forked from cerc-io/ipld-eth-server
108 lines
3.0 KiB
Go
108 lines
3.0 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/jmoiron/sqlx"
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log "github.com/sirupsen/logrus"
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"github.com/vulcanize/ipfs-blockchain-watcher/pkg/ipfs"
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"github.com/vulcanize/ipfs-blockchain-watcher/pkg/postgres"
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"github.com/vulcanize/ipfs-blockchain-watcher/pkg/shared"
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)
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// IPLDPGFetcher satisfies the IPLDFetcher interface for ethereum
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// it interfaces directly with PG-IPFS instead of going through a node-interface or remote node
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type IPLDPGFetcher struct {
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db *postgres.DB
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}
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// NewIPLDPGFetcher creates a pointer to a new IPLDPGFetcher
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func NewIPLDPGFetcher(db *postgres.DB) *IPLDPGFetcher {
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return &IPLDPGFetcher{
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db: db,
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}
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}
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// Fetch is the exported method for fetching and returning all the IPLDS specified in the CIDWrapper
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func (f *IPLDPGFetcher) Fetch(cids shared.CIDsForFetching) (shared.IPLDs, error) {
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cidWrapper, ok := cids.(*CIDWrapper)
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if !ok {
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return nil, fmt.Errorf("btc fetcher: expected cids type %T got %T", &CIDWrapper{}, cids)
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}
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log.Debug("fetching iplds")
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iplds := IPLDs{}
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iplds.BlockNumber = cidWrapper.BlockNumber
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tx, err := f.db.Beginx()
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if err != nil {
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return nil, err
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}
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defer func() {
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if p := recover(); p != nil {
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shared.Rollback(tx)
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panic(p)
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} else if err != nil {
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shared.Rollback(tx)
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} else {
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err = tx.Commit()
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}
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}()
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iplds.Header, err = f.FetchHeader(tx, cidWrapper.Header)
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if err != nil {
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return nil, fmt.Errorf("btc pg fetcher: header fetching error: %s", err.Error())
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}
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iplds.Transactions, err = f.FetchTrxs(tx, cidWrapper.Transactions)
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if err != nil {
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return nil, fmt.Errorf("btc pg fetcher: transaction fetching error: %s", err.Error())
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}
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return iplds, err
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}
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// FetchHeaders fetches headers
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func (f *IPLDPGFetcher) FetchHeader(tx *sqlx.Tx, c HeaderModel) (ipfs.BlockModel, error) {
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log.Debug("fetching header ipld")
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headerBytes, err := shared.FetchIPLD(tx, c.CID)
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if err != nil {
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return ipfs.BlockModel{}, err
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}
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return ipfs.BlockModel{
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Data: headerBytes,
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CID: c.CID,
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}, nil
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}
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// FetchTrxs fetches transactions
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func (f *IPLDPGFetcher) FetchTrxs(tx *sqlx.Tx, cids []TxModel) ([]ipfs.BlockModel, error) {
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log.Debug("fetching transaction iplds")
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trxIPLDs := make([]ipfs.BlockModel, len(cids))
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for i, c := range cids {
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trxBytes, err := shared.FetchIPLD(tx, c.CID)
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if err != nil {
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return nil, err
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}
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trxIPLDs[i] = ipfs.BlockModel{
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Data: trxBytes,
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CID: c.CID,
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}
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}
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return trxIPLDs, nil
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}
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