add shell spv testing mode

To try uspv, do ./lnd -spv
The remote node is hardcoded in shell.go.  If you aren't
running a full node on localhost, specify where to connect to.
Nearby nodes will be much faster but random testnet nodes on the
internet should also work.

.gitignore

@@ -37,3 +37,7 @@ test_wal/*
 
 # vim
 **.swp
+
+*.hex
+*.db
+*.bin

cmd/lnshell/commands.go

@@ -22,8 +22,8 @@ func RpcConnect(args []string) error {
 	}
 	fmt.Printf("connection state: %s\n", state.String())
 	time.Sleep(time.Second * 2)
-	//	lnClient := lnrpc.NewLightningClient(conn)
-	//	lnClient.NewAddress(nil, nil, nil) // crashes
+	// lnClient := lnrpc.NewLightningClient(conn)
+	// lnClient.NewAddress(nil, nil, nil) // crashes
 
 	state, err = conn.State()
 	if err != nil {

lnd.go

@@ -21,11 +21,17 @@ var (
 	rpcPort  = flag.Int("rpcport", 10009, "The port for the rpc server")
 	peerPort = flag.String("peerport", "10011", "The port to listen on for incoming p2p connections")
 	dataDir  = flag.String("datadir", "test_wal", "The directory to store lnd's data within")
+	spvMode  = flag.Bool("spv", false, "assert to enter spv wallet mode")
 )
 
 func main() {
 	flag.Parse()
 
+	if *spvMode == true {
+		shell()
+		return
+	}
+
 	go func() {
 		listenAddr := net.JoinHostPort("", "5009")
 		profileRedirect := http.RedirectHandler("/debug/pprof",

