.SignatureScript), } if mtx.HasWitness() { vinEntry.Witness = witnessToHex(txIn.Witness) } } return vinList } // createVoutList returns a slice of JSON objects for the outputs of the passed // transaction. func createVoutList(mtx *wire.MsgTx, chainParams *chaincfg.Params, filterAddrMap map[string]struct{}) []btcjson.Vout { voutList := make([]btcjson.Vout, 0, len(mtx.TxOut)) for i, v := range mtx.TxOut { // The disassembled string will contain [error] inline if the // script doesn't fully parse, so ignore the error here. disbuf, _ := txscript.DisasmString(v.PkScript) script := txscript.StripClaimScriptPrefix(v.PkScript) // Ignore the error here since an error means the script // couldn't parse and there is no additional information about // it anyways. scriptClass, addrs, reqSigs, _ := txscript.ExtractPkScriptAddrs(script, chainParams) // Encode the addresses while checking if the address passes the // filter when needed. passesFilter := len(filterAddrMap) == 0 encodedAddrs := make([]string, len(addrs)) for j, addr := range addrs { encodedAddr := addr.EncodeAddress() encodedAddrs[j] = encodedAddr // No need to check the map again if the filter already // passes. if passesFilter { continue } if _, exists := filterAddrMap[encodedAddr]; exists { passesFilter = true } } if !passesFilter { continue } var vout btcjson.Vout vout.N = uint32(i) vout.Value = btcutil.Amount(v.Value).ToBTC() vout.ScriptPubKey.Addresses = encodedAddrs vout.ScriptPubKey.Asm = disbuf vout.ScriptPubKey.Hex = hex.EncodeToString(v.PkScript) vout.ScriptPubKey.ReqSigs = int32(reqSigs) if len(script) < len(v.PkScript) { vout.ScriptPubKey.IsClaim = v.PkScript[0] == txscript.OP_CLAIMNAME || v.PkScript[0] == txscript.OP_UPDATECLAIM vout.ScriptPubKey.IsSupport = v.PkScript[0] == txscript.OP_SUPPORTCLAIM vout.ScriptPubKey.SubType = scriptClass.String() vout.ScriptPubKey.Type = txscript.ScriptClass.String(0) } else { vout.ScriptPubKey.Type = scriptClass.String() } // TODO here: isclaim, issupport, subtype, voutList = append(voutList, vout) } return voutList } // createTxRawResult converts the passed transaction and associated parameters // to a raw transaction JSON object. func createTxRawResult(chainParams *chaincfg.Params, mtx *wire.MsgTx, txHash string, blkHeader *wire.BlockHeader, blkHash string, blkHeight int32, chainHeight int32) (*btcjson.TxRawResult, error) { mtxHex, err := messageToHex(mtx) if err != nil { return nil, err } txReply := &btcjson.TxRawResult{ Hex: mtxHex, Txid: txHash, Hash: mtx.WitnessHash().String(), Size: int32(mtx.SerializeSize()), Vsize: int32(mempool.GetTxVirtualSize(btcutil.NewTx(mtx))), Weight: int32(blockchain.GetTransactionWeight(btcutil.NewTx(mtx))), Vin: createVinList(mtx), Vout: createVoutList(mtx, chainParams, nil), Version: uint32(mtx.Version), LockTime: mtx.LockTime, } if blkHeader != nil { // This is not a typo, they are identical in bitcoind as well. txReply.Time = blkHeader.Timestamp.Unix() txReply.Blocktime = blkHeader.Timestamp.Unix() txReply.BlockHash = blkHash txReply.Confirmations = uint64(1 + chainHeight - blkHeight) } return txReply, nil } // handleDecodeRawTransaction handles decoderawtransaction commands. func handleDecodeRawTransaction(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.DecodeRawTransactionCmd) // Deserialize the transaction. hexStr := c.HexTx if len(hexStr)%2 != 0 { hexStr = "0" + hexStr } serializedTx, err := hex.DecodeString(hexStr) if err != nil { return nil, rpcDecodeHexError(hexStr) } var mtx wire.MsgTx err = mtx.Deserialize(bytes.NewReader(serializedTx)) if err != nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCDeserialization, Message: "TX decode failed: " + err.Error(), } } // Create and return the result. txReply := btcjson.TxRawDecodeResult{ Txid: mtx.TxHash().String(), Version: mtx.Version, Locktime: mtx.LockTime, Vin: createVinList(&mtx), Vout: createVoutList(&mtx, s.cfg.ChainParams, nil), } return txReply, nil } // handleDecodeScript handles decodescript commands. func handleDecodeScript(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.DecodeScriptCmd) // Convert the hex script to bytes. hexStr := c.HexScript if len(hexStr)%2 != 0 { hexStr = "0" + hexStr } script, err := hex.DecodeString(hexStr) if err != nil { return nil, rpcDecodeHexError(hexStr) } // The disassembled string will contain [error] inline if the script // doesn't fully parse, so ignore the error here. disbuf, _ := txscript.DisasmString(script) // Get information about the script. // Ignore the error here since an error means the script couldn't parse // and there is no additinal information about it anyways. scriptClass, addrs, reqSigs, _ := txscript.ExtractPkScriptAddrs(script, s.cfg.ChainParams) addresses := make([]string, len(addrs)) for i, addr := range addrs { addresses[i] = addr.EncodeAddress() } // Convert the script itself to a pay-to-script-hash address. p2sh, err := btcutil.NewAddressScriptHash(script, s.cfg.ChainParams) if err != nil { context := "Failed to convert script to pay-to-script-hash" return nil, internalRPCError(err.Error(), context) } // Generate and return the reply. reply := btcjson.DecodeScriptResult{ Asm: disbuf, ReqSigs: int32(reqSigs), Type: scriptClass.String(), Addresses: addresses, } if scriptClass != txscript.ScriptHashTy { reply.P2sh = p2sh.EncodeAddress() } return reply, nil } // handleEstimateFee handles estimatefee commands. func handleEstimateFee(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.EstimateFeeCmd) if s.cfg.FeeEstimator == nil { return nil, errors.New("Fee estimation disabled") } if c.NumBlocks <= 0 { return -1.0, errors.New("Parameter NumBlocks must be positive") } feeRate, err := s.cfg.FeeEstimator.EstimateFee(uint32(c.NumBlocks)) if err != nil { return -1.0, err } // Convert to satoshis per kb. return float64(feeRate), nil } func handleGenerate(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { // Respond with an error if there are no addresses to pay the // created blocks to. if len(cfg.miningAddrs) == 0 { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInternal.Code, Message: "No payment addresses specified " + "via --miningaddr", } } // Respond with an error if there's virtually 0 chance of mining a block // with the CPU. if !s.cfg.ChainParams.GenerateSupported { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCDifficulty, Message: fmt.Sprintf("No support for `generate` on "+ "the current network, %s, as it's unlikely to "+ "be possible to mine a block with the CPU.", s.cfg.ChainParams.Net), } } c := cmd.(*btcjson.GenerateCmd) // Respond with an error if the client is requesting 0 blocks to be generated. if c.NumBlocks == 0 { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInternal.Code, Message: "Please request a nonzero number of blocks to generate.", } } // Create a reply reply := make([]string, c.NumBlocks) blockHashes, err := s.cfg.CPUMiner.GenerateNBlocks(c.NumBlocks, nil) if err != nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInternal.Code, Message: err.Error(), } } // Mine the correct number of blocks, assigning the hex representation of the // hash of each one to its place in the reply. for i, hash := range blockHashes { reply[i] = hash.String() } return reply, nil } // handleGenerateToAddress handles generate commands. func handleGenerateToAddress(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.GenerateToAddressCmd) payToAddr, err := btcutil.DecodeAddress(c.Address, s.cfg.ChainParams) // Respond with an error if there are no addresses to pay the // created blocks to. if err != nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidParameter, Message: "No payment addresses specified ", } } // cfg.miningAddrs = append(cfg.miningAddrs, maddr) // Respond with an error if there's virtually 0 chance of mining a block // with the CPU. if !s.cfg.ChainParams.GenerateSupported { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCDifficulty, Message: fmt.Sprintf("No support for `generatetoaddress` on "+ "the current network, %s, as it's unlikely to "+ "be possible to mine a block with the CPU.", s.cfg.ChainParams.Net), } } // Respond with an error if the client is requesting 0 blocks to be generated. if c.NumBlocks == 0 { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInternal.Code, Message: "Please request a nonzero number of blocks to generate.", } } // Create a reply reply := make([]string, c.NumBlocks) blockHashes, err := s.cfg.CPUMiner.GenerateNBlocks(uint32(c.NumBlocks), payToAddr) if err != nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInternal.Code, Message: err.Error(), } } // Mine the correct number of blocks, assigning the hex representation of the // hash of each one to its place in the reply. for i, hash := range blockHashes { reply[i] = hash.String() } return reply, nil } // handleGetAddedNodeInfo handles getaddednodeinfo commands. func handleGetAddedNodeInfo(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.GetAddedNodeInfoCmd) // Retrieve a list of persistent (added) peers from the server and // filter the list of peers per the specified address (if any). peers := s.cfg.ConnMgr.PersistentPeers() if c.Node != nil { node := *c.Node found := false for i, peer := range peers { if peer.ToPeer().Addr() == node { peers = peers[i : i+1] found = true } } if !found { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCClientNodeNotAdded, Message: "Node has not been added", } } } // Without the dns flag, the result is just a slice of the addresses as // strings. if !c.DNS { results := make([]string, 0, len(peers)) for _, peer := range peers { results = append(results, peer.ToPeer().Addr()) } return results, nil } // With the dns flag, the result is an array of JSON objects which // include the result of DNS lookups for each peer. results := make([]*btcjson.GetAddedNodeInfoResult, 0, len(peers)) for _, rpcPeer := range peers { // Set the "address" of the peer which could be an ip address // or a domain name. peer := rpcPeer.ToPeer() var result btcjson.GetAddedNodeInfoResult result.AddedNode = peer.Addr() result.Connected = btcjson.Bool(peer.Connected()) // Split the address into host and port portions so we can do // a DNS lookup against the host. When no port is specified in // the address, just use the address as the host. host, _, err := net.SplitHostPort(peer.Addr()) if err != nil { host = peer.Addr() } var ipList []string switch { case net.ParseIP(host) != nil, strings.HasSuffix(host, ".onion"): ipList = make([]string, 1) ipList[0] = host default: // Do a DNS lookup for the address. If the lookup fails, just // use the host. ips, err := btcdLookup(host) if err != nil { ipList = make([]string, 1) ipList[0] = host break } ipList = make([]string, 0, len(ips)) for _, ip := range ips { ipList = append(ipList, ip.String()) } } // Add the addresses and connection info to the result. addrs := make([]btcjson.GetAddedNodeInfoResultAddr, 0, len(ipList)) for _, ip := range ipList { var addr btcjson.GetAddedNodeInfoResultAddr addr.Address = ip addr.Connected = "false" if ip == host && peer.Connected() { addr.Connected = directionString(peer.Inbound()) } addrs = append(addrs, addr) } result.Addresses = &addrs results = append(results, &result) } return results, nil } // handleGetBestBlock implements the getbestblock command. func handleGetBestBlock(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { // All other "get block" commands give either the height, the // hash, or both but require the block SHA. This gets both for // the best block. best := s.cfg.Chain.BestSnapshot() result := &btcjson.GetBestBlockResult{ Hash: best.Hash.String(), Height: best.Height, } return result, nil } // handleGetBestBlockHash implements the getbestblockhash command. func handleGetBestBlockHash(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { best := s.cfg.Chain.BestSnapshot() return best.Hash.String(), nil } // getDifficultyRatio returns the proof-of-work difficulty as a multiple of the // minimum difficulty using the passed bits field from the header of a block. func getDifficultyRatio(bits uint32, params *chaincfg.Params) float64 { // The minimum difficulty is the max possible proof-of-work limit bits // converted back to a number. Note this is not the same as the proof of // work limit directly because the block difficulty is encoded in a block // with the compact form which loses precision. max := blockchain.CompactToBig(params.PowLimitBits) target := blockchain.CompactToBig(bits) difficulty := new(big.Rat).SetFrac(max, target) outString := difficulty.FloatString(8) diff, err := strconv.ParseFloat(outString, 64) if err != nil { rpcsLog.Errorf("Cannot get difficulty: %v", err) return 0 } return diff } // handleGetBlock implements the getblock command. func handleGetBlock(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.GetBlockCmd) // Load the raw block bytes from the database. hash, err := chainhash.NewHashFromStr(c.Hash) if err != nil { return nil, rpcDecodeHexError(c.Hash) } var blkBytes []byte err = s.cfg.DB.View(func(dbTx database.Tx) error { var err error blkBytes, err = dbTx.FetchBlock(hash) return err }) if err != nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCBlockNotFound, Message: "Block not found", } } // If verbosity is 0, return the serialized block as a hex encoded string. if c.Verbosity != nil && *c.Verbosity == 0 { return hex.EncodeToString(blkBytes), nil } // Otherwise, generate the JSON object and return it. // Deserialize the block. blk, err := btcutil.NewBlockFromBytes(blkBytes) if err != nil { context := "Failed to deserialize block" return nil, internalRPCError(err.Error(), context) } // Get the block height from chain. blockHeight, err := s.cfg.Chain.BlockHeightByHash(hash) if err != nil { context := "Failed to obtain block height" return nil, internalRPCError(err.Error(), context) } blk.SetHeight(blockHeight) best := s.cfg.Chain.BestSnapshot() // Get next block hash unless there are none. var nextHashString string if blockHeight < best.Height { nextHash, err := s.cfg.Chain.BlockHashByHeight(blockHeight + 1) if err != nil { context := "No next block" return nil, internalRPCError(err.Error(), context) } nextHashString = nextHash.String() } params := s.cfg.ChainParams blockHeader := &blk.MsgBlock().Header var prevHashString string if blockHeight > 0 { prevHashString = blockHeader.PrevBlock.String() } base := btcjson.GetBlockVerboseResultBase{ Hash: c.Hash, Version: blockHeader.Version, VersionHex: fmt.Sprintf("%08x", blockHeader.Version), MerkleRoot: blockHeader.MerkleRoot.String(), PreviousHash: prevHashString, Nonce: blockHeader.Nonce, Time: blockHeader.Timestamp.Unix(), Confirmations: int64(1 + best.Height - blockHeight), Height: int64(blockHeight), Size: int32(len(blkBytes)), StrippedSize: int32(blk.MsgBlock().SerializeSizeStripped()), Weight: int32(blockchain.GetBlockWeight(blk)), Bits: strconv.FormatInt(int64(blockHeader.Bits), 16), Difficulty: getDifficultyRatio(blockHeader.Bits, params), NextHash: nextHashString, ClaimTrie: blockHeader.ClaimTrie.String(), } if *c.Verbosity == 1 { transactions := blk.Transactions() txNames := make([]string, len(transactions)) for i, tx := range transactions { txNames[i] = tx.Hash().String() } base.TxCount = len(txNames) blockReply := btcjson.GetBlockVerboseResult{ GetBlockVerboseResultBase: base, Tx: txNames, } return blockReply, nil } txns := blk.Transactions() rawTxns := make([]btcjson.TxRawResult, len(txns)) for i, tx := range txns { rawTxn, err := createTxRawResult(params, tx.MsgTx(), tx.Hash().String(), blockHeader, hash.String(), blockHeight, best.Height) if err != nil { return nil, err } rawTxns[i] = *rawTxn } base.TxCount = len(rawTxns) blockReply := btcjson.GetBlockVerboseTxResult{ GetBlockVerboseResultBase: base, Tx: rawTxns, } return blockReply, nil } // softForkStatus converts a ThresholdState state into a human readable string // corresponding to the particular state. func softForkStatus(state blockchain.ThresholdState) (string, error) { switch state { case blockchain.ThresholdDefined: return "defined", nil case blockchain.ThresholdStarted: return "started", nil case blockchain.ThresholdLockedIn: return "lockedin", nil case blockchain.ThresholdActive: return "active", nil case blockchain.ThresholdFailed: return "failed", nil default: return "", fmt.Errorf("unknown deployment state: %v", state) } } // handleGetBlockChainInfo implements the getblockchaininfo command. func handleGetBlockChainInfo(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { // Obtain a snapshot of the current best known blockchain state. We'll // populate the response to this call primarily from this snapshot. params := s.cfg.ChainParams chain := s.cfg.Chain chainSnapshot := chain.BestSnapshot() chainInfo := &btcjson.GetBlockChainInfoResult{ Chain: params.Name, Blocks: chainSnapshot.Height, Headers: chainSnapshot.Height, BestBlockHash: chainSnapshot.Hash.String(), Difficulty: getDifficultyRatio(chainSnapshot.Bits, params), MedianTime: chainSnapshot.MedianTime.Unix(), Pruned: false, SoftForks: &btcjson.SoftForks{ Bip9SoftForks: make(map[string]*btcjson.Bip9SoftForkDescription), }, } // Next, populate the response with information describing the current // status of soft-forks deployed via the super-majority block // signalling mechanism. height := chainSnapshot.Height chainInfo.SoftForks.SoftForks = []*btcjson.SoftForkDescription{ { ID: "bip34", Version: 2, Reject: struct { Status bool `json:"status"` }{ Status: height >= params.BIP0034Height, }, }, { ID: "bip66", Version: 3, Reject: struct { Status bool `json:"status"` }{ Status: height >= params.BIP0066Height, }, }, { ID: "bip65", Version: 4, Reject: struct { Status bool `json:"status"` }{ Status: height >= params.BIP0065Height, }, }, } // Finally, query the BIP0009 version bits state for all currently // defined BIP0009 soft-fork deployments. for deployment, deploymentDetails := range params.Deployments { // Map the integer deployment ID into a human readable // fork-name. var forkName string switch deployment { case chaincfg.DeploymentTestDummy: forkName = "dummy" case chaincfg.DeploymentCSV: forkName = "csv" case chaincfg.DeploymentSegwit: forkName = "segwit" case chaincfg.DeploymentTaproot: forkName = "taproot" default: return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInternal.Code, Message: fmt.Sprintf("Unknown deployment %v "+ "detected", deployment), } } // Query the chain for the current status of the deployment as // identified by its deployment ID. deploymentStatus, err := chain.ThresholdState(uint32(deployment)) if err != nil { context := "Failed to obtain deployment status" return nil, internalRPCError(err.Error(), context) } // Attempt to convert the current deployment status into a // human readable string. If the status is unrecognized, then a // non-nil error is returned. statusString, err := softForkStatus(deploymentStatus) if err != nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInternal.Code, Message: fmt.Sprintf("unknown deployment status: %v", deploymentStatus), } } // Finally, populate the soft-fork description with all the // information gathered above. chainInfo.SoftForks.Bip9SoftForks[forkName] = &btcjson.Bip9SoftForkDescription{ Status: strings.ToLower(statusString), Bit: deploymentDetails.BitNumber, StartTime2: int64(deploymentDetails.StartTime), Timeout: int64(deploymentDetails.ExpireTime), Since: deploymentDetails.ForceActiveAt, } } return chainInfo, nil } // handleGetBlockCount implements the getblockcount command. func handleGetBlockCount(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { best := s.cfg.Chain.BestSnapshot() return int64(best.Height), nil } // handleGetBlockHash implements the getblockhash command. func handleGetBlockHash(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.GetBlockHashCmd) hash, err := s.cfg.Chain.BlockHashByHeight(int32(c.Index)) if err != nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCOutOfRange, Message: "Block number out of range", } } return hash.String(), nil } // handleGetBlockHeader implements the getblockheader command. func handleGetBlockHeader(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.GetBlockHeaderCmd) // Fetch the header from chain. hash, err := chainhash.NewHashFromStr(c.Hash) if err != nil { return nil, rpcDecodeHexError(c.Hash) } blockHeader, err := s.cfg.Chain.HeaderByHash(hash) if err != nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCBlockNotFound, Message: "Block not found", } } // When the verbose flag isn't set, simply return the serialized block // header as a hex-encoded string. if c.Verbose != nil && !*c.Verbose { var headerBuf bytes.Buffer err := blockHeader.Serialize(&headerBuf) if err != nil { context := "Failed to serialize block header" return nil, internalRPCError(err.Error(), context) } return hex.EncodeToString(headerBuf.Bytes()), nil } // The verbose flag is set, so generate the JSON object and return it. // Get the block height from chain. blockHeight, err := s.cfg.Chain.BlockHeightByHash(hash) if err != nil { context := "Failed to obtain block height" return nil, internalRPCError(err.Error(), context) } best := s.cfg.Chain.BestSnapshot() // Get next block hash unless there are none. var nextHashString string if blockHeight < best.Height { nextHash, err := s.cfg.Chain.BlockHashByHeight(blockHeight + 1) if err != nil { context := "No next block" return nil, internalRPCError(err.Error(), context) } nextHashString = nextHash.String() } params := s.cfg.ChainParams blockHeaderReply := btcjson.GetBlockHeaderVerboseResult{ Hash: c.Hash, Confirmations: int64(1 + best.Height - blockHeight), Height: blockHeight, Version: blockHeader.Version, VersionHex: fmt.Sprintf("%08x", blockHeader.Version), MerkleRoot: blockHeader.MerkleRoot.String(), NextHash: nextHashString, PreviousHash: blockHeader.PrevBlock.String(), Nonce: uint64(blockHeader.Nonce), Time: blockHeader.Timestamp.Unix(), Bits: strconv.FormatInt(int64(blockHeader.Bits), 16), Difficulty: getDifficultyRatio(blockHeader.Bits, params), } return blockHeaderReply, nil } // encodeTemplateID encodes the passed details into an ID that can be used to // uniquely identify a block template. func encodeTemplateID(prevHash *chainhash.Hash, lastGenerated time.Time) string { return fmt.Sprintf("%s-%d", prevHash.String(), lastGenerated.Unix()) } // decodeTemplateID decodes an ID that is used to uniquely identify a block // template. This is mainly used as a mechanism to track when to update clients // that are using long polling for block templates. The ID consists of the // previous block hash for the associated template and the time the associated // template was generated. func decodeTemplateID(templateID string) (*chainhash.Hash, int64, error) { fields := strings.Split(templateID, "-") if len(fields) != 2 { return nil, 0, errors.New("invalid longpollid format") } prevHash, err := chainhash.NewHashFromStr(fields[0]) if err != nil { return nil, 0, errors.New("invalid longpollid format") } lastGenerated, err := strconv.ParseInt(fields[1], 10, 64) if err != nil { return nil, 0, errors.New("invalid longpollid format") } return prevHash, lastGenerated, nil } // notifyLongPollers notifies any channels that have been registered to be // notified when block templates are stale. // // This function MUST be called with the state locked. func (state *gbtWorkState) notifyLongPollers(latestHash *chainhash.Hash, lastGenerated time.Time) { // Notify anything that is waiting for a block template update from a // hash which is not the hash of the tip of the best chain since their // work is now invalid. for hash, channels := range state.notifyMap { if !hash.IsEqual(latestHash) { for _, c := range channels { close(c) } delete(state.notifyMap, hash) } } // Return now if the provided last generated timestamp has not been // initialized. if lastGenerated.IsZero() { return } // Return now if there is nothing registered for updates to the current // best block hash. channels, ok := state.notifyMap[*latestHash] if !ok { return } // Notify anything that is waiting for a block template update from a // block template generated before the most recently generated block // template. lastGeneratedUnix := lastGenerated.Unix() for lastGen, c := range channels { if lastGen < lastGeneratedUnix { close(c) delete(channels, lastGen) } } // Remove the entry altogether if there are no more registered // channels. if len(channels) == 0 { delete(state.notifyMap, *latestHash) } } // NotifyBlockConnected uses the newly-connected block to notify any long poll // clients with a new block template when their existing block template is // stale due to the newly connected block. func (state *gbtWorkState) NotifyBlockConnected(blockHash *chainhash.Hash) { go func() { state.Lock() defer state.Unlock() state.notifyLongPollers(blockHash, state.lastTxUpdate) }() } // NotifyMempoolTx uses the new last updated time for the transaction memory // pool to notify any long poll clients with a new block template when their // existing block template is stale due to enough time passing and the contents // of the memory pool changing. func (state *gbtWorkState) NotifyMempoolTx(lastUpdated time.Time) { go func() { state.Lock() defer state.Unlock() // No need to notify anything if no block templates have been generated // yet. if state.prevHash == nil || state.lastGenerated.IsZero() { return } if time.Now().After(state.lastGenerated.Add(time.Second * gbtRegenerateSeconds)) { state.notifyLongPollers(state.prevHash, lastUpdated) } }() } // templateUpdateChan returns a channel that will be closed once the block // template associated with the passed previous hash and last generated time // is stale. The function will return existing channels for duplicate // parameters which allows multiple clients to wait for the same block template // without requiring a different channel for each client. // // This function MUST be called with the state locked. func (state *gbtWorkState) templateUpdateChan(prevHash *chainhash.Hash, lastGenerated int64) chan struct{} { // Either get the current list of channels waiting for updates about // changes to block template for the previous hash or create a new one. channels, ok := state.notifyMap[*prevHash] if !ok { m := make(map[int64]chan struct{}) state.notifyMap[*prevHash] = m channels = m } // Get the current channel associated with the time the block template // was last generated or create a new one. c, ok := channels[lastGenerated] if !ok { c = make(chan struct{}) channels[lastGenerated] = c } return c } // updateBlockTemplate creates or updates a block template for the work state. // A new block template will be generated when the current best block has // changed or the transactions in the memory pool have been updated and it has // been long enough since the last template was generated. Otherwise, the // timestamp for the existing block template is updated (and possibly the // difficulty on testnet per the consesus rules). Finally, if the // useCoinbaseValue flag is false and the existing block template does not // already contain a valid payment address, the block template will be updated // with a randomly selected payment address from the list of configured // addresses. // // This function MUST be called with the state locked. func (state *gbtWorkState) updateBlockTemplate(s *rpcServer, useCoinbaseValue bool) error { generator := s.cfg.Generator lastTxUpdate := generator.TxSource().LastUpdated() if lastTxUpdate.IsZero() { lastTxUpdate = time.Now() } // Generate a new block template when the current best block has // changed or the transactions in the memory pool have been updated and // it has been at least gbtRegenerateSecond since the last template was // generated. var msgBlock *wire.MsgBlock var targetDifficulty string latestHash := &s.cfg.Chain.BestSnapshot().Hash template := state.template if template == nil || state.prevHash == nil || !state.prevHash.IsEqual(latestHash) || (state.lastTxUpdate != lastTxUpdate && time.Now().After(state.lastGenerated.Add(time.Second* gbtRegenerateSeconds))) { // Reset the previous best hash the block template was generated // against so any errors below cause the next invocation to try // again. state.prevHash = nil // Choose a payment address at random if the caller requests a // full coinbase as opposed to only the pertinent details needed // to create their own coinbase. var payAddr btcutil.Address if !useCoinbaseValue { payAddr = cfg.miningAddrs[rand.Intn(len(cfg.miningAddrs))] } // Create a new block template that has a coinbase which anyone // can redeem. This is only acceptable because the returned // block template doesn't include the coinbase, so the caller // will ultimately create their own coinbase which pays to the // appropriate address(es). blkTemplate, err := generator.NewBlockTemplate(payAddr) if err != nil { return internalRPCError("Failed to create new block "+ "template: "+err.Error(), "") } template = blkTemplate msgBlock = template.Block targetDifficulty = fmt.Sprintf("%064x", blockchain.CompactToBig(msgBlock.Header.Bits)) // Get the minimum allowed timestamp for the block based on the // median timestamp of the last several blocks per the chain // consensus rules. best := s.cfg.Chain.BestSnapshot() minTimestamp := mining.MinimumMedianTime(best) // Update work state to ensure another block template isn't // generated until needed. state.template = template state.lastGenerated = time.Now() state.lastTxUpdate = lastTxUpdate state.prevHash = latestHash state.minTimestamp = minTimestamp rpcsLog.Debugf("Generated block template (timestamp %v, "+ "target %s, merkle root %s)", msgBlock.Header.Timestamp, targetDifficulty, msgBlock.Header.MerkleRoot) // Notify any clients that are long polling about the new // template. state.notifyLongPollers(latestHash, lastTxUpdate) } else { // At this point, there is a saved block template and another // request for a template was made, but either the available // transactions haven't change or it hasn't been long enough to // trigger a new block template to be generated. So, update the // existing block template. // When the caller requires a full coinbase as opposed to only // the pertinent details needed to create their own coinbase, // add a payment address to the output of the coinbase of the // template if it doesn't already have one. Since this requires // mining addresses to be specified via the config, an error is // returned if none have been specified. if !useCoinbaseValue && !template.ValidPayAddress { // Choose a payment address at random. payToAddr := cfg.miningAddrs[rand.Intn(len(cfg.miningAddrs))] // Update the block coinbase output of the template to // pay to the randomly selected payment address. pkScript, err := txscript.PayToAddrScript(payToAddr) if err != nil { context := "Failed to create pay-to-addr script" return internalRPCError(err.Error(), context) } template.Block.Transactions[0].TxOut[0].PkScript = pkScript template.ValidPayAddress = true // Update the merkle root. block := btcutil.NewBlock(template.Block) merkles := blockchain.BuildMerkleTreeStore(block.Transactions(), false) template.Block.Header.MerkleRoot = *merkles[len(merkles)-1] } // Set locals for convenience. msgBlock = template.Block targetDifficulty = fmt.Sprintf("%064x", blockchain.CompactToBig(msgBlock.Header.Bits)) // Update the time of the block template to the current time // while accounting for the median time of the past several // blocks per the chain consensus rules. generator.UpdateBlockTime(msgBlock) msgBlock.Header.Nonce = 0 rpcsLog.Debugf("Updated block template (timestamp %v, "+ "target %s)", msgBlock.Header.Timestamp, targetDifficulty) } return nil } // blockTemplateResult returns the current block template associated with the // state as a btcjson.GetBlockTemplateResult that is ready to be encoded to JSON // and returned to the caller. // // This function MUST be called with the state locked. func (state *gbtWorkState) blockTemplateResult(useCoinbaseValue bool, submitOld *bool) (*btcjson.GetBlockTemplateResult, error) { // Ensure the timestamps are still in valid range for the template. // This should really only ever happen if the local clock is changed // after the template is generated, but it's important to avoid serving // invalid block templates. template := state.template msgBlock := template.Block header := &msgBlock.Header adjustedTime := state.timeSource.AdjustedTime() maxTime := adjustedTime.Add(time.Second * blockchain.MaxTimeOffsetSeconds) if header.Timestamp.After(maxTime) { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCOutOfRange, Message: fmt.Sprintf("The template time is after the "+ "maximum allowed time for a block - template "+ "time %v, maximum time %v", adjustedTime, maxTime), } } // Convert each transaction in the block template to a template result // transaction. The result does not include the coinbase, so notice // the adjustments to the various lengths and indices. numTx := len(msgBlock.Transactions) transactions := make([]btcjson.GetBlockTemplateResultTx, 0, numTx-1) txIndex := make(map[chainhash.Hash]int64, numTx) for i, tx := range msgBlock.Transactions { txID := tx.TxHash() txIndex[txID] = int64(i) // Skip the coinbase transaction. if i == 0 { continue } // Create an array of 1-based indices to transactions that come // before this one in the transactions list which this one // depends on. This is necessary since the created block must // ensure proper ordering of the dependencies. A map is used // before creating the final array to prevent duplicate entries // when multiple inputs reference the same transaction. dependsMap := make(map[int64]struct{}) for _, txIn := range tx.TxIn { if idx, ok := txIndex[txIn.PreviousOutPoint.Hash]; ok { dependsMap[idx] = struct{}{} } } depends := make([]int64, 0, len(dependsMap)) for idx := range dependsMap { depends = append(depends, idx) } // Serialize the transaction for later conversion to hex. txBuf := bytes.NewBuffer(make([]byte, 0, tx.SerializeSize())) if err := tx.Serialize(txBuf); err != nil { context := "Failed to serialize transaction" return nil, internalRPCError(err.Error(), context) } bTx := btcutil.NewTx(tx) resultTx := btcjson.GetBlockTemplateResultTx{ Data: hex.EncodeToString(txBuf.Bytes()), TxID: txID.String(), Hash: tx.WitnessHash().String(), Depends: depends, Fee: template.Fees[i], SigOps: template.SigOpCosts[i], Weight: blockchain.GetTransactionWeight(bTx), } transactions = append(transactions, resultTx) } // Generate the block template reply. Note that following mutations are // implied by the included or omission of fields: // Including MinTime -> time/decrement // Omitting CoinbaseTxn -> coinbase, generation targetDifficulty := fmt.Sprintf("%064x", blockchain.CompactToBig(header.Bits)) templateID := encodeTemplateID(state.prevHash, state.lastGenerated) reply := btcjson.GetBlockTemplateResult{ Bits: strconv.FormatInt(int64(header.Bits), 16), CurTime: header.Timestamp.Unix(), Height: int64(template.Height), PreviousHash: header.PrevBlock.String(), WeightLimit: blockchain.MaxBlockWeight, SigOpLimit: blockchain.MaxBlockSigOpsCost, SizeLimit: wire.MaxBlockPayload, Transactions: transactions, Version: header.Version, LongPollID: templateID, SubmitOld: submitOld, Target: targetDifficulty, MinTime: state.minTimestamp.Unix(), MaxTime: maxTime.Unix(), Mutable: gbtMutableFields, NonceRange: gbtNonceRange, Capabilities: gbtCapabilities, ClaimTrieHash: header.ClaimTrie.String(), } // If the generated block template includes transactions with witness // data, then include the witness commitment in the GBT result. if template.WitnessCommitment != nil { reply.DefaultWitnessCommitment = hex.EncodeToString(template.WitnessCommitment) reply.Rules = append(reply.Rules, "!segwit") } if useCoinbaseValue { reply.CoinbaseAux = gbtCoinbaseAux reply.CoinbaseValue = &msgBlock.Transactions[0].TxOut[0].Value } else { // Ensure the template has a valid payment address associated // with it when a full coinbase is requested. if !template.ValidPayAddress { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInternal.Code, Message: "A coinbase transaction has been " + "requested, but the server has not " + "been configured with any payment " + "addresses via --miningaddr", } } // Serialize the transaction for conversion to hex. tx := msgBlock.Transactions[0] txBuf := bytes.NewBuffer(make([]byte, 0, tx.SerializeSize())) if err := tx.Serialize(txBuf); err != nil { context := "Failed to serialize transaction" return nil, internalRPCError(err.Error(), context) } resultTx := btcjson.GetBlockTemplateResultTx{ Data: hex.EncodeToString(txBuf.Bytes()), Hash: tx.TxHash().String(), Depends: []int64{}, Fee: template.Fees[0], SigOps: template.SigOpCosts[0], } reply.CoinbaseTxn = &resultTx } return &reply, nil } // handleGetBlockTemplateLongPoll is a helper for handleGetBlockTemplateRequest // which deals with handling long polling for block templates. When a caller // sends a request with a long poll ID that was previously returned, a response // is not sent until the caller should stop working on the previous block // template in favor of the new one. In particular, this is the case when the // old block template is no longer valid due to a solution already being found // and added to the block chain, or new transactions have shown up and some time // has passed without finding a solution. // // See https://en.bitcoin.it/wiki/BIP_0022 for more details. func handleGetBlockTemplateLongPoll(s *rpcServer, longPollID string, useCoinbaseValue bool, closeChan <-chan struct{}) (interface{}, error) { state := s.gbtWorkState state.Lock() // The state unlock is intentionally not deferred here since it needs to // be manually unlocked before waiting for a notification about block // template changes. if err := state.updateBlockTemplate(s, useCoinbaseValue); err != nil { state.Unlock() return nil, err } // Just return the current block template if the long poll ID provided by // the caller is invalid. prevHash, lastGenerated, err := decodeTemplateID(longPollID) if err != nil { result, err := state.blockTemplateResult(useCoinbaseValue, nil) if err != nil { state.Unlock() return nil, err } state.Unlock() return result, nil } // Return the block template now if the specific block template // identified by the long poll ID no longer matches the current block // template as this means the provided template is stale. prevTemplateHash := &state.template.Block.Header.PrevBlock if !prevHash.IsEqual(prevTemplateHash) || lastGenerated != state.lastGenerated.Unix() { // Include whether or not it is valid to submit work against the // old block template depending on whether or not a solution has // already been found and added to the block chain. submitOld := prevHash.IsEqual(prevTemplateHash) result, err := state.blockTemplateResult(useCoinbaseValue, &submitOld) if err != nil { state.Unlock() return nil, err } state.Unlock() return result, nil } // Register the previous hash and last generated time for notifications // Get a channel that will be notified when the template associated with // the provided ID is stale and a new block template should be returned to // the caller. longPollChan := state.templateUpdateChan(prevHash, lastGenerated) state.Unlock() select { // When the client closes before it's time to send a reply, just return // now so the goroutine doesn't hang around. case <-closeChan: return nil, ErrClientQuit // Wait until signal received to send the reply. case <-longPollChan: // Fallthrough } // Get the lastest block template state.Lock() defer state.Unlock() if err := state.updateBlockTemplate(s, useCoinbaseValue); err != nil { return nil, err } // Include whether or not it is valid to submit work against the old // block template depending on whether or not a solution has already // been found and added to the block chain. submitOld := prevHash.IsEqual(&state.template.Block.Header.PrevBlock) result, err := state.blockTemplateResult(useCoinbaseValue, &submitOld) if err != nil { return nil, err } return result, nil } // handleGetBlockTemplateRequest is a helper for handleGetBlockTemplate which // deals with generating and returning block templates to the caller. It // handles both long poll requests as specified by BIP 0022 as well as regular // requests. In addition, it detects the capabilities reported by the caller // in regards to whether or not it supports creating its own coinbase (the // coinbasetxn and coinbasevalue capabilities) and modifies the returned block // template accordingly. func handleGetBlockTemplateRequest(s *rpcServer, request *btcjson.TemplateRequest, closeChan <-chan struct{}) (interface{}, error) { // Extract the relevant passed capabilities and restrict the result to // either a coinbase value or a coinbase transaction object depending on // the request. Default to only providing a coinbase value. useCoinbaseValue := true if request != nil { var hasCoinbaseValue, hasCoinbaseTxn bool for _, capability := range request.Capabilities { switch capability { case "coinbasetxn": hasCoinbaseTxn = true case "coinbasevalue": hasCoinbaseValue = true } } if hasCoinbaseTxn && !hasCoinbaseValue { useCoinbaseValue = false } } // When a coinbase transaction has been requested, respond with an error // if there are no addresses to pay the created block template to. if !useCoinbaseValue && len(cfg.miningAddrs) == 0 { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInternal.Code, Message: "A coinbase transaction has been requested, " + "but the server has not been configured with " + "any payment addresses via --miningaddr", } } // Return an error if there are no peers connected since there is no // way to relay a found block or receive transactions to work on. // However, allow this state when running in the regression test or // simulation test mode. if !(cfg.RegressionTest || cfg.SimNet) && s.cfg.ConnMgr.ConnectedCount() == 0 { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCClientNotConnected, Message: "Bitcoin is not connected", } } // No point in generating or accepting work before the chain is synced. currentHeight := s.cfg.Chain.BestSnapshot().Height if currentHeight != 0 && !s.cfg.SyncMgr.IsCurrent() { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCClientInInitialDownload, Message: "Bitcoin is downloading blocks...", } } // When a long poll ID was provided, this is a long poll request by the // client to be notified when block template referenced by the ID should // be replaced with a new one. if request != nil && request.LongPollID != "" { return handleGetBlockTemplateLongPoll(s, request.LongPollID, useCoinbaseValue, closeChan) } // Protect concurrent access when updating block templates. state := s.gbtWorkState state.Lock() defer state.Unlock() // Get and return a block template. A new block template will be // generated when the current best block has changed or the transactions // in the memory pool have been updated and it has been at least five // seconds since the last template was generated. Otherwise, the // timestamp for the existing block template is updated (and possibly // the difficulty on testnet per the consesus rules). if err := state.updateBlockTemplate(s, useCoinbaseValue); err != nil { return nil, err } return state.blockTemplateResult(useCoinbaseValue, nil) } // chainErrToGBTErrString converts an error returned from btcchain to a string // which matches the reasons and format described in BIP0022 for rejection // reasons. func chainErrToGBTErrString(err error) string { // When the passed error is not a RuleError, just return a generic // rejected string with the error text. ruleErr, ok := err.(blockchain.RuleError) if !ok { return "rejected: " + err.Error() } switch ruleErr.ErrorCode { case blockchain.ErrDuplicateBlock: return "duplicate" case blockchain.ErrBlockTooBig: return "bad-blk-length" case blockchain.ErrBlockWeightTooHigh: return "bad-blk-weight" case blockchain.ErrBlockVersionTooOld: return "bad-version" case blockchain.ErrInvalidTime: return "bad-time" case blockchain.ErrTimeTooOld: return "time-too-old" case blockchain.ErrTimeTooNew: return "time-too-new" case blockchain.ErrDifficultyTooLow: return "bad-diffbits" case blockchain.ErrUnexpectedDifficulty: return "bad-diffbits" case blockchain.ErrHighHash: return "high-hash" case blockchain.ErrBadMerkleRoot: return "bad-txnmrklroot" case blockchain.ErrBadCheckpoint: return "bad-checkpoint" case blockchain.ErrForkTooOld: return "fork-too-old" case blockchain.ErrCheckpointTimeTooOld: return "checkpoint-time-too-old" case blockchain.ErrNoTransactions: return "bad-txns-none" case blockchain.ErrNoTxInputs: return "bad-txns-noinputs" case blockchain.ErrNoTxOutputs: return "bad-txns-nooutputs" case blockchain.ErrTxTooBig: return "bad-txns-size" case blockchain.ErrBadTxOutValue: return "bad-txns-outputvalue" case blockchain.ErrDuplicateTxInputs: return "bad-txns-dupinputs" case blockchain.ErrBadTxInput: return "bad-txns-badinput" case blockchain.ErrMissingTxOut: return "bad-txns-missinginput" case blockchain.ErrUnfinalizedTx: return "bad-txns-unfinalizedtx" case blockchain.ErrDuplicateTx: return "bad-txns-duplicate" case blockchain.ErrOverwriteTx: return "bad-txns-overwrite" case blockchain.ErrImmatureSpend: return "bad-txns-maturity" case blockchain.ErrSpendTooHigh: return "bad-txns-highspend" case blockchain.ErrBadFees: return "bad-txns-fees" case blockchain.ErrTooManySigOps: return "high-sigops" case blockchain.ErrFirstTxNotCoinbase: return "bad-txns-nocoinbase" case blockchain.ErrMultipleCoinbases: return "bad-txns-multicoinbase" case blockchain.ErrBadCoinbaseScriptLen: return "bad-cb-length" case blockchain.ErrBadCoinbaseValue: return "bad-cb-value" case blockchain.ErrMissingCoinbaseHeight: return "bad-cb-height" case blockchain.ErrBadCoinbaseHeight: return "bad-cb-height" case blockchain.ErrScriptMalformed: return "bad-script-malformed" case blockchain.ErrScriptValidation: return "bad-script-validate" case blockchain.ErrUnexpectedWitness: return "unexpected-witness" case blockchain.ErrInvalidWitnessCommitment: return "bad-witness-nonce-size" case blockchain.ErrWitnessCommitmentMismatch: return "bad-witness-merkle-match" case blockchain.ErrPreviousBlockUnknown: return "prev-blk-not-found" case blockchain.ErrInvalidAncestorBlock: return "bad-prevblk" case blockchain.ErrPrevBlockNotBest: return "inconclusive-not-best-prvblk" } return "rejected: " + err.Error() } // handleGetBlockTemplateProposal is a helper for handleGetBlockTemplate which // deals with block proposals. // // See https://en.bitcoin.it/wiki/BIP_0023 for more details. func handleGetBlockTemplateProposal(s *rpcServer, request *btcjson.TemplateRequest) (interface{}, error) { hexData := request.Data if hexData == "" { return false, &btcjson.RPCError{ Code: btcjson.ErrRPCType, Message: fmt.Sprintf("Data must contain the " + "hex-encoded serialized block that is being " + "proposed"), } } // Ensure the provided data is sane and deserialize the proposed block. if len(hexData)%2 != 0 { hexData = "0" + hexData } dataBytes, err := hex.DecodeString(hexData) if err != nil { return false, &btcjson.RPCError{ Code: btcjson.ErrRPCDeserialization, Message: fmt.Sprintf("Data must be "+ "hexadecimal string (not %q)", hexData), } } var msgBlock wire.MsgBlock if err := msgBlock.Deserialize(bytes.NewReader(dataBytes)); err != nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCDeserialization, Message: "Block decode failed: " + err.Error(), } } block := btcutil.NewBlock(&msgBlock) // Ensure the block is building from the expected previous block. expectedPrevHash := s.cfg.Chain.BestSnapshot().Hash prevHash := &block.MsgBlock().Header.PrevBlock if !expectedPrevHash.IsEqual(prevHash) { return "bad-prevblk", nil } if err := s.cfg.Chain.CheckConnectBlockTemplate(block); err != nil { if _, ok := err.