Chore: Disable default golangci-lint filter (#29751)

* Disable default golangci-lint filter

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

* Chore: Fix linter warnings

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

pkg/api/api.go

@@ -1,3 +1,4 @@
+// Package api contains API logic.
 package api
 
 import (
@@ -7,10 +8,13 @@ import (
 	"github.com/grafana/grafana/pkg/api/avatar"
 	"github.com/grafana/grafana/pkg/api/dtos"
 	"github.com/grafana/grafana/pkg/api/routing"
+	"github.com/grafana/grafana/pkg/infra/log"
 	"github.com/grafana/grafana/pkg/middleware"
 	"github.com/grafana/grafana/pkg/models"
 )
 
+var plog = log.New("api")
+
 // registerRoutes registers all API HTTP routes.
 func (hs *HTTPServer) registerRoutes() {
 	reqSignedIn := middleware.ReqSignedIn

pkg/api/avatar/avatar.go

@@ -136,7 +136,9 @@ func newNotFound() *Avatar {
 	// variable.
 	// nolint:gosec
 	path := filepath.Join(setting.StaticRootPath, "img", "user_profile.png")
-
+	// It's safe to ignore gosec warning G304 since the variable part of the file path comes from a configuration
+	// variable.
+	// nolint:gosec
 	if data, err := ioutil.ReadFile(path); err != nil {
 		log.Errorf(3, "Failed to read user_profile.png, %v", path)
 	} else {
@@ -212,7 +214,10 @@ func (a *thunderTask) fetch() error {
 	a.Avatar.timestamp = time.Now()
 
 	log.Debugf("avatar.fetch(fetch new avatar): %s", a.Url)
-	req, _ := http.NewRequest("GET", a.Url, nil)
+	req, err := http.NewRequest("GET", a.Url, nil)
+	if err != nil {
+		return err
+	}
 	req.Header.Set("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/jpeg,image/png,*/*;q=0.8")
 	req.Header.Set("Accept-Encoding", "deflate,sdch")
 	req.Header.Set("Accept-Language", "zh-CN,zh;q=0.8")
@@ -221,10 +226,13 @@ func (a *thunderTask) fetch() error {
 	resp, err := client.Do(req)
 	if err != nil {
 		a.Avatar.notFound = true
-		return fmt.Errorf("gravatar unreachable, %v", err)
+		return fmt.Errorf("gravatar unreachable: %w", err)
 	}
-
-	defer resp.Body.Close()
+	defer func() {
+		if err := resp.Body.Close(); err != nil {
+			log.Warn("Failed to close response body", "err", err)
+		}
+	}()
 
 	if resp.StatusCode != 200 {
 		a.Avatar.notFound = true

pkg/api/dashboard_snapshot.go

@@ -54,7 +54,11 @@ func createExternalDashboardSnapshot(cmd models.CreateDashboardSnapshotCommand)
 	if err != nil {
 		return nil, err
 	}
-	defer response.Body.Close()
+	defer func() {
+		if err := response.Body.Close(); err != nil {
+			plog.Warn("Failed to close response body", "err", err)
+		}
+	}()
 
 	if response.StatusCode != 200 {
 		return nil, fmt.Errorf("create external snapshot response status code %d", response.StatusCode)
@@ -178,7 +182,9 @@ func deleteExternalDashboardSnapshot(externalUrl string) error {
 	if err != nil {
 		return err
 	}
-	defer response.Body.Close()
+	if err := response.Body.Close(); err != nil {
+		plog.Warn("Failed closing response body", "err", err)
+	}
 
 	if response.StatusCode == 200 {
 		return nil

pkg/api/ldap_debug.go

@@ -19,7 +19,7 @@ var (
 	getLDAPConfig = multildap.GetConfig
 	newLDAP       = multildap.New
 
-	logger = log.New("LDAP.debug")
+	ldapLogger = log.New("LDAP.debug")
 
 	errOrganizationNotFound = func(orgId int64) error {
 		return fmt.Errorf("unable to find organization with ID '%d'", orgId)
@@ -117,7 +117,6 @@ func (hs *HTTPServer) GetLDAPStatus(c *models.ReqContext) Response {
 	}
 
 	ldapConfig, err := getLDAPConfig(hs.Cfg)
-
 	if err != nil {
 		return Error(http.StatusBadRequest, "Failed to obtain the LDAP configuration. Please verify the configuration and try again", err)
 	}
@@ -129,7 +128,6 @@ func (hs *HTTPServer) GetLDAPStatus(c *models.ReqContext) Response {
 	}
 
 	statuses, err := ldap.Ping()
-
 	if err != nil {
 		return Error(http.StatusBadRequest, "Failed to connect to the LDAP server(s)", err)
 	}
@@ -187,12 +185,11 @@ func (hs *HTTPServer) PostSyncUserWithLDAP(c *models.ReqContext) Response {
 
 	ldapServer := newLDAP(ldapConfig.Servers)
 	user, _, err := ldapServer.User(query.Result.Login)
-
 	if err != nil {
 		if errors.Is(err, multildap.ErrDidNotFindUser) { // User was not in the LDAP server - we need to take action:
 			if setting.AdminUser == query.Result.Login { // User is *the* Grafana Admin. We cannot disable it.
 				errMsg := fmt.Sprintf(`Refusing to sync grafana super admin "%s" - it would be disabled`, query.Result.Login)
-				logger.Error(errMsg)
+				ldapLogger.Error(errMsg)
 				return Error(http.StatusBadRequest, errMsg, err)
 			}
 
@@ -210,7 +207,7 @@ func (hs *HTTPServer) PostSyncUserWithLDAP(c *models.ReqContext) Response {
 			return Error(http.StatusBadRequest, "User not found in LDAP. Disabled the user without updating information", nil) // should this be a success?
 		}
 
-		logger.Debug("Failed to sync the user with LDAP", "err", err)
+		ldapLogger.Debug("Failed to sync the user with LDAP", "err", err)
 		return Error(http.StatusBadRequest, "Something went wrong while finding the user in LDAP", err)
 	}
 
@@ -221,7 +218,6 @@ func (hs *HTTPServer) PostSyncUserWithLDAP(c *models.ReqContext) Response {
 	}
 
 	err = bus.Dispatch(upsertCmd)
-
 	if err != nil {
 		return Error(http.StatusInternalServerError, "Failed to update the user", err)
 	}
@@ -236,7 +232,6 @@ func (hs *HTTPServer) GetUserFromLDAP(c *models.ReqContext) Response {
 	}
 
 	ldapConfig, err := getLDAPConfig(hs.Cfg)
-
 	if err != nil {
 		return Error(http.StatusBadRequest, "Failed to obtain the LDAP configuration", err)
 	}
@@ -255,7 +250,7 @@ func (hs *HTTPServer) GetUserFromLDAP(c *models.ReqContext) Response {
 		return Error(http.StatusNotFound, "No user was found in the LDAP server(s) with that username", err)
 	}
 
-	logger.Debug("user found", "user", user)
+	ldapLogger.Debug("user found", "user", user)
 
 	name, surname := splitName(user.Name)
 
@@ -304,16 +299,14 @@ func (hs *HTTPServer) GetUserFromLDAP(c *models.ReqContext) Response {
 
 	u.OrgRoles = orgRoles
 
-	logger.Debug("mapping org roles", "orgsRoles", u.OrgRoles)
+	ldapLogger.Debug("mapping org roles", "orgsRoles", u.OrgRoles)
 	err = u.FetchOrgs()
-
 	if err != nil {
 		return Error(http.StatusBadRequest, "An organization was not found - Please verify your LDAP configuration", err)
 	}
 
 	cmd := &models.GetTeamsForLDAPGroupCommand{Groups: user.Groups}
 	err = bus.Dispatch(cmd)
-
 	if err != nil && !errors.Is(err, bus.ErrHandlerNotFound) {
 		return Error(http.StatusBadRequest, "Unable to find the teams for this user", err)
 	}

pkg/api/login_oauth.go

@@ -224,11 +224,11 @@ func buildExternalUserInfo(token *oauth2.Token, userInfo *social.BasicUserInfo,
 			var orgID int64
 			if setting.AutoAssignOrg && setting.AutoAssignOrgId > 0 {
 				orgID = int64(setting.AutoAssignOrgId)
-				logger.Debug("The user has a role assignment and organization membership is auto-assigned",
+				plog.Debug("The user has a role assignment and organization membership is auto-assigned",
 					"role", userInfo.Role, "orgId", orgID)
 			} else {
 				orgID = int64(1)
-				logger.Debug("The user has a role assignment and organization membership is not auto-assigned",
+				plog.Debug("The user has a role assignment and organization membership is not auto-assigned",
 					"role", userInfo.Role, "orgId", orgID)
 			}
 			extUser.OrgRoles[orgID] = rt

pkg/api/pluginproxy/access_token_provider.go

@@ -113,7 +113,10 @@ func (provider *accessTokenProvider) getAccessToken(data templateData) (string,
 		params.Add(key, interpolatedParam)
 	}
 
-	getTokenReq, _ := http.NewRequest("POST", urlInterpolated, bytes.NewBufferString(params.Encode()))
+	getTokenReq, err := http.NewRequest("POST", urlInterpolated, bytes.NewBufferString(params.Encode()))
+	if err != nil {
+		return "", err
+	}
 	getTokenReq.Header.Set("Content-Type", "application/x-www-form-urlencoded")
 	getTokenReq.Header.Set("Content-Length", strconv.Itoa(len(params.Encode())))
 
@@ -122,7 +125,11 @@ func (provider *accessTokenProvider) getAccessToken(data templateData) (string,
 		return "", err
 	}
 
-	defer resp.Body.Close()
+	defer func() {
+		if err := resp.Body.Close(); err != nil {
+			logger.Warn("Failed to close response body", "err", err)
+		}
+	}()
 
 	var token jwtToken
 	if err := json.NewDecoder(resp.Body).Decode(&token); err != nil {

pkg/api/static/static.go

@@ -134,7 +134,11 @@ func staticHandler(ctx *macaron.Context, log *log.Logger, opt StaticOptions) boo
 	if err != nil {
 		return false
 	}
-	defer f.Close()
+	defer func() {
+		if err := f.Close(); err != nil {
+			log.Printf("Failed to close file: %s\n", err)
+		}
+	}()
 
 	fi, err := f.Stat()
 	if err != nil {
@@ -154,7 +158,11 @@ func staticHandler(ctx *macaron.Context, log *log.Logger, opt StaticOptions) boo
 		if err != nil {
 			return false // Discard error.
 		}
-		defer f.Close()
+		defer func() {
+			if err := f.Close(); err != nil {
+				log.Printf("Failed to close file: %s", err)
+			}
+		}()
 
 		fi, err = f.Stat()
 		if err != nil || fi.IsDir() {
@@ -163,7 +171,7 @@ func staticHandler(ctx *macaron.Context, log *log.Logger, opt StaticOptions) boo
 	}
 
 	if !opt.SkipLogging {
-		log.Println("[Static] Serving " + file)
+		log.Printf("[Static] Serving %s\n", file)
 	}
 
