ipld-eth-server/pkg/super_node/eth/ipld_fetcher.go

235 lines
7.3 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 eth
import (
"context"
"errors"
"fmt"
"github.com/ethereum/go-ethereum/common"
"github.com/ipfs/go-block-format"
"github.com/ipfs/go-blockservice"
"github.com/ipfs/go-cid"
log "github.com/sirupsen/logrus"
"github.com/vulcanize/vulcanizedb/pkg/ipfs"
)
var (
errUnexpectedNumberOfIPLDs = errors.New("ipfs batch fetch returned unexpected number of IPLDs")
)
// IPLDFetcher satisfies the IPLDFetcher interface for ethereum
type IPLDFetcher struct {
BlockService blockservice.BlockService
}
// NewIPLDFetcher creates a pointer to a new IPLDFetcher
func NewIPLDFetcher(ipfsPath string) (*IPLDFetcher, error) {
blockService, err := ipfs.InitIPFSBlockService(ipfsPath)
if err != nil {
return nil, err
}
return &IPLDFetcher{
BlockService: blockService,
}, nil
}
// Fetch is the exported method for fetching and returning all the IPLDS specified in the CIDWrapper
func (f *IPLDFetcher) Fetch(cids interface{}) (interface{}, error) {
cidWrapper, ok := cids.(*CIDWrapper)
if !ok {
return nil, fmt.Errorf("eth fetcher: expected cids type %T got %T", &CIDWrapper{}, cids)
}
log.Debug("fetching iplds")
iplds := new(IPLDWrapper)
iplds.BlockNumber = cidWrapper.BlockNumber
var err error
iplds.Headers, err = f.FetchHeaders(cidWrapper.Headers)
if err != nil {
return nil, err
}
iplds.Uncles, err = f.FetchUncles(cidWrapper.Uncles)
if err != nil {
return nil, err
}
iplds.Transactions, err = f.FetchTrxs(cidWrapper.Transactions)
if err != nil {
return nil, err
}
iplds.Receipts, err = f.FetchRcts(cidWrapper.Receipts)
if err != nil {
return nil, err
}
iplds.StateNodes, err = f.FetchState(cidWrapper.StateNodes)
if err != nil {
return nil, err
}
iplds.StorageNodes, err = f.FetchStorage(cidWrapper.StorageNodes)
if err != nil {
return nil, err
}
return iplds, nil
}
// FetchHeaders fetches headers
// It uses the f.fetchBatch method
func (f *IPLDFetcher) FetchHeaders(cids []HeaderModel) ([]blocks.Block, error) {
log.Debug("fetching header iplds")
headerCids := make([]cid.Cid, 0, len(cids))
for _, c := range cids {
dc, err := cid.Decode(c.CID)
if err != nil {
return nil, err
}
headerCids = append(headerCids, dc)
}
headers := f.fetchBatch(headerCids)
if len(headers) != len(headerCids) {
log.Errorf("ipfs fetcher: number of header blocks returned (%d) does not match number expected (%d)", len(headers), len(headerCids))
return headers, errUnexpectedNumberOfIPLDs
}
return headers, nil
}
// FetchUncles fetches uncles
// It uses the f.fetchBatch method
func (f *IPLDFetcher) FetchUncles(cids []HeaderModel) ([]blocks.Block, error) {
log.Debug("fetching uncle iplds")
uncleCids := make([]cid.Cid, 0, len(cids))
for _, c := range cids {
dc, err := cid.Decode(c.CID)
if err != nil {
return nil, err
}
uncleCids = append(uncleCids, dc)
}
uncles := f.fetchBatch(uncleCids)
if len(uncles) != len(uncleCids) {
log.Errorf("ipfs fetcher: number of uncle blocks returned (%d) does not match number expected (%d)", len(uncles), len(uncleCids))
return uncles, errUnexpectedNumberOfIPLDs
}
return uncles, nil
}
// FetchTrxs fetches transactions
// It uses the f.fetchBatch method
func (f *IPLDFetcher) FetchTrxs(cids []TxModel) ([]blocks.Block, error) {
log.Debug("fetching transaction iplds")