(blockchain.RuleError); !ok { errStr := fmt.Sprintf("Failed to process block proposal: %v", err) rpcsLog.Error(errStr) return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCVerify, Message: errStr, } } rpcsLog.Infof("Rejected block proposal: %v", err) return chainErrToGBTErrString(err), nil } return nil, nil } // handleGetBlockTemplate implements the getblocktemplate command. // // See https://en.bitcoin.it/wiki/BIP_0022 and // https://en.bitcoin.it/wiki/BIP_0023 for more details. func handleGetBlockTemplate(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.GetBlockTemplateCmd) request := c.Request // Set the default mode and override it if supplied. mode := "template" if request != nil && request.Mode != "" { mode = request.Mode } switch mode { case "template": return handleGetBlockTemplateRequest(s, request, closeChan) case "proposal": return handleGetBlockTemplateProposal(s, request) } return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidParameter, Message: "Invalid mode", } } // handleGetCFilter implements the getcfilter command. func handleGetCFilter(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { if s.cfg.CfIndex == nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCNoCFIndex, Message: "The CF index must be enabled for this command", } } c := cmd.(*btcjson.GetCFilterCmd) hash, err := chainhash.NewHashFromStr(c.Hash) if err != nil { return nil, rpcDecodeHexError(c.Hash) } filterBytes, err := s.cfg.CfIndex.FilterByBlockHash(hash, c.FilterType) if err != nil { rpcsLog.Debugf("Could not find committed filter for %v: %v", hash, err) return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCBlockNotFound, Message: "Block not found", } } rpcsLog.Debugf("Found committed filter for %v", hash) return hex.EncodeToString(filterBytes), nil } // handleGetCFilterHeader implements the getcfilterheader command. func handleGetCFilterHeader(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { if s.cfg.CfIndex == nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCNoCFIndex, Message: "The CF index must be enabled for this command", } } c := cmd.(*btcjson.GetCFilterHeaderCmd) hash, err := chainhash.NewHashFromStr(c.Hash) if err != nil { return nil, rpcDecodeHexError(c.Hash) } headerBytes, err := s.cfg.CfIndex.FilterHeaderByBlockHash(hash, c.FilterType) if len(headerBytes) > 0 { rpcsLog.Debugf("Found header of committed filter for %v", hash) } else { rpcsLog.Debugf("Could not find header of committed filter for %v: %v", hash, err) return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCBlockNotFound, Message: "Block not found", } } hash.SetBytes(headerBytes) return hash.String(), nil } // handleGetConnectionCount implements the getconnectioncount command. func handleGetConnectionCount(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { return s.cfg.ConnMgr.ConnectedCount(), nil } // handleGetCurrentNet implements the getcurrentnet command. func handleGetCurrentNet(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { return s.cfg.ChainParams.Net, nil } // handleGetDifficulty implements the getdifficulty command. func handleGetDifficulty(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { best := s.cfg.Chain.BestSnapshot() return getDifficultyRatio(best.Bits, s.cfg.ChainParams), nil } // handleGetGenerate implements the getgenerate command. func handleGetGenerate(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { return s.cfg.CPUMiner.IsMining(), nil } // handleGetHashesPerSec implements the gethashespersec command. func handleGetHashesPerSec(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { return int64(s.cfg.CPUMiner.HashesPerSecond()), nil } // handleGetHeaders implements the getheaders command. // // NOTE: This is a btcsuite extension originally ported from // github.com/decred/dcrd. func handleGetHeaders(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.GetHeadersCmd) // Fetch the requested headers from chain while respecting the provided // block locators and stop hash. blockLocators := make([]*chainhash.Hash, len(c.BlockLocators)) for i := range c.BlockLocators { blockLocator, err := chainhash.NewHashFromStr(c.BlockLocators[i]) if err != nil { return nil, rpcDecodeHexError(c.BlockLocators[i]) } blockLocators[i] = blockLocator } var hashStop chainhash.Hash if c.HashStop != "" { err := chainhash.Decode(&hashStop, c.HashStop) if err != nil { return nil, rpcDecodeHexError(c.HashStop) } } headers := s.cfg.SyncMgr.LocateHeaders(blockLocators, &hashStop) // Return the serialized block headers as hex-encoded strings. hexBlockHeaders := make([]string, len(headers)) var buf bytes.Buffer for i, h := range headers { err := h.Serialize(&buf) if err != nil { return nil, internalRPCError(err.Error(), "Failed to serialize block header") } hexBlockHeaders[i] = hex.EncodeToString(buf.Bytes()) buf.Reset() } return hexBlockHeaders, nil } // handleGetInfo implements the getinfo command. We only return the fields // that are not related to wallet functionality. func handleGetInfo(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { best := s.cfg.Chain.BestSnapshot() ret := &btcjson.InfoChainResult{ Version: int32(1000000*appMajor + 10000*appMinor + 100*appPatch), ProtocolVersion: int32(maxProtocolVersion), Blocks: best.Height, TimeOffset: int64(s.cfg.TimeSource.Offset().Seconds()), Connections: s.cfg.ConnMgr.ConnectedCount(), Proxy: cfg.Proxy, Difficulty: getDifficultyRatio(best.Bits, s.cfg.ChainParams), TestNet: cfg.TestNet3, RelayFee: cfg.minRelayTxFee.ToBTC(), } return ret, nil } // handleGetMempoolInfo implements the getmempoolinfo command. func handleGetMempoolInfo(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { mempoolTxns := s.cfg.TxMemPool.TxDescs() var numBytes int64 for _, txD := range mempoolTxns { numBytes += int64(txD.Tx.MsgTx().SerializeSize()) } ret := &btcjson.GetMempoolInfoResult{ Size: int64(len(mempoolTxns)), Bytes: numBytes, } return ret, nil } // handleGetMiningInfo implements the getmininginfo command. We only return the // fields that are not related to wallet functionality. func handleGetMiningInfo(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { // Create a default getnetworkhashps command to use defaults and make // use of the existing getnetworkhashps handler. gnhpsCmd := btcjson.NewGetNetworkHashPSCmd(nil, nil) networkHashesPerSecIface, err := handleGetNetworkHashPS(s, gnhpsCmd, closeChan) if err != nil { return nil, err } networkHashesPerSec, ok := networkHashesPerSecIface.(int64) if !ok { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInternal.Code, Message: "networkHashesPerSec is not an int64", } } best := s.cfg.Chain.BestSnapshot() result := btcjson.GetMiningInfoResult{ Blocks: int64(best.Height), CurrentBlockSize: best.BlockSize, CurrentBlockWeight: best.BlockWeight, CurrentBlockTx: best.NumTxns, Difficulty: getDifficultyRatio(best.Bits, s.cfg.ChainParams), Generate: s.cfg.CPUMiner.IsMining(), GenProcLimit: s.cfg.CPUMiner.NumWorkers(), HashesPerSec: s.cfg.CPUMiner.HashesPerSecond(), NetworkHashPS: float64(networkHashesPerSec), PooledTx: uint64(s.cfg.TxMemPool.Count()), TestNet: cfg.TestNet3, } return &result, nil } // handleGetNetTotals implements the getnettotals command. func handleGetNetTotals(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { totalBytesRecv, totalBytesSent := s.cfg.ConnMgr.NetTotals() reply := &btcjson.GetNetTotalsResult{ TotalBytesRecv: totalBytesRecv, TotalBytesSent: totalBytesSent, TimeMillis: time.Now().UTC().UnixNano() / int64(time.Millisecond), } return reply, nil } // handleGetNetworkHashPS implements the getnetworkhashps command. func handleGetNetworkHashPS(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { // Note: All valid error return paths should return an int64. // Literal zeros are inferred as int, and won't coerce to int64 // because the return value is an interface{}. c := cmd.(*btcjson.GetNetworkHashPSCmd) // When the passed height is too high or zero, just return 0 now // since we can't reasonably calculate the number of network hashes // per second from invalid values. When it's negative, use the current // best block height. best := s.cfg.Chain.BestSnapshot() endHeight := int32(-1) if c.Height != nil { endHeight = int32(*c.Height) } if endHeight > best.Height || endHeight == 0 { return int64(0), nil } if endHeight < 0 { endHeight = best.Height } // Calculate the number of blocks per retarget interval based on the // chain parameters. blocksPerRetarget := int32(s.cfg.ChainParams.TargetTimespan / s.cfg.ChainParams.TargetTimePerBlock) // Calculate the starting block height based on the passed number of // blocks. When the passed value is negative, use the last block the // difficulty changed as the starting height. Also make sure the // starting height is not before the beginning of the chain. numBlocks := int32(120) if c.Blocks != nil { numBlocks = int32(*c.Blocks) } var startHeight int32 if numBlocks <= 0 { startHeight = endHeight - ((endHeight % blocksPerRetarget) + 1) } else { startHeight = endHeight - numBlocks } if startHeight < 0 { startHeight = 0 } rpcsLog.Debugf("Calculating network hashes per second from %d to %d", startHeight, endHeight) // Find the min and max block timestamps as well as calculate the total // amount of work that happened between the start and end blocks. var minTimestamp, maxTimestamp time.Time totalWork := big.NewInt(0) for curHeight := startHeight; curHeight <= endHeight; curHeight++ { hash, err := s.cfg.Chain.BlockHashByHeight(curHeight) if err != nil { context := "Failed to fetch block hash" return nil, internalRPCError(err.Error(), context) } // Fetch the header from chain. header, err := s.cfg.Chain.HeaderByHash(hash) if err != nil { context := "Failed to fetch block header" return nil, internalRPCError(err.Error(), context) } if curHeight == startHeight { minTimestamp = header.Timestamp maxTimestamp = minTimestamp } else { totalWork.Add(totalWork, blockchain.CalcWork(header.Bits)) if minTimestamp.After(header.Timestamp) { minTimestamp = header.Timestamp } if maxTimestamp.Before(header.Timestamp) { maxTimestamp = header.Timestamp } } } // Calculate the difference in seconds between the min and max block // timestamps and avoid division by zero in the case where there is no // time difference. timeDiff := int64(maxTimestamp.Sub(minTimestamp) / time.Second) if timeDiff == 0 { return int64(0), nil } hashesPerSec := new(big.Int).Div(totalWork, big.NewInt(timeDiff)) return hashesPerSec.Int64(), nil } // handleGetNodeAddresses implements the getnodeaddresses command. func handleGetNodeAddresses(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.GetNodeAddressesCmd) count := int32(1) if c.Count != nil { count = *c.Count if count <= 0 { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidParameter, Message: "Address count out of range", } } } nodes := s.cfg.ConnMgr.NodeAddresses() if n := int32(len(nodes)); n < count { count = n } addresses := make([]*btcjson.GetNodeAddressesResult, 0, count) for _, node := range nodes[:count] { address := &btcjson.GetNodeAddressesResult{ Time: node.Timestamp.Unix(), Services: uint64(node.Services), Address: node.IP.String(), Port: node.Port, } addresses = append(addresses, address) } return addresses, nil } // handleGetPeerInfo implements the getpeerinfo command. func handleGetPeerInfo(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { peers := s.cfg.ConnMgr.ConnectedPeers() syncPeerID := s.cfg.SyncMgr.SyncPeerID() infos := make([]*btcjson.GetPeerInfoResult, 0, len(peers)) for _, p := range peers { statsSnap := p.ToPeer().StatsSnapshot() info := &btcjson.GetPeerInfoResult{ ID: statsSnap.ID, Addr: statsSnap.Addr, AddrLocal: p.ToPeer().LocalAddr().String(), Services: fmt.Sprintf("%08d", uint64(statsSnap.Services)), RelayTxes: !p.IsTxRelayDisabled(), LastSend: statsSnap.LastSend.Unix(), LastRecv: statsSnap.LastRecv.Unix(), BytesSent: statsSnap.BytesSent, BytesRecv: statsSnap.BytesRecv, ConnTime: statsSnap.ConnTime.Unix(), PingTime: float64(statsSnap.LastPingMicros), TimeOffset: statsSnap.TimeOffset, Version: statsSnap.Version, SubVer: statsSnap.UserAgent, Inbound: statsSnap.Inbound, StartingHeight: statsSnap.StartingHeight, CurrentHeight: statsSnap.LastBlock, BanScore: int32(p.BanScore()), FeeFilter: p.FeeFilter(), SyncNode: statsSnap.ID == syncPeerID, } if p.ToPeer().LastPingNonce() != 0 { wait := float64(time.Since(statsSnap.LastPingTime).Nanoseconds()) // We actually want microseconds. info.PingWait = wait / 1000 } infos = append(infos, info) } return infos, nil } // handleGetRawMempool implements the getrawmempool command. func handleGetRawMempool(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.GetRawMempoolCmd) mp := s.cfg.TxMemPool if c.Verbose != nil && *c.Verbose { return mp.RawMempoolVerbose(), nil } // The response is simply an array of the transaction hashes if the // verbose flag is not set. descs := mp.TxDescs() hashStrings := make([]string, len(descs)) for i := range hashStrings { hashStrings[i] = descs[i].Tx.Hash().String() } return hashStrings, nil } // handleGetRawTransaction implements the getrawtransaction command. func handleGetRawTransaction(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.GetRawTransactionCmd) // Convert the provided transaction hash hex to a Hash. txHash, err := chainhash.NewHashFromStr(c.Txid) if err != nil { return nil, rpcDecodeHexError(c.Txid) } verbose := false if c.Verbose != nil { verbose = *c.Verbose != 0 } // Try to fetch the transaction from the memory pool and if that fails, // try the block database. var mtx *wire.MsgTx var blkHash *chainhash.Hash var blkHeight int32 tx, err := s.cfg.TxMemPool.FetchTransaction(txHash) if err != nil { if s.cfg.TxIndex == nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCNoTxInfo, Message: "The transaction index must be " + "enabled to query the blockchain " + "(specify --txindex)", } } // Look up the location of the transaction. blockRegion, err := s.cfg.TxIndex.TxBlockRegion(txHash) if err != nil { context := "Failed to retrieve transaction location" return nil, internalRPCError(err.Error(), context) } if blockRegion == nil { return nil, rpcNoTxInfoError(txHash) } // Load the raw transaction bytes from the database. var txBytes []byte err = s.cfg.DB.View(func(dbTx database.Tx) error { var err error txBytes, err = dbTx.FetchBlockRegion(blockRegion) return err }) if err != nil { return nil, rpcNoTxInfoError(txHash) } // When the verbose flag isn't set, simply return the serialized // transaction as a hex-encoded string. This is done here to // avoid deserializing it only to reserialize it again later. if !verbose { return hex.EncodeToString(txBytes), nil } // Grab the block height. blkHash = blockRegion.Hash blkHeight, err = s.cfg.Chain.BlockHeightByHash(blkHash) if err != nil { context := "Failed to retrieve block height" return nil, internalRPCError(err.Error(), context) } // Deserialize the transaction var msgTx wire.MsgTx err = msgTx.Deserialize(bytes.NewReader(txBytes)) if err != nil { context := "Failed to deserialize transaction" return nil, internalRPCError(err.Error(), context) } mtx = &msgTx } else { // When the verbose flag isn't set, simply return the // network-serialized transaction as a hex-encoded string. if !verbose { // 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(tx.MsgTx()) if err != nil { return nil, err } return mtxHex, nil } mtx = tx.MsgTx() } // The verbose flag is set, so generate the JSON object and return it. var blkHeader *wire.BlockHeader var blkHashStr string var chainHeight int32 if blkHash != nil { // Fetch the header from chain. header, err := s.cfg.Chain.HeaderByHash(blkHash) if err != nil { context := "Failed to fetch block header" return nil, internalRPCError(err.Error(), context) } blkHeader = &header blkHashStr = blkHash.String() chainHeight = s.cfg.Chain.BestSnapshot().Height } rawTxn, err := createTxRawResult(s.cfg.ChainParams, mtx, txHash.String(), blkHeader, blkHashStr, blkHeight, chainHeight) if err != nil { return nil, err } return *rawTxn, nil } // handleGetTxOut handles gettxout commands. func handleGetTxOut(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.GetTxOutCmd) // Convert the provided transaction hash hex to a Hash. txHash, err := chainhash.NewHashFromStr(c.Txid) if err != nil { return nil, rpcDecodeHexError(c.Txid) } // If requested and the tx is available in the mempool try to fetch it // from there, otherwise attempt to fetch from the block database. var bestBlockHash string var confirmations int32 var value int64 var pkScript []byte var isCoinbase bool includeMempool := true if c.IncludeMempool != nil { includeMempool = *c.IncludeMempool } // TODO: This is racy. It should attempt to fetch it directly and check // the error. if includeMempool && s.cfg.TxMemPool.HaveTransaction(txHash) { tx, err := s.cfg.TxMemPool.FetchTransaction(txHash) if err != nil { return nil, rpcNoTxInfoError(txHash) } mtx := tx.MsgTx() if c.Vout > uint32(len(mtx.TxOut)-1) { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidTxVout, Message: "Output index number (vout) does not " + "exist for transaction.", } } txOut := mtx.TxOut[c.Vout] if txOut == nil { errStr := fmt.Sprintf("Output index: %d for txid: %s "+ "does not exist", c.Vout, txHash) return nil, internalRPCError(errStr, "") } best := s.cfg.Chain.BestSnapshot() bestBlockHash = best.Hash.String() confirmations = 0 value = txOut.Value pkScript = txOut.PkScript isCoinbase = blockchain.IsCoinBaseTx(mtx) } else { out := wire.OutPoint{Hash: *txHash, Index: c.Vout} entry, err := s.cfg.Chain.FetchUtxoEntry(out) if err != nil { return nil, rpcNoTxInfoError(txHash) } // To match the behavior of the reference client, return nil // (JSON null) if the transaction output is spent by another // transaction already in the main chain. Mined transactions // that are spent by a mempool transaction are not affected by // this. if entry == nil || entry.IsSpent() { return nil, nil } best := s.cfg.Chain.BestSnapshot() bestBlockHash = best.Hash.String() confirmations = 1 + best.Height - entry.BlockHeight() value = entry.Amount() pkScript = entry.PkScript() isCoinbase = entry.IsCoinBase() } // Disassemble script into single line printable format. // The disassembled string will contain [error] inline if the script // doesn't fully parse, so ignore the error here. disbuf, _ := txscript.DisasmString(pkScript) script := txscript.StripClaimScriptPrefix(pkScript) // Get further info about the script. // Ignore the error here since an error means the script couldn't parse // and there is no additional information about it anyways. scriptClass, addrs, reqSigs, _ := txscript.ExtractPkScriptAddrs(script, s.cfg.ChainParams) addresses := make([]string, len(addrs)) for i, addr := range addrs { addresses[i] = addr.EncodeAddress() } txOutReply := &btcjson.GetTxOutResult{ BestBlock: bestBlockHash, Confirmations: int64(confirmations), Value: btcutil.Amount(value).ToBTC(), ScriptPubKey: btcjson.ScriptPubKeyResult{ Asm: disbuf, Hex: hex.EncodeToString(pkScript), ReqSigs: int32(reqSigs), Addresses: addresses, }, Coinbase: isCoinbase, } if len(script) < len(pkScript) { txOutReply.ScriptPubKey.IsClaim = pkScript[0] == txscript.OP_CLAIMNAME || pkScript[0] == txscript.OP_UPDATECLAIM txOutReply.ScriptPubKey.IsSupport = pkScript[0] == txscript.OP_SUPPORTCLAIM txOutReply.ScriptPubKey.SubType = scriptClass.String() txOutReply.ScriptPubKey.Type = txscript.ScriptClass.String(0) } else { txOutReply.ScriptPubKey.Type = scriptClass.String() } return txOutReply, nil } // handleHelp implements the help command. func handleHelp(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.HelpCmd) // Provide a usage overview of all commands when no specific command // was specified. var command string if c.Command != nil { command = *c.Command } if command == "" { usage, err := s.helpCacher.rpcUsage(false) if err != nil { context := "Failed to generate RPC usage" return nil, internalRPCError(err.Error(), context) } return usage, nil } // Check that the command asked for is supported and implemented. Only // search the main list of handlers since help should not be provided // for commands that are unimplemented or related to wallet // functionality. if _, ok := rpcHandlers[command]; !ok { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidParameter, Message: "Unknown command: " + command, } } // Get the help for the command. help, err := s.helpCacher.rpcMethodHelp(command) if err != nil { context := "Failed to generate help" return nil, internalRPCError(err.Error(), context) } return help, nil } // handlePing implements the ping command. func handlePing(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { // Ask server to ping \o_ nonce, err := wire.RandomUint64() if err != nil { return nil, internalRPCError("Not sending ping - failed to "+ "generate nonce: "+err.Error(), "") } s.cfg.ConnMgr.BroadcastMessage(wire.NewMsgPing(nonce)) return nil, nil } // retrievedTx represents a transaction that was either loaded from the // transaction memory pool or from the database. When a transaction is loaded // from the database, it is loaded with the raw serialized bytes while the // mempool has the fully deserialized structure. This structure therefore will // have one of the two fields set depending on where is was retrieved from. // This is mainly done for efficiency to avoid extra serialization steps when // possible. type retrievedTx struct { txBytes []byte blkHash *chainhash.Hash // Only set when transaction is in a block. tx *btcutil.Tx } // fetchInputTxos fetches the outpoints from all transactions referenced by the // inputs to the passed transaction by checking the transaction mempool first // then the transaction index for those already mined into blocks. func fetchInputTxos(s *rpcServer, tx *wire.MsgTx) (map[wire.OutPoint]wire.TxOut, error) { mp := s.cfg.TxMemPool originOutputs := make(map[wire.OutPoint]wire.TxOut) for txInIndex, txIn := range tx.TxIn { // Attempt to fetch and use the referenced transaction from the // memory pool. origin := &txIn.PreviousOutPoint originTx, err := mp.FetchTransaction(&origin.Hash) if err == nil { txOuts := originTx.MsgTx().TxOut if origin.Index >= uint32(len(txOuts)) { errStr := fmt.Sprintf("unable to find output "+ "%v referenced from transaction %s:%d", origin, tx.TxHash(), txInIndex) return nil, internalRPCError(errStr, "") } originOutputs[*origin] = *txOuts[origin.Index] continue } // Look up the location of the transaction. blockRegion, err := s.cfg.TxIndex.TxBlockRegion(&origin.Hash) if err != nil { context := "Failed to retrieve transaction location" return nil, internalRPCError(err.Error(), context) } if blockRegion == nil { return nil, rpcNoTxInfoError(&origin.Hash) } // Load the raw transaction bytes from the database. var txBytes []byte err = s.cfg.DB.View(func(dbTx database.Tx) error { var err error txBytes, err = dbTx.FetchBlockRegion(blockRegion) return err }) if err != nil { return nil, rpcNoTxInfoError(&origin.Hash) } // Deserialize the transaction var msgTx wire.MsgTx err = msgTx.Deserialize(bytes.NewReader(txBytes)) if err != nil { context := "Failed to deserialize transaction" return nil, internalRPCError(err.Error(), context) } // Add the referenced output to the map. if origin.Index >= uint32(len(msgTx.TxOut)) { errStr := fmt.Sprintf("unable to find output %v "+ "referenced from transaction %s:%d", origin, tx.TxHash(), txInIndex) return nil, internalRPCError(errStr, "") } originOutputs[*origin] = *msgTx.TxOut[origin.Index] } return originOutputs, nil } // createVinListPrevOut returns a slice of JSON objects for the inputs of the // passed transaction. func createVinListPrevOut(s *rpcServer, mtx *wire.MsgTx, chainParams *chaincfg.Params, vinExtra bool, filterAddrMap map[string]struct{}) ([]btcjson.VinPrevOut, error) { // Coinbase transactions only have a single txin by definition. if blockchain.IsCoinBaseTx(mtx) { // Only include the transaction if the filter map is empty // because a coinbase input has no addresses and so would never // match a non-empty filter. if len(filterAddrMap) != 0 { return nil, nil } txIn := mtx.TxIn[0] vinList := make([]btcjson.VinPrevOut, 1) vinList[0].Coinbase = hex.EncodeToString(txIn.SignatureScript) vinList[0].Sequence = txIn.Sequence return vinList, nil } // Use a dynamically sized list to accommodate the address filter. vinList := make([]btcjson.VinPrevOut, 0, len(mtx.TxIn)) // Lookup all of the referenced transaction outputs needed to populate // the previous output information if requested. var originOutputs map[wire.OutPoint]wire.TxOut if vinExtra || len(filterAddrMap) > 0 { var err error originOutputs, err = fetchInputTxos(s, mtx) if err != nil { return nil, err } } for _, txIn := range mtx.TxIn { // The disassembled string will contain [error] inline // if the script doesn't fully parse, so ignore the // error here. disbuf, _ := txscript.DisasmString(txIn.SignatureScript) // Create the basic input entry without the additional optional // previous output details which will be added later if // requested and available. prevOut := &txIn.PreviousOutPoint vinEntry := btcjson.VinPrevOut{ Txid: prevOut.Hash.String(), Vout: prevOut.Index, Sequence: txIn.Sequence, ScriptSig: &btcjson.ScriptSig{ Asm: disbuf, Hex: hex.EncodeToString(txIn.SignatureScript), }, } if len(txIn.Witness) != 0 { vinEntry.Witness = witnessToHex(txIn.Witness) } // Add the entry to the list now if it already passed the filter // since the previous output might not be available. passesFilter := len(filterAddrMap) == 0 if passesFilter { vinList = append(vinList, vinEntry) } // Only populate previous output information if requested and // available. if len(originOutputs) == 0 { continue } originTxOut, ok := originOutputs[*prevOut] if !ok { continue } // Ignore the error here since an error means the script // couldn't parse and there is no additional information about // it anyways. class, addrs, _, _ := txscript.ExtractPkScriptAddrs( originTxOut.PkScript, chainParams) // Encode the addresses while checking if the address passes the // filter when needed. encodedAddrs := make([]string, len(addrs)) for j, addr := range addrs { encodedAddr := addr.EncodeAddress() encodedAddrs[j] = encodedAddr // No need to check the map again if the filter already // passes. if passesFilter { continue } if _, exists := filterAddrMap[encodedAddr]; exists { passesFilter = true } } // Ignore the entry if it doesn't pass the filter. if !passesFilter { continue } // Add entry to the list if it wasn't already done above. if len(filterAddrMap) != 0 { vinList = append(vinList, vinEntry) } // Update the entry with previous output information if // requested. if vinExtra { vinListEntry := &vinList[len(vinList)-1] vinListEntry.PrevOut = &btcjson.PrevOut{ Addresses: encodedAddrs, Value: btcutil.Amount(originTxOut.Value).ToBTC(), IsClaim: class == txscript.NonStandardTy && (originTxOut.PkScript[0] == txscript.OP_CLAIMNAME || originTxOut.PkScript[0] == txscript.OP_UPDATECLAIM), IsSupport: class == txscript.NonStandardTy && originTxOut.PkScript[0] == txscript.OP_SUPPORTCLAIM, } } } return vinList, nil } // fetchMempoolTxnsForAddress queries the address index for all unconfirmed // transactions that involve the provided address. The results will be limited // by the number to skip and the number requested. func fetchMempoolTxnsForAddress(s *rpcServer, addr btcutil.Address, numToSkip, numRequested uint32) ([]*btcutil.Tx, uint32) { // There are no entries to return when there are less available than the // number being skipped. mpTxns := s.cfg.AddrIndex.UnconfirmedTxnsForAddress(addr) numAvailable := uint32(len(mpTxns)) if numToSkip > numAvailable { return nil, numAvailable } // Filter the available entries based on the number to skip and number // requested. rangeEnd := numToSkip + numRequested if rangeEnd > numAvailable { rangeEnd = numAvailable } return mpTxns[numToSkip:rangeEnd], numToSkip } // handleSearchRawTransactions implements the searchrawtransactions command. func handleSearchRawTransactions(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { // Respond with an error if the address index is not enabled. addrIndex := s.cfg.AddrIndex if addrIndex == nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCMisc, Message: "Address index must be enabled (--addrindex)", } } // Override the flag for including extra previous output information in // each input if needed. c := cmd.