 	// Add an Expires header to the static content

pkg/cmd/grafana-cli/commands/install_command.go

@@ -111,11 +111,17 @@ func InstallPlugin(pluginName, version string, c utils.CommandLine, client utils
 	if err != nil {
 		return errutil.Wrap("failed to create temporary file", err)
 	}
-	defer os.Remove(tmpFile.Name())
+	defer func() {
+		if err := os.Remove(tmpFile.Name()); err != nil {
+			logger.Warn("Failed to remove temporary file", "file", tmpFile.Name(), "err", err)
+		}
+	}()
 
 	err = client.DownloadFile(pluginName, tmpFile, downloadURL, checksum)
 	if err != nil {
-		tmpFile.Close()
+		if err := tmpFile.Close(); err != nil {
+			logger.Warn("Failed to close file", "err", err)
+		}
 		return errutil.Wrap("failed to download plugin archive", err)
 	}
 	err = tmpFile.Close()
@@ -228,6 +234,8 @@ func extractFiles(archiveFile string, pluginName string, filePath string, allowS
 		newFile := filepath.Join(filePath, newFileName)
 
 		if zf.FileInfo().IsDir() {
+			// We can ignore gosec G304 here since it makes sense to give all users read access
+			// nolint:gosec
 			if err := os.MkdirAll(newFile, 0755); err != nil {
 				if os.IsPermission(err) {
 					return fmt.Errorf(permissionsDeniedMessage, newFile)
@@ -240,6 +248,8 @@ func extractFiles(archiveFile string, pluginName string, filePath string, allowS
 		}
 
 		// Create needed directories to extract file
+		// We can ignore gosec G304 here since it makes sense to give all users read access
+		// nolint:gosec
 		if err := os.MkdirAll(filepath.Dir(newFile), 0755); err != nil {
 			return errutil.Wrap("failed to create directory to extract plugin files", err)
 		}

pkg/cmd/grafana-cli/commands/install_command_test.go

@@ -215,7 +215,7 @@ func setupFakePluginsDir(t *testing.T) (string, func()) {
 	err := os.RemoveAll(dirname)
 	require.Nil(t, err)
 
-	err = os.MkdirAll(dirname, 0774)
+	err = os.MkdirAll(dirname, 0750)
 	require.Nil(t, err)
 
 	return dirname, func() {

pkg/cmd/grafana-cli/services/api_client.go

@@ -94,14 +94,20 @@ func (client *GrafanaComClient) DownloadFile(pluginName string, tmpFile *os.File
 	if err != nil {
 		return errutil.Wrap("Failed to send request", err)
 	}
-	defer bodyReader.Close()
+	defer func() {
+		if err := bodyReader.Close(); err != nil {
+			logger.Warn("Failed to close body", "err", err)
+		}
+	}()
 
 	w := bufio.NewWriter(tmpFile)
 	h := md5.New()
 	if _, err = io.Copy(w, io.TeeReader(bodyReader, h)); err != nil {
 		return errutil.Wrap("Failed to compute MD5 checksum", err)
 	}
-	w.Flush()
+	if err := w.Flush(); err != nil {
+		return fmt.Errorf("failed to write to %q: %w", tmpFile.Name(), err)
+	}
 	if len(checksum) > 0 && checksum != fmt.Sprintf("%x", h.Sum(nil)) {
 		return fmt.Errorf("expected MD5 checksum does not match the downloaded archive - please contact security@grafana.com")
 	}
@@ -131,7 +137,11 @@ func sendRequestGetBytes(client http.Client, repoUrl string, subPaths ...string)
 	if err != nil {
 		return []byte{}, err
 	}
-	defer bodyReader.Close()
+	defer func() {
+		if err := bodyReader.Close(); err != nil {
+			logger.Warn("Failed to close stream", "err", err)
+		}
+	}()
 	return ioutil.ReadAll(bodyReader)
 }
 
@@ -182,7 +192,11 @@ func handleResponse(res *http.Response) (io.ReadCloser, error) {
 
 	if res.StatusCode/100 == 4 {
 		body, err := ioutil.ReadAll(res.Body)
-		defer res.Body.Close()
+		defer func() {
+			if err := res.Body.Close(); err != nil {
+				logger.Warn("Failed to close response body", "err", err)
+			}
+		}()
 		if err != nil || len(body) == 0 {
 			return nil, &BadRequestError{Status: res.Status}
 		}

pkg/cmd/grafana-cli/services/api_client_test.go

@@ -14,8 +14,9 @@ import (
 
 func TestHandleResponse(t *testing.T) {
 	t.Run("Returns body if status == 200", func(t *testing.T) {
-		resp := makeResponse(200, "test")
-		defer resp.Body.Close()
+		// The body gets closed within makeResponse
+		// nolint:bodyclose
+		resp := makeResponse(t, 200, "test")
 		bodyReader, err := handleResponse(resp)
 		require.NoError(t, err)
 		body, err := ioutil.ReadAll(bodyReader)
@@ -24,54 +25,68 @@ func TestHandleResponse(t *testing.T) {
 	})
 
 	t.Run("Returns ErrorNotFound if status == 404", func(t *testing.T) {
-		resp := makeResponse(404, "")
-		defer resp.Body.Close()
+		// The body gets closed within makeResponse
+		// nolint:bodyclose
+		resp := makeResponse(t, 404, "")
 		_, err := handleResponse(resp)
 		assert.Equal(t, ErrNotFoundError, err)
 	})
 
 	t.Run("Returns message from body if status == 400", func(t *testing.T) {
-		resp := makeResponse(400, "{ \"message\": \"error_message\" }")
-		defer resp.Body.Close()
+		// The body gets closed within makeResponse
+		// nolint:bodyclose
+		resp := makeResponse(t, 400, "{ \"message\": \"error_message\" }")
 		_, err := handleResponse(resp)
 		require.Error(t, err)
 		assert.Equal(t, "error_message", asBadRequestError(t, err).Message)
 	})
 
 	t.Run("Returns body if status == 400 and no message key", func(t *testing.T) {
-		resp := makeResponse(400, "{ \"test\": \"test_message\"}")
-		defer resp.Body.Close()
+		// The body gets closed within makeResponse
+		// nolint:bodyclose
+		resp := makeResponse(t, 400, "{ \"test\": \"test_message\"}")
 		_, err := handleResponse(resp)
 		require.Error(t, err)
 		assert.Equal(t, "{ \"test\": \"test_message\"}", asBadRequestError(t, err).Message)
 	})
 
 	t.Run("Returns Bad request error if status == 400 and no body", func(t *testing.T) {
-		resp := makeResponse(400, "")
-		defer resp.Body.Close()
+		// The body gets closed within makeResponse
+		// nolint:bodyclose
+		resp := makeResponse(t, 400, "")
 		_, err := handleResponse(resp)
 		require.Error(t, err)
 		_ = asBadRequestError(t, err)
 	})
 
 	t.Run("Returns error with invalid status if status == 500", func(t *testing.T) {
-		resp := makeResponse(500, "")
-		defer resp.Body.Close()
+		// The body gets closed within makeResponse
+		// nolint:bodyclose
+		resp := makeResponse(t, 500, "")
 		_, err := handleResponse(resp)
 		require.Error(t, err)
 		assert.Contains(t, err.Error(), "invalid status")
 	})
 }
 
-func makeResponse(status int, body string) *http.Response {
+func makeResponse(t *testing.T, status int, body string) *http.Response {
+	t.Helper()
+
 	return &http.Response{
 		StatusCode: status,
-		Body:       makeBody(body),
+		Body:       makeBody(t, body),
 	}
 }
 
-func makeBody(body string) io.ReadCloser {
-	return ioutil.NopCloser(bytes.NewReader([]byte(body)))
+func makeBody(t *testing.T, body string) io.ReadCloser {
+	t.Helper()
+
+	reader := ioutil.NopCloser(bytes.NewReader([]byte(body)))
+	t.Cleanup(func() {
+		err := reader.Close()
+		assert.NoError(t, err)
+	})
+	return reader
 }
 
 func asBadRequestError(t *testing.T, err error) *BadRequestError {

pkg/cmd/grafana-server/main.go

@@ -108,7 +108,11 @@ func main() {
 }
 
 func executeServer(configFile, homePath, pidFile, packaging string, traceDiagnostics *tracingDiagnostics) error {
-	defer log.Close()
+	defer func() {
+		if err := log.Close(); err != nil {
+			fmt.Fprintf(os.Stderr, "Failed to close log: %s\n", err)
+		}
+	}()
 
 	if traceDiagnostics.enabled {
 		fmt.Println("diagnostics: tracing enabled", "file", traceDiagnostics.file)
@@ -183,7 +187,9 @@ func listenToSystemSignals(s *server.Server) {
 	for {
 		select {
 		case <-sighupChan:
-			log.Reload()
+			if err := log.Reload(); err != nil {
+				fmt.Fprintf(os.Stderr, "Failed to reload loggers: %s\n", err)
+			}
 		case sig := <-signalChan:
 			s.Shutdown(fmt.Sprintf("System signal: %s", sig))
 		}

pkg/components/imguploader/azureblobuploader.go

@@ -70,9 +70,17 @@ func (az *AzureBlobUploader) Upload(ctx context.Context, imageDiskPath string) (
 	if err != nil {
 		return "", err
 	}
+	defer func() {
+		if err := resp.Body.Close(); err != nil {
+			logger.Warn("Failed to close response body", "err", err)
+		}
+	}()
 
 	if resp.StatusCode > 400 && resp.StatusCode < 600 {
-		body, _ := ioutil.ReadAll(io.LimitReader(resp.Body, 1<<20))
+		body, err := ioutil.ReadAll(io.LimitReader(resp.Body, 1<<20))
+		if err != nil {
+			return "", err
+		}
 		aerr := &Error{
 			Code:   resp.StatusCode,
 			Status: resp.Status,
@@ -80,7 +88,6 @@ func (az *AzureBlobUploader) Upload(ctx context.Context, imageDiskPath string) (
 			Header: resp.Header,
 		}
 		aerr.parseXML()
-		resp.Body.Close()
 		return "", aerr
 	}
 

pkg/components/imguploader/webdavuploader.go

@@ -78,10 +78,17 @@ func (u *WebdavUploader) Upload(ctx context.Context, imgToUpload string) (string
 	if err != nil {
 		return "", err
 	}
-	defer res.Body.Close()
+	defer func() {
+		if err := res.Body.Close(); err != nil {
+			logger.Warn("Failed to close response body", "err", err)
+		}
+	}()
 
 	if res.StatusCode != http.StatusCreated {
-		body, _ := ioutil.ReadAll(res.Body)
+		body, err := ioutil.ReadAll(res.Body)
+		if err != nil {
+			return "", fmt.Errorf("failed to read response body: %w", err)
+		}
 		return "", fmt.Errorf("failed to upload image, statuscode: %d, body: %s", res.StatusCode, body)
 	}
 

pkg/infra/fs/exists_test.go

@@ -5,6 +5,7 @@ import (
 	"os"
 	"testing"
 
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
@@ -18,7 +19,10 @@ func TestExists_NonExistent(t *testing.T) {
 func TestExists_Existent(t *testing.T) {
 	f, err := ioutil.TempFile("", "")
 	require.NoError(t, err)
-	defer os.Remove(f.Name())
+	t.Cleanup(func() {
+		err := os.Remove(f.Name())
+		assert.NoError(t, err)
+	})
 
 	exists, err := Exists(f.Name())
 	require.NoError(t, err)

pkg/infra/log/file.go

@@ -55,11 +55,15 @@ func (l *MuxWriter) Write(b []byte) (int, error) {
 }
 
 // set os.File in writer.
-func (l *MuxWriter) SetFd(fd *os.File) {
+func (l *MuxWriter) setFD(fd *os.File) error {
 	if l.fd != nil {
-		l.fd.Close()
+		if err := l.fd.Close(); err != nil {
+			return err
+		}
 	}
+
 	l.fd = fd
+	return nil
 }
 
