Introduce staticcheck for stricter builds (#7035)

Makefile

@@ -14,43 +14,32 @@ checks:
 
 getdeps:
 	@echo "Installing golint" && go get -u golang.org/x/lint/golint
-	@echo "Installing gocyclo" && go get -u github.com/fzipp/gocyclo
-	@echo "Installing deadcode" && go get -u github.com/remyoudompheng/go-misc/deadcode
+	@echo "Installing staticcheck" && go get -u honnef.co/go/tools/...
 	@echo "Installing misspell" && go get -u github.com/client9/misspell/cmd/misspell
-	@echo "Installing ineffassign" && go get -u github.com/gordonklaus/ineffassign
 
 crosscompile:
 	@(env bash $(PWD)/buildscripts/cross-compile.sh)
 
-verifiers: getdeps vet fmt lint cyclo deadcode spelling
+verifiers: getdeps vet fmt lint staticcheck spelling
 
 vet:
 	@echo "Running $@"
-	@go tool vet cmd
-	@go tool vet pkg
+	@go vet github.com/minio/minio/...
 
 fmt:
 	@echo "Running $@"
-	@gofmt -d cmd
-	@gofmt -d pkg
+	@gofmt -d cmd/
+	@gofmt -d pkg/
 
 lint:
 	@echo "Running $@"
-	@${GOPATH}/bin/golint -set_exit_status github.com/minio/minio/cmd...
-	@${GOPATH}/bin/golint -set_exit_status github.com/minio/minio/pkg...
+	@${GOPATH}/bin/golint -set_exit_status github.com/minio/minio/cmd/...
+	@${GOPATH}/bin/golint -set_exit_status github.com/minio/minio/pkg/...
 
-ineffassign:
+staticcheck:
 	@echo "Running $@"
-	@${GOPATH}/bin/ineffassign .
-
-cyclo:
-	@echo "Running $@"
-	@${GOPATH}/bin/gocyclo -over 200 cmd
-	@${GOPATH}/bin/gocyclo -over 200 pkg
-
-deadcode:
-	@echo "Running $@"
-	@${GOPATH}/bin/deadcode -test $(shell go list ./...) || true
+	@${GOPATH}/bin/staticcheck github.com/minio/minio/cmd/...
+	@${GOPATH}/bin/staticcheck github.com/minio/minio/pkg/...
 
 spelling:
 	@${GOPATH}/bin/misspell -locale US -error `find cmd/`
@@ -105,6 +94,7 @@ install: build
 clean:
 	@echo "Cleaning up all the generated files"
 	@find . -name '*.test' | xargs rm -fv
+	@find . -name '*~' | xargs rm -fv
 	@rm -rvf minio
 	@rm -rvf build
 	@rm -rvf release

cmd/admin-handlers.go

@@ -381,7 +381,6 @@ func (a adminAPIHandlers) PerfInfoHandler(w http.ResponseWriter, r *http.Request
 	} else {
 		writeErrorResponseJSON(w, errorCodes.ToAPIErr(ErrMethodNotAllowed), r.URL)
 	}
-	return
 }
 
 func newLockEntry(l lockRequesterInfo, resource, server string) *madmin.LockEntry {
@@ -437,12 +436,20 @@ func (a adminAPIHandlers) TopLocksHandler(w http.ResponseWriter, r *http.Request
 		return
 	}
 
-	// Method only allowed in XL mode.
+	// Method only allowed in Distributed XL mode.
 	if !globalIsDistXL {
 		writeErrorResponseJSON(w, errorCodes.ToAPIErr(ErrMethodNotAllowed), r.URL)
 		return
 	}
 
+	// Authenticate request
+	// Setting the region as empty so as the mc server info command is irrespective to the region.
+	adminAPIErr := checkAdminRequestAuthType(ctx, r, "")
+	if adminAPIErr != ErrNone {
+		writeErrorResponseJSON(w, errorCodes.ToAPIErr(adminAPIErr), r.URL)
+		return
+	}
+
 	thisAddr, err := xnet.ParseHost(GetLocalPeer(globalEndpoints))
 	if err != nil {
 		writeErrorResponseJSON(w, toAdminAPIErr(ctx, err), r.URL)

cmd/admin-handlers_test.go

@@ -29,7 +29,6 @@ import (
 	"strings"
 	"sync"
 	"testing"
-	"time"
 
 	"github.com/gorilla/mux"
 	"github.com/minio/minio/pkg/auth"
@@ -231,7 +230,6 @@ var (
 // adminXLTestBed - encapsulates subsystems that need to be setup for
 // admin-handler unit tests.
 type adminXLTestBed struct {
-	configPath string
 	xlDirs   []string
 	objLayer ObjectLayer
 	router   *mux.Router
@@ -773,7 +771,7 @@ func TestSetConfigHandler(t *testing.T) {
 
 		rec := httptest.NewRecorder()
 		adminTestBed.router.ServeHTTP(rec, req)
-		respBody := string(rec.Body.Bytes())
+		respBody := rec.Body.String()
 		if rec.Code != http.StatusBadRequest ||
 			!strings.Contains(respBody, "Configuration data provided exceeds the allowed maximum of") {
 			t.Errorf("Got unexpected response code or body %d - %s", rec.Code, respBody)
@@ -792,7 +790,7 @@ func TestSetConfigHandler(t *testing.T) {
 
 		rec := httptest.NewRecorder()
 		adminTestBed.router.ServeHTTP(rec, req)
-		respBody := string(rec.Body.Bytes())
+		respBody := rec.Body.String()
 		if rec.Code != http.StatusBadRequest ||
 			!strings.Contains(respBody, "JSON configuration provided is of incorrect format") {
 			t.Errorf("Got unexpected response code or body %d - %s", rec.Code, respBody)
@@ -879,90 +877,3 @@ func TestToAdminAPIErrCode(t *testing.T) {
 		}
 	}
 }
-
-func mkHealStartReq(t *testing.T, bucket, prefix string,
-	opts madmin.HealOpts) *http.Request {
-
-	body, err := json.Marshal(opts)
-	if err != nil {
-		t.Fatalf("Unable marshal heal opts")
-	}
-
-	path := fmt.Sprintf("/minio/admin/v1/heal/%s", bucket)
-	if bucket != "" && prefix != "" {
-		path += "/" + prefix
-	}
-
-	req, err := newTestRequest("POST", path,
-		int64(len(body)), bytes.NewReader(body))
-	if err != nil {
-		t.Fatalf("Failed to construct request - %v", err)
-	}
-	cred := globalServerConfig.GetCredential()
-	err = signRequestV4(req, cred.AccessKey, cred.SecretKey)
-	if err != nil {
-		t.Fatalf("Failed to sign request - %v", err)
-	}
-
-	return req
-}
-
-func mkHealStatusReq(t *testing.T, bucket, prefix,
-	clientToken string) *http.Request {
-
-	path := fmt.Sprintf("/minio/admin/v1/heal/%s", bucket)
-	if bucket != "" && prefix != "" {
-		path += "/" + prefix
-	}
-	path += fmt.Sprintf("?clientToken=%s", clientToken)
-
-	req, err := newTestRequest("POST", path, 0, nil)
-	if err != nil {
-		t.Fatalf("Failed to construct request - %v", err)
-	}
-	cred := globalServerConfig.GetCredential()
-	err = signRequestV4(req, cred.AccessKey, cred.SecretKey)
-	if err != nil {
-		t.Fatalf("Failed to sign request - %v", err)
-	}
-
-	return req
-}
-
-func collectHealResults(t *testing.T, adminTestBed *adminXLTestBed, bucket,
-	prefix, clientToken string, timeLimitSecs int) madmin.HealTaskStatus {
-
-	var res, cur madmin.HealTaskStatus
-
-	// loop and fetch heal status. have a time-limit to loop over
-	// all statuses.
-	timeLimit := UTCNow().Add(time.Second * time.Duration(timeLimitSecs))
-	for cur.Summary != healStoppedStatus && cur.Summary != healFinishedStatus {
-		if UTCNow().After(timeLimit) {
-			t.Fatalf("heal-status loop took too long - clientToken: %s", clientToken)
-		}
-		req := mkHealStatusReq(t, bucket, prefix, clientToken)
-		rec := httptest.NewRecorder()
-		adminTestBed.router.ServeHTTP(rec, req)
-		if http.StatusOK != rec.Code {
-			t.Errorf("Unexpected status code - got %d but expected %d",
-				rec.Code, http.StatusOK)
-			break
-		}
-		err := json.NewDecoder(rec.Body).Decode(&cur)
-		if err != nil {
-			t.Errorf("unable to unmarshal resp: %v", err)
-			break
-		}
-
-		// all results are accumulated into a slice
-		// and returned to caller in the end
-		allItems := append(res.Items, cur.Items...)
-		res = cur
-		res.Items = allItems
-
-		time.Sleep(time.Millisecond * 200)
-	}
-
-	return res
-}

cmd/benchmark-utils_test.go

@@ -100,7 +100,6 @@ func runPutObjectPartBenchmark(b *testing.B, obj ObjectLayer, partSize int) {
 		b.Fatal(err)
 	}
 
-	md5hex := getMD5Hash(textData)
 	sha256hex := ""
 
 	var textPartData []byte
@@ -117,7 +116,7 @@ func runPutObjectPartBenchmark(b *testing.B, obj ObjectLayer, partSize int) {
 			} else {
 				textPartData = textData[j*partSize:]
 			}
-			md5hex = getMD5Hash([]byte(textPartData))
+			md5hex := getMD5Hash([]byte(textPartData))
 			var partInfo PartInfo
 			partInfo, err = obj.PutObjectPart(context.Background(), bucket, object, uploadID, j,
 				mustGetPutObjReader(b, bytes.NewBuffer(textPartData), int64(len(textPartData)), md5hex, sha256hex), ObjectOptions{})
@@ -230,10 +229,8 @@ func getRandomByte() []byte {
 	const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
 	// seeding the random number generator.
 	rand.Seed(UTCNow().UnixNano())
-	var b byte
 	// pick a character randomly.
-	b = letterBytes[rand.Intn(len(letterBytes))]
-	return []byte{b}
+	return []byte{letterBytes[rand.Intn(len(letterBytes))]}
 }
 
 // picks a random byte and repeats it to size bytes.

cmd/bitrot-streaming.go

@@ -146,7 +146,7 @@ func (b *streamingBitrotReader) ReadAt(buf []byte, offset int64) (int, error) {
 	}
 	b.h.Write(buf)
 
