mirror of
https://github.com/anyproto/any-sync.git
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88 lines
2.2 KiB
Go
88 lines
2.2 KiB
Go
package fileservice
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import (
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"context"
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"fmt"
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"github.com/anytypeio/any-sync/app"
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"github.com/anytypeio/any-sync/app/logger"
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"github.com/anytypeio/any-sync/commonfile/fileblockstore"
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"github.com/ipfs/go-cid"
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chunker "github.com/ipfs/go-ipfs-chunker"
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ipld "github.com/ipfs/go-ipld-format"
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"github.com/ipfs/go-merkledag"
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"github.com/ipfs/go-unixfs/importer/balanced"
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"github.com/ipfs/go-unixfs/importer/helpers"
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ufsio "github.com/ipfs/go-unixfs/io"
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"github.com/multiformats/go-multihash"
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"go.uber.org/zap"
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"io"
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)
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const CName = "common.commonfile.fileservice"
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var log = logger.NewNamed(CName)
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func New() FileService {
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return &fileService{}
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}
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type FileService interface {
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// GetFile gets file from ipfs storage
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GetFile(ctx context.Context, c cid.Cid) (ufsio.ReadSeekCloser, error)
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// AddFile adds file to ipfs storage
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AddFile(ctx context.Context, r io.Reader) (ipld.Node, error)
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app.Component
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}
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type fileService struct {
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merkledag ipld.DAGService
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prefix cid.Prefix
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}
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func (fs *fileService) Init(a *app.App) (err error) {
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prefix, err := merkledag.PrefixForCidVersion(1)
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if err != nil {
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return fmt.Errorf("bad CID Version: %s", err)
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}
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hashFunCode, ok := multihash.Names["sha2-256"]
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if !ok {
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return fmt.Errorf("unrecognized hash function")
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}
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prefix.MhType = hashFunCode
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prefix.MhLength = -1
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bs := newBlockService(a.MustComponent(fileblockstore.CName).(fileblockstore.BlockStore))
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fs.merkledag = merkledag.NewDAGService(bs)
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fs.prefix = prefix
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return
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}
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func (fs *fileService) Name() string {
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return CName
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}
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func (fs *fileService) AddFile(ctx context.Context, r io.Reader) (ipld.Node, error) {
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dbp := helpers.DagBuilderParams{
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Dagserv: fs.merkledag,
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Maxlinks: helpers.DefaultLinksPerBlock,
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CidBuilder: &fs.prefix,
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}
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dbh, err := dbp.New(chunker.DefaultSplitter(r))
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if err != nil {
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return nil, err
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}
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n, err := balanced.Layout(dbh)
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if err != nil {
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return nil, err
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}
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log.Debug("add file", zap.String("cid", n.Cid().String()))
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return n, nil
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}
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func (fs *fileService) GetFile(ctx context.Context, c cid.Cid) (ufsio.ReadSeekCloser, error) {
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log.Debug("get file", zap.String("cid", c.String()))
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n, err := fs.merkledag.Get(ctx, c)
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if err != nil {
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return nil, err
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}
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return ufsio.NewDagReader(ctx, n, fs.merkledag)
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}
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