chore: enable perfsprint linter

.golangci.yaml

@@ -18,6 +18,7 @@ linters:
     - govet
     - ineffassign
     - misspell
+    - perfsprint
     - staticcheck
     - testifylint
     - thelper
@@ -39,6 +40,17 @@ linters-settings:
       - typeSwitchVar
   goimports:
     local-prefixes: github.com/argoproj/argo-cd/v2
+  perfsprint:
+    # Optimizes even if it requires an int or uint type cast.
+    int-conversion: true
+    # Optimizes into `err.Error()` even if it is only equivalent for non-nil errors.
+    err-error: false
+    # Optimizes `fmt.Errorf`.
+    errorf: false
+    # Optimizes `fmt.Sprintf` with only one argument.
+    sprintf1: true
+    # Optimizes into strings concatenation.
+    strconcat: false
   testifylint:
     enable-all: true
     disable:

applicationset/controllers/applicationset_controller.go

@@ -19,6 +19,7 @@ import (
 	"fmt"
 	"reflect"
 	"sort"
+	"strconv"
 	"strings"
 	"time"
 
@@ -1047,7 +1048,7 @@ func (r *ApplicationSetReconciler) updateApplicationSetApplicationStatus(ctx con
 				LastTransitionTime: &now,
 				Message:            "No Application status found, defaulting status to Waiting.",
 				Status:             "Waiting",
-				Step:               fmt.Sprint(getAppStep(app.Name, appStepMap)),
+				Step:               strconv.Itoa(getAppStep(app.Name, appStepMap)),
 				TargetRevisions:    app.Status.GetRevisions(),
 			}
 		} else {
@@ -1072,7 +1073,7 @@ func (r *ApplicationSetReconciler) updateApplicationSetApplicationStatus(ctx con
 			currentAppStatus.LastTransitionTime = &now
 			currentAppStatus.Status = "Waiting"
 			currentAppStatus.Message = "Application has pending changes, setting status to Waiting."
-			currentAppStatus.Step = fmt.Sprint(getAppStep(currentAppStatus.Application, appStepMap))
+			currentAppStatus.Step = strconv.Itoa(getAppStep(currentAppStatus.Application, appStepMap))
 			currentAppStatus.TargetRevisions = app.Status.GetRevisions()
 		}
 
@@ -1090,14 +1091,14 @@ func (r *ApplicationSetReconciler) updateApplicationSetApplicationStatus(ctx con
 					currentAppStatus.LastTransitionTime = &now
 					currentAppStatus.Status = "Progressing"
 					currentAppStatus.Message = "Application resource completed a sync successfully, updating status from Pending to Progressing."
-					currentAppStatus.Step = fmt.Sprint(getAppStep(currentAppStatus.Application, appStepMap))
+					currentAppStatus.Step = strconv.Itoa(getAppStep(currentAppStatus.Application, appStepMap))
 				}
 			} else if operationPhaseString == "Running" || healthStatusString == "Progressing" {
 				logCtx.Infof("Application %v has entered Progressing status, updating its ApplicationSet status to Progressing", app.Name)
 				currentAppStatus.LastTransitionTime = &now
 				currentAppStatus.Status = "Progressing"
 				currentAppStatus.Message = "Application resource became Progressing, updating status from Pending to Progressing."
-				currentAppStatus.Step = fmt.Sprint(getAppStep(currentAppStatus.Application, appStepMap))
+				currentAppStatus.Step = strconv.Itoa(getAppStep(currentAppStatus.Application, appStepMap))
 			}
 		}
 
@@ -1106,15 +1107,15 @@ func (r *ApplicationSetReconciler) updateApplicationSetApplicationStatus(ctx con
 			currentAppStatus.LastTransitionTime = &now
 			currentAppStatus.Status = healthStatusString
 			currentAppStatus.Message = "Application resource is already Healthy, updating status from Waiting to Healthy."
-			currentAppStatus.Step = fmt.Sprint(getAppStep(currentAppStatus.Application, appStepMap))
+			currentAppStatus.Step = strconv.Itoa(getAppStep(currentAppStatus.Application, appStepMap))
 		}
 