-	if bytes.Compare(b.h.Sum(nil), b.hashBytes) != 0 {
+	if !bytes.Equal(b.h.Sum(nil), b.hashBytes) {
 		err = hashMismatchError{hex.EncodeToString(b.hashBytes), hex.EncodeToString(b.h.Sum(nil))}
 		logger.LogIf(context.Background(), err)
 		return 0, err

cmd/bucket-handlers_test.go

@@ -95,12 +95,12 @@ func testGetBucketLocationHandler(obj ObjectLayer, instanceType, bucketName stri
 			t.Errorf("Test %d: %s: Expected the response status to be `%d`, but instead found `%d`", i+1, instanceType, testCase.expectedRespStatus, rec.Code)
 		}
 		if !bytes.Equal(testCase.locationResponse, rec.Body.Bytes()) && testCase.shouldPass {
-			t.Errorf("Test %d: %s: Expected the response to be `%s`, but instead found `%s`", i+1, instanceType, string(testCase.locationResponse), string(rec.Body.Bytes()))
+			t.Errorf("Test %d: %s: Expected the response to be `%s`, but instead found `%s`", i+1, instanceType, string(testCase.locationResponse), rec.Body.String())
 		}
 		errorResponse := APIErrorResponse{}
 		err = xml.Unmarshal(rec.Body.Bytes(), &errorResponse)
 		if err != nil && !testCase.shouldPass {
-			t.Fatalf("Test %d: %s: Unable to marshal response body %s", i+1, instanceType, string(rec.Body.Bytes()))
+			t.Fatalf("Test %d: %s: Unable to marshal response body %s", i+1, instanceType, rec.Body.String())
 		}
 		if errorResponse.Resource != testCase.errorResponse.Resource {
 			t.Errorf("Test %d: %s: Expected the error resource to be `%s`, but instead found `%s`", i+1, instanceType, testCase.errorResponse.Resource, errorResponse.Resource)
@@ -131,7 +131,7 @@ func testGetBucketLocationHandler(obj ObjectLayer, instanceType, bucketName stri
 		errorResponse = APIErrorResponse{}
 		err = xml.Unmarshal(recV2.Body.Bytes(), &errorResponse)
 		if err != nil && !testCase.shouldPass {
-			t.Fatalf("Test %d: %s: Unable to marshal response body %s", i+1, instanceType, string(recV2.Body.Bytes()))
+			t.Fatalf("Test %d: %s: Unable to marshal response body %s", i+1, instanceType, recV2.Body.String())
 		}
 		if errorResponse.Resource != testCase.errorResponse.Resource {
 			t.Errorf("Test %d: %s: Expected the error resource to be `%s`, but instead found `%s`", i+1, instanceType, testCase.errorResponse.Resource, errorResponse.Resource)

cmd/config-versions.go

@@ -263,9 +263,6 @@ type serverConfigV7 struct {
 
 	// Notification queue configuration.
 	Notify notifierV1 `json:"notify"`
-
-	// Read Write mutex.
-	rwMutex *sync.RWMutex
 }
 
 // serverConfigV8 server configuration version '8'. Adds NATS notifier
@@ -282,9 +279,6 @@ type serverConfigV8 struct {
 
 	// Notification queue configuration.
 	Notify notifierV1 `json:"notify"`
-
-	// Read Write mutex.
-	rwMutex *sync.RWMutex
 }
 
 // serverConfigV9 server configuration version '9'. Adds PostgreSQL
@@ -301,9 +295,6 @@ type serverConfigV9 struct {
 
 	// Notification queue configuration.
 	Notify notifierV1 `json:"notify"`
-
-	// Read Write mutex.
-	rwMutex *sync.RWMutex
 }
 
 type loggerV7 struct {

cmd/config.go

@@ -127,12 +127,8 @@ func (sys *ConfigSys) Init(objAPI ObjectLayer) error {
 	//    of the object layer.
 	//  - Write quorum not met when upgrading configuration
 	//    version is needed.
-	retryTimerCh := newRetryTimerSimple(doneCh)
-	for {
-		select {
-		case _ = <-retryTimerCh:
-			err := initConfig(objAPI)
-			if err != nil {
+	for range newRetryTimerSimple(doneCh) {
+		if err := initConfig(objAPI); err != nil {
 			if strings.Contains(err.Error(), InsufficientReadQuorum{}.Error()) ||
 				strings.Contains(err.Error(), InsufficientWriteQuorum{}.Error()) {
 				logger.Info("Waiting for configuration to be initialized..")
@@ -140,11 +136,10 @@ func (sys *ConfigSys) Init(objAPI ObjectLayer) error {
 			}
 			return err
 		}
-
+		break
+	}
 	return nil
 }
-	}
-}
 
 // NewConfigSys - creates new config system object.
 func NewConfigSys() *ConfigSys {

cmd/dummy-object-layer_test.go

@@ -1,167 +0,0 @@
-/*
- * Minio Cloud Storage, (C) 2018 Minio, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package cmd
-
-import (
-	"context"
-	"io"
-	"net/http"
-
-	"github.com/minio/minio/pkg/madmin"
-	"github.com/minio/minio/pkg/policy"
-)
-
-type DummyObjectLayer struct{}
-
-func (api *DummyObjectLayer) Shutdown(context.Context) (err error) {
-	return
-}
-
-func (api *DummyObjectLayer) StorageInfo(context.Context) (si StorageInfo) {
-	return
-}
-
-func (api *DummyObjectLayer) MakeBucketWithLocation(ctx context.Context, bucket string, location string) (err error) {
-	return
-}
-
-func (api *DummyObjectLayer) GetBucketInfo(ctx context.Context, bucket string) (bucketInfo BucketInfo, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) ListBuckets(ctx context.Context) (buckets []BucketInfo, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) DeleteBucket(ctx context.Context, bucket string) (err error) {
-	return
-}
-
-func (api *DummyObjectLayer) ListObjects(ctx context.Context, bucket, prefix, marker, delimiter string, maxKeys int) (result ListObjectsInfo, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) ListObjectsV2(ctx context.Context, bucket, prefix, continuationToken, delimiter string, maxKeys int, fetchOwner bool, startAfter string) (result ListObjectsV2Info, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) GetObjectNInfo(ctx context.Context, bucket, object string, rs *HTTPRangeSpec, h http.Header, lock LockType, opts ObjectOptions) (gr *GetObjectReader, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) GetObject(ctx context.Context, bucket, object string, startOffset int64, length int64, writer io.Writer, etag string, opts ObjectOptions) (err error) {
-	return
-}
-
-func (api *DummyObjectLayer) GetObjectInfo(ctx context.Context, bucket, object string, opts ObjectOptions) (objInfo ObjectInfo, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) PutObject(ctx context.Context, bucket, object string, data *PutObjReader, opts ObjectOptions) (objInfo ObjectInfo, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) CopyObject(ctx context.Context, srcBucket, srcObject, destBucket, destObject string, srcInfo ObjectInfo, srcOpts, dstOpts ObjectOptions) (objInfo ObjectInfo, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) DeleteObject(ctx context.Context, bucket, object string) (err error) {
-	return
-}
-
-func (api *DummyObjectLayer) ListMultipartUploads(ctx context.Context, bucket, prefix, keyMarker, uploadIDMarker, delimiter string, maxUploads int) (result ListMultipartsInfo, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) NewMultipartUpload(ctx context.Context, bucket, object string, opts ObjectOptions) (uploadID string, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) CopyObjectPart(ctx context.Context, srcBucket, srcObject, destBucket, destObject string, uploadID string, partID int, startOffset int64, length int64, srcInfo ObjectInfo, srcOpts, dstOpts ObjectOptions) (info PartInfo, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) PutObjectPart(ctx context.Context, bucket, object, uploadID string, partID int, data *PutObjReader, opts ObjectOptions) (info PartInfo, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) ListObjectParts(ctx context.Context, bucket, object, uploadID string, partNumberMarker int, maxParts int, opts ObjectOptions) (result ListPartsInfo, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) AbortMultipartUpload(ctx context.Context, bucket, object, uploadID string) (err error) {
-	return
-}
-
-func (api *DummyObjectLayer) CompleteMultipartUpload(ctx context.Context, bucket, object, uploadID string, uploadedParts []CompletePart, opts ObjectOptions) (objInfo ObjectInfo, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) ReloadFormat(ctx context.Context, dryRun bool) (err error) {
-	return
-}
-
-func (api *DummyObjectLayer) HealFormat(ctx context.Context, dryRun bool) (item madmin.HealResultItem, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) HealBucket(ctx context.Context, bucket string, dryRun, remove bool) (items madmin.HealResultItem, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) HealObject(ctx context.Context, bucket, object string, dryRun, remove bool) (item madmin.HealResultItem, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) ListBucketsHeal(ctx context.Context) (buckets []BucketInfo, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) ListObjectsHeal(ctx context.Context, bucket, prefix, marker, delimiter string, maxKeys int) (info ListObjectsInfo, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) SetBucketPolicy(context.Context, string, *policy.Policy) (err error) {
-	return
-}
-
-func (api *DummyObjectLayer) GetBucketPolicy(context.Context, string) (bucketPolicy *policy.Policy, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) RefreshBucketPolicy(context.Context, string) (err error) {
-	return
-}
-
-func (api *DummyObjectLayer) DeleteBucketPolicy(context.Context, string) (err error) {
-	return
-}
-
-func (api *DummyObjectLayer) IsNotificationSupported() (b bool) {
-	return
-}
-func (api *DummyObjectLayer) IsListenBucketSupported() (b bool) {
-	return
-}
-
-func (api *DummyObjectLayer) IsEncryptionSupported() (b bool) {
-	return
-}
-
-func (api *DummyObjectLayer) IsCompressionSupported() (b bool) {
-	return
-}

cmd/encryption-v1.go

@@ -742,7 +742,7 @@ func DecryptBlocksRequest(client io.Writer, r *http.Request, bucket, object stri
 		return writer, encStartOffset, encLength, nil
 	}
 
-	seqNumber, encStartOffset, encLength = getEncryptedMultipartsOffsetLength(startOffset, length, objInfo)
+	_, encStartOffset, encLength = getEncryptedMultipartsOffsetLength(startOffset, length, objInfo)
 
 	var partStartIndex int
 	var partStartOffset = startOffset

cmd/endpoint.go

@@ -94,7 +94,7 @@ func NewEndpoint(arg string) (ep Endpoint, e error) {
 		// - Scheme field must contain "http" or "https"
 		// - All field should be empty except Host and Path.
 		if !((u.Scheme == "http" || u.Scheme == "https") &&
-			u.User == nil && u.Opaque == "" && u.ForceQuery == false && u.RawQuery == "" && u.Fragment == "") {
+			u.User == nil && u.Opaque == "" && !u.ForceQuery && u.RawQuery == "" && u.Fragment == "") {
 			return ep, fmt.Errorf("invalid URL endpoint format")
 		}
 

cmd/erasure-decode_test.go

@@ -28,7 +28,7 @@ import (
 	humanize "github.com/dustin/go-humanize"
 )
 
-func (d badDisk) ReadFile(volume string, path string, offset int64, buf []byte, verifier *BitrotVerifier) (n int64, err error) {
+func (a badDisk) ReadFile(volume string, path string, offset int64, buf []byte, verifier *BitrotVerifier) (n int64, err error) {
 	return 0, errFaultyDisk
 }
 

cmd/format-fs.go

@@ -341,35 +341,35 @@ func formatFSFixDeploymentID(fsFormatPath string) error {
 	doneCh := make(chan struct{})
 	defer close(doneCh)
 
-	retryTimerCh := newRetryTimerSimple(doneCh)
-	for {
-		select {
-		case <-retryTimerCh:
-
-			wlk, err := lock.TryLockedOpenFile(fsFormatPath, os.O_RDWR, 0)
+	var wlk *lock.LockedFile
+	for range newRetryTimerSimple(doneCh) {
+		wlk, err = lock.TryLockedOpenFile(fsFormatPath, os.O_RDWR, 0)
 		if err == lock.ErrAlreadyLocked {
 			// Lock already present, sleep and attempt again
-
 			logger.Info("Another minio process(es) might be holding a lock to the file %s. Please kill that minio process(es) (elapsed %s)\n", fsFormatPath, getElapsedTime())
 			continue
 		}
 		if err != nil {
-				return err
-			}
-			defer wlk.Close()
-
-			err = jsonLoad(wlk, format)
-			if err != nil {
-				return err
+			break
 		}
 