shell.go

@@ -0,0 +1,328 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+
+	"github.com/btcsuite/btcd/txscript"
+	"github.com/btcsuite/btcd/wire"
+
+	"github.com/btcsuite/btcd/chaincfg"
+	"github.com/btcsuite/btcutil"
+
+	"github.com/lightningnetwork/lnd/uspv"
+)
+
+/* this is a CLI shell for testing out LND.  Right now it's only for uspv
+testing.  It can send and receive coins.
+*/
+
+const (
+	keyFileName    = "testkey.hex"
+	headerFileName = "headers.bin"
+	dbFileName     = "utxo.db"
+	// this is my local testnet node, replace it with your own close by.
+	// Random internet testnet nodes usually work but sometimes don't, so
+	// maybe I should test against different versions out there.
+	SPVHostAdr = "127.0.0.1:18333"
+)
+
+var (
+	Params = &chaincfg.TestNet3Params
+	SCon   uspv.SPVCon // global here for now
+)
+
+func shell() {
+	fmt.Printf("LND spv shell v0.0\n")
+	fmt.Printf("Not yet well integrated, but soon.\n")
+
+	// read key file (generate if not found)
+	rootPriv, err := uspv.ReadKeyFileToECPriv(keyFileName, Params)
+	if err != nil {
+		log.Fatal(err)
+	}
+	// setup TxStore first (before spvcon)
+	Store := uspv.NewTxStore(rootPriv, Params)
+	// setup spvCon
+
+	SCon, err = uspv.OpenSPV(
+		SPVHostAdr, headerFileName, dbFileName, &Store, Params)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	tip, err := SCon.TS.GetDBSyncHeight() // ask for sync height
+	if err != nil {
+		log.Fatal(err)
+	}
+	if tip == 0 { // DB has never been used, set to birthday
+		tip = 675000 // hardcoded; later base on keyfile date?
+		err = SCon.TS.SetDBSyncHeight(tip)
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+
+	// once we're connected, initiate headers sync
+	err = Hdr()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// main shell loop
+	for {
+		// setup reader with max 4K input chars
+		reader := bufio.NewReaderSize(os.Stdin, 4000)
+		fmt.Printf("LND# ")                 // prompt
+		msg, err := reader.ReadString('\n') // input finishes on enter key
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		cmdslice := strings.Fields(msg) // chop input up on whitespace
+		if len(cmdslice) < 1 {
+			continue // no input, just prompt again
+		}
+		fmt.Printf("entered command: %s\n", msg) // immediate feedback
+		err = Shellparse(cmdslice)
+		if err != nil { // only error should be user exit
+			log.Fatal(err)
+		}
+	}
+	return
+}
+
+// Shellparse parses user input and hands it to command functions if matching
+func Shellparse(cmdslice []string) error {
+	var err error
+	var args []string
+	cmd := cmdslice[0]
+	if len(cmdslice) > 1 {
+		args = cmdslice[1:]
+	}
+	if cmd == "exit" || cmd == "quit" {
+		return fmt.Errorf("User exit")
+	}
+
+	// help gives you really terse help.  Just a list of commands.
+	if cmd == "help" {
+		err = Help(args)
+		if err != nil {
+			fmt.Printf("help error: %s\n", err)
+		}
+		return nil
+	}
+
+	// adr generates a new address and displays it
+	if cmd == "adr" {
+		err = Adr(args)
+		if err != nil {
+			fmt.Printf("adr error: %s\n", err)
+		}
+		return nil
+	}
+
+	// bal shows the current set of utxos, addresses and score
+	if cmd == "bal" {
+		err = Bal(args)
+		if err != nil {
+			fmt.Printf("bal error: %s\n", err)
+		}
+		return nil
+	}
+
+	// send sends coins to the address specified
+	if cmd == "send" {
+		err = Send(args)
+		if err != nil {
+			fmt.Printf("send error: %s\n", err)
+		}
+		return nil
+	}
+
+	fmt.Printf("Command not recognized. type help for command list.\n")
+	return nil
+}
+
+// Hdr asks for headers.
+func Hdr() error {
+	if SCon.RBytes == 0 {
+		return fmt.Errorf("No SPV connection, can't get headers.")
+	}
+	err := SCon.AskForHeaders()
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// Bal prints out your score.
+func Bal(args []string) error {
+	if SCon.TS == nil {
+		return fmt.Errorf("Can't get balance, spv connection broken")
+	}
+	fmt.Printf(" ----- Account Balance ----- \n")
+	allUtxos, err := SCon.TS.GetAllUtxos()
+	if err != nil {
+		return err
+	}
+	var score int64
+	for i, u := range allUtxos {
+		fmt.Printf("\tutxo %d height %d %s key: %d amt %d\n",
+			i, u.AtHeight, u.Op.String(), u.KeyIdx, u.Value)
+		score += u.Value
+	}
+	height, _ := SCon.TS.GetDBSyncHeight()
+
+	for i, a := range SCon.TS.Adrs {
+		fmt.Printf("address %d %s\n", i, a.PkhAdr.String())
+	}
+	fmt.Printf("Total known utxos: %d\n", len(allUtxos))
+	fmt.Printf("Total spendable coin: %d\n", score)
+	fmt.Printf("DB sync height: %d\n", height)
+	return nil
+}
+
+// Adr makes a new address.
+func Adr(args []string) error {
+	a, err := SCon.TS.NewAdr()
+	if err != nil {
+		return err
+	}
+	fmt.Printf("made new address %s, %d addresses total\n",
+		a.String(), len(SCon.TS.Adrs))
+
+	return nil
+}
+
+// Send sends coins.
+func Send(args []string) error {
+	// get all utxos from the database
+	allUtxos, err := SCon.TS.GetAllUtxos()
+	if err != nil {
+		return err
+	}
+	var score int64 // score is the sum of all utxo amounts.  highest score wins.
+	// add all the utxos up to get the score
+	for _, u := range allUtxos {
+		score += u.Value
+	}
+
+	// score is 0, cannot unlock 'send coins' acheivement
+	if score == 0 {
+		return fmt.Errorf("You don't have money.  Work hard.")
+	}
+	// need args, fail
+	if len(args) < 2 {
+		return fmt.Errorf("need args: ssend amount(satoshis) address")
+	}
+	amt, err := strconv.ParseInt(args[0], 10, 64)
+	if err != nil {
+		return err
+	}
+	if amt < 1000 {
+		return fmt.Errorf("can't send %d, too small", amt)
+	}
+	adr, err := btcutil.DecodeAddress(args[1], SCon.TS.Param)
+	if err != nil {
+		fmt.Printf("error parsing %s as address\t", args[1])
+		return err
+	}
+	fmt.Printf("send %d to address: %s \n",
+		amt, adr.String())
+	err = SendCoins(SCon, adr, amt)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// SendCoins does send coins, but it's very rudimentary
+func SendCoins(s uspv.SPVCon, adr btcutil.Address, sendAmt int64) error {
+	var err error
+	var score int64
+	allUtxos, err := s.TS.GetAllUtxos()
+	if err != nil {
+		return err
+	}
+
+	for _, utxo := range allUtxos {
+		score += utxo.Value
+	}
+	// important rule in bitcoin, output total > input total is invalid.
+	if sendAmt > score {
+		return fmt.Errorf("trying to send %d but %d available.",
+			sendAmt, score)
+	}
+
+	tx := wire.NewMsgTx() // make new tx
+	// make address script 76a914...88ac
+	adrScript, err := txscript.PayToAddrScript(adr)
+	if err != nil {
+		return err
+	}
+	// make user specified txout and add to tx
+	txout := wire.NewTxOut(sendAmt, adrScript)
+	tx.AddTxOut(txout)
+
+	nokori := sendAmt // nokori is how much is needed on input side
+	for _, utxo := range allUtxos {
+		// generate pkscript to sign
+		prevPKscript, err := txscript.PayToAddrScript(
+			s.TS.Adrs[utxo.KeyIdx].PkhAdr)
+		if err != nil {
+			return err
+		}
+		// make new input from this utxo
+		thisInput := wire.NewTxIn(&utxo.Op, prevPKscript)
+		tx.AddTxIn(thisInput)
+		nokori -= utxo.Value
+		if nokori < -10000 { // minimum overage / fee is 1K now
+			break
+		}
+	}
+	// there's enough left to make a change output
+	if nokori < -200000 {
+		change, err := s.TS.NewAdr()
+		if err != nil {
+			return err
+		}
+
+		changeScript, err := txscript.PayToAddrScript(change)
+		if err != nil {
+			return err
+		}
+		changeOut := wire.NewTxOut((-100000)-nokori, changeScript)
+		tx.AddTxOut(changeOut)
+	}
+
+	// use txstore method to sign
+	err = s.TS.SignThis(tx)
+	if err != nil {
+		return err
+	}
+
+	fmt.Printf("tx: %s", uspv.TxToString(tx))
+	buf := bytes.NewBuffer(make([]byte, 0, tx.SerializeSize()))
+	tx.Serialize(buf)
+	fmt.Printf("tx: %x\n", buf.Bytes())
+
+	// send it out on the wire.  hope it gets there.
+	// we should deal with rejects.  Don't yet.
+	err = s.PushTx(tx)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func Help(args []string) error {
+	fmt.Printf("commands:\n")
+	fmt.Printf("help adr bal send exit\n")
+	return nil
+}