 		if currentAppStatus.Status == "Progressing" && isApplicationHealthy(app) {
 			logCtx.Infof("Application %v has completed Progressing status, updating its ApplicationSet status to Healthy", app.Name)
 			currentAppStatus.LastTransitionTime = &now
 			currentAppStatus.Status = healthStatusString
 			currentAppStatus.Message = "Application resource became Healthy, updating status from Progressing to Healthy."
-			currentAppStatus.Step = fmt.Sprint(getAppStep(currentAppStatus.Application, appStepMap))
+			currentAppStatus.Step = strconv.Itoa(getAppStep(currentAppStatus.Application, appStepMap))
 		}
 
 		appStatuses = append(appStatuses, currentAppStatus)
@@ -1185,7 +1186,7 @@ func (r *ApplicationSetReconciler) updateApplicationSetApplicationStatusProgress
 				appStatus.LastTransitionTime = &now
 				appStatus.Status = "Pending"
 				appStatus.Message = "Application moved to Pending status, watching for the Application resource to start Progressing."
-				appStatus.Step = fmt.Sprint(getAppStep(appStatus.Application, appStepMap))
+				appStatus.Step = strconv.Itoa(getAppStep(appStatus.Application, appStepMap))
 
 				updateCountMap[appStepMap[appStatus.Application]] += 1
 			}

applicationset/utils/map.go

@@ -8,10 +8,7 @@ func ConvertToMapStringString(mapStringInterface map[string]interface{}) map[str
 	mapStringString := make(map[string]string, len(mapStringInterface))
 
 	for key, value := range mapStringInterface {
-		strKey := fmt.Sprintf("%v", key)
-		strValue := fmt.Sprintf("%v", value)
-
-		mapStringString[strKey] = strValue
+		mapStringString[key] = fmt.Sprintf("%v", value)
 	}
 	return mapStringString
 }

common/common_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"os"
+	"strconv"
 	"testing"
 	"time"
 
@@ -41,7 +42,7 @@ func Test_GRPCKeepAliveMinIsSet(t *testing.T) {
 // Test invalid env var set for EnvGRPCKeepAliveMin
 func Test_GRPCKeepAliveMinIncorrectlySet(t *testing.T) {
 	numSeconds := 15
-	os.Setenv(EnvGRPCKeepAliveMin, fmt.Sprintf("%d", numSeconds))
+	os.Setenv(EnvGRPCKeepAliveMin, strconv.Itoa(numSeconds))
 
 	grpcKeepAliveMin := GetGRPCKeepAliveEnforcementMinimum()
 	grpcKeepAliveExpectedMin := defaultGRPCKeepAliveEnforcementMinimum

controller/cache/info.go

@@ -451,7 +451,7 @@ func populatePodInfo(un *unstructured.Unstructured, res *ResourceInfo) {
 	res.Info = append(res.Info, v1alpha1.InfoItem{Name: "Node", Value: pod.Spec.NodeName})
 	res.Info = append(res.Info, v1alpha1.InfoItem{Name: "Containers", Value: fmt.Sprintf("%d/%d", readyContainers, totalContainers)})
 	if restarts > 0 {
-		res.Info = append(res.Info, v1alpha1.InfoItem{Name: "Restart Count", Value: fmt.Sprintf("%d", restarts)})
+		res.Info = append(res.Info, v1alpha1.InfoItem{Name: "Restart Count", Value: strconv.Itoa(restarts)})
 	}
 
 	var urls []string

controller/sharding/sharding_test.go

@@ -226,7 +226,7 @@ func TestGetShardByIndexModuloReplicasCountDistributionFunctionWhenClusterNumber
 	// The other implementation was giving almost linear time of 400ms up to 10'000 clusters
 	clusterPointers := []*v1alpha1.Cluster{}
 	for i := 0; i < 2048; i++ {
-		cluster := createCluster(fmt.Sprintf("cluster-%d", i), fmt.Sprintf("%d", i))
+		cluster := createCluster(fmt.Sprintf("cluster-%d", i), strconv.Itoa(i))
 		clusterPointers = append(clusterPointers, &cluster)
 	}
 	replicasCount := 2

