chore: update linter

.github/workflows/validate.yaml

@@ -7,7 +7,7 @@ on:
 
 env:
   GO_VERSION: '1.21'
-  GOLANGCI_LINT_VERSION: v1.54.1
+  GOLANGCI_LINT_VERSION: v1.55.2
   MISSSPELL_VERSION: v0.4.0
   IN_DOCKER: ""
 

.golangci.yml

@@ -151,6 +151,19 @@ linters-settings:
       - github.com/mailgun/minheap
       - github.com/mailgun/multibuf
       - github.com/jaguilar/vt100
+  testifylint:
+    enable:
+      - bool-compare
+      - compares
+      - empty
+      - error-is-as
+      - error-nil
+      - expected-actual
+      - float-compare
+      - len
+      - suite-dont-use-pkg
+      - suite-extra-assert-call
+      - suite-thelper
 
 linters:
   enable-all: true

.semaphore/semaphore.yml

@@ -25,7 +25,7 @@ global_job_config:
       - export "PATH=${GOPATH}/bin:${PATH}"
       - mkdir -vp "${SEMAPHORE_GIT_DIR}" "${GOPATH}/bin"
       - export GOPROXY=https://proxy.golang.org,direct
-      - curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b "${GOPATH}/bin" v1.54.1
+      - curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b "${GOPATH}/bin" v1.55.2
       - curl -sSfL https://gist.githubusercontent.com/traefiker/6d7ac019c11d011e4f131bb2cca8900e/raw/goreleaser.sh | bash -s -- -b "${GOPATH}/bin"
       - checkout
       - cache restore traefik-$(checksum go.sum)

build.Dockerfile

@@ -13,7 +13,7 @@ RUN mkdir -p /usr/local/bin \
     | tar -xzC /usr/local/bin --transform 's#^.+/##x'
 
 # Download golangci-lint binary to bin folder in $GOPATH
-RUN curl -sfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | bash -s -- -b $GOPATH/bin v1.54.1
+RUN curl -sfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | bash -s -- -b $GOPATH/bin v1.55.2
 
 # Download misspell binary to bin folder in $GOPATH
 RUN curl -sfL https://raw.githubusercontent.com/golangci/misspell/master/install-misspell.sh | bash -s -- -b $GOPATH/bin v0.4.0

integration/access_log_test.go

@@ -3,6 +3,7 @@ package integration
 import (
 	"crypto/md5"
 	"crypto/rand"
+	"encoding/hex"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -265,7 +266,8 @@ func getMD5(data string) string {
 	if _, err := digest.Write([]byte(data)); err != nil {
 		log.WithoutContext().Error(err)
 	}
-	return fmt.Sprintf("%x", digest.Sum(nil))
+
+	return hex.EncodeToString(digest.Sum(nil))
 }
 
 func getCnonce() string {
@@ -273,7 +275,8 @@ func getCnonce() string {
 	if _, err := io.ReadFull(rand.Reader, b); err != nil {
 		log.WithoutContext().Error(err)
 	}
-	return fmt.Sprintf("%x", b)[:16]
+
+	return hex.EncodeToString(b)[:16]
 }
 
 func getDigestAuthorization(digestParts map[string]string) string {

integration/grpc_test.go

@@ -42,7 +42,7 @@ func (s *GRPCSuite) SetUpSuite(c *check.C) {
 }
 
 func (s *myserver) SayHello(ctx context.Context, in *helloworld.HelloRequest) (*helloworld.HelloReply, error) {
-	return &helloworld.HelloReply{Message: "Hello " + in.Name}, nil
+	return &helloworld.HelloReply{Message: "Hello " + in.GetName()}, nil
 }
 
 func (s *myserver) StreamExample(in *helloworld.StreamExampleRequest, server helloworld.Greeter_StreamExampleServer) error {
@@ -121,7 +121,7 @@ func callHelloClientGRPC(name string, secure bool) (string, error) {
 	if err != nil {
 		return "", err
 	}
-	return r.Message, nil
+	return r.GetMessage(), nil
 }
 
 func callStreamExampleClientGRPC() (helloworld.Greeter_StreamExampleClient, func() error, error) {
@@ -351,7 +351,7 @@ func (s *GRPCSuite) TestGRPCBuffer(c *check.C) {
 	go func() {
 		tr, err := client.Recv()
 		c.Assert(err, check.IsNil)
-		c.Assert(len(tr.Data), check.Equals, 512)
+		c.Assert(len(tr.GetData()), check.Equals, 512)
 		received <- true
 	}()
 
@@ -414,7 +414,7 @@ func (s *GRPCSuite) TestGRPCBufferWithFlushInterval(c *check.C) {
 	go func() {
 		tr, err := client.Recv()
 		c.Assert(err, check.IsNil)
-		c.Assert(len(tr.Data), check.Equals, 512)
+		c.Assert(len(tr.GetData()), check.Equals, 512)
 		received <- true
 	}()
 

pkg/api/handler_entrypoint_test.go

@@ -212,7 +212,7 @@ func TestHandler_EntryPoints(t *testing.T) {
 				return
 			}
 
