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cardatatransfer.go
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cardatatransfer.go
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package cardatatransfer
import (
"errors"
"fmt"
datatransfer "github.com/filecoin-project/go-data-transfer/v2"
dtgs "github.com/filecoin-project/go-data-transfer/v2/transport/graphsync"
retrievaltypes "github.com/filecoin-project/go-retrieval-types"
"github.com/ipfs/go-cid"
"github.com/ipfs/go-graphsync/storeutil"
logging "github.com/ipfs/go-log/v2"
"github.com/ipld/go-ipld-prime"
"github.com/ipld/go-ipld-prime/datamodel"
selectorparse "github.com/ipld/go-ipld-prime/traversal/selector/parse"
"github.com/ipni/go-libipni/metadata"
"github.com/ipni/index-provider/cardatatransfer/stores"
"github.com/ipni/index-provider/supplier"
peer "github.com/libp2p/go-libp2p/core/peer"
"github.com/multiformats/go-multicodec"
"github.com/multiformats/go-multihash"
)
var log = logging.Logger("car-data-transfer")
type ProviderDealID struct {
DealID retrievaltypes.DealID
Receiver peer.ID
}
func (p ProviderDealID) String() string {
return fmt.Sprintf("%v/%v", p.Receiver, p.DealID)
}
type BlockStoreSupplier interface {
ReadOnlyBlockstore(contextID []byte) (supplier.ClosableBlockstore, error)
}
type carDataTransfer struct {
dt datatransfer.Manager
supplier BlockStoreSupplier
stores *stores.ReadOnlyBlockstores
}
func StartCarDataTransfer(dt datatransfer.Manager, supplier BlockStoreSupplier) error {
cdt := &carDataTransfer{
dt: dt,
supplier: supplier,
stores: stores.NewReadOnlyBlockstores(),
}
err := dt.RegisterVoucherType(retrievaltypes.DealProposalType, cdt)
if err != nil {
return err
}
err = dt.RegisterTransportConfigurer(retrievaltypes.DealProposalType, cdt.transportConfigurer)
if err != nil {
return err
}
dt.SubscribeToEvents(cdt.eventListener)
return nil
}
func TransportFromContextID(contextID []byte) (metadata.Protocol, error) {
pieceCid, err := cid.Prefix{
Version: 1,
Codec: uint64(multicodec.TransportGraphsyncFilecoinv1),
MhType: multihash.IDENTITY,
MhLength: -1,
}.Sum(contextID)
if err != nil {
return nil, err
}
return &metadata.GraphsyncFilecoinV1{
PieceCID: pieceCid,
VerifiedDeal: true,
FastRetrieval: true,
}, nil
}
// ValidatePush validates a push request received from the peer that will send data
func (cdt *carDataTransfer) ValidatePush(_ datatransfer.ChannelID, sender peer.ID, voucher datamodel.Node, baseCid cid.Cid, selector ipld.Node) (datatransfer.ValidationResult, error) {
return datatransfer.ValidationResult{}, errors.New("no pushes accepted")
}
func rejectProposal(proposal *retrievaltypes.DealProposal, status retrievaltypes.DealStatus, reason string) (datatransfer.ValidationResult, error) {
vr := (&retrievaltypes.DealResponse{
ID: proposal.ID,
Status: status,
Message: reason,
}).AsVoucher()
return datatransfer.ValidationResult{
Accepted: false,
VoucherResult: &vr,
}, nil
}
// ValidatePull validates a pull request received from the peer that will receive data
func (cdt *carDataTransfer) ValidatePull(_ datatransfer.ChannelID, receiver peer.ID, voucher datamodel.Node, baseCid cid.Cid, selector ipld.Node) (datatransfer.ValidationResult, error) {
proposal, err := retrievaltypes.DealProposalFromNode(voucher)
if err != nil {
return datatransfer.ValidationResult{}, err
}
// Check the proposal CID matches
if proposal.PayloadCID != baseCid {
return rejectProposal(proposal, retrievaltypes.DealStatusRejected, "incorrect CID for this proposal")
}
// Check the proposal selector matches
sel := selectorparse.CommonSelector_ExploreAllRecursively
if proposal.SelectorSpecified() {
sel = proposal.Selector.Node
}
if !ipld.DeepEqual(sel, selector) {
return rejectProposal(proposal, retrievaltypes.DealStatusRejected, "incorrect selector specified for this proposal")
}
// attempt to setup the deal
providerDealID := ProviderDealID{DealID: proposal.ID, Receiver: receiver}
