chore: update linter.

.golangci.toml

@@ -52,6 +52,8 @@
     "testpackage", # Too strict
     "goerr113", # Too strict
     "nestif", # Too many false-positive.
+    "noctx", # Too strict
+    "exhaustive", # Too strict
   ]
 
 [issues]

build.Dockerfile

@@ -19,7 +19,7 @@ RUN mkdir -p /usr/local/bin \
     && chmod +x /usr/local/bin/go-bindata
 
 # Download golangci-lint binary to bin folder in $GOPATH
-RUN curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s -- -b $GOPATH/bin v1.26.0
+RUN curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s -- -b $GOPATH/bin v1.28.0
 
 # Download misspell binary to bin folder in $GOPATH
 RUN  curl -sfL https://raw.githubusercontent.com/client9/misspell/master/install-misspell.sh | bash -s -- -b $GOPATH/bin v0.3.4

cmd/traefik/traefik.go

@@ -403,7 +403,7 @@ func configureLogging(staticConfiguration *static.Configuration) {
 	if len(logFile) > 0 {
 		dir := filepath.Dir(logFile)
 
-		if err := os.MkdirAll(dir, 0755); err != nil {
+		if err := os.MkdirAll(dir, 0o755); err != nil {
 			log.WithoutContext().Errorf("Failed to create log path %s: %s", dir, err)
 		}
 

integration/consul_test.go

@@ -138,7 +138,7 @@ func (s *ConsulSuite) TestSimpleConfiguration(c *check.C) {
 	expectedJSON := filepath.FromSlash("testdata/rawdata-consul.json")
 
 	if *updateExpected {
-		err = ioutil.WriteFile(expectedJSON, got, 0666)
+		err = ioutil.WriteFile(expectedJSON, got, 0o666)
 		c.Assert(err, checker.IsNil)
 	}
 

integration/docker_compose_test.go

@@ -36,8 +36,8 @@ func (s *DockerComposeSuite) TearDownSuite(c *check.C) {
 }
 
 func (s *DockerComposeSuite) TestComposeScale(c *check.C) {
-	var serviceCount = 2
+	serviceCount := 2
-	var composeService = "whoami1"
+	composeService := "whoami1"
 
 	s.composeProject.Scale(c, composeService, serviceCount)
 

integration/docker_test.go

@@ -43,7 +43,7 @@ func (s *DockerSuite) startContainerWithLabels(c *check.C, image string, labels
 	})
 }
 
-func (s *DockerSuite) startContainerWithNameAndLabels(c *check.C, name string, image string, labels map[string]string, args ...string) string {
+func (s *DockerSuite) startContainerWithNameAndLabels(c *check.C, name, image string, labels map[string]string, args ...string) string {
 	return s.startContainerWithConfig(c, image, d.ContainerConfig{
 		Name:   name,
 		Cmd:    args,

integration/etcd_test.go

@@ -138,7 +138,7 @@ func (s *EtcdSuite) TestSimpleConfiguration(c *check.C) {
 	expectedJSON := filepath.FromSlash("testdata/rawdata-etcd.json")
 
 	if *updateExpected {
-		err = ioutil.WriteFile(expectedJSON, got, 0666)
+		err = ioutil.WriteFile(expectedJSON, got, 0o666)
 		c.Assert(err, checker.IsNil)
 	}
 

integration/grpc_test.go

@@ -19,8 +19,10 @@ import (
 	"google.golang.org/grpc/credentials"
 )
 
-var LocalhostCert []byte
+var (
-var LocalhostKey []byte
+	LocalhostCert []byte
+	LocalhostKey  []byte
+)
 
 const randCharset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"
 

integration/helloworld/helloworld.pb.go

@@ -15,9 +15,11 @@ It has these top-level messages:
 */
 package helloworld
 
-import proto "github.com/golang/protobuf/proto"
+import (
-import fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
-import math "math"
+	fmt "fmt"
+	math "math"
+)
 
 import (
 	context "context"
@@ -26,9 +28,11 @@ import (
 )
 
 // Reference imports to suppress errors if they are not otherwise used.
-var _ = proto.Marshal
+var (
-var _ = fmt.Errorf
+	_ = proto.Marshal
-var _ = math.Inf
+	_ = fmt.Errorf
+	_ = math.Inf
+)
 
 // This is a compile-time assertion to ensure that this generated file
 // is compatible with the proto package it is being compiled against.
@@ -102,8 +106,10 @@ func init() {
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
-var _ context.Context
+var (
-var _ grpc.ClientConn
+	_ context.Context
+	_ grpc.ClientConn
+)
 
 // This is a compile-time assertion to ensure that this generated file
 // is compatible with the grpc package it is being compiled against.

integration/https_test.go

@@ -956,11 +956,13 @@ func modifyCertificateConfFileContent(c *check.C, certFileName, confFileName str
 	if len(certFileName) > 0 {
 		tlsConf := dynamic.Configuration{
 			TLS: &dynamic.TLSConfiguration{
-				Certificates: []*traefiktls.CertAndStores{{
+				Certificates: []*traefiktls.CertAndStores{
-					Certificate: traefiktls.Certificate{
+					{
-						CertFile: traefiktls.FileOrContent("fixtures/https/" + certFileName + ".cert"),
+						Certificate: traefiktls.Certificate{
-						KeyFile:  traefiktls.FileOrContent("fixtures/https/" + certFileName + ".key"),
+							CertFile: traefiktls.FileOrContent("fixtures/https/" + certFileName + ".cert"),
-					}},
+							KeyFile:  traefiktls.FileOrContent("fixtures/https/" + certFileName + ".key"),
+						},
+					},
 				},
 			},
 		}

integration/integration_test.go

@@ -21,10 +21,12 @@ import (
 	checker "github.com/vdemeester/shakers"
 )
 
-var integration = flag.Bool("integration", false, "run integration tests")
+var (
-var container = flag.Bool("container", false, "run container integration tests")
+	integration = flag.Bool("integration", false, "run integration tests")
-var host = flag.Bool("host", false, "run host integration tests")
+	container   = flag.Bool("container", false, "run container integration tests")
-var showLog = flag.Bool("tlog", false, "always show Traefik logs")
+	host        = flag.Bool("host", false, "run host integration tests")
+	showLog     = flag.Bool("tlog", false, "always show Traefik logs")
+)
 
 func Test(t *testing.T) {
 	if !*integration {

integration/k8s_test.go

@@ -119,7 +119,7 @@ func testConfiguration(c *check.C, path, apiPort string) {
 	newJSON, err := json.MarshalIndent(rtRepr, "", "\t")
 	c.Assert(err, checker.IsNil)
 
-	err = ioutil.WriteFile(expectedJSON, newJSON, 0644)
+	err = ioutil.WriteFile(expectedJSON, newJSON, 0o644)
 	c.Assert(err, checker.IsNil)
 	c.Errorf("We do not want a passing test in file update mode")
 }

integration/marathon15_test.go

@@ -55,7 +55,7 @@ func (s *MarathonSuite15) extendDockerHostsFile(host, ipAddr string) error {
 	// (See also https://groups.google.com/d/topic/docker-user/JOGE7AnJ3Gw/discussion.)
 	if os.Getenv("CONTAINER") == "DOCKER" {
 		// We are running inside a container -- extend the hosts file.
-		file, err := os.OpenFile(hostsFile, os.O_APPEND|os.O_WRONLY, 0600)
+		file, err := os.OpenFile(hostsFile, os.O_APPEND|os.O_WRONLY, 0o600)
 		if err != nil {
 			return err
 		}

integration/marathon_test.go

@@ -60,7 +60,7 @@ func (s *MarathonSuite) extendDockerHostsFile(host, ipAddr string) error {
 	// (See also https://groups.google.com/d/topic/docker-user/JOGE7AnJ3Gw/discussion.)
 	if os.Getenv("CONTAINER") == "DOCKER" {
 		// We are running inside a container -- extend the hosts file.
-		file, err := os.OpenFile(hostsFile, os.O_APPEND|os.O_WRONLY, 0600)
+		file, err := os.OpenFile(hostsFile, os.O_APPEND|os.O_WRONLY, 0o600)
 		if err != nil {
 			return err
 		}

integration/redis_test.go

@@ -138,7 +138,7 @@ func (s *RedisSuite) TestSimpleConfiguration(c *check.C) {
 	expectedJSON := filepath.FromSlash("testdata/rawdata-redis.json")
 
 	if *updateExpected {
-		err = ioutil.WriteFile(expectedJSON, got, 0666)
+		err = ioutil.WriteFile(expectedJSON, got, 0o666)
 		c.Assert(err, checker.IsNil)
 	}
 

integration/websocket_test.go

@@ -22,7 +22,7 @@ import (
 type WebsocketSuite struct{ BaseSuite }
 
 func (s *WebsocketSuite) TestBase(c *check.C) {
-	var upgrader = gorillawebsocket.Upgrader{} // use default options
+	upgrader := gorillawebsocket.Upgrader{} // use default options
 
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		c, err := upgrader.Upgrade(w, r, nil)
@@ -72,7 +72,7 @@ func (s *WebsocketSuite) TestBase(c *check.C) {
 }
 
 func (s *WebsocketSuite) TestWrongOrigin(c *check.C) {
-	var upgrader = gorillawebsocket.Upgrader{} // use default options
+	upgrader := gorillawebsocket.Upgrader{} // use default options
 
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		c, err := upgrader.Upgrade(w, r, nil)
@@ -122,7 +122,7 @@ func (s *WebsocketSuite) TestWrongOrigin(c *check.C) {
 
 func (s *WebsocketSuite) TestOrigin(c *check.C) {
 	// use default options
-	var upgrader = gorillawebsocket.Upgrader{}
+	upgrader := gorillawebsocket.Upgrader{}
 
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		c, err := upgrader.Upgrade(w, r, nil)
@@ -180,7 +180,7 @@ func (s *WebsocketSuite) TestOrigin(c *check.C) {
 }
 
 func (s *WebsocketSuite) TestWrongOriginIgnoredByServer(c *check.C) {
-	var upgrader = gorillawebsocket.Upgrader{CheckOrigin: func(r *http.Request) bool {
+	upgrader := gorillawebsocket.Upgrader{CheckOrigin: func(r *http.Request) bool {
 		return true
 	}}
 
@@ -240,7 +240,7 @@ func (s *WebsocketSuite) TestWrongOriginIgnoredByServer(c *check.C) {
 }
 
 func (s *WebsocketSuite) TestSSLTermination(c *check.C) {
-	var upgrader = gorillawebsocket.Upgrader{} // use default options
+	upgrader := gorillawebsocket.Upgrader{} // use default options
 
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		c, err := upgrader.Upgrade(w, r, nil)
@@ -297,11 +297,10 @@ func (s *WebsocketSuite) TestSSLTermination(c *check.C) {
 }
 
 func (s *WebsocketSuite) TestBasicAuth(c *check.C) {
-	var upgrader = gorillawebsocket.Upgrader{} // use default options
+	upgrader := gorillawebsocket.Upgrader{} // use default options
 
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		conn, err := upgrader.Upgrade(w, r, nil)
-
 		if err != nil {
 			return
 		}
@@ -390,7 +389,7 @@ func (s *WebsocketSuite) TestSpecificResponseFromBackend(c *check.C) {
 }
 
 func (s *WebsocketSuite) TestURLWithURLEncodedChar(c *check.C) {
-	var upgrader = gorillawebsocket.Upgrader{} // use default options
+	upgrader := gorillawebsocket.Upgrader{} // use default options
 
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		c.Assert(r.URL.EscapedPath(), check.Equals, "/ws/http%3A%2F%2Ftest")
@@ -441,7 +440,7 @@ func (s *WebsocketSuite) TestURLWithURLEncodedChar(c *check.C) {
 }
 
 func (s *WebsocketSuite) TestSSLhttp2(c *check.C) {
-	var upgrader = gorillawebsocket.Upgrader{} // use default options
+	upgrader := gorillawebsocket.Upgrader{} // use default options
 
 	ts := httptest.NewUnstartedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		c, err := upgrader.Upgrade(w, r, nil)
@@ -504,7 +503,7 @@ func (s *WebsocketSuite) TestSSLhttp2(c *check.C) {
 }
 
 func (s *WebsocketSuite) TestHeaderAreForwared(c *check.C) {
-	var upgrader = gorillawebsocket.Upgrader{} // use default options
+	upgrader := gorillawebsocket.Upgrader{} // use default options
 
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		c.Assert(r.Header.Get("X-Token"), check.Equals, "my-token")

integration/zk_test.go

@@ -138,7 +138,7 @@ func (s *ZookeeperSuite) TestSimpleConfiguration(c *check.C) {
 	expectedJSON := filepath.FromSlash("testdata/rawdata-zk.json")
 
 	if *updateExpected {
-		err = ioutil.WriteFile(expectedJSON, got, 0666)
+		err = ioutil.WriteFile(expectedJSON, got, 0o666)
 		c.Assert(err, checker.IsNil)
 	}
 

internal/gendoc.go

@@ -24,7 +24,7 @@ func main() {
 	genKVDynConfDoc("./docs/content/reference/dynamic-configuration/kv-ref.md")
 }
 
-func genStaticConfDoc(outputFile string, prefix string, encodeFn func(interface{}) ([]parser.Flat, error)) {
+func genStaticConfDoc(outputFile, prefix string, encodeFn func(interface{}) ([]parser.Flat, error)) {
 	logger := log.WithoutContext().WithField("file", outputFile)
 
 	element := &static.Configuration{}
@@ -41,7 +41,7 @@ func genStaticConfDoc(outputFile string, prefix string, encodeFn func(interface{
 		logger.Fatal(err)
 	}
 
