lnd.xprv/lnwallet/btcwallet/blockchain.go

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package btcwallet
import (
"encoding/hex"
"errors"
"github.com/lightningnetwork/lnd/lnwallet"
"github.com/roasbeef/btcd/chaincfg/chainhash"
"github.com/roasbeef/btcd/wire"
)
var (
// ErrOutputSpent is returned by the GetUtxo method if the target output
// for lookup has already been spent.
ErrOutputSpent = errors.New("target output has been spent")
)
// GetBestBlock returns the current height and hash of the best known block
// within the main chain.
//
// This method is a part of the lnwallet.BlockChainIO interface.
func (b *BtcWallet) GetBestBlock() (*chainhash.Hash, int32, error) {
return b.rpc.GetBestBlock()
}
// GetTxOut returns the original output referenced by the passed outpoint.
//
// This method is a part of the lnwallet.BlockChainIO interface.
func (b *BtcWallet) GetUtxo(txid *chainhash.Hash, index uint32) (*wire.TxOut, error) {
txout, err := b.rpc.GetTxOut(txid, index, false)
if err != nil {
return nil, err
} else if txout == nil {
return nil, ErrOutputSpent
}
pkScript, err := hex.DecodeString(txout.ScriptPubKey.Hex)
if err != nil {
return nil, err
}
return &wire.TxOut{
// Sadly, gettxout returns the output value in BTC
// instead of satoshis.
Value: int64(txout.Value * 1e8),
PkScript: pkScript,
}, nil
}
// GetTransaction returns the full transaction identified by the passed
// transaction ID.
//
// This method is a part of the lnwallet.BlockChainIO interface.
func (b *BtcWallet) GetTransaction(txid *chainhash.Hash) (*wire.MsgTx, error) {
tx, err := b.rpc.GetRawTransaction(txid)
if err != nil {
return nil, err
}
return tx.MsgTx(), nil
}
// GetBlock returns a raw block from the server given its hash.
//
// This method is a part of the lnwallet.BlockChainIO interface.
func (b *BtcWallet) GetBlock(blockHash *chainhash.Hash) (*wire.MsgBlock, error) {
block, err := b.rpc.GetBlock(blockHash)
if err != nil {
return nil, err
}
return block, nil
}
// GetBlockHash returns the hash of the block in the best block chain at the
// given height.
//
// This method is a part of the lnwallet.BlockChainIO interface.
func (b *BtcWallet) GetBlockHash(blockHeight int64) (*chainhash.Hash, error) {
blockHash, err := b.rpc.GetBlockHash(blockHeight)
if err != nil {
return nil, err
}
return blockHash, nil
}
// A compile time check to ensure that BtcWallet implements the BlockChainIO
// interface.
var _ lnwallet.WalletController = (*BtcWallet)(nil)