core: apply megacheck vet tool (unused, gosimple, staticcheck)

consensus/byzantine_test.go

@@ -77,6 +77,7 @@ func TestByzantine(t *testing.T) {
 
 		var conRI p2p.Reactor
 		conRI = conR
+
 		if i == 0 {
 			conRI = NewByzantineReactor(conR)
 		}

consensus/common_test.go

@@ -222,17 +222,6 @@ func subscribeToVoter(cs *ConsensusState, addr []byte) chan interface{} {
 	return voteCh
 }
 
-func readVotes(ch chan interface{}, reads int) chan struct{} {
-	wg := make(chan struct{})
-	go func() {
-		for i := 0; i < reads; i++ {
-			<-ch // read the precommit event
-		}
-		close(wg)
-	}()
-	return wg
-}
-
 //-------------------------------------------------------------------------------
 // consensus states
 
@@ -274,16 +263,6 @@ func loadPrivValidator(config *cfg.Config) *types.PrivValidator {
 	return privValidator
 }
 
-func fixedConsensusState() *ConsensusState {
-	stateDB := dbm.NewMemDB()
-	state := sm.MakeGenesisStateFromFile(stateDB, config.GenesisFile())
-	state.SetLogger(log.TestingLogger().With("module", "state"))
-	privValidator := loadPrivValidator(config)
-	cs := newConsensusState(state, privValidator, counter.NewCounterApplication(true))
-	cs.SetLogger(log.TestingLogger())
-	return cs
-}
-
 func fixedConsensusStateDummy() *ConsensusState {
 	stateDB := dbm.NewMemDB()
 	state := sm.MakeGenesisStateFromFile(stateDB, config.GenesisFile())

consensus/height_vote_set_test.go

@@ -30,6 +30,9 @@ func TestPeerCatchupRounds(t *testing.T) {
 
 	vote1001_0 := makeVoteHR(t, 1, 1001, privVals, 0)
 	added, err = hvs.AddVote(vote1001_0, "peer1")
+	if err != nil {
+		t.Error("AddVote error", err)
+	}
 	if added {
 		t.Error("Expected to *not* add vote from peer, too many catchup rounds.")
 	}

consensus/reactor.go

@@ -351,7 +351,7 @@ func makeRoundStepMessages(rs *RoundState) (nrsMsg *NewRoundStepMessage, csMsg *
 		Height: rs.Height,
 		Round:  rs.Round,
 		Step:   rs.Step,
-		SecondsSinceStartTime: int(time.Now().Sub(rs.StartTime).Seconds()),
+		SecondsSinceStartTime: int(time.Since(rs.StartTime).Seconds()),
 		LastCommitRound:       rs.LastCommit.Round(),
 	}
 	if rs.Step == RoundStepCommit {

consensus/replay.go

@@ -104,6 +104,9 @@ func (cs *ConsensusState) catchupReplay(csHeight int) error {
 	// NOTE: This is just a sanity check. As far as we know things work fine without it,
 	// and Handshake could reuse ConsensusState if it weren't for this check (since we can crash after writing ENDHEIGHT).
 	gr, found, err := cs.wal.group.Search("#ENDHEIGHT: ", makeHeightSearchFunc(csHeight))
+	if err != nil {
+		return err
+	}
 	if gr != nil {
 		gr.Close()
 	}
@@ -132,7 +135,7 @@ func (cs *ConsensusState) catchupReplay(csHeight int) error {
 	if !found {
 		// if we upgraded from 0.9 to 0.9.1, we may have #HEIGHT instead
 		// TODO (0.10.0): remove this
-		gr, found, err = cs.wal.group.Search("#HEIGHT: ", makeHeightSearchFunc(csHeight))
+		gr, _, err = cs.wal.group.Search("#HEIGHT: ", makeHeightSearchFunc(csHeight))
 		if err == io.EOF {
 			cs.Logger.Error("Replay: wal.group.Search returned EOF", "#HEIGHT", csHeight)
 			return nil

consensus/replay_test.go

@@ -557,67 +557,6 @@ func readPieceFromWAL(msgBytes []byte) (interface{}, error) {
 	return nil, nil
 }
 