-			// Check if it needs to be updated
+		if err = jsonLoad(wlk, format); err != nil {
+			break
+		}
+
+		// Check if format needs to be updated
 		if format.ID != "" {
-				return nil
-			}
-			format.ID = mustGetUUID()
-			return jsonSave(wlk, format)
-		}
+			err = nil
+			break
 		}
 
+		format.ID = mustGetUUID()
+		if err = jsonSave(wlk, format); err != nil {
+			break
+		}
+	}
+	if wlk != nil {
+		wlk.Close()
+	}
+	return err
 }

cmd/format-xl_test.go

@@ -522,7 +522,7 @@ func TestGetXLID(t *testing.T) {
 	}
 
 	formats[2].ID = "bad-id"
-	if id, err = formatXLGetDeploymentID(quorumFormat, formats); err != errCorruptedFormat {
+	if _, err = formatXLGetDeploymentID(quorumFormat, formats); err != errCorruptedFormat {
 		t.Fatal("Unexpected Success")
 	}
 }

cmd/fs-v1-helpers.go

@@ -294,7 +294,7 @@ func fsOpenFile(ctx context.Context, readPath string, offset int64) (io.ReadClos
 
 	// Seek to the requested offset.
 	if offset > 0 {
-		_, err = fr.Seek(offset, os.SEEK_SET)
+		_, err = fr.Seek(offset, io.SeekStart)
 		if err != nil {
 			logger.LogIf(ctx, err)
 			return nil, 0, err

cmd/fs-v1.go

@@ -532,8 +532,7 @@ func (fs *FSObjects) GetObjectNInfo(ctx context.Context, bucket, object string,
 		nsUnlocker()
 		return nil, toObjectErr(err, bucket, object)
 	}
-	var reader io.Reader
-	reader = io.LimitReader(readCloser, length)
+	reader := io.LimitReader(readCloser, length)
 	closeFn := func() {
 		readCloser.Close()
 	}

cmd/gateway/azure/gateway-azure.go

@@ -740,6 +740,9 @@ func (a *azureObjects) PutObject(ctx context.Context, bucket, object string, r *
 	if data.Size() < azureBlockSize/10 {
 		blob := a.client.GetContainerReference(bucket).GetBlobReference(object)
 		blob.Metadata, blob.Properties, err = s3MetaToAzureProperties(ctx, opts.UserDefined)
+		if err != nil {
+			return objInfo, azureToObjectError(err, bucket, object)
+		}
 		if err = blob.CreateBlockBlobFromReader(data, nil); err != nil {
 			return objInfo, azureToObjectError(err, bucket, object)
 		}

cmd/gateway/gcs/gateway-gcs.go

@@ -888,6 +888,7 @@ func (l *gcsGateway) PutObject(ctx context.Context, bucket string, key string, r
 	object := l.client.Bucket(bucket).Object(key)
 
 	w := object.NewWriter(ctx)
+
 	// Disable "chunked" uploading in GCS client if the size of the data to be uploaded is below
 	// the current chunk-size of the writer. This avoids an unnecessary memory allocation.
 	if data.Size() < int64(w.ChunkSize) {

cmd/gateway/oss/gateway-oss_test.go

@@ -111,9 +111,8 @@ func TestOSSToObjectError(t *testing.T) {
 
 func TestS3MetaToOSSOptions(t *testing.T) {
 	var err error
-	var headers map[string]string
 
-	headers = map[string]string{
+	headers := map[string]string{
 		"x-amz-meta-invalid_meta": "value",
 	}
 	_, err = appendS3MetaToOSSOptions(context.Background(), nil, headers)

cmd/handler-utils.go

@@ -367,11 +367,9 @@ func getResource(path string, host string, domain string) (string, error) {
 // If none of the http routes match respond with MethodNotAllowed, in JSON
 func notFoundHandlerJSON(w http.ResponseWriter, r *http.Request) {
 	writeErrorResponseJSON(w, errorCodes.ToAPIErr(ErrMethodNotAllowed), r.URL)
-	return
 }
 
 // If none of the http routes match respond with MethodNotAllowed
 func notFoundHandler(w http.ResponseWriter, r *http.Request) {
 	writeErrorResponse(w, errorCodes.ToAPIErr(ErrMethodNotAllowed), r.URL, guessIsBrowserReq(r))
-	return
 }

cmd/healthcheck-handler_test.go

@@ -34,7 +34,7 @@ func TestGoroutineCountCheck(t *testing.T) {
 		// Make goroutines -- to make sure number of go-routines is higher than threshold
 		if tt.threshold == 5 || tt.threshold == 6 {
 			for i := 0; i < 6; i++ {
-				go time.Sleep(5)
+				go time.Sleep(5 * time.Nanosecond)
 			}
 		}
 		if err := goroutineCountCheck(tt.threshold); (err != nil) != tt.wantErr {

cmd/http/close.go

@@ -19,16 +19,8 @@ package http
 import (
 	"io"
 	"io/ioutil"
-	"sync"
 )
 
-var b512pool = sync.Pool{
-	New: func() interface{} {
-		buf := make([]byte, 512)
-		return &buf
-	},
-}
-
 // DrainBody close non nil response with any response Body.
 // convenient wrapper to drain any remaining data on response body.
 //

cmd/iam.go

@@ -94,10 +94,7 @@ func (sys *IAMSys) Init(objAPI ObjectLayer) error {
 	// the following reasons:
 	//  - Read quorum is lost just after the initialization
 	//    of the object layer.
-	retryTimerCh := newRetryTimerSimple(doneCh)
-	for {
-		select {
-		case _ = <-retryTimerCh:
+	for range newRetryTimerSimple(doneCh) {
 		// Load IAMSys once during boot.
 		if err := sys.refresh(objAPI); err != nil {
 			if err == errDiskNotFound ||
@@ -108,10 +105,10 @@ func (sys *IAMSys) Init(objAPI ObjectLayer) error {
 			}
 			return err
 		}
+		break
+	}
 	return nil
 }
-	}
-}
 
 // DeleteCannedPolicy - deletes a canned policy.
 func (sys *IAMSys) DeleteCannedPolicy(policyName string) error {

cmd/local-locker.go

@@ -145,11 +145,9 @@ func (l *localLocker) ForceUnlock(args dsync.LockArgs) (reply bool, err error) {
 	if len(args.UID) != 0 {
 		return false, fmt.Errorf("ForceUnlock called with non-empty UID: %s", args.UID)
 	}
-	if _, ok := l.lockMap[args.Resource]; ok {
 	// Only clear lock when it is taken
 	// Remove the lock (irrespective of write or read lock)
 	delete(l.lockMap, args.Resource)
-	}
 	return true, nil
 }
 
@@ -159,11 +157,7 @@ func (l *localLocker) DupLockMap() map[string][]lockRequesterInfo {
 
 	lockCopy := make(map[string][]lockRequesterInfo)
 	for k, v := range l.lockMap {
-		var lockSlice []lockRequesterInfo
-		for _, lockInfo := range v {
-			lockSlice = append(lockSlice, lockInfo)
-		}
-		lockCopy[k] = lockSlice
+		lockCopy[k] = append(lockCopy[k], v...)
 	}
 	return lockCopy
 }

cmd/lock-rpc-server-common_test.go

@@ -41,7 +41,7 @@ func TestLockRpcServerRemoveEntryIfExists(t *testing.T) {
 	// first test by simulating item has already been deleted
 	locker.ll.removeEntryIfExists(nlrip)
 	{
-		gotLri, _ := locker.ll.lockMap["name"]
+		gotLri := locker.ll.lockMap["name"]
 		expectedLri := []lockRequesterInfo(nil)
 		if !reflect.DeepEqual(expectedLri, gotLri) {
 			t.Errorf("Expected %#v, got %#v", expectedLri, gotLri)
@@ -52,7 +52,7 @@ func TestLockRpcServerRemoveEntryIfExists(t *testing.T) {
 	locker.ll.lockMap["name"] = []lockRequesterInfo{lri} // add item
 	locker.ll.removeEntryIfExists(nlrip)
 	{
-		gotLri, _ := locker.ll.lockMap["name"]
+		gotLri := locker.ll.lockMap["name"]
 		expectedLri := []lockRequesterInfo(nil)
 		if !reflect.DeepEqual(expectedLri, gotLri) {
 			t.Errorf("Expected %#v, got %#v", expectedLri, gotLri)
@@ -87,7 +87,7 @@ func TestLockRpcServerRemoveEntry(t *testing.T) {
 		lockRequesterInfo2,
 	}
 
-	lri, _ := locker.ll.lockMap["name"]
+	lri := locker.ll.lockMap["name"]
 
 	// test unknown uid
 	if locker.ll.removeEntry("name", "unknown-uid", &lri) {
@@ -97,7 +97,7 @@ func TestLockRpcServerRemoveEntry(t *testing.T) {
 	if !locker.ll.removeEntry("name", "0123-4567", &lri) {
 		t.Errorf("Expected %#v, got %#v", true, false)
 	} else {
-		gotLri, _ := locker.ll.lockMap["name"]
+		gotLri := locker.ll.lockMap["name"]
 		expectedLri := []lockRequesterInfo{lockRequesterInfo2}
 		if !reflect.DeepEqual(expectedLri, gotLri) {
 			t.Errorf("Expected %#v, got %#v", expectedLri, gotLri)
@@ -107,7 +107,7 @@ func TestLockRpcServerRemoveEntry(t *testing.T) {
 	if !locker.ll.removeEntry("name", "89ab-cdef", &lri) {
 		t.Errorf("Expected %#v, got %#v", true, false)
 	} else {
-		gotLri, _ := locker.ll.lockMap["name"]
+		gotLri := locker.ll.lockMap["name"]
 		expectedLri := []lockRequesterInfo(nil)
 		if !reflect.DeepEqual(expectedLri, gotLri) {
 			t.Errorf("Expected %#v, got %#v", expectedLri, gotLri)

