Explicit Peering Agreement implementation

beacon-chain/p2p/pubsub.go

@@ -3,6 +3,7 @@ package p2p
 import (
 	"context"
 	"encoding/hex"
+	"fmt"
 	"strings"
 	"time"
 
@@ -130,7 +131,7 @@ func (s *Service) peerInspector(peerMap map[peer.ID]*pubsub.PeerScoreSnapshot) {
 	}
 }
 
-// Creates a list of pubsub options to configure out router with.
+// pubsubOptions creates a list of options to configure our router with.
 func (s *Service) pubsubOptions() []pubsub.Option {
 	psOpts := []pubsub.Option{
 		pubsub.WithMessageSignaturePolicy(pubsub.StrictNoSign),
@@ -147,9 +148,35 @@ func (s *Service) pubsubOptions() []pubsub.Option {
 		pubsub.WithGossipSubParams(pubsubGossipParam()),
 		pubsub.WithRawTracer(gossipTracer{host: s.host}),
 	}
+
+	if len(s.cfg.StaticPeers) > 0 {
+		directPeersAddrInfos, err := parsePeersEnr(s.cfg.StaticPeers)
+		if err != nil {
+			log.WithError(err).Error("Could not add direct peer option")
+			return psOpts
+		}
+		psOpts = append(psOpts, pubsub.WithDirectPeers(directPeersAddrInfos))
+	}
+
 	return psOpts
 }
 
+// parsePeersEnr takes a list of raw ENRs and converts them into a list of AddrInfos.
+func parsePeersEnr(peers []string) ([]peer.AddrInfo, error) {
+	addrs, err := PeersFromStringAddrs(peers)
+	if err != nil {
+		return nil, fmt.Errorf("Cannot convert peers raw ENRs into multiaddresses: %v", err)
+	}
+	if len(addrs) == 0 {
+		return nil, fmt.Errorf("Converting peers raw ENRs into multiaddresses resulted in an empty list")
+	}
+	directAddrInfos, err := peer.AddrInfosFromP2pAddrs(addrs...)
+	if err != nil {
+		return nil, fmt.Errorf("Cannot convert peers multiaddresses into AddrInfos: %v", err)
+	}
+	return directAddrInfos, nil
+}
+
 // creates a custom gossipsub parameter set.
 func pubsubGossipParam() pubsub.GossipSubParams {
 	gParams := pubsub.DefaultGossipSubParams()