controller/sharding/shuffle_test.go

@@ -20,7 +20,7 @@ func TestLargeShuffle(t *testing.T) {
 	clusterList := &v1alpha1.ClusterList{Items: []v1alpha1.Cluster{}}
 	for i := 0; i < math.MaxInt/4096; i += 256 {
 		// fmt.Fprintf(os.Stdout, "%d", i)
-		cluster := createCluster(fmt.Sprintf("cluster-%d", i), fmt.Sprintf("%d", i))
+		cluster := createCluster(fmt.Sprintf("cluster-%d", i), strconv.Itoa(i))
 		clusterList.Items = append(clusterList.Items, cluster)
 	}
 	db.On("ListClusters", mock.Anything).Return(clusterList, nil)

reposerver/repository/chart.go

@@ -20,7 +20,7 @@ func getChartDetails(chartYAML string) (*v1alpha1.ChartDetails, error) {
 		if maintainer.Email != "" {
 			maintainers = append(maintainers, strings.Trim(fmt.Sprintf("%v <%v>", maintainer.Name, maintainer.Email), " "))
 		} else {
-			maintainers = append(maintainers, fmt.Sprintf("%v", maintainer.Name))
+			maintainers = append(maintainers, maintainer.Name)
 		}
 	}
 	return &v1alpha1.ChartDetails{

server/application/application_test.go

@@ -242,7 +242,7 @@ func newTestAppServerWithEnforcerConfigure(t *testing.T, f func(*rbac.Enforcer),
 						oldVersion = 0
 					}
 					clonedApp := app.DeepCopy()
-					clonedApp.ResourceVersion = fmt.Sprintf("%d", oldVersion+1)
+					clonedApp.ResourceVersion = strconv.Itoa(oldVersion + 1)
 					events <- &appsv1.ApplicationWatchEvent{Type: watch.Added, Application: *clonedApp}
 				}
 			}
@@ -425,7 +425,7 @@ func newTestAppServerWithEnforcerConfigureWithBenchmark(b *testing.B, f func(*rb
 						oldVersion = 0
 					}
 					clonedApp := app.DeepCopy()
-					clonedApp.ResourceVersion = fmt.Sprintf("%d", oldVersion+1)
+					clonedApp.ResourceVersion = strconv.Itoa(oldVersion + 1)
 					events <- &appsv1.ApplicationWatchEvent{Type: watch.Added, Application: *clonedApp}
 				}
 			}

server/logout/logout_test.go

@@ -3,10 +3,10 @@ package logout
 import (
 	"context"
 	"errors"
-	"fmt"
 	"net/http"
 	"net/http/httptest"
 	"regexp"
+	"strconv"
 	"testing"
 
 	"github.com/argoproj/argo-cd/v2/common"
@@ -385,7 +385,7 @@ func TestHandlerConstructLogoutURL(t *testing.T) {
 			if status := tt.responseRecorder.Code; status != http.StatusSeeOther {
 				if !tt.wantErr {
 					t.Error(tt.responseRecorder.Body.String())
-					t.Error("handler returned wrong status code: " + fmt.Sprintf("%d", tt.responseRecorder.Code))
+					t.Error("handler returned wrong status code: " + strconv.Itoa(tt.responseRecorder.Code))
 				}
 			} else {
 				if tt.wantErr {

test/e2e/fixture/app/actions.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
+	"strconv"
 
 	log "github.com/sirupsen/logrus"
 	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -345,7 +346,7 @@ func (a *Actions) Sync(args ...string) *Actions {
 	if a.context.name != "" {
 		args = append(args, a.context.AppQualifiedName())
 	}
-	args = append(args, "--timeout", fmt.Sprintf("%v", a.context.timeout))
+	args = append(args, "--timeout", strconv.Itoa(a.context.timeout))
 
 	if a.context.async {
 		args = append(args, "--async")
@@ -441,7 +442,7 @@ func (a *Actions) Wait(args ...string) *Actions {
 	if a.context.name != "" {
 		args = append(args, a.context.AppQualifiedName())
 	}
-	args = append(args, "--timeout", fmt.Sprintf("%v", a.context.timeout))
+	args = append(args, "--timeout", strconv.Itoa(a.context.timeout))
 	a.runCli(args...)
 	return a
 }

test/e2e/project_management_test.go

@@ -566,11 +566,11 @@ func TestGetVirtualProjectNoMatch(t *testing.T) {
 	time.Sleep(time.Second * 2)
 