-			assert.Equal(t, resp.Header.Get("Content-Type"), "application/json")
+			assert.Equal(t, "application/json", resp.Header.Get("Content-Type"))
 			contents, err := io.ReadAll(resp.Body)
 			require.NoError(t, err)
 

pkg/api/handler_http_test.go

@@ -873,7 +873,7 @@ func TestHandler_HTTP(t *testing.T) {
 				return
 			}
 
-			assert.Equal(t, resp.Header.Get("Content-Type"), "application/json")
+			assert.Equal(t, "application/json", resp.Header.Get("Content-Type"))
 			contents, err := io.ReadAll(resp.Body)
 			require.NoError(t, err)
 

pkg/api/handler_overview_test.go

@@ -291,7 +291,7 @@ func TestHandler_Overview(t *testing.T) {
 				return
 			}
 
-			assert.Equal(t, resp.Header.Get("Content-Type"), "application/json")
+			assert.Equal(t, "application/json", resp.Header.Get("Content-Type"))
 			contents, err := io.ReadAll(resp.Body)
 			require.NoError(t, err)
 

pkg/api/handler_tcp_test.go

@@ -750,7 +750,7 @@ func TestHandler_TCP(t *testing.T) {
 				return
 			}
 
-			assert.Equal(t, resp.Header.Get("Content-Type"), "application/json")
+			assert.Equal(t, "application/json", resp.Header.Get("Content-Type"))
 
 			contents, err := io.ReadAll(resp.Body)
 			require.NoError(t, err)

pkg/api/handler_test.go

@@ -143,7 +143,7 @@ func TestHandler_RawData(t *testing.T) {
 			require.NoError(t, err)
 
 			assert.Equal(t, test.expected.statusCode, resp.StatusCode)
-			assert.Equal(t, resp.Header.Get("Content-Type"), "application/json")
+			assert.Equal(t, "application/json", resp.Header.Get("Content-Type"))
 
 			contents, err := io.ReadAll(resp.Body)
 			require.NoError(t, err)

pkg/api/handler_udp_test.go

@@ -510,7 +510,7 @@ func TestHandler_UDP(t *testing.T) {
 				return
 			}
 
-			assert.Equal(t, resp.Header.Get("Content-Type"), "application/json")
+			assert.Equal(t, "application/json", resp.Header.Get("Content-Type"))
 
 			contents, err := io.ReadAll(resp.Body)
 			require.NoError(t, err)

pkg/healthcheck/healthcheck_test.go

@@ -21,6 +21,8 @@ const (
 	healthCheckTimeout  = 100 * time.Millisecond
 )
 
+const delta float64 = 1e-10
+
 type testHandler struct {
 	done           func()
 	healthSequence []int
@@ -149,7 +151,7 @@ func TestSetBackendsConfiguration(t *testing.T) {
 
 			assert.Equal(t, test.expectedNumRemovedServers, lb.numRemovedServers, "removed servers")
 			assert.Equal(t, test.expectedNumUpsertedServers, lb.numUpsertedServers, "upserted servers")
-			assert.Equal(t, test.expectedGaugeValue, collectingMetrics.GaugeValue, "ServerUp Gauge")
+			assert.InDelta(t, test.expectedGaugeValue, collectingMetrics.GaugeValue, delta, "ServerUp Gauge")
 		})
 	}
 }
@@ -402,7 +404,7 @@ func TestBalancers_Servers(t *testing.T) {
 	want, err := url.Parse("http://foo.com")
 	require.NoError(t, err)
 
-	assert.Equal(t, 1, len(balancers.Servers()))
+	assert.Len(t, balancers.Servers(), 1)
 	assert.Equal(t, want, balancers.Servers()[0])
 }
 
@@ -421,10 +423,10 @@ func TestBalancers_UpsertServer(t *testing.T) {
 	err = balancers.UpsertServer(want)
 	require.NoError(t, err)
 
-	assert.Equal(t, 1, len(balancer1.Servers()))
+	assert.Len(t, balancer1.Servers(), 1)
 	assert.Equal(t, want, balancer1.Servers()[0])
 
-	assert.Equal(t, 1, len(balancer2.Servers()))
+	assert.Len(t, balancer2.Servers(), 1)
 	assert.Equal(t, want, balancer2.Servers()[0])
 }
 
@@ -449,8 +451,8 @@ func TestBalancers_RemoveServer(t *testing.T) {
 	err = balancers.RemoveServer(server)
 	require.NoError(t, err)
 