-	file, err := os.OpenFile(outputFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0666)
+	file, err := os.OpenFile(outputFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0o666)
 	if err != nil {
 		logger.Fatal(err)
 	}

pkg/anonymize/anonymize_doOnStruct_test.go

@@ -11,6 +11,7 @@ type Courgette struct {
 	Ji string
 	Ho string
 }
+
 type Tomate struct {
 	Ji string
 	Ho string

pkg/api/handler_entrypoint_test.go

@@ -226,7 +226,7 @@ func TestHandler_EntryPoints(t *testing.T) {
 				newJSON, err := json.MarshalIndent(results, "", "\t")
 				require.NoError(t, err)
 
-				err = ioutil.WriteFile(test.expected.jsonFile, newJSON, 0644)
+				err = ioutil.WriteFile(test.expected.jsonFile, newJSON, 0o644)
 				require.NoError(t, err)
 			}
 

pkg/api/handler_http_test.go

@@ -840,7 +840,7 @@ func TestHandler_HTTP(t *testing.T) {
 				newJSON, err := json.MarshalIndent(results, "", "\t")
 				require.NoError(t, err)
 
-				err = ioutil.WriteFile(test.expected.jsonFile, newJSON, 0644)
+				err = ioutil.WriteFile(test.expected.jsonFile, newJSON, 0o644)
 				require.NoError(t, err)
 			}
 

pkg/api/handler_overview_test.go

@@ -277,7 +277,7 @@ func TestHandler_Overview(t *testing.T) {
 				newJSON, err := json.MarshalIndent(results, "", "\t")
 				require.NoError(t, err)
 
-				err = ioutil.WriteFile(test.expected.jsonFile, newJSON, 0644)
+				err = ioutil.WriteFile(test.expected.jsonFile, newJSON, 0o644)
 				require.NoError(t, err)
 			}
 

pkg/api/handler_tcp_test.go

@@ -548,7 +548,7 @@ func TestHandler_TCP(t *testing.T) {
 				newJSON, err := json.MarshalIndent(results, "", "\t")
 				require.NoError(t, err)
 
-				err = ioutil.WriteFile(test.expected.jsonFile, newJSON, 0644)
+				err = ioutil.WriteFile(test.expected.jsonFile, newJSON, 0o644)
 				require.NoError(t, err)
 			}
 

pkg/api/handler_test.go

@@ -161,7 +161,7 @@ func TestHandler_RawData(t *testing.T) {
 				newJSON, err := json.MarshalIndent(rtRepr, "", "\t")
 				require.NoError(t, err)
 
-				err = ioutil.WriteFile(test.expected.json, newJSON, 0644)
+				err = ioutil.WriteFile(test.expected.json, newJSON, 0o644)
 				require.NoError(t, err)
 			}
 

pkg/api/handler_udp_test.go

@@ -525,7 +525,7 @@ func TestHandler_UDP(t *testing.T) {
 				newJSON, err := json.MarshalIndent(results, "", "\t")
 				require.NoError(t, err)
 
-				err = ioutil.WriteFile(test.expected.jsonFile, newJSON, 0644)
+				err = ioutil.WriteFile(test.expected.jsonFile, newJSON, 0o644)
 				require.NoError(t, err)
 			}
 

pkg/config/file/file_node_test.go

@@ -100,25 +100,34 @@ func Test_decodeFileToNode_Toml(t *testing.T) {
 						{Name: "defaultMode", Value: "foobar"},
 						{Name: "names", Children: []*parser.Node{
 							{Name: "name0", Value: "foobar"},
-							{Name: "name1", Value: "foobar"}}}}},
+							{Name: "name1", Value: "foobar"},
+						}},
+					}},
 					{Name: "names", Children: []*parser.Node{
 						{Name: "name0", Value: "foobar"},
-						{Name: "name1", Value: "foobar"}}}}},
+						{Name: "name1", Value: "foobar"},
+					}},
+				}},
 				{Name: "filePath", Value: "foobar"},
 				{Name: "filters", Children: []*parser.Node{
 					{Name: "minDuration", Value: "42"},
 					{Name: "retryAttempts", Value: "true"},
-					{Name: "statusCodes", Value: "foobar,foobar"}}},
+					{Name: "statusCodes", Value: "foobar,foobar"},
-				{Name: "format", Value: "foobar"}}},
+				}},
+				{Name: "format", Value: "foobar"},
+			}},
 			{Name: "api", Children: []*parser.Node{
 				{Name: "dashboard", Value: "true"},
 				{Name: "entryPoint", Value: "foobar"},
 				{Name: "middlewares", Value: "foobar,foobar"},
 				{Name: "statistics", Children: []*parser.Node{
-					{Name: "recentErrors", Value: "42"}}}}},
+					{Name: "recentErrors", Value: "42"},
+				}},
+			}},
 			{Name: "certificatesResolvers", Children: []*parser.Node{
 				{Name: "default", Children: []*parser.Node{
-					{Name: "acme",
+					{
+						Name: "acme",
 						Children: []*parser.Node{
 							{Name: "acmeLogging", Value: "true"},
 							{Name: "caServer", Value: "foobar"},
@@ -131,7 +140,8 @@ func Test_decodeFileToNode_Toml(t *testing.T) {
 							{Name: "email", Value: "foobar"},
 							{Name: "entryPoint", Value: "foobar"},
 							{Name: "httpChallenge", Children: []*parser.Node{
-								{Name: "entryPoint", Value: "foobar"}}},
+								{Name: "entryPoint", Value: "foobar"},
+							}},
 							{Name: "keyType", Value: "foobar"},
 							{Name: "storage", Value: "foobar"},
 							{Name: "tlsChallenge"},
@@ -144,33 +154,44 @@ func Test_decodeFileToNode_Toml(t *testing.T) {
 					{Name: "address", Value: "foobar"},
 					{Name: "forwardedHeaders", Children: []*parser.Node{
 						{Name: "insecure", Value: "true"},
-						{Name: "trustedIPs", Value: "foobar,foobar"}}},
+						{Name: "trustedIPs", Value: "foobar,foobar"},
+					}},
 					{Name: "proxyProtocol", Children: []*parser.Node{
 						{Name: "insecure", Value: "true"},
-						{Name: "trustedIPs", Value: "foobar,foobar"}}},
+						{Name: "trustedIPs", Value: "foobar,foobar"},
+					}},
 					{Name: "transport", Children: []*parser.Node{
 						{Name: "lifeCycle", Children: []*parser.Node{
 							{Name: "graceTimeOut", Value: "42"},
-							{Name: "requestAcceptGraceTimeout", Value: "42"}}},
+							{Name: "requestAcceptGraceTimeout", Value: "42"},
+						}},
 						{Name: "respondingTimeouts", Children: []*parser.Node{
 							{Name: "idleTimeout", Value: "42"},
 							{Name: "readTimeout", Value: "42"},
-							{Name: "writeTimeout", Value: "42"}}}}}}}}},
+							{Name: "writeTimeout", Value: "42"},
+						}},
+					}},
+				}},
+			}},
 			{Name: "global", Children: []*parser.Node{
 				{Name: "checkNewVersion", Value: "true"},
-				{Name: "sendAnonymousUsage", Value: "true"}}},
+				{Name: "sendAnonymousUsage", Value: "true"},
+			}},
 			{Name: "hostResolver", Children: []*parser.Node{
 				{Name: "cnameFlattening", Value: "true"},
 				{Name: "resolvConfig", Value: "foobar"},
-				{Name: "resolvDepth", Value: "42"}}},
+				{Name: "resolvDepth", Value: "42"},
+			}},
 			{Name: "log", Children: []*parser.Node{
 				{Name: "filePath", Value: "foobar"},
 				{Name: "format", Value: "foobar"},
-				{Name: "level", Value: "foobar"}}},
+				{Name: "level", Value: "foobar"},
+			}},
 			{Name: "metrics", Children: []*parser.Node{
 				{Name: "datadog", Children: []*parser.Node{
 					{Name: "address", Value: "foobar"},
-					{Name: "pushInterval", Value: "10s"}}},
+					{Name: "pushInterval", Value: "10s"},
+				}},
 				{Name: "influxDB", Children: []*parser.Node{
 					{Name: "address", Value: "foobar"},
 					{Name: "database", Value: "foobar"},
@@ -178,17 +199,22 @@ func Test_decodeFileToNode_Toml(t *testing.T) {
 					{Name: "protocol", Value: "foobar"},
 					{Name: "pushInterval", Value: "10s"},
 					{Name: "retentionPolicy", Value: "foobar"},
-					{Name: "username", Value: "foobar"}}},
+					{Name: "username", Value: "foobar"},
+				}},
 				{Name: "prometheus", Children: []*parser.Node{
 					{Name: "buckets", Value: "42,42"},
 					{Name: "entryPoint", Value: "foobar"},
-					{Name: "middlewares", Value: "foobar,foobar"}}},
+					{Name: "middlewares", Value: "foobar,foobar"},
+				}},
 				{Name: "statsD", Children: []*parser.Node{
 					{Name: "address", Value: "foobar"},
-					{Name: "pushInterval", Value: "10s"}}}}},
+					{Name: "pushInterval", Value: "10s"},
+				}},
+			}},
 			{Name: "ping", Children: []*parser.Node{
 				{Name: "entryPoint", Value: "foobar"},
-				{Name: "middlewares", Value: "foobar,foobar"}}},
+				{Name: "middlewares", Value: "foobar,foobar"},
+			}},
 			{Name: "providers", Children: []*parser.Node{
 				{Name: "docker", Children: []*parser.Node{
 					{Name: "constraints", Value: "foobar"},
@@ -203,15 +229,19 @@ func Test_decodeFileToNode_Toml(t *testing.T) {
 						{Name: "caOptional", Value: "true"},
 						{Name: "cert", Value: "foobar"},
 						{Name: "insecureSkipVerify", Value: "true"},
-						{Name: "key", Value: "foobar"}}},
+						{Name: "key", Value: "foobar"},
+					}},
 					{Name: "useBindPortIP", Value: "true"},
-					{Name: "watch", Value: "true"}}},
+					{Name: "watch", Value: "true"},
+				}},
 				{Name: "file", Children: []*parser.Node{
 					{Name: "debugLogGeneratedTemplate", Value: "true"},
 					{Name: "directory", Value: "foobar"},
 					{Name: "filename", Value: "foobar"},
-					{Name: "watch", Value: "true"}}},
+					{Name: "watch", Value: "true"},
-				{Name: "kubernetesCRD",
+				}},
+				{
+					Name: "kubernetesCRD",
 					Children: []*parser.Node{
 						{Name: "certAuthFilePath", Value: "foobar"},
 						{Name: "disablePassHostHeaders", Value: "true"},
@@ -219,7 +249,9 @@ func Test_decodeFileToNode_Toml(t *testing.T) {
 						{Name: "ingressClass", Value: "foobar"},
 						{Name: "labelSelector", Value: "foobar"},
 						{Name: "namespaces", Value: "foobar,foobar"},
-						{Name: "token", Value: "foobar"}}},
+						{Name: "token", Value: "foobar"},
+					},
+				},
 				{Name: "kubernetesIngress", Children: []*parser.Node{
 					{Name: "certAuthFilePath", Value: "foobar"},
 					{Name: "disablePassHostHeaders", Value: "true"},
@@ -228,14 +260,17 @@ func Test_decodeFileToNode_Toml(t *testing.T) {
 					{Name: "ingressEndpoint", Children: []*parser.Node{
 						{Name: "hostname", Value: "foobar"},
 						{Name: "ip", Value: "foobar"},
-						{Name: "publishedService", Value: "foobar"}}},
+						{Name: "publishedService", Value: "foobar"},
+					}},
 					{Name: "labelSelector", Value: "foobar"},
 					{Name: "namespaces", Value: "foobar,foobar"},
-					{Name: "token", Value: "foobar"}}},
+					{Name: "token", Value: "foobar"},
+				}},
 				{Name: "marathon", Children: []*parser.Node{
 					{Name: "basic", Children: []*parser.Node{
 						{Name: "httpBasicAuthUser", Value: "foobar"},
-						{Name: "httpBasicPassword", Value: "foobar"}}},
+						{Name: "httpBasicPassword", Value: "foobar"},
+					}},
 					{Name: "constraints", Value: "foobar"},
 					{Name: "dcosToken", Value: "foobar"},
 					{Name: "defaultRule", Value: "foobar"},
@@ -251,10 +286,12 @@ func Test_decodeFileToNode_Toml(t *testing.T) {
 						{Name: "caOptional", Value: "true"},
 						{Name: "cert", Value: "foobar"},
 						{Name: "insecureSkipVerify", Value: "true"},
-						{Name: "key", Value: "foobar"}}},
+						{Name: "key", Value: "foobar"},
+					}},
 					{Name: "tlsHandshakeTimeout", Value: "42"},
 					{Name: "trace", Value: "true"},
-					{Name: "watch", Value: "true"}}},
+					{Name: "watch", Value: "true"},
+				}},
 				{Name: "providersThrottleDuration", Value: "42"},
 				{Name: "rancher", Children: []*parser.Node{
 					{Name: "constraints", Value: "foobar"},
@@ -264,17 +301,22 @@ func Test_decodeFileToNode_Toml(t *testing.T) {
 					{Name: "intervalPoll", Value: "true"},
 					{Name: "prefix", Value: "foobar"},
 					{Name: "refreshSeconds", Value: "42"},
-					{Name: "watch", Value: "true"}}},
+					{Name: "watch", Value: "true"},
+				}},
 				{Name: "rest", Children: []*parser.Node{
-					{Name: "entryPoint", Value: "foobar"}}}}},
+					{Name: "entryPoint", Value: "foobar"},
+				}},
+			}},
 			{Name: "serversTransport", Children: []*parser.Node{
 				{Name: "forwardingTimeouts", Children: []*parser.Node{
 					{Name: "dialTimeout", Value: "42"},
 					{Name: "idleConnTimeout", Value: "42"},
-					{Name: "responseHeaderTimeout", Value: "42"}}},
+					{Name: "responseHeaderTimeout", Value: "42"},
+				}},
 				{Name: "insecureSkipVerify", Value: "true"},
 				{Name: "maxIdleConnsPerHost", Value: "42"},
-				{Name: "rootCAs", Value: "foobar,foobar"}}},
+				{Name: "rootCAs", Value: "foobar,foobar"},
+			}},
 			{Name: "tracing", Children: []*parser.Node{
 				{Name: "datadog", Children: []*parser.Node{
 					{Name: "bagagePrefixHeaderName", Value: "foobar"},
@@ -284,18 +326,21 @@ func Test_decodeFileToNode_Toml(t *testing.T) {
 					{Name: "parentIDHeaderName", Value: "foobar"},
 					{Name: "prioritySampling", Value: "true"},
 					{Name: "samplingPriorityHeaderName", Value: "foobar"},
-					{Name: "traceIDHeaderName", Value: "foobar"}}},
+					{Name: "traceIDHeaderName", Value: "foobar"},
+				}},
 				{Name: "haystack", Children: []*parser.Node{
 					{Name: "globalTag", Value: "foobar"},
 					{Name: "localAgentHost", Value: "foobar"},
 					{Name: "localAgentPort", Value: "42"},
 					{Name: "parentIDHeaderName", Value: "foobar"},
 					{Name: "spanIDHeaderName", Value: "foobar"},
-					{Name: "traceIDHeaderName", Value: "foobar"}}},
+					{Name: "traceIDHeaderName", Value: "foobar"},
+				}},
 				{Name: "instana", Children: []*parser.Node{
 					{Name: "localAgentHost", Value: "foobar"},
 					{Name: "localAgentPort", Value: "42"},
-					{Name: "logLevel", Value: "foobar"}}},
+					{Name: "logLevel", Value: "foobar"},
+				}},
 				{Name: "jaeger", Children: []*parser.Node{
 					{Name: "gen128Bit", Value: "true"},
 					{Name: "localAgentHostPort", Value: "foobar"},
@@ -303,14 +348,17 @@ func Test_decodeFileToNode_Toml(t *testing.T) {
 					{Name: "samplingParam", Value: "42"},
 					{Name: "samplingServerURL", Value: "foobar"},
 					{Name: "samplingType", Value: "foobar"},
-					{Name: "traceContextHeaderName", Value: "foobar"}}},
+					{Name: "traceContextHeaderName", Value: "foobar"},
+				}},
 				{Name: "serviceName", Value: "foobar"},
 				{Name: "spanNameLimit", Value: "42"},
 				{Name: "zipkin", Children: []*parser.Node{
 					{Name: "httpEndpoint", Value: "foobar"},
 					{Name: "id128Bit", Value: "true"},
 					{Name: "sameSpan", Value: "true"},
-					{Name: "sampleRate", Value: "42"}}}}},
+					{Name: "sampleRate", Value: "42"},
+				}},
+			}},
 		},
 	}
 
