29d0c0cc6f
also switch heights from uint32 to int32, which I guess is what they use. Makes this thing last 2 billion blocks shorter. If we get past uint32 time.
412 lines
10 KiB
Go
412 lines
10 KiB
Go
package uspv
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"log"
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"net"
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"os"
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"github.com/boltdb/bolt"
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"github.com/btcsuite/btcd/chaincfg"
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"github.com/btcsuite/btcd/wire"
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"github.com/btcsuite/btcutil/bloom"
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)
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const (
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keyFileName = "testseed.hex"
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headerFileName = "headers.bin"
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// Except hash-160s, those aren't backwards. But anything that's 32 bytes is.
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// because, cmon, 32? Gotta reverse that. But 20? 20 is OK.
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// version hardcoded for now, probably ok...?
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VERSION = 70011
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)
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type SPVCon struct {
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con net.Conn // the (probably tcp) connection to the node
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headerFile *os.File // file for SPV headers
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localVersion uint32 // version we report
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remoteVersion uint32 // version remote node
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remoteHeight int32 // block height they're on
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// what's the point of the input queue? remove? leave for now...
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inMsgQueue chan wire.Message // Messages coming in from remote node
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outMsgQueue chan wire.Message // Messages going out to remote node
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WBytes uint64 // total bytes written
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RBytes uint64 // total bytes read
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TS *TxStore // transaction store to write to
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param *chaincfg.Params // network parameters (testnet3, testnetL)
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// mBlockQueue is for keeping track of what height we've requested.
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mBlockQueue chan RootAndHeight
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}
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func OpenSPV(remoteNode string, hfn string,
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inTs *TxStore, p *chaincfg.Params) (SPVCon, error) {
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// create new SPVCon
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var s SPVCon
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// assign network parameters to SPVCon
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s.param = p
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// open header file
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err := s.openHeaderFile(headerFileName)
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if err != nil {
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return s, err
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}
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// open TCP connection
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s.con, err = net.Dial("tcp", remoteNode)
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if err != nil {
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return s, err
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}
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// assign version bits for local node
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s.localVersion = VERSION
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// transaction store for this SPV connection
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err = inTs.OpenDB("utxo.db")
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if err != nil {
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return s, err
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}
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s.TS = inTs
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myMsgVer, err := wire.NewMsgVersionFromConn(s.con, 0, 0)
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if err != nil {
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return s, err
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}
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err = myMsgVer.AddUserAgent("test", "zero")
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if err != nil {
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return s, err
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}
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// must set this to enable SPV stuff
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myMsgVer.AddService(wire.SFNodeBloom)
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// this actually sends
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n, err := wire.WriteMessageN(s.con, myMsgVer, s.localVersion, s.param.Net)
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if err != nil {
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return s, err
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}
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s.WBytes += uint64(n)
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log.Printf("wrote %d byte version message to %s\n",
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n, s.con.RemoteAddr().String())
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n, m, b, err := wire.ReadMessageN(s.con, s.localVersion, s.param.Net)
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if err != nil {
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return s, err
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}
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s.RBytes += uint64(n)
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log.Printf("got %d byte response %x\n command: %s\n", n, b, m.Command())
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mv, ok := m.(*wire.MsgVersion)
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if ok {
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log.Printf("connected to %s", mv.UserAgent)
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}
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log.Printf("remote reports version %x (dec %d)\n",
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mv.ProtocolVersion, mv.ProtocolVersion)
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// set remote height
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s.remoteHeight = mv.LastBlock
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mva := wire.NewMsgVerAck()
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n, err = wire.WriteMessageN(s.con, mva, s.localVersion, s.param.Net)
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if err != nil {
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return s, err
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}
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s.WBytes += uint64(n)
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s.inMsgQueue = make(chan wire.Message, 1)
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go s.incomingMessageHandler()
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s.outMsgQueue = make(chan wire.Message, 1)
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go s.outgoingMessageHandler()
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s.mBlockQueue = make(chan RootAndHeight, 32) // queue depth 32 is a thing
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return s, nil
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}
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func (ts *TxStore) OpenDB(filename string) error {
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var err error
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ts.StateDB, err = bolt.Open(filename, 0644, nil)
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if err != nil {
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return err
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}
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// create buckets if they're not already there
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return ts.StateDB.Update(func(tx *bolt.Tx) error {
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_, err = tx.CreateBucketIfNotExists(BKTUtxos)
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if err != nil {
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return err
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}
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_, err = tx.CreateBucketIfNotExists(BKTOld)
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if err != nil {
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return err
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}
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return nil
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})
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}
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func (s *SPVCon) openHeaderFile(hfn string) error {
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_, err := os.Stat(hfn)
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if err != nil {
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if os.IsNotExist(err) {