-	assert.Equal(t, 0, len(balancer1.Servers()))
-	assert.Equal(t, 0, len(balancer2.Servers()))
+	assert.Empty(t, balancer1.Servers())
+	assert.Empty(t, balancer2.Servers())
 }
 
 type testLoadBalancer struct {
@@ -541,23 +543,23 @@ func TestLBStatusUpdater(t *testing.T) {
 	assert.NoError(t, err)
 	err = lbsu.UpsertServer(newServer, roundrobin.Weight(1))
 	assert.NoError(t, err)
-	assert.Equal(t, len(lbsu.Servers()), 1)
-	assert.Equal(t, len(lbsu.BalancerHandler.(*testLoadBalancer).Options()), 1)
+	assert.Len(t, lbsu.Servers(), 1)
+	assert.Len(t, lbsu.BalancerHandler.(*testLoadBalancer).Options(), 1)
 	statuses := svInfo.GetAllStatus()
-	assert.Equal(t, len(statuses), 1)
+	assert.Len(t, statuses, 1)
 	for k, v := range statuses {
-		assert.Equal(t, k, newServer.String())
-		assert.Equal(t, v, serverUp)
+		assert.Equal(t, newServer.String(), k)
+		assert.Equal(t, serverUp, v)
 		break
 	}
 	err = lbsu.RemoveServer(newServer)
 	assert.NoError(t, err)
-	assert.Equal(t, len(lbsu.Servers()), 0)
+	assert.Empty(t, lbsu.Servers())
 	statuses = svInfo.GetAllStatus()
-	assert.Equal(t, len(statuses), 1)
+	assert.Len(t, statuses, 1)
 	for k, v := range statuses {
-		assert.Equal(t, k, newServer.String())
-		assert.Equal(t, v, serverDown)
+		assert.Equal(t, newServer.String(), k)
+		assert.Equal(t, serverDown, v)
 		break
 	}
 }

pkg/log/log.go

@@ -18,7 +18,7 @@ const (
 // Logger the Traefik logger.
 type Logger interface {
 	logrus.FieldLogger
-	WriterLevel(logrus.Level) *io.PipeWriter
+	WriterLevel(level logrus.Level) *io.PipeWriter
 }
 
 var (

pkg/metrics/prometheus_test.go

@@ -427,12 +427,12 @@ func TestPrometheus(t *testing.T) {
 				return
 			}
 
-			for _, label := range family.Metric[0].Label {
-				val, ok := test.labels[*label.Name]
+			for _, label := range family.GetMetric()[0].GetLabel() {
+				val, ok := test.labels[label.GetName()]
 				if !ok {
-					t.Errorf("%q metric contains unexpected label %q", test.name, *label.Name)
-				} else if val != *label.Value {
-					t.Errorf("label %q in metric %q has wrong value %q, expected %q", *label.Name, test.name, *label.Value, val)
+					t.Errorf("%q metric contains unexpected label %q", test.name, label.GetName())
+				} else if val != label.GetValue() {
+					t.Errorf("label %q in metric %q has wrong value %q, expected %q", label.GetName(), test.name, label.GetValue(), val)
 				}
 			}
 			test.assert(family)
@@ -683,7 +683,7 @@ func findMetricByLabelNamesValues(family *dto.MetricFamily, labelNamesValues ...
 		return nil
 	}
 
-	for _, metric := range family.Metric {
+	for _, metric := range family.GetMetric() {
 		if hasMetricAllLabelPairs(metric, labelNamesValues...) {
 			return metric
 		}
@@ -703,7 +703,7 @@ func hasMetricAllLabelPairs(metric *dto.Metric, labelNamesValues ...string) bool
 }
 
 func hasMetricLabelPair(metric *dto.Metric, labelName, labelValue string) bool {
-	for _, labelPair := range metric.Label {
+	for _, labelPair := range metric.GetLabel() {
 		if labelPair.GetName() == labelName && labelPair.GetValue() == labelValue {
 			return true
 		}
@@ -720,12 +720,12 @@ func assertCounterValue(t *testing.T, want float64, family *dto.MetricFamily, la
 		t.Error("metric must not be nil")
 		return
 	}
-	if metric.Counter == nil {
+	if metric.GetCounter() == nil {
 		t.Errorf("metric %s must be a counter", family.GetName())
 		return
 	}
 
-	if cv := metric.Counter.GetValue(); cv != want {
+	if cv := metric.GetCounter().GetValue(); cv != want {
 		t.Errorf("metric %s has value %v, want %v", family.GetName(), cv, want)
 	}
 }
@@ -734,7 +734,7 @@ func buildCounterAssert(t *testing.T, metricName string, expectedValue int) func
 	t.Helper()
 
 	return func(family *dto.MetricFamily) {
-		if cv := int(family.Metric[0].Counter.GetValue()); cv != expectedValue {
+		if cv := int(family.GetMetric()[0].GetCounter().GetValue()); cv != expectedValue {
 			t.Errorf("metric %s has value %d, want %d", metricName, cv, expectedValue)
 		}
 	}
@@ -744,7 +744,7 @@ func buildGreaterThanCounterAssert(t *testing.T, metricName string, expectedMinV
 	t.Helper()
 