 // create a FileLogWriter returning as LoggerInterface.
@@ -98,13 +102,17 @@ func (w *FileLogWriter) StartLogger() error {
 	if err != nil {
 		return err
 	}
-	w.mw.SetFd(fd)
+	if err := w.mw.setFD(fd); err != nil {
+		return err
+	}
+
 	return w.initFd()
 }
 
 func (w *FileLogWriter) docheck(size int) {
 	w.startLock.Lock()
 	defer w.startLock.Unlock()
+
 	if w.Rotate && ((w.Maxlines > 0 && w.maxlinesCurlines >= w.Maxlines) ||
 		(w.Maxsize > 0 && w.maxsizeCursize >= w.Maxsize) ||
 		(w.Daily && time.Now().Day() != w.dailyOpendate)) {
@@ -119,6 +127,9 @@ func (w *FileLogWriter) docheck(size int) {
 
 func (w *FileLogWriter) createLogFile() (*os.File, error) {
 	// Open the log file
+	// We can ignore G304 here since we can't unconditionally lock these log files down to be readable only
+	// by the owner
+	// nolint:gosec
 	return os.OpenFile(w.Filename, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0644)
 }
 
@@ -187,7 +198,9 @@ func (w *FileLogWriter) DoRotate() error {
 		defer w.mw.Unlock()
 
 		fd := w.mw.fd
-		fd.Close()
+		if err := fd.Close(); err != nil {
+			return err
+		}
 
 		// close fd before rename
 		// Rename the file to its newfound home
@@ -228,8 +241,8 @@ func (w *FileLogWriter) deleteOldLog() {
 }
 
 // destroy file logger, close file writer.
-func (w *FileLogWriter) Close() {
-	w.mw.fd.Close()
+func (w *FileLogWriter) Close() error {
+	return w.mw.fd.Close()
 }
 
 // flush file logger.
@@ -242,18 +255,22 @@ func (w *FileLogWriter) Flush() {
 }
 
 // Reload file logger
-func (w *FileLogWriter) Reload() {
+func (w *FileLogWriter) Reload() error {
 	// block Logger's io.Writer
 	w.mw.Lock()
 	defer w.mw.Unlock()
 
 	// Close
 	fd := w.mw.fd
-	fd.Close()
+	if err := fd.Close(); err != nil {
+		return err
+	}
 
 	// Open again
 	err := w.StartLogger()
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "Reload StartLogger: %s\n", err)
+		return err
 	}
+
+	return nil
 }

pkg/infra/log/file_test.go

@@ -23,9 +23,10 @@ func TestLogFile(t *testing.T) {
 	require.NotNil(t, fileLogWrite)
 
 	t.Cleanup(func() {
-		fileLogWrite.Close()
-		err := os.Remove(fileLogWrite.Filename)
-		require.NoError(t, err)
+		err := fileLogWrite.Close()
+		assert.NoError(t, err)
+		err = os.Remove(fileLogWrite.Filename)
+		assert.NoError(t, err)
 	})
 
 	fileLogWrite.Filename = "grafana_test.log"

pkg/infra/log/handlers.go

@@ -1,9 +1,9 @@
 package log
 
 type DisposableHandler interface {
-	Close()
+	Close() error
 }
 
 type ReloadableHandler interface {
-	Reload()
+	Reload() error
 }

pkg/infra/log/log.go

@@ -69,6 +69,10 @@ func Infof(format string, v ...interface{}) {
 	Root.Info(message)
 }
 
+func Warn(msg string, v ...interface{}) {
+	Root.Warn(msg, v...)
+}
+
 func Warnf(format string, v ...interface{}) {
 	var message string
 	if len(v) > 0 {
@@ -90,21 +94,33 @@ func Errorf(skip int, format string, v ...interface{}) {
 
 func Fatalf(skip int, format string, v ...interface{}) {
 	Root.Crit(fmt.Sprintf(format, v...))
-	Close()
+	if err := Close(); err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to close log: %s\n", err)
+	}
 	os.Exit(1)
 }
 
-func Close() {
+func Close() error {
+	var err error
 	for _, logger := range loggersToClose {
-		logger.Close()
+		if e := logger.Close(); e != nil && err == nil {
+			err = e
+		}
 	}
 	loggersToClose = make([]DisposableHandler, 0)
+
+	return err
 }
 
-func Reload() {
+// Reload reloads all loggers.
+func Reload() error {
 	for _, logger := range loggersToReload {
-		logger.Reload()
+		if err := logger.Reload(); err != nil {
+			return err
+		}
 	}
+
+	return nil
 }
 
 var logLevels = map[string]log15.Lvl{
@@ -164,7 +180,9 @@ func getLogFormat(format string) log15.Format {
 }
 
 func ReadLoggingConfig(modes []string, logsPath string, cfg *ini.File) error {
-	Close()
+	if err := Close(); err != nil {
+		return err
+	}
 
 	defaultLevelName, _ := getLogLevelFromConfig("log", "info", cfg)
 	defaultFilters := getFilters(util.SplitString(cfg.Section("log").Key("filters").String()))

pkg/infra/log/syslog.go

@@ -77,8 +77,8 @@ func (sw *SysLogHandler) Log(r *log15.Record) error {
 	return err
 }
 
-func (sw *SysLogHandler) Close() {
-	sw.syslog.Close()
+func (sw *SysLogHandler) Close() error {
+	return sw.syslog.Close()
 }
 
 var facilities = map[string]syslog.Priority{

pkg/infra/log/syslog_windows.go

@@ -18,5 +18,6 @@ func (sw *SysLogHandler) Log(r *log15.Record) error {
 	return nil
 }
 
-func (sw *SysLogHandler) Close() {
+func (sw *SysLogHandler) Close() error {
+	return nil
 }

pkg/infra/metrics/graphitebridge/graphite.go

@@ -27,6 +27,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/grafana/grafana/pkg/cmd/grafana-cli/logger"
 	"github.com/prometheus/client_golang/prometheus"
 	dto "github.com/prometheus/client_model/go"
 	"github.com/prometheus/common/expfmt"
@@ -201,7 +202,11 @@ func (b *Bridge) Push() error {
 	if err != nil {
 		return err
 	}
-	defer conn.Close()
+	defer func() {
+		if err := conn.Close(); err != nil {
+			logger.Warn("Failed to close connection", "err", err)
+		}
+	}()
 
 	return b.writeMetrics(conn, mfs, b.prefix, model.Now())
 }

pkg/infra/metrics/graphitebridge/graphite_test.go

@@ -12,14 +12,16 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 	dto "github.com/prometheus/client_model/go"
 	"github.com/prometheus/common/model"
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
 func TestCountersAsDelta(t *testing.T) {
-	b, _ := NewBridge(&Config{
+	b, err := NewBridge(&Config{
 		URL:             "localhost:12345",
 		CountersAsDelta: true,
 	})
+	require.NoError(t, err)
 	ty := dto.MetricType(0)
 	mf := &dto.MetricFamily{
 		Type:   &ty,
@@ -442,29 +444,21 @@ func TestSkipNanValues(t *testing.T) {
 		Gatherer:        reg,
 		CountersAsDelta: true,
 	})
-	if err != nil {
-		t.Fatalf("error creating bridge: %v", err)
-	}
+	require.NoError(t, err)
 
 	// first collect
 	mfs, err := reg.Gather()
-	if err != nil {
-		t.Fatalf("error: %v", err)
-	}
+	require.NoError(t, err)
 
 	var buf bytes.Buffer
 	err = b.writeMetrics(&buf, mfs, "prefix.", model.Time(1477043083))
-	if err != nil {
-		t.Fatalf("error: %v", err)
-	}
+	require.NoError(t, err)
 
 	want := `prefix.http_request_total_sum.constname.constvalue 0 1477043
 prefix.http_request_total_count.constname.constvalue.count 0 1477043
 `
 
-	if got := buf.String(); want != got {
-		t.Fatalf("wanted \n%s\n, got \n%s\n", want, got)
-	}
+	assert.Equal(t, want, buf.String())
 }
 
 func TestPush(t *testing.T) {
@@ -489,20 +483,17 @@ func TestPush(t *testing.T) {
 		Gatherer: reg,
 		Prefix:   "prefix.",
 	})
-	if err != nil {
-		t.Fatalf("error creating bridge: %v", err)
-	}
+	require.NoError(t, err)
 
 	nmg, err := newMockGraphite(port)
-	if err != nil {
-		t.Fatalf("error creating mock graphite: %v", err)
-	}
-	defer nmg.Close()
+	require.NoError(t, err)
+	t.Cleanup(func() {
+		err := nmg.Close()
+		require.NoError(t, err)
+	})
 
 	err = b.Push()
-	if err != nil {
-		t.Fatalf("error pushing: %v", err)
-	}
+	require.NoError(t, err)
 
 	wants := []string{
 		"prefix.name.constname.constvalue.labelname.val1.count 1",

pkg/infra/tracing/tracing.go

@@ -130,7 +130,7 @@ func (ts *TracingService) Run(ctx context.Context) error {
 
 	if ts.closer != nil {
 		ts.log.Info("Closing tracing")
-		ts.closer.Close()
+		return ts.closer.Close()
 	}
 
 	return nil

pkg/infra/tracing/tracing_test.go

@@ -58,9 +58,11 @@ func TestInitJaegerCfg_Enabled(t *testing.T) {
 }
 
 func TestInitJaegerCfg_DisabledViaEnv(t *testing.T) {
-	os.Setenv("JAEGER_DISABLED", "true")
+	err := os.Setenv("JAEGER_DISABLED", "true")
+	require.NoError(t, err)
 	defer func() {
-		os.Unsetenv("JAEGER_DISABLED")
+		err := os.Unsetenv("JAEGER_DISABLED")
+		require.NoError(t, err)
 	}()
 
 	ts := &TracingService{enabled: true}
@@ -71,9 +73,11 @@ func TestInitJaegerCfg_DisabledViaEnv(t *testing.T) {
 }
 
 func TestInitJaegerCfg_EnabledViaEnv(t *testing.T) {
-	os.Setenv("JAEGER_DISABLED", "false")
+	err := os.Setenv("JAEGER_DISABLED", "false")
+	require.NoError(t, err)
 	defer func() {
-		os.Unsetenv("JAEGER_DISABLED")
+		err := os.Unsetenv("JAEGER_DISABLED")
+		require.NoError(t, err)
 	}()
 
 	ts := &TracingService{enabled: false}
@@ -84,12 +88,14 @@ func TestInitJaegerCfg_EnabledViaEnv(t *testing.T) {
 }
 
 func TestInitJaegerCfg_InvalidEnvVar(t *testing.T) {
-	os.Setenv("JAEGER_DISABLED", "totallybogus")
+	err := os.Setenv("JAEGER_DISABLED", "totallybogus")
+	require.NoError(t, err)
 	defer func() {
-		os.Unsetenv("JAEGER_DISABLED")
+		err := os.Unsetenv("JAEGER_DISABLED")
+		require.NoError(t, err)
 	}()
 
 	ts := &TracingService{}
-	_, err := ts.initJaegerCfg()
+	_, err = ts.initJaegerCfg()
 	require.EqualError(t, err, "cannot parse env var JAEGER_DISABLED=totallybogus: strconv.ParseBool: parsing \"totallybogus\": invalid syntax")
 }

pkg/infra/usagestats/service.go

@@ -50,7 +50,9 @@ func (uss *UsageStatsService) Run(ctx context.Context) error {
 	for {
 		select {
 		case <-onceEveryDayTick.C:
-			uss.sendUsageStats()
+			if err := uss.sendUsageStats(); err != nil {
+				metricsLogger.Warn("Failed to send usage stats", "err", err)
+			}
 		case <-everyMinuteTicker.C:
 			uss.updateTotalStats()
 		case <-ctx.Done():

pkg/infra/usagestats/usage_stats.go

@@ -186,19 +186,22 @@ func (uss *UsageStatsService) GetUsageReport() (UsageReport, error) {
 	return report, nil
 }
 