cmd/lock-rpc-server_test.go

@@ -94,7 +94,7 @@ func TestLockRpcServerLock(t *testing.T) {
 		if !result {
 			t.Errorf("Expected %#v, got %#v", true, result)
 		} else {
-			gotLri, _ := locker.ll.lockMap["name"]
+			gotLri := locker.ll.lockMap["name"]
 			expectedLri := []lockRequesterInfo{
 				{
 					Writer:          true,
@@ -174,7 +174,7 @@ func TestLockRpcServerUnlock(t *testing.T) {
 		if !result {
 			t.Errorf("Expected %#v, got %#v", true, result)
 		} else {
-			gotLri, _ := locker.ll.lockMap["name"]
+			gotLri := locker.ll.lockMap["name"]
 			expectedLri := []lockRequesterInfo(nil)
 			if !testLockEquality(expectedLri, gotLri) {
 				t.Errorf("Expected %#v, got %#v", expectedLri, gotLri)
@@ -210,7 +210,7 @@ func TestLockRpcServerRLock(t *testing.T) {
 		if !result {
 			t.Errorf("Expected %#v, got %#v", true, result)
 		} else {
-			gotLri, _ := locker.ll.lockMap["name"]
+			gotLri := locker.ll.lockMap["name"]
 			expectedLri := []lockRequesterInfo{
 				{
 					Writer:          false,
@@ -312,7 +312,7 @@ func TestLockRpcServerRUnlock(t *testing.T) {
 		if !result {
 			t.Errorf("Expected %#v, got %#v", true, result)
 		} else {
-			gotLri, _ := locker.ll.lockMap["name"]
+			gotLri := locker.ll.lockMap["name"]
 			expectedLri := []lockRequesterInfo{
 				{
 					Writer:          false,
@@ -336,7 +336,7 @@ func TestLockRpcServerRUnlock(t *testing.T) {
 		if !result {
 			t.Errorf("Expected %#v, got %#v", true, result)
 		} else {
-			gotLri, _ := locker.ll.lockMap["name"]
+			gotLri := locker.ll.lockMap["name"]
 			expectedLri := []lockRequesterInfo(nil)
 			if !testLockEquality(expectedLri, gotLri) {
 				t.Errorf("Expected %#v, got %#v", expectedLri, gotLri)
@@ -531,9 +531,6 @@ func TestLockServerInit(t *testing.T) {
 		globalIsDistXL = testCase.isDistXL
 		globalLockServer = nil
 		_, _ = newDsyncNodes(testCase.endpoints)
-		if err != nil {
-			t.Fatalf("Got unexpected error initializing lock servers: %v", err)
-		}
 		if globalLockServer == nil && testCase.isDistXL {
 			t.Errorf("Test %d: Expected initialized lock RPC receiver, but got uninitialized", i+1)
 		}

cmd/lock-stat.go

@@ -1,55 +0,0 @@
-/*
- * Minio Cloud Storage, (C) 2016 Minio, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package cmd
-
-// lockStat - encapsulates total, blocked and granted lock counts.
-type lockStat struct {
-	total   int64
-	blocked int64
-	granted int64
-}
-
-// lockWaiting - updates lock stat when a lock becomes blocked.
-func (ls *lockStat) lockWaiting() {
-	ls.blocked++
-	ls.total++
-}
-
-// lockGranted - updates lock stat when a lock is granted.
-func (ls *lockStat) lockGranted() {
-	ls.blocked--
-	ls.granted++
-}
-
-// lockTimedOut - updates lock stat when a lock is timed out.
-func (ls *lockStat) lockTimedOut() {
-	ls.blocked--
-	ls.total--
-}
-
-// lockRemoved - updates lock stat when a lock is removed, by Unlock
-// or ForceUnlock.
-func (ls *lockStat) lockRemoved(granted bool) {
-	if granted {
-		ls.granted--
-		ls.total--
-
-	} else {
-		ls.blocked--
-		ls.total--
-	}
-}

cmd/logger/logonce.go

@@ -56,12 +56,11 @@ func (l *logOnceType) logOnceIf(ctx context.Context, err error, id interface{})
 // Cleanup the map every 30 minutes so that the log message is printed again for the user to notice.
 func (l *logOnceType) cleanupRoutine() {
 	for {
-		select {
-		case <-time.After(time.Minute * 30):
 		l.Lock()
 		l.IDMap = make(map[interface{}]error)
 		l.Unlock()
-		}
+
+		time.Sleep(30 * time.Minute)
 	}
 }
 

cmd/logger/target/http/http.go

@@ -50,6 +50,9 @@ func (h *Target) startHTTPLogger() {
 			}
 
 			req, err := gohttp.NewRequest("POST", h.endpoint, bytes.NewBuffer(logJSON))
+			if err != nil {
+				continue
+			}
 			req.Header.Set("Content-Type", "application/json")
 
 			resp, err := h.client.Do(req)

cmd/namespace-lock.go

@@ -102,7 +102,6 @@ func newNSLock(isDistXL bool) *nsLockMap {
 	nsMutex := nsLockMap{
 		isDistXL: isDistXL,
 		lockMap:  make(map[nsParam]*nsLock),
-		counters: &lockStat{},
 	}
 	return &nsMutex
 }
@@ -127,9 +126,6 @@ type nsLock struct {
 // nsLockMap - namespace lock map, provides primitives to Lock,
 // Unlock, RLock and RUnlock.
 type nsLockMap struct {
-	// Lock counter used for lock debugging.
-	counters *lockStat
-
 	// Indicates if namespace is part of a distributed setup.
 	isDistXL     bool
 	lockMap      map[nsParam]*nsLock
@@ -259,11 +255,8 @@ func (n *nsLockMap) ForceUnlock(volume, path string) {
 		dsync.NewDRWMutex(pathJoin(volume, path), globalDsync).ForceUnlock()
 	}
 
-	param := nsParam{volume, path}
-	if _, found := n.lockMap[param]; found {
 	// Remove lock from the map.
-		delete(n.lockMap, param)
-	}
+	delete(n.lockMap, nsParam{volume, path})
 }
 
 // lockInstance - frontend/top-level interface for namespace locks.

cmd/namespace-lock_test.go

@@ -47,7 +47,6 @@ func TestNamespaceLockTest(t *testing.T) {
 		unlk             func(s1, s2, s3 string)
 		rlk              func(s1, s2, s3 string, t time.Duration) bool
 		runlk            func(s1, s2, s3 string)
-		lkCount          int
 		lockedRefCount   uint
 		unlockedRefCount uint
 		shouldPass       bool

cmd/notification.go

@@ -271,6 +271,9 @@ func (sys *NotificationSys) DownloadProfilingData(ctx context.Context, writer io
 		isDir:   false,
 		sys:     nil,
 	})
+	if zerr != nil {
+		return profilingDataFound
+	}
 
 	zwriter, zerr := zipWriter.CreateHeader(header)
 	if zerr != nil {
@@ -602,10 +605,7 @@ func (sys *NotificationSys) Init(objAPI ObjectLayer) error {
 	// the following reasons:
 	//  - Read quorum is lost just after the initialization
 	//    of the object layer.
-	retryTimerCh := newRetryTimerSimple(doneCh)
-	for {
-		select {
-		case _ = <-retryTimerCh:
+	for range newRetryTimerSimple(doneCh) {
 		if err := sys.refresh(objAPI); err != nil {
 			if err == errDiskNotFound ||
 				strings.Contains(err.Error(), InsufficientReadQuorum{}.Error()) ||
@@ -615,10 +615,10 @@ func (sys *NotificationSys) Init(objAPI ObjectLayer) error {
 			}
 			return err
 		}
+		break
+	}
 	return nil
 }
-	}
-}
 
 // AddRulesMap - adds rules map for bucket name.
 func (sys *NotificationSys) AddRulesMap(bucketName string, rulesMap event.RulesMap) {

cmd/object-handlers-common.go

@@ -211,10 +211,7 @@ func checkPreconditions(w http.ResponseWriter, r *http.Request, objInfo ObjectIn
 func ifModifiedSince(objTime time.Time, givenTime time.Time) bool {
 	// The Date-Modified header truncates sub-second precision, so
 	// use mtime < t+1s instead of mtime <= t to check for unmodified.
-	if objTime.After(givenTime.Add(1 * time.Second)) {
-		return true
-	}
-	return false
+	return objTime.After(givenTime.Add(1 * time.Second))
 }
 
 // canonicalizeETag returns ETag with leading and trailing double-quotes removed,

cmd/object-handlers.go

@@ -838,7 +838,7 @@ func (api objectAPIHandlers) CopyObjectHandler(w http.ResponseWriter, r *http.Re
 		reader = pipeReader
 		length = -1
 
-		snappyWriter := snappy.NewWriter(pipeWriter)
+		snappyWriter := snappy.NewBufferedWriter(pipeWriter)
 
 		go func() {
 			// Compress the decompressed source object.
@@ -1217,7 +1217,7 @@ func (api objectAPIHandlers) PutObjectHandler(w http.ResponseWriter, r *http.Req
 		metadata[ReservedMetadataPrefix+"actual-size"] = strconv.FormatInt(size, 10)
 
 		pipeReader, pipeWriter := io.Pipe()
-		snappyWriter := snappy.NewWriter(pipeWriter)
+		snappyWriter := snappy.NewBufferedWriter(pipeWriter)
 
 		var actualReader *hash.Reader
 		actualReader, err = hash.NewReader(reader, size, md5hex, sha256hex, actualSize)
@@ -1660,7 +1660,7 @@ func (api objectAPIHandlers) CopyObjectPartHandler(w http.ResponseWriter, r *htt
 		reader = pipeReader
 		length = -1
 
-		snappyWriter := snappy.NewWriter(pipeWriter)
+		snappyWriter := snappy.NewBufferedWriter(pipeWriter)
 
 		go func() {
 			// Compress the decompressed source object.
@@ -1902,7 +1902,7 @@ func (api objectAPIHandlers) PutObjectPartHandler(w http.ResponseWriter, r *http
 	isCompressed := false
 	if objectAPI.IsCompressionSupported() && compressPart {
 		pipeReader, pipeWriter = io.Pipe()
-		snappyWriter := snappy.NewWriter(pipeWriter)
+		snappyWriter := snappy.NewBufferedWriter(pipeWriter)
 
 		var actualReader *hash.Reader
 		actualReader, err = hash.NewReader(reader, size, md5hex, sha256hex, actualSize)

cmd/object-handlers_test.go

@@ -855,6 +855,7 @@ func testAPIPutObjectStreamSigV4Handler(obj ObjectLayer, instanceType, bucketNam
 			accessKey:          credentials.AccessKey,
 			secretKey:          credentials.SecretKey,
 			shouldPass:         true,
+			fault:              None,
 		},
 		// Test case - 2
 		// Small chunk size.
@@ -869,6 +870,7 @@ func testAPIPutObjectStreamSigV4Handler(obj ObjectLayer, instanceType, bucketNam
 			accessKey:          credentials.AccessKey,
 			secretKey:          credentials.SecretKey,
 			shouldPass:         true,
+			fault:              None,
 		},
 		// Test case - 3
 		// Empty data
@@ -897,6 +899,7 @@ func testAPIPutObjectStreamSigV4Handler(obj ObjectLayer, instanceType, bucketNam
 			accessKey:          "",
 			secretKey:          "",
 			shouldPass:         false,
+			fault:              None,
 		},
 		// Test case - 5
 		// Wrong auth header returns as bad request.
@@ -912,6 +915,7 @@ func testAPIPutObjectStreamSigV4Handler(obj ObjectLayer, instanceType, bucketNam
 			secretKey:          credentials.SecretKey,
 			shouldPass:         false,
 			removeAuthHeader:   true,
+			fault:              None,
 		},
 		// Test case - 6
 		// Large chunk size.. also passes.
@@ -926,6 +930,7 @@ func testAPIPutObjectStreamSigV4Handler(obj ObjectLayer, instanceType, bucketNam
 			accessKey:          credentials.AccessKey,
 			secretKey:          credentials.SecretKey,
 			shouldPass:         true,
+			fault:              None,
 		},
 		// Test case - 7
 		// Chunk with malformed encoding.
@@ -1017,6 +1022,7 @@ func testAPIPutObjectStreamSigV4Handler(obj ObjectLayer, instanceType, bucketNam
 			secretKey:          credentials.SecretKey,
 			shouldPass:         true,
 			contentEncoding:    "aws-chunked,gzip",
+			fault:              None,
 		},
 	}
 	// Iterating over the cases, fetching the object validating the response.