 	return func(family *dto.MetricFamily) {
-		if cv := int(family.Metric[0].Counter.GetValue()); cv < expectedMinValue {
+		if cv := int(family.GetMetric()[0].GetCounter().GetValue()); cv < expectedMinValue {
 			t.Errorf("metric %s has value %d, want at least %d", metricName, cv, expectedMinValue)
 		}
 	}
@@ -754,7 +754,7 @@ func buildHistogramAssert(t *testing.T, metricName string, expectedSampleCount i
 	t.Helper()
 
 	return func(family *dto.MetricFamily) {
-		if sc := int(family.Metric[0].Histogram.GetSampleCount()); sc != expectedSampleCount {
+		if sc := int(family.GetMetric()[0].GetHistogram().GetSampleCount()); sc != expectedSampleCount {
 			t.Errorf("metric %s has sample count value %d, want %d", metricName, sc, expectedSampleCount)
 		}
 	}
@@ -764,7 +764,7 @@ func buildGaugeAssert(t *testing.T, metricName string, expectedValue int) func(f
 	t.Helper()
 
 	return func(family *dto.MetricFamily) {
-		if gv := int(family.Metric[0].Gauge.GetValue()); gv != expectedValue {
+		if gv := int(family.GetMetric()[0].GetGauge().GetValue()); gv != expectedValue {
 			t.Errorf("metric %s has value %d, want %d", metricName, gv, expectedValue)
 		}
 	}
@@ -774,7 +774,7 @@ func buildTimestampAssert(t *testing.T, metricName string) func(family *dto.Metr
 	t.Helper()
 
 	return func(family *dto.MetricFamily) {
-		if ts := time.Unix(int64(family.Metric[0].Gauge.GetValue()), 0); time.Since(ts) > time.Minute {
+		if ts := time.Unix(int64(family.GetMetric()[0].GetGauge().GetValue()), 0); time.Since(ts) > time.Minute {
 			t.Errorf("metric %s has wrong timestamp %v", metricName, ts)
 		}
 	}

pkg/middlewares/accesslog/logger_test.go

@@ -12,6 +12,7 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
+	"strconv"
 	"strings"
 	"testing"
 	"time"
@@ -321,7 +322,7 @@ func TestLoggerJSON(t *testing.T) {
 				ServiceURL:                assertString(testServiceName),
 				ClientUsername:            assertString(testUsername),
 				ClientHost:                assertString(testHostname),
-				ClientPort:                assertString(fmt.Sprintf("%d", testPort)),
+				ClientPort:                assertString(strconv.Itoa(testPort)),
 				ClientAddr:                assertString(fmt.Sprintf("%s:%d", testHostname, testPort)),
 				"level":                   assertString("info"),
 				"msg":                     assertString(""),
@@ -361,7 +362,7 @@ func TestLoggerJSON(t *testing.T) {
 				ServiceURL:                assertString(testServiceName),
 				ClientUsername:            assertString(testUsername),
 				ClientHost:                assertString(testHostname),
-				ClientPort:                assertString(fmt.Sprintf("%d", testPort)),
+				ClientPort:                assertString(strconv.Itoa(testPort)),
 				ClientAddr:                assertString(fmt.Sprintf("%s:%d", testHostname, testPort)),
 				"level":                   assertString("info"),
 				"msg":                     assertString(""),

pkg/middlewares/auth/digest_auth_request_test.go

@@ -137,5 +137,5 @@ func (r *digestRequest) makeAuthorization(req *http.Request, parts map[string]st
 func generateRandom(n int) string {
 	b := make([]byte, 8)
 	_, _ = io.ReadFull(rand.Reader, b)
-	return fmt.Sprintf("%x", b)[:n]
+	return hex.EncodeToString(b)[:n]
 }

pkg/middlewares/capture/capture_test.go

@@ -165,7 +165,7 @@ func runBenchmark(b *testing.B, size int, req *http.Request, handler http.Handle
 		b.Fatalf("Expected 200 but got %d", code)
 	}
 
-	assert.Equal(b, size, len(recorder.Body.String()))
+	assert.Len(b, recorder.Body.String(), size)
 }
 
 func generateBytes(length int) []byte {

pkg/middlewares/compress/compress_test.go

@@ -424,7 +424,7 @@ func Test1xxResponses(t *testing.T) {
 	req.Header.Add(acceptEncodingHeader, gzipValue)
 
 	res, err := frontendClient.Do(req)
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	defer res.Body.Close()
 

pkg/middlewares/customerrors/custom_errors_test.go

@@ -253,7 +253,7 @@ func Test1xxResponses(t *testing.T) {
 	req, _ := http.NewRequestWithContext(httptrace.WithClientTrace(context.Background(), trace), http.MethodGet, server.URL, nil)
 
 	res, err := frontendClient.Do(req)
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	defer res.Body.Close()
 

pkg/middlewares/headers/headers_test.go

@@ -182,7 +182,7 @@ func Test1xxResponses(t *testing.T) {
 	req, _ := http.NewRequestWithContext(httptrace.WithClientTrace(context.Background(), trace), http.MethodGet, server.URL, nil)
 
 	res, err := frontendClient.Do(req)
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	defer res.Body.Close()
 

pkg/middlewares/pipelining/pipelining_test.go

@@ -134,7 +134,7 @@ func Test1xxResponses(t *testing.T) {
 	req, _ := http.NewRequestWithContext(httptrace.WithClientTrace(context.Background(), trace), http.MethodGet, server.URL, nil)
 
 	res, err := frontendClient.Do(req)
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	defer res.Body.Close()
 

pkg/middlewares/ratelimiter/rate_limiter_test.go

@@ -18,6 +18,8 @@ import (
 	"golang.org/x/time/rate"
 )
 