@@ -332,25 +380,34 @@ func Test_decodeFileToNode_Yaml(t *testing.T) {
 						{Name: "defaultMode", Value: "foobar"},
 						{Name: "names", Children: []*parser.Node{
 							{Name: "name0", Value: "foobar"},
-							{Name: "name1", Value: "foobar"}}}}},
+							{Name: "name1", Value: "foobar"},
+						}},
+					}},
 					{Name: "names", Children: []*parser.Node{
 						{Name: "name0", Value: "foobar"},
-						{Name: "name1", Value: "foobar"}}}}},
+						{Name: "name1", Value: "foobar"},
+					}},
+				}},
 				{Name: "filePath", Value: "foobar"},
 				{Name: "filters", Children: []*parser.Node{
 					{Name: "minDuration", Value: "42"},
 					{Name: "retryAttempts", Value: "true"},
-					{Name: "statusCodes", Value: "foobar,foobar"}}},
+					{Name: "statusCodes", Value: "foobar,foobar"},
-				{Name: "format", Value: "foobar"}}},
+				}},
+				{Name: "format", Value: "foobar"},
+			}},
 			{Name: "api", Children: []*parser.Node{
 				{Name: "dashboard", Value: "true"},
 				{Name: "entryPoint", Value: "foobar"},
 				{Name: "middlewares", Value: "foobar,foobar"},
 				{Name: "statistics", Children: []*parser.Node{
-					{Name: "recentErrors", Value: "42"}}}}},
+					{Name: "recentErrors", Value: "42"},
+				}},
+			}},
 			{Name: "certificatesResolvers", Children: []*parser.Node{
 				{Name: "default", Children: []*parser.Node{
-					{Name: "acme",
+					{
+						Name: "acme",
 						Children: []*parser.Node{
 							{Name: "acmeLogging", Value: "true"},
 							{Name: "caServer", Value: "foobar"},
@@ -363,7 +420,8 @@ func Test_decodeFileToNode_Yaml(t *testing.T) {
 							{Name: "email", Value: "foobar"},
 							{Name: "entryPoint", Value: "foobar"},
 							{Name: "httpChallenge", Children: []*parser.Node{
-								{Name: "entryPoint", Value: "foobar"}}},
+								{Name: "entryPoint", Value: "foobar"},
+							}},
 							{Name: "keyType", Value: "foobar"},
 							{Name: "storage", Value: "foobar"},
 							{Name: "tlsChallenge"},
@@ -376,33 +434,44 @@ func Test_decodeFileToNode_Yaml(t *testing.T) {
 					{Name: "address", Value: "foobar"},
 					{Name: "forwardedHeaders", Children: []*parser.Node{
 						{Name: "insecure", Value: "true"},
-						{Name: "trustedIPs", Value: "foobar,foobar"}}},
+						{Name: "trustedIPs", Value: "foobar,foobar"},
+					}},
 					{Name: "proxyProtocol", Children: []*parser.Node{
 						{Name: "insecure", Value: "true"},
-						{Name: "trustedIPs", Value: "foobar,foobar"}}},
+						{Name: "trustedIPs", Value: "foobar,foobar"},
+					}},
 					{Name: "transport", Children: []*parser.Node{
 						{Name: "lifeCycle", Children: []*parser.Node{
 							{Name: "graceTimeOut", Value: "42"},
-							{Name: "requestAcceptGraceTimeout", Value: "42"}}},
+							{Name: "requestAcceptGraceTimeout", Value: "42"},
+						}},
 						{Name: "respondingTimeouts", Children: []*parser.Node{
 							{Name: "idleTimeout", Value: "42"},
 							{Name: "readTimeout", Value: "42"},
-							{Name: "writeTimeout", Value: "42"}}}}}}}}},
+							{Name: "writeTimeout", Value: "42"},
+						}},
+					}},
+				}},
+			}},
 			{Name: "global", Children: []*parser.Node{
 				{Name: "checkNewVersion", Value: "true"},
-				{Name: "sendAnonymousUsage", Value: "true"}}},
+				{Name: "sendAnonymousUsage", Value: "true"},
+			}},
 			{Name: "hostResolver", Children: []*parser.Node{
 				{Name: "cnameFlattening", Value: "true"},
 				{Name: "resolvConfig", Value: "foobar"},
-				{Name: "resolvDepth", Value: "42"}}},
+				{Name: "resolvDepth", Value: "42"},
+			}},
 			{Name: "log", Children: []*parser.Node{
 				{Name: "filePath", Value: "foobar"},
 				{Name: "format", Value: "foobar"},
-				{Name: "level", Value: "foobar"}}},
+				{Name: "level", Value: "foobar"},
+			}},
 			{Name: "metrics", Children: []*parser.Node{
 				{Name: "datadog", Children: []*parser.Node{
 					{Name: "address", Value: "foobar"},
-					{Name: "pushInterval", Value: "10s"}}},
+					{Name: "pushInterval", Value: "10s"},
+				}},
 				{Name: "influxDB", Children: []*parser.Node{
 					{Name: "address", Value: "foobar"},
 					{Name: "database", Value: "foobar"},
@@ -410,17 +479,22 @@ func Test_decodeFileToNode_Yaml(t *testing.T) {
 					{Name: "protocol", Value: "foobar"},
 					{Name: "pushInterval", Value: "10s"},
 					{Name: "retentionPolicy", Value: "foobar"},
-					{Name: "username", Value: "foobar"}}},
+					{Name: "username", Value: "foobar"},
+				}},
 				{Name: "prometheus", Children: []*parser.Node{
 					{Name: "buckets", Value: "42,42"},
 					{Name: "entryPoint", Value: "foobar"},
-					{Name: "middlewares", Value: "foobar,foobar"}}},
+					{Name: "middlewares", Value: "foobar,foobar"},
+				}},
 				{Name: "statsD", Children: []*parser.Node{
 					{Name: "address", Value: "foobar"},
-					{Name: "pushInterval", Value: "10s"}}}}},
+					{Name: "pushInterval", Value: "10s"},
+				}},
+			}},
 			{Name: "ping", Children: []*parser.Node{
 				{Name: "entryPoint", Value: "foobar"},
-				{Name: "middlewares", Value: "foobar,foobar"}}},
+				{Name: "middlewares", Value: "foobar,foobar"},
+			}},
 			{Name: "providers", Children: []*parser.Node{
 				{Name: "docker", Children: []*parser.Node{
 					{Name: "constraints", Value: "foobar"},
@@ -435,15 +509,19 @@ func Test_decodeFileToNode_Yaml(t *testing.T) {
 						{Name: "caOptional", Value: "true"},
 						{Name: "cert", Value: "foobar"},
 						{Name: "insecureSkipVerify", Value: "true"},
-						{Name: "key", Value: "foobar"}}},
+						{Name: "key", Value: "foobar"},
+					}},
 					{Name: "useBindPortIP", Value: "true"},
-					{Name: "watch", Value: "true"}}},
+					{Name: "watch", Value: "true"},
+				}},
 				{Name: "file", Children: []*parser.Node{
 					{Name: "debugLogGeneratedTemplate", Value: "true"},
 					{Name: "directory", Value: "foobar"},
 					{Name: "filename", Value: "foobar"},
-					{Name: "watch", Value: "true"}}},
+					{Name: "watch", Value: "true"},
-				{Name: "kubernetesCRD",
+				}},
+				{
+					Name: "kubernetesCRD",
 					Children: []*parser.Node{
 						{Name: "certAuthFilePath", Value: "foobar"},
 						{Name: "disablePassHostHeaders", Value: "true"},
@@ -451,7 +529,9 @@ func Test_decodeFileToNode_Yaml(t *testing.T) {
 						{Name: "ingressClass", Value: "foobar"},
 						{Name: "labelSelector", Value: "foobar"},
 						{Name: "namespaces", Value: "foobar,foobar"},
-						{Name: "token", Value: "foobar"}}},
+						{Name: "token", Value: "foobar"},
+					},
+				},
 				{Name: "kubernetesIngress", Children: []*parser.Node{
 					{Name: "certAuthFilePath", Value: "foobar"},
 					{Name: "disablePassHostHeaders", Value: "true"},
@@ -460,14 +540,17 @@ func Test_decodeFileToNode_Yaml(t *testing.T) {
 					{Name: "ingressEndpoint", Children: []*parser.Node{
 						{Name: "hostname", Value: "foobar"},
 						{Name: "ip", Value: "foobar"},
-						{Name: "publishedService", Value: "foobar"}}},
+						{Name: "publishedService", Value: "foobar"},
+					}},
 					{Name: "labelSelector", Value: "foobar"},
 					{Name: "namespaces", Value: "foobar,foobar"},
-					{Name: "token", Value: "foobar"}}},
+					{Name: "token", Value: "foobar"},
+				}},
 				{Name: "marathon", Children: []*parser.Node{
 					{Name: "basic", Children: []*parser.Node{
 						{Name: "httpBasicAuthUser", Value: "foobar"},
-						{Name: "httpBasicPassword", Value: "foobar"}}},
+						{Name: "httpBasicPassword", Value: "foobar"},
+					}},
 					{Name: "constraints", Value: "foobar"},
 					{Name: "dcosToken", Value: "foobar"},
 					{Name: "defaultRule", Value: "foobar"},
@@ -483,10 +566,12 @@ func Test_decodeFileToNode_Yaml(t *testing.T) {
 						{Name: "caOptional", Value: "true"},
 						{Name: "cert", Value: "foobar"},
 						{Name: "insecureSkipVerify", Value: "true"},
-						{Name: "key", Value: "foobar"}}},
+						{Name: "key", Value: "foobar"},
+					}},
 					{Name: "tlsHandshakeTimeout", Value: "42"},
 					{Name: "trace", Value: "true"},
-					{Name: "watch", Value: "true"}}},
+					{Name: "watch", Value: "true"},
+				}},
 				{Name: "providersThrottleDuration", Value: "42"},
 				{Name: "rancher", Children: []*parser.Node{
 					{Name: "constraints", Value: "foobar"},
@@ -496,17 +581,22 @@ func Test_decodeFileToNode_Yaml(t *testing.T) {
 					{Name: "intervalPoll", Value: "true"},
 					{Name: "prefix", Value: "foobar"},
 					{Name: "refreshSeconds", Value: "42"},
-					{Name: "watch", Value: "true"}}},
+					{Name: "watch", Value: "true"},
+				}},
 				{Name: "rest", Children: []*parser.Node{
-					{Name: "entryPoint", Value: "foobar"}}}}},
+					{Name: "entryPoint", Value: "foobar"},
+				}},
+			}},
 			{Name: "serversTransport", Children: []*parser.Node{
 				{Name: "forwardingTimeouts", Children: []*parser.Node{
 					{Name: "dialTimeout", Value: "42"},
 					{Name: "idleConnTimeout", Value: "42"},
-					{Name: "responseHeaderTimeout", Value: "42"}}},
+					{Name: "responseHeaderTimeout", Value: "42"},
+				}},
 				{Name: "insecureSkipVerify", Value: "true"},
 				{Name: "maxIdleConnsPerHost", Value: "42"},
-				{Name: "rootCAs", Value: "foobar,foobar"}}},
+				{Name: "rootCAs", Value: "foobar,foobar"},
+			}},
 			{Name: "tracing", Children: []*parser.Node{
 				{Name: "datadog", Children: []*parser.Node{
 					{Name: "bagagePrefixHeaderName", Value: "foobar"},
@@ -516,18 +606,21 @@ func Test_decodeFileToNode_Yaml(t *testing.T) {
 					{Name: "parentIDHeaderName", Value: "foobar"},
 					{Name: "prioritySampling", Value: "true"},
 					{Name: "samplingPriorityHeaderName", Value: "foobar"},
-					{Name: "traceIDHeaderName", Value: "foobar"}}},
+					{Name: "traceIDHeaderName", Value: "foobar"},
+				}},
 				{Name: "haystack", Children: []*parser.Node{
 					{Name: "globalTag", Value: "foobar"},
 					{Name: "localAgentHost", Value: "foobar"},
 					{Name: "localAgentPort", Value: "42"},
 					{Name: "parentIDHeaderName", Value: "foobar"},
 					{Name: "spanIDHeaderName", Value: "foobar"},
-					{Name: "traceIDHeaderName", Value: "foobar"}}},
+					{Name: "traceIDHeaderName", Value: "foobar"},
+				}},
 				{Name: "instana", Children: []*parser.Node{
 					{Name: "localAgentHost", Value: "foobar"},
 					{Name: "localAgentPort", Value: "42"},
-					{Name: "logLevel", Value: "foobar"}}},
+					{Name: "logLevel", Value: "foobar"},
+				}},
 				{Name: "jaeger", Children: []*parser.Node{
 					{Name: "gen128Bit", Value: "true"},
 					{Name: "localAgentHostPort", Value: "foobar"},
@@ -535,14 +628,17 @@ func Test_decodeFileToNode_Yaml(t *testing.T) {
 					{Name: "samplingParam", Value: "42"},
 					{Name: "samplingServerURL", Value: "foobar"},
 					{Name: "samplingType", Value: "foobar"},
-					{Name: "traceContextHeaderName", Value: "foobar"}}},
+					{Name: "traceContextHeaderName", Value: "foobar"},
+				}},
 				{Name: "serviceName", Value: "foobar"},
 				{Name: "spanNameLimit", Value: "42"},
 				{Name: "zipkin", Children: []*parser.Node{
 					{Name: "httpEndpoint", Value: "foobar"},
 					{Name: "id128Bit", Value: "true"},
 					{Name: "sameSpan", Value: "true"},
-					{Name: "sampleRate", Value: "42"}}}}},
+					{Name: "sampleRate", Value: "42"},
+				}},
+			}},
 		},
 	}
 

