rename p2p protocol to /fil/chain/xchg/0.0.1 (backwards-compatible); rename more.

chain/exchange/client.go

@@ -334,15 +334,13 @@ func (c *client) sendRequestToPeer(ctx context.Context, peer peer.ID, req *Reque
 	}()
 	// -- TRACE --
 
-	supported, err := c.host.Peerstore().SupportsProtocols(peer, BlockSyncProtocolID)
+	supported, err := c.host.Peerstore().SupportsProtocols(peer, BlockSyncProtocolID, ChainExchangeProtocolID)
 	if err != nil {
 		return nil, xerrors.Errorf("failed to get protocols for peer: %w", err)
 	}
-	if len(supported) == 0 || supported[0] != BlockSyncProtocolID {
-		return nil, xerrors.Errorf("peer %s does not support protocol %s",
-			peer, BlockSyncProtocolID)
-		// FIXME: `ProtoBook` should support a *single* protocol check that returns
-		//  a bool instead of a list.
+	if len(supported) == 0 || (supported[0] != BlockSyncProtocolID && supported[0] != ChainExchangeProtocolID) {
+		return nil, xerrors.Errorf("peer %s does not support protocols %s",
+			peer, []string{BlockSyncProtocolID, ChainExchangeProtocolID})
 	}
 
 	connectionStart := build.Clock.Now()
@@ -351,7 +349,7 @@ func (c *client) sendRequestToPeer(ctx context.Context, peer peer.ID, req *Reque
 	stream, err := c.host.NewStream(
 		network.WithNoDial(ctx, "should already have connection"),
 		peer,
-		BlockSyncProtocolID)
+		ChainExchangeProtocolID, BlockSyncProtocolID)
 	if err != nil {
 		c.RemovePeer(peer)
 		return nil, xerrors.Errorf("failed to open stream to peer: %w", err)
@@ -375,7 +373,7 @@ func (c *client) sendRequestToPeer(ctx context.Context, peer peer.ID, req *Reque
 		&res)
 	if err != nil {
 		c.peerTracker.logFailure(peer, build.Clock.Since(connectionStart))
-		return nil, xerrors.Errorf("failed to read blocksync response: %w", err)
+		return nil, xerrors.Errorf("failed to read chainxchg response: %w", err)
 	}
 
 	// FIXME: Move all this together at the top using a defer as done elsewhere.

chain/exchange/protocol.go

@@ -13,9 +13,17 @@ import (
 	"github.com/filecoin-project/lotus/chain/types"
 )
 
-var log = logging.Logger("blocksync")
+var log = logging.Logger("chainxchg")
 
-const BlockSyncProtocolID = "/fil/sync/blk/0.0.1"
+const (
+	// BlockSyncProtocolID is the protocol ID of the former blocksync protocol.
+	// Deprecated.
+	BlockSyncProtocolID = "/fil/sync/blk/0.0.1"
+
+	// ChainExchangeProtocolID is the protocol ID of the chain exchange
+	// protocol.
+	ChainExchangeProtocolID = "/fil/chain/xchg/0.0.1"
+)
 
 // FIXME: Bumped from original 800 to this to accommodate `syncFork()`
 //  use of `GetBlocks()`. It seems the expectation of that API is to
@@ -119,7 +127,7 @@ func (res *Response) statusToError() error {
 	case NotFound:
 		return xerrors.Errorf("not found")
 	case GoAway:
-		return xerrors.Errorf("not handling 'go away' blocksync responses yet")
+		return xerrors.Errorf("not handling 'go away' chainxchg responses yet")
 	case InternalError:
 		return xerrors.Errorf("block sync peer errored: %s", res.ErrorMessage)
 	case BadRequest:

chain/exchange/server.go

@@ -36,7 +36,7 @@ func NewServer(cs *store.ChainStore) Server {
 
 // HandleStream implements Server.HandleStream. Refer to the godocs there.
 func (s *server) HandleStream(stream inet.Stream) {
-	ctx, span := trace.StartSpan(context.Background(), "blocksync.HandleStream")
+	ctx, span := trace.StartSpan(context.Background(), "chainxchg.HandleStream")
 	defer span.End()
 