uspv/eight333.go

@@ -43,8 +43,7 @@ type SPVCon struct {
 	WBytes uint64 // total bytes written
 	RBytes uint64 // total bytes read
 
-	TS    *TxStore         // transaction store to write to
-	param *chaincfg.Params // network parameters (testnet3, testnetL)
+	TS *TxStore // transaction store to write to
 
 	// mBlockQueue is for keeping track of what height we've requested.
 	mBlockQueue chan HashAndHeight
@@ -56,16 +55,17 @@ type SPVCon struct {
 	inWaitState chan bool
 }
 
-func OpenSPV(remoteNode string, hfn, tsfn string,
+func OpenSPV(remoteNode string, hfn, dbfn string,
 	inTs *TxStore, p *chaincfg.Params) (SPVCon, error) {
 	// create new SPVCon
 	var s SPVCon
 
-	// assign network parameters to SPVCon
-	s.param = p
+	// I should really merge SPVCon and TxStore, they're basically the same
+	inTs.Param = p
+	s.TS = inTs // copy pointer of txstore into spvcon
 
 	// open header file
-	err := s.openHeaderFile(headerFileName)
+	err := s.openHeaderFile(hfn)
 	if err != nil {
 		return s, err
 	}
@@ -80,12 +80,10 @@ func OpenSPV(remoteNode string, hfn, tsfn string,
 	s.localVersion = VERSION
 
 	// transaction store for this SPV connection
-	inTs.Param = p
-	err = inTs.OpenDB(tsfn)
+	err = inTs.OpenDB(dbfn)
 	if err != nil {
 		return s, err
 	}
-	s.TS = inTs // copy pointer of txstore into spvcon
 
 	myMsgVer, err := wire.NewMsgVersionFromConn(s.con, 0, 0)
 	if err != nil {
@@ -99,7 +97,7 @@ func OpenSPV(remoteNode string, hfn, tsfn string,
 	myMsgVer.AddService(wire.SFNodeBloom)
 