cmd/object_api_suite_test.go

@@ -465,7 +465,7 @@ func testObjectOverwriteWorks(obj ObjectLayer, instanceType string, t TestErrHan
 	if err != nil {
 		t.Fatalf("%s: <ERROR> %s", instanceType, err)
 	}
-	if string(bytesBuffer.Bytes()) != "The specified multipart upload does not exist. The upload ID might be invalid, or the multipart upload might have been aborted or completed." {
+	if bytesBuffer.String() != "The specified multipart upload does not exist. The upload ID might be invalid, or the multipart upload might have been aborted or completed." {
 		t.Errorf("%s: Invalid upload ID error mismatch.", instanceType)
 	}
 }

cmd/policy.go

@@ -158,10 +158,7 @@ func (sys *PolicySys) Init(objAPI ObjectLayer) error {
 	// the following reasons:
 	//  - Read quorum is lost just after the initialization
 	//    of the object layer.
-	retryTimerCh := newRetryTimerSimple(doneCh)
-	for {
-		select {
-		case _ = <-retryTimerCh:
+	for range newRetryTimerSimple(doneCh) {
 		// Load PolicySys once during boot.
 		if err := sys.refresh(objAPI); err != nil {
 			if err == errDiskNotFound ||
@@ -172,10 +169,10 @@ func (sys *PolicySys) Init(objAPI ObjectLayer) error {
 			}
 			return err
 		}
+		break
+	}
 	return nil
 }
-	}
-}
 
 // NewPolicySys - creates new policy system.
 func NewPolicySys() *PolicySys {

cmd/posix.go

@@ -860,7 +860,7 @@ func (s *posix) ReadFile(volume, path string, offset int64, buffer []byte, verif
 		return 0, err
 	}
 
-	if bytes.Compare(h.Sum(nil), verifier.sum) != 0 {
+	if !bytes.Equal(h.Sum(nil), verifier.sum) {
 		return 0, hashMismatchError{hex.EncodeToString(verifier.sum), hex.EncodeToString(h.Sum(nil))}
 	}
 

cmd/posix_test.go

@@ -188,7 +188,7 @@ func TestPosixIsDirEmpty(t *testing.T) {
 
 	// Should give false on non-existent directory.
 	dir1 := slashpath.Join(tmp, "non-existent-directory")
-	if isDirEmpty(dir1) != false {
+	if isDirEmpty(dir1) {
 		t.Error("expected false for non-existent directory, got true")
 	}
 
@@ -199,7 +199,7 @@ func TestPosixIsDirEmpty(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	if isDirEmpty(dir2) != false {
+	if isDirEmpty(dir2) {
 		t.Error("expected false for a file, got true")
 	}
 
@@ -210,7 +210,7 @@ func TestPosixIsDirEmpty(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	if isDirEmpty(dir3) != true {
+	if !isDirEmpty(dir3) {
 		t.Error("expected true for empty dir, got false")
 	}
 }

cmd/rpc/pool.go

@@ -21,13 +21,6 @@ import (
 	"sync"
 )
 
-var b512pool = sync.Pool{
-	New: func() interface{} {
-		buf := make([]byte, 512)
-		return &buf
-	},
-}
-
 // A Pool is a type-safe wrapper around a sync.Pool.
 type Pool struct {
 	p *sync.Pool

cmd/rpc/server_test.go

@@ -77,11 +77,6 @@ func (t mytype) Foo(a *Auth, b *int) error {
 	return nil
 }
 
-// incompatible method because of unexported method.
-func (t mytype) foo(a *Auth, b *int) error {
-	return nil
-}
-
 // incompatible method because of first argument is not Authenticator.
 func (t *mytype) Bar(a, b *int) error {
 	return nil

cmd/rpc_test.go

@@ -286,9 +286,7 @@ func TestRPCClientCall(t *testing.T) {
 
 	testCases := []struct {
 		serviceMethod  string
-		args          interface {
-			SetAuthArgs(args AuthArgs)
-		}
+		args           *Args
 		result         interface{}
 		changeConfig   bool
 		expectedResult interface{}

cmd/signature-v4-parser.go

@@ -186,9 +186,8 @@ func doesV4PresignParamsExist(query url.Values) APIErrorCode {
 
 // Parses all the presigned signature values into separate elements.
 func parsePreSignV4(query url.Values, region string) (psv preSignValues, aec APIErrorCode) {
-	var err APIErrorCode
 	// verify whether the required query params exist.
-	err = doesV4PresignParamsExist(query)
+	err := doesV4PresignParamsExist(query)
 	if err != ErrNone {
 		return psv, err
 	}

cmd/test-utils_test.go

@@ -306,7 +306,6 @@ type TestServer struct {
 	SecretKey string
 	Server    *httptest.Server
 	Obj       ObjectLayer
-	endpoints EndpointList
 }
 
 // UnstartedTestServer - Configures a temp FS/XL backend,
@@ -949,7 +948,7 @@ func preSignV2(req *http.Request, accessKeyID, secretAccessKey string, expires i
 
 // Sign given request using Signature V2.
 func signRequestV2(req *http.Request, accessKey, secretKey string) error {
-	req = s3signer.SignV2(*req, accessKey, secretKey, false)
+	s3signer.SignV2(*req, accessKey, secretKey, false)
 	return nil
 }
 
@@ -1305,36 +1304,6 @@ func getRandomBucketName() string {
 
 }
 
-// TruncateWriter - Writes `n` bytes, then returns with number of bytes written.
-// differs from iotest.TruncateWriter, the difference is commented in the Write method.
-func TruncateWriter(w io.Writer, n int64) io.Writer {
-	return &truncateWriter{w, n}
-}
-
-type truncateWriter struct {
-	w io.Writer
-	n int64
-}
-
-func (t *truncateWriter) Write(p []byte) (n int, err error) {
-	if t.n <= 0 {
-		return len(p), nil
-	}
-	// real write
-	n = len(p)
-	if int64(n) > t.n {
-		n = int(t.n)
-	}
-	n, err = t.w.Write(p[0:n])
-	t.n -= int64(n)
-	// Removed from iotest.TruncateWriter.
-	// Need the Write method to return truncated number of bytes written, not the size of the buffer requested to be written.
-	// if err == nil {
-	// 	n = len(p)
-	// }
-	return
-}
-
 // NewEOFWriter returns a Writer that writes to w,
 // but returns EOF error after writing n bytes.
 func NewEOFWriter(w io.Writer, n int64) io.Writer {
@@ -1696,11 +1665,10 @@ func initAPIHandlerTest(obj ObjectLayer, endpoints []string) (string, http.Handl
 	// Register the API end points with XL object layer.
 	// Registering only the GetObject handler.
 	apiRouter := initTestAPIEndPoints(obj, endpoints)
-	var f http.HandlerFunc
-	f = func(w http.ResponseWriter, r *http.Request) {
+	f := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		r.RequestURI = r.URL.RequestURI()
 		apiRouter.ServeHTTP(w, r)
-	}
+	})
 	return bucketName, f, nil
 }
 
@@ -2173,40 +2141,6 @@ func initTestWebRPCEndPoint(objLayer ObjectLayer) http.Handler {
 	return muxRouter
 }
 
-func StartTestS3PeerRPCServer(t TestErrHandler) (TestServer, []string) {
-	// init disks
-	objLayer, fsDirs, err := prepareXL16()
-	if err != nil {
-		t.Fatalf("%s", err)
-	}
-
-	// Create an instance of TestServer.
-	testRPCServer := TestServer{}
-
-	if err = newTestConfig(globalMinioDefaultRegion, objLayer); err != nil {
-		t.Fatalf("%s", err)
-	}
-
-	// Fetch credentials for the test server.
-	credentials := globalServerConfig.GetCredential()
-	testRPCServer.AccessKey = credentials.AccessKey
-	testRPCServer.SecretKey = credentials.SecretKey
-
-	// set object layer
-	testRPCServer.Obj = objLayer
-	globalObjLayerMutex.Lock()
-	globalObjectAPI = objLayer
-	globalObjLayerMutex.Unlock()
-
-	// Register router on a new mux
-	muxRouter := mux.NewRouter().SkipClean(true)
-	registerPeerRPCRouter(muxRouter)
-
-	// Initialize and run the TestServer.
-	testRPCServer.Server = httptest.NewServer(muxRouter)
-	return testRPCServer, fsDirs
-}
-
 // generateTLSCertKey creates valid key/cert with registered DNS or IP address
 // depending on the passed parameter. That way, we can use tls config without
 // passing InsecureSkipVerify flag.  This code is a simplified version of

cmd/utils.go

@@ -228,11 +228,7 @@ func getProfileData() ([]byte, error) {
 }
 
 // Starts a profiler returns nil if profiler is not enabled, caller needs to handle this.
-func startProfiler(profilerType, dirPath string) (interface {
-	Stop()
-	Path() string
-}, error) {
-
+func startProfiler(profilerType, dirPath string) (minioProfiler, error) {
 	var err error
 	if dirPath == "" {
 		dirPath, err = ioutil.TempDir("", "profile")
@@ -277,14 +273,17 @@ func startProfiler(profilerType, dirPath string) (interface {
 	}, nil
 }
 
-// Global profiler to be used by service go-routine.
-var globalProfiler interface {
+// minioProfiler - minio profiler interface.
+type minioProfiler interface {
 	// Stop the profiler
 	Stop()
 	// Return the path of the profiling file
 	Path() string
 }
 
+// Global profiler to be used by service go-routine.
+var globalProfiler minioProfiler
+
 // dump the request into a string in JSON format.
 func dumpRequest(r *http.Request) string {
 	header := cloneHeader(r.Header)
@@ -307,7 +306,7 @@ func dumpRequest(r *http.Request) string {
 	}
 
 	// Formatted string.
-	return strings.TrimSpace(string(buffer.Bytes()))
+	return strings.TrimSpace(buffer.String())
 }
 
 // isFile - returns whether given path is a file or not.

cmd/web-handlers.go

@@ -913,7 +913,7 @@ func (web *webAPIHandlers) Upload(w http.ResponseWriter, r *http.Request) {
 		metadata[ReservedMetadataPrefix+"actual-size"] = strconv.FormatInt(size, 10)
 
 		pipeReader, pipeWriter := io.Pipe()
-		snappyWriter := snappy.NewWriter(pipeWriter)
+		snappyWriter := snappy.NewBufferedWriter(pipeWriter)
 
 		var actualReader *hash.Reader
 		actualReader, err = hash.NewReader(reader, size, "", "", actualSize)
@@ -1313,14 +1313,15 @@ func (web *webAPIHandlers) DownloadZip(w http.ResponseWriter, r *http.Request) {
 				// Response writer should be limited early on for decryption upto required length,
 				// additionally also skipping mod(offset)64KiB boundaries.
 				writer = ioutil.LimitedWriter(writer, startOffset%(64*1024), length)
-				writer, startOffset, length, err = DecryptBlocksRequest(writer, r, args.BucketName, objectName, startOffset, length, info, false)
+				writer, startOffset, length, err = DecryptBlocksRequest(writer, r,
+					args.BucketName, objectName, startOffset, length, info, false)
 				if err != nil {
 					writeWebErrorResponse(w, err)
 					return err
 				}
 			}
 			httpWriter := ioutil.WriteOnClose(writer)
-			if err = getObject(ctx, args.BucketName, objectName, 0, length, httpWriter, "", opts); err != nil {
+			if err = getObject(ctx, args.BucketName, objectName, startOffset, length, httpWriter, "", opts); err != nil {
 				httpWriter.Close()
 				if info.IsCompressed() {
 					// Wait for decompression go-routine to retire.

