103 lines
2.2 KiB
Go
103 lines
2.2 KiB
Go
package hello
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import (
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"context"
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"fmt"
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"github.com/ipfs/go-cid"
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cbor "github.com/ipfs/go-ipld-cbor"
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logging "github.com/ipfs/go-log"
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"github.com/libp2p/go-libp2p-core/host"
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inet "github.com/libp2p/go-libp2p-core/network"
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"github.com/libp2p/go-libp2p-core/peer"
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"github.com/filecoin-project/go-lotus/chain"
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"github.com/filecoin-project/go-lotus/lib/cborrpc"
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)
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const ProtocolID = "/fil/hello/1.0.0"
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var log = logging.Logger("hello")
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func init() {
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cbor.RegisterCborType(Message{})
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}
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type Message struct {
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HeaviestTipSet []cid.Cid
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HeaviestTipSetWeight uint64
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GenesisHash cid.Cid
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}
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type Service struct {
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newStream chain.NewStreamFunc
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cs *chain.ChainStore
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syncer *chain.Syncer
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}
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func NewHelloService(h host.Host, cs *chain.ChainStore, syncer *chain.Syncer) *Service {
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return &Service{
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newStream: h.NewStream,
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cs: cs,
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syncer: syncer,
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}
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}
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func (hs *Service) HandleStream(s inet.Stream) {
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defer s.Close()
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var hmsg Message
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if err := cborrpc.ReadCborRPC(s, &hmsg); err != nil {
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log.Infow("failed to read hello message", "error", err)
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return
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}
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log.Debugw("genesis from hello",
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"tipset", hmsg.HeaviestTipSet,
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"peer", s.Conn().RemotePeer(),
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"hash", hmsg.GenesisHash)
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if hmsg.GenesisHash != hs.syncer.Genesis.Cids()[0] {
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log.Error("other peer has different genesis!")
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s.Conn().Close()
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return
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}
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ts, err := hs.syncer.FetchTipSet(context.Background(), s.Conn().RemotePeer(), hmsg.HeaviestTipSet)
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if err != nil {
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log.Errorf("failed to fetch tipset from peer during hello: %s", err)
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return
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}
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hs.syncer.InformNewHead(s.Conn().RemotePeer(), ts)
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}
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func (hs *Service) SayHello(ctx context.Context, pid peer.ID) error {
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s, err := hs.newStream(ctx, pid, ProtocolID)
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if err != nil {
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return err
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}
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hts := hs.cs.GetHeaviestTipSet()
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weight := hs.cs.Weight(hts)
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gen, err := hs.cs.GetGenesis()
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if err != nil {
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return err
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}
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hmsg := &Message{
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HeaviestTipSet: hts.Cids(),
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HeaviestTipSetWeight: weight,
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GenesisHash: gen.Cid(),
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}
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fmt.Println("SENDING HELLO MESSAGE: ", hts.Cids())
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fmt.Println("hello message genesis: ", gen.Cid())
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if err := cborrpc.WriteCborRPC(s, hmsg); err != nil {
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return err
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}
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return nil
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}
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