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 blockchain 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)