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var b bytes.Buffer
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err = s.param.GenesisBlock.Header.Serialize(&b)
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if err != nil {
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return err
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}
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err = ioutil.WriteFile(hfn, b.Bytes(), 0600)
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if err != nil {
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return err
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}
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log.Printf("created hardcoded genesis header at %s\n",
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hfn)
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}
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}
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s.headerFile, err = os.OpenFile(hfn, os.O_RDWR, 0600)
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if err != nil {
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return err
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}
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log.Printf("opened header file %s\n", s.headerFile.Name())
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return nil
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}
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func (s *SPVCon) PongBack(nonce uint64) {
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mpong := wire.NewMsgPong(nonce)
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s.outMsgQueue <- mpong
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return
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}
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func (s *SPVCon) SendFilter(f *bloom.Filter) {
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s.outMsgQueue <- f.MsgFilterLoad()
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return
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}
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// HeightFromHeader gives you the block height given a 80 byte block header
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// seems like looking for the merkle root is the best way to do this
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func (s *SPVCon) HeightFromHeader(query wire.BlockHeader) (uint32, error) {
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// start from the most recent and work back in time; even though that's
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// kind of annoying it's probably a lot faster since things tend to have
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// happened recently.
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// seek to last header
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lastPos, err := s.headerFile.Seek(-80, os.SEEK_END)
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if err != nil {
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return 0, err
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}
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height := lastPos / 80
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var current wire.BlockHeader
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for height > 0 {
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// grab header from disk
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err = current.Deserialize(s.headerFile)
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if err != nil {
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return 0, err
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}
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// check if merkle roots match
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if current.MerkleRoot.IsEqual(&query.MerkleRoot) {
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// if they do, great, return height
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return uint32(height), nil
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}
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// skip back one header (2 because we just read one)
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_, err = s.headerFile.Seek(-160, os.SEEK_CUR)
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if err != nil {
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return 0, err
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}
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// decrement height
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height--
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}
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// finished for loop without finding match
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return 0, fmt.Errorf("Header not found on disk")
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}
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func (s *SPVCon) AskForHeaders() error {
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var hdr wire.BlockHeader
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ghdr := wire.NewMsgGetHeaders()
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ghdr.ProtocolVersion = s.localVersion
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info, err := s.headerFile.Stat()
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if err != nil {
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return err
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}
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headerFileSize := info.Size()
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if headerFileSize == 0 || headerFileSize%80 != 0 { // header file broken
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return fmt.Errorf("Header file not a multiple of 80 bytes")
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}
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// seek to 80 bytes from end of file
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ns, err := s.headerFile.Seek(-80, os.SEEK_END)
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if err != nil {
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log.Printf("can't seek\n")
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return err
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}
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log.Printf("suk to offset %d (should be near the end\n", ns)
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// get header from last 80 bytes of file
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err = hdr.Deserialize(s.headerFile)
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if err != nil {
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log.Printf("can't Deserialize")
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return err
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}
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cHash := hdr.BlockSha()
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err = ghdr.AddBlockLocatorHash(&cHash)
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if err != nil {
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return err
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}
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fmt.Printf("get headers message has %d header hashes, first one is %s\n",
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len(ghdr.BlockLocatorHashes), ghdr.BlockLocatorHashes[0].String())
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s.outMsgQueue <- ghdr
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return nil
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}
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func (s *SPVCon) IngestHeaders(m *wire.MsgHeaders) (bool, error) {
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var err error
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// seek to last header
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_, err = s.headerFile.Seek(-80, os.SEEK_END)
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if err != nil {
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return false, err
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}
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var last wire.BlockHeader
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err = last.Deserialize(s.headerFile)
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if err != nil {
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return false, err
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}
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prevHash := last.BlockSha()
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gotNum := int64(len(m.Headers))
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if gotNum > 0 {
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fmt.Printf("got %d headers. Range:\n%s - %s\n",
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gotNum, m.Headers[0].BlockSha().String(),
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m.Headers[len(m.Headers)-1].BlockSha().String())
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} else {
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log.Printf("got 0 headers, we're probably synced up")
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return false, nil
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}
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endPos, err := s.headerFile.Seek(0, os.SEEK_END)
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if err != nil {
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return false, err
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}
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// check first header returned to make sure it fits on the end
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// of our header file
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if !m.Headers[0].PrevBlock.IsEqual(&prevHash) {
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// delete 100 headers if this happens! Dumb reorg.
