Improve linter setup (#185)

* [linter] Remove unused exclusions

Linter `nosnakecase` was removed in 1e1138d0268a9896a1bd058e9b65b808eb20666e.

* [linter] Add tool for code clone detection

* [linter] Add `errorlint`

Find code that will cause problems with the error wrapping scheme
introduced in Go 1.13.

* [linter] Add `exhaustive`

Check exhaustiveness of enum switch statements.

* [linter] Add `forcetypeassert`

Finds type assertions which did forcely such as below:
```
func f() {
	var a interface{}
	_ = a.(int) // type assertion must be checked
}
```

* [linter] Add `gocritic`

Provides diagnostics that check for bugs, performance and style issues.

Signed-off-by: Julian Strobl <jmastr@mailbox.org>

.golangci.yaml

@@ -11,19 +11,24 @@ linters:
     - contextcheck
     - decorder
     - dogsled
+    - dupl
     - dupword
     - durationcheck
     - errcheck
     - errchkjson
     - errname
+    - errorlint
     - execinquery
+    - exhaustive
     - exportloopref
     - forbidigo
+    - forcetypeassert
     - ginkgolinter
     - gocheckcompilerdirectives
     - gochecksumtype
     - gocognit
     - goconst
+    - gocritic
     - gocyclo
     - gofmt
     - goheader
@@ -71,12 +76,12 @@ linters-settings:
     max-func-lines: 100
 issues:
   exclude-rules:
-    - path: codec\.go
+    - path: x/.*/types/message.*\.go
       linters:
-        - nosnakecase
-    - path: app\/simulation_test\.go
+        - dupl
+    - path: x/dao/client/cli/tx_reissue_rddl.*\.go
       linters:
-        - nosnakecase
-    - path: testutil\/rest\.go
+        - dupl
+    - path: testutil/nullify/nullify\.go
       linters:
-        - nosnakecase
+        - exhaustive

cmd/planetmint-god/cmd/root.go

@@ -112,7 +112,10 @@ func initRootCmd(
 	// Set config
 	initSDKConfig()
 
-	gentxModule := app.ModuleBasics[genutiltypes.ModuleName].(genutil.AppModuleBasic)
+	gentxModule, ok := app.ModuleBasics[genutiltypes.ModuleName].(genutil.AppModuleBasic)
+	if !ok {
+		panic("forced type assertion failed for gentxModule")
+	}
 	rootCmd.AddCommand(
 		genutilcli.InitCmd(app.ModuleBasics, app.DefaultNodeHome),
 		genutilcli.CollectGenTxsCmd(banktypes.GenesisBalancesIterator{}, app.DefaultNodeHome, gentxModule.GenTxValidator),

cmd/planetmint-god/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"os"
 
 	"github.com/cosmos/cosmos-sdk/server"
@@ -13,12 +14,10 @@ import (
 func main() {
 	rootCmd, _ := cmd.NewRootCmd()
 	if err := svrcmd.Execute(rootCmd, "", app.DefaultNodeHome); err != nil {
-		switch e := err.(type) {
-		case server.ErrorCode:
+		var e *server.ErrorCode
+		if errors.As(err, &e) {
 			os.Exit(e.Code)
-
-		default:
-			os.Exit(1)
 		}
+		os.Exit(1)
 	}
 }

testutil/network/network.go

@@ -40,7 +40,7 @@ func New(t *testing.T, configs ...Config) *Network {
 	}
 	validatorTmpDir := t.TempDir()
 
-	//set the proper root dir for the test environment so that the abci.go logic works
+	// set the proper root dir for the test environment so that the abci.go logic works
 	appConfig := config.GetConfig()
 	appConfig.SetRoot(validatorTmpDir + "/node0/simd")
 

util/issue_commands.go

@@ -25,7 +25,7 @@ func buildSignBroadcastTx(goCtx context.Context, sendingValidatorAddress string,
 
 func InitRDDLReissuanceProcess(goCtx context.Context, proposerAddress string, txUnsigned string, blockHeight int64) (err error) {
 	ctx := sdk.UnwrapSDKContext(goCtx)
-	//get_last_PoPBlockHeight() // TODO: to be read form the upcoming PoP-store
+	// get_last_PoPBlockHeight() // TODO: to be read form the upcoming PoP-store
 	logger := ctx.Logger()
 	sendingValidatorAddress := config.GetConfig().ValidatorAddress
 	logger.Debug("REISSUE: create Reissuance Proposal")

x/dao/keeper/distribution.go

@@ -65,10 +65,10 @@ func getLastPopBytes(height int64) []byte {
 	return big.NewInt(height + 1).Bytes()
 }
 