cmd/web-handlers_test.go

@@ -120,7 +120,7 @@ func TestWriteWebErrorResponse(t *testing.T) {
 		recvDesc := buffer.Bytes()
 		// Check if the written desc is same as the one expected.
 		if !bytes.Equal(recvDesc, []byte(desc)) {
-			t.Errorf("Test %d: Unexpected response, expecting %s, got %s", i+1, desc, string(buffer.Bytes()))
+			t.Errorf("Test %d: Unexpected response, expecting %s, got %s", i+1, desc, buffer.String())
 		}
 		buffer.Reset()
 	}
@@ -491,23 +491,23 @@ func testListObjectsWebHandler(obj ObjectLayer, instanceType string, t TestErrHa
 		t.Fatalf("Was not able to upload an object, %v", err)
 	}
 
-	test := func(token string) (error, *ListObjectsRep) {
+	test := func(token string) (*ListObjectsRep, error) {
 		listObjectsRequest := ListObjectsArgs{BucketName: bucketName, Prefix: ""}
 		listObjectsReply := &ListObjectsRep{}
 		var req *http.Request
 		req, err = newTestWebRPCRequest("Web.ListObjects", token, listObjectsRequest)
 		if err != nil {
-			t.Fatalf("Failed to create HTTP request: <ERROR> %v", err)
+			return nil, err
 		}
 		apiRouter.ServeHTTP(rec, req)
 		if rec.Code != http.StatusOK {
-			return fmt.Errorf("Expected the response status to be 200, but instead found `%d`", rec.Code), listObjectsReply
+			return listObjectsReply, fmt.Errorf("Expected the response status to be 200, but instead found `%d`", rec.Code)
 		}
 		err = getTestWebRPCResponse(rec, &listObjectsReply)
 		if err != nil {
-			return err, listObjectsReply
+			return listObjectsReply, err
 		}
-		return nil, listObjectsReply
+		return listObjectsReply, nil
 	}
 	verifyReply := func(reply *ListObjectsRep) {
 		if len(reply.Objects) == 0 {
@@ -522,14 +522,14 @@ func testListObjectsWebHandler(obj ObjectLayer, instanceType string, t TestErrHa
 	}
 
 	// Authenticated ListObjects should succeed.
-	err, reply := test(authorization)
+	reply, err := test(authorization)
 	if err != nil {
 		t.Fatal(err)
 	}
 	verifyReply(reply)
 
 	// Unauthenticated ListObjects should fail.
-	err, _ = test("")
+	_, err = test("")
 	if err == nil {
 		t.Fatalf("Expected error `%s`", err)
 	}
@@ -552,7 +552,7 @@ func testListObjectsWebHandler(obj ObjectLayer, instanceType string, t TestErrHa
 	defer globalPolicySys.Remove(bucketName)
 
 	// Unauthenticated ListObjects with READ bucket policy should succeed.
-	err, reply = test("")
+	reply, err = test("")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -1559,7 +1559,7 @@ func TestWebCheckAuthorization(t *testing.T) {
 	if rec.Code != http.StatusForbidden {
 		t.Fatalf("Expected the response status to be 403, but instead found `%d`", rec.Code)
 	}
-	resp := string(rec.Body.Bytes())
+	resp := rec.Body.String()
 	if !strings.EqualFold(resp, errAuthentication.Error()) {
 		t.Fatalf("Unexpected error message, expected: %s, found: `%s`", errAuthentication, resp)
 	}
@@ -1580,7 +1580,7 @@ func TestWebCheckAuthorization(t *testing.T) {
 	if rec.Code != http.StatusForbidden {
 		t.Fatalf("Expected the response status to be 403, but instead found `%d`", rec.Code)
 	}
-	resp = string(rec.Body.Bytes())
+	resp = rec.Body.String()
 	if !strings.EqualFold(resp, errAuthentication.Error()) {
 		t.Fatalf("Unexpected error message, expected: `%s`, found: `%s`", errAuthentication, resp)
 	}

cmd/xl-sets.go

@@ -1111,16 +1111,8 @@ func (s *xlSets) HealFormat(ctx context.Context, dryRun bool) (res madmin.HealRe
 	res.Before.Drives = make([]madmin.HealDriveInfo, len(beforeDrives))
 	// Copy "after" drive state too from before.
 	for k, v := range beforeDrives {
-		res.Before.Drives[k] = madmin.HealDriveInfo{
-			UUID:     v.UUID,
-			Endpoint: v.Endpoint,
-			State:    v.State,
-		}
-		res.After.Drives[k] = madmin.HealDriveInfo{
-			UUID:     v.UUID,
-			Endpoint: v.Endpoint,
-			State:    v.State,
-		}
+		res.Before.Drives[k] = madmin.HealDriveInfo(v)
+		res.After.Drives[k] = madmin.HealDriveInfo(v)
 	}
 
 	for index, sErr := range sErrs {
@@ -1253,12 +1245,8 @@ func (s *xlSets) HealBucket(ctx context.Context, bucket string, dryRun, remove b
 		if err != nil {
 			return result, err
 		}
-		for _, v := range healResult.Before.Drives {
-			result.Before.Drives = append(result.Before.Drives, v)
-		}
-		for _, v := range healResult.After.Drives {
-			result.After.Drives = append(result.After.Drives, v)
-		}
+		result.Before.Drives = append(result.Before.Drives, healResult.Before.Drives...)
+		result.After.Drives = append(result.After.Drives, healResult.After.Drives...)
 	}
 
 	for _, endpoint := range s.endpoints {
@@ -1326,10 +1314,7 @@ func (s *xlSets) ListBucketsHeal(ctx context.Context) ([]BucketInfo, error) {
 			return nil, err
 		}
 		for _, currBucket := range buckets {
-			healBuckets[currBucket.Name] = BucketInfo{
-				Name:    currBucket.Name,
-				Created: currBucket.Created,
-			}
+			healBuckets[currBucket.Name] = BucketInfo(currBucket)
 		}
 	}
 	for _, bucketInfo := range healBuckets {

cmd/xl-v1-bucket.go

@@ -130,11 +130,7 @@ func (xl xlObjects) getBucketInfo(ctx context.Context, bucketName string) (bucke
 		}
 		volInfo, serr := disk.StatVol(bucketName)
 		if serr == nil {
-			bucketInfo = BucketInfo{
-				Name:    volInfo.Name,
-				Created: volInfo.Created,
-			}
-			return bucketInfo, nil
+			return BucketInfo(volInfo), nil
 		}
 		err = serr
 		// For any reason disk went offline continue and pick the next one.
@@ -185,10 +181,7 @@ func (xl xlObjects) listBuckets(ctx context.Context) (bucketsInfo []BucketInfo,
 				if isReservedOrInvalidBucket(volInfo.Name) {
 					continue
 				}
-				bucketsInfo = append(bucketsInfo, BucketInfo{
-					Name:    volInfo.Name,
-					Created: volInfo.Created,
-				})
+				bucketsInfo = append(bucketsInfo, BucketInfo(volInfo))
 			}
 			// For buckets info empty, loop once again to check
 			// if we have, can happen if disks were down.

cmd/xl-v1-healing-common_test.go

@@ -278,7 +278,7 @@ func TestDisksWithAllParts(t *testing.T) {
 		t.Fatalf("Failed to putObject %v", err)
 	}
 
-	partsMetadata, errs := readAllXLMetadata(ctx, xlDisks, bucket, object)
+	_, errs := readAllXLMetadata(ctx, xlDisks, bucket, object)
 	readQuorum := len(xl.storageDisks) / 2
 	if reducedErr := reduceReadQuorumErrs(ctx, errs, objectOpIgnoredErrs, readQuorum); reducedErr != nil {
 		t.Fatalf("Failed to read xl meta data %v", reducedErr)
@@ -286,7 +286,7 @@ func TestDisksWithAllParts(t *testing.T) {
 
 	// Test that all disks are returned without any failures with
 	// unmodified meta data
-	partsMetadata, errs = readAllXLMetadata(ctx, xlDisks, bucket, object)
+	partsMetadata, errs := readAllXLMetadata(ctx, xlDisks, bucket, object)
 	if err != nil {
 		t.Fatalf("Failed to read xl meta data %v", err)
 	}

cmd/xl-v1.go

@@ -120,28 +120,18 @@ func getStorageInfo(disks []StorageAPI) StorageInfo {
 		return StorageInfo{}
 	}
 
-	_, sscParity := getRedundancyCount(standardStorageClass, len(disks))
-	_, rrscparity := getRedundancyCount(reducedRedundancyStorageClass, len(disks))
-
-	// Total number of online data drives available
-	// This is the number of drives we report free and total space for
-	availableDataDisks := uint64(onlineDisks - sscParity)
-
-	// Available data disks can be zero when onlineDisks is equal to parity,
-	// at that point we simply choose online disks to calculate the size.
-	if availableDataDisks == 0 {
-		availableDataDisks = uint64(onlineDisks)
-	}
-
-	storageInfo := StorageInfo{}
-
 	// Combine all disks to get total usage.
 	var used uint64
 	for _, di := range validDisksInfo {
 		used = used + di.Used
 	}
-	storageInfo.Used = used
 
+	_, sscParity := getRedundancyCount(standardStorageClass, len(disks))
+	_, rrscparity := getRedundancyCount(reducedRedundancyStorageClass, len(disks))
+
+	storageInfo := StorageInfo{
+		Used: used,
+	}
 	storageInfo.Backend.Type = BackendErasure
 	storageInfo.Backend.OnlineDisks = onlineDisks
 	storageInfo.Backend.OfflineDisks = offlineDisks

pkg/certs/certs_test.go

@@ -60,7 +60,7 @@ func TestCertNew(t *testing.T) {
 	if !reflect.DeepEqual(gcert.Certificate, expectedCert.Certificate) {
 		t.Error("certificate doesn't match expected certificate")
 	}
-	c, err = certs.New("server.crt", "server2.key", tls.LoadX509KeyPair)
+	_, err = certs.New("server.crt", "server2.key", tls.LoadX509KeyPair)
 	if err == nil {
 		t.Fatal("Expected to fail but got success")
 	}

pkg/disk/disk_test.go

@@ -38,18 +38,6 @@ func TestFree(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	if di.Total <= 0 {
-		t.Error("Unexpected Total", di.Total)
-	}
-	if di.Free <= 0 {
-		t.Error("Unexpected Free", di.Free)
-	}
-	if di.Files <= 0 {
-		t.Error("Unexpected Files", di.Files)
-	}
-	if di.Ffree <= 0 {
-		t.Error("Unexpected Ffree", di.Ffree)
-	}
 	if di.FSType == "UNKNOWN" {
 		t.Error("Unexpected FSType", di.FSType)
 	}

pkg/ellipses/ellipses.go

@@ -38,10 +38,10 @@ var (
 // `{1...64}`
 // `{33...64}`
 func parseEllipsesRange(pattern string) (seq []string, err error) {
-	if strings.Index(pattern, openBraces) == -1 {
+	if !strings.Contains(pattern, openBraces) {
 		return nil, errors.New("Invalid argument")
 	}
-	if strings.Index(pattern, closeBraces) == -1 {
+	if !strings.Contains(pattern, closeBraces) {
 		return nil, errors.New("Invalid argument")
 	}
 