pkg/config/flag/flagparser.go

@@ -101,7 +101,7 @@ func (f *flagSet) parseOne() (bool, error) {
 	return true, nil
 }
 
-func (f *flagSet) setValue(name string, value string) {
+func (f *flagSet) setValue(name, value string) {
 	srcKey := parser.DefaultRootName + "." + name
 	neutralKey := strings.ToLower(srcKey)
 

pkg/config/kv/kv_node.go

@@ -81,8 +81,8 @@ func filterPairs(pairs []*store.KVPair, filters []string) []*store.KVPair {
 		return pairs[i].Key < pairs[j].Key
 	})
 
-	var simplePairs = map[string]*store.KVPair{}
+	simplePairs := map[string]*store.KVPair{}
-	var slicePairs = map[string][]string{}
+	slicePairs := map[string][]string{}
 
 	for _, pair := range pairs {
 		if len(filters) == 0 {

pkg/config/parser/element_fill_test.go

@@ -498,27 +498,31 @@ func TestFill(t *testing.T) {
 						Children: []*Node{
 							{Name: "Fii", FieldName: "Fii", Value: "huu", Kind: reflect.String},
 							{Name: "Fuu", FieldName: "Fuu", Value: "6", Kind: reflect.Int},
-						}},
+						},
-				}},
+					},
+				},
+			},
 			element: &struct {
 				Foo struct {
 					Fii string
 					Fuu int
 				}
 			}{},
-			expected: expected{element: &struct {
+			expected: expected{
-				Foo struct {
+				element: &struct {
-					Fii string
+					Foo struct {
-					Fuu int
+						Fii string
-				}
+						Fuu int
-			}{
+					}
-				Foo: struct {
-					Fii string
-					Fuu int
 				}{
-					Fii: "huu",
+					Foo: struct {
-					Fuu: 6,
+						Fii string
-				}},
+						Fuu int
+					}{
+						Fii: "huu",
+						Fuu: 6,
+					},
+				},
 			},
 		},
 		{
@@ -534,27 +538,31 @@ func TestFill(t *testing.T) {
 						Children: []*Node{
 							{Name: "Fii", FieldName: "Fii", Value: "huu", Kind: reflect.String},
 							{Name: "Fuu", FieldName: "Fuu", Value: "6", Kind: reflect.Int},
-						}},
+						},
-				}},
+					},
+				},
+			},
 			element: &struct {
 				Foo *struct {
 					Fii string
 					Fuu int
 				}
 			}{},
-			expected: expected{element: &struct {
+			expected: expected{
-				Foo *struct {
+				element: &struct {
-					Fii string
+					Foo *struct {
-					Fuu int
+						Fii string
-				}
+						Fuu int
-			}{
+					}
-				Foo: &struct {
-					Fii string
-					Fuu int
 				}{
-					Fii: "huu",
+					Foo: &struct {
-					Fuu: 6,
+						Fii string
-				}},
+						Fuu int
+					}{
+						Fii: "huu",
+						Fuu: 6,
+					},
+				},
 			},
 		},
 		{
@@ -568,23 +576,26 @@ func TestFill(t *testing.T) {
 						FieldName: "Foo",
 						Kind:      reflect.Ptr,
 					},
-				}},
+				},
+			},
 			element: &struct {
 				Foo *struct {
 					Fii string
 					Fuu int
 				} `label:"allowEmpty"`
 			}{},
-			expected: expected{element: &struct {
+			expected: expected{
-				Foo *struct {
+				element: &struct {
-					Fii string
+					Foo *struct {
-					Fuu int
+						Fii string
-				} `label:"allowEmpty"`
+						Fuu int
-			}{
+					} `label:"allowEmpty"`
-				Foo: &struct {
+				}{
-					Fii string
+					Foo: &struct {
-					Fuu int
+						Fii string
-				}{}},
+						Fuu int
+					}{},
+				},
 			},
 		},
 		{
@@ -599,19 +610,21 @@ func TestFill(t *testing.T) {
 						Kind:      reflect.Ptr,
 						Disabled:  true,
 					},
-				}},
+				},
+			},
 			element: &struct {
 				Foo *struct {
 					Fii string
 					Fuu int
 				} `label:"allowEmpty"`
 			}{},
-			expected: expected{element: &struct {
+			expected: expected{
-				Foo *struct {
+				element: &struct {
-					Fii string
+					Foo *struct {
-					Fuu int
+						Fii string
-				} `label:"allowEmpty"`
+						Fuu int
-			}{},
+					} `label:"allowEmpty"`
+				}{},
 			},
 		},
 		{
@@ -628,20 +641,23 @@ func TestFill(t *testing.T) {
 						Children: []*Node{
 							{Name: "Fii", FieldName: "Fii", Value: "huu", Kind: reflect.String},
 							{Name: "Fuu", FieldName: "Fuu", Value: "6", Kind: reflect.Int},
-						}},
+						},
-				}},
+					},
+				},
+			},
 			element: &struct {
 				Foo *struct {
 					Fii string
 					Fuu int
 				} `label:"allowEmpty"`
 			}{},
-			expected: expected{element: &struct {
+			expected: expected{
-				Foo *struct {
+				element: &struct {
-					Fii string
+					Foo *struct {
-					Fuu int
+						Fii string
-				} `label:"allowEmpty"`
+						Fuu int
-			}{},
+					} `label:"allowEmpty"`
+				}{},
 			},
 		},
 		{
@@ -657,18 +673,22 @@ func TestFill(t *testing.T) {
 						Children: []*Node{
 							{Name: "name1", Value: "hii", Kind: reflect.String},
 							{Name: "name2", Value: "huu", Kind: reflect.String},
-						}},
+						},
-				}},
+					},
+				},
+			},
 			element: &struct {
 				Foo map[string]string
 			}{},
-			expected: expected{element: &struct {
+			expected: expected{
-				Foo map[string]string
+				element: &struct {
-			}{
+					Foo map[string]string
-				Foo: map[string]string{
+				}{
-					"name1": "hii",
+					Foo: map[string]string{
-					"name2": "huu",
+						"name1": "hii",
-				}},
+						"name2": "huu",
+					},
+				},
 			},
 		},
 		{
@@ -696,18 +716,22 @@ func TestFill(t *testing.T) {
 									{Name: "Fii", FieldName: "Fii", Kind: reflect.String, Value: "huu"},
 								},
 							},
-						}},
+						},
-				}},
+					},
+				},
+			},
 			element: &struct {
 				Foo map[string]struct{ Fii string }
 			}{},
-			expected: expected{element: &struct {
+			expected: expected{
-				Foo map[string]struct{ Fii string }
+				element: &struct {
-			}{
+					Foo map[string]struct{ Fii string }
-				Foo: map[string]struct{ Fii string }{
+				}{
-					"name1": {Fii: "hii"},
+					Foo: map[string]struct{ Fii string }{
-					"name2": {Fii: "huu"},
+						"name1": {Fii: "hii"},
-				}},
+						"name2": {Fii: "huu"},
+					},
+				},
 			},
 		},
 		{
@@ -1186,8 +1210,10 @@ func TestFill(t *testing.T) {
 						Kind:      reflect.Struct,
 						Children: []*Node{
 							{Name: "Fuu", FieldName: "Fuu", Value: "huu", Kind: reflect.String},
-						}},
+						},
-				}},
+					},
+				},
+			},
 			element: &struct {
 				Foo *InitializedFoo
 			}{},
@@ -1212,8 +1238,10 @@ func TestFill(t *testing.T) {
 						Kind:      reflect.Struct,
 						Children: []*Node{
 							{Name: "Fuu", FieldName: "Fuu", Value: "huu", Kind: reflect.String},
-						}},
+						},
-				}},
+					},
+				},
+			},
 			element: &struct {
 				Foo *wrongInitialledFoo
 			}{},
@@ -1273,8 +1301,10 @@ func TestFill(t *testing.T) {
 						Kind:      reflect.Struct,
 						Children: []*Node{
 							{Name: "Fuu", FieldName: "Fuu", Value: "huu", Kind: reflect.String},
-						}},
+						},
-				}},
+					},
+				},
+			},
 			element: &struct {
 				Foo struct {
 					FiiFoo
@@ -1401,8 +1431,10 @@ func TestFill(t *testing.T) {
 	}
 }
 
-type NamedType string
+type (
-type NamedTypeInt int
+	NamedType    string
+	NamedTypeInt int
+)
 