-func (uss *UsageStatsService) sendUsageStats() {
+func (uss *UsageStatsService) sendUsageStats() error {
 	if !setting.ReportingEnabled {
-		return
+		return nil
 	}
 
 	metricsLogger.Debug(fmt.Sprintf("Sending anonymous usage stats to %s", usageStatsURL))
 
 	report, err := uss.GetUsageReport()
 	if err != nil {
-		return
+		return err
 	}
 
-	out, _ := json.MarshalIndent(report, "", " ")
+	out, err := json.MarshalIndent(report, "", " ")
+	if err != nil {
+		return err
+	}
 	data := bytes.NewBuffer(out)
 
 	client := http.Client{Timeout: 5 * time.Second}
@@ -208,8 +211,12 @@ func (uss *UsageStatsService) sendUsageStats() {
 			metricsLogger.Error("Failed to send usage stats", "err", err)
 			return
 		}
-		resp.Body.Close()
+		if err := resp.Body.Close(); err != nil {
+			metricsLogger.Warn("Failed to close response body", "err", err)
+		}
 	}()
+
+	return nil
 }
 
 func (uss *UsageStatsService) updateTotalStats() {

pkg/infra/usagestats/usage_stats_test.go

@@ -10,6 +10,7 @@ import (
 
 	"github.com/grafana/grafana/pkg/services/alerting"
 	"github.com/grafana/grafana/pkg/services/licensing"
+	"github.com/stretchr/testify/require"
 
 	"net/http"
 	"net/http/httptest"
@@ -171,11 +172,13 @@ func TestMetrics(t *testing.T) {
 			"grafana_com":   true,
 		}
 
-		uss.sendUsageStats()
+		err := uss.sendUsageStats()
+		require.NoError(t, err)
 
 		Convey("Given reporting not enabled and sending usage stats", func() {
 			setting.ReportingEnabled = false
-			uss.sendUsageStats()
+			err := uss.sendUsageStats()
+			require.NoError(t, err)
 
 			Convey("Should not gather stats or call http endpoint", func() {
 				So(getSystemStatsQuery, ShouldBeNil)
@@ -195,7 +198,8 @@ func TestMetrics(t *testing.T) {
 			setting.Packaging = "deb"
 
 			wg.Add(1)
-			uss.sendUsageStats()
+			err := uss.sendUsageStats()
+			require.NoError(t, err)
 
 			Convey("Should gather stats and call http endpoint", func() {
 				if waitTimeout(&wg, 2*time.Second) {

pkg/login/social/azuread_oauth.go

@@ -56,7 +56,7 @@ func (s *SocialAzureAD) UserInfo(_ *http.Client, token *oauth2.Token) (*BasicUse
 
 	groups := extractGroups(claims)
 	if !s.IsGroupMember(groups) {
-		return nil, ErrMissingGroupMembership
+		return nil, errMissingGroupMembership
 	}
 
 	return &BasicUserInfo{

pkg/login/social/common.go

@@ -14,10 +14,10 @@ import (
 )
 
 var (
-	ErrMissingGroupMembership = &Error{"User not a member of one of the required groups"}
+	errMissingGroupMembership = Error{"user not a member of one of the required groups"}
 )
 
-type HttpGetResponse struct {
+type httpGetResponse struct {
 	Body    []byte
 	Headers http.Header
 }
@@ -44,20 +44,24 @@ func isEmailAllowed(email string, allowedDomains []string) bool {
 	return valid
 }
 
-func HttpGet(client *http.Client, url string) (response HttpGetResponse, err error) {
+func (s *SocialBase) httpGet(client *http.Client, url string) (response httpGetResponse, err error) {
 	r, err := client.Get(url)
 	if err != nil {
 		return
 	}
 
-	defer r.Body.Close()
+	defer func() {
+		if err := r.Body.Close(); err != nil {
+			s.log.Warn("Failed to close response body", "err", err)
+		}
+	}()
 
 	body, err := ioutil.ReadAll(r.Body)
 	if err != nil {
 		return
 	}
 
-	response = HttpGetResponse{body, r.Header}
+	response = httpGetResponse{body, r.Header}
 
 	if r.StatusCode >= 300 {
 		err = fmt.Errorf(string(response.Body))

pkg/login/social/generic_oauth.go

@@ -229,7 +229,11 @@ func (s *SocialGenericOAuth) extractFromToken(token *oauth2.Token) *UserInfoJson
 			s.log.Error("Error creating zlib reader", "error", err)
 			return nil
 		}
-		defer fr.Close()
+		defer func() {
+			if err := fr.Close(); err != nil {
+				s.log.Warn("Failed closing zlib reader", "error", err)
+			}
+		}()
 		rawJSON, err = ioutil.ReadAll(fr)
 		if err != nil {
 			s.log.Error("Error decompressing payload", "error", err)
@@ -251,7 +255,7 @@ func (s *SocialGenericOAuth) extractFromToken(token *oauth2.Token) *UserInfoJson
 
 func (s *SocialGenericOAuth) extractFromAPI(client *http.Client) *UserInfoJson {
 	s.log.Debug("Getting user info from API")
-	rawUserInfoResponse, err := HttpGet(client, s.apiUrl)
+	rawUserInfoResponse, err := s.httpGet(client, s.apiUrl)
 	if err != nil {
 		s.log.Debug("Error getting user info from API", "url", s.apiUrl, "error", err)
 		return nil
@@ -347,7 +351,7 @@ func (s *SocialGenericOAuth) FetchPrivateEmail(client *http.Client) (string, err
 		IsConfirmed bool   `json:"is_confirmed"`
 	}
 
-	response, err := HttpGet(client, fmt.Sprintf(s.apiUrl+"/emails"))
+	response, err := s.httpGet(client, fmt.Sprintf(s.apiUrl+"/emails"))
 	if err != nil {
 		s.log.Error("Error getting email address", "url", s.apiUrl+"/emails", "error", err)
 		return "", errutil.Wrap("Error getting email address", err)
@@ -390,7 +394,7 @@ func (s *SocialGenericOAuth) FetchTeamMemberships(client *http.Client) ([]int, b
 		Id int `json:"id"`
 	}
 
-	response, err := HttpGet(client, fmt.Sprintf(s.apiUrl+"/teams"))
+	response, err := s.httpGet(client, fmt.Sprintf(s.apiUrl+"/teams"))
 	if err != nil {
 		s.log.Error("Error getting team memberships", "url", s.apiUrl+"/teams", "error", err)
 		return nil, false
@@ -419,7 +423,7 @@ func (s *SocialGenericOAuth) FetchOrganizations(client *http.Client) ([]string,
 		Login string `json:"login"`
 	}
 
-	response, err := HttpGet(client, fmt.Sprintf(s.apiUrl+"/orgs"))
+	response, err := s.httpGet(client, fmt.Sprintf(s.apiUrl+"/orgs"))
 	if err != nil {
 		s.log.Error("Error getting organizations", "url", s.apiUrl+"/orgs", "error", err)
 		return nil, false

pkg/login/social/github_oauth.go

@@ -29,8 +29,8 @@ type GithubTeam struct {
 }
 
 var (
-	ErrMissingTeamMembership         = &Error{"User not a member of one of the required teams"}
-	ErrMissingOrganizationMembership = &Error{"User not a member of one of the required organizations"}
+	ErrMissingTeamMembership         = Error{"user not a member of one of the required teams"}
+	ErrMissingOrganizationMembership = Error{"user not a member of one of the required organizations"}
 )
 
 func (s *SocialGithub) Type() int {
@@ -86,7 +86,7 @@ func (s *SocialGithub) FetchPrivateEmail(client *http.Client) (string, error) {
 		Verified bool   `json:"verified"`
 	}
 
-	response, err := HttpGet(client, fmt.Sprintf(s.apiUrl+"/emails"))
+	response, err := s.httpGet(client, fmt.Sprintf(s.apiUrl+"/emails"))
 	if err != nil {
 		return "", fmt.Errorf("Error getting email address: %s", err)
 	}
@@ -114,7 +114,7 @@ func (s *SocialGithub) FetchTeamMemberships(client *http.Client) ([]GithubTeam,
 	teams := make([]GithubTeam, 0)
 
 	for hasMore {
-		response, err := HttpGet(client, url)
+		response, err := s.httpGet(client, url)
 		if err != nil {
 			return nil, fmt.Errorf("Error getting team memberships: %s", err)
 		}
@@ -157,16 +157,16 @@ func (s *SocialGithub) FetchOrganizations(client *http.Client, organizationsUrl
 		Login string `json:"login"`
 	}
 
-	response, err := HttpGet(client, organizationsUrl)
+	response, err := s.httpGet(client, organizationsUrl)
 	if err != nil {
-		return nil, fmt.Errorf("Error getting organizations: %s", err)
+		return nil, fmt.Errorf("error getting organizations: %s", err)
 	}
 
 	var records []Record
 
 	err = json.Unmarshal(response.Body, &records)
 	if err != nil {
-		return nil, fmt.Errorf("Error getting organizations: %s", err)
+		return nil, fmt.Errorf("error getting organizations: %s", err)
 	}
 
 	var logins = make([]string, len(records))
@@ -184,9 +184,9 @@ func (s *SocialGithub) UserInfo(client *http.Client, token *oauth2.Token) (*Basi
 		Email string `json:"email"`
 	}
 
-	response, err := HttpGet(client, s.apiUrl)
+	response, err := s.httpGet(client, s.apiUrl)
 	if err != nil {
-		return nil, fmt.Errorf("Error getting user info: %s", err)
+		return nil, fmt.Errorf("error getting user info: %s", err)
 	}
 
 	err = json.Unmarshal(response.Body, &data)

pkg/login/social/gitlab_oauth.go

@@ -62,7 +62,7 @@ func (s *SocialGitlab) GetGroupsPage(client *http.Client, url string) ([]string,
 		return nil, next
 	}
 
-	response, err := HttpGet(client, url)
+	response, err := s.httpGet(client, url)
 	if err != nil {
 		s.log.Error("Error getting groups from GitLab API", "err", err)
 		return nil, next
@@ -98,7 +98,7 @@ func (s *SocialGitlab) UserInfo(client *http.Client, token *oauth2.Token) (*Basi
 		State    string
 	}
 
