74 lines
1.8 KiB
Go
74 lines
1.8 KiB
Go
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package spvchain
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import (
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"github.com/btcsuite/btcd/chaincfg/chainhash"
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"github.com/btcsuite/btcd/wire"
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"github.com/btcsuite/btcutil/gcs"
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"github.com/btcsuite/btcutil/gcs/builder"
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)
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func buildBasicFilter(block *wire.MsgBlock) (*gcs.Filter, error) {
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blockHash := block.BlockHash()
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b := builder.WithKeyHash(&blockHash)
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_, err := b.Key()
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if err != nil {
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str := "failed to create filter builder: %v"
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return nil, log.Errorf(str, err)
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}
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for i, tx := range block.Transactions {
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// Skip the inputs for the coinbase transaction
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if i != 0 {
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for _, txIn := range tx.TxIn {
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b.AddOutPoint(txIn.PreviousOutPoint)
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}
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}
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for _, txOut := range tx.TxOut {
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b.AddScript(txOut.PkScript)
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}
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}
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f, err := b.Build()
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if err != nil {
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str := "failed to build filter: %v"
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return nil, log.Errorf(str, err)
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}
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return f, nil
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}
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func buildExtFilter(block *wire.MsgBlock) (*gcs.Filter, error) {
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blockHash := block.BlockHash()
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b := builder.WithKeyHash(&blockHash)
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_, err := b.Key()
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if err != nil {
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str := "failed to create filter builder: %v"
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return nil, log.Errorf(str, err)
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}
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for i, tx := range block.Transactions {
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txHash := tx.TxHash()
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b.AddHash(&txHash)
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// Skip the inputs for the coinbase transaction
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if i != 0 {
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for _, txIn := range tx.TxIn {
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b.AddScript(txIn.SignatureScript)
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}
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}
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}
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f, err := b.Build()
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if err != nil {
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str := "failed to build filter: %v"
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return nil, log.Errorf(str, err)
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}
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return f, nil
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}
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func getFilterHash(filter *gcs.Filter) chainhash.Hash {
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return chainhash.HashH(filter.NBytes())
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}
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func makeHeaderForFilter(filter *gcs.Filter, prevHeader chainhash.Hash) chainhash.Hash {
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filterTip := make([]byte, 2*chainhash.HashSize)
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filterHash := getFilterHash(filter)
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copy(filterTip, filterHash[:])
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copy(filterTip[chainhash.HashSize:], prevHeader[:])
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return chainhash.HashH(filterTip)
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}
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