 type InitializedFoo struct {
 	Fii string

pkg/config/parser/element_nodes_test.go

@@ -23,9 +23,10 @@ func TestEncodeToNode(t *testing.T) {
 			element: struct {
 				Foo string `description:"text"`
 			}{Foo: "bar"},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Value: "bar", Description: "text"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Foo", FieldName: "Foo", Value: "bar", Description: "text"},
+				}},
 			},
 		},
 		{
@@ -33,9 +34,10 @@ func TestEncodeToNode(t *testing.T) {
 			element: struct {
 				Foo string
 			}{Foo: "bar"},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Value: "bar"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Foo", FieldName: "Foo", Value: "bar"},
+				}},
 			},
 		},
 		{
@@ -44,10 +46,11 @@ func TestEncodeToNode(t *testing.T) {
 				Foo string
 				Fii string
 			}{Foo: "bar", Fii: "hii"},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Value: "bar"},
+				node: &Node{Name: "traefik", Children: []*Node{
-				{Name: "Fii", FieldName: "Fii", Value: "hii"},
+					{Name: "Foo", FieldName: "Foo", Value: "bar"},
-			}},
+					{Name: "Fii", FieldName: "Fii", Value: "hii"},
+				}},
 			},
 		},
 		{
@@ -55,9 +58,10 @@ func TestEncodeToNode(t *testing.T) {
 			element: struct {
 				Foo int
 			}{Foo: 1},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Value: "1"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Foo", FieldName: "Foo", Value: "1"},
+				}},
 			},
 		},
 		{
@@ -65,9 +69,10 @@ func TestEncodeToNode(t *testing.T) {
 			element: struct {
 				Foo int8
 			}{Foo: 2},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Value: "2"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Foo", FieldName: "Foo", Value: "2"},
+				}},
 			},
 		},
 		{
@@ -75,9 +80,10 @@ func TestEncodeToNode(t *testing.T) {
 			element: struct {
 				Foo int16
 			}{Foo: 2},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Value: "2"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Foo", FieldName: "Foo", Value: "2"},
+				}},
 			},
 		},
 		{
@@ -85,9 +91,10 @@ func TestEncodeToNode(t *testing.T) {
 			element: struct {
 				Foo int32
 			}{Foo: 2},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Value: "2"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Foo", FieldName: "Foo", Value: "2"},
+				}},
 			},
 		},
 		{
@@ -95,9 +102,10 @@ func TestEncodeToNode(t *testing.T) {
 			element: struct {
 				Foo int64
 			}{Foo: 2},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Value: "2"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Foo", FieldName: "Foo", Value: "2"},
+				}},
 			},
 		},
 		{
@@ -105,9 +113,10 @@ func TestEncodeToNode(t *testing.T) {
 			element: struct {
 				Foo uint
 			}{Foo: 1},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Value: "1"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Foo", FieldName: "Foo", Value: "1"},
+				}},
 			},
 		},
 		{
@@ -115,9 +124,10 @@ func TestEncodeToNode(t *testing.T) {
 			element: struct {
 				Foo uint8
 			}{Foo: 2},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Value: "2"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Foo", FieldName: "Foo", Value: "2"},
+				}},
 			},
 		},
 		{
@@ -125,9 +135,10 @@ func TestEncodeToNode(t *testing.T) {
 			element: struct {
 				Foo uint16
 			}{Foo: 2},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Value: "2"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Foo", FieldName: "Foo", Value: "2"},
+				}},
 			},
 		},
 		{
@@ -135,9 +146,10 @@ func TestEncodeToNode(t *testing.T) {
 			element: struct {
 				Foo uint32
 			}{Foo: 2},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Value: "2"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Foo", FieldName: "Foo", Value: "2"},
+				}},
 			},
 		},
 		{
@@ -145,9 +157,10 @@ func TestEncodeToNode(t *testing.T) {
 			element: struct {
 				Foo uint64
 			}{Foo: 2},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Value: "2"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Foo", FieldName: "Foo", Value: "2"},
+				}},
 			},
 		},
 		{
@@ -155,9 +168,10 @@ func TestEncodeToNode(t *testing.T) {
 			element: struct {
 				Foo float32
 			}{Foo: 1.12},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Value: "1.120000"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Foo", FieldName: "Foo", Value: "1.120000"},
+				}},
 			},
 		},
 		{
@@ -165,9 +179,10 @@ func TestEncodeToNode(t *testing.T) {
 			element: struct {
 				Foo float64
 			}{Foo: 1.12},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Value: "1.120000"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Foo", FieldName: "Foo", Value: "1.120000"},
+				}},
 			},
 		},
 		{
@@ -175,9 +190,10 @@ func TestEncodeToNode(t *testing.T) {
 			element: struct {
 				Foo bool
 			}{Foo: true},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Value: "true"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Foo", FieldName: "Foo", Value: "true"},
+				}},
 			},
 		},
 		{
@@ -196,12 +212,13 @@ func TestEncodeToNode(t *testing.T) {
 					Fuu: "huu",
 				},
 			},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Children: []*Node{
+				node: &Node{Name: "traefik", Children: []*Node{
-					{Name: "Fii", FieldName: "Fii", Value: "hii"},
+					{Name: "Foo", FieldName: "Foo", Children: []*Node{
-					{Name: "Fuu", FieldName: "Fuu", Value: "huu"},
+						{Name: "Fii", FieldName: "Fii", Value: "hii"},
+						{Name: "Fuu", FieldName: "Fuu", Value: "huu"},
+					}},
 				}},
-			}},
 			},
 		},
 		{
@@ -220,11 +237,12 @@ func TestEncodeToNode(t *testing.T) {
 					fuu: "huu",
 				},
 			},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Children: []*Node{
+				node: &Node{Name: "traefik", Children: []*Node{
-					{Name: "Fii", FieldName: "Fii", Value: "hii"},
+					{Name: "Foo", FieldName: "Foo", Children: []*Node{
+						{Name: "Fii", FieldName: "Fii", Value: "hii"},
+					}},
 				}},
-			}},
 			},
 		},
 		{
@@ -243,12 +261,13 @@ func TestEncodeToNode(t *testing.T) {
 					Fuu: "huu",
 				},
 			},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Children: []*Node{
+				node: &Node{Name: "traefik", Children: []*Node{
-					{Name: "Fii", FieldName: "Fii", Value: "hii"},
+					{Name: "Foo", FieldName: "Foo", Children: []*Node{
-					{Name: "Fuu", FieldName: "Fuu", Value: "huu"},
+						{Name: "Fii", FieldName: "Fii", Value: "hii"},
+						{Name: "Fuu", FieldName: "Fuu", Value: "huu"},
+					}},
 				}},
-			}},
 			},
 		},
 		{
@@ -267,12 +286,13 @@ func TestEncodeToNode(t *testing.T) {
 					Fuu: "huu",
 				},
 			},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Children: []*Node{
+				node: &Node{Name: "traefik", Children: []*Node{
-					{Name: "Fii", FieldName: "Fii", Value: "hii"},
+					{Name: "Foo", FieldName: "Foo", Children: []*Node{
-					{Name: "Fuu", FieldName: "Fuu", Value: "huu"},
+						{Name: "Fii", FieldName: "Fii", Value: "hii"},
+						{Name: "Fuu", FieldName: "Fuu", Value: "huu"},
+					}},
 				}},
-			}},
 			},
 		},
 		{
@@ -291,11 +311,12 @@ func TestEncodeToNode(t *testing.T) {
 					Fuu: "huu",
 				},
 			},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Children: []*Node{
+				node: &Node{Name: "traefik", Children: []*Node{
-					{Name: "Fuu", FieldName: "Fuu", Value: "huu"},
+					{Name: "Foo", FieldName: "Foo", Children: []*Node{
+						{Name: "Fuu", FieldName: "Fuu", Value: "huu"},
+					}},
 				}},
-			}},
 			},
 		},
 		{
@@ -314,12 +335,13 @@ func TestEncodeToNode(t *testing.T) {
 					Fuu: 4,
 				},
 			},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Children: []*Node{
+				node: &Node{Name: "traefik", Children: []*Node{
-					{Name: "Fii", FieldName: "Fii", Value: "6"},
+					{Name: "Foo", FieldName: "Foo", Children: []*Node{
-					{Name: "Fuu", FieldName: "Fuu", Value: "4"},
+						{Name: "Fii", FieldName: "Fii", Value: "6"},
+						{Name: "Fuu", FieldName: "Fuu", Value: "4"},
+					}},
 				}},
-			}},
 			},
 		},
 		{
@@ -338,12 +360,13 @@ func TestEncodeToNode(t *testing.T) {
 					Fuu: true,
 				},
 			},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Children: []*Node{
+				node: &Node{Name: "traefik", Children: []*Node{
-					{Name: "Fii", FieldName: "Fii", Value: "true"},
+					{Name: "Foo", FieldName: "Foo", Children: []*Node{
-					{Name: "Fuu", FieldName: "Fuu", Value: "true"},
+						{Name: "Fii", FieldName: "Fii", Value: "true"},
+						{Name: "Fuu", FieldName: "Fuu", Value: "true"},
+					}},
 				}},
-			}},
 			},
 		},
 		{
@@ -386,9 +409,10 @@ func TestEncodeToNode(t *testing.T) {
 					Fuu string
 				}{},
 			},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Value: "true"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Foo", FieldName: "Foo", Value: "true"},
+				}},
 			},
 		},
 		{
@@ -452,113 +476,127 @@ func TestEncodeToNode(t *testing.T) {
 		{
 			desc:    "slice of string",
 			element: struct{ Bar []string }{Bar: []string{"huu", "hii"}},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Bar", FieldName: "Bar", Value: "huu, hii"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Bar", FieldName: "Bar", Value: "huu, hii"},
+				}},
 			},
 		},
 		{
 			desc:    "slice of int",
 			element: struct{ Bar []int }{Bar: []int{4, 2, 3}},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Bar", FieldName: "Bar", Value: "4, 2, 3"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Bar", FieldName: "Bar", Value: "4, 2, 3"},
+				}},
 			},
 		},
 		{
 			desc:    "slice of int8",
 			element: struct{ Bar []int8 }{Bar: []int8{4, 2, 3}},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Bar", FieldName: "Bar", Value: "4, 2, 3"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Bar", FieldName: "Bar", Value: "4, 2, 3"},
+				}},
 			},
 		},
 		{
 			desc:    "slice of int16",
 			element: struct{ Bar []int16 }{Bar: []int16{4, 2, 3}},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Bar", FieldName: "Bar", Value: "4, 2, 3"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Bar", FieldName: "Bar", Value: "4, 2, 3"},
+				}},
 			},
 		},
 		{
 			desc:    "slice of int32",
 			element: struct{ Bar []int32 }{Bar: []int32{4, 2, 3}},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Bar", FieldName: "Bar", Value: "4, 2, 3"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Bar", FieldName: "Bar", Value: "4, 2, 3"},
+				}},
 			},
 		},
 		{
 			desc:    "slice of int64",
 			element: struct{ Bar []int64 }{Bar: []int64{4, 2, 3}},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Bar", FieldName: "Bar", Value: "4, 2, 3"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Bar", FieldName: "Bar", Value: "4, 2, 3"},
+				}},
 			},
 		},
 		{
 			desc:    "slice of uint",
 			element: struct{ Bar []uint }{Bar: []uint{4, 2, 3}},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Bar", FieldName: "Bar", Value: "4, 2, 3"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Bar", FieldName: "Bar", Value: "4, 2, 3"},
+				}},
 			},
 		},
 		{
 			desc:    "slice of uint8",
 			element: struct{ Bar []uint8 }{Bar: []uint8{4, 2, 3}},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Bar", FieldName: "Bar", Value: "4, 2, 3"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Bar", FieldName: "Bar", Value: "4, 2, 3"},
+				}},
 			},
 		},
 		{
 			desc:    "slice of uint16",
 			element: struct{ Bar []uint16 }{Bar: []uint16{4, 2, 3}},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Bar", FieldName: "Bar", Value: "4, 2, 3"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Bar", FieldName: "Bar", Value: "4, 2, 3"},
+				}},
 			},
 		},
 		{
 			desc:    "slice of uint32",
 			element: struct{ Bar []uint32 }{Bar: []uint32{4, 2, 3}},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Bar", FieldName: "Bar", Value: "4, 2, 3"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Bar", FieldName: "Bar", Value: "4, 2, 3"},
+				}},
 			},
 		},
 		{
 			desc:    "slice of uint64",
 			element: struct{ Bar []uint64 }{Bar: []uint64{4, 2, 3}},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Bar", FieldName: "Bar", Value: "4, 2, 3"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Bar", FieldName: "Bar", Value: "4, 2, 3"},
+				}},
 			},
 		},
 		{
 			desc:    "slice of float32",
 			element: struct{ Bar []float32 }{Bar: []float32{4.1, 2, 3.2}},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Bar", FieldName: "Bar", Value: "4.100000, 2.000000, 3.200000"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Bar", FieldName: "Bar", Value: "4.100000, 2.000000, 3.200000"},
+				}},
 			},
 		},
 		{
 			desc:    "slice of float64",
 			element: struct{ Bar []float64 }{Bar: []float64{4.1, 2, 3.2}},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Bar", FieldName: "Bar", Value: "4.100000, 2.000000, 3.200000"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Bar", FieldName: "Bar", Value: "4.100000, 2.000000, 3.200000"},
+				}},
 			},
 		},
 		{
 			desc:    "slice of bool",
 			element: struct{ Bar []bool }{Bar: []bool{true, false, true}},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Bar", FieldName: "Bar", Value: "true, false, true"},
+				node: &Node{Name: "traefik", Children: []*Node{
-			}},
+					{Name: "Bar", FieldName: "Bar", Value: "true, false, true"},
+				}},
 			},
 		},
 		{
@@ -708,12 +746,13 @@ func TestEncodeToNode(t *testing.T) {
 					},
 				},
 			},
-			expected: expected{node: &Node{Name: "traefik", Children: []*Node{
+			expected: expected{
-				{Name: "Foo", FieldName: "Foo", Children: []*Node{
+				node: &Node{Name: "traefik", Children: []*Node{
-					{Name: "Fii", FieldName: "Fii", Value: "hii"},
+					{Name: "Foo", FieldName: "Foo", Children: []*Node{
-					{Name: "Fuu", FieldName: "Fuu", Value: "huu"},
+						{Name: "Fii", FieldName: "Fii", Value: "hii"},
+						{Name: "Fuu", FieldName: "Fuu", Value: "huu"},
+					}},
 				}},
-			}},
 			},
 		},
 	}

pkg/config/parser/nodes_metadata_test.go

@@ -682,7 +682,8 @@ func TestAddMetadata(t *testing.T) {
 							Children: []*Node{
 								{Name: "Bar", FieldName: "Bar", Value: "bir", Kind: reflect.String},
 								{Name: "Bur", FieldName: "Bur", Value: "fuu", Kind: reflect.String},
-							}},
+							},
+						},
 					},
 				},
 			},
@@ -728,8 +729,10 @@ func TestAddMetadata(t *testing.T) {
 									Kind:      reflect.Struct,
 									Children: []*Node{
 										{Name: "Bur", FieldName: "Bur", Value: "fuu", Kind: reflect.String},
-									}},
+									},
-							}},
+								},
+							},
+						},
 					},
 				},
 			},
@@ -797,22 +800,26 @@ func TestAddMetadata(t *testing.T) {
 									Children: []*Node{
 										{Name: "Fii", FieldName: "Fii", Kind: reflect.String, Value: "fii"},
 										{Name: "Fee", FieldName: "Fee", Kind: reflect.Int, Value: "1"},
-									}},
+									},
+								},
 								{
 									Name:      "Bur",
 									FieldName: "Bur",
 									Kind:      reflect.Struct,
 									Children: []*Node{
 										{Name: "Faa", FieldName: "Faa", Kind: reflect.String, Value: "faa"},
-									}},
+									},
-							}},
+								},
+							},
+						},
 						{
 							Name:      "Fii",
 							FieldName: "Fii",
 							Kind:      reflect.Struct,
 							Children: []*Node{
 								{Name: "FiiBar", FieldName: "FiiBar", Kind: reflect.String, Value: "fiiBar"},
-							}},
+							},
+						},
 					},
 				},
 			},

pkg/config/runtime/runtime_http.go

@@ -168,7 +168,7 @@ func (s *ServiceInfo) AddError(err error, critical bool) {
 
 // UpdateServerStatus sets the status of the server in the ServiceInfo.
 // It is the responsibility of the caller to check that s is not nil.
-func (s *ServiceInfo) UpdateServerStatus(server string, status string) {
+func (s *ServiceInfo) UpdateServerStatus(server, status string) {
 	s.serverStatusMu.Lock()
 	defer s.serverStatusMu.Unlock()
 

pkg/healthcheck/healthcheck.go

@@ -22,8 +22,10 @@ const (
 	serverDown = "DOWN"
 )
 