-	response, err := HttpGet(client, s.apiUrl+"/user")
+	response, err := s.httpGet(client, s.apiUrl+"/user")
 	if err != nil {
 		return nil, fmt.Errorf("Error getting user info: %s", err)
 	}
@@ -123,7 +123,7 @@ func (s *SocialGitlab) UserInfo(client *http.Client, token *oauth2.Token) (*Basi
 	}
 
 	if !s.IsGroupMember(groups) {
-		return nil, ErrMissingGroupMembership
+		return nil, errMissingGroupMembership
 	}
 
 	return userInfo, nil

pkg/login/social/google_oauth.go

@@ -27,7 +27,7 @@ func (s *SocialGoogle) UserInfo(client *http.Client, token *oauth2.Token) (*Basi
 		Email string `json:"email"`
 	}
 
-	response, err := HttpGet(client, s.apiUrl)
+	response, err := s.httpGet(client, s.apiUrl)
 	if err != nil {
 		return nil, fmt.Errorf("Error getting user info: %s", err)
 	}

pkg/login/social/grafana_com_oauth.go

@@ -54,7 +54,7 @@ func (s *SocialGrafanaCom) UserInfo(client *http.Client, token *oauth2.Token) (*
 		Orgs  []OrgRecord `json:"orgs"`
 	}
 
-	response, err := HttpGet(client, s.url+"/api/oauth2/user")
+	response, err := s.httpGet(client, s.url+"/api/oauth2/user")
 	if err != nil {
 		return nil, fmt.Errorf("Error getting user info: %s", err)
 	}

pkg/login/social/okta_oauth.go

@@ -84,7 +84,7 @@ func (s *SocialOkta) UserInfo(client *http.Client, token *oauth2.Token) (*BasicU
 
 	groups := s.GetGroups(&data)
 	if !s.IsGroupMember(groups) {
-		return nil, ErrMissingGroupMembership
+		return nil, errMissingGroupMembership
 	}
 
 	return &BasicUserInfo{
@@ -98,7 +98,7 @@ func (s *SocialOkta) UserInfo(client *http.Client, token *oauth2.Token) (*BasicU
 }
 
 func (s *SocialOkta) extractAPI(data *OktaUserInfoJson, client *http.Client) error {
-	rawUserInfoResponse, err := HttpGet(client, s.apiUrl)
+	rawUserInfoResponse, err := s.httpGet(client, s.apiUrl)
 	if err != nil {
 		s.log.Debug("Error getting user info response", "url", s.apiUrl, "error", err)
 		return errutil.Wrapf(err, "error getting user info response")

pkg/login/social/social.go

@@ -54,7 +54,7 @@ type Error struct {
 	s string
 }
 
-func (e *Error) Error() string {
+func (e Error) Error() string {
 	return e.s
 }
 

pkg/middleware/dashboard_redirect_test.go

@@ -35,8 +35,12 @@ func TestMiddlewareDashboardRedirect(t *testing.T) {
 			sc.fakeReqWithParams("GET", "/dashboard/db/dash?orgId=1&panelId=2", map[string]string{}).exec()
 
 			assert.Equal(t, 301, sc.resp.Code)
+			// nolint:bodyclose
 			resp := sc.resp.Result()
-			resp.Body.Close()
+			t.Cleanup(func() {
+				err := resp.Body.Close()
+				assert.NoError(t, err)
+			})
 			redirectURL, err := resp.Location()
 			require.NoError(t, err)
 			assert.Equal(t, models.GetDashboardUrl(fakeDash.Uid, fakeDash.Slug), redirectURL.Path)
@@ -54,8 +58,12 @@ func TestMiddlewareDashboardRedirect(t *testing.T) {
 			sc.fakeReqWithParams("GET", "/dashboard-solo/db/dash?orgId=1&panelId=2", map[string]string{}).exec()
 
 			assert.Equal(t, 301, sc.resp.Code)
+			// nolint:bodyclose
 			resp := sc.resp.Result()
-			resp.Body.Close()
+			t.Cleanup(func() {
+				err := resp.Body.Close()
+				assert.NoError(t, err)
+			})
 			redirectURL, err := resp.Location()
 			require.NoError(t, err)
 			expectedURL := models.GetDashboardUrl(fakeDash.Uid, fakeDash.Slug)
@@ -71,8 +79,12 @@ func TestMiddlewareDashboardRedirect(t *testing.T) {
 		sc.fakeReqWithParams("GET", "/d/asd/dash?orgId=1&panelId=12&fullscreen&edit", map[string]string{}).exec()
 
 		assert.Equal(t, 301, sc.resp.Code)
+		// nolint:bodyclose
 		resp := sc.resp.Result()
-		resp.Body.Close()
+		t.Cleanup(func() {
+			err := resp.Body.Close()
+			assert.NoError(t, err)
+		})
 		redirectURL, err := resp.Location()
 		require.NoError(t, err)
 		assert.Equal(t, "/d/asd/d/asd/dash?editPanel=12&orgId=1", redirectURL.String())

pkg/middleware/middleware_test.go

@@ -378,8 +378,10 @@ func TestMiddlewareContext(t *testing.T) {
 				return nil
 			})
 
-			key := fmt.Sprintf(authproxy.CachePrefix, authproxy.HashCacheKey(hdrName+"-"+group))
-			err := sc.remoteCacheService.Set(key, userID, 0)
+			h, err := authproxy.HashCacheKey(hdrName + "-" + group)
+			require.NoError(t, err)
+			key := fmt.Sprintf(authproxy.CachePrefix, h)
+			err = sc.remoteCacheService.Set(key, userID, 0)
 			require.NoError(t, err)
 			sc.fakeReq("GET", "/")
 

pkg/models/datasource_cache_test.go

@@ -9,6 +9,7 @@ import (
 	"time"
 
 	. "github.com/smartystreets/goconvey/convey"
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
 	"github.com/grafana/grafana/pkg/components/securejsondata"
@@ -223,15 +224,16 @@ func TestDataSourceProxyCache(t *testing.T) {
 			// 2. Get HTTP transport from datasource which uses the test server as backend
 			ds.Url = backend.URL
 			transport, err := ds.GetHttpTransport()
-			if err != nil {
-				log.Fatal(err.Error())
-			}
+			So(err, ShouldBeNil)
 
 			// 3. Send test request which should have the Authorization header set
 			req := httptest.NewRequest("GET", backend.URL+"/test-headers", nil)
 			res, err := transport.RoundTrip(req)
 			So(err, ShouldBeNil)
-			defer res.Body.Close()
+			t.Cleanup(func() {
+				err := res.Body.Close()
+				assert.NoError(t, err)
+			})
 			body, err := ioutil.ReadAll(res.Body)
 			So(err, ShouldBeNil)
 			bodyStr := string(body)

pkg/plugins/backendplugin/grpcplugin/client.go

@@ -31,7 +31,10 @@ var handshake = goplugin.HandshakeConfig{
 	MagicCookieValue: grpcplugin.MagicCookieValue,
 }
 
-func newClientConfig(executablePath string, env []string, logger log.Logger, versionedPlugins map[int]goplugin.PluginSet) *goplugin.ClientConfig {
+func newClientConfig(executablePath string, env []string, logger log.Logger,
+	versionedPlugins map[int]goplugin.PluginSet) *goplugin.ClientConfig {
+	// We can ignore gosec G201 here, since the dynamic part of executablePath comes from the plugin definition
+	// nolint:gosec
 	cmd := exec.Command(executablePath)
 	cmd.Env = env
 
@@ -77,7 +80,7 @@ func getV2PluginSet() goplugin.PluginSet {
 
 // NewBackendPlugin creates a new backend plugin factory used for registering a backend plugin.
 func NewBackendPlugin(pluginID, executablePath string, startFns PluginStartFuncs) backendplugin.PluginFactoryFunc {
-	return New(PluginDescriptor{
+	return newPlugin(PluginDescriptor{
 		pluginID:       pluginID,
 		executablePath: executablePath,
 		managed:        true,
@@ -93,7 +96,7 @@ func NewBackendPlugin(pluginID, executablePath string, startFns PluginStartFuncs
 
 // NewRendererPlugin creates a new renderer plugin factory used for registering a backend renderer plugin.
 func NewRendererPlugin(pluginID, executablePath string, startFns PluginStartFuncs) backendplugin.PluginFactoryFunc {
-	return New(PluginDescriptor{
+	return newPlugin(PluginDescriptor{
 		pluginID:       pluginID,
 		executablePath: executablePath,
 		managed:        false,

pkg/plugins/backendplugin/grpcplugin/grpc_plugin.go

@@ -26,8 +26,8 @@ type grpcPlugin struct {
 	mutex         sync.RWMutex
 }
 
-// New allocates and returns a new gRPC (external) backendplugin.Plugin.
-func New(descriptor PluginDescriptor) backendplugin.PluginFactoryFunc {
+// newPlugin allocates and returns a new gRPC (external) backendplugin.Plugin.
+func newPlugin(descriptor PluginDescriptor) backendplugin.PluginFactoryFunc {
 	return backendplugin.PluginFactoryFunc(func(pluginID string, logger log.Logger, env []string) (backendplugin.Plugin, error) {
 		return &grpcPlugin{
 			descriptor: descriptor,

pkg/plugins/backendplugin/manager.go

@@ -257,6 +257,11 @@ func (m *manager) callResourceInternal(w http.ResponseWriter, req *http.Request,
 		childCtx, cancel := context.WithCancel(req.Context())
 		defer cancel()
 		stream := newCallResourceResponseStream(childCtx)
+		defer func() {
+			if err := stream.Close(); err != nil {
+				m.logger.Warn("Failed to close stream", "err", err)
+			}
+		}()
 		var wg sync.WaitGroup
 		wg.Add(1)
 		var flushStreamErr error
@@ -265,12 +270,15 @@ func (m *manager) callResourceInternal(w http.ResponseWriter, req *http.Request,
 			wg.Done()
 		}()
 
-		innerErr := p.CallResource(req.Context(), crReq, stream)
-		stream.Close()
-		if innerErr != nil {
-			return innerErr
+		if err := p.CallResource(req.Context(), crReq, stream); err != nil {
+			return err
 		}
+		if err := stream.Close(); err != nil {
+			return err
+		}
+
 		wg.Wait()
+
 		return flushStreamErr
 	})
 }

pkg/plugins/dashboards.go

@@ -95,11 +95,11 @@ func loadPluginDashboard(pluginId, path string) (*models.Dashboard, error) {
 		return nil, PluginNotFoundError{pluginId}
 	}
 
+	dashboardFilePath := filepath.Join(plugin.PluginDir, path)
 	// nolint:gosec
 	// We can ignore the gosec G304 warning on this one because `plugin.PluginDir` is based
 	// on plugin folder structure on disk and not user input. `path` comes from the
 	// `plugin.json` configuration file for the loaded plugin
-	dashboardFilePath := filepath.Join(plugin.PluginDir, path)
 	reader, err := os.Open(dashboardFilePath)
 	if err != nil {
 		return nil, err

pkg/plugins/plugins.go

@@ -335,9 +335,6 @@ func (s *PluginScanner) walker(currentPath string, f os.FileInfo, err error) err
 		return nil
 	}
 
