forked from cerc-io/ipld-eth-server
231 lines
7.1 KiB
Go
231 lines
7.1 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 ipfs
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import (
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"context"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ipfs/go-block-format"
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"github.com/ipfs/go-blockservice"
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"github.com/ipfs/go-cid"
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log "github.com/sirupsen/logrus"
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)
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// IPLDFetcher is an interface for fetching IPLDs
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type IPLDFetcher interface {
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FetchIPLDs(cids CIDWrapper) (*IPLDWrapper, error)
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}
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// EthIPLDFetcher is used to fetch ETH IPLD objects from IPFS
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type EthIPLDFetcher struct {
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BlockService blockservice.BlockService
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}
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// NewIPLDFetcher creates a pointer to a new IPLDFetcher
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func NewIPLDFetcher(ipfsPath string) (*EthIPLDFetcher, error) {
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blockService, err := InitIPFSBlockService(ipfsPath)
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if err != nil {
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return nil, err
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}
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return &EthIPLDFetcher{
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BlockService: blockService,
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}, nil
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}
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// FetchIPLDs is the exported method for fetching and returning all the IPLDS specified in the CIDWrapper
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func (f *EthIPLDFetcher) FetchIPLDs(cids CIDWrapper) (*IPLDWrapper, error) {
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log.Debug("fetching iplds")
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blocks := &IPLDWrapper{
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BlockNumber: cids.BlockNumber,
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Headers: make([]blocks.Block, 0),
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Uncles: make([]blocks.Block, 0),
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Transactions: make([]blocks.Block, 0),
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Receipts: make([]blocks.Block, 0),
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StateNodes: make(map[common.Hash]blocks.Block),
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StorageNodes: make(map[common.Hash]map[common.Hash]blocks.Block),
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}
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headersErr := f.fetchHeaders(cids, blocks)
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if headersErr != nil {
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return nil, headersErr
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}
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unclesErr := f.fetchUncles(cids, blocks)
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if unclesErr != nil {
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return nil, unclesErr
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}
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trxsErr := f.fetchTrxs(cids, blocks)
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if trxsErr != nil {
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return nil, trxsErr
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}
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rctsErr := f.fetchRcts(cids, blocks)
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if rctsErr != nil {
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return nil, rctsErr
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}
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storageErr := f.fetchStorage(cids, blocks)
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if storageErr != nil {
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return nil, storageErr
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}
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stateErr := f.fetchState(cids, blocks)
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if stateErr != nil {
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return nil, stateErr
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}
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return blocks, nil
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}
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// fetchHeaders fetches headers
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// It uses the f.fetchBatch method
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func (f *EthIPLDFetcher) fetchHeaders(cids CIDWrapper, blocks *IPLDWrapper) error {
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log.Debug("fetching header iplds")
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headerCids := make([]cid.Cid, 0, len(cids.Headers))
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for _, c := range cids.Headers {
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dc, err := cid.Decode(c)
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if err != nil {
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return err
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}
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headerCids = append(headerCids, dc)
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}
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blocks.Headers = f.fetchBatch(headerCids)
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if len(blocks.Headers) != len(headerCids) {
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log.Errorf("ipfs fetcher: number of header blocks returned (%d) does not match number expected (%d)", len(blocks.Headers), len(headerCids))
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}
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return nil
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}
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// fetchUncles fetches uncles
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// It uses the f.fetchBatch method
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func (f *EthIPLDFetcher) fetchUncles(cids CIDWrapper, blocks *IPLDWrapper) error {
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log.Debug("fetching uncle iplds")
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uncleCids := make([]cid.Cid, 0, len(cids.Uncles))
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for _, c := range cids.Uncles {
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dc, err := cid.Decode(c)
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if err != nil {
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return err
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}
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uncleCids = append(uncleCids, dc)
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}
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blocks.Uncles = f.fetchBatch(uncleCids)
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if len(blocks.Uncles) != len(uncleCids) {
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log.Errorf("ipfs fetcher: number of uncle blocks returned (%d) does not match number expected (%d)", len(blocks.Uncles), len(uncleCids))
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}
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return nil
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}
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// fetchTrxs fetches transactions