-// make some bogus txs
-func txsFunc(blockNum int) (txs []types.Tx) {
-	for i := 0; i < 10; i++ {
-		txs = append(txs, types.Tx([]byte{byte(blockNum), byte(i)}))
-	}
-	return txs
-}
-
-// sign a commit vote
-func signCommit(chainID string, privVal *types.PrivValidator, height, round int, hash []byte, header types.PartSetHeader) *types.Vote {
-	vote := &types.Vote{
-		ValidatorIndex:   0,
-		ValidatorAddress: privVal.Address,
-		Height:           height,
-		Round:            round,
-		Type:             types.VoteTypePrecommit,
-		BlockID:          types.BlockID{hash, header},
-	}
-
-	sig := privVal.Sign(types.SignBytes(chainID, vote))
-	vote.Signature = sig
-	return vote
-}
-
-// make a blockchain with one validator
-func makeBlockchain(t *testing.T, chainID string, nBlocks int, privVal *types.PrivValidator, proxyApp proxy.AppConns, state *sm.State) (blockchain []*types.Block, commits []*types.Commit) {
-
-	prevHash := state.LastBlockID.Hash
-	lastCommit := new(types.Commit)
-	prevParts := types.PartSetHeader{}
-	valHash := state.Validators.Hash()
-	prevBlockID := types.BlockID{prevHash, prevParts}
-
-	for i := 1; i < nBlocks+1; i++ {
-		block, parts := types.MakeBlock(i, chainID, txsFunc(i), lastCommit,
-			prevBlockID, valHash, state.AppHash, testPartSize)
-		fmt.Println(i)
-		fmt.Println(block.LastBlockID)
-		err := state.ApplyBlock(nil, proxyApp.Consensus(), block, block.MakePartSet(testPartSize).Header(), mempool)
-		if err != nil {
-			t.Fatal(i, err)
-		}
-
-		voteSet := types.NewVoteSet(chainID, i, 0, types.VoteTypePrecommit, state.Validators)
-		vote := signCommit(chainID, privVal, i, 0, block.Hash(), parts.Header())
-		_, err = voteSet.AddVote(vote)
-		if err != nil {
-			t.Fatal(err)
-		}
-
-		prevHash = block.Hash()
-		prevParts = parts.Header()
-		lastCommit = voteSet.MakeCommit()
-		prevBlockID = types.BlockID{prevHash, prevParts}
-
-		blockchain = append(blockchain, block)
-		commits = append(commits, lastCommit)
-	}
-	return blockchain, commits
-}
-
 // fresh state and mock store
 func stateAndStore(config *cfg.Config, pubKey crypto.PubKey) (*sm.State, *mockBlockStore) {
 	stateDB := dbm.NewMemDB()

consensus/state.go

@@ -648,10 +648,10 @@ func (cs *ConsensusState) handleMsg(mi msgInfo, rs RoundState) {
 	case *VoteMessage:
 		// attempt to add the vote and dupeout the validator if its a duplicate signature
 		// if the vote gives us a 2/3-any or 2/3-one, we transition
-		err := cs.tryAddVote(msg.Vote, peerKey)
-		if err == ErrAddingVote {
-			// TODO: punish peer
-		}
+		_ = cs.tryAddVote(msg.Vote, peerKey)
+		//if err == ErrAddingVote {
+		// TODO: punish peer
+		//}
 
 		// NOTE: the vote is broadcast to peers by the reactor listening
 		// for vote events
@@ -897,10 +897,10 @@ func (cs *ConsensusState) enterPrevote(height int, round int) {
 	// fire event for how we got here
 	if cs.isProposalComplete() {
 		types.FireEventCompleteProposal(cs.evsw, cs.RoundStateEvent())
-	} else {
-		// we received +2/3 prevotes for a future round
-		// TODO: catchup event?
-	}
+	} // else {
+	// we received +2/3 prevotes for a future round
+	// TODO: catchup event?
+	//}
 
 	cs.Logger.Info(cmn.Fmt("enterPrevote(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
 