-	// nolint:gosec
-	// We can ignore the gosec G304 warning on this one because `currentPath` is based
-	// on plugin the folder structure on disk and not user input.
 	if err := s.loadPlugin(currentPath); err != nil {
 		s.log.Error("Failed to load plugin", "error", err, "pluginPath", filepath.Dir(currentPath))
 		s.errors = append(s.errors, err)
@@ -349,6 +346,9 @@ func (s *PluginScanner) walker(currentPath string, f os.FileInfo, err error) err
 func (s *PluginScanner) loadPlugin(pluginJSONFilePath string) error {
 	s.log.Debug("Loading plugin", "path", pluginJSONFilePath)
 	currentDir := filepath.Dir(pluginJSONFilePath)
+	// nolint:gosec
+	// We can ignore the gosec G304 warning on this one because `currentPath` is based
+	// on plugin the folder structure on disk and not user input.
 	reader, err := os.Open(pluginJSONFilePath)
 	if err != nil {
 		return err

pkg/plugins/update_checker.go

@@ -48,13 +48,15 @@ func (pm *PluginManager) checkForUpdates() {
 
 	pluginSlugs := getAllExternalPluginSlugs()
 	resp, err := httpClient.Get("https://grafana.com/api/plugins/versioncheck?slugIn=" + pluginSlugs + "&grafanaVersion=" + setting.BuildVersion)
-
 	if err != nil {
 		log.Tracef("Failed to get plugins repo from grafana.com, %v", err.Error())
 		return
 	}
-
-	defer resp.Body.Close()
+	defer func() {
+		if err := resp.Body.Close(); err != nil {
+			log.Warn("Failed to close response body", "err", err)
+		}
+	}()
 
 	body, err := ioutil.ReadAll(resp.Body)
 	if err != nil {
@@ -91,8 +93,11 @@ func (pm *PluginManager) checkForUpdates() {
 		log.Tracef("Failed to get latest.json repo from github.com: %v", err.Error())
 		return
 	}
-
-	defer resp2.Body.Close()
+	defer func() {
+		if err := resp2.Body.Close(); err != nil {
+			pm.log.Warn("Failed to close response body", "err", err)
+		}
+	}()
 	body, err = ioutil.ReadAll(resp2.Body)
 	if err != nil {
 		log.Tracef("Update check failed, reading response from github.com, %v", err.Error())

pkg/server/server.go

@@ -341,7 +341,11 @@ func (s *Server) notifySystemd(state string) {
 		s.log.Warn("Failed to connect to systemd", "err", err, "socket", notifySocket)
 		return
 	}
-	defer conn.Close()
+	defer func() {
+		if err := conn.Close(); err != nil {
+			s.log.Warn("Failed to close connection", "err", err)
+		}
+	}()
 
 	_, err = conn.Write([]byte(state))
 	if err != nil {

pkg/services/alerting/alerting_usage_test.go

@@ -19,10 +19,13 @@ func TestAlertingUsageStats(t *testing.T) {
 
 	ae.Bus.AddHandler(func(query *models.GetAllAlertsQuery) error {
 		var createFake = func(file string) *simplejson.Json {
+			// Ignore gosec warning G304 since it's a test
+			// nolint:gosec
 			content, err := ioutil.ReadFile(file)
 			require.NoError(t, err, "expected to be able to read file")
 
-			j, _ := simplejson.NewJson(content)
+			j, err := simplejson.NewJson(content)
+			require.NoError(t, err)
 			return j
 		}
 

pkg/services/alerting/notifiers/pushover.go

@@ -387,8 +387,10 @@ func (pn *PushoverNotifier) genPushoverBody(evalContext *alerting.EvalContext, m
 	if err != nil {
 		return nil, b, err
 	}
+	if err := w.Close(); err != nil {
+		return nil, b, err
+	}
 
-	w.Close()
 	headers := map[string]string{
 		"Content-Type": w.FormDataContentType(),
 	}

pkg/services/alerting/notifiers/telegram.go

@@ -170,6 +170,11 @@ func (tn *TelegramNotifier) buildMessageInlineImage(evalContext *alerting.EvalCo
 func (tn *TelegramNotifier) generateTelegramCmd(message string, messageField string, apiAction string, extraConf func(writer *multipart.Writer)) (*models.SendWebhookSync, error) {
 	var body bytes.Buffer
 	w := multipart.NewWriter(&body)
+	defer func() {
+		if err := w.Close(); err != nil {
+			tn.log.Warn("Failed to close writer", "err", err)
+		}
+	}()
 
 	fw, err := w.CreateFormField("chat_id")
 	if err != nil {
@@ -189,7 +194,9 @@ func (tn *TelegramNotifier) generateTelegramCmd(message string, messageField str
 
 	extraConf(w)
 
-	w.Close()
+	if err := w.Close(); err != nil {
+		return nil, err
+	}
 
 	tn.log.Info("Sending telegram notification", "chat_id", tn.ChatID, "bot_token", tn.BotToken, "apiAction", apiAction)
 	url := fmt.Sprintf(telegramAPIURL, tn.BotToken, apiAction)

pkg/services/contexthandler/auth_proxy_test.go

@@ -65,7 +65,9 @@ func TestInitContextWithAuthProxy_CachedInvalidUserID(t *testing.T) {
 		Logger: log.New("Test"),
 	}
 	req.Header.Set(svc.Cfg.AuthProxyHeaderName, name)
-	key := fmt.Sprintf(authproxy.CachePrefix, authproxy.HashCacheKey(name))
+	h, err := authproxy.HashCacheKey(name)
+	require.NoError(t, err)
+	key := fmt.Sprintf(authproxy.CachePrefix, h)
 
 	t.Logf("Injecting stale user ID in cache with key %q", key)
 	err = svc.RemoteCache.Set(key, int64(33), 0)

pkg/services/contexthandler/authproxy/authproxy.go

@@ -141,25 +141,29 @@ func (auth *AuthProxy) IsAllowedIP() error {
 	))
 }
 
-func HashCacheKey(key string) string {
+func HashCacheKey(key string) (string, error) {
 	hasher := fnv.New128a()
-	// according to the documentation, Hash.Write cannot error, but linter is complaining
-	hasher.Write([]byte(key)) // nolint: errcheck
-	return hex.EncodeToString(hasher.Sum(nil))
+	if _, err := hasher.Write([]byte(key)); err != nil {
+		return "", err
+	}
+	return hex.EncodeToString(hasher.Sum(nil)), nil
 }
 
 // getKey forms a key for the cache based on the headers received as part of the authentication flow.
 // Our configuration supports multiple headers. The main header contains the email or username.
 // And the additional ones that allow us to specify extra attributes: Name, Email or Groups.
-func (auth *AuthProxy) getKey() string {
+func (auth *AuthProxy) getKey() (string, error) {
 	key := strings.TrimSpace(auth.header) // start the key with the main header
 
 	auth.headersIterator(func(_, header string) {
 		key = strings.Join([]string{key, header}, "-") // compose the key with any additional headers
 	})
 
-	hashedKey := HashCacheKey(key)
-	return fmt.Sprintf(CachePrefix, hashedKey)
+	hashedKey, err := HashCacheKey(key)
+	if err != nil {
+		return "", err
+	}
+	return fmt.Sprintf(CachePrefix, hashedKey), nil
 }
 
 // Login logs in user ID by whatever means possible.
@@ -194,7 +198,10 @@ func (auth *AuthProxy) Login(logger log.Logger, ignoreCache bool) (int64, error)
 
 // GetUserViaCache gets user ID from cache.
 func (auth *AuthProxy) GetUserViaCache(logger log.Logger) (int64, error) {
-	cacheKey := auth.getKey()
+	cacheKey, err := auth.getKey()
+	if err != nil {
+		return 0, err
+	}
 	logger.Debug("Getting user ID via auth cache", "cacheKey", cacheKey)
 	userID, err := auth.remoteCache.Get(cacheKey)
 	if err != nil {
@@ -208,7 +215,10 @@ func (auth *AuthProxy) GetUserViaCache(logger log.Logger) (int64, error) {
 
 // RemoveUserFromCache removes user from cache.
 func (auth *AuthProxy) RemoveUserFromCache(logger log.Logger) error {
-	cacheKey := auth.getKey()
+	cacheKey, err := auth.getKey()
+	if err != nil {
+		return err
+	}
 	logger.Debug("Removing user from auth cache", "cacheKey", cacheKey)
 	if err := auth.remoteCache.Delete(cacheKey); err != nil {
 		return err
@@ -318,18 +328,20 @@ func (auth *AuthProxy) GetSignedInUser(userID int64) (*models.SignedInUser, erro
 
 // Remember user in cache
 func (auth *AuthProxy) Remember(id int64) error {
-	key := auth.getKey()
+	key, err := auth.getKey()
+	if err != nil {
+		return err
+	}
 
 	// Check if user already in cache
-	userID, _ := auth.remoteCache.Get(key)
-	if userID != nil {
+	userID, err := auth.remoteCache.Get(key)
+	if err == nil && userID != nil {
 		return nil
 	}
 
 	expiration := time.Duration(auth.cfg.AuthProxySyncTTL) * time.Minute
 
-	err := auth.remoteCache.Set(key, id, expiration)
-	if err != nil {
+	if err := auth.remoteCache.Set(key, id, expiration); err != nil {
 		return err
 	}
 

pkg/services/contexthandler/authproxy/authproxy_test.go

@@ -87,12 +87,16 @@ func TestMiddlewareContext(t *testing.T) {
 	t.Run("When the cache only contains the main header with a simple cache key", func(t *testing.T) {
 		const id int64 = 33
 		// Set cache key
-		key := fmt.Sprintf(CachePrefix, HashCacheKey(hdrName))
-		err := cache.Set(key, id, 0)
+		h, err := HashCacheKey(hdrName)
+		require.NoError(t, err)
+		key := fmt.Sprintf(CachePrefix, h)
+		err = cache.Set(key, id, 0)
 		require.NoError(t, err)
 		// Set up the middleware
 		auth := prepareMiddleware(t, cache, nil)
-		assert.Equal(t, key, auth.getKey())
+		gotKey, err := auth.getKey()
+		require.NoError(t, err)
+		assert.Equal(t, key, gotKey)
 
 		gotID, err := auth.Login(logger, false)
 		require.NoError(t, err)
@@ -104,15 +108,17 @@ func TestMiddlewareContext(t *testing.T) {
 		const id int64 = 33
 		const group = "grafana-core-team"
 