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// It uses the f.fetchBatch method
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func (f *EthIPLDFetcher) fetchTrxs(cids CIDWrapper, blocks *IPLDWrapper) error {
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log.Debug("fetching transaction iplds")
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trxCids := make([]cid.Cid, 0, len(cids.Transactions))
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for _, c := range cids.Transactions {
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dc, err := cid.Decode(c)
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if err != nil {
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return err
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}
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trxCids = append(trxCids, dc)
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}
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blocks.Transactions = f.fetchBatch(trxCids)
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if len(blocks.Transactions) != len(trxCids) {
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log.Errorf("ipfs fetcher: number of transaction blocks returned (%d) does not match number expected (%d)", len(blocks.Transactions), len(trxCids))
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}
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return nil
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}
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// fetchRcts fetches receipts
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// It uses the f.fetchBatch method
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func (f *EthIPLDFetcher) fetchRcts(cids CIDWrapper, blocks *IPLDWrapper) error {
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log.Debug("fetching receipt iplds")
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rctCids := make([]cid.Cid, 0, len(cids.Receipts))
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for _, c := range cids.Receipts {
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dc, err := cid.Decode(c)
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if err != nil {
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return err
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}
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rctCids = append(rctCids, dc)
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}
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blocks.Receipts = f.fetchBatch(rctCids)
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if len(blocks.Receipts) != len(rctCids) {
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log.Errorf("ipfs fetcher: number of receipt blocks returned (%d) does not match number expected (%d)", len(blocks.Receipts), len(rctCids))
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}
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return nil
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}
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// fetchState fetches state nodes
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// It uses the single f.fetch method instead of the batch fetch, because it
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// needs to maintain the data's relation to state keys
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func (f *EthIPLDFetcher) fetchState(cids CIDWrapper, blocks *IPLDWrapper) error {
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log.Debug("fetching state iplds")
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for _, stateNode := range cids.StateNodes {
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if stateNode.CID == "" || stateNode.Key == "" {
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continue
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}
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dc, decodeErr := cid.Decode(stateNode.CID)
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if decodeErr != nil {
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return decodeErr
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}
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block, fetchErr := f.fetch(dc)
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if fetchErr != nil {
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return fetchErr
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}
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blocks.StateNodes[common.HexToHash(stateNode.Key)] = block
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}
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return nil
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}
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// fetchStorage fetches storage nodes
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// It uses the single f.fetch method instead of the batch fetch, because it
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// needs to maintain the data's relation to state and storage keys
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func (f *EthIPLDFetcher) fetchStorage(cids CIDWrapper, blks *IPLDWrapper) error {
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log.Debug("fetching storage iplds")
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for _, storageNode := range cids.StorageNodes {
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if storageNode.CID == "" || storageNode.Key == "" || storageNode.StateKey == "" {
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continue
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}
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dc, decodeErr := cid.Decode(storageNode.CID)
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if decodeErr != nil {
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return decodeErr
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}
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blk, fetchErr := f.fetch(dc)
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if fetchErr != nil {
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return fetchErr
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}
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if blks.StorageNodes[common.HexToHash(storageNode.StateKey)] == nil {
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blks.StorageNodes[common.HexToHash(storageNode.StateKey)] = make(map[common.Hash]blocks.Block)
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}
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blks.StorageNodes[common.HexToHash(storageNode.StateKey)][common.HexToHash(storageNode.Key)] = blk
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}
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return nil
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}
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// fetch is used to fetch a single cid
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func (f *EthIPLDFetcher) fetch(cid cid.Cid) (blocks.Block, error) {
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return f.BlockService.GetBlock(context.Background(), cid)
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}
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// fetchBatch is used to fetch a batch of IPFS data blocks by cid
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// There is no guarantee all are fetched, and no error in such a case, so
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// downstream we will need to confirm which CIDs were fetched in the result set
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func (f *EthIPLDFetcher) fetchBatch(cids []cid.Cid) []blocks.Block {
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fetchedBlocks := make([]blocks.Block, 0, len(cids))
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blockChan := f.BlockService.GetBlocks(context.Background(), cids)
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for block := range blockChan {
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fetchedBlocks = append(fetchedBlocks, block)
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}
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return fetchedBlocks
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}
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