address code review

chain/chain.go

@@ -236,6 +236,10 @@ func NewChainStore(bs bstore.Blockstore, ds dstore.Batching) *ChainStore {
 
 func (cs *ChainStore) Load() error {
 	head, err := cs.ds.Get(chainHeadKey)
+	if err == dstore.ErrNotFound {
+		log.Warn("no previous chain state found")
+		return nil
+	}
 	if err != nil {
 		return errors.Wrap(err, "failed to load chain state from datastore")
 	}
@@ -353,9 +357,8 @@ func (cs *ChainStore) maybeTakeHeavierTipSet(ts *TipSet) error {
 		cs.heaviest = ts
 
 		if err := cs.writeHead(ts); err != nil {
-			// TODO: should this error? we've already accepted it as our best
-			// head and told everyone...
-			return err
+			log.Errorf("failed to write chain head: %s", err)
+			return nil
 		}
 	}
 	return nil

node/builder.go

@@ -128,6 +128,10 @@ func defaults() []Option {
 	return []Option{
 		Override(new(helpers.MetricsCtx), context.Background),
 		Override(new(record.Validator), modules.RecordValidator),
+
+		// Filecoin modules
+
+		Override(new(*chain.ChainStore), modules.ChainStore),
 	}
 }
 

node/modules/core.go

@@ -8,6 +8,7 @@ import (
 	"path/filepath"
 
 	"github.com/gbrlsnchs/jwt/v3"
+
 	"github.com/ipfs/go-bitswap"
 	"github.com/ipfs/go-bitswap/network"
 	"github.com/ipfs/go-blockservice"
@@ -163,3 +164,15 @@ func ClientDAG(lc fx.Lifecycle, fstore *filestore.Filestore) ipld.DAGService {
 
 	return dag
 }
+
+func ChainStore(lc fx.Lifecycle, bs blockstore.Blockstore, ds datastore.Batching) *chain.ChainStore {
+	chain := chain.NewChainStore(bs, ds)
+
+	lc.Append(fx.Hook{
+		OnStart: func(ctx context.Context) error {
+			return chain.Load()
+		},
+	})
+
+	return chain
+}