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log.Printf("possible reorg; header msg doesn't fit. points to %s, expect %s",
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m.Headers[0].PrevBlock.String(), prevHash.String())
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if endPos < 8080 {
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// jeez I give up, back to genesis
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s.headerFile.Truncate(80)
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} else {
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err = s.headerFile.Truncate(endPos - 8000)
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if err != nil {
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return false, fmt.Errorf("couldn't truncate header file")
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}
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}
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return false, fmt.Errorf("Truncated header file to try again")
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}
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tip := endPos / 80
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tip-- // move back header length so it can read last header
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for _, resphdr := range m.Headers {
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// write to end of file
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err = resphdr.Serialize(s.headerFile)
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if err != nil {
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return false, err
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}
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// advance chain tip
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tip++
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// check last header
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worked := CheckHeader(s.headerFile, tip, s.param)
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if !worked {
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if endPos < 8080 {
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// jeez I give up, back to genesis
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s.headerFile.Truncate(80)
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} else {
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err = s.headerFile.Truncate(endPos - 8000)
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if err != nil {
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return false, fmt.Errorf("couldn't truncate header file")
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}
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}
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// probably should disconnect from spv node at this point,
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// since they're giving us invalid headers.
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return false, fmt.Errorf(
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"Header %d - %s doesn't fit, dropping 100 headers.",
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resphdr.BlockSha().String(), tip)
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}
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}
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log.Printf("Headers to height %d OK.", tip)
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return true, nil
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}
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// RootAndHeight is needed instead of just height in case a fullnode
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// responds abnormally (?) by sending out of order merkleblocks.
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// we cache a merkleroot:height pair in the queue so we don't have to
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// look them up from the disk.
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type RootAndHeight struct {
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root wire.ShaHash
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height int32
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}
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// NewRootAndHeight saves like 2 lines.
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func NewRootAndHeight(r wire.ShaHash, h int32) (rah RootAndHeight) {
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rah.root = r
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rah.height = h
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return
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}
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// AskForMerkBlocks requests blocks from current to last
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// right now this asks for 1 block per getData message.
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// Maybe it's faster to ask for many in a each message?
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func (s *SPVCon) AskForMerkBlocks(current, last int32) error {
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var hdr wire.BlockHeader
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// if last is 0, that means go as far as we can
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if last == 0 {
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n, err := s.headerFile.Seek(-80, os.SEEK_END)
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if err != nil {
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return err
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}
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last = int32(n / 80)
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}
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_, err := s.headerFile.Seek(int64(current*80), os.SEEK_SET)
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if err != nil {
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return err
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}
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// loop through all heights where we want merkleblocks.
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for current < last {
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// load header from file
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err = hdr.Deserialize(s.headerFile)
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if err != nil {
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return err
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}
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bHash := hdr.BlockSha()
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// create inventory we're asking for
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iv1 := wire.NewInvVect(wire.InvTypeFilteredBlock, &bHash)
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gdataMsg := wire.NewMsgGetData()
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// add inventory
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err = gdataMsg.AddInvVect(iv1)
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if err != nil {
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return err
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}
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rah := NewRootAndHeight(hdr.MerkleRoot, current)
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s.outMsgQueue <- gdataMsg
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s.mBlockQueue <- rah // push height and mroot of requested block on queue
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current++
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}
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return nil
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}
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