-		key := fmt.Sprintf(CachePrefix, HashCacheKey(hdrName+"-"+group))
-		err := cache.Set(key, id, 0)
+		h, err := HashCacheKey(hdrName + "-" + group)
+		require.NoError(t, err)
+		key := fmt.Sprintf(CachePrefix, h)
+		err = cache.Set(key, id, 0)
 		require.NoError(t, err)
 
 		auth := prepareMiddleware(t, cache, func(req *http.Request, cfg *setting.Cfg) {
 			req.Header.Set("X-WEBAUTH-GROUPS", group)
 			cfg.AuthProxyHeaders = map[string]string{"Groups": "X-WEBAUTH-GROUPS"}
 		})
-		assert.Equal(t, "auth-proxy-sync-ttl:14f69b7023baa0ac98c96b31cec07bc0", auth.getKey())
+		assert.Equal(t, "auth-proxy-sync-ttl:14f69b7023baa0ac98c96b31cec07bc0", key)
 
 		gotID, err := auth.Login(logger, false)
 		require.NoError(t, err)

pkg/services/contexthandler/contexthandler_test.go

@@ -64,8 +64,12 @@ func TestTokenRotationAtEndOfRequest(t *testing.T) {
 	ctxHdlr.rotateEndOfRequestFunc(reqContext, uts, token)(reqContext.Resp)
 
 	foundLoginCookie := false
+	// nolint:bodyclose
 	resp := rr.Result()
-	defer resp.Body.Close()
+	t.Cleanup(func() {
+		err := resp.Body.Close()
+		assert.NoError(t, err)
+	})
 	for _, c := range resp.Cookies() {
 		if c.Name == "login_token" {
 			foundLoginCookie = true

pkg/services/ldap/settings_test.go

@@ -5,6 +5,7 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestReadingLDAPSettings(t *testing.T) {
@@ -14,9 +15,10 @@ func TestReadingLDAPSettings(t *testing.T) {
 }
 
 func TestReadingLDAPSettingsWithEnvVariable(t *testing.T) {
-	os.Setenv("ENV_PASSWORD", "MySecret")
+	err := os.Setenv("ENV_PASSWORD", "MySecret")
+	require.NoError(t, err)
 
 	config, err := readConfig("testdata/ldap.toml")
-	assert.Nil(t, err, "No error when reading ldap config")
+	require.NoError(t, err)
 	assert.EqualValues(t, "MySecret", config.Servers[0].BindPassword)
 }

pkg/services/notifications/webhook.go

@@ -76,8 +76,11 @@ func (ns *NotificationService) sendWebRequestSync(ctx context.Context, webhook *
 	if err != nil {
 		return err
 	}
-
-	defer resp.Body.Close()
+	defer func() {
+		if err := resp.Body.Close(); err != nil {
+			ns.log.Warn("Failed to close response body", "err", err)
+		}
+	}()
 
 	if resp.StatusCode/100 == 2 {
 		ns.log.Debug("Webhook succeeded", "url", webhook.Url, "statuscode", resp.Status)

pkg/services/provisioning/values/values_test.go

@@ -19,10 +19,14 @@ import (
 
 func TestValues(t *testing.T) {
 	Convey("Values", t, func() {
-		os.Setenv("INT", "1")
-		os.Setenv("STRING", "test")
-		os.Setenv("EMPTYSTRING", "")
-		os.Setenv("BOOL", "true")
+		err := os.Setenv("INT", "1")
+		So(err, ShouldBeNil)
+		err = os.Setenv("STRING", "test")
+		So(err, ShouldBeNil)
+		err = os.Setenv("EMPTYSTRING", "")
+		So(err, ShouldBeNil)
+		err = os.Setenv("BOOL", "true")
+		So(err, ShouldBeNil)
 
 		Convey("IntValue", func() {
 			type Data struct {
@@ -240,10 +244,14 @@ func TestValues(t *testing.T) {
 		})
 
 		Reset(func() {
-			os.Unsetenv("INT")
-			os.Unsetenv("STRING")
-			os.Unsetenv("EMPTYSTRING")
-			os.Unsetenv("BOOL")
+			err := os.Unsetenv("INT")
+			So(err, ShouldBeNil)
+			err = os.Unsetenv("STRING")
+			So(err, ShouldBeNil)
+			err = os.Unsetenv("EMPTYSTRING")
+			So(err, ShouldBeNil)
+			err = os.Unsetenv("BOOL")
+			So(err, ShouldBeNil)
 		})
 	})
 }

pkg/services/rendering/http_mode.go

@@ -77,7 +77,11 @@ func (rs *RenderingService) renderViaHttp(ctx context.Context, renderKey string,
 	}
 
 	// save response to file
-	defer resp.Body.Close()
+	defer func() {
+		if err := resp.Body.Close(); err != nil {
+			rs.log.Warn("Failed to close response body", "err", err)
+		}
+	}()
 
 	// check for timeout first
 	if errors.Is(reqContext.Err(), context.DeadlineExceeded) {

pkg/setting/dynamic_settings_test.go

@@ -15,8 +15,12 @@ func TestDynamicSettingsSupport_Override(t *testing.T) {
 	keyName := "bar"
 	expected := "dynamic value"
 
-	os.Setenv(envKey, expected)
-	defer func() { os.Unsetenv(envKey) }()
+	err := os.Setenv(envKey, expected)
+	require.NoError(t, err)
+	defer func() {
+		err := os.Unsetenv(envKey)
+		require.NoError(t, err)
+	}()
 
 	value := cfg.SectionWithEnvOverrides(sectionName).Key(keyName).MustString("default value")
 	require.Equal(t, expected, value)

pkg/setting/expanders_test.go

@@ -16,7 +16,8 @@ import (
 func TestExpandVar_EnvSuccessful(t *testing.T) {
 	const key = "GF_TEST_SETTING_EXPANDER_ENV"
 	const expected = "aurora borealis"
-	os.Setenv(key, expected)
+	err := os.Setenv(key, expected)
+	require.NoError(t, err)
 
 	// expanded format
 	{
@@ -39,12 +40,14 @@ func TestExpandVar_FileSuccessful(t *testing.T) {
 	file := f.Name()
 
 	defer func() {
-		os.Remove(file)
+		err := os.Remove(file)
+		require.NoError(t, err)
 	}()
 
 	_, err = f.WriteString("hello, world")
 	require.NoError(t, err)
-	f.Close()
+	err = f.Close()
+	require.NoError(t, err)
 
 	got, err := ExpandVar(fmt.Sprintf("$__file{%s}", file))
 	assert.NoError(t, err)

pkg/setting/setting_test.go

@@ -39,7 +39,10 @@ func TestLoadingSettings(t *testing.T) {
 			if err != nil {
 				t.Errorf("failed to load defaults.ini file: %v", err)
 			}
-			defer file.Close()
+			defer func() {
+				err := file.Close()
+				So(err, ShouldBeNil)
+			}()
 
 			scanner := bufio.NewScanner(file)
 			for scanner.Scan() {
@@ -51,10 +54,11 @@ func TestLoadingSettings(t *testing.T) {
 		})
 
 		Convey("Should be able to override via environment variables", func() {
-			os.Setenv("GF_SECURITY_ADMIN_USER", "superduper")
+			err := os.Setenv("GF_SECURITY_ADMIN_USER", "superduper")
+			require.NoError(t, err)
 
 			cfg := NewCfg()
-			err := cfg.Load(&CommandLineArgs{HomePath: "../../"})
+			err = cfg.Load(&CommandLineArgs{HomePath: "../../"})
 			So(err, ShouldBeNil)
 
 			So(AdminUser, ShouldEqual, "superduper")
@@ -63,29 +67,32 @@ func TestLoadingSettings(t *testing.T) {
 		})
 
 		Convey("Should replace password when defined in environment", func() {
-			os.Setenv("GF_SECURITY_ADMIN_PASSWORD", "supersecret")
+			err := os.Setenv("GF_SECURITY_ADMIN_PASSWORD", "supersecret")
+			require.NoError(t, err)
 
 			cfg := NewCfg()
-			err := cfg.Load(&CommandLineArgs{HomePath: "../../"})
+			err = cfg.Load(&CommandLineArgs{HomePath: "../../"})
 			So(err, ShouldBeNil)
 
 			So(appliedEnvOverrides, ShouldContain, "GF_SECURITY_ADMIN_PASSWORD=*********")
 		})
 
 		Convey("Should return an error when url is invalid", func() {
-			os.Setenv("GF_DATABASE_URL", "postgres.%31://grafana:secret@postgres:5432/grafana")
+			err := os.Setenv("GF_DATABASE_URL", "postgres.%31://grafana:secret@postgres:5432/grafana")
+			require.NoError(t, err)
 
 			cfg := NewCfg()
-			err := cfg.Load(&CommandLineArgs{HomePath: "../../"})
+			err = cfg.Load(&CommandLineArgs{HomePath: "../../"})
 
 			So(err, ShouldNotBeNil)
 		})
 
 		Convey("Should replace password in URL when url environment is defined", func() {
-			os.Setenv("GF_DATABASE_URL", "mysql://user:secret@localhost:3306/database")
+			err := os.Setenv("GF_DATABASE_URL", "mysql://user:secret@localhost:3306/database")
+			require.NoError(t, err)
 
 			cfg := NewCfg()
-			err := cfg.Load(&CommandLineArgs{HomePath: "../../"})
+			err = cfg.Load(&CommandLineArgs{HomePath: "../../"})
 			So(err, ShouldBeNil)
 
 			So(appliedEnvOverrides, ShouldContain, "GF_DATABASE_URL=mysql://user:-redacted-@localhost:3306/database")
@@ -186,9 +193,10 @@ func TestLoadingSettings(t *testing.T) {
 
 		Convey("Can use environment variables in config values", func() {
 			if runtime.GOOS == windows {
-				os.Setenv("GF_DATA_PATH", `c:\tmp\env_override`)
+				err := os.Setenv("GF_DATA_PATH", `c:\tmp\env_override`)
+				require.NoError(t, err)
 				cfg := NewCfg()
-				err := cfg.Load(&CommandLineArgs{
+				err = cfg.Load(&CommandLineArgs{
 					HomePath: "../../",
 					Args:     []string{"cfg:paths.data=${GF_DATA_PATH}"},
 				})
@@ -196,9 +204,10 @@ func TestLoadingSettings(t *testing.T) {
 
 				So(cfg.DataPath, ShouldEqual, `c:\tmp\env_override`)
 			} else {
-				os.Setenv("GF_DATA_PATH", "/tmp/env_override")
+				err := os.Setenv("GF_DATA_PATH", "/tmp/env_override")
+				require.NoError(t, err)
 				cfg := NewCfg()
-				err := cfg.Load(&CommandLineArgs{
+				err = cfg.Load(&CommandLineArgs{
 					HomePath: "../../",
 					Args:     []string{"cfg:paths.data=${GF_DATA_PATH}"},
 				})

pkg/tsdb/azuremonitor/applicationinsights-datasource.go

@@ -172,7 +172,11 @@ func (e *ApplicationInsightsDatasource) executeQuery(ctx context.Context, query
 	}
 
 	body, err := ioutil.ReadAll(res.Body)
-	defer res.Body.Close()
+	defer func() {
+		if err := res.Body.Close(); err != nil {
+			azlog.Warn("Failed to close response body", "err", err)
+		}
+	}()
 	if err != nil {
 		return nil, err
 	}

pkg/tsdb/azuremonitor/applicationinsights-metrics_test.go

@@ -156,8 +156,7 @@ func TestInsightsMetricsResultToFrame(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			res, err := loadInsightsMetricsResponse(tt.testFile)
-			require.NoError(t, err)
+			res := loadInsightsMetricsResponse(t, tt.testFile)
 
 			frame, err := InsightsMetricsResultToFrame(res, tt.metric, tt.agg, tt.dimensions)
 			require.NoError(t, err)
@@ -171,16 +170,23 @@ func TestInsightsMetricsResultToFrame(t *testing.T) {
 	}
 }
 
