94 lines
2.2 KiB
Go
94 lines
2.2 KiB
Go
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package state
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import (
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"context"
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"github.com/filecoin-project/lotus/api"
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"github.com/filecoin-project/lotus/lib/blockstore"
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"github.com/filecoin-project/specs-actors/actors/util/adt"
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blocks "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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ds "github.com/ipfs/go-datastore"
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exchange "github.com/ipfs/go-ipfs-exchange-interface"
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offline "github.com/ipfs/go-ipfs-exchange-offline"
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cbor "github.com/ipfs/go-ipld-cbor"
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format "github.com/ipfs/go-ipld-format"
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"github.com/ipfs/go-merkledag"
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)
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// ProxyingStores implements the ipld store where unknown items are fetched over the node API.
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type ProxyingStores struct {
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CBORStore cbor.IpldStore
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ADTStore adt.Store
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Datastore ds.Batching
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Blockstore blockstore.Blockstore
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BlockService blockservice.BlockService
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Exchange exchange.Interface
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DAGService format.DAGService
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}
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type proxyingBlockstore struct {
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ctx context.Context
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api api.FullNode
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blockstore.Blockstore
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}
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func (pb *proxyingBlockstore) Get(cid cid.Cid) (blocks.Block, error) {
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if block, err := pb.Blockstore.Get(cid); err == nil {
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return block, err
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}
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// fmt.Printf("fetching cid via rpc: %v\n", cid)
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item, err := pb.api.ChainReadObj(pb.ctx, cid)
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if err != nil {
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return nil, err
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}
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block, err := blocks.NewBlockWithCid(item, cid)
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if err != nil {
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return nil, err
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}
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err = pb.Blockstore.Put(block)
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if err != nil {
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return nil, err
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}
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return block, nil
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}
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// NewProxyingStore is a blockstore that proxies get requests for unknown CIDs
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// to a Filecoin node, via the ChainReadObj RPC.
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//
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// It also contains all possible stores, services and gadget that IPLD
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// requires (quite a handful).
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func NewProxyingStore(ctx context.Context, api api.FullNode) *ProxyingStores {
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ds := ds.NewMapDatastore()
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bs := &proxyingBlockstore{
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ctx: ctx,
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api: api,
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Blockstore: blockstore.NewBlockstore(ds),
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}
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var (
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cborstore = cbor.NewCborStore(bs)
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offl = offline.Exchange(bs)
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blkserv = blockservice.New(bs, offl)
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dserv = merkledag.NewDAGService(blkserv)
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)
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return &ProxyingStores{
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CBORStore: cborstore,
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ADTStore: adt.WrapStore(ctx, cborstore),
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Datastore: ds,
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Blockstore: bs,
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Exchange: offl,
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BlockService: blkserv,
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DAGService: dserv,
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}
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}
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