@@ -145,7 +145,7 @@ func (p Pattern) Expand() []string {
 		case p.Suffix != "" && p.Prefix == "":
 			labels = append(labels, fmt.Sprintf("%s%s", p.Seq[i], p.Suffix))
 		case p.Suffix == "" && p.Prefix == "":
-			labels = append(labels, fmt.Sprintf("%s", p.Seq[i]))
+			labels = append(labels, p.Seq[i])
 		default:
 			labels = append(labels, fmt.Sprintf("%s%s%s", p.Prefix, p.Seq[i], p.Suffix))
 		}

pkg/event/config.go

@@ -191,13 +191,11 @@ func (q Queue) ToRulesMap() RulesMap {
 
 // Unused.  Available for completion.
 type lambda struct {
-	common
 	ARN string `xml:"CloudFunction"`
 }
 
 // Unused. Available for completion.
 type topic struct {
-	common
 	ARN string `xml:"Topic" json:"Topic"`
 }
 

pkg/event/config_test.go

@@ -199,8 +199,7 @@ func TestQueueUnmarshalXML(t *testing.T) {
 }
 
 func TestQueueValidate(t *testing.T) {
-	var data []byte
-	data = []byte(`
+	data := []byte(`
 <QueueConfiguration>
    <Id>1</Id>
    <Filter></Filter>
@@ -281,8 +280,7 @@ func TestQueueValidate(t *testing.T) {
 }
 
 func TestQueueSetRegion(t *testing.T) {
-	var data []byte
-	data = []byte(`
+	data := []byte(`
 <QueueConfiguration>
    <Id>1</Id>
    <Filter></Filter>
@@ -341,8 +339,7 @@ func TestQueueSetRegion(t *testing.T) {
 }
 
 func TestQueueToRulesMap(t *testing.T) {
-	var data []byte
-	data = []byte(`
+	data := []byte(`
 <QueueConfiguration>
    <Id>1</Id>
    <Filter></Filter>
@@ -520,8 +517,7 @@ func TestConfigUnmarshalXML(t *testing.T) {
 }
 
 func TestConfigValidate(t *testing.T) {
-	var data []byte
-	data = []byte(`
+	data := []byte(`
 <NotificationConfiguration>
    <QueueConfiguration>
       <Id>1</Id>
@@ -628,8 +624,7 @@ func TestConfigValidate(t *testing.T) {
 }
 
 func TestConfigSetRegion(t *testing.T) {
-	var data []byte
-	data = []byte(`
+	data := []byte(`
 <NotificationConfiguration>
    <QueueConfiguration>
       <Id>1</Id>
@@ -733,8 +728,7 @@ func TestConfigSetRegion(t *testing.T) {
 }
 
 func TestConfigToRulesMap(t *testing.T) {
-	var data []byte
-	data = []byte(`
+	data := []byte(`
 <NotificationConfiguration>
    <QueueConfiguration>
       <Id>1</Id>

pkg/handlers/http-tracer_test.go

@@ -142,13 +142,13 @@ Test-Header: TestHeaderValue
 				status, testCase.expectedStatus)
 		}
 
-		matched, err := regexp.MatchString(testCase.expectedLogRegexp, string(logOutput.Bytes()))
+		matched, err := regexp.MatchString(testCase.expectedLogRegexp, logOutput.String())
 		if err != nil {
 			t.Fatalf("Test %d: Incorrect regexp: %v", i+1, err)
 		}
 
 		if !matched {
-			t.Fatalf("Test %d: Unexpected log content, found: `%s`", i+1, string(logOutput.Bytes()))
+			t.Fatalf("Test %d: Unexpected log content, found: `%s`", i+1, logOutput.String())
 		}
 	}
 }

pkg/hash/reader_test.go

@@ -60,6 +60,9 @@ func TestHashReaderHelperMethods(t *testing.T) {
 		t.Errorf("Expected md5hex \"e2fc714c4727ee9395f324cd2e7f331f\", got %s", hex.EncodeToString(r.MD5Current()))
 	}
 	expectedSHA256, err := hex.DecodeString("88d4266fd4e6338d13b845fcf289579d209c897823b9217da3e161936f031589")
+	if err != nil {
+		t.Fatal(err)
+	}
 	if !bytes.Equal(r.SHA256(), expectedSHA256) {
 		t.Errorf("Expected md5hex \"88d4266fd4e6338d13b845fcf289579d209c897823b9217da3e161936f031589\", got %s", r.SHA256HexString())
 	}

pkg/madmin/api.go

@@ -22,7 +22,6 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
-	"math/rand"
 	"net/http"
 	"net/http/httputil"
 	"net/url"
@@ -61,9 +60,6 @@ type AdminClient struct {
 	// Advanced functionality.
 	isTraceEnabled bool
 	traceOutput    io.Writer
-
-	// Random seed.
-	random *rand.Rand
 }
 
 // Global constants.
@@ -118,21 +114,17 @@ func privateNew(endpoint, accessKeyID, secretAccessKey string, secure bool) (*Ad
 }
 
 // SetAppInfo - add application details to user agent.
-func (c *AdminClient) SetAppInfo(appName string, appVersion string) {
+func (adm *AdminClient) SetAppInfo(appName string, appVersion string) {
 	// if app name and version is not set, we do not a new user
 	// agent.
 	if appName != "" && appVersion != "" {
-		c.appInfo = struct {
-			appName    string
-			appVersion string
-		}{}
-		c.appInfo.appName = appName
-		c.appInfo.appVersion = appVersion
+		adm.appInfo.appName = appName
+		adm.appInfo.appVersion = appVersion
 	}
 }
 
 // SetCustomTransport - set new custom transport.
-func (c *AdminClient) SetCustomTransport(customHTTPTransport http.RoundTripper) {
+func (adm *AdminClient) SetCustomTransport(customHTTPTransport http.RoundTripper) {
 	// Set this to override default transport
 	// ``http.DefaultTransport``.
 	//
@@ -147,28 +139,28 @@ func (c *AdminClient) SetCustomTransport(customHTTPTransport http.RoundTripper)
 	//   }
 	//   api.SetTransport(tr)
 	//
-	if c.httpClient != nil {
-		c.httpClient.Transport = customHTTPTransport
+	if adm.httpClient != nil {
+		adm.httpClient.Transport = customHTTPTransport
 	}
 }
 
 // TraceOn - enable HTTP tracing.
-func (c *AdminClient) TraceOn(outputStream io.Writer) {
+func (adm *AdminClient) TraceOn(outputStream io.Writer) {
 	// if outputStream is nil then default to os.Stdout.
 	if outputStream == nil {
 		outputStream = os.Stdout
 	}
 	// Sets a new output stream.
-	c.traceOutput = outputStream
+	adm.traceOutput = outputStream
 
 	// Enable tracing.
-	c.isTraceEnabled = true
+	adm.isTraceEnabled = true
 }
 
 // TraceOff - disable HTTP tracing.
-func (c *AdminClient) TraceOff() {
+func (adm *AdminClient) TraceOff() {
 	// Disable tracing.
-	c.isTraceEnabled = false
+	adm.isTraceEnabled = false
 }
 
 // requestMetadata - is container for all the values to make a
@@ -181,7 +173,7 @@ type requestData struct {
 }
 
 // Filter out signature value from Authorization header.
-func (c AdminClient) filterSignature(req *http.Request) {
+func (adm AdminClient) filterSignature(req *http.Request) {
 	/// Signature V4 authorization header.
 
 	// Save the original auth.
@@ -197,19 +189,18 @@ func (c AdminClient) filterSignature(req *http.Request) {
 
 	// Set a temporary redacted auth
 	req.Header.Set("Authorization", newAuth)
-	return
 }
 
 // dumpHTTP - dump HTTP request and response.
-func (c AdminClient) dumpHTTP(req *http.Request, resp *http.Response) error {
+func (adm AdminClient) dumpHTTP(req *http.Request, resp *http.Response) error {
 	// Starts http dump.
-	_, err := fmt.Fprintln(c.traceOutput, "---------START-HTTP---------")
+	_, err := fmt.Fprintln(adm.traceOutput, "---------START-HTTP---------")
 	if err != nil {
 		return err
 	}
 
 	// Filter out Signature field from Authorization header.
-	c.filterSignature(req)
+	adm.filterSignature(req)
 
 	// Only display request header.
 	reqTrace, err := httputil.DumpRequestOut(req, false)
@@ -218,7 +209,7 @@ func (c AdminClient) dumpHTTP(req *http.Request, resp *http.Response) error {
 	}
 
 	// Write request to trace output.
-	_, err = fmt.Fprint(c.traceOutput, string(reqTrace))
+	_, err = fmt.Fprint(adm.traceOutput, string(reqTrace))
 	if err != nil {
 		return err
 	}
@@ -254,24 +245,24 @@ func (c AdminClient) dumpHTTP(req *http.Request, resp *http.Response) error {
 		}
 	}
 	// Write response to trace output.
-	_, err = fmt.Fprint(c.traceOutput, strings.TrimSuffix(string(respTrace), "\r\n"))
+	_, err = fmt.Fprint(adm.traceOutput, strings.TrimSuffix(string(respTrace), "\r\n"))
 	if err != nil {
 		return err
 	}
 
 	// Ends the http dump.
-	_, err = fmt.Fprintln(c.traceOutput, "---------END-HTTP---------")
+	_, err = fmt.Fprintln(adm.traceOutput, "---------END-HTTP---------")
 	return err
 }
 
 // do - execute http request.
-func (c AdminClient) do(req *http.Request) (*http.Response, error) {
+func (adm AdminClient) do(req *http.Request) (*http.Response, error) {
 	var resp *http.Response
 	var err error
 	// Do the request in a loop in case of 307 http is met since golang still doesn't
 	// handle properly this situation (https://github.com/golang/go/issues/7912)
 	for {
-		resp, err = c.httpClient.Do(req)
+		resp, err = adm.httpClient.Do(req)
 		if err != nil {
 			// Handle this specifically for now until future Golang
 			// versions fix this issue properly.
@@ -304,8 +295,8 @@ func (c AdminClient) do(req *http.Request) (*http.Response, error) {
 	}
 
 	// If trace is enabled, dump http request and response.
-	if c.isTraceEnabled {
-		err = c.dumpHTTP(req, resp)
+	if adm.isTraceEnabled {
+		err = adm.dumpHTTP(req, resp)
 		if err != nil {
 			return nil, err
 		}
@@ -323,7 +314,7 @@ var successStatus = []int{
 // executeMethod - instantiates a given method, and retries the
 // request upon any error up to maxRetries attempts in a binomially
 // delayed manner using a standard back off algorithm.
-func (c AdminClient) executeMethod(method string, reqData requestData) (res *http.Response, err error) {
+func (adm AdminClient) executeMethod(method string, reqData requestData) (res *http.Response, err error) {
 