(*btcjson.SearchRawTransactionsCmd) vinExtra := false if c.VinExtra != nil { vinExtra = *c.VinExtra != 0 } // Including the extra previous output information requires the // transaction index. Currently the address index relies on the // transaction index, so this check is redundant, but it's better to be // safe in case the address index is ever changed to not rely on it. if vinExtra && s.cfg.TxIndex == nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCMisc, Message: "Transaction index must be enabled (--txindex)", } } // Attempt to decode the supplied address. params := s.cfg.ChainParams addr, err := btcutil.DecodeAddress(c.Address, params) if err != nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidAddressOrKey, Message: "Invalid address or key: " + err.Error(), } } // Override the default number of requested entries if needed. Also, // just return now if the number of requested entries is zero to avoid // extra work. numRequested := 100 if c.Count != nil { numRequested = *c.Count if numRequested < 0 { numRequested = 1 } } if numRequested == 0 { return nil, nil } // Override the default number of entries to skip if needed. var numToSkip int if c.Skip != nil { numToSkip = *c.Skip if numToSkip < 0 { numToSkip = 0 } } // Override the reverse flag if needed. var reverse bool if c.Reverse != nil { reverse = *c.Reverse } // Add transactions from mempool first if client asked for reverse // order. Otherwise, they will be added last (as needed depending on // the requested counts). // // NOTE: This code doesn't sort by dependency. This might be something // to do in the future for the client's convenience, or leave it to the // client. numSkipped := uint32(0) addressTxns := make([]retrievedTx, 0, numRequested) if reverse { // Transactions in the mempool are not in a block header yet, // so the block header field in the retieved transaction struct // is left nil. mpTxns, mpSkipped := fetchMempoolTxnsForAddress(s, addr, uint32(numToSkip), uint32(numRequested)) numSkipped += mpSkipped for _, tx := range mpTxns { addressTxns = append(addressTxns, retrievedTx{tx: tx}) } } // Fetch transactions from the database in the desired order if more are // needed. if len(addressTxns) < numRequested { err = s.cfg.DB.View(func(dbTx database.Tx) error { regions, dbSkipped, err := addrIndex.TxRegionsForAddress( dbTx, addr, uint32(numToSkip)-numSkipped, uint32(numRequested-len(addressTxns)), reverse) if err != nil { return err } // Load the raw transaction bytes from the database. serializedTxns, err := dbTx.FetchBlockRegions(regions) if err != nil { return err } // Add the transaction and the hash of the block it is // contained in to the list. Note that the transaction // is left serialized here since the caller might have // requested non-verbose output and hence there would be // no point in deserializing it just to reserialize it // later. for i, serializedTx := range serializedTxns { addressTxns = append(addressTxns, retrievedTx{ txBytes: serializedTx, blkHash: regions[i].Hash, }) } numSkipped += dbSkipped return nil }) if err != nil { context := "Failed to load address index entries" return nil, internalRPCError(err.Error(), context) } } // Add transactions from mempool last if client did not request reverse // order and the number of results is still under the number requested. if !reverse && len(addressTxns) < numRequested { // Transactions in the mempool are not in a block header yet, // so the block header field in the retieved transaction struct // is left nil. mpTxns, mpSkipped := fetchMempoolTxnsForAddress(s, addr, uint32(numToSkip)-numSkipped, uint32(numRequested- len(addressTxns))) numSkipped += mpSkipped for _, tx := range mpTxns { addressTxns = append(addressTxns, retrievedTx{tx: tx}) } } // Address has never been used if neither source yielded any results. if len(addressTxns) == 0 { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCNoTxInfo, Message: "No information available about address", } } // Serialize all of the transactions to hex. hexTxns := make([]string, len(addressTxns)) for i := range addressTxns { // Simply encode the raw bytes to hex when the retrieved // transaction is already in serialized form. rtx := &addressTxns[i] if rtx.txBytes != nil { hexTxns[i] = hex.EncodeToString(rtx.txBytes) continue } // Serialize the transaction first and convert to hex when the // retrieved transaction is the deserialized structure. hexTxns[i], err = messageToHex(rtx.tx.MsgTx()) if err != nil { return nil, err } } // When not in verbose mode, simply return a list of serialized txns. if c.Verbose != nil && *c.Verbose == 0 { return hexTxns, nil } // Normalize the provided filter addresses (if any) to ensure there are // no duplicates. filterAddrMap := make(map[string]struct{}) if c.FilterAddrs != nil && len(*c.FilterAddrs) > 0 { for _, addr := range *c.FilterAddrs { filterAddrMap[addr] = struct{}{} } } // The verbose flag is set, so generate the JSON object and return it. best := s.cfg.Chain.BestSnapshot() srtList := make([]btcjson.SearchRawTransactionsResult, len(addressTxns)) for i := range addressTxns { // The deserialized transaction is needed, so deserialize the // retrieved transaction if it's in serialized form (which will // be the case when it was lookup up from the database). // Otherwise, use the existing deserialized transaction. rtx := &addressTxns[i] var mtx *wire.MsgTx if rtx.tx == nil { // Deserialize the transaction. mtx = new(wire.MsgTx) err := mtx.Deserialize(bytes.NewReader(rtx.txBytes)) if err != nil { context := "Failed to deserialize transaction" return nil, internalRPCError(err.Error(), context) } } else { mtx = rtx.tx.MsgTx() } result := &srtList[i] result.Hex = hexTxns[i] result.Txid = mtx.TxHash().String() result.Vin, err = createVinListPrevOut(s, mtx, params, vinExtra, filterAddrMap) if err != nil { return nil, err } result.Vout = createVoutList(mtx, params, filterAddrMap) result.Version = mtx.Version result.LockTime = mtx.LockTime // Transactions grabbed from the mempool aren't yet in a block, // so conditionally fetch block details here. This will be // reflected in the final JSON output (mempool won't have // confirmations or block information). var blkHeader *wire.BlockHeader var blkHashStr string var blkHeight int32 if blkHash := rtx.blkHash; blkHash != nil { // Fetch the header from chain. header, err := s.cfg.Chain.HeaderByHash(blkHash) if err != nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCBlockNotFound, Message: "Block not found", } } // Get the block height from chain. height, err := s.cfg.Chain.BlockHeightByHash(blkHash) if err != nil { context := "Failed to obtain block height" return nil, internalRPCError(err.Error(), context) } blkHeader = &header blkHashStr = blkHash.String() blkHeight = height } // Add the block information to the result if there is any. if blkHeader != nil { // This is not a typo, they are identical in Bitcoin // Core as well. result.Time = blkHeader.Timestamp.Unix() result.Blocktime = blkHeader.Timestamp.Unix() result.BlockHash = blkHashStr result.Confirmations = uint64(1 + best.Height - blkHeight) } } return srtList, nil } // handleSendRawTransaction implements the sendrawtransaction command. func handleSendRawTransaction(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.SendRawTransactionCmd) // Deserialize and send off to tx relay hexStr := c.HexTx if len(hexStr)%2 != 0 { hexStr = "0" + hexStr } serializedTx, err := hex.DecodeString(hexStr) if err != nil { return nil, rpcDecodeHexError(hexStr) } var msgTx wire.MsgTx err = msgTx.Deserialize(bytes.NewReader(serializedTx)) if err != nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCDeserialization, Message: "TX decode failed: " + err.Error(), } } // Use 0 for the tag to represent local node. tx := btcutil.NewTx(&msgTx) acceptedTxs, err := s.cfg.TxMemPool.ProcessTransaction(tx, false, false, 0) if err != nil { // When the error is a rule error, it means the transaction was // simply rejected as opposed to something actually going wrong, // so log it as such. Otherwise, something really did go wrong, // so log it as an actual error and return. ruleErr, ok := err.(mempool.RuleError) if !ok { rpcsLog.Errorf("Failed to process transaction %v: %v", tx.Hash(), err) return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCTxError, Message: "TX rejected: " + err.Error(), } } rpcsLog.Debugf("Rejected transaction %v: %v", tx.Hash(), err) // We'll then map the rule error to the appropriate RPC error, // matching bitcoind's behavior. code := btcjson.ErrRPCTxError if txRuleErr, ok := ruleErr.Err.(mempool.TxRuleError); ok { errDesc := txRuleErr.Description switch { case strings.Contains( strings.ToLower(errDesc), "orphan transaction", ): code = btcjson.ErrRPCTxError case strings.Contains( strings.ToLower(errDesc), "transaction already exists", ): code = btcjson.ErrRPCTxAlreadyInChain default: code = btcjson.ErrRPCTxRejected } } return nil, &btcjson.RPCError{ Code: code, Message: "TX rejected: " + err.Error(), } } // When the transaction was accepted it should be the first item in the // returned array of accepted transactions. The only way this will not // be true is if the API for ProcessTransaction changes and this code is // not properly updated, but ensure the condition holds as a safeguard. // // Also, since an error is being returned to the caller, ensure the // transaction is removed from the memory pool. if len(acceptedTxs) == 0 || !acceptedTxs[0].Tx.Hash().IsEqual(tx.Hash()) { s.cfg.TxMemPool.RemoveTransaction(tx, true) errStr := fmt.Sprintf("transaction %v is not in accepted list", tx.Hash()) return nil, internalRPCError(errStr, "") } // Generate and relay inventory vectors for all newly accepted // transactions into the memory pool due to the original being // accepted. s.cfg.ConnMgr.RelayTransactions(acceptedTxs) // Notify both websocket and getblocktemplate long poll clients of all // newly accepted transactions. s.NotifyNewTransactions(acceptedTxs) // Keep track of all the sendrawtransaction request txns so that they // can be rebroadcast if they don't make their way into a block. txD := acceptedTxs[0] iv := wire.NewInvVect(wire.InvTypeTx, txD.Tx.Hash()) s.cfg.ConnMgr.AddRebroadcastInventory(iv, txD) return tx.Hash().String(), nil } // handleSetGenerate implements the setgenerate command. func handleSetGenerate(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.SetGenerateCmd) // Disable generation regardless of the provided generate flag if the // maximum number of threads (goroutines for our purposes) is 0. // Otherwise enable or disable it depending on the provided flag. generate := c.Generate genProcLimit := -1 if c.GenProcLimit != nil { genProcLimit = *c.GenProcLimit } if genProcLimit == 0 { generate = false } if !generate { s.cfg.CPUMiner.Stop() } else { // Respond with an error if there are no addresses to pay the // created blocks to. if len(cfg.miningAddrs) == 0 { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInternal.Code, Message: "No payment addresses specified " + "via --miningaddr", } } // It's safe to call start even if it's already started. s.cfg.CPUMiner.SetNumWorkers(int32(genProcLimit)) s.cfg.CPUMiner.Start() } return nil, nil } // Text used to signify that a signed message follows and to prevent // inadvertently signing a transaction. const messageSignatureHeader = "Bitcoin Signed Message:\n" // handleSignMessageWithPrivKey implements the signmessagewithprivkey command. func handleSignMessageWithPrivKey(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.SignMessageWithPrivKeyCmd) wif, err := btcutil.DecodeWIF(c.PrivKey) if err != nil { message := "Invalid private key" switch err { case btcutil.ErrMalformedPrivateKey: message = "Malformed private key" case btcutil.ErrChecksumMismatch: message = "Private key checksum mismatch" } return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidAddressOrKey, Message: message, } } if !wif.IsForNet(s.cfg.ChainParams) { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidAddressOrKey, Message: "Private key for wrong network", } } var buf bytes.Buffer wire.WriteVarString(&buf, 0, messageSignatureHeader) wire.WriteVarString(&buf, 0, c.Message) messageHash := chainhash.DoubleHashB(buf.Bytes()) sig, err := btcec.SignCompact(btcec.S256(), wif.PrivKey, messageHash, wif.CompressPubKey) if err != nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidAddressOrKey, Message: "Sign failed", } } return base64.StdEncoding.EncodeToString(sig), nil } // handleStop implements the stop command. func handleStop(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { select { case s.requestProcessShutdown <- struct{}{}: default: } return "lbcd stopping.", nil } // handleSubmitBlock implements the submitblock command. func handleSubmitBlock(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.SubmitBlockCmd) // Deserialize the submitted block. hexStr := c.HexBlock if len(hexStr)%2 != 0 { hexStr = "0" + c.HexBlock } serializedBlock, err := hex.DecodeString(hexStr) if err != nil { return nil, rpcDecodeHexError(hexStr) } block, err := btcutil.NewBlockFromBytes(serializedBlock) if err != nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCDeserialization, Message: "Block decode failed: " + err.Error(), } } // Process this block using the same rules as blocks coming from other // nodes. This will in turn relay it to the network like normal. _, err = s.cfg.SyncMgr.SubmitBlock(block, blockchain.BFNone) if err != nil { return fmt.Sprintf("rejected: %s", err.Error()), nil } rpcsLog.Infof("Accepted block %s via submitblock", block.Hash()) return nil, nil } // handleUptime implements the uptime command. func handleUptime(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { return time.Now().Unix() - s.cfg.StartupTime, nil } // handleValidateAddress implements the validateaddress command. func handleValidateAddress(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.ValidateAddressCmd) result := btcjson.ValidateAddressChainResult{} addr, err := btcutil.DecodeAddress(c.Address, s.cfg.ChainParams) if err != nil { // Return the default value (false) for IsValid. return result, nil } switch addr := addr.