-var singleton *HealthCheck
+var (
-var once sync.Once
+	singleton *HealthCheck
+	once      sync.Once
+)
 
 // Balancer is the set of operations required to manage the list of servers in a load-balancer.
 type Balancer interface {

pkg/healthcheck/healthcheck_test.go

@@ -16,8 +16,10 @@ import (
 	"github.com/vulcand/oxy/roundrobin"
 )
 
-const healthCheckInterval = 200 * time.Millisecond
+const (
-const healthCheckTimeout = 100 * time.Millisecond
+	healthCheckInterval = 200 * time.Millisecond
+	healthCheckTimeout  = 100 * time.Millisecond
+)
 
 type testHandler struct {
 	done           func()
@@ -148,7 +150,7 @@ func TestSetBackendsConfiguration(t *testing.T) {
 			assert.Equal(t, test.expectedNumRemovedServers, lb.numRemovedServers, "removed servers")
 			assert.Equal(t, test.expectedNumUpsertedServers, lb.numUpsertedServers, "upserted servers")
 			// FIXME re add metrics
-			//assert.Equal(t, test.expectedGaugeValue, collectingMetrics.Gauge.GaugeValue, "ServerUp Gauge")
+			// assert.Equal(t, test.expectedGaugeValue, collectingMetrics.Gauge.GaugeValue, "ServerUp Gauge")
 		})
 	}
 }

pkg/job/job.go

@@ -6,9 +6,7 @@ import (
 	"github.com/cenkalti/backoff/v4"
 )
 
-var (
+var _ backoff.BackOff = (*BackOff)(nil)
-	_ backoff.BackOff = (*BackOff)(nil)
-)
 
 const (
 	defaultMinJobInterval = 30 * time.Second

pkg/job/job_test.go

@@ -24,21 +24,21 @@ func TestJobBackOff(t *testing.T) {
 	exp.MinJobInterval = testMinJobInterval
 	exp.Reset()
 
-	var expectedResults = []time.Duration{500, 500, 500, 1000, 2000, 4000, 5000, 5000, 500, 1000, 2000, 4000, 5000, 5000}
+	expectedResults := []time.Duration{500, 500, 500, 1000, 2000, 4000, 5000, 5000, 500, 1000, 2000, 4000, 5000, 5000}
 	for i, d := range expectedResults {
 		expectedResults[i] = d * time.Millisecond
 	}
 
 	for i, expected := range expectedResults {
 		// Assert that the next backoff falls in the expected range.
-		var minInterval = expected - time.Duration(testRandomizationFactor*float64(expected))
+		minInterval := expected - time.Duration(testRandomizationFactor*float64(expected))
-		var maxInterval = expected + time.Duration(testRandomizationFactor*float64(expected))
+		maxInterval := expected + time.Duration(testRandomizationFactor*float64(expected))
 
 		if i < 3 || i == 8 {
 			time.Sleep(2 * time.Second)
 		}
 
-		var actualInterval = exp.NextBackOff()
+		actualInterval := exp.NextBackOff()
 		if !(minInterval <= actualInterval && actualInterval <= maxInterval) {
 			t.Error("error")
 		}

pkg/log/log.go

@@ -101,7 +101,7 @@ func OpenFile(path string) error {
 	logFilePath = path
 
 	var err error
-	logFile, err = os.OpenFile(logFilePath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
+	logFile, err = os.OpenFile(logFilePath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0o666)
 	if err != nil {
 		return err
 	}

pkg/metrics/statsd.go

@@ -11,8 +11,10 @@ import (
 	"github.com/go-kit/kit/metrics/statsd"
 )
 
-var statsdClient *statsd.Statsd
+var (
-var statsdTicker *time.Ticker
+	statsdClient *statsd.Statsd
+	statsdTicker *time.Ticker
+)
 
 const (
 	statsdMetricsServiceReqsName      = "service.request.total"

pkg/middlewares/accesslog/capture_response_writer.go

@@ -9,9 +9,7 @@ import (
 	"github.com/containous/traefik/v2/pkg/middlewares"
 )
 
-var (
+var _ middlewares.Stateful = &captureResponseWriterWithCloseNotify{}
-	_ middlewares.Stateful = &captureResponseWriterWithCloseNotify{}
-)
 
 type capturer interface {
 	http.ResponseWriter

pkg/middlewares/accesslog/field_middleware.go

@@ -19,7 +19,7 @@ type FieldHandler struct {
 }
 
 // NewFieldHandler creates a Field handler.
-func NewFieldHandler(next http.Handler, name string, value string, applyFn FieldApply) http.Handler {
+func NewFieldHandler(next http.Handler, name, value string, applyFn FieldApply) http.Handler {
 	return &FieldHandler{next: next, name: name, value: value, applyFn: applyFn}
 }
 

pkg/middlewares/accesslog/logger.go

@@ -131,11 +131,11 @@ func NewHandler(config *types.AccessLog) (*Handler, error) {
 func openAccessLogFile(filePath string) (*os.File, error) {
 	dir := filepath.Dir(filePath)
 
-	if err := os.MkdirAll(dir, 0755); err != nil {
+	if err := os.MkdirAll(dir, 0o755); err != nil {
 		return nil, fmt.Errorf("failed to create log path %s: %w", dir, err)
 	}
 
-	file, err := os.OpenFile(filePath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0664)
+	file, err := os.OpenFile(filePath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0o664)
 	if err != nil {
 		return nil, fmt.Errorf("error opening file %s: %w", filePath, err)
 	}
@@ -249,7 +249,7 @@ func (h *Handler) Rotate() error {
 	}
 
 	var err error
-	h.file, err = os.OpenFile(h.config.FilePath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0664)
+	h.file, err = os.OpenFile(h.config.FilePath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0o664)
 	if err != nil {
 		return err
 	}
@@ -259,7 +259,7 @@ func (h *Handler) Rotate() error {
 	return nil
 }
 
-func silentSplitHostPort(value string) (host string, port string) {
+func silentSplitHostPort(value string) (host, port string) {
 	host, port, err := net.SplitHostPort(value)
 	if err != nil {
 		return value, "-"

pkg/middlewares/accesslog/logger_formatters.go

@@ -21,7 +21,7 @@ type CommonLogFormatter struct{}
 func (f *CommonLogFormatter) Format(entry *logrus.Entry) ([]byte, error) {
 	b := &bytes.Buffer{}
 
-	var timestamp = defaultValue
+	timestamp := defaultValue
 	if v, ok := entry.Data[StartUTC]; ok {
 		timestamp = v.(time.Time).Format(commonLogTimeFormat)
 	} else if v, ok := entry.Data[StartLocal]; ok {
@@ -52,7 +52,7 @@ func (f *CommonLogFormatter) Format(entry *logrus.Entry) ([]byte, error) {
 	return b.Bytes(), err
 }
 
-func toLog(fields logrus.Fields, key string, defaultValue string, quoted bool) interface{} {
+func toLog(fields logrus.Fields, key, defaultValue string, quoted bool) interface{} {
 	if v, ok := fields[key]; ok {
 		if v == nil {
 			return defaultValue
@@ -73,7 +73,7 @@ func toLog(fields logrus.Fields, key string, defaultValue string, quoted bool) i
 	return defaultValue
 }
 
-func toLogEntry(s string, defaultValue string, quote bool) string {
+func toLogEntry(s, defaultValue string, quote bool) string {
 	if len(s) == 0 {
 		return defaultValue
 	}

pkg/middlewares/auth/forward.go

@@ -158,7 +158,7 @@ func (fa *forwardAuth) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
 	fa.next.ServeHTTP(rw, req)
 }
 
-func writeHeader(req *http.Request, forwardReq *http.Request, trustForwardHeader bool) {
+func writeHeader(req, forwardReq *http.Request, trustForwardHeader bool) {
 	utils.CopyHeaders(forwardReq.Header, req.Header)
 	utils.RemoveHeaders(forwardReq.Header, forward.HopHeaders...)
 

pkg/middlewares/auth/forward_test.go

@@ -325,7 +325,8 @@ func Test_writeHeader(t *testing.T) {
 				"X-Forwarded-Host": "foo.bar",
 				"X-Forwarded-Uri":  "/path?q=1",
 			},
-		}, {
+		},
+		{
 			name: "trust Forward Header with forwarded request Method",
 			headers: map[string]string{
 				"X-Forwarded-Method": "OPTIONS",

pkg/middlewares/forwardedheaders/forwarded_header_test.go

@@ -246,7 +246,8 @@ func TestServeHTTP(t *testing.T) {
 			expectedHeaders: map[string]string{
 				xForwardedHost: "foo.com:8080",
 			},
-		}, {
+		},
+		{
 			desc: "xForwardedServer from req XForwarded",
 			host: "foo.com:8080",
 			expectedHeaders: map[string]string{

pkg/middlewares/headers/headers_test.go

@@ -540,7 +540,8 @@ func TestCORSResponses(t *testing.T) {
 			expected: map[string][]string{
 				"Access-Control-Allow-Origin": {"*"},
 			},
-		}, {
+		},
+		{
 			desc: "Test Simple CustomRequestHeaders Not Hijacked by CORS",
 			header: NewHeader(emptyHandler, dynamic.Headers{
 				CustomRequestHeaders: map[string]string{"foo": "bar"},

pkg/middlewares/middleware.go

@@ -7,6 +7,6 @@ import (
 )
 
 // GetLoggerCtx creates a logger context with the middleware fields.
-func GetLoggerCtx(ctx context.Context, middleware string, middlewareType string) context.Context {
+func GetLoggerCtx(ctx context.Context, middleware, middlewareType string) context.Context {
 	return log.With(ctx, log.Str(log.MiddlewareName, middleware), log.Str(log.MiddlewareType, middlewareType))
 }

pkg/middlewares/passtlsclientcert/pass_tls_client_cert.go

@@ -235,7 +235,7 @@ func writeParts(ctx context.Context, content io.StringWriter, entries []string,
 	}
 }
 
-func writePart(ctx context.Context, content io.StringWriter, entry string, prefix string) {
+func writePart(ctx context.Context, content io.StringWriter, entry, prefix string) {
 	if len(entry) > 0 {
 		_, err := content.WriteString(fmt.Sprintf("%s=%s%s", prefix, entry, subFieldSeparator))
 		if err != nil {

pkg/middlewares/redirect/redirect.go

@@ -24,7 +24,7 @@ type redirect struct {
 }
 
 // New creates a Redirect middleware.
-func newRedirect(next http.Handler, regex string, replacement string, permanent bool, name string) (http.Handler, error) {
+func newRedirect(next http.Handler, regex, replacement string, permanent bool, name string) (http.Handler, error) {
 	re, err := regexp.Compile(regex)
 	if err != nil {
 		return nil, err

pkg/middlewares/requestdecorator/hostresolver.go

@@ -47,7 +47,7 @@ func (hr *Resolver) CNAMEFlatten(ctx context.Context, host string) string {
 	}
 
 	logger := log.FromContext(ctx)
-	var cacheDuration = 0 * time.Second
+	cacheDuration := 0 * time.Second
 	for depth := 0; depth < hr.ResolvDepth; depth++ {
 		resolv, err := cnameResolve(ctx, request, hr.ResolvConfig)
 		if err != nil {
@@ -73,7 +73,7 @@ func (hr *Resolver) CNAMEFlatten(ctx context.Context, host string) string {
 }
 
 // cnameResolve resolves CNAME if exists, and return with the highest TTL.
-func cnameResolve(ctx context.Context, host string, resolvPath string) (*cnameResolv, error) {
+func cnameResolve(ctx context.Context, host, resolvPath string) (*cnameResolv, error) {
 	config, err := dns.ClientConfigFromFile(resolvPath)
 	if err != nil {
 		return nil, fmt.Errorf("invalid resolver configuration file: %s", resolvPath)
@@ -102,7 +102,7 @@ func cnameResolve(ctx context.Context, host string, resolvPath string) (*cnameRe
 	return result[0], nil
 }
 
-func getRecord(client *dns.Client, msg *dns.Msg, server string, port string) (*cnameResolv, error) {
+func getRecord(client *dns.Client, msg *dns.Msg, server, port string) (*cnameResolv, error) {
 	resp, _, err := client.Exchange(msg, net.JoinHostPort(server, port))
 	if err != nil {
 		return nil, fmt.Errorf("exchange error for server %s: %w", server, err)

pkg/middlewares/tracing/forwarder_test.go

@@ -45,7 +45,8 @@ func TestNewForwarder(t *testing.T) {
 				},
 				OperationName: "forward some-service.domain.tld/some-service.domain.tld",
 			},
-		}, {
+		},
+		{
 			desc:          "Simple Forward Tracer with truncation and hashing",
 			spanNameLimit: 101,
 			tracing: &trackingBackenMock{

pkg/middlewares/tracing/mock_tracing_test.go

@@ -18,12 +18,12 @@ func (n MockTracer) StartSpan(operationName string, opts ...opentracing.StartSpa
 }
 
 // Inject belongs to the Tracer interface.
-func (n MockTracer) Inject(sp opentracing.SpanContext, format interface{}, carrier interface{}) error {
+func (n MockTracer) Inject(sp opentracing.SpanContext, format, carrier interface{}) error {
 	return nil
 }
 
