fix: impl api BeaconGetEntry (#4989)

Author: simlecode

app/submodule/chain/beacon.go

@@ -0,0 +1,27 @@
+package chain
+
+import (
+	"context"
+
+	"github.com/filecoin-project/go-state-types/abi"
+	v1api "github.com/filecoin-project/venus/venus-shared/api/chain/v1"
+	"github.com/filecoin-project/venus/venus-shared/types"
+)
+
+var _ v1api.IBeacon = &beaconAPI{}
+
+type beaconAPI struct {
+	chain *ChainSubmodule
+}
+
+//NewBeaconAPI create a new beacon api
+func NewBeaconAPI(chain *ChainSubmodule) v1api.IBeacon {
+	return &beaconAPI{chain: chain}
+}
+
+// BeaconGetEntry returns the beacon entry for the given filecoin epoch. If
+// the entry has not yet been produced, the call will block until the entry
+// becomes available
+func (beaconAPI *beaconAPI) BeaconGetEntry(ctx context.Context, epoch abi.ChainEpoch) (*types.BeaconEntry, error) {
+	return beaconAPI.chain.API().StateGetBeaconEntry(ctx, epoch)
+}

app/submodule/chain/chain_submodule.go

@@ -113,6 +113,7 @@ func (chain *ChainSubmodule) API() v1api.IChain {
 		IActor:      NewActorAPI(chain),
 		IChainInfo:  NewChainInfoAPI(chain),
 		IMinerState: NewMinerStateAPI(chain),
+		IBeacon:     NewBeaconAPI(chain),
 	}
 }