status, err := cdt.attemptAcceptDeal(providerDealID, proposal)
response := retrievaltypes.DealResponse{
ID: proposal.ID,
Status: status,
}
accepted := true
if err != nil {
response.Message = err.Error()
accepted = false
}
vr := response.AsVoucher()
return datatransfer.ValidationResult{
Accepted: accepted,
VoucherResult: &vr,
}, nil
}
func (cdt *carDataTransfer) ValidateRestart(channelID datatransfer.ChannelID, channelState datatransfer.ChannelState) (datatransfer.ValidationResult, error) {
voucher := channelState.Voucher()
proposal, err := retrievaltypes.DealProposalFromNode(voucher.Voucher)
if err != nil {
return datatransfer.ValidationResult{}, errors.New("wrong voucher type")
}
providerDealID := ProviderDealID{DealID: proposal.ID, Receiver: channelState.OtherPeer()}
status, err := cdt.attemptAcceptDeal(providerDealID, proposal)
response := retrievaltypes.DealResponse{
ID: proposal.ID,
Status: status,
}
accepted := true
if err != nil {
response.Message = err.Error()
accepted = false
}
vr := response.AsVoucher()
return datatransfer.ValidationResult{
Accepted: accepted,
VoucherResult: &vr,
}, nil
}
func (cdt *carDataTransfer) attemptAcceptDeal(providerDealID ProviderDealID, proposal *retrievaltypes.DealProposal) (retrievaltypes.DealStatus, error) {
if proposal.PieceCID == nil {
return retrievaltypes.DealStatusErrored, errors.New("must specific piece CID")
}
// get contextID
prefix := proposal.PieceCID.Prefix()
if prefix.Codec != uint64(multicodec.TransportGraphsyncFilecoinv1) {
return retrievaltypes.DealStatusErrored, errors.New("incorrect Piece CID codec")
}
if prefix.MhType != multihash.IDENTITY {
return retrievaltypes.DealStatusErrored, errors.New("piece CID must be an identity CI")
}
dmh, err := multihash.Decode(proposal.PieceCID.Hash())
if err != nil {
return retrievaltypes.DealStatusErrored, errors.New("unable to decode piece CID")
}
contextID := dmh.Digest
// read blockstore from supplier
bs, err := cdt.supplier.ReadOnlyBlockstore(contextID)
if err != nil {
return retrievaltypes.DealStatusErrored, fmt.Errorf("error reading blockstore: %w", err)
}
cdt.stores.Track(providerDealID.String(), bs)
return retrievaltypes.DealStatusAccepted, nil
}
func checkTermination(event datatransfer.Event, channelState datatransfer.ChannelState) bool {
return channelState.Status() == datatransfer.Completed ||
event.Code == datatransfer.Disconnected ||
event.Code == datatransfer.Error ||
event.Code == datatransfer.Cancel
}
func (cdt *carDataTransfer) eventListener(event datatransfer.Event, channelState datatransfer.ChannelState) {
dealProposal, err := retrievaltypes.DealProposalFromNode(channelState.Voucher().Voucher)
// if this event is for a transfer not related to storage, ignore
if err != nil {
return
}
providerDealID := ProviderDealID{DealID: dealProposal.ID, Receiver: channelState.Recipient()}
if checkTermination(event, channelState) {
err := cdt.stores.Untrack(providerDealID.String())
if err != nil {
log.Errorf("termination error: %s", err)
}
}
}
// StoreConfigurableTransport defines the methods needed to
// configure a data transfer transport use a unique store for a given request
type StoreConfigurableTransport interface {
UseStore(datatransfer.ChannelID, ipld.LinkSystem) error
}
func (ctd *carDataTransfer) transportConfigurer(channelID datatransfer.ChannelID, voucher datatransfer.TypedVoucher) []datatransfer.TransportOption {
dealProposal, err := retrievaltypes.DealProposalFromNode(voucher.Voucher)
if err != nil {
return nil
}
providerDealID := ProviderDealID{Receiver: channelID.Initiator, DealID: dealProposal.ID}
store, err := ctd.stores.Get(providerDealID.String())
if err != nil {
log.Errorf("attempting to configure data store: %s", err)
return nil
}
if store == nil {
return nil
}
return []datatransfer.TransportOption{dtgs.UseStore(storeutil.LinkSystemForBlockstore(store))}
}