 // Extract belongs to the Tracer interface.
-func (n MockTracer) Extract(format interface{}, carrier interface{}) (opentracing.SpanContext, error) {
+func (n MockTracer) Extract(format, carrier interface{}) (opentracing.SpanContext, error) {
 	return nil, opentracing.ErrSpanContextNotFound
 }
 

pkg/provider/acme/account.go

@@ -26,7 +26,7 @@ const (
 )
 
 // NewAccount creates an account.
-func NewAccount(ctx context.Context, email string, keyTypeValue string) (*Account, error) {
+func NewAccount(ctx context.Context, email, keyTypeValue string) (*Account, error) {
 	keyType := GetKeyType(ctx, keyTypeValue)
 
 	// Create a user. New accounts need an email and private key to start

pkg/provider/acme/local_store.go

@@ -103,7 +103,7 @@ func (s *LocalStore) listenSaveAction() {
 				logger.Error(err)
 			}
 
-			err = ioutil.WriteFile(s.filename, data, 0600)
+			err = ioutil.WriteFile(s.filename, data, 0o600)
 			if err != nil {
 				logger.Error(err)
 			}

pkg/provider/acme/local_store_unix.go

@@ -16,7 +16,7 @@ func CheckFile(name string) (bool, error) {
 			if err != nil {
 				return false, err
 			}
-			return false, f.Chmod(0600)
+			return false, f.Chmod(0o600)
 		}
 		return false, err
 	}
@@ -27,7 +27,7 @@ func CheckFile(name string) (bool, error) {
 		return false, err
 	}
 
-	if fi.Mode().Perm()&0077 != 0 {
+	if fi.Mode().Perm()&0o077 != 0 {
 		return false, fmt.Errorf("permissions %o for %s are too open, please use 600", fi.Mode().Perm(), name)
 	}
 

pkg/provider/acme/local_store_windows.go

@@ -12,7 +12,7 @@ func CheckFile(name string) (bool, error) {
 			if err != nil {
 				return false, err
 			}
-			return false, f.Chmod(0600)
+			return false, f.Chmod(0o600)
 		}
 		return false, err
 	}

pkg/provider/acme/provider.go

@@ -27,10 +27,8 @@ import (
 	"github.com/go-acme/lego/v3/registration"
 )
 
-var (
+// oscpMustStaple enables OSCP stapling as from https://github.com/go-acme/lego/issues/270.
-	// oscpMustStaple enables OSCP stapling as from https://github.com/go-acme/lego/issues/270.
+var oscpMustStaple = false
-	oscpMustStaple = false
-)
 
 // Configuration holds ACME configuration provided by users.
 type Configuration struct {
@@ -145,7 +143,7 @@ func (p *Provider) Init() error {
 	return nil
 }
 
-func isAccountMatchingCaServer(ctx context.Context, accountURI string, serverURI string) bool {
+func isAccountMatchingCaServer(ctx context.Context, accountURI, serverURI string) bool {
 	logger := log.FromContext(ctx)
 
 	aru, err := url.Parse(accountURI)
@@ -492,7 +490,7 @@ func (p *Provider) addResolvingDomains(resolvingDomains []string) {
 	}
 }
 
-func (p *Provider) addCertificateForDomain(domain types.Domain, certificate []byte, key []byte, tlsStore string) {
+func (p *Provider) addCertificateForDomain(domain types.Domain, certificate, key []byte, tlsStore string) {
 	p.certsChan <- &CertAndStore{Certificate: Certificate{Certificate: certificate, Key: key, Domain: domain}, Store: tlsStore}
 }
 
@@ -640,7 +638,6 @@ func (p *Provider) renewCertificates(ctx context.Context) {
 				PrivateKey:  cert.Key,
 				Certificate: cert.Certificate.Certificate,
 			}, true, oscpMustStaple)
-
 			if err != nil {
 				logger.Errorf("Error renewing certificate from LE: %v, %v", cert.Domain, err)
 				continue
@@ -679,7 +676,7 @@ func (p *Provider) getUncheckedDomains(ctx context.Context, domainsToCheck []str
 	return searchUncheckedDomains(ctx, domainsToCheck, allDomains)
 }
 
-func searchUncheckedDomains(ctx context.Context, domainsToCheck []string, existentDomains []string) []string {
+func searchUncheckedDomains(ctx context.Context, domainsToCheck, existentDomains []string) []string {
 	var uncheckedDomains []string
 	for _, domainToCheck := range domainsToCheck {
 		if !isDomainAlreadyChecked(domainToCheck, existentDomains) {

pkg/provider/docker/builder_test.go

@@ -95,7 +95,7 @@ func taskSlot(slot int) func(*swarm.Task) {
 	}
 }
 
-func taskNetworkAttachment(id string, name string, driver string, addresses []string) func(*swarm.Task) {
+func taskNetworkAttachment(id, name, driver string, addresses []string) func(*swarm.Task) {
 	return func(task *swarm.Task) {
 		task.NetworksAttachments = append(task.NetworksAttachments, swarm.NetworkAttachment{
 			Network: swarm.Network{

pkg/provider/docker/config.go

@@ -350,7 +350,6 @@ func (p Provider) getIPAddress(ctx context.Context, container dockerData) string
 		// the network specified on the current container.
 		containerParsed := parseContainer(containerInspected)
 		extraConf, err := p.getConfiguration(containerParsed)
-
 		if err != nil {
 			logger.Warnf("Unable to get IP address for container %s : failed to get extra configuration for container %s: %s", container.Name, containerInspected.Name, err)
 			return ""

pkg/provider/docker/label.go

@@ -55,7 +55,7 @@ func getStringMultipleStrict(labels map[string]string, labelNames ...string) (ma
 }
 
 // getStringValue get string value associated to a label.
-func getStringValue(labels map[string]string, labelName string, defaultValue string) string {
+func getStringValue(labels map[string]string, labelName, defaultValue string) string {
 	if value, ok := labels[labelName]; ok && len(value) > 0 {
 		return value
 	}

pkg/provider/file/file.go

@@ -49,7 +49,6 @@ func (p *Provider) Init() error {
 // using the given configuration channel.
 func (p *Provider) Provide(configurationChan chan<- dynamic.Message, pool *safe.Pool) error {
 	configuration, err := p.BuildConfiguration()
-
 	if err != nil {
 		return err
 	}
@@ -357,7 +356,7 @@ func (p *Provider) CreateConfiguration(ctx context.Context, filename string, fun
 		return nil, fmt.Errorf("error reading configuration file: %s - %w", filename, err)
 	}
 
-	var defaultFuncMap = sprig.TxtFuncMap()
+	defaultFuncMap := sprig.TxtFuncMap()
 	defaultFuncMap["normalize"] = provider.Normalize
 	defaultFuncMap["split"] = strings.Split
 	for funcID, funcElement := range funcMap {
@@ -377,7 +376,7 @@ func (p *Provider) CreateConfiguration(ctx context.Context, filename string, fun
 		return nil, err
 	}
 
-	var renderedTemplate = buffer.String()
+	renderedTemplate := buffer.String()
 	if p.DebugLogGeneratedTemplate {
 		logger := log.FromContext(ctx)
 		logger.Debugf("Template content: %s", tmplContent)
@@ -397,7 +396,7 @@ func (p *Provider) DecodeConfiguration(filename string) (*dynamic.Configuration,
 	return p.decodeConfiguration(filename, content)
 }
 
-func (p *Provider) decodeConfiguration(filePath string, content string) (*dynamic.Configuration, error) {
+func (p *Provider) decodeConfiguration(filePath, content string) (*dynamic.Configuration, error) {
 	configuration := &dynamic.Configuration{
 		HTTP: &dynamic.HTTPConfiguration{
 			Routers:     make(map[string]*dynamic.Router),

pkg/provider/file/file_test.go

@@ -292,7 +292,7 @@ func createTempDir(t *testing.T, dir string) string {
 }
 
 func copyFile(srcPath, dstPath string) error {
-	dst, err := os.OpenFile(dstPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0666)
+	dst, err := os.OpenFile(dstPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0o666)
 	if err != nil {
 		return err
 	}

pkg/provider/kubernetes/crd/generated/clientset/versioned/fake/register.go

@@ -35,12 +35,14 @@ import (
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 )
 
-var scheme = runtime.NewScheme()
+var (
-var codecs = serializer.NewCodecFactory(scheme)
+	scheme             = runtime.NewScheme()
-var parameterCodec = runtime.NewParameterCodec(scheme)
+	codecs             = serializer.NewCodecFactory(scheme)
-var localSchemeBuilder = runtime.SchemeBuilder{
+	parameterCodec     = runtime.NewParameterCodec(scheme)
-	traefikv1alpha1.AddToScheme,
+	localSchemeBuilder = runtime.SchemeBuilder{
-}
+		traefikv1alpha1.AddToScheme,
+	}
+)
 
 // AddToScheme adds all types of this clientset into the given scheme. This allows composition
 // of clientsets, like in:

pkg/provider/kubernetes/crd/generated/clientset/versioned/scheme/register.go

@@ -35,12 +35,14 @@ import (
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 )
 
-var Scheme = runtime.NewScheme()
+var (
-var Codecs = serializer.NewCodecFactory(Scheme)
+	Scheme             = runtime.NewScheme()
-var ParameterCodec = runtime.NewParameterCodec(Scheme)
+	Codecs             = serializer.NewCodecFactory(Scheme)
-var localSchemeBuilder = runtime.SchemeBuilder{
+	ParameterCodec     = runtime.NewParameterCodec(Scheme)
-	traefikv1alpha1.AddToScheme,
+	localSchemeBuilder = runtime.SchemeBuilder{
-}
+		traefikv1alpha1.AddToScheme,
+	}
+)
 
 // AddToScheme adds all types of this clientset into the given scheme. This allows composition
 // of clientsets, like in:

pkg/provider/kubernetes/crd/generated/clientset/versioned/typed/traefik/v1alpha1/fake/fake_ingressroute.go

@@ -83,7 +83,6 @@ func (c *FakeIngressRoutes) List(opts v1.ListOptions) (result *v1alpha1.IngressR
 func (c *FakeIngressRoutes) Watch(opts v1.ListOptions) (watch.Interface, error) {
 	return c.Fake.
 		InvokesWatch(testing.NewWatchAction(ingressroutesResource, c.ns, opts))
-
 }
 
 // Create takes the representation of a ingressRoute and creates it.  Returns the server's representation of the ingressRoute, and an error, if there is any.

pkg/provider/kubernetes/crd/generated/clientset/versioned/typed/traefik/v1alpha1/fake/fake_ingressroutetcp.go

@@ -83,7 +83,6 @@ func (c *FakeIngressRouteTCPs) List(opts v1.ListOptions) (result *v1alpha1.Ingre
 func (c *FakeIngressRouteTCPs) Watch(opts v1.ListOptions) (watch.Interface, error) {
 	return c.Fake.
 		InvokesWatch(testing.NewWatchAction(ingressroutetcpsResource, c.ns, opts))
-
 }
 
 // Create takes the representation of a ingressRouteTCP and creates it.  Returns the server's representation of the ingressRouteTCP, and an error, if there is any.

pkg/provider/kubernetes/crd/generated/clientset/versioned/typed/traefik/v1alpha1/fake/fake_ingressrouteudp.go

@@ -83,7 +83,6 @@ func (c *FakeIngressRouteUDPs) List(opts v1.ListOptions) (result *v1alpha1.Ingre
 func (c *FakeIngressRouteUDPs) Watch(opts v1.ListOptions) (watch.Interface, error) {
 	return c.Fake.
 		InvokesWatch(testing.NewWatchAction(ingressrouteudpsResource, c.ns, opts))
-
 }
 
 // Create takes the representation of a ingressRouteUDP and creates it.  Returns the server's representation of the ingressRouteUDP, and an error, if there is any.

pkg/provider/kubernetes/crd/generated/clientset/versioned/typed/traefik/v1alpha1/fake/fake_middleware.go

@@ -83,7 +83,6 @@ func (c *FakeMiddlewares) List(opts v1.ListOptions) (result *v1alpha1.Middleware
 func (c *FakeMiddlewares) Watch(opts v1.ListOptions) (watch.Interface, error) {
 	return c.Fake.
 		InvokesWatch(testing.NewWatchAction(middlewaresResource, c.ns, opts))
-
 }
 
 // Create takes the representation of a middleware and creates it.  Returns the server's representation of the middleware, and an error, if there is any.

pkg/provider/kubernetes/crd/generated/clientset/versioned/typed/traefik/v1alpha1/fake/fake_tlsoption.go

@@ -83,7 +83,6 @@ func (c *FakeTLSOptions) List(opts v1.ListOptions) (result *v1alpha1.TLSOptionLi
 func (c *FakeTLSOptions) Watch(opts v1.ListOptions) (watch.Interface, error) {
 	return c.Fake.
 		InvokesWatch(testing.NewWatchAction(tlsoptionsResource, c.ns, opts))
-
 }
 
 // Create takes the representation of a tLSOption and creates it.  Returns the server's representation of the tLSOption, and an error, if there is any.

pkg/provider/kubernetes/crd/generated/clientset/versioned/typed/traefik/v1alpha1/fake/fake_tlsstore.go

@@ -83,7 +83,6 @@ func (c *FakeTLSStores) List(opts v1.ListOptions) (result *v1alpha1.TLSStoreList
 func (c *FakeTLSStores) Watch(opts v1.ListOptions) (watch.Interface, error) {
 	return c.Fake.
 		InvokesWatch(testing.NewWatchAction(tlsstoresResource, c.ns, opts))
-
 }
 
 // Create takes the representation of a tLSStore and creates it.  Returns the server's representation of the tLSStore, and an error, if there is any.

