fix!: move block event reporting to bitswap's blockstore

BREAKING CHANGE because the signature of NewByteCountingLinkSystem has changed
to include a peer.ID.

We need to report BlockReceived events from the immediate blockstore that
bitswap writes to so we don't incur a delay and have our preload cache race
to report it's got the block before our "loader" has time to register it has
it.

pkg/retriever/bitswaphelpers/countinglinksystem.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/ipld/go-ipld-prime/datamodel"
 	"github.com/ipld/go-ipld-prime/linking"
+	"github.com/libp2p/go-libp2p/core/peer"
 )
 
 type cumulativeCountWriter struct {
@@ -32,15 +33,19 @@ func (ccw *cumulativeCountWriter) Commit(link datamodel.Link) error {
 	return nil
 }
 
-func NewByteCountingLinkSystem(lsys *linking.LinkSystem, bytesWritten func(count uint64)) *linking.LinkSystem {
+func NewByteCountingLinkSystem(lsys *linking.LinkSystem, blockWritten func(from *peer.ID, count uint64)) *linking.LinkSystem {
 	newLsys := *lsys // copy all values from old system
 	oldWriteOpener := lsys.StorageWriteOpener
 	newLsys.StorageWriteOpener = func(lctx linking.LinkContext) (io.Writer, linking.BlockWriteCommitter, error) {
+		var from *peer.ID = nil
+		if p, ok := lctx.Ctx.Value(peerIdContextKey).(peer.ID); ok {
+			from = &p
+		}
 		w, committer, err := oldWriteOpener(lctx)
 		if err != nil {
 			return w, committer, err
 		}
-		ccw := &cumulativeCountWriter{w, 0, committer, bytesWritten}
+		ccw := &cumulativeCountWriter{w, 0, committer, func(count uint64) { blockWritten(from, count) }}
 		return ccw, ccw.Commit, err
 	}
 	return &newLsys

pkg/retriever/bitswaphelpers/multiblockstore.go

@@ -7,6 +7,7 @@ import (
 	"sync"
 
 	"github.com/filecoin-project/lassie/pkg/types"
+	"github.com/ipfs/boxo/bitswap/client/traceability"
 	blocks "github.com/ipfs/go-block-format"
 	"github.com/ipfs/go-cid"
 	format "github.com/ipfs/go-ipld-format"
@@ -23,6 +24,10 @@ var ErrAlreadyRegisterd = errors.New("already registered")
 // ErrAlreadyRegistered means there is nothing registered for a retrieval id
 var ErrNotRegistered = errors.New("not registered")
 
+type contextKey string
+
+const peerIdContextKey = contextKey("traceableBlock.peerId")
+
 // MultiBlockstore creates a blockstore based on one or more linkystems, extracting the target linksystem for each request
 // from the retrieval id context key
 type MultiBlockstore struct {
@@ -123,7 +128,13 @@ func (mbs *MultiBlockstore) PutMany(ctx context.Context, blks []blocks.Block) er
 		return ErrNotRegistered
 	}
 	for _, blk := range blks {
-		w, commit, err := lsys.StorageWriteOpener(linking.LinkContext{Ctx: ctx})
+		lctx := ctx
+		if traceableBlock, ok := blk.(traceability.Block); ok {
+			lctx = context.WithValue(lctx, peerIdContextKey, traceableBlock.From)
+		} else {
+			logger.Warn("Got untraceable block from bitswap")
+		}
+		w, commit, err := lsys.StorageWriteOpener(linking.LinkContext{Ctx: lctx})
 		if err != nil {
 			return err
 		}

pkg/retriever/bitswaphelpers/preloadcachingstorage.go

@@ -362,18 +362,25 @@ func (cs *PreloadCachingStorage) preloadLink(pl *preloadingLink, linkCtx linking
 			}
 			pl.err = err
 		} else {
-			w, c, err := cs.cacheLinkSystem.StorageWriteOpener(linkCtx)
-			if err != nil {
-				pl.err = err
-				return
-			}
-			if _, err := io.Copy(w, reader); err != nil {
-				pl.err = err
-				return
-			}
-			if err := c(link); err != nil {
+			// the user of PreloadCachingStorage may have already wired up the
+			// cacheLinkSystem to receive the blocks from fetcher()
+			if has, err := linkSystemHas(cs.cacheLinkSystem, linkCtx, link); err != nil {
 				pl.err = err
 				return
+			} else if !has {
+				w, c, err := cs.cacheLinkSystem.StorageWriteOpener(linkCtx)
+				if err != nil {
+					pl.err = err
+					return
+				}
+				if _, err := io.Copy(w, reader); err != nil {
+					pl.err = err
+					return
+				}
+				if err := c(link); err != nil {
+					pl.err = err
+					return
+				}
 			}
 		}
 	})

