forked from cerc-io/ipld-eth-server
65 lines
2.1 KiB
Go
65 lines
2.1 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/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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)
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// IPLDFetcher is the interface for fetching IPLD objects from IPFS
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type IPLDFetcher interface {
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Fetch(cid cid.Cid) (blocks.Block, error)
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FetchBatch(cids []cid.Cid) []blocks.Block
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}
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// Fetcher is the underlying struct which supports the IPLDFetcher interface
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type Fetcher struct {
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BlockService blockservice.BlockService
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}
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// NewIPLDFetcher creates a pointer to a new Fetcher which satisfies the IPLDFetcher interface
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func NewIPLDFetcher(ipfsPath string) (*Fetcher, 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 &Fetcher{
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BlockService: blockService,
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}, nil
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}
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// Fetch is used to fetch a batch of IPFS data blocks by cid
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func (f *Fetcher) 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 *Fetcher) 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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