 	defer stream.Close() //nolint:errcheck
@@ -82,7 +82,7 @@ func (s *server) processRequest(ctx context.Context, req *Request) (*Response, e
 // `Response` indicating why we can't process it. We do not return any
 // internal errors here, we just signal protocol ones.
 func validateRequest(ctx context.Context, req *Request) (*validatedRequest, *Response) {
-	_, span := trace.StartSpan(ctx, "blocksync.ValidateRequest")
+	_, span := trace.StartSpan(ctx, "chainxchg.ValidateRequest")
 	defer span.End()
 
 	validReq := validatedRequest{}
@@ -129,7 +129,7 @@ func validateRequest(ctx context.Context, req *Request) (*validatedRequest, *Res
 }
 
 func (s *server) serviceRequest(ctx context.Context, req *validatedRequest) (*Response, error) {
-	_, span := trace.StartSpan(ctx, "blocksync.ServiceRequest")
+	_, span := trace.StartSpan(ctx, "chainxchg.ServiceRequest")
 	defer span.End()
 
 	chain, err := collectChainSegment(s.cs, req)

chain/sync.go

@@ -87,7 +87,7 @@ var LocalIncoming = "incoming"
 // The Syncer does not run workers itself. It's mainly concerned with
 // ensuring a consistent state of chain consensus. The reactive and network-
 // interfacing processes are part of other components, such as the SyncManager
-// (which owns the sync scheduler and sync workers), client, the HELLO
+// (which owns the sync scheduler and sync workers), ChainExchange, the HELLO
 // protocol, and the gossipsub block propagation layer.
 //
 // {hint/concept} The fork-choice rule as it currently stands is: "pick the

cli/log.go

@@ -49,7 +49,7 @@ var logSetLevel = &cli.Command{
 
    The system flag can be specified multiple times.
 
-   eg) log set-level --system chain --system blocksync debug
+   eg) log set-level --system chain --system chainxchg debug
 
    Available Levels:
    debug

gen/main.go

@@ -63,7 +63,7 @@ func main() {
 		os.Exit(1)
 	}
 
-	err = gen.WriteTupleEncodersToFile("./chain/blocksync/cbor_gen.go", "blocksync",
+	err = gen.WriteTupleEncodersToFile("./chain/exchange/cbor_gen.go", "exchange",
 		exchange.Request{},
 		exchange.Response{},
 		exchange.CompactedMessages{},

node/builder.go

@@ -103,7 +103,7 @@ const (
 	SetGenesisKey
 
 	RunHelloKey
-	RunBlockSyncKey
+	RunChainExchangeKey
 	RunChainGraphsync
 	RunPeerMgrKey
 
@@ -259,7 +259,7 @@ func Online() Option {
 			Override(new(*dtypes.MpoolLocker), new(dtypes.MpoolLocker)),
 
 			Override(RunHelloKey, modules.RunHello),
-			Override(RunBlockSyncKey, modules.RunBlockSync),
+			Override(RunChainExchangeKey, modules.RunChainExchange),
 			Override(RunPeerMgrKey, modules.RunPeerMgr),
 			Override(HandleIncomingBlocksKey, modules.HandleIncomingBlocks),
 

node/modules/services.go

@@ -69,8 +69,9 @@ func RunPeerMgr(mctx helpers.MetricsCtx, lc fx.Lifecycle, pmgr *peermgr.PeerMgr)
 	go pmgr.Run(helpers.LifecycleCtx(mctx, lc))
 }
 
-func RunBlockSync(h host.Host, svc exchange.Server) {
-	h.SetStreamHandler(exchange.BlockSyncProtocolID, svc.HandleStream)
+func RunChainExchange(h host.Host, svc exchange.Server) {
+	h.SetStreamHandler(exchange.BlockSyncProtocolID, svc.HandleStream)     // old
+	h.SetStreamHandler(exchange.ChainExchangeProtocolID, svc.HandleStream) // new
 }
 
 func HandleIncomingBlocks(mctx helpers.MetricsCtx, lc fx.Lifecycle, ps *pubsub.PubSub, s *chain.Syncer, bserv dtypes.ChainBlockService, chain *store.ChainStore, stmgr *stmgr.StateManager, h host.Host, nn dtypes.NetworkName) {