 	// App trying to sync a resource which is not blacked listed anywhere
-	_, err = fixture.RunCli("app", "sync", fixture.Name(), "--resource", "apps:Deployment:guestbook-ui", "--timeout", fmt.Sprintf("%v", 10))
+	_, err = fixture.RunCli("app", "sync", fixture.Name(), "--resource", "apps:Deployment:guestbook-ui", "--timeout", strconv.Itoa(10))
 	require.NoError(t, err)
 
 	// app trying to sync a resource which is black listed by global project
-	_, err = fixture.RunCli("app", "sync", fixture.Name(), "--resource", ":Service:guestbook-ui", "--timeout", fmt.Sprintf("%v", 10))
+	_, err = fixture.RunCli("app", "sync", fixture.Name(), "--resource", ":Service:guestbook-ui", "--timeout", strconv.Itoa(10))
 	require.NoError(t, err)
 }
 
@@ -606,11 +606,11 @@ func TestGetVirtualProjectMatch(t *testing.T) {
 	time.Sleep(time.Second * 2)
 
 	// App trying to sync a resource which is not blacked listed anywhere
-	_, err = fixture.RunCli("app", "sync", fixture.Name(), "--resource", "apps:Deployment:guestbook-ui", "--timeout", fmt.Sprintf("%v", 10))
+	_, err = fixture.RunCli("app", "sync", fixture.Name(), "--resource", "apps:Deployment:guestbook-ui", "--timeout", strconv.Itoa(10))
 	require.ErrorContains(t, err, "blocked by sync window")
 
 	// app trying to sync a resource which is black listed by global project
-	_, err = fixture.RunCli("app", "sync", fixture.Name(), "--resource", ":Service:guestbook-ui", "--timeout", fmt.Sprintf("%v", 10))
+	_, err = fixture.RunCli("app", "sync", fixture.Name(), "--resource", ":Service:guestbook-ui", "--timeout", strconv.Itoa(10))
 	assert.ErrorContains(t, err, "blocked by sync window")
 }
 

util/env/env_test.go

@@ -3,6 +3,7 @@ package env
 import (
 	"fmt"
 	"math"
+	"strconv"
 	"testing"
 	"time"
 
@@ -23,10 +24,10 @@ func TestParseNumFromEnv(t *testing.T) {
 		{"Valid positive number", "200", 200},
 		{"Valid negative number", "-200", -200},
 		{"Invalid number", "abc", def},
-		{"Equals minimum", fmt.Sprintf("%d", math.MinInt+1), min},
-		{"Equals maximum", fmt.Sprintf("%d", math.MaxInt-1), max},
-		{"Less than minimum", fmt.Sprintf("%d", math.MinInt), def},
-		{"Greater than maximum", fmt.Sprintf("%d", math.MaxInt), def},
+		{"Equals minimum", strconv.Itoa(math.MinInt + 1), min},
+		{"Equals maximum", strconv.Itoa(math.MaxInt - 1), max},
+		{"Less than minimum", strconv.Itoa(math.MinInt), def},
+		{"Greater than maximum", strconv.Itoa(math.MaxInt), def},
 		{"Variable not set", "", def},
 	}
 
@@ -81,10 +82,10 @@ func TestParseInt64FromEnv(t *testing.T) {
 	}{
 		{"Valid int64", "200", 200},
 		{"Text as invalid int64", "abc", def},
-		{"Equals maximum", fmt.Sprintf("%d", max), max},
-		{"Equals minimum", fmt.Sprintf("%d", min), min},
-		{"Greater than maximum", fmt.Sprintf("%d", max+1), def},
-		{"Less than minimum", fmt.Sprintf("%d", min-1), def},
+		{"Equals maximum", strconv.FormatInt(max, 10), max},
+		{"Equals minimum", strconv.FormatInt(min, 10), min},
+		{"Greater than maximum", strconv.FormatInt(max+1, 10), def},
+		{"Less than minimum", strconv.FormatInt(min-1, 10), def},
 		{"Environment not set", "", def},
 	}
 