pkg/retriever/bitswapretriever.go

@@ -16,7 +16,6 @@ import (
 	"github.com/filecoin-project/lassie/pkg/retriever/bitswaphelpers/groupworkpool"
 	"github.com/filecoin-project/lassie/pkg/types"
 	"github.com/ipfs/boxo/bitswap/client"
-	"github.com/ipfs/boxo/bitswap/client/traceability"
 	"github.com/ipfs/boxo/bitswap/network"
 	"github.com/ipfs/boxo/blockservice"
 	"github.com/ipfs/go-cid"
@@ -184,13 +183,22 @@ func (br *bitswapRetrieval) runRetrieval(ctx context.Context, ayncCandidates typ
 
 	totalWritten := atomic.Uint64{}
 	blockCount := atomic.Uint64{}
-	bytesWrittenCb := func(bytesWritten uint64) {
+	blockWrittenCb := func(from *peer.ID, bytesWritten uint64) {
 		// record first byte received
 		if totalWritten.Load() == 0 {
 			shared.sendEvent(ctx, events.FirstByte(br.clock.Now(), br.request.RetrievalID, bitswapCandidate, br.clock.Since(startTime), multicodec.TransportBitswap))
 		}
 		totalWritten.Add(bytesWritten)
 		blockCount.Add(1)
+		if from != nil {
+			shared.sendEvent(ctx, events.BlockReceived(
+				br.clock.Now(),
+				br.request.RetrievalID,
+				types.RetrievalCandidate{RootCid: br.request.Root, MinerPeer: peer.AddrInfo{ID: *from}},
+				multicodec.TransportBitswap,
+				bytesWritten,
+			))
+		}
 		// reset the timer
 		if bytesWritten > 0 && lastBytesReceivedTimer != nil {
 			lastBytesReceivedTimer.Reset(br.cfg.BlockTimeout)
@@ -253,12 +261,12 @@ func (br *bitswapRetrieval) runRetrieval(ctx context.Context, ayncCandidates typ
 
 		br.bstore.AddLinkSystem(
 			br.request.RetrievalID,
-			bitswaphelpers.NewByteCountingLinkSystem(storage.BitswapLinkSystem, bytesWrittenCb),
+			bitswaphelpers.NewByteCountingLinkSystem(storage.BitswapLinkSystem, blockWrittenCb),
 		)
 	} else {
 		br.bstore.AddLinkSystem(
 			br.request.RetrievalID,
-			bitswaphelpers.NewByteCountingLinkSystem(&br.request.LinkSystem, bytesWrittenCb),
+			bitswaphelpers.NewByteCountingLinkSystem(&br.request.LinkSystem, blockWrittenCb),
 		)
 		traversalLinkSys.StorageReadOpener = loader
 	}
@@ -347,17 +355,6 @@ func (br *bitswapRetrieval) loader(ctx context.Context, shared *retrievalShared)
 			return nil, err
 		}
 		logger.Debugw("Got block from bitswap", "retrievalID", br.request.RetrievalID, "root", br.request.Root, "block", cidLink.Cid, "size", len(blk.RawData()))
-		if traceableBlock, ok := blk.(traceability.Block); ok {
-			shared.sendEvent(ctx, events.BlockReceived(
-				br.clock.Now(),
-				br.request.RetrievalID,
-				types.RetrievalCandidate{RootCid: br.request.Root, MinerPeer: peer.AddrInfo{ID: traceableBlock.From}},
-				multicodec.TransportBitswap,
-				uint64(len(blk.RawData()))),
-			)
-		} else {
-			logger.Warn("Got untraceable block from bitswap")
-		}
 		return bytes.NewReader(blk.RawData()), nil
 	}
 }