@@ -939,7 +939,6 @@ func (cs *ConsensusState) defaultDoPrevote(height int, round int) {
 	// NOTE: the proposal signature is validated when it is received,
 	// and the proposal block parts are validated as they are received (against the merkle hash in the proposal)
 	cs.signAddVote(types.VoteTypePrevote, cs.ProposalBlock.Hash(), cs.ProposalBlockParts.Header())
-	return
 }
 
 // Enter: any +2/3 prevotes at next round.
@@ -1059,7 +1058,6 @@ func (cs *ConsensusState) enterPrecommit(height int, round int) {
 	}
 	types.FireEventUnlock(cs.evsw, cs.RoundStateEvent())
 	cs.signAddVote(types.VoteTypePrecommit, nil, types.PartSetHeader{})
-	return
 }
 
 // Enter: any +2/3 precommits for next round.
@@ -1124,9 +1122,9 @@ func (cs *ConsensusState) enterCommit(height int, commitRound int) {
 			// Set up ProposalBlockParts and keep waiting.
 			cs.ProposalBlock = nil
 			cs.ProposalBlockParts = types.NewPartSetFromHeader(blockID.PartsHeader)
-		} else {
-			// We just need to keep waiting.
-		}
+		} // else {
+		// We just need to keep waiting.
+		//}
 	}
 }
 
@@ -1250,7 +1248,6 @@ func (cs *ConsensusState) finalizeCommit(height int) {
 	// * cs.Height has been increment to height+1
 	// * cs.Step is now RoundStepNewHeight
 	// * cs.StartTime is set to when we will start round0.
-	return
 }
 
 //-----------------------------------------------------------------------------

consensus/state_test.go

@@ -523,7 +523,10 @@ func TestLockPOLRelock(t *testing.T) {
 	<-voteCh // prevote
 
 	signAddVotes(cs1, types.VoteTypePrevote, cs1.ProposalBlock.Hash(), cs1.ProposalBlockParts.Header(), vs2, vs3, vs4)
-	_, _, _ = <-voteCh, <-voteCh, <-voteCh // prevotes
+	// prevotes
+	<-voteCh
+	<-voteCh
+	<-voteCh
 
 	<-voteCh // our precommit
 	// the proposed block should now be locked and our precommit added
@@ -532,7 +535,10 @@ func TestLockPOLRelock(t *testing.T) {
 	// add precommits from the rest
 	signAddVotes(cs1, types.VoteTypePrecommit, nil, types.PartSetHeader{}, vs2, vs4)
 	signAddVotes(cs1, types.VoteTypePrecommit, cs1.ProposalBlock.Hash(), cs1.ProposalBlockParts.Header(), vs3)
-	_, _, _ = <-voteCh, <-voteCh, <-voteCh // precommits
+	// precommites
+	<-voteCh
+	<-voteCh
+	<-voteCh
 
 	// before we timeout to the new round set the new proposal
 	prop, propBlock := decideProposal(cs1, vs2, vs2.Height, vs2.Round+1)
@@ -570,7 +576,10 @@ func TestLockPOLRelock(t *testing.T) {
 
 	// now lets add prevotes from everyone else for the new block
 	signAddVotes(cs1, types.VoteTypePrevote, propBlockHash, propBlockParts.Header(), vs2, vs3, vs4)
-	_, _, _ = <-voteCh, <-voteCh, <-voteCh // prevotes
+	// prevotes
+	<-voteCh
+	<-voteCh
+	<-voteCh
 
 	// now either we go to PrevoteWait or Precommit
 	select {
@@ -585,7 +594,8 @@ func TestLockPOLRelock(t *testing.T) {
 	validatePrecommit(t, cs1, 1, 1, vss[0], propBlockHash, propBlockHash)
 
 	signAddVotes(cs1, types.VoteTypePrecommit, propBlockHash, propBlockParts.Header(), vs2, vs3)
-	_, _ = <-voteCh, <-voteCh
+	<-voteCh
+	<-voteCh
 
 	be := <-newBlockCh
 	b := be.(types.TMEventData).Unwrap().(types.EventDataNewBlockHeader)