NV18: Filecoin EVM runtime + Actor Events + EthAccount + EAM + f4 addressing (#9998)

Co-authored-by: Steven Allen <steven@stebalien.com>
Co-authored-by: Raul Kripalani <raulk@users.noreply.github.com>
Co-authored-by: Kevin Li <ychiaoli18@users.noreply.github.com>
Co-authored-by: vyzo <vyzo@hackzen.org>
Co-authored-by: Ian Davis <nospam@iandavis.com>
Co-authored-by: Aayush Rajasekaran <arajasek94@gmail.com>
Co-authored-by: Jiaying Wang <42981373+jennijuju@users.noreply.github.com>
Co-authored-by: Jennifer Wang <jiayingw703@gmail.com>
Co-authored-by: Geoff Stuart <geoff.vball@gmail.com>
Co-authored-by: Shrenuj Bansal <shrenuj.bansal@protocol.ai>
Co-authored-by: Shrenuj Bansal <108157875+shrenujbansal@users.noreply.github.com>
Co-authored-by: Geoff Stuart <geoffrey.stuart@protocol.ai>
Co-authored-by: Aayush Rajasekaran <aayushrajasekaran@Aayushs-MacBook-Pro.local>
Co-authored-by: ZenGround0 <5515260+ZenGround0@users.noreply.github.com>
Co-authored-by: zenground0 <ZenGround0@users.noreply.github.com>

node/impl/full/chain.go

@@ -6,6 +6,7 @@ import (
 	"context"
 	"encoding/json"
 	"io"
+	"math"
 	"strconv"
 	"strings"
 	"sync"
@@ -24,6 +25,7 @@ import (
 	"golang.org/x/xerrors"
 
 	"github.com/filecoin-project/go-address"
+	amt4 "github.com/filecoin-project/go-amt-ipld/v4"
 	"github.com/filecoin-project/go-state-types/abi"
 	"github.com/filecoin-project/specs-actors/actors/util/adt"
 
@@ -654,6 +656,33 @@ func (a *ChainAPI) ChainBlockstoreInfo(ctx context.Context) (map[string]interfac
 	return info.Info(), nil
 }
 
+// ChainGetEvents returns the events under an event AMT root CID.
+//
+// TODO (raulk) make copies of this logic elsewhere use this (e.g. itests, CLI, events filter).
+func (a *ChainAPI) ChainGetEvents(ctx context.Context, root cid.Cid) ([]types.Event, error) {
+	store := cbor.NewCborStore(a.ExposedBlockstore)
+	evtArr, err := amt4.LoadAMT(ctx, store, root, amt4.UseTreeBitWidth(types.EventAMTBitwidth))
+	if err != nil {
+		return nil, xerrors.Errorf("load events amt: %w", err)
+	}
+
+	ret := make([]types.Event, 0, evtArr.Len())
+	var evt types.Event
+	err = evtArr.ForEach(ctx, func(u uint64, deferred *cbg.Deferred) error {
+		if u > math.MaxInt {
+			return xerrors.Errorf("too many events")
+		}
+		if err := evt.UnmarshalCBOR(bytes.NewReader(deferred.Raw)); err != nil {
+			return err
+		}
+
+		ret = append(ret, evt)
+		return nil
+	})
+
+	return ret, err
+}
+
 func (a *ChainAPI) ChainPrune(ctx context.Context, opts api.PruneOpts) error {
 	pruner, ok := a.BaseBlockstore.(interface {
 		PruneChain(opts api.PruneOpts) error