+const delta float64 = 1e-10
+
 func TestNewRateLimiter(t *testing.T) {
 	testCases := []struct {
 		desc             string
@@ -131,7 +133,7 @@ func TestNewRateLimiter(t *testing.T) {
 				assert.Equal(t, test.requestHeader, hd)
 			}
 			if test.expectedRTL != 0 {
-				assert.Equal(t, test.expectedRTL, rtl.rate)
+				assert.InDelta(t, float64(test.expectedRTL), float64(rtl.rate), delta)
 			}
 		})
 	}

pkg/middlewares/retry/retry_test.go

@@ -373,7 +373,7 @@ func Test1xxResponses(t *testing.T) {
 	req, _ := http.NewRequestWithContext(httptrace.WithClientTrace(context.Background(), trace), http.MethodGet, server.URL, nil)
 
 	res, err := frontendClient.Do(req)
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	defer res.Body.Close()
 

pkg/middlewares/tracing/forwarder_test.go

@@ -123,7 +123,7 @@ func TestNewForwarder(t *testing.T) {
 
 				tags := span.Tags
 				assert.Equal(t, test.expected.Tags, tags)
-				assert.True(t, len(test.expected.OperationName) <= test.spanNameLimit,
+				assert.LessOrEqual(t, len(test.expected.OperationName), test.spanNameLimit,
 					"the len of the operation name %q [len: %d] doesn't respect limit %d",
 					test.expected.OperationName, len(test.expected.OperationName), test.spanNameLimit)
 				assert.Equal(t, test.expected.OperationName, span.OpName)

pkg/muxer/tcp/mux_test.go

@@ -548,7 +548,7 @@ func Test_addTCPRoute(t *testing.T) {
 			matchingHandler.ServeTCP(conn)
 
 			n, ok := conn.call[msg]
-			assert.Equal(t, n, 1)
+			assert.Equal(t, 1, n)
 			assert.True(t, ok)
 		})
 	}

pkg/plugins/client.go

@@ -4,6 +4,7 @@ import (
 	zipa "archive/zip"
 	"context"
 	"crypto/sha256"
+	"encoding/hex"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -423,5 +424,5 @@ func computeHash(filepath string) (string, error) {
 
 	sum := hash.Sum(nil)
 
-	return fmt.Sprintf("%x", sum), nil
+	return hex.EncodeToString(sum), nil
 }

pkg/provider/acme/provider.go

@@ -30,6 +30,8 @@ import (
 	"github.com/traefik/traefik/v2/pkg/version"
 )
 
+const resolverSuffix = ".acme"
+
 // ocspMustStaple enables OCSP stapling as from https://github.com/go-acme/lego/issues/270.
 var ocspMustStaple = false
 
@@ -131,7 +133,7 @@ func (p *Provider) ListenConfiguration(config dynamic.Configuration) {
 
 // Init for compatibility reason the BaseProvider implements an empty Init.
 func (p *Provider) Init() error {
-	ctx := log.With(context.Background(), log.Str(log.ProviderName, p.ResolverName+".acme"))
+	ctx := log.With(context.Background(), log.Str(log.ProviderName, p.ResolverName+resolverSuffix))
 	logger := log.FromContext(ctx)
 
 	if len(p.Configuration.Storage) == 0 {
@@ -195,7 +197,7 @@ func (p *Provider) ThrottleDuration() time.Duration {
 // using the given Configuration channel.
 func (p *Provider) Provide(configurationChan chan<- dynamic.Message, pool *safe.Pool) error {
 	ctx := log.With(context.Background(),
-		log.Str(log.ProviderName, p.ResolverName+".acme"),
+		log.Str(log.ProviderName, p.ResolverName+resolverSuffix),
 		log.Str("ACME CA", p.Configuration.CAServer))
 
 	p.pool = pool
@@ -236,7 +238,7 @@ func (p *Provider) getClient() (*lego.Client, error) {
 	p.clientMutex.Lock()
 	defer p.clientMutex.Unlock()
 
