77 lines
2.4 KiB
Go
77 lines
2.4 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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"fmt"
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"github.com/btcsuite/btcd/rpcclient"
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"github.com/btcsuite/btcd/wire"
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"github.com/btcsuite/btcutil"
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"github.com/vulcanize/ipfs-blockchain-watcher/pkg/shared"
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)
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// PayloadFetcher satisfies the PayloadFetcher interface for bitcoin
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type PayloadFetcher struct {
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// PayloadFetcher is thread-safe as long as the underlying client is thread-safe, since it has/modifies no other state
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// http.Client is thread-safe
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client *rpcclient.Client
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}
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// NewStateDiffFetcher returns a PayloadFetcher
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func NewPayloadFetcher(c *rpcclient.ConnConfig) (*PayloadFetcher, error) {
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client, err := rpcclient.New(c, nil)
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if err != nil {
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return nil, err
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}
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return &PayloadFetcher{
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client: client,
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}, nil
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}
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// FetchAt fetches the block payloads at the given block heights
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func (fetcher *PayloadFetcher) FetchAt(blockHeights []uint64) ([]shared.RawChainData, error) {
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blockPayloads := make([]shared.RawChainData, len(blockHeights))
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for i, height := range blockHeights {
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hash, err := fetcher.client.GetBlockHash(int64(height))
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if err != nil {
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return nil, fmt.Errorf("bitcoin PayloadFetcher GetBlockHash err at blockheight %d: %s", height, err.Error())
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}
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block, err := fetcher.client.GetBlock(hash)
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if err != nil {
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return nil, fmt.Errorf("bitcoin PayloadFetcher GetBlock err at blockheight %d: %s", height, err.Error())
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}
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blockPayloads[i] = BlockPayload{
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BlockHeight: int64(height),
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Header: &block.Header,
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Txs: msgTxsToUtilTxs(block.Transactions),
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}
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}
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return blockPayloads, nil
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}
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func msgTxsToUtilTxs(msgs []*wire.MsgTx) []*btcutil.Tx {
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txs := make([]*btcutil.Tx, len(msgs))
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for i, msg := range msgs {
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tx := btcutil.NewTx(msg)
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tx.SetIndex(i)
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txs[i] = tx
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}
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return txs
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}
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