a18d9b8449
This commit modifies the GetUtxo method of the BlockChainIO interface to be more light client friendly by introducing a height hint which gives light clients that don’t have UTXO set commitments a way in which they can restrict their search space. Light clients will now be able to have a concrete cut off point in the chain as they scan backwards for spentness of an output.
91 lines
2.4 KiB
Go
91 lines
2.4 KiB
Go
package btcwallet
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import (
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"encoding/hex"
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"errors"
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"github.com/lightningnetwork/lnd/lnwallet"
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"github.com/roasbeef/btcd/chaincfg/chainhash"
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"github.com/roasbeef/btcd/wire"
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)
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var (
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// ErrOutputSpent is returned by the GetUtxo method if the target output
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// for lookup has already been spent.
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ErrOutputSpent = errors.New("target output has been spent")
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)
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// GetBestBlock returns the current height and hash of the best known block
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// within the main chain.
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//
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// This method is a part of the lnwallet.BlockChainIO interface.
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func (b *BtcWallet) GetBestBlock() (*chainhash.Hash, int32, error) {
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return b.rpc.GetBestBlock()
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}
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// GetUtxo returns the original output referenced by the passed outpoint.
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//
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// This method is a part of the lnwallet.BlockChainIO interface.
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func (b *BtcWallet) GetUtxo(op *wire.OutPoint, _ uint32) (*wire.TxOut, error) {
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txout, err := b.rpc.GetTxOut(&op.Hash, op.Index, false)
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if err != nil {
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return nil, err
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} else if txout == nil {
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return nil, ErrOutputSpent
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}
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pkScript, err := hex.DecodeString(txout.ScriptPubKey.Hex)
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if err != nil {
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return nil, err
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}
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return &wire.TxOut{
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// Sadly, gettxout returns the output value in BTC
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// instead of satoshis.
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Value: int64(txout.Value * 1e8),
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PkScript: pkScript,
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}, nil
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}
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// GetTransaction returns the full transaction identified by the passed
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// transaction ID.
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//
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// This method is a part of the lnwallet.BlockChainIO interface.
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func (b *BtcWallet) GetTransaction(txid *chainhash.Hash) (*wire.MsgTx, error) {
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tx, err := b.rpc.GetRawTransaction(txid)
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if err != nil {
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return nil, err
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}
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return tx.MsgTx(), nil
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}
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// GetBlock returns a raw block from the server given its hash.
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//
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// This method is a part of the lnwallet.BlockChainIO interface.
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func (b *BtcWallet) GetBlock(blockHash *chainhash.Hash) (*wire.MsgBlock, error) {
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block, err := b.rpc.GetBlock(blockHash)
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if err != nil {
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return nil, err
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}
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return block, nil
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}
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// GetBlockHash returns the hash of the block in the best blockchain at the
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// given height.
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//
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// This method is a part of the lnwallet.BlockChainIO interface.
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func (b *BtcWallet) GetBlockHash(blockHeight int64) (*chainhash.Hash, error) {
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blockHash, err := b.rpc.GetBlockHash(blockHeight)
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if err != nil {
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return nil, err
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}
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return blockHash, nil
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}
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// A compile time check to ensure that BtcWallet implements the BlockChainIO
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// interface.
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var _ lnwallet.WalletController = (*BtcWallet)(nil)
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