// Download raw transaction from webbtc.com
func GetTxFromWebBTC(txid *btc.Uint256) (raw []byte) {
url := "http://webbtc.com/tx/" + txid.String() + ".bin"
r, er := http.Get(url)
if er == nil && r.StatusCode == 200 {
raw, _ = ioutil.ReadAll(r.Body)
r.Body.Close()
}
return
}
// Get tx with given id from the balance folder, of from cache
func tx_from_balance(txid *btc.Uint256, error_is_fatal bool) (tx *btc.Tx) {
if tx = loadedTxs[txid.Hash]; tx != nil {
return // we have it in cache already
}
fn := "balance/" + txid.String() + ".tx"
buf, er := ioutil.ReadFile(fn)
if er == nil && buf != nil {
var th [32]byte
btc.ShaHash(buf, th[:])
if txid.Hash == th {
tx, _ = btc.NewTx(buf)
if error_is_fatal && tx == nil {
println("Transaction is corrupt:", txid.String())
cleanExit(1)
}
} else if error_is_fatal {
println("Transaction file is corrupt:", txid.String())
cleanExit(1)
}
} else if error_is_fatal {
println("Error reading transaction file:", fn)
if er != nil {
println(er.Error())
}
cleanExit(1)
}
loadedTxs[txid.Hash] = tx // store it in the cache
return
}
// Download raw transaction from blockr.io
func GetTxFromBlockrIo(txid *btc.Uint256) (raw []byte) {
url := "http://btc.blockr.io/api/v1/tx/raw/" + txid.String()
r, er := http.Get(url)
if er == nil && r.StatusCode == 200 {
defer r.Body.Close()
c, _ := ioutil.ReadAll(r.Body)
var txx struct {
Status string
Data struct {
Tx struct {
Hex string
}
}
}
er = json.Unmarshal(c[:], &txx)
if er == nil {
raw, _ = hex.DecodeString(txx.Data.Tx.Hex)
} else {
println("er", er.Error())
}
}
return
}
func main() {
if len(os.Args) < 2 {
fmt.Println("Specify a path to folder containig blockchain.dat and blockchain.new")
fmt.Println("Output bootstrap.dat file will be written in the current folder.")
return
}
blks := chain.NewBlockDB(os.Args[1])
if blks == nil {
return
}
fmt.Println("Loading block index...")
bidx = make(map[[32]byte]*chain.BlockTreeNode, 300e3)
blks.LoadBlockIndex(nil, walk)
var tail, nd *chain.BlockTreeNode
var genesis_block_hash *btc.Uint256
for _, v := range bidx {
if v == tail {
// skip root block (should be only one)
continue
}
par_hash := btc.NewUint256(v.BlockHeader[4:36])
par, ok := bidx[par_hash.Hash]
if !ok {
genesis_block_hash = par_hash
} else {
v.Parent = par
if tail == nil || v.Height > tail.Height {
tail = v
}
}
}
if genesis_block_hash == nil {
println("genesis_block_hash not found")
return
}
var magic []byte
gen_bin, _ := hex.DecodeString(GenesisBitcoin)
tmp := btc.NewSha2Hash(gen_bin[:80])
if genesis_block_hash.Equal(tmp) {
println("Bitcoin genesis block")
magic = []byte{0xF9, 0xBE, 0xB4, 0xD9}
}
if magic == nil {
gen_bin, _ := hex.DecodeString(GenesisTestnet)
tmp = btc.NewSha2Hash(gen_bin[:80])
if genesis_block_hash.Equal(tmp) {
println("Testnet3 genesis block")
magic = []byte{0x0B, 0x11, 0x09, 0x07}
}
}
if magic == nil {
println("Unknow genesis block", genesis_block_hash.String())
println("Aborting since cannot figure out the magic bytes")
return
}
var total_data, curr_data int64
for nd = tail; nd.Parent != nil; {
nd.Parent.Childs = []*chain.BlockTreeNode{nd}
total_data += int64(nd.BlockSize)
nd = nd.Parent
}
fmt.Println("Writting bootstrap.dat, height", tail.Height, " magic", hex.EncodeToString(magic))
f, _ := os.Create("bootstrap.dat")
f.Write(magic)
binary.Write(f, binary.LittleEndian, uint32(len(gen_bin)))
f.Write(gen_bin)
for {
bl, _, _ := blks.BlockGet(nd.BlockHash)
f.Write(magic)
binary.Write(f, binary.LittleEndian, uint32(len(bl)))
f.Write(bl)
curr_data += int64(nd.BlockSize)
if (nd.Height & 0xfff) == 0 {
fmt.Printf("\r%.1f%%...", 100*float64(curr_data)/float64(total_data))
}
if len(nd.Childs) == 0 {
break
}
nd = nd.Childs[0]
}
fmt.Println("\rDone ")
}
func main() {
fmt.Println("Gocoin blockchain downloader version", lib.Version)
parse_command_line()
setup_runtime_vars()
if len(GocoinHomeDir) > 0 && GocoinHomeDir[len(GocoinHomeDir)-1] != os.PathSeparator {
GocoinHomeDir += string(os.PathSeparator)
}
if Testnet {
GocoinHomeDir += "tstnet" + string(os.PathSeparator)
Magic = [4]byte{0x0B, 0x11, 0x09, 0x07}
GenesisBlock = btc.NewUint256FromString("000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943")
