144 lines
3.6 KiB
Go
144 lines
3.6 KiB
Go
package btg
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import (
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"bytes"
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"encoding/binary"
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"io"
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"github.com/martinboehm/btcd/chaincfg/chainhash"
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"github.com/martinboehm/btcd/wire"
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"github.com/martinboehm/btcutil/chaincfg"
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"spacecruft.org/spacecruft/blockbook/bchain"
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"spacecruft.org/spacecruft/blockbook/bchain/coins/btc"
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"spacecruft.org/spacecruft/blockbook/bchain/coins/utils"
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)
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const (
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// MainnetMagic is mainnet network constant
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MainnetMagic wire.BitcoinNet = 0x446d47e1
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// TestnetMagic is testnet network constant
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TestnetMagic wire.BitcoinNet = 0x456e48e2
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)
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var (
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// MainNetParams are parser parameters for mainnet
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MainNetParams chaincfg.Params
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// TestNetParams are parser parameters for testnet
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TestNetParams chaincfg.Params
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)
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func init() {
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MainNetParams = chaincfg.MainNetParams
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MainNetParams.Net = MainnetMagic
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// Address encoding magics
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MainNetParams.PubKeyHashAddrID = []byte{38} // base58 prefix: G
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MainNetParams.ScriptHashAddrID = []byte{23} // base58 prefix: A
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TestNetParams = chaincfg.TestNet3Params
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TestNetParams.Net = TestnetMagic
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// Human-readable part for Bech32 encoded segwit addresses, as defined in
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// BIP 173.
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// see https://github.com/satoshilabs/slips/blob/master/slip-0173.md
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MainNetParams.Bech32HRPSegwit = "btg"
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TestNetParams.Bech32HRPSegwit = "tbtg"
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}
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// BGoldParser handle
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type BGoldParser struct {
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*btc.BitcoinParser
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}
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// NewBGoldParser returns new BGoldParser instance
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func NewBGoldParser(params *chaincfg.Params, c *btc.Configuration) *BGoldParser {
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return &BGoldParser{BitcoinParser: btc.NewBitcoinParser(params, c)}
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}
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// GetChainParams contains network parameters for the main Bitcoin Cash network,
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// the regression test Bitcoin Cash network, the test Bitcoin Cash network and
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// the simulation test Bitcoin Cash network, in this order
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func GetChainParams(chain string) *chaincfg.Params {
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if !chaincfg.IsRegistered(&MainNetParams) {
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err := chaincfg.Register(&MainNetParams)
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if err == nil {
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err = chaincfg.Register(&TestNetParams)
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}
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if err != nil {
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panic(err)
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}
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}
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switch chain {
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case "test":
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return &TestNetParams
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case "regtest":
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return &chaincfg.RegressionNetParams
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default:
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return &MainNetParams
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}
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}
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// headerFixedLength is the length of fixed fields of a block (i.e. without solution)
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// see https://github.com/BTCGPU/BTCGPU/wiki/Technical-Spec#block-header
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const headerFixedLength = 44 + (chainhash.HashSize * 3)
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const timestampOffset = 100
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const timestampLength = 4
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// ParseBlock parses raw block to our Block struct
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func (p *BGoldParser) ParseBlock(b []byte) (*bchain.Block, error) {
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r := bytes.NewReader(b)
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time, err := getTimestampAndSkipHeader(r, 0)
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if err != nil {
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return nil, err
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}
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w := wire.MsgBlock{}
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err = utils.DecodeTransactions(r, 0, wire.WitnessEncoding, &w)
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if err != nil {
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return nil, err
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}
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txs := make([]bchain.Tx, len(w.Transactions))
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for ti, t := range w.Transactions {
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txs[ti] = p.TxFromMsgTx(t, false)
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}
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return &bchain.Block{
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BlockHeader: bchain.BlockHeader{
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Size: len(b),
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Time: time,
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},
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Txs: txs,
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}, nil
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}
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func getTimestampAndSkipHeader(r io.ReadSeeker, pver uint32) (int64, error) {
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_, err := r.Seek(timestampOffset, io.SeekStart)
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if err != nil {
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return 0, err
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}
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buf := make([]byte, timestampLength)
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if _, err = io.ReadFull(r, buf); err != nil {
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return 0, err
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}
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time := binary.LittleEndian.Uint32(buf)
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_, err = r.Seek(headerFixedLength-timestampOffset-timestampLength, io.SeekCurrent)
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if err != nil {
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return 0, err
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}
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size, err := wire.ReadVarInt(r, pver)
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if err != nil {
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return 0, err
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}
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_, err = r.Seek(int64(size), io.SeekCurrent)
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if err != nil {
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return 0, err
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}
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return int64(time), nil
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}
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