Add hook and injection code for peer evaluation

eth/fetcher/block_fetcher.go

@@ -516,6 +516,8 @@ func (f *BlockFetcher) loop() {
 							case res := <-resCh:
 								res.Done <- nil
 								f.FilterHeaders(peer, *res.Res.(*eth.BlockHeadersRequest), time.Now(), announcedAt)
+								log.Error("peer", "this is the peer id", peer)
+								pluginPeerEval(peer, *res.Res.(*eth.BlockHeadersRequest))
 
 							case <-timeout.C:
 								// The peer didn't respond in time. The request

eth/fetcher/xplugeth_hooks.go

@@ -0,0 +1,13 @@
+package fetcher
+
+import (
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/openrelayxyz/xplugeth"
+	"github.com/openrelayxyz/xplugeth/hooks/blockchain"
+)
+
+func pluginPeerEval(id string, headers []*types.Header) {
+	for _, m := range xplugeth.GetModules[blockchain.PeerEvalPlugin]() {
+		m.PeerEval(id, headers)
+	}
+}