trxCids := make([]cid.Cid, 0, len(cids))
for _, c := range cids {
dc, err := cid.Decode(c.CID)
if err != nil {
return nil, err
}
trxCids = append(trxCids, dc)
}
trxs := f.fetchBatch(trxCids)
if len(trxs) != len(trxCids) {
log.Errorf("ipfs fetcher: number of transaction blocks returned (%d) does not match number expected (%d)", len(trxs), len(trxCids))
return trxs, errUnexpectedNumberOfIPLDs
}
return trxs, nil
}
// FetchRcts fetches receipts
// It uses the f.fetchBatch method
func (f *IPLDFetcher) FetchRcts(cids []ReceiptModel) ([]blocks.Block, error) {
log.Debug("fetching receipt iplds")
rctCids := make([]cid.Cid, 0, len(cids))
for _, c := range cids {
dc, err := cid.Decode(c.CID)
if err != nil {
return nil, err
}
rctCids = append(rctCids, dc)
}
rcts := f.fetchBatch(rctCids)
if len(rcts) != len(rctCids) {
log.Errorf("ipfs fetcher: number of receipt blocks returned (%d) does not match number expected (%d)", len(rcts), len(rctCids))
return rcts, errUnexpectedNumberOfIPLDs
}
return rcts, nil
}
// FetchState fetches state nodes
// It uses the single f.fetch method instead of the batch fetch, because it
// needs to maintain the data's relation to state keys
func (f *IPLDFetcher) FetchState(cids []StateNodeModel) (map[common.Hash]blocks.Block, error) {
log.Debug("fetching state iplds")
stateNodes := make(map[common.Hash]blocks.Block)
for _, stateNode := range cids {
if stateNode.CID == "" || stateNode.StateKey == "" {
continue
}
dc, err := cid.Decode(stateNode.CID)
if err != nil {
return nil, err
}
state, err := f.fetch(dc)
if err != nil {
return nil, err
}
stateNodes[common.HexToHash(stateNode.StateKey)] = state
}
return stateNodes, nil
}
// FetchStorage fetches storage nodes
// It uses the single f.fetch method instead of the batch fetch, because it
// needs to maintain the data's relation to state and storage keys
func (f *IPLDFetcher) FetchStorage(cids []StorageNodeWithStateKeyModel) (map[common.Hash]map[common.Hash]blocks.Block, error) {
log.Debug("fetching storage iplds")
storageNodes := make(map[common.Hash]map[common.Hash]blocks.Block)
for _, storageNode := range cids {
if storageNode.CID == "" || storageNode.StorageKey == "" || storageNode.StateKey == "" {
continue
}
dc, err := cid.Decode(storageNode.CID)
if err != nil {
return nil, err
}
storage, err := f.fetch(dc)
if err != nil {
return nil, err
}
if storageNodes[common.HexToHash(storageNode.StateKey)] == nil {
storageNodes[common.HexToHash(storageNode.StateKey)] = make(map[common.Hash]blocks.Block)
}
storageNodes[common.HexToHash(storageNode.StateKey)][common.HexToHash(storageNode.StorageKey)] = storage
}
return storageNodes, nil
}
// fetch is used to fetch a single cid
func (f *IPLDFetcher) fetch(cid cid.Cid) (blocks.Block, error) {
return f.BlockService.GetBlock(context.Background(), cid)
}
// fetchBatch is used to fetch a batch of IPFS data blocks by cid
// There is no guarantee all are fetched, and no error in such a case, so
// downstream we will need to confirm which CIDs were fetched in the result set
func (f *IPLDFetcher) fetchBatch(cids []cid.Cid) []blocks.Block {
fetchedBlocks := make([]blocks.Block, 0, len(cids))
blockChan := f.BlockService.GetBlocks(context.Background(), cids)
for block := range blockChan {
fetchedBlocks = append(fetchedBlocks, block)
}
return fetchedBlocks
}