feat: accomodate BTC-timestamping (#40)

This PR closes #4.

The [change](babylonlabs-io/babylon#23) in
Babylon removed voting power from a finality provider if it has no
timestamped pub rand for a certain height. Therefore, from the finality
provider side, as long as it has voting power, the existence of a
timestamped pub rand is ensured. No need to do an extra query to check
it. This PR accommodates this change

clientcontroller/babylon.go

@@ -493,6 +493,15 @@ func (bc *BabylonController) QueryBtcLightClientTip() (*btclctypes.BTCHeaderInfo
 	return res.Header, nil
 }
 
+func (bc *BabylonController) QueryCurrentEpoch() (uint64, error) {
+	res, err := bc.bbnClient.QueryClient.CurrentEpoch()
+	if err != nil {
+		return 0, fmt.Errorf("failed to query BTC tip: %v", err)
+	}
+
+	return res.CurrentEpoch, nil
+}
+
 func (bc *BabylonController) QueryVotesAtHeight(height uint64) ([]bbntypes.BIP340PubKey, error) {
 	res, err := bc.bbnClient.QueryClient.VotesAtHeight(height)
 	if err != nil {
@@ -589,3 +598,21 @@ func (bc *BabylonController) SubmitCovenantSigs(
 
 	return &types.TxResponse{TxHash: res.TxHash, Events: res.Events}, nil
 }
+
+func (bc *BabylonController) GetBBNClient() *bbnclient.Client {
+	return bc.bbnClient
+}
+
+func (bc *BabylonController) InsertSpvProofs(submitter string, proofs []*btcctypes.BTCSpvProof) (*provider.RelayerTxResponse, error) {
+	msg := &btcctypes.MsgInsertBTCSpvProof{
+		Submitter: submitter,
+		Proofs:    proofs,
+	}
+
+	res, err := bc.reliablySendMsg(msg, emptyErrs, emptyErrs)
+	if err != nil {
+		return nil, err
+	}
+
+	return res, nil
+}

clientcontroller/interface.go

@@ -10,6 +10,7 @@ import (
 	"go.uber.org/zap"
 
 	finalitytypes "github.com/babylonlabs-io/babylon/x/finality/types"
+
 	fpcfg "github.com/babylonlabs-io/finality-provider/finality-provider/config"
 	"github.com/babylonlabs-io/finality-provider/types"
 )

finality-provider/config/config.go

@@ -25,9 +25,9 @@ const (
 	defaultFinalityProviderKeyName = "finality-provider"
 	DefaultRPCPort                 = 12581
 	defaultConfigFileName          = "fpd.conf"
-	defaultNumPubRand              = 100
-	defaultNumPubRandMax           = 200
-	defaultMinRandHeightGap        = 20
+	defaultNumPubRand              = 70000 // support running of 1 week with block production time as 10s
+	defaultNumPubRandMax           = 100000
+	defaultMinRandHeightGap        = 35000
 	defaultStatusUpdateInterval    = 20 * time.Second
 	defaultRandomInterval          = 30 * time.Second
 	defaultSubmitRetryInterval     = 1 * time.Second

finality-provider/service/fastsync.go

@@ -62,14 +62,6 @@ func (fp *FinalityProviderInstance) FastSync(startHeight, endHeight uint64) (*Fa
 				fp.metrics.IncrementFpTotalBlocksWithoutVotingPower(fp.GetBtcPkHex())
 				continue
 			}
-			// check whether the randomness has been committed
-			hasRand, err := fp.hasRandomness(b)
-			if err != nil {
-				return nil, err
-			}
-			if !hasRand {
-				break
-			}
 			// all good, add the block for catching up
 			catchUpBlocks = append(catchUpBlocks, b)
 		}

finality-provider/service/fastsync_test.go

@@ -88,10 +88,17 @@ func FuzzFastSync_NoRandomness(f *testing.F) {
 		_, err := fpIns.CommitPubRand(randomStartingHeight)
 		require.NoError(t, err)
 
-		mockClientController.EXPECT().QueryFinalityProviderVotingPower(fpIns.GetBtcPk(), gomock.Any()).
-			Return(uint64(1), nil).AnyTimes()
 		// the last height with pub rand is a random value inside [finalizedHeight+1, currentHeight]
 		lastHeightWithPubRand := uint64(rand.Intn(int(currentHeight)-int(finalizedHeight))) + finalizedHeight + 1
+		for i := randomStartingHeight; i <= currentHeight; i++ {
+			if i <= lastHeightWithPubRand {
+				mockClientController.EXPECT().QueryFinalityProviderVotingPower(fpIns.GetBtcPk(), i).
+					Return(uint64(1), nil).AnyTimes()
+			} else {
+				mockClientController.EXPECT().QueryFinalityProviderVotingPower(fpIns.GetBtcPk(), i).
+					Return(uint64(0), nil).AnyTimes()
+			}
+		}
 		lastCommittedPubRandMap := make(map[uint64]*ftypes.PubRandCommitResponse)
 		lastCommittedPubRandMap[lastHeightWithPubRand-10] = &ftypes.PubRandCommitResponse{
 			NumPubRand: 10 + 1,