-	ctx := log.With(context.Background(), log.Str(log.ProviderName, p.ResolverName+".acme"))
+	ctx := log.With(context.Background(), log.Str(log.ProviderName, p.ResolverName+resolverSuffix))
 	logger := log.FromContext(ctx)
 
 	if p.client != nil {
@@ -406,7 +408,7 @@ func (p *Provider) resolveDomains(ctx context.Context, domains []string, tlsStor
 }
 
 func (p *Provider) watchNewDomains(ctx context.Context) {
-	ctx = log.With(ctx, log.Str(log.ProviderName, p.ResolverName+".acme"))
+	ctx = log.With(ctx, log.Str(log.ProviderName, p.ResolverName+resolverSuffix))
 	p.pool.GoCtx(func(ctxPool context.Context) {
 		for {
 			select {
@@ -765,7 +767,7 @@ func deleteUnnecessaryDomains(ctx context.Context, domains []types.Domain) []typ
 
 func (p *Provider) buildMessage() dynamic.Message {
 	conf := dynamic.Message{
-		ProviderName: p.ResolverName + ".acme",
+		ProviderName: p.ResolverName + resolverSuffix,
 		Configuration: &dynamic.Configuration{
 			HTTP: &dynamic.HTTPConfiguration{
 				Routers:     map[string]*dynamic.Router{},

pkg/provider/acme/provider_test.go

@@ -580,7 +580,7 @@ func TestInitAccount(t *testing.T) {
 			acmeProvider := Provider{account: test.account, Configuration: &Configuration{Email: test.email, KeyType: test.keyType}}
 
 			actualAccount, err := acmeProvider.initAccount(context.Background())
-			assert.Nil(t, err, "Init account in error")
+			assert.NoError(t, err, "Init account in error")
 			assert.Equal(t, test.expectedAccount.Email, actualAccount.Email, "unexpected email account")
 			assert.Equal(t, test.expectedAccount.KeyType, actualAccount.KeyType, "unexpected keyType account")
 		})

pkg/provider/acme/store.go

@@ -8,8 +8,8 @@ type StoredData struct {
 
 // Store is a generic interface that represents a storage.
 type Store interface {
-	GetAccount(string) (*Account, error)
-	SaveAccount(string, *Account) error
-	GetCertificates(string) ([]*CertAndStore, error)
-	SaveCertificates(string, []*CertAndStore) error
+	GetAccount(resolverName string) (*Account, error)
+	SaveAccount(resolverName string, account *Account) error
+	GetCertificates(resolverName string) ([]*CertAndStore, error)
+	SaveCertificates(resolverName string, certificates []*CertAndStore) error
 }

pkg/provider/file/file_test.go

@@ -145,10 +145,10 @@ func TestProvideWithWatch(t *testing.T) {
 				require.NotNil(t, conf.Configuration.HTTP)
 				numServices := len(conf.Configuration.HTTP.Services) + len(conf.Configuration.TCP.Services) + len(conf.Configuration.UDP.Services)
 				numRouters := len(conf.Configuration.HTTP.Routers) + len(conf.Configuration.TCP.Routers) + len(conf.Configuration.UDP.Routers)
-				assert.Equal(t, numServices, 0)
-				assert.Equal(t, numRouters, 0)
+				assert.Equal(t, 0, numServices)
+				assert.Equal(t, 0, numRouters)
 				require.NotNil(t, conf.Configuration.TLS)
-				assert.Len(t, conf.Configuration.TLS.Certificates, 0)
+				assert.Empty(t, conf.Configuration.TLS.Certificates)
 			case <-timeout:
 				t.Errorf("timeout while waiting for config")
 			}

pkg/provider/http/http_test.go

@@ -251,5 +251,5 @@ func TestProvider_ProvideConfigurationOnlyOnceIfUnchanged(t *testing.T) {
 
 	time.Sleep(time.Second)
 
-	assert.Equal(t, 1, len(configurationChan))
+	assert.Len(t, configurationChan, 1)
 }

pkg/provider/kubernetes/crd/kubernetes_test.go

@@ -6551,7 +6551,7 @@ func TestCreateBasicAuthCredentials(t *testing.T) {
 	username = components[0]
 	hashedPassword = components[1]
 
-	assert.Equal(t, username, "test2")
-	assert.Equal(t, hashedPassword, "$apr1$d9hr9HBB$4HxwgUir3HP4EsggP/QNo0")
+	assert.Equal(t, "test2", username)
+	assert.Equal(t, "$apr1$d9hr9HBB$4HxwgUir3HP4EsggP/QNo0", hashedPassword)
 	assert.True(t, auth.CheckSecret("test2", hashedPassword))
 }

pkg/provider/kubernetes/gateway/kubernetes_test.go

@@ -5204,7 +5204,7 @@ func Test_getAllowedRoutes(t *testing.T) {
 				return
 			}
 
