103 lines
3.3 KiB
Go
103 lines
3.3 KiB
Go
// VulcanizeDB
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// Copyright © 2019 Vulcanize
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package btc
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import (
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"encoding/hex"
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"fmt"
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"github.com/btcsuite/btcd/chaincfg"
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"github.com/btcsuite/btcd/txscript"
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"github.com/vulcanize/ipfs-chain-watcher/pkg/shared"
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)
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// PayloadConverter satisfies the PayloadConverter interface for bitcoin
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type PayloadConverter struct {
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chainConfig *chaincfg.Params
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}
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// NewPayloadConverter creates a pointer to a new PayloadConverter which satisfies the PayloadConverter interface
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func NewPayloadConverter(chainConfig *chaincfg.Params) *PayloadConverter {
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return &PayloadConverter{
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chainConfig: chainConfig,
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}
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}
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// Convert method is used to convert a bitcoin BlockPayload to an IPLDPayload
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// Satisfies the shared.PayloadConverter interface
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func (pc *PayloadConverter) Convert(payload shared.RawChainData) (shared.ConvertedData, error) {
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btcBlockPayload, ok := payload.(BlockPayload)
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if !ok {
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return nil, fmt.Errorf("btc converter: expected payload type %T got %T", BlockPayload{}, payload)
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}
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txMeta := make([]TxModelWithInsAndOuts, len(btcBlockPayload.Txs))
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for i, tx := range btcBlockPayload.Txs {
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txModel := TxModelWithInsAndOuts{
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TxHash: tx.Hash().String(),
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Index: int64(i),
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SegWit: tx.HasWitness(),
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TxOutputs: make([]TxOutput, len(tx.MsgTx().TxOut)),
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TxInputs: make([]TxInput, len(tx.MsgTx().TxIn)),
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}
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if tx.HasWitness() {
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txModel.WitnessHash = tx.WitnessHash().String()
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}
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for i, in := range tx.MsgTx().TxIn {
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txModel.TxInputs[i] = TxInput{
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Index: int64(i),
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SignatureScript: in.SignatureScript,
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PreviousOutPointHash: in.PreviousOutPoint.Hash.String(),
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PreviousOutPointIndex: in.PreviousOutPoint.Index,
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TxWitness: convertBytesToHexArray(in.Witness),
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}
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}
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for i, out := range tx.MsgTx().TxOut {
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scriptClass, addresses, numberOfSigs, err := txscript.ExtractPkScriptAddrs(out.PkScript, pc.chainConfig)
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// if we receive an error but the txscript type isn't NonStandardTy then something went wrong
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if err != nil && scriptClass != txscript.NonStandardTy {
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return nil, err
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}
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stringAddrs := make([]string, len(addresses))
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for i, addr := range addresses {
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stringAddrs[i] = addr.EncodeAddress()
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}
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txModel.TxOutputs[i] = TxOutput{
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Index: int64(i),
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Value: out.Value,
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PkScript: out.PkScript,
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RequiredSigs: int64(numberOfSigs),
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ScriptClass: uint8(scriptClass),
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Addresses: stringAddrs,
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}
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}
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txMeta[i] = txModel
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}
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return ConvertedPayload{
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BlockPayload: btcBlockPayload,
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TxMetaData: txMeta,
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}, nil
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}
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func convertBytesToHexArray(bytea [][]byte) []string {
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var strs []string
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for _, b := range bytea {
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strs = append(strs, hex.EncodeToString(b))
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}
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return strs
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}
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