80 lines
2.7 KiB
Go
80 lines
2.7 KiB
Go
package datatransfer
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import (
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"context"
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"reflect"
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"github.com/ipfs/go-cid"
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ipldformat "github.com/ipfs/go-ipld-format"
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"github.com/ipfs/go-merkledag"
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ipld "github.com/ipld/go-ipld-prime"
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"github.com/libp2p/go-libp2p-core/peer"
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"golang.org/x/xerrors"
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)
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// This file implements a VERY simple, incomplete version of the data transfer
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// module that allows us to make the neccesary insertions of data transfer
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// functionality into the storage market
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// It does not:
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// -- actually validate requests
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// -- support Push requests
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// -- support multiple subscribers
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// -- do any actual network coordination or use Graphsync
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type dagserviceImpl struct {
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dag ipldformat.DAGService
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subscriber Subscriber
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}
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// NewDAGServiceDataTransfer returns a data transfer manager based on
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// an IPLD DAGService
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func NewDAGServiceDataTransfer(dag ipldformat.DAGService) Manager {
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return &dagserviceImpl{dag, nil}
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}
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// RegisterVoucherType registers a validator for the given voucher type
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// will error if voucher type does not implement voucher
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// or if there is a voucher type registered with an identical identifier
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func (impl *dagserviceImpl) RegisterVoucherType(voucherType reflect.Type, validator RequestValidator) error {
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return nil
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}
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// open a data transfer that will send data to the recipient peer and
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// open a data transfer that will send data to the recipient peer and
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// transfer parts of the piece that match the selector
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func (impl *dagserviceImpl) OpenPushDataChannel(ctx context.Context, to peer.ID, voucher Voucher, baseCid cid.Cid, Selector ipld.Node) (ChannelID, error) {
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return ChannelID{}, xerrors.Errorf("not implemented")
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}
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// open a data transfer that will request data from the sending peer and
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// transfer parts of the piece that match the selector
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func (impl *dagserviceImpl) OpenPullDataChannel(ctx context.Context, to peer.ID, voucher Voucher, baseCid cid.Cid, Selector ipld.Node) (ChannelID, error) {
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ctx, cancel := context.WithCancel(ctx)
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go func() {
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defer cancel()
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err := merkledag.FetchGraph(ctx, baseCid, impl.dag)
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var event Event
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if err != nil {
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event = Error
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} else {
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event = Complete
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}
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impl.subscriber(event, ChannelState{Channel: Channel{voucher: voucher}})
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}()
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return ChannelID{}, nil
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}
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// close an open channel (effectively a cancel)
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func (impl *dagserviceImpl) CloseDataTransferChannel(x ChannelID) {}
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// get status of a transfer
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func (impl *dagserviceImpl) TransferChannelStatus(x ChannelID) Status { return ChannelNotFoundError }
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// get notified when certain types of events happen
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func (impl *dagserviceImpl) SubscribeToEvents(subscriber Subscriber) {
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impl.subscriber = subscriber
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}
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// get all in progress transfers
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func (impl *dagserviceImpl) InProgressChannels() map[ChannelID]ChannelState { return nil }
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