-			require.Len(t, conditions, 0)
+			require.Empty(t, conditions)
 			assert.Equal(t, test.wantKinds, got)
 		})
 	}

pkg/provider/kubernetes/ingress/convert.go

@@ -13,7 +13,7 @@ type marshaler interface {
 }
 
 type unmarshaler interface {
-	Unmarshal([]byte) error
+	Unmarshal(data []byte) error
 }
 
 type LoadBalancerIngress interface {

pkg/provider/kubernetes/ingress/kubernetes.go

@@ -319,7 +319,7 @@ func (p *Provider) loadConfigurationFromIngresses(ctx context.Context, client Cl
 				portString := pa.Backend.Service.Port.Name
 
 				if len(pa.Backend.Service.Port.Name) == 0 {
-					portString = fmt.Sprint(pa.Backend.Service.Port.Number)
+					portString = strconv.Itoa(int(pa.Backend.Service.Port.Number))
 				}
 
 				serviceName := provider.Normalize(ingress.Namespace + "-" + pa.Backend.Service.Name + "-" + portString)

pkg/server/configurationwatcher_test.go

@@ -265,7 +265,7 @@ func TestListenProvidersThrottleProviderConfigReload(t *testing.T) {
 
 	providerAggregator := aggregator.ProviderAggregator{}
 	err := providerAggregator.AddProvider(pvd)
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	watcher := NewConfigurationWatcher(routinesPool, providerAggregator, []string{}, "")
 
@@ -340,7 +340,7 @@ func TestListenProvidersSkipsSameConfigurationForProvider(t *testing.T) {
 
 	// give some time so that the configuration can be processed
 	time.Sleep(100 * time.Millisecond)
-	assert.Equal(t, configurationReloads, 1, "Same configuration should not be published multiple times")
+	assert.Equal(t, 1, configurationReloads, "Same configuration should not be published multiple times")
 }
 
 func TestListenProvidersDoesNotSkipFlappingConfiguration(t *testing.T) {
@@ -447,7 +447,7 @@ func TestListenProvidersIgnoreSameConfig(t *testing.T) {
 
 	providerAggregator := aggregator.ProviderAggregator{}
 	err := providerAggregator.AddProvider(pvd)
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	watcher := NewConfigurationWatcher(routinesPool, providerAggregator, []string{"defaultEP"}, "")
 
@@ -589,7 +589,7 @@ func TestListenProvidersIgnoreIntermediateConfigs(t *testing.T) {
 
 	providerAggregator := aggregator.ProviderAggregator{}
 	err := providerAggregator.AddProvider(pvd)
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	watcher := NewConfigurationWatcher(routinesPool, providerAggregator, []string{"defaultEP"}, "")
 

pkg/server/router/tcp/router_test.go

@@ -618,12 +618,12 @@ func Test_Routing(t *testing.T) {
 				err := check.checkRouter(epListener.Addr().String(), timeout)
 
 				if check.expectedError != "" {
-					require.NotNil(t, err, check.desc)
+					require.Error(t, err, check.desc)
 					assert.Contains(t, err.Error(), check.expectedError, check.desc)
 					continue
 				}
 
-				assert.Nil(t, err, check.desc)
+				assert.NoError(t, err, check.desc)
 			}
 
 			epListener.Close()

pkg/server/server_entrypoint_tcp.go

@@ -499,7 +499,7 @@ func (c *connectionTracker) Close() {
 }
 
 type stoppable interface {
-	Shutdown(context.Context) error
+	Shutdown(ctx context.Context) error
 	Close() error
 }
 

pkg/server/service/loadbalancer/mirror/mirror_test.go

@@ -98,7 +98,7 @@ func TestHijack(t *testing.T) {
 	var mirrorRequest bool
 	err := mirror.AddMirror(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
 		hijacker, ok := rw.(http.Hijacker)
-		assert.Equal(t, true, ok)
+		assert.True(t, ok)
 
 		_, _, err := hijacker.Hijack()
 		assert.Error(t, err)
@@ -109,7 +109,7 @@ func TestHijack(t *testing.T) {
 	mirror.ServeHTTP(httptest.NewRecorder(), httptest.NewRequest(http.MethodGet, "/", nil))
 
 	pool.Stop()
-	assert.Equal(t, true, mirrorRequest)
+	assert.True(t, mirrorRequest)
 }
 
 func TestFlush(t *testing.T) {
@@ -122,7 +122,7 @@ func TestFlush(t *testing.T) {
 	var mirrorRequest bool
 	err := mirror.AddMirror(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
 		hijacker, ok := rw.(http.Flusher)
-		assert.Equal(t, true, ok)
+		assert.True(t, ok)
 
 		hijacker.Flush()
 
@@ -133,7 +133,7 @@ func TestFlush(t *testing.T) {
 	mirror.ServeHTTP(httptest.NewRecorder(), httptest.NewRequest(http.MethodGet, "/", nil))
 
 	pool.Stop()
-	assert.Equal(t, true, mirrorRequest)
+	assert.True(t, mirrorRequest)
 }
 
 func TestMirroringWithBody(t *testing.T) {
@@ -233,7 +233,7 @@ func TestCloneRequest(t *testing.T) {
 