-func ComputeDistribution(lastReissuance int64, BlockHeight int64, amount uint64) (distribution types.DistributionOrder) {
+func ComputeDistribution(lastReissuance int64, blockHeight int64, amount uint64) (distribution types.DistributionOrder) {
 	conf := config.GetConfig()
 	distribution.FirstPop = lastReissuance
-	distribution.LastPop = BlockHeight
+	distribution.LastPop = blockHeight
 
 	distribution.DaoAddr = conf.DistributionAddrDAO
 	distribution.InvestorAddr = conf.DistributionAddrInv
@@ -105,11 +105,11 @@ func (k Keeper) GetDistributionForReissuedTokens(ctx sdk.Context, blockHeight in
 	reissuances := k.getReissuancesRange(ctx, lastPoP)
 	var overallAmount uint64
 	for index, obj := range reissuances {
-		if (index == 0 && lastPoP == 0 && obj.BlockHeight == 0) || //corner case (beginning of he chain)
+		if (index == 0 && lastPoP == 0 && obj.BlockHeight == 0) || // corner case (beginning of he chain)
 			(lastPoP < obj.BlockHeight && obj.BlockHeight <= blockHeight) {
 			amount, err := getUint64FromTxString(ctx, obj.Rawtx)
 			if err == nil {
-				overallAmount = overallAmount + amount
+				overallAmount += amount
 			}
 		} else {
 			ctx.Logger().Info("%u %u %u", lastPoP, obj.BlockHeight, blockHeight)

x/dao/keeper/msg_server_reissue_rddl_proposal.go

@@ -21,7 +21,7 @@ func (k msgServer) ReissueRDDLProposal(goCtx context.Context, msg *types.MsgReis
 		if err == nil {
 			// 3. notarize result by notarizing the liquid tx-id
 			_ = util.SendRDDLReissuanceResult(goCtx, msg.GetProposer(), txID, msg.GetBlockHeight())
-			//TODO verify and  resolve error
+			// TODO verify and  resolve error
 		} else {
 			logger.Error("REISSUE: Asset reissuance failure: " + err.Error())
 		}

x/dao/keeper/msg_server_report_pop_result.go

@@ -32,14 +32,14 @@ func (k msgServer) ReportPopResult(goCtx context.Context, msg *types.MsgReportPo
 
 // TODO: ensuer issuePoPrewards is only called once per PoP on all validators
 func (k msgServer) issuePoPRewards(_ types.Challenge) (err error) {
-	//cfg := config.GetConfig()
-	//client := osc.NewClient(cfg.WatchmenEndpoint, 1234)
+	// cfg := config.GetConfig()
+	// client := osc.NewClient(cfg.WatchmenEndpoint, 1234)
 
 	// TODO: finalize message and endpoint
-	//msg := osc.NewMessage("/rddl/token")
-	//msg.Append(challenge.Challenger)
-	//msg.Append(challenge.Challengee)
-	//err := client.Send(msg)
+	// msg := osc.NewMessage("/rddl/token")
+	// msg.Append(challenge.Challenger)
+	// msg.Append(challenge.Challengee)
+	// err := client.Send(msg)
 
 	return err
 }

x/machine/keeper/msg_server_attest_machine.go

@@ -46,7 +46,7 @@ func (k msgServer) AttestMachine(goCtx context.Context, msg *types.MsgAttestMach
 
 	if k.isNFTCreationRequest(msg.Machine) && util.IsValidatorBlockProposer(ctx, ctx.BlockHeader().ProposerAddress) {
 		_ = k.issueMachineNFT(ctx, msg.Machine)
-		//TODO create NFTCreationMessage to be stored by all nodes
+		// TODO create NFTCreationMessage to be stored by all nodes
 		// if err != nil {
 		// 	return nil, types.ErrNFTIssuanceFailed
 		// }
@@ -113,9 +113,9 @@ func (k msgServer) issueMachineNFT(ctx sdk.Context, machine *types.Machine) erro
 	_, _, err := k.issueNFTAsset(ctx, machine.Name, machine.Address)
 	return err
 	// asset registration is not performed in case of NFT issuance for machines
-	//assetID, contract, err := k.issueNFTAsset(machine.Name, machine.Address)
+	// assetID, contract, err := k.issueNFTAsset(machine.Name, machine.Address)
 	// if err != nil {
 	// 	return err
 	// }
-	//return k.registerAsset(assetID, contract)
+	// return k.registerAsset(assetID, contract)
 }