(type) { case *btcutil.AddressPubKeyHash: result.IsScript = btcjson.Bool(false) result.IsWitness = btcjson.Bool(false) case *btcutil.AddressScriptHash: result.IsScript = btcjson.Bool(true) result.IsWitness = btcjson.Bool(false) case *btcutil.AddressPubKey: result.IsScript = btcjson.Bool(false) result.IsWitness = btcjson.Bool(false) case *btcutil.AddressWitnessPubKeyHash: result.IsScript = btcjson.Bool(false) result.IsWitness = btcjson.Bool(true) result.WitnessVersion = btcjson.Int32(int32(addr.WitnessVersion())) result.WitnessProgram = btcjson.String(hex.EncodeToString(addr.WitnessProgram())) case *btcutil.AddressWitnessScriptHash: result.IsScript = btcjson.Bool(true) result.IsWitness = btcjson.Bool(true) result.WitnessVersion = btcjson.Int32(int32(addr.WitnessVersion())) result.WitnessProgram = btcjson.String(hex.EncodeToString(addr.WitnessProgram())) default: // Handle the case when a new Address is supported by btcutil, but none // of the cases were matched in the switch block. The current behaviour // is to do nothing, and only populate the Address and IsValid fields. } result.Address = addr.EncodeAddress() result.IsValid = true return result, nil } func verifyChain(s *rpcServer, level, depth int32) error { best := s.cfg.Chain.BestSnapshot() finishHeight := best.Height - depth if finishHeight < 0 { finishHeight = 0 } rpcsLog.Infof("Verifying chain for %d blocks at level %d", best.Height-finishHeight, level) for height := best.Height; height > finishHeight; height-- { // Level 0 just looks up the block. block, err := s.cfg.Chain.BlockByHeight(height) if err != nil { rpcsLog.Errorf("Verify is unable to fetch block at "+ "height %d: %v", height, err) return err } // Level 1 does basic chain sanity checks. if level > 0 { err := blockchain.CheckBlockSanity(block, s.cfg.ChainParams.PowLimit, s.cfg.TimeSource) if err != nil { rpcsLog.Errorf("Verify is unable to validate "+ "block at hash %v height %d: %v", block.Hash(), height, err) return err } } } rpcsLog.Infof("Chain verify completed successfully") return nil } // handleVerifyChain implements the verifychain command. func handleVerifyChain(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.VerifyChainCmd) var checkLevel, checkDepth int32 if c.CheckLevel != nil { checkLevel = *c.CheckLevel } if c.CheckDepth != nil { checkDepth = *c.CheckDepth } err := verifyChain(s, checkLevel, checkDepth) return err == nil, nil } // handleVerifyMessage implements the verifymessage command. func handleVerifyMessage(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { c := cmd.(*btcjson.VerifyMessageCmd) // Decode the provided address. params := s.cfg.ChainParams addr, err := btcutil.DecodeAddress(c.Address, params) if err != nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidAddressOrKey, Message: "Invalid address or key: " + err.Error(), } } // Only P2PKH addresses are valid for signing. if _, ok := addr.(*btcutil.AddressPubKeyHash); !ok { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCType, Message: "Address is not a pay-to-pubkey-hash address", } } // Decode base64 signature. sig, err := base64.StdEncoding.DecodeString(c.Signature) if err != nil { return nil, &btcjson.RPCError{ Code: btcjson.ErrRPCParse.Code, Message: "Malformed base64 encoding: " + err.Error(), } } // Validate the signature - this just shows that it was valid at all. // we will compare it with the key next. var buf bytes.Buffer wire.WriteVarString(&buf, 0, messageSignatureHeader) wire.WriteVarString(&buf, 0, c.Message) expectedMessageHash := chainhash.DoubleHashB(buf.Bytes()) pk, wasCompressed, err := btcec.RecoverCompact(btcec.S256(), sig, expectedMessageHash) if err != nil { // Mirror Bitcoin Core behavior, which treats error in // RecoverCompact as invalid signature. return false, nil } // Reconstruct the pubkey hash. var serializedPK []byte if wasCompressed { serializedPK = pk.SerializeCompressed() } else { serializedPK = pk.SerializeUncompressed() } address, err := btcutil.NewAddressPubKey(serializedPK, params) if err != nil { // Again mirror Bitcoin Core behavior, which treats error in public key // reconstruction as invalid signature. return false, nil } // Return boolean if addresses match. return address.EncodeAddress() == c.Address, nil } // handleVersion implements the version command. // // NOTE: This is a btcsuite extension ported from github.com/decred/dcrd. func handleVersion(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) { result := map[string]btcjson.VersionResult{ "lbcdjsonrpcapi": { VersionString: jsonrpcSemverString, Major: jsonrpcSemverMajor, Minor: jsonrpcSemverMinor, Patch: jsonrpcSemverPatch, }, } return result, nil } // rpcServer provides a concurrent safe RPC server to a chain server. type rpcServer struct { started int32 shutdown int32 cfg rpcserverConfig authsha [sha256.Size]byte limitauthsha [sha256.Size]byte ntfnMgr *wsNotificationManager numClients int32 statusLines map[int]string statusLock sync.RWMutex wg sync.WaitGroup gbtWorkState *gbtWorkState helpCacher *helpCacher requestProcessShutdown chan struct{} quit chan int } // httpStatusLine returns a response Status-Line (RFC 2616 Section 6.1) // for the given request and response status code. This function was lifted and // adapted from the standard library HTTP server code since it's not exported. func (s *rpcServer) httpStatusLine(req *http.Request, code int) string { // Fast path: key := code proto11 := req.ProtoAtLeast(1, 1) if !proto11 { key = -key } s.statusLock.RLock() line, ok := s.statusLines[key] s.statusLock.RUnlock() if ok { return line } // Slow path: proto := "HTTP/1.0" if proto11 { proto = "HTTP/1.1" } codeStr := strconv.Itoa(code) text := http.StatusText(code) if text != "" { line = proto + " " + codeStr + " " + text + "\r\n" s.statusLock.Lock() s.statusLines[key] = line s.statusLock.Unlock() } else { text = "status code " + codeStr line = proto + " " + codeStr + " " + text + "\r\n" } return line } // writeHTTPResponseHeaders writes the necessary response headers prior to // writing an HTTP body given a request to use for protocol negotiation, headers // to write, a status code, and a writer. func (s *rpcServer) writeHTTPResponseHeaders(req *http.Request, headers http.Header, code int, w io.Writer) error { _, err := io.WriteString(w, s.httpStatusLine(req, code)) if err != nil { return err } err = headers.Write(w) if err != nil { return err } _, err = io.WriteString(w, "\r\n") return err } // Stop is used by server.go to stop the rpc listener. func (s *rpcServer) Stop() error { if atomic.AddInt32(&s.shutdown, 1) != 1 { rpcsLog.Infof("RPC server is already in the process of shutting down") return nil } rpcsLog.Warnf("RPC server shutting down") for _, listener := range s.cfg.Listeners { err := listener.Close() if err != nil { rpcsLog.Errorf("Problem shutting down rpc: %v", err) return err } } s.ntfnMgr.Shutdown() s.ntfnMgr.WaitForShutdown() close(s.quit) s.wg.Wait() rpcsLog.Infof("RPC server shutdown complete") return nil } // RequestedProcessShutdown returns a channel that is sent to when an authorized // RPC client requests the process to shutdown. If the request can not be read // immediately, it is dropped. func (s *rpcServer) RequestedProcessShutdown() <-chan struct{} { return s.requestProcessShutdown } // NotifyNewTransactions notifies both websocket and getblocktemplate long // poll clients of the passed transactions. This function should be called // whenever new transactions are added to the mempool. func (s *rpcServer) NotifyNewTransactions(txns []*mempool.TxDesc) { for _, txD := range txns { // Notify websocket clients about mempool transactions. s.ntfnMgr.NotifyMempoolTx(txD.Tx, true) // Potentially notify any getblocktemplate long poll clients // about stale block templates due to the new transaction. s.gbtWorkState.NotifyMempoolTx(s.cfg.TxMemPool.LastUpdated()) } } // limitConnections responds with a 503 service unavailable and returns true if // adding another client would exceed the maximum allow RPC clients. // // This function is safe for concurrent access. func (s *rpcServer) limitConnections(w http.ResponseWriter, remoteAddr string) bool { if int(atomic.LoadInt32(&s.numClients)+1) > cfg.RPCMaxClients { rpcsLog.Infof("Max RPC clients exceeded [%d] - "+ "disconnecting client %s", cfg.RPCMaxClients, remoteAddr) http.Error(w, "503 Too busy. Try again later.", http.StatusServiceUnavailable) return true } return false } // incrementClients adds one to the number of connected RPC clients. Note // this only applies to standard clients. Websocket clients have their own // limits and are tracked separately. // // This function is safe for concurrent access. func (s *rpcServer) incrementClients() { atomic.AddInt32(&s.numClients, 1) } // decrementClients subtracts one from the number of connected RPC clients. // Note this only applies to standard clients. Websocket clients have their own // limits and are tracked separately. // // This function is safe for concurrent access. func (s *rpcServer) decrementClients() { atomic.AddInt32(&s.numClients, -1) } // checkAuth checks the HTTP Basic authentication supplied by a wallet // or RPC client in the HTTP request r. If the supplied authentication // does not match the username and password expected, a non-nil error is // returned. // // This check is time-constant. // // The first bool return value signifies auth success (true if successful) and // the second bool return value specifies whether the user can change the state // of the server (true) or whether the user is limited (false). The second is // always false if the first is. func (s *rpcServer) checkAuth(r *http.Request, require bool) (bool, bool, error) { authhdr := r.Header["Authorization"] if len(authhdr) <= 0 { if require { rpcsLog.Warnf("RPC authentication failure from %s", r.RemoteAddr) return false, false, errors.New("auth failure") } return false, false, nil } authsha := sha256.Sum256([]byte(authhdr[0])) // Check for limited auth first as in environments with limited users, those // are probably expected to have a higher volume of calls limitcmp := subtle.ConstantTimeCompare(authsha[:], s.limitauthsha[:]) if limitcmp == 1 { return true, false, nil } // Check for admin-level auth cmp := subtle.ConstantTimeCompare(authsha[:], s.authsha[:]) if cmp == 1 { return true, true, nil } // Request's auth doesn't match either user rpcsLog.Warnf("RPC authentication failure from %s", r.RemoteAddr) return false, false, errors.New("auth failure") } // parsedRPCCmd represents a JSON-RPC request object that has been parsed into // a known concrete command along with any error that might have happened while // parsing it. type parsedRPCCmd struct { jsonrpc btcjson.RPCVersion id interface{} method string cmd interface{} err *btcjson.RPCError } // standardCmdResult checks that a parsed command is a standard Bitcoin JSON-RPC // command and runs the appropriate handler to reply to the command. Any // commands which are not recognized or not implemented will return an error // suitable for use in replies. func (s *rpcServer) standardCmdResult(cmd *parsedRPCCmd, closeChan <-chan struct{}) (interface{}, error) { handler, ok := rpcHandlers[cmd.method] if ok { goto handled } _, ok = rpcAskWallet[cmd.method] if ok { handler = handleAskWallet goto handled } _, ok = rpcUnimplemented[cmd.method] if ok { handler = handleUnimplemented goto handled } return nil, btcjson.ErrRPCMethodNotFound handled: return handler(s, cmd.cmd, closeChan) } // parseCmd parses a JSON-RPC request object into known concrete command. The // err field of the returned parsedRPCCmd struct will contain an RPC error that // is suitable for use in replies if the command is invalid in some way such as // an unregistered command or invalid parameters. func parseCmd(request *btcjson.Request) *parsedRPCCmd { parsedCmd := parsedRPCCmd{ jsonrpc: request.Jsonrpc, id: request.ID, method: request.Method, } cmd, err := btcjson.UnmarshalCmd(request) if err != nil { // When the error is because the method is not registered, // produce a method not found RPC error. if jerr, ok := err.(btcjson.Error); ok && jerr.ErrorCode == btcjson.ErrUnregisteredMethod { parsedCmd.err = btcjson.ErrRPCMethodNotFound return &parsedCmd } // Otherwise, some type of invalid parameters is the // cause, so produce the equivalent RPC error. parsedCmd.err = btcjson.NewRPCError( btcjson.ErrRPCInvalidParams.Code, err.Error()) return &parsedCmd } parsedCmd.cmd = cmd return &parsedCmd } // createMarshalledReply returns a new marshalled JSON-RPC response given the // passed parameters. It will automatically convert errors that are not of // the type *btcjson.RPCError to the appropriate type as needed. func createMarshalledReply(rpcVersion btcjson.RPCVersion, id interface{}, result interface{}, replyErr error) ([]byte, error) { var jsonErr *btcjson.RPCError if replyErr != nil { if jErr, ok := replyErr.(*btcjson.RPCError); ok { jsonErr = jErr } else { jsonErr = internalRPCError(replyErr.Error(), "") } } return btcjson.MarshalResponse(rpcVersion, id, result, jsonErr) } // processRequest determines the incoming request type (single or batched), // parses it and returns a marshalled response. func (s *rpcServer) processRequest(request *btcjson.Request, isAdmin bool, closeChan <-chan struct{}) []byte { var result interface{} var err error var jsonErr *btcjson.RPCError if !isAdmin { if _, ok := rpcLimited[request.Method]; !ok { jsonErr = internalRPCError("limited user not "+ "authorized for this method", "") } } if jsonErr == nil { if request.Method == "" || request.Params == nil { jsonErr = &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidRequest.Code, Message: "Invalid request: malformed", } msg, err := createMarshalledReply(request.Jsonrpc, request.ID, result, jsonErr) if err != nil { rpcsLog.Errorf("Failed to marshal reply: %v", err) return nil } return msg } // Valid requests with no ID (notifications) must not have a response // per the JSON-RPC spec. if request.ID == nil { return nil } // Attempt to parse the JSON-RPC request into a known // concrete command. parsedCmd := parseCmd(request) if parsedCmd.err != nil { jsonErr = parsedCmd.err } else { result, err = s.standardCmdResult(parsedCmd, closeChan) if err != nil { if rpcErr, ok := err.(*btcjson.RPCError); ok { jsonErr = rpcErr } else { jsonErr = &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidRequest.Code, Message: "Invalid request: malformed", } } } } } // Marshal the response. msg, err := createMarshalledReply(request.Jsonrpc, request.ID, result, jsonErr) if err != nil { rpcsLog.Errorf("Failed to marshal reply: %v", err) return nil } return msg } // jsonRPCRead handles reading and responding to RPC messages. func (s *rpcServer) jsonRPCRead(w http.ResponseWriter, r *http.Request, isAdmin bool) { if atomic.LoadInt32(&s.shutdown) != 0 { return } // Read and close the JSON-RPC request body from the caller. body, err := ioutil.ReadAll(r.Body) r.Body.Close() if err != nil { errCode := http.StatusBadRequest http.Error(w, fmt.Sprintf("%d error reading JSON message: %v", errCode, err), errCode) return } // Unfortunately, the http server doesn't provide the ability to // change the read deadline for the new connection and having one breaks // long polling. However, not having a read deadline on the initial // connection would mean clients can connect and idle forever. Thus, // hijack the connecton from the HTTP server, clear the read deadline, // and handle writing the response manually. hj, ok := w.