 	// this actually sends
-	n, err := wire.WriteMessageN(s.con, myMsgVer, s.localVersion, s.param.Net)
+	n, err := wire.WriteMessageN(s.con, myMsgVer, s.localVersion, s.TS.Param.Net)
 	if err != nil {
 		return s, err
 	}
@@ -107,7 +105,7 @@ func OpenSPV(remoteNode string, hfn, tsfn string,
 	log.Printf("wrote %d byte version message to %s\n",
 		n, s.con.RemoteAddr().String())
 
-	n, m, b, err := wire.ReadMessageN(s.con, s.localVersion, s.param.Net)
+	n, m, b, err := wire.ReadMessageN(s.con, s.localVersion, s.TS.Param.Net)
 	if err != nil {
 		return s, err
 	}
@@ -126,7 +124,7 @@ func OpenSPV(remoteNode string, hfn, tsfn string,
 	s.remoteHeight = mv.LastBlock
 
 	mva := wire.NewMsgVerAck()
-	n, err = wire.WriteMessageN(s.con, mva, s.localVersion, s.param.Net)
+	n, err = wire.WriteMessageN(s.con, mva, s.localVersion, s.TS.Param.Net)
 	if err != nil {
 		return s, err
 	}
@@ -149,7 +147,7 @@ func (s *SPVCon) openHeaderFile(hfn string) error {
 	if err != nil {
 		if os.IsNotExist(err) {
 			var b bytes.Buffer
-			err = s.param.GenesisBlock.Header.Serialize(&b)
+			err = s.TS.Param.GenesisBlock.Header.Serialize(&b)
 			if err != nil {
 				return err
 			}
@@ -405,7 +403,7 @@ func (s *SPVCon) IngestHeaders(m *wire.MsgHeaders) (bool, error) {
 		// advance chain tip
 		tip++
 		// check last header
-		worked := CheckHeader(s.headerFile, tip, s.param)
+		worked := CheckHeader(s.headerFile, tip, s.TS.Param)
 		if !worked {
 			if endPos < 8080 {
 				// jeez I give up, back to genesis

uspv/msghandler.go

@@ -10,7 +10,7 @@ import (
 
 func (s *SPVCon) incomingMessageHandler() {
 	for {
-		n, xm, _, err := wire.ReadMessageN(s.con, s.localVersion, s.param.Net)
+		n, xm, _, err := wire.ReadMessageN(s.con, s.localVersion, s.TS.Param.Net)
 		if err != nil {
 			log.Printf("ReadMessageN error.  Disconnecting: %s\n", err.Error())
 			return
@@ -64,7 +64,7 @@ func (s *SPVCon) incomingMessageHandler() {
 func (s *SPVCon) outgoingMessageHandler() {
 	for {
 		msg := <-s.outMsgQueue
-		n, err := wire.WriteMessageN(s.con, msg, s.localVersion, s.param.Net)
+		n, err := wire.WriteMessageN(s.con, msg, s.localVersion, s.TS.Param.Net)
 		if err != nil {
 			log.Printf("Write message error: %s", err.Error())
 		}

uspv/txstore.go

@@ -20,7 +20,8 @@ type TxStore struct {
 
 	Adrs    []MyAdr  // endeavouring to acquire capital
 	StateDB *bolt.DB // place to write all this down
-	// this is redundant with the SPVCon param... ugly and should be taken out
+
+	// Params live here, not SCon
 	Param *chaincfg.Params // network parameters (testnet3, testnetL)
 
 	// From here, comes everything. It's a secret to everybody.
@@ -52,9 +53,10 @@ type MyAdr struct { // an address I have the private key for
 	// inside the Adrs slice, right? leave for now
 }
 
-func NewTxStore(rootkey *hdkeychain.ExtendedKey) TxStore {
+func NewTxStore(rootkey *hdkeychain.ExtendedKey, p *chaincfg.Params) TxStore {
 	var txs TxStore
 	txs.rootPrivKey = rootkey
+	txs.Param = p
 	txs.OKTxids = make(map[wire.ShaHash]int32)
 	return txs
 }