forked from lightningnetwork/lnd
/
init.go
127 lines (117 loc) · 2.97 KB
/
init.go
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package uspv
import (
"bytes"
"io/ioutil"
"log"
"net"
"os"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcd/wire"
)
// OpenPV starts a
func OpenSPV(remoteNode string, hfn, dbfn string,
inTs *TxStore, hard bool, iron bool, p *chaincfg.Params) (SPVCon, error) {
// create new SPVCon
var s SPVCon
s.HardMode = hard
s.Ironman = iron
// 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(hfn)
if err != nil {
return s, err
}
// open TCP connection
s.con, err = net.Dial("tcp", remoteNode)
if err != nil {
return s, err
}
// assign version bits for local node
s.localVersion = VERSION
// transaction store for this SPV connection
err = inTs.OpenDB(dbfn)
if err != nil {
return s, err
}
myMsgVer, err := wire.NewMsgVersionFromConn(s.con, 0, 0)
if err != nil {
return s, err
}
err = myMsgVer.AddUserAgent("test", "zero")
if err != nil {
return s, err
}
// must set this to enable SPV stuff
myMsgVer.AddService(wire.SFNodeBloom)
// set this to enable segWit
myMsgVer.AddService(wire.SFNodeWitness)
// this actually sends
n, err := wire.WriteMessageN(s.con, myMsgVer, s.localVersion, s.TS.Param.Net)
if err != nil {
return s, err
}
s.WBytes += uint64(n)
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.TS.Param.Net)
if err != nil {
return s, err
}
s.RBytes += uint64(n)
log.Printf("got %d byte response %x\n command: %s\n", n, b, m.Command())
mv, ok := m.(*wire.MsgVersion)
if ok {
log.Printf("connected to %s", mv.UserAgent)
}
log.Printf("remote reports version %x (dec %d)\n",
mv.ProtocolVersion, mv.ProtocolVersion)
// set remote height
s.remoteHeight = mv.LastBlock
mva := wire.NewMsgVerAck()
n, err = wire.WriteMessageN(s.con, mva, s.localVersion, s.TS.Param.Net)
if err != nil {
return s, err
}
s.WBytes += uint64(n)
s.inMsgQueue = make(chan wire.Message)
go s.incomingMessageHandler()
s.outMsgQueue = make(chan wire.Message)
go s.outgoingMessageHandler()
s.blockQueue = make(chan HashAndHeight, 32) // queue depth 32 is a thing
s.fPositives = make(chan int32, 4000) // a block full, approx
s.inWaitState = make(chan bool, 1)
go s.fPositiveHandler()
if hard {
err = s.TS.Refilter()
if err != nil {
return s, err
}
}
return s, nil
}
func (s *SPVCon) openHeaderFile(hfn string) error {
_, err := os.Stat(hfn)
if err != nil {
if os.IsNotExist(err) {
var b bytes.Buffer
err = s.TS.Param.GenesisBlock.Header.Serialize(&b)
if err != nil {
return err
}
err = ioutil.WriteFile(hfn, b.Bytes(), 0600)
if err != nil {
return err
}
log.Printf("created hardcoded genesis header at %s\n",
hfn)
}
}
s.headerFile, err = os.OpenFile(hfn, os.O_RDWR, 0600)
if err != nil {
return err
}
log.Printf("opened header file %s\n", s.headerFile.Name())
return nil
}