ipld-eth-server/pkg/btc/payload_fetcher.go
2020-05-29 22:02:47 -05:00

77 lines
2.4 KiB
Go

// VulcanizeDB
// Copyright © 2019 Vulcanize
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package btc
import (
"fmt"
"github.com/btcsuite/btcd/rpcclient"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
"github.com/vulcanize/ipfs-chain-watcher/pkg/shared"
)
// PayloadFetcher satisfies the PayloadFetcher interface for bitcoin
type PayloadFetcher struct {
// PayloadFetcher is thread-safe as long as the underlying client is thread-safe, since it has/modifies no other state
// http.Client is thread-safe
client *rpcclient.Client
}
// NewStateDiffFetcher returns a PayloadFetcher
func NewPayloadFetcher(c *rpcclient.ConnConfig) (*PayloadFetcher, error) {
client, err := rpcclient.New(c, nil)
if err != nil {
return nil, err
}
return &PayloadFetcher{
client: client,
}, nil
}
// FetchAt fetches the block payloads at the given block heights
func (fetcher *PayloadFetcher) FetchAt(blockHeights []uint64) ([]shared.RawChainData, error) {
blockPayloads := make([]shared.RawChainData, len(blockHeights))
for i, height := range blockHeights {
hash, err := fetcher.client.GetBlockHash(int64(height))
if err != nil {
return nil, fmt.Errorf("bitcoin PayloadFetcher GetBlockHash err at blockheight %d: %s", height, err.Error())
}
block, err := fetcher.client.GetBlock(hash)
if err != nil {
return nil, fmt.Errorf("bitcoin PayloadFetcher GetBlock err at blockheight %d: %s", height, err.Error())
}
blockPayloads[i] = BlockPayload{
BlockHeight: int64(height),
Header: &block.Header,
Txs: msgTxsToUtilTxs(block.Transactions),
}
}
return blockPayloads, nil
}
func msgTxsToUtilTxs(msgs []*wire.MsgTx) []*btcutil.Tx {
txs := make([]*btcutil.Tx, len(msgs))
for i, msg := range msgs {
tx := btcutil.NewTx(msg)
tx.SetIndex(i)
txs[i] = tx
}
return txs
}