From 08a5950863edab34b2769813d05251d407a19a0a Mon Sep 17 00:00:00 2001
From: vyzo <vyzo@hackzen.org>
Date: Mon, 4 Apr 2022 14:14:27 +0300
Subject: [PATCH] actor manifests and metadata

---
 chain/actors/manifest.go | 72 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 chain/actors/manifest.go

diff --git a/chain/actors/manifest.go b/chain/actors/manifest.go
new file mode 100644
index 000000000..ac3733737
--- /dev/null
+++ b/chain/actors/manifest.go
@@ -0,0 +1,72 @@
+package actors
+
+import (
+	"context"
+
+	"golang.org/x/xerrors"
+
+	cid "github.com/ipfs/go-cid"
+	cbor "github.com/ipfs/go-ipld-cbor"
+
+	"github.com/filecoin-project/lotus/chain/actors/adt"
+	"github.com/filecoin-project/specs-actors/v8/actors/builtin/manifest"
+)
+
+var manifestCids map[Version]cid.Cid = map[Version]cid.Cid{
+	// TODO manifest CIDs for v8 and upwards
+}
+
+var manifests map[Version]*manifest.Manifest
+var actorMeta map[cid.Cid]actorEntry
+
+type actorEntry struct {
+	name    string
+	version Version
+}
+
+func LoadManifests(ctx context.Context, store cbor.IpldStore) error {
+	adtStore := adt.WrapStore(ctx, store)
+
+	manifests = make(map[Version]*manifest.Manifest)
+	actorMeta = make(map[cid.Cid]actorEntry)
+
+	for av, mfCid := range manifestCids {
+		mf := &manifest.Manifest{}
+		if err := adtStore.Get(ctx, mfCid, mf); err != nil {
+			return xerrors.Errorf("error reading manifest for network version %d (cid: %s): %w", av, mfCid, err)
+		}
+
+		if err := mf.Load(ctx, adtStore); err != nil {
+			return xerrors.Errorf("error loading manifest for network version %d: %w", av, err)
+		}
+
+		manifests[av] = mf
+
+		for _, name := range []string{"system", "init", "cron", "account", "storagepower", "storageminer", "storagemarket", "paymentchannel", "multisig", "reward", "verifiedregistry"} {
+			c, ok := mf.Get(name)
+			if ok {
+				actorMeta[c] = actorEntry{name: name, version: av}
+			}
+		}
+	}
+
+	return nil
+}
+
+func GetActorCodeID(av Version, name string) (cid.Cid, bool) {
+	mf, ok := manifests[av]
+	if ok {
+		return mf.Get(name)
+	}
+
+	return cid.Undef, false
+}
+
+func GetActorMetaByCode(c cid.Cid) (string, Version, bool) {
+	entry, ok := actorMeta[c]
+	if !ok {
+		return "", -1, false
+	}
+
+	return entry.name, entry.version, true
+}