Merge PR cosmos#1424: tools: add unconvert linter

unconvert checks for unnecessary type conversions

CHANGELOG.md

@@ -38,6 +38,7 @@ FEATURES
   * misspell
   * gofmt
   * go vet -composites=false
+  * unconvert
 * [server] Default config now creates a profiler at port 6060, and increase p2p send/recv rates
 * [tests] Add WaitForNextNBlocksTM helper method
 * [types] Switches internal representation of Int/Uint/Rat to use pointers

Makefile

@@ -108,7 +108,7 @@ test_cover:
 	@bash tests/test_cover.sh
 
 test_lint:
-	gometalinter.v2 --disable-all --enable='golint' --enable='misspell' --linter='vet:go vet -composites=false:PATH:LINE:MESSAGE' --enable='vet' --vendor ./...
+	gometalinter.v2 --disable-all --enable='golint' --enable='misspell' --enable='unconvert' --linter='vet:go vet -composites=false:PATH:LINE:MESSAGE' --enable='vet' --vendor ./...
 	find . -name '*.go' -type f -not -path "./vendor*" -not -path "*.git*" | xargs gofmt -d -s
 
 benchmark:

client/context/helpers.go

@@ -127,8 +127,8 @@ func (ctx CoreContext) SignAndBuild(name, passphrase string, msgs []sdk.Msg, cdc
 
 	signMsg := auth.StdSignMsg{
 		ChainID:       chainID,
-		AccountNumber: int64(accnum),
-		Sequence:      int64(sequence),
+		AccountNumber: accnum,
+		Sequence:      sequence,
 		Msgs:          msgs,
 		Memo:          memo,
 		Fee:           auth.NewStdFee(ctx.Gas, sdk.Coin{}), // TODO run simulate to estimate gas?

client/lcd/version.go

@@ -24,6 +24,6 @@ func NodeVersionRequestHandler(cdc *wire.Codec, ctx context.CoreContext) http.Ha
 			w.Write([]byte(fmt.Sprintf("Could't query version. Error: %s", err.Error())))
 			return
 		}
-		w.Write([]byte(version))
+		w.Write(version)
 	}
 }

tests/util.go

@@ -104,7 +104,7 @@ func waitForHeight(height int64, url string) {
 		res.Body.Close()
 
 		var resultBlock ctypes.ResultBlock
-		err = cdc.UnmarshalJSON([]byte(body), &resultBlock)
+		err = cdc.UnmarshalJSON(body, &resultBlock)
 		if err != nil {
 			fmt.Println("RES", res)
 			fmt.Println("BODY", string(body))

tools/Makefile

@@ -7,9 +7,12 @@ all: get_tools
 DEP = github.com/golang/dep/cmd/dep
 GOLINT = github.com/tendermint/lint/golint
 GOMETALINTER = gopkg.in/alecthomas/gometalinter.v2
+UNCONVERT = github.com/mdempsky/unconvert
+
 DEP_CHECK := $(shell command -v dep 2> /dev/null)
 GOLINT_CHECK := $(shell command -v golint 2> /dev/null)
 GOMETALINTER_CHECK := $(shell command -v gometalinter.v2 2> /dev/null)
+UNCONVERT_CHECK := $(shell command -v unconvert 2> /dev/null)
 
 check_tools:
 ifndef DEP_CHECK
@@ -27,6 +30,11 @@ ifndef GOMETALINTER_CHECK
 else
 	@echo "Found gometalinter in path."
 endif
+ifndef UNCONVERT_CHECK
+	@echo "No unconvert in path.  Install with 'make get_tools'."
+else
+	@echo "Found unconvert in path."
+endif
 
 get_tools:
 ifdef DEP_CHECK
@@ -47,6 +55,12 @@ else
 	@echo "Installing gometalinter.v2"
 	go get -v $(GOMETALINTER)
 endif
+ifdef UNCONVERT_CHECK
+	@echo "Unconvert is already installed.  Run 'make update_tools' to update."
+else
+	@echo "Installing unconvert"
+	go get -v $(UNCONVERT)
+endif
 
 update_tools:
 	@echo "Updating dep"
@@ -55,6 +69,8 @@ update_tools:
 	go get -u -v $(GOLINT)
 	@echo "Updating gometalinter.v2"
 	go get -u -v $(GOMETALINTER)
+	@echo "Updating unconvert"
+	go get -u -v $(UNCONVERT)
 
 # To avoid unintended conflicts with file names, always add to .PHONY
 # unless there is a reason not to.

types/coin.go

@@ -244,11 +244,11 @@ func (coins Coins) AmountOf(denom string) Int {
 		midIdx := len(coins) / 2 // 2:1, 3:1, 4:2
 		coin := coins[midIdx]
 		if denom < coin.Denom {
-			return Coins(coins[:midIdx]).AmountOf(denom)
+			return coins[:midIdx].AmountOf(denom)
 		} else if denom == coin.Denom {
 			return coin.Amount
 		} else {
-			return Coins(coins[midIdx+1:]).AmountOf(denom)
+			return coins[midIdx+1:].AmountOf(denom)
 		}
 	}
 }

x/ibc/mapper.go

@@ -39,7 +39,7 @@ func (ibcm Mapper) PostIBCPacket(ctx sdk.Context, packet IBCPacket) sdk.Error {
 	}
 
 	store.Set(EgressKey(packet.DestChain, index), bz)
-	bz, err = ibcm.cdc.MarshalBinary(int64(index + 1))
+	bz, err = ibcm.cdc.MarshalBinary(index + 1)
 	if err != nil {
 		panic(err)
 	}

x/slashing/tick.go

@@ -22,11 +22,11 @@ func BeginBlocker(ctx sdk.Context, req abci.RequestBeginBlock, sk Keeper) (tags
 		if err != nil {
 			panic(err)
 		}
-		switch string(evidence.Type) {
+		switch evidence.Type {
 		case tmtypes.ABCIEvidenceTypeDuplicateVote:
 			sk.handleDoubleSign(ctx, evidence.Height, evidence.Time, pk)
 		default:
-			ctx.Logger().With("module", "x/slashing").Error(fmt.Sprintf("ignored unknown evidence type: %s", string(evidence.Type)))
+			ctx.Logger().With("module", "x/slashing").Error(fmt.Sprintf("ignored unknown evidence type: %s", evidence.Type))
 		}
 	}