 		_, expectedBytes, err := newReusableRequest(req, 2)
 		assert.Error(t, err)
-		assert.Equal(t, bb[:3], expectedBytes)
+		assert.Equal(t, expectedBytes, bb[:3])
 	})
 
 	t.Run("valid case with maxBodySize", func(t *testing.T) {
@@ -258,7 +258,7 @@ func TestCloneRequest(t *testing.T) {
 		rr, expectedBytes, err := newReusableRequest(req, 20)
 		assert.NoError(t, err)
 		assert.Nil(t, expectedBytes)
-		assert.Len(t, rr.body, 0)
+		assert.Empty(t, rr.body)
 	})
 
 	t.Run("no request given", func(t *testing.T) {

pkg/server/service/proxy_websocket_test.go

@@ -56,7 +56,7 @@ func TestWebSocketTCPClose(t *testing.T) {
 	serverErr := <-errChan
 
 	var wsErr *gorillawebsocket.CloseError
-	require.True(t, errors.As(serverErr, &wsErr))
+	require.ErrorAs(t, serverErr, &wsErr)
 	assert.Equal(t, 1006, wsErr.Code)
 }
 

pkg/server/service/service_test.go

@@ -417,7 +417,7 @@ func Test1xxResponses(t *testing.T) {
 		},
 	}
 	handler, err := sm.getLoadBalancerServiceHandler(context.Background(), "foobar", config)
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	frontend := httptest.NewServer(handler)
 	t.Cleanup(frontend.Close)
@@ -463,7 +463,7 @@ func Test1xxResponses(t *testing.T) {
 	req, _ := http.NewRequestWithContext(httptrace.WithClientTrace(context.Background(), trace), http.MethodGet, frontend.URL, nil)
 
 	res, err := frontendClient.Do(req)
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	defer res.Body.Close()
 

pkg/tls/tlsmanager_test.go

@@ -173,7 +173,7 @@ func TestManager_Get(t *testing.T) {
 			}
 
 			require.NoError(t, err)
-			assert.Equal(t, config.MinVersion, test.expectedMinVersion)
+			assert.Equal(t, test.expectedMinVersion, config.MinVersion)
 		})
 	}
 }
@@ -317,10 +317,10 @@ func TestClientAuth(t *testing.T) {
 			if test.expectedRawSubject != nil {
 				subjects := config.ClientCAs.Subjects()
 				assert.Len(t, subjects, 1)
-				assert.Equal(t, subjects[0], test.expectedRawSubject)
+				assert.Equal(t, test.expectedRawSubject, subjects[0])
 			}
 
-			assert.Equal(t, config.ClientAuth, test.expectedClientAuth)
+			assert.Equal(t, test.expectedClientAuth, config.ClientAuth)
 		})
 	}
 }
@@ -330,9 +330,9 @@ func TestManager_Get_DefaultValues(t *testing.T) {
 
 	// Ensures we won't break things for Traefik users when updating Go
 	config, _ := tlsManager.Get("default", "default")
-	assert.Equal(t, config.MinVersion, uint16(tls.VersionTLS12))
-	assert.Equal(t, config.NextProtos, []string{"h2", "http/1.1", "acme-tls/1"})
-	assert.Equal(t, config.CipherSuites, []uint16{
+	assert.Equal(t, uint16(tls.VersionTLS12), config.MinVersion)
+	assert.Equal(t, []string{"h2", "http/1.1", "acme-tls/1"}, config.NextProtos)
+	assert.Equal(t, []uint16{
 		tls.TLS_RSA_WITH_AES_128_CBC_SHA,
 		tls.TLS_RSA_WITH_AES_256_CBC_SHA,
 		tls.TLS_RSA_WITH_AES_128_GCM_SHA256,
@@ -350,5 +350,5 @@ func TestManager_Get_DefaultValues(t *testing.T) {
 		tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
 		tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,
 		tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256,
-	})
+	}, config.CipherSuites)
 }

pkg/tracing/operation_name.go

@@ -2,7 +2,7 @@ package tracing
 
 import (
 	"crypto/sha256"
-	"fmt"
+	"encoding/hex"
 	"strings"
 
 	"github.com/traefik/traefik/v2/pkg/log"
@@ -61,5 +61,5 @@ func computeHash(name string) string {
 		log.WithoutContext().WithField("OperationName", name).Errorf("Failed to create Span name hash for %s: %v", name, err)
 	}
 
-	return fmt.Sprintf("%x", hash.Sum(nil))[:TraceNameHashLength]
+	return hex.EncodeToString(hash.Sum(nil))[:TraceNameHashLength]
 }

pkg/tracing/operation_name_test.go

@@ -129,7 +129,7 @@ func TestTruncateString(t *testing.T) {
 			actual := truncateString(test.text, test.limit)
 
 			assert.Equal(t, test.expected, actual)
-			assert.True(t, len(actual) <= test.limit)
+			assert.LessOrEqual(t, len(actual), test.limit)
 		})
 	}
 }

pkg/udp/conn_test.go

@@ -220,10 +220,10 @@ func testTimeout(t *testing.T, withRead bool) {
 
 	time.Sleep(10 * time.Millisecond)
 
-	assert.Equal(t, 10, len(ln.conns))
+	assert.Len(t, ln.conns, 10)
 
 	time.Sleep(ln.timeout + time.Second)
-	assert.Equal(t, 0, len(ln.conns))
+	assert.Empty(t, ln.conns)
 }
 
 func TestShutdown(t *testing.T) {