-func loadInsightsMetricsResponse(name string) (MetricsResult, error) {
-	var mr MetricsResult
+func loadInsightsMetricsResponse(t *testing.T, name string) MetricsResult {
+	t.Helper()
 
 	path := filepath.Join("testdata", name)
+	// Ignore gosec warning G304 since it's a test
+	// nolint:gosec
 	f, err := os.Open(path)
-	if err != nil {
-		return mr, err
-	}
-	defer f.Close()
+	require.NoError(t, err)
+	defer func() {
+		err := f.Close()
+		require.NoError(t, err)
+	}()
+
 	d := json.NewDecoder(f)
+	var mr MetricsResult
 	err = d.Decode(&mr)
-	return mr, err
+	require.NoError(t, err)
+
+	return mr
 }

pkg/tsdb/azuremonitor/azure-log-analytics-datasource.go

@@ -264,11 +264,14 @@ func (ar *AzureLogAnalyticsResponse) GetPrimaryResultTable() (*AzureLogAnalytics
 
 func (e *AzureLogAnalyticsDatasource) unmarshalResponse(res *http.Response) (AzureLogAnalyticsResponse, error) {
 	body, err := ioutil.ReadAll(res.Body)
-	defer res.Body.Close()
-
 	if err != nil {
 		return AzureLogAnalyticsResponse{}, err
 	}
+	defer func() {
+		if err := res.Body.Close(); err != nil {
+			azlog.Warn("Failed to close response body", "err", err)
+		}
+	}()
 
 	if res.StatusCode/100 != 2 {
 		azlog.Debug("Request failed", "status", res.Status, "body", string(body))

pkg/tsdb/azuremonitor/azure-log-analytics-table-frame_test.go

@@ -10,6 +10,7 @@ import (
 
 	"github.com/google/go-cmp/cmp"
 	"github.com/grafana/grafana-plugin-sdk-go/data"
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"github.com/xorcare/pointer"
 )
@@ -140,8 +141,7 @@ func TestLogTableToFrame(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			res, err := loadLogAnalyticsTestFileWithNumber(tt.testFile)
-			require.NoError(t, err)
+			res := loadLogAnalyticsTestFileWithNumber(t, tt.testFile)
 			frame, err := LogTableToFrame(&res.Tables[0])
 			require.NoError(t, err)
 
@@ -152,17 +152,22 @@ func TestLogTableToFrame(t *testing.T) {
 	}
 }
 
-func loadLogAnalyticsTestFileWithNumber(name string) (AzureLogAnalyticsResponse, error) {
-	var data AzureLogAnalyticsResponse
-
+func loadLogAnalyticsTestFileWithNumber(t *testing.T, name string) AzureLogAnalyticsResponse {
+	t.Helper()
 	path := filepath.Join("testdata", name)
+	// Ignore gosec warning G304 since it's a test
+	// nolint:gosec
 	f, err := os.Open(path)
-	if err != nil {
-		return data, err
-	}
-	defer f.Close()
+	require.NoError(t, err)
+	defer func() {
+		err := f.Close()
+		assert.NoError(t, err)
+	}()
+
 	d := json.NewDecoder(f)
 	d.UseNumber()
+	var data AzureLogAnalyticsResponse
 	err = d.Decode(&data)
-	return data, err
+	require.NoError(t, err)
+	return data
 }

pkg/tsdb/azuremonitor/azuremonitor-datasource.go

@@ -206,6 +206,11 @@ func (e *AzureMonitorDatasource) executeQuery(ctx context.Context, query *AzureM
 		queryResult.Error = err
 		return queryResult, AzureMonitorResponse{}, nil
 	}
+	defer func() {
+		if err := res.Body.Close(); err != nil {
+			azlog.Warn("Failed to close response body", "err", err)
+		}
+	}()
 
 	data, err := e.unmarshalResponse(res)
 	if err != nil {
@@ -256,7 +261,6 @@ func (e *AzureMonitorDatasource) createRequest(ctx context.Context, dsInfo *mode
 
 func (e *AzureMonitorDatasource) unmarshalResponse(res *http.Response) (AzureMonitorResponse, error) {
 	body, err := ioutil.ReadAll(res.Body)
-	defer res.Body.Close()
 	if err != nil {
 		return AzureMonitorResponse{}, err
 	}

pkg/tsdb/azuremonitor/azuremonitor-datasource_test.go

@@ -433,10 +433,9 @@ func TestAzureMonitorParseResponse(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			azData, err := loadTestFile("azuremonitor/" + tt.responseFile)
-			require.NoError(t, err)
+			azData := loadTestFile(t, "azuremonitor/"+tt.responseFile)
 			res := &tsdb.QueryResult{Meta: simplejson.New(), RefId: "A"}
-			err = datasource.parseResponse(res, azData, tt.mockQuery)
+			err := datasource.parseResponse(res, azData, tt.mockQuery)
 			require.NoError(t, err)
 
 			frames, err := res.Dataframes.Decoded()
@@ -496,14 +495,17 @@ func TestFindClosestAllowIntervalMS(t *testing.T) {
 	}
 }
 
-func loadTestFile(name string) (AzureMonitorResponse, error) {
-	var azData AzureMonitorResponse
+func loadTestFile(t *testing.T, name string) AzureMonitorResponse {
+	t.Helper()
 
 	path := filepath.Join("testdata", name)
+	// Ignore gosec warning G304 since it's a test
+	// nolint:gosec
 	jsonBody, err := ioutil.ReadFile(path)
-	if err != nil {
-		return azData, err
-	}
+	require.NoError(t, err)
+
+	var azData AzureMonitorResponse
 	err = json.Unmarshal(jsonBody, &azData)
-	return azData, err
+	require.NoError(t, err)
+	return azData
 }

pkg/tsdb/azuremonitor/insights-analytics-datasource.go

@@ -132,10 +132,14 @@ func (e *InsightsAnalyticsDatasource) executeQuery(ctx context.Context, query *I
 	}
 
 	body, err := ioutil.ReadAll(res.Body)
-	defer res.Body.Close()
 	if err != nil {
 		return queryResultError(err)
 	}
+	defer func() {
+		if err := res.Body.Close(); err != nil {
+			azlog.Warn("Failed to close response body", "err", err)
+		}
+	}()
 
 	if res.StatusCode/100 != 2 {
 		azlog.Debug("Request failed", "status", res.Status, "body", string(body))

pkg/tsdb/cloudmonitoring/cloudmonitoring.go

@@ -482,10 +482,14 @@ func (e *CloudMonitoringExecutor) executeQuery(ctx context.Context, query *cloud
 
 func (e *CloudMonitoringExecutor) unmarshalResponse(res *http.Response) (cloudMonitoringResponse, error) {
 	body, err := ioutil.ReadAll(res.Body)
-	defer res.Body.Close()
 	if err != nil {
 		return cloudMonitoringResponse{}, err
 	}
+	defer func() {
+		if err := res.Body.Close(); err != nil {
+			slog.Warn("Failed to close response body", "err", err)
+		}
+	}()
 
 	if res.StatusCode/100 != 2 {
 		slog.Error("Request failed", "status", res.Status, "body", string(body))

pkg/tsdb/cloudmonitoring/cloudmonitoring_test.go

@@ -989,6 +989,8 @@ func TestCloudMonitoring(t *testing.T) {
 func loadTestFile(path string) (cloudMonitoringResponse, error) {
 	var data cloudMonitoringResponse
 
+	// Can ignore gosec warning G304 here since it's a test path
+	// nolint:gosec
 	jsonBody, err := ioutil.ReadFile(path)
 	if err != nil {
 		return data, err

pkg/tsdb/elasticsearch/client/client.go

@@ -226,7 +226,11 @@ func (c *baseClientImpl) ExecuteMultisearch(r *MultiSearchRequest) (*MultiSearch
 		return nil, err
 	}
 	res := clientRes.httpResponse
-	defer res.Body.Close()
+	defer func() {
+		if err := res.Body.Close(); err != nil {
+			clientLog.Warn("Failed to close response body", "err", err)
+		}
+	}()
 
 	clientLog.Debug("Received multisearch response", "code", res.StatusCode, "status", res.Status, "content-length", res.ContentLength)
 

pkg/tsdb/graphite/graphite.go

@@ -133,10 +133,14 @@ func (e *GraphiteExecutor) Query(ctx context.Context, dsInfo *models.DataSource,
 
 func (e *GraphiteExecutor) parseResponse(res *http.Response) ([]TargetResponseDTO, error) {
 	body, err := ioutil.ReadAll(res.Body)
-	defer res.Body.Close()
 	if err != nil {
 		return nil, err
 	}
+	defer func() {
+		if err := res.Body.Close(); err != nil {
+			glog.Warn("Failed to close response body", "err", err)
+		}
+	}()
 
 	if res.StatusCode/100 != 2 {
 		glog.Info("Request failed", "status", res.Status, "body", string(body))

pkg/tsdb/influxdb/influxdb.go

@@ -82,10 +82,13 @@ func (e *InfluxDBExecutor) Query(ctx context.Context, dsInfo *models.DataSource,
 	if err != nil {
 		return nil, err
 	}
-
-	defer resp.Body.Close()
+	defer func() {
+		if err := resp.Body.Close(); err != nil {
+			glog.Warn("Failed to close response body", "err", err)
+		}
+	}()
 	if resp.StatusCode/100 != 2 {
-		return nil, fmt.Errorf("InfluxDB returned statuscode invalid status code: %s", resp.Status)
+		return nil, fmt.Errorf("InfluxDB returned error status: %s", resp.Status)
 	}
 
 	var response Response

pkg/tsdb/opentsdb/opentsdb.go

@@ -110,10 +110,14 @@ func (e *OpenTsdbExecutor) parseResponse(query OpenTsdbQuery, res *http.Response
 	queryRes := tsdb.NewQueryResult()
 
 	body, err := ioutil.ReadAll(res.Body)
-	defer res.Body.Close()
 	if err != nil {
 		return nil, err
 	}
+	defer func() {
+		if err := res.Body.Close(); err != nil {
+			plog.Warn("Failed to close response body", "err", err)
+		}
+	}()
 
 	if res.StatusCode/100 != 2 {
 		plog.Info("Request failed", "status", res.Status, "body", string(body))

pkg/tsdb/sqleng/sql_engine.go

@@ -173,8 +173,11 @@ func (e *sqlQueryEndpoint) Query(ctx context.Context, dsInfo *models.DataSource,
 				queryResult.Error = e.queryResultTransformer.TransformQueryError(err)
 				return
 			}
-
-			defer rows.Close()
+			defer func() {
+				if err := rows.Close(); err != nil {
+					e.log.Warn("Failed to close rows", "err", err)
+				}
+			}()
 
 			format := query.Model.Get("format").MustString("time_series")
 

scripts/go/configs/.golangci.toml

@@ -57,6 +57,9 @@ enable = [
 # Disabled linters (might want them later)
 # "unparam"
 
+[issues]
+exclude-use-default = false
+
 # Enable when appropriate
 # Poorly chosen identifier
 [[issues.exclude-rules]]
@@ -112,3 +115,18 @@ text = "Unknwon` is a misspelling of `Unknown"
 [[issues.exclude-rules]]
 linters = ["errorlint"]
 text = "non-wrapping format verb for fmt.Errorf"
+
+# TODO: Enable
+[[issues.exclude-rules]]
+linters = ["stylecheck"]
+text = "ST1000"
+
+# TODO: Enable
+[[issues.exclude-rules]]
+linters = ["stylecheck"]
+text = "ST1020"
+
+# TODO: Enable
+[[issues.exclude-rules]]
+linters = ["stylecheck"]
+text = "ST1021"