(http.Hijacker) if !ok { errMsg := "webserver doesn't support hijacking" rpcsLog.Warnf(errMsg) errCode := http.StatusInternalServerError http.Error(w, strconv.Itoa(errCode)+" "+errMsg, errCode) return } conn, buf, err := hj.Hijack() if err != nil { rpcsLog.Warnf("Failed to hijack HTTP connection: %v", err) errCode := http.StatusInternalServerError http.Error(w, strconv.Itoa(errCode)+" "+err.Error(), errCode) return } defer conn.Close() defer buf.Flush() conn.SetReadDeadline(timeZeroVal) // Attempt to parse the raw body into a JSON-RPC request. // Setup a close notifier. Since the connection is hijacked, // the CloseNotifer on the ResponseWriter is not available. closeChan := make(chan struct{}, 1) go func() { _, err = conn.Read(make([]byte, 1)) if err != nil { close(closeChan) } }() var results []json.RawMessage var batchSize int var batchedRequest bool // Determine request type if bytes.HasPrefix(body, batchedRequestPrefix) { batchedRequest = true } // Process a single request if !batchedRequest { var req btcjson.Request var resp json.RawMessage err = json.Unmarshal(body, &req) if err != nil { jsonErr := &btcjson.RPCError{ Code: btcjson.ErrRPCParse.Code, Message: fmt.Sprintf("Failed to parse request: %v", err), } resp, err = btcjson.MarshalResponse(btcjson.RpcVersion1, nil, nil, jsonErr) if err != nil { rpcsLog.Errorf("Failed to create reply: %v", err) } } if err == nil { // The JSON-RPC 1.0 spec defines that notifications must have their "id" // set to null and states that notifications do not have a response. // // A JSON-RPC 2.0 notification is a request with "json-rpc":"2.0", and // without an "id" member. The specification states that notifications // must not be responded to. JSON-RPC 2.0 permits the null value as a // valid request id, therefore such requests are not notifications. // // Bitcoin Core serves requests with "id":null or even an absent "id", // and responds to such requests with "id":null in the response. // // Btcd does not respond to any request without and "id" or "id":null, // regardless the indicated JSON-RPC protocol version unless RPC quirks // are enabled. With RPC quirks enabled, such requests will be responded // to if the reqeust does not indicate JSON-RPC version. // // RPC quirks can be enabled by the user to avoid compatibility issues // with software relying on Core's behavior. if req.ID == nil && !(cfg.RPCQuirks && req.Jsonrpc == "") { return } resp = s.processRequest(&req, isAdmin, closeChan) } if resp != nil { results = append(results, resp) } } // Process a batched request if batchedRequest { var batchedRequests []interface{} var resp json.RawMessage err = json.Unmarshal(body, &batchedRequests) if err != nil { jsonErr := &btcjson.RPCError{ Code: btcjson.ErrRPCParse.Code, Message: fmt.Sprintf("Failed to parse request: %v", err), } resp, err = btcjson.MarshalResponse(btcjson.RpcVersion2, nil, nil, jsonErr) if err != nil { rpcsLog.Errorf("Failed to create reply: %v", err) } if resp != nil { results = append(results, resp) } } if err == nil { // Response with an empty batch error if the batch size is zero if len(batchedRequests) == 0 { jsonErr := &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidRequest.Code, Message: "Invalid request: empty batch", } resp, err = btcjson.MarshalResponse(btcjson.RpcVersion2, nil, nil, jsonErr) if err != nil { rpcsLog.Errorf("Failed to marshal reply: %v", err) } if resp != nil { results = append(results, resp) } } // Process each batch entry individually if len(batchedRequests) > 0 { batchSize = len(batchedRequests) for _, entry := range batchedRequests { var reqBytes []byte reqBytes, err = json.Marshal(entry) if err != nil { jsonErr := &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidRequest.Code, Message: fmt.Sprintf("Invalid request: %v", err), } resp, err = btcjson.MarshalResponse(btcjson.RpcVersion2, nil, nil, jsonErr) if err != nil { rpcsLog.Errorf("Failed to create reply: %v", err) } if resp != nil { results = append(results, resp) } continue } var req btcjson.Request err := json.Unmarshal(reqBytes, &req) if err != nil { jsonErr := &btcjson.RPCError{ Code: btcjson.ErrRPCInvalidRequest.Code, Message: fmt.Sprintf("Invalid request: %v", err), } resp, err = btcjson.MarshalResponse("", nil, nil, jsonErr) if err != nil { rpcsLog.Errorf("Failed to create reply: %v", err) } if resp != nil { results = append(results, resp) } continue } resp = s.processRequest(&req, isAdmin, closeChan) if resp != nil { results = append(results, resp) } } } } } var msg = []byte{} if batchedRequest && batchSize > 0 { if len(results) > 0 { // Form the batched response json var buffer bytes.Buffer buffer.WriteByte('[') for idx, reply := range results { if idx == len(results)-1 { buffer.Write(reply) buffer.WriteByte(']') break } buffer.Write(reply) buffer.WriteByte(',') } msg = buffer.Bytes() } } if !batchedRequest || batchSize == 0 { // Respond with the first results entry for single requests if len(results) > 0 { msg = results[0] } } // Write the response. err = s.writeHTTPResponseHeaders(r, w.Header(), http.StatusOK, buf) if err != nil { rpcsLog.Error(err) return } if _, err := buf.Write(msg); err != nil { rpcsLog.Errorf("Failed to write marshalled reply: %v", err) } // Terminate with newline to maintain compatibility with Bitcoin Core. if err := buf.WriteByte('\n'); err != nil { rpcsLog.Errorf("Failed to append terminating newline to reply: %v", err) } } // jsonAuthFail sends a message back to the client if the http auth is rejected. func jsonAuthFail(w http.ResponseWriter) { w.Header().Add("WWW-Authenticate", `Basic realm="lbcd RPC"`) http.Error(w, "401 Unauthorized.", http.StatusUnauthorized) } // Start is used by server.go to start the rpc listener. func (s *rpcServer) Start() { if atomic.AddInt32(&s.started, 1) != 1 { return } rpcsLog.Trace("Starting RPC server") rpcServeMux := http.NewServeMux() httpServer := &http.Server{ Handler: rpcServeMux, // Timeout connections which don't complete the initial // handshake within the allowed timeframe. ReadTimeout: time.Second * rpcAuthTimeoutSeconds, } rpcServeMux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { w.Header().Set("Connection", "close") w.Header().Set("Content-Type", "application/json") r.Close = true // Limit the number of connections to max allowed. if s.limitConnections(w, r.RemoteAddr) { return } // Keep track of the number of connected clients. s.incrementClients() defer s.decrementClients() _, isAdmin, err := s.checkAuth(r, true) if err != nil { jsonAuthFail(w) return } // Read and respond to the request. s.jsonRPCRead(w, r, isAdmin) }) // Websocket endpoint. rpcServeMux.HandleFunc("/ws", func(w http.ResponseWriter, r *http.Request) { authenticated, isAdmin, err := s.checkAuth(r, false) if err != nil { jsonAuthFail(w) return } // Attempt to upgrade the connection to a websocket connection // using the default size for read/write buffers. ws, err := websocket.Upgrade(w, r, nil, 0, 0) if err != nil { if _, ok := err.(websocket.HandshakeError); !ok { rpcsLog.Errorf("Unexpected websocket error: %v", err) } http.Error(w, "400 Bad Request.", http.StatusBadRequest) return } s.WebsocketHandler(ws, r.RemoteAddr, authenticated, isAdmin) }) for _, listener := range s.cfg.Listeners { s.wg.Add(1) go func(listener net.Listener) { rpcsLog.Infof("RPC server listening on %s", listener.Addr()) httpServer.Serve(listener) rpcsLog.Tracef("RPC listener done for %s", listener.Addr()) s.wg.Done() }(listener) } s.ntfnMgr.Start() } // genCertPair generates a key/cert pair to the paths provided. func genCertPair(certFile, keyFile string) error { rpcsLog.Infof("Generating TLS certificates...") org := "lbcd autogenerated cert" validUntil := time.Now().Add(10 * 365 * 24 * time.Hour) cert, key, err := btcutil.NewTLSCertPair(org, validUntil, nil) if err != nil { return err } // Write cert and key files. if err = ioutil.WriteFile(certFile, cert, 0666); err != nil { return err } if err = ioutil.WriteFile(keyFile, key, 0600); err != nil { os.Remove(certFile) return err } rpcsLog.Infof("Done generating TLS certificates") return nil } // rpcserverPeer represents a peer for use with the RPC server. // // The interface contract requires that all of these methods are safe for // concurrent access. type rpcserverPeer interface { // ToPeer returns the underlying peer instance. ToPeer() *peer.Peer // IsTxRelayDisabled returns whether or not the peer has disabled // transaction relay. IsTxRelayDisabled() bool // BanScore returns the current integer value that represents how close // the peer is to being banned. BanScore() uint32 // FeeFilter returns the requested current minimum fee rate for which // transactions should be announced. FeeFilter() int64 } // rpcserverConnManager represents a connection manager for use with the RPC // server. // // The interface contract requires that all of these methods are safe for // concurrent access. type rpcserverConnManager interface { // Connect adds the provided address as a new outbound peer. The // permanent flag indicates whether or not to make the peer persistent // and reconnect if the connection is lost. Attempting to connect to an // already existing peer will return an error. Connect(addr string, permanent bool) error // RemoveByID removes the peer associated with the provided id from the // list of persistent peers. Attempting to remove an id that does not // exist will return an error. RemoveByID(id int32) error // RemoveByAddr removes the peer associated with the provided address // from the list of persistent peers. Attempting to remove an address // that does not exist will return an error. RemoveByAddr(addr string) error // DisconnectByID disconnects the peer associated with the provided id. // This applies to both inbound and outbound peers. Attempting to // remove an id that does not exist will return an error. DisconnectByID(id int32) error // DisconnectByAddr disconnects the peer associated with the provided // address. This applies to both inbound and outbound peers. // Attempting to remove an address that does not exist will return an // error. DisconnectByAddr(addr string) error // ConnectedCount returns the number of currently connected peers. ConnectedCount() int32 // NetTotals returns the sum of all bytes received and sent across the // network for all peers. NetTotals() (uint64, uint64) // ConnectedPeers returns an array consisting of all connected peers. ConnectedPeers() []rpcserverPeer // PersistentPeers returns an array consisting of all the persistent // peers. PersistentPeers() []rpcserverPeer // BroadcastMessage sends the provided message to all currently // connected peers. BroadcastMessage(msg wire.Message) // AddRebroadcastInventory adds the provided inventory to the list of // inventories to be rebroadcast at random intervals until they show up // in a block. AddRebroadcastInventory(iv *wire.InvVect, data interface{}) // RelayTransactions generates and relays inventory vectors for all of // the passed transactions to all connected peers. RelayTransactions(txns []*mempool.TxDesc) // NodeAddresses returns an array consisting node addresses which can // potentially be used to find new nodes in the network. NodeAddresses() []*wire.NetAddress } // rpcserverSyncManager represents a sync manager for use with the RPC server. // // The interface contract requires that all of these methods are safe for // concurrent access. type rpcserverSyncManager interface { // IsCurrent returns whether or not the sync manager believes the chain // is current as compared to the rest of the network. IsCurrent() bool // SubmitBlock submits the provided block to the network after // processing it locally. SubmitBlock(block *btcutil.Block, flags blockchain.BehaviorFlags) (bool, error) // Pause pauses the sync manager until the returned channel is closed. Pause() chan<- struct{} // SyncPeerID returns the ID of the peer that is currently the peer being // used to sync from or 0 if there is none. SyncPeerID() int32 // LocateHeaders returns the headers of the blocks after the first known // block in the provided locators until the provided stop hash or the // current tip is reached, up to a max of wire.MaxBlockHeadersPerMsg // hashes. LocateHeaders(locators []*chainhash.Hash, hashStop *chainhash.Hash) []wire.BlockHeader } // rpcserverConfig is a descriptor containing the RPC server configuration. type rpcserverConfig struct { // Listeners defines a slice of listeners for which the RPC server will // take ownership of and accept connections. Since the RPC server takes // ownership of these listeners, they will be closed when the RPC server // is stopped. Listeners []net.Listener // StartupTime is the unix timestamp for when the server that is hosting // the RPC server started. StartupTime int64 // ConnMgr defines the connection manager for the RPC server to use. It // provides the RPC server with a means to do things such as add, // remove, connect, disconnect, and query peers as well as other // connection-related data and tasks. ConnMgr rpcserverConnManager // SyncMgr defines the sync manager for the RPC server to use. SyncMgr rpcserverSyncManager // These fields allow the RPC server to interface with the local block // chain data and state. TimeSource blockchain.MedianTimeSource Chain *blockchain.BlockChain ChainParams *chaincfg.Params DB database.DB // TxMemPool defines the transaction memory pool to interact with. TxMemPool *mempool.TxPool // These fields allow the RPC server to interface with mining. // // Generator produces block templates and the CPUMiner solves them using // the CPU. CPU mining is typically only useful for test purposes when // doing regression or simulation testing. Generator *mining.BlkTmplGenerator CPUMiner *cpuminer.CPUMiner // These fields define any optional indexes the RPC server can make use // of to provide additional data when queried. TxIndex *indexers.TxIndex AddrIndex *indexers.AddrIndex CfIndex *indexers.CfIndex // The fee estimator keeps track of how long transactions are left in // the mempool before they are mined into blocks. FeeEstimator *mempool.FeeEstimator } // newRPCServer returns a new instance of the rpcServer struct. func newRPCServer(config *rpcserverConfig) (*rpcServer, error) { rpc := rpcServer{ cfg: *config, statusLines: make(map[int]string), gbtWorkState: newGbtWorkState(config.TimeSource), helpCacher: newHelpCacher(), requestProcessShutdown: make(chan struct{}), quit: make(chan int), } if cfg.RPCUser != "" && cfg.RPCPass != "" { login := cfg.RPCUser + ":" + cfg.RPCPass auth := "Basic " + base64.StdEncoding.EncodeToString([]byte(login)) rpc.authsha = sha256.Sum256([]byte(auth)) } if cfg.RPCLimitUser != "" && cfg.RPCLimitPass != "" { login := cfg.RPCLimitUser + ":" + cfg.RPCLimitPass auth := "Basic " + base64.StdEncoding.EncodeToString([]byte(login)) rpc.limitauthsha = sha256.Sum256([]byte(auth)) } rpc.ntfnMgr = newWsNotificationManager(&rpc) rpc.cfg.Chain.Subscribe(rpc.handleBlockchainNotification) return &rpc, nil } // Callback for notifications from blockchain. It notifies clients that are // long polling for changes or subscribed to websockets notifications. func (s *rpcServer) handleBlockchainNotification(notification *blockchain.Notification) { switch notification.Type { case blockchain.NTBlockAccepted: block, ok := notification.Data.(*btcutil.Block) if !ok { rpcsLog.Warnf("Chain accepted notification is not a block.") break } // Allow any clients performing long polling via the // getblocktemplate RPC to be notified when the new block causes // their old block template to become stale. s.gbtWorkState.NotifyBlockConnected(block.Hash()) case blockchain.NTBlockConnected: block, ok := notification.Data.(*btcutil.Block) if !ok { rpcsLog.Warnf("Chain connected notification is not a block.") break } // Notify registered websocket clients of incoming block. s.ntfnMgr.NotifyBlockConnected(block) case blockchain.NTBlockDisconnected: block, ok := notification.Data.(*btcutil.Block) if !ok { rpcsLog.Warnf("Chain disconnected notification is not a block.") break } // Notify registered websocket clients. s.ntfnMgr.NotifyBlockDisconnected(block) } } func init() { rpcHandlers = rpcHandlersBeforeInit for key := range claimtrieHandlers { rpcHandlers[key] = claimtrieHandlers[key] } rand.Seed(time.Now().UnixNano()) }