util/exec/exec.go

@@ -52,7 +52,7 @@ func RunWithRedactor(cmd *exec.Cmd, redactor func(text string) string) (string,
 func RunWithExecRunOpts(cmd *exec.Cmd, opts ExecRunOpts) (string, error) {
 	cmdOpts := argoexec.CmdOpts{Timeout: timeout, Redactor: opts.Redactor, TimeoutBehavior: opts.TimeoutBehavior, SkipErrorLogging: opts.SkipErrorLogging}
 	span := tracing.NewLoggingTracer(log.NewLogrusLogger(log.NewWithCurrentConfig())).StartSpan(fmt.Sprintf("exec %v", cmd.Args[0]))
-	span.SetBaggageItem("dir", fmt.Sprintf("%v", cmd.Dir))
+	span.SetBaggageItem("dir", cmd.Dir)
 	if cmdOpts.Redactor != nil {
 		span.SetBaggageItem("args", opts.Redactor(fmt.Sprintf("%v", cmd.Args)))
 	} else {

util/git/creds.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"crypto/sha256"
 	"encoding/base64"
+	"encoding/hex"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -427,7 +428,7 @@ func (g GitHubAppCreds) getAccessToken() (string, error) {
 	if err != nil {
 		return "", err
 	}
-	key := fmt.Sprintf("%x", h.Sum(nil))
+	key := hex.EncodeToString(h.Sum(nil))
 
 	// Check cache for GitHub transport which helps fetch an API token
 	t, found := githubAppTokenCache.Get(key)
@@ -543,7 +544,7 @@ func (c GoogleCloudCreds) getAccessToken() (string, error) {
 	if err != nil {
 		return "", err
 	}
-	key := fmt.Sprintf("%x", h.Sum(nil))
+	key := hex.EncodeToString(h.Sum(nil))
 
 	t, found := googleCloudTokenSource.Get(key)
 	if found {

util/jwt/jwt_test.go

@@ -1,7 +1,6 @@
 package jwt
 
 import (
-	"fmt"
 	"testing"
 	"time"
 
@@ -45,7 +44,7 @@ func TestIssuedAtTime_Int64(t *testing.T) {
 	claims := jwt.MapClaims{"iat": int64(1606831200)}
 	issuedAt, err := IssuedAtTime(claims)
 	require.NoError(t, err)
-	str := fmt.Sprint(issuedAt.UTC().Format("Mon Jan _2 15:04:05 2006"))
+	str := issuedAt.UTC().Format("Mon Jan _2 15:04:05 2006")
 	assert.Equal(t, "Tue Dec  1 14:00:00 2020", str)
 }
 

util/lua/oslib_safe.go

@@ -6,7 +6,7 @@ package lua
 // github.com/yuin/gopher-lua.
 
 import (
-	"fmt"
+	"strconv"
 	"strings"
 	"time"
 
@@ -116,7 +116,7 @@ func strftime(t time.Time, cfmt string) string {
 				} else {
 					switch c {
 					case 'w':
-						sc.AppendString(fmt.Sprint(int(t.Weekday())))
+						sc.AppendString(strconv.Itoa(int(t.Weekday())))
 					default:
 						sc.AppendChar('%')
 						sc.AppendChar(c)

util/session/sessionmanager_test.go

@@ -478,8 +478,8 @@ func TestCacheValueGetters(t *testing.T) {
 	})
 
 	t.Run("Greater than allowed in environment overrides", func(t *testing.T) {
-		t.Setenv(envLoginMaxFailCount, fmt.Sprintf("%d", math.MaxInt32+1))
-		t.Setenv(envLoginMaxCacheSize, fmt.Sprintf("%d", math.MaxInt32+1))
+		t.Setenv(envLoginMaxFailCount, strconv.Itoa(math.MaxInt32+1))
+		t.Setenv(envLoginMaxCacheSize, strconv.Itoa(math.MaxInt32+1))
 
 		mlf := getMaxLoginFailures()
 		assert.Equal(t, defaultMaxLoginFailures, mlf)