 	// Create a done channel to control 'ListObjects' go routine.
 	doneCh := make(chan struct{}, 1)
@@ -333,13 +324,13 @@ func (c AdminClient) executeMethod(method string, reqData requestData) (res *htt
 
 	// Instantiate a new request.
 	var req *http.Request
-	req, err = c.newRequest(method, reqData)
+	req, err = adm.newRequest(method, reqData)
 	if err != nil {
 		return nil, err
 	}
 
 	// Initiate the request.
-	res, err = c.do(req)
+	res, err = adm.do(req)
 	if err != nil {
 		return nil, err
 	}
@@ -368,15 +359,15 @@ func (c AdminClient) executeMethod(method string, reqData requestData) (res *htt
 }
 
 // set User agent.
-func (c AdminClient) setUserAgent(req *http.Request) {
+func (adm AdminClient) setUserAgent(req *http.Request) {
 	req.Header.Set("User-Agent", libraryUserAgent)
-	if c.appInfo.appName != "" && c.appInfo.appVersion != "" {
-		req.Header.Set("User-Agent", libraryUserAgent+" "+c.appInfo.appName+"/"+c.appInfo.appVersion)
+	if adm.appInfo.appName != "" && adm.appInfo.appVersion != "" {
+		req.Header.Set("User-Agent", libraryUserAgent+" "+adm.appInfo.appName+"/"+adm.appInfo.appVersion)
 	}
 }
 
 // newRequest - instantiate a new HTTP request for a given method.
-func (c AdminClient) newRequest(method string, reqData requestData) (req *http.Request, err error) {
+func (adm AdminClient) newRequest(method string, reqData requestData) (req *http.Request, err error) {
 	// If no method is supplied default to 'POST'.
 	if method == "" {
 		method = "POST"
@@ -386,7 +377,7 @@ func (c AdminClient) newRequest(method string, reqData requestData) (req *http.R
 	location := ""
 
 	// Construct a new target URL.
-	targetURL, err := c.makeTargetURL(reqData)
+	targetURL, err := adm.makeTargetURL(reqData)
 	if err != nil {
 		return nil, err
 	}
@@ -397,7 +388,7 @@ func (c AdminClient) newRequest(method string, reqData requestData) (req *http.R
 		return nil, err
 	}
 
-	c.setUserAgent(req)
+	adm.setUserAgent(req)
 	for k, v := range reqData.customHeaders {
 		req.Header.Set(k, v[0])
 	}
@@ -407,15 +398,15 @@ func (c AdminClient) newRequest(method string, reqData requestData) (req *http.R
 	req.Header.Set("X-Amz-Content-Sha256", hex.EncodeToString(sum256(reqData.content)))
 	req.Body = ioutil.NopCloser(bytes.NewReader(reqData.content))
 
-	req = s3signer.SignV4(*req, c.accessKeyID, c.secretAccessKey, "", location)
+	req = s3signer.SignV4(*req, adm.accessKeyID, adm.secretAccessKey, "", location)
 	return req, nil
 }
 
 // makeTargetURL make a new target url.
-func (c AdminClient) makeTargetURL(r requestData) (*url.URL, error) {
+func (adm AdminClient) makeTargetURL(r requestData) (*url.URL, error) {
 
-	host := c.endpointURL.Host
-	scheme := c.endpointURL.Scheme
+	host := adm.endpointURL.Host
+	scheme := adm.endpointURL.Scheme
 
 	urlStr := scheme + "://" + host + libraryAdminURLPrefix + r.relPath
 

pkg/mimedb/db_test.go

@@ -31,9 +31,8 @@ func TestMimeLookup(t *testing.T) {
 }
 
 func TestTypeByExtension(t *testing.T) {
-	var contentType string
 	// Test TypeByExtension.
-	contentType = TypeByExtension(".txt")
+	contentType := TypeByExtension(".txt")
 	if contentType != "text/plain" {
 		t.Fatalf("Invalid content type are found expected \"text/plain\", got %s", contentType)
 	}

pkg/quick/errorutil.go

@@ -62,17 +62,16 @@ func FormatJSONSyntaxError(data io.Reader, offset int64) (highlight string) {
 		if readBytes > offset {
 			break
 		}
-		switch b {
-		case '\n':
+		if b == '\n' {
 			readLine.Reset()
 			errLine++
-		case '\t':
+			continue
+		} else if b == '\t' {
 			readLine.WriteByte(' ')
-		case '\r':
+		} else if b == '\r' {
 			break
-		default:
-			readLine.WriteByte(b)
 		}
+		readLine.WriteByte(b)
 	}
 
 	lineLen := readLine.Len()

pkg/s3select/message.go

@@ -307,7 +307,6 @@ func (writer *messageWriter) start() {
 		case <-recordStagingTicker.C:
 			if !writer.flushRecords() {
 				quitFlag = true
-				break
 			}
 
 		case <-keepAliveTicker.C:

pkg/s3select/select.go

@@ -408,9 +408,7 @@ func (s3Select *S3Select) Evaluate(w http.ResponseWriter) {
 	}
 
 	if err != nil {
-		if serr := writer.FinishWithError("InternalError", err.Error()); serr != nil {
-			// FIXME: log errors.
-		}
+		_ = writer.FinishWithError("InternalError", err.Error())
 	}
 }
 

pkg/s3select/sql/aggregation.go

@@ -274,10 +274,6 @@ func (e *FuncExpr) aggregateRow(r Record) error {
 // called after calling aggregateRow() on each input row, to calculate
 // the final aggregate result.
 
-func (e *Expression) getAggregate() (*Value, error) {
-	return e.evalNode(nil)
-}
-
 func (e *FuncExpr) getAggregate() (*Value, error) {
 	switch e.getFunctionName() {
 	case aggFnCount:

pkg/s3select/sql/funceval.go

@@ -234,7 +234,9 @@ func handleDateAdd(r Record, d *DateAddFunc) (*Value, error) {
 	if err != nil {
 		return nil, err
 	}
-	inferTypeAsTimestamp(ts)
+	if err = inferTypeAsTimestamp(ts); err != nil {
+		return nil, err
+	}
 	t, ok := ts.ToTimestamp()
 	if !ok {
 		return nil, fmt.Errorf("%s() expects a timestamp argument", sqlFnDateAdd)
@@ -248,7 +250,9 @@ func handleDateDiff(r Record, d *DateDiffFunc) (*Value, error) {
 	if err != nil {
 		return nil, err
 	}
-	inferTypeAsTimestamp(tval1)
+	if err = inferTypeAsTimestamp(tval1); err != nil {
+		return nil, err
+	}
 	ts1, ok := tval1.ToTimestamp()
 	if !ok {
 		return nil, fmt.Errorf("%s() expects two timestamp arguments", sqlFnDateDiff)
@@ -258,7 +262,9 @@ func handleDateDiff(r Record, d *DateDiffFunc) (*Value, error) {
 	if err != nil {
 		return nil, err
 	}
-	inferTypeAsTimestamp(tval2)
+	if err = inferTypeAsTimestamp(tval2); err != nil {
+		return nil, err
+	}
 	ts2, ok := tval2.ToTimestamp()
 	if !ok {
 		return nil, fmt.Errorf("%s() expects two timestamp arguments", sqlFnDateDiff)
@@ -363,7 +369,9 @@ func handleSQLExtract(r Record, e *ExtractFunc) (res *Value, err error) {
 		return nil, verr
 	}
 
-	inferTypeAsTimestamp(timeVal)
+	if err = inferTypeAsTimestamp(timeVal); err != nil {
+		return nil, err
+	}
 
 	t, ok := timeVal.ToTimestamp()
 	if !ok {

pkg/s3select/sql/parser.go

@@ -83,8 +83,6 @@ type Select struct {
 type SelectExpression struct {
 	All         bool                 `parser:"  @\"*\""`
 	Expressions []*AliasedExpression `parser:"| @@ { \",\" @@ }"`
-
-	prop qProp
 }
 
 // TableExpression represents the FROM clause

pkg/s3select/sql/timestampfuncs.go

@@ -38,7 +38,6 @@ var (
 		layoutSecond,
 		layoutNanosecond,
 	}
-	oneNanoSecond = 1
 )
 
 func parseSQLTimestamp(s string) (t time.Time, err error) {

pkg/s3select/sql/value.go

@@ -248,7 +248,7 @@ func (v *Value) CSVString() string {
 	case typeBool:
 		return fmt.Sprintf("%v", v.value.(bool))
 	case typeString:
-		return fmt.Sprintf("%s", v.value.(string))
+		return v.value.(string)
 	case typeInt:
 		return fmt.Sprintf("%v", v.value.(int64))
 	case typeFloat:
@@ -610,22 +610,22 @@ func (v *Value) minmax(a *Value, isMax, isFirstRow bool) error {
 	return nil
 }
 
-func inferTypeAsTimestamp(v *Value) {
+func inferTypeAsTimestamp(v *Value) error {
 	if s, ok := v.ToString(); ok {
 		t, err := parseSQLTimestamp(s)
 		if err != nil {
-			return
+			return err
 		}
 		v.setTimestamp(t)
 	} else if b, ok := v.ToBytes(); ok {
 		s := string(b)
 		t, err := parseSQLTimestamp(s)
 		if err != nil {
-			return
+			return err
 		}
 		v.setTimestamp(t)
 	}
-	return
+	return nil
 }
 
 // inferTypeAsString is used to convert untyped values to string - it

pkg/trie/trie_test.go

@@ -22,8 +22,7 @@ import (
 
 // Simply make sure creating a new tree works.
 func TestNewTrie(t *testing.T) {
-	var trie *Trie
-	trie = NewTrie()
+	trie := NewTrie()
 
 	if trie.size != 0 {
 		t.Errorf("expected size 0, got: %d", trie.size)
@@ -32,8 +31,7 @@ func TestNewTrie(t *testing.T) {
 
 // Ensure that we can insert new keys into the tree, then check the size.
 func TestInsert(t *testing.T) {
-	var trie *Trie
-	trie = NewTrie()
+	trie := NewTrie()
 
 	// We need to have an empty tree to begin with.
 	if trie.size != 0 {
@@ -51,8 +49,7 @@ func TestInsert(t *testing.T) {
 
 // Ensure that PrefixMatch gives us the correct two keys in the tree.
 func TestPrefixMatch(t *testing.T) {
-	var trie *Trie
-	trie = NewTrie()
+	trie := NewTrie()
 
 	// Feed it some fodder: only 'minio' and 'miny-os' should trip the matcher.
 	trie.Insert("minio")

pkg/words/damerau-levenshtein_test.go

@@ -26,7 +26,6 @@ func TestMinimum(t *testing.T) {
 	type testCase struct {
 		listval  []int
 		expected int
-		pass     bool
 	}
 	testCases := []testCase{
 		{listval: []int{3, 4, 15}, expected: 3},

staticcheck.conf

@@ -0,0 +1 @@
+checks = ["all", "-ST1005", "-ST1000", "-SA4000", "-SA9004", "-SA1019"]