fmt.Println("Using testnet3")
} else {
GocoinHomeDir += "btcnet" + string(os.PathSeparator)
}
fmt.Println("GocoinHomeDir:", GocoinHomeDir)
sys.LockDatabaseDir(GocoinHomeDir)
defer sys.UnlockDatabaseDir()
peersdb.Testnet = Testnet
peersdb.InitPeers(GocoinHomeDir)
StartTime = time.Now()
if open_blockchain() {
fmt.Printf("Blockchain opening aborted\n")
return
}
fmt.Println("Blockchain open in", time.Now().Sub(StartTime))
go do_usif()
download_headers()
if GlobalExit() {
TheBlockChain.Close()
return
}
var HighestTrustedBlock *btc.Uint256
if LastTrustedBlock == "all" {
HighestTrustedBlock = TheBlockChain.BlockTreeEnd.BlockHash
fmt.Println("Assume all blocks trusted")
} else if LastTrustedBlock == "auto" {
if LastBlockHeight > 6 {
use := LastBlockHeight - 6
ha := BlocksToGet[use]
HighestTrustedBlock = btc.NewUint256(ha[:])
fmt.Println("Assume last trusted block as", HighestTrustedBlock.String(), "at", use)
} else {
fmt.Println("-t=auto ignored since LastBlockHeight is only", LastBlockHeight)
}
} else if LastTrustedBlock != "" {
HighestTrustedBlock = btc.NewUint256FromString(LastTrustedBlock)
}
if HighestTrustedBlock != nil {
for k, h := range BlocksToGet {
if bytes.Equal(h[:], HighestTrustedBlock.Hash[:]) {
TrustUpTo = k
break
}
}
} else {
fmt.Println("WARNING: The trusted block not found (it will be very slow).")
}
for n := TheBlockChain.BlockTreeEnd; n != nil && n.Height > TheBlockChain.BlockTreeEnd.Height-BSLEN; n = n.Parent {
blocksize_update(int(n.BlockSize))
}
fmt.Println("Downloading blocks - BlocksToGet:", len(BlocksToGet), " avg_size:", avg_block_size())
usif_prompt()
StartTime = time.Now()
get_blocks()
fmt.Println("Up to block", TheBlockChain.BlockTreeEnd.Height, "in", time.Now().Sub(StartTime).String())
close_all_connections()
peersdb.ClosePeerDB()
StartTime = time.Now()
fmt.Print("All blocks done - defrag unspent")
qdb.SetDefragPercent(100)
for {
if !TheBlockChain.Unspent.Idle() {
break
}
fmt.Print(".")
}
fmt.Println("\nDefrag unspent done in", time.Now().Sub(StartTime).String())
TheBlockChain.Close()
return
}
// Download (and re-assemble) raw transaction from blockexplorer.com
func GetTxFromExplorer(txid *btc.Uint256) ([]byte, []byte) {
url := "http://blockexplorer.com/rawtx/" + txid.String()
r, er := http.Get(url)
if er == nil && r.StatusCode == 200 {
defer r.Body.Close()
c, _ := ioutil.ReadAll(r.Body)
var txx onetx
er = json.Unmarshal(c[:], &txx)
if er == nil {
// This part looks weird, but this is how I solved seq=FFFFFFFF, if the field not present:
for i := range txx.In {
txx.In[i].Sequence = 0xffffffff
}
json.Unmarshal(c[:], &txx)
// ... end of the weird solution
tx := new(btc.Tx)
tx.Version = txx.Ver
tx.TxIn = make([]*btc.TxIn, len(txx.In))
for i := range txx.In {
tx.TxIn[i] = new(btc.TxIn)
tx.TxIn[i].Input.Hash = btc.NewUint256FromString(txx.In[i].Prev_out.Hash).Hash
tx.TxIn[i].Input.Vout = txx.In[i].Prev_out.N
if txx.In[i].Prev_out.N == 0xffffffff &&
txx.In[i].Prev_out.Hash == "0000000000000000000000000000000000000000000000000000000000000000" {
tx.TxIn[i].ScriptSig, _ = hex.DecodeString(txx.In[i].Coinbase)
} else {
tx.TxIn[i].ScriptSig, _ = btc.DecodeScript(txx.In[i].ScriptSig)
}
tx.TxIn[i].Sequence = txx.In[i].Sequence
}
tx.TxOut = make([]*btc.TxOut, len(txx.Out))
for i := range txx.Out {
am, er := btc.StringToSatoshis(txx.Out[i].Value)
if er != nil {
fmt.Println("Incorrect BTC amount", txx.Out[i].Value, er.Error())
return nil, nil
}
tx.TxOut[i] = new(btc.TxOut)
tx.TxOut[i].Value = am
tx.TxOut[i].Pk_script, _ = btc.DecodeScript(txx.Out[i].ScriptPubKey)
}
tx.Lock_time = txx.Lock_time
rawtx := tx.Serialize()
if txx.Size != uint(len(rawtx)) {
fmt.Printf("Transaction size mismatch: %d expexted, %d decoded\n", txx.Size, len(rawtx))
return nil, rawtx
}
curid := btc.NewSha2Hash(rawtx)
if !curid.Equal(txid) {
fmt.Println("The downloaded transaction does not match its ID.", txid.String())
return nil, rawtx
}
return rawtx, rawtx
} else {
fmt.Println("json.Unmarshal:", er.Error())
}
} else {
if er != nil {
fmt.Println("http.Get:", er.Error())
} else {
fmt.Println("StatusCode=", r.StatusCode)
}
}
return nil, nil
}