pkg/provider/kubernetes/crd/generated/clientset/versioned/typed/traefik/v1alpha1/fake/fake_traefikservice.go

@@ -83,7 +83,6 @@ func (c *FakeTraefikServices) List(opts v1.ListOptions) (result *v1alpha1.Traefi
 func (c *FakeTraefikServices) Watch(opts v1.ListOptions) (watch.Interface, error) {
 	return c.Fake.
 		InvokesWatch(testing.NewWatchAction(traefikservicesResource, c.ns, opts))
-
 }
 
 // Create takes the representation of a traefikService and creates it.  Returns the server's representation of the traefikService, and an error, if there is any.

pkg/provider/kubernetes/crd/kubernetes.go

@@ -101,7 +101,6 @@ func (p *Provider) Provide(configurationChan chan<- dynamic.Message, pool *safe.
 	pool.GoCtx(func(ctxPool context.Context) {
 		operation := func() error {
 			eventsChan, err := k8sClient.WatchAll(p.Namespaces, ctxPool.Done())
-
 			if err != nil {
 				logger.Errorf("Error watching kubernetes events: %v", err)
 				timer := time.NewTimer(1 * time.Second)
@@ -627,7 +626,7 @@ func makeID(namespace, name string) string {
 	return namespace + "-" + name
 }
 
-func shouldProcessIngress(ingressClass string, ingressClassAnnotation string) bool {
+func shouldProcessIngress(ingressClass, ingressClassAnnotation string) bool {
 	return ingressClass == ingressClassAnnotation ||
 		(len(ingressClass) == 0 && ingressClassAnnotation == traefikDefaultIngressClass)
 }

pkg/provider/kubernetes/crd/kubernetes_http.go

@@ -432,7 +432,7 @@ func getTLSHTTP(ctx context.Context, ingressRoute *v1alpha1.IngressRoute, k8sCli
 
 // parseServiceProtocol parses the scheme, port name, and number to determine the correct protocol.
 // an error is returned if the scheme provided is invalid.
-func parseServiceProtocol(providedScheme string, portName string, portNumber int32) (string, error) {
+func parseServiceProtocol(providedScheme, portName string, portNumber int32) (string, error) {
 	switch providedScheme {
 	case httpProtocol, httpsProtocol, "h2c":
 		return providedScheme, nil

pkg/provider/kubernetes/crd/kubernetes_test.go

@@ -2940,7 +2940,8 @@ func TestLoadIngressRoutes(t *testing.T) {
 							EntryPoints: []string{"foo"},
 							Service:     "default-test-route-6f97418635c7e18853da",
 							Rule:        "Host(`foo.com`)",
-						}},
+						},
+					},
 					Middlewares: map[string]*dynamic.Middleware{},
 					Services: map[string]*dynamic.Service{
 						"default-test-route-6f97418635c7e18853da": {
@@ -2976,7 +2977,8 @@ func TestLoadIngressRoutes(t *testing.T) {
 							EntryPoints: []string{"foo"},
 							Service:     "default-test-route-6f97418635c7e18853da",
 							Rule:        "Host(`foo.com`)",
-						}},
+						},
+					},
 					Middlewares: map[string]*dynamic.Middleware{},
 					Services: map[string]*dynamic.Service{
 						"default-test-route-6f97418635c7e18853da": {
@@ -3012,7 +3014,8 @@ func TestLoadIngressRoutes(t *testing.T) {
 							EntryPoints: []string{"foo"},
 							Service:     "default-test-route-6f97418635c7e18853da",
 							Rule:        "Host(`foo.com`)",
-						}},
+						},
+					},
 					Middlewares: map[string]*dynamic.Middleware{},
 					Services: map[string]*dynamic.Service{
 						"default-test-route-6f97418635c7e18853da": {

pkg/provider/kubernetes/crd/kubernetes_udp.go

@@ -107,6 +107,7 @@ func loadUDPServers(client Client, namespace string, svc v1alpha1.ServiceUDP) ([
 
 	var portSpec *corev1.ServicePort
 	for _, p := range service.Spec.Ports {
+		p := p
 		if svc.Port == p.Port {
 			portSpec = &p
 			break

pkg/provider/kubernetes/ingress/kubernetes.go

@@ -319,7 +319,7 @@ func buildHostRule(host string) string {
 	return "Host(`" + host + "`)"
 }
 
-func shouldProcessIngress(ingressClass string, ingressClassAnnotation string) bool {
+func shouldProcessIngress(ingressClass, ingressClassAnnotation string) bool {
 	return ingressClass == ingressClassAnnotation ||
 		(len(ingressClass) == 0 && ingressClassAnnotation == traefikDefaultIngressClass)
 }

pkg/provider/marathon/mocks/Marathon.go

@@ -129,7 +129,7 @@ func (_m *Marathon) ApplicationBy(name string, opts *marathon.GetAppOpts) (*mara
 }
 
 // ApplicationByVersion provides a mock function with given fields: name, version
-func (_m *Marathon) ApplicationByVersion(name string, version string) (*marathon.Application, error) {
+func (_m *Marathon) ApplicationByVersion(name, version string) (*marathon.Application, error) {
 	ret := _m.Called(name, version)
 
 	var r0 *marathon.Application
@@ -394,7 +394,7 @@ func (_m *Marathon) DeletePod(name string, force bool) (*marathon.DeploymentID,
 }
 
 // DeletePodInstance provides a mock function with given fields: name, instance
-func (_m *Marathon) DeletePodInstance(name string, instance string) (*marathon.PodInstance, error) {
+func (_m *Marathon) DeletePodInstance(name, instance string) (*marathon.PodInstance, error) {
 	ret := _m.Called(name, instance)
 
 	var r0 *marathon.PodInstance
@@ -583,7 +583,7 @@ func (_m *Marathon) GroupsBy(opts *marathon.GetGroupOpts) (*marathon.Groups, err
 }
 
 // HasApplicationVersion provides a mock function with given fields: name, version
-func (_m *Marathon) HasApplicationVersion(name string, version string) (bool, error) {
+func (_m *Marathon) HasApplicationVersion(name, version string) (bool, error) {
 	ret := _m.Called(name, version)
 
 	var r0 bool
@@ -817,7 +817,7 @@ func (_m *Marathon) Pod(name string) (*marathon.Pod, error) {
 }
 
 // PodByVersion provides a mock function with given fields: name, version
-func (_m *Marathon) PodByVersion(name string, version string) (*marathon.Pod, error) {
+func (_m *Marathon) PodByVersion(name, version string) (*marathon.Pod, error) {
 	ret := _m.Called(name, version)
 
 	var r0 *marathon.Pod

pkg/provider/traefik/internal_test.go

@@ -209,7 +209,8 @@ func Test_createConfiguration(t *testing.T) {
 					},
 				},
 			},
-		}, {
+		},
+		{
 			desc: "redirection_port.json",
 			staticCfg: static.Configuration{
 				EntryPoints: map[string]*static.EntryPoint{
@@ -248,7 +249,7 @@ func Test_createConfiguration(t *testing.T) {
 				newJSON, err := json.MarshalIndent(cfg, "", "  ")
 				require.NoError(t, err)
 
-				err = ioutil.WriteFile(filename, newJSON, 0644)
+				err = ioutil.WriteFile(filename, newJSON, 0o644)
 				require.NoError(t, err)
 			}
 

pkg/responsemodifiers/log.go

@@ -8,6 +8,6 @@ import (
 )
 
 // getLogger creates a logger configured with the middleware fields.
-func getLogger(ctx context.Context, middleware string, middlewareType string) logrus.FieldLogger {
+func getLogger(ctx context.Context, middleware, middlewareType string) logrus.FieldLogger {
 	return log.FromContext(ctx).WithField(log.MiddlewareName, middleware).WithField(log.MiddlewareType, middlewareType)
 }

pkg/server/cookie/cookie.go

@@ -11,7 +11,7 @@ import (
 const cookieNameLength = 6
 
 // GetName of a cookie.
-func GetName(cookieName string, backendName string) string {
+func GetName(cookieName, backendName string) string {
 	if len(cookieName) != 0 {
 		return sanitizeName(cookieName)
 	}

pkg/server/provider/provider.go

@@ -40,6 +40,6 @@ func GetQualifiedName(ctx context.Context, elementName string) string {
 }
 
 // MakeQualifiedName Creates a qualified name for an element.
-func MakeQualifiedName(providerName string, elementName string) string {
+func MakeQualifiedName(providerName, elementName string) string {
 	return elementName + "@" + providerName
 }

pkg/server/router/tcp/router.go

@@ -90,7 +90,7 @@ type nameAndConfig struct {
 	TLSConfig  *tls.Config
 }
 
-func (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string]*runtime.TCPRouterInfo, configsHTTP map[string]*runtime.RouterInfo, handlerHTTP http.Handler, handlerHTTPS http.Handler) (*tcp.Router, error) {
+func (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string]*runtime.TCPRouterInfo, configsHTTP map[string]*runtime.RouterInfo, handlerHTTP, handlerHTTPS http.Handler) (*tcp.Router, error) {
 	router := &tcp.Router{}
 	router.HTTPHandler(handlerHTTP)
 

pkg/server/server_entrypoint_tcp.go

@@ -379,7 +379,6 @@ func buildProxyProtocolListener(ctx context.Context, entryPoint *static.EntryPoi
 
 func buildListener(ctx context.Context, entryPoint *static.EntryPoint) (net.Listener, error) {
 	listener, err := net.Listen("tcp", entryPoint.GetAddress())
-
 	if err != nil {
 		return nil, fmt.Errorf("error opening listener: %w", err)
 	}

pkg/server/service/internalhandler.go

@@ -27,7 +27,7 @@ type InternalHandlers struct {
 }
 
 // NewInternalHandlers creates a new InternalHandlers.
-func NewInternalHandlers(api func(configuration *runtime.Configuration) http.Handler, configuration *runtime.Configuration, rest http.Handler, metricsHandler http.Handler, pingHandler http.Handler, dashboard http.Handler, next serviceManager) *InternalHandlers {
+func NewInternalHandlers(api func(configuration *runtime.Configuration) http.Handler, configuration *runtime.Configuration, rest, metricsHandler, pingHandler, dashboard http.Handler, next serviceManager) *InternalHandlers {
 	var apiHandler http.Handler
 	if api != nil {
 		apiHandler = api(configuration)

pkg/server/service/proxy_websocket_test.go

@@ -63,7 +63,7 @@ func TestWebSocketPingPong(t *testing.T) {
 
 	require.NoError(t, err)
 
-	var upgrader = gorillawebsocket.Upgrader{
+	upgrader := gorillawebsocket.Upgrader{
 		HandshakeTimeout: 10 * time.Second,
 		CheckOrigin: func(*http.Request) bool {
 			return true
@@ -670,7 +670,7 @@ func (w *websocketRequest) send() (string, error) {
 	if _, err := conn.Write([]byte(w.Data)); err != nil {
 		return "", err
 	}
-	var msg = make([]byte, 512)
+	msg := make([]byte, 512)
 	var n int
 	n, err = conn.Read(msg)
 	if err != nil {

pkg/tls/certificate_store.go

@@ -118,7 +118,7 @@ func (c CertificateStore) ResetCache() {
 }
 
 // MatchDomain return true if a domain match the cert domain.
-func MatchDomain(domain string, certDomain string) bool {
+func MatchDomain(domain, certDomain string) bool {
 	if domain == certDomain {
 		return true
 	}

pkg/tls/tlsmanager.go

@@ -81,7 +81,7 @@ func (m *Manager) UpdateConfigs(ctx context.Context, stores map[string]Store, co
 }
 
 // Get gets the TLS configuration to use for a given store / configuration.
-func (m *Manager) Get(storeName string, configName string) (*tls.Config, error) {
+func (m *Manager) Get(storeName, configName string) (*tls.Config, error) {
 	m.lock.RLock()
 	defer m.lock.RUnlock()
 

pkg/tracing/tracing.go

@@ -80,12 +80,12 @@ func (t *Tracing) StartSpanf(r *http.Request, spanKind ext.SpanKindEnum, opPrefi
 }
 
 // Inject delegates to opentracing.Tracer.
-func (t *Tracing) Inject(sm opentracing.SpanContext, format interface{}, carrier interface{}) error {
+func (t *Tracing) Inject(sm opentracing.SpanContext, format, carrier interface{}) error {
 	return t.tracer.Inject(sm, format, carrier)
 }
 
 // Extract delegates to opentracing.Tracer.
-func (t *Tracing) Extract(format interface{}, carrier interface{}) (opentracing.SpanContext, error) {
+func (t *Tracing) Extract(format, carrier interface{}) (opentracing.SpanContext, error) {
 	return t.tracer.Extract(format, carrier)
 }
 

pkg/types/domains.go

@@ -30,7 +30,7 @@ func (d *Domain) Set(domains []string) {
 }
 
 // MatchDomain returns true if a domain match the cert domain.
-func MatchDomain(domain string, certDomain string) bool {
+func MatchDomain(domain, certDomain string) bool {
 	if domain == certDomain {
 		return true
 	}

pkg/types/logs.go

@@ -113,7 +113,7 @@ func checkFieldValue(value string, defaultKeep bool) bool {
 	}
 }
 
-func checkFieldHeaderValue(value string, defaultValue string) string {
+func checkFieldHeaderValue(value, defaultValue string) string {
 	if value == AccessLogKeep || value == AccessLogDrop || value == AccessLogRedact {
 		return value
 	}

pkg/version/version.go

@@ -24,11 +24,9 @@ var (
 // Handler expose version routes.
 type Handler struct{}
 
-var (
+var templatesRenderer = render.New(render.Options{
-	templatesRenderer = render.New(render.Options{
+	Directory: "nowhere",
-		Directory: "nowhere",
+})
-	})
-)
 
 // Append adds version routes on a router.
 func (v Handler) Append(router *mux.Router) {