59 lines
1.9 KiB
Go
59 lines
1.9 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 ipfs
|
|
|
|
import (
|
|
"context"
|
|
|
|
"github.com/ipfs/go-block-format"
|
|
"github.com/ipfs/go-blockservice"
|
|
"github.com/ipfs/go-cid"
|
|
)
|
|
|
|
// IPLDFetcher is the underlying struct which supports a IPLD fetching interface
|
|
type IPLDFetcher struct {
|
|
BlockService blockservice.BlockService
|
|
}
|
|
|
|
// NewIPLDFetcher creates a pointer to a new IPLDFetcher
|
|
func NewIPLDFetcher(ipfsPath string) (*IPLDFetcher, error) {
|
|
blockService, err := InitIPFSBlockService(ipfsPath)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &IPLDFetcher{
|
|
BlockService: blockService,
|
|
}, nil
|
|
}
|
|
|
|
// Fetch is used to fetch a single block of IPFS data by 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
|
|
}
|