hashsync: implement multi-peer split-sync

Author: ivan4th

hashsync/interface.go

@@ -3,11 +3,32 @@ package hashsync
 import (
 	"context"
 
+	"github.com/spacemeshos/go-spacemesh/common/types"
 	"github.com/spacemeshos/go-spacemesh/p2p"
 	"github.com/spacemeshos/go-spacemesh/p2p/server"
 )
 
+//go:generate mockgen -typed -package=hashsync -destination=./mocks_test.go -source=./interface.go
+
 type requester interface {
 	Run(context.Context) error
 	StreamRequest(context.Context, p2p.Peer, []byte, server.StreamRequestCallback, ...string) error
 }
+
+type peerSet interface {
+	addPeer(p p2p.Peer)
+	removePeer(p p2p.Peer)
+	numPeers() int
+	listPeers() []p2p.Peer
+	havePeer(p p2p.Peer) bool
+}
+
+type syncBase interface {
+	derive(p p2p.Peer) syncer
+	probe(ctx context.Context, p p2p.Peer) (int, error)
+}
+
+type syncer interface {
+	peer() p2p.Peer
+	sync(ctx context.Context, x, y *types.Hash32) error
+}