Add more linters

.golangci.yml

@@ -14,7 +14,6 @@ linters-settings:
       - name: error-strings
       - name: errorf
       - name: exported
-      - name: if-return
       - name: increment-decrement
       - name: indent-error-flow
       - name: package-comments
@@ -29,33 +28,52 @@ linters-settings:
       - name: var-declaration
       - name: var-naming
   govet:
-    check-shadowing: true
     enable-all: true
-
 linters:
   enable:
+    - asasalint
     - asciicheck
     - bidichk
+    - contextcheck
     - dupword
+    - durationcheck
     - errcheck
+    - errchkjson
+    - errname
     - errorlint
+    - exportloopref
+    - fatcontext
+    - forcetypeassert
+    - gocheckcompilerdirectives
+    - gochecksumtype
+    - gocritic
+    - godot
     - gofmt
     - gofumpt
     - goimports
     - gosec
     - gosimple
+    - gosmopolitan
     - govet
     - ineffassign
+    - intrange
     - makezero
     - misspell
+    - musttag
     - nilerr
     - noctx
+    - nolintlint
     - perfsprint
+    - prealloc
+    - paralleltest
     - predeclared
     - reassign
     - revive
     - staticcheck
+    - stylecheck
     - tagalign
+    - tenv
+    - thelper
     - tparallel
     - typecheck
     - unconvert
@@ -64,6 +82,8 @@ linters:
     - usestdlibvars
     - wastedassign
     - whitespace
+    - wrapcheck
+    - testpackage
   disable-all: true
 issues:
   max-issues-per-linter: 0

Makefile

@@ -2,7 +2,7 @@
 
 .PHONY: test
 test:
-	go test ./...
+	go test -v -shuffle=on -race ./...
 
 .PHONY: lint
 lint:

cmd/sync/aws.go

@@ -17,14 +17,14 @@ import (
 	yaml "gopkg.in/yaml.v2"
 )
 
-// AWSClient allows you to get the list of IP addresses of instances of an Auto Scaling group. It implements the CloudProvider interface
+// AWSClient allows you to get the list of IP addresses of instances of an Auto Scaling group. It implements the CloudProvider interface.
 type AWSClient struct {
 	svcEC2         *ec2.Client
 	svcAutoscaling *autoscaling.Client
 	config         *awsConfig
 }
 
-// NewAWSClient creates and configures an AWSClient
+// NewAWSClient creates and configures an AWSClient.
 func NewAWSClient(data []byte) (*AWSClient, error) {
 	awsClient := &AWSClient{}
 	cfg, err := parseAWSConfig(data)
@@ -37,7 +37,7 @@ func NewAWSClient(data []byte) (*AWSClient, error) {
 
 		conf, loadErr := config.LoadDefaultConfig(context.TODO())
 		if loadErr != nil {
-			return nil, loadErr
+			return nil, fmt.Errorf("unable to load default AWS config: %w", loadErr)
 		}
 
 		client := imds.NewFromConfig(conf, func(o *imds.Options) {
@@ -61,10 +61,10 @@ func NewAWSClient(data []byte) (*AWSClient, error) {
 	return awsClient, nil
 }
 
-// GetUpstreams returns the Upstreams list
+// GetUpstreams returns the Upstreams list.
 func (client *AWSClient) GetUpstreams() []Upstream {
-	var upstreams []Upstream
-	for i := 0; i < len(client.config.Upstreams); i++ {
+	upstreams := make([]Upstream, 0, len(client.config.Upstreams))
+	for i := range len(client.config.Upstreams) {
 		u := Upstream{
 			Name:         client.config.Upstreams[i].Name,
 			Port:         client.config.Upstreams[i].Port,
@@ -81,13 +81,13 @@ func (client *AWSClient) GetUpstreams() []Upstream {
 	return upstreams
 }
 
-// configure configures the AWSClient with necessary parameters
+// configure configures the AWSClient with necessary parameters.
 func (client *AWSClient) configure() error {
 	httpClient := &http.Client{Timeout: connTimeoutInSecs * time.Second}
 
 	cfg, err := config.LoadDefaultConfig(context.TODO())
 	if err != nil {
-		return err
+		return fmt.Errorf("unable to load default AWS config: %w", err)
 	}
 
 	client.svcEC2 = ec2.NewFromConfig(cfg, func(o *ec2.Options) {
@@ -103,12 +103,12 @@ func (client *AWSClient) configure() error {
 	return nil
 }
 
-// parseAWSConfig parses and validates AWSClient config
+// parseAWSConfig parses and validates AWSClient config.
 func parseAWSConfig(data []byte) (*awsConfig, error) {
 	cfg := &awsConfig{}
 	err := yaml.Unmarshal(data, cfg)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("error unmarshalling AWS config: %w", err)
 	}
 
 	err = validateAWSConfig(cfg)
@@ -119,7 +119,7 @@ func parseAWSConfig(data []byte) (*awsConfig, error) {
 	return cfg, nil
 }
 
-// CheckIfScalingGroupExists checks if the Auto Scaling group exists
+// CheckIfScalingGroupExists checks if the Auto Scaling group exists.
 func (client *AWSClient) CheckIfScalingGroupExists(name string) (bool, error) {
 	params := &ec2.DescribeInstancesInput{
 		Filters: []types.Filter{
@@ -140,7 +140,7 @@ func (client *AWSClient) CheckIfScalingGroupExists(name string) (bool, error) {
 	return len(response.Reservations) > 0, nil
 }
 
-// GetPrivateIPsForScalingGroup returns the list of IP addresses of instances of the Auto Scaling group
+// GetPrivateIPsForScalingGroup returns the list of IP addresses of instances of the Auto Scaling group.
 func (client *AWSClient) GetPrivateIPsForScalingGroup(name string) ([]string, error) {
 	var onlyInService bool
 	for _, u := range client.GetUpstreams() {
@@ -162,7 +162,7 @@ func (client *AWSClient) GetPrivateIPsForScalingGroup(name string) ([]string, er
 
 	response, err := client.svcEC2.DescribeInstances(context.Background(), params)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("couldn't describe instances: %w", err)
 	}
 
 	if len(response.Reservations) == 0 {
@@ -193,14 +193,14 @@ func (client *AWSClient) GetPrivateIPsForScalingGroup(name string) ([]string, er
 	return result, nil
 }
 
-// getInstancesInService returns the list of instances that have LifecycleState == InService
+// getInstancesInService returns the list of instances that have LifecycleState == InService.
 func (client *AWSClient) getInstancesInService(insIDtoIP map[string]string) ([]string, error) {
 	const maxItems = 50
 	var result []string
 	keys := reflect.ValueOf(insIDtoIP).MapKeys()
 	instanceIDs := make([]string, len(keys))
 
-	for i := 0; i < len(keys); i++ {
+	for i := range len(keys) {
 		instanceIDs[i] = keys[i].String()
 	}
 
@@ -211,7 +211,7 @@ func (client *AWSClient) getInstancesInService(insIDtoIP map[string]string) ([]s
 		}
 		response, err := client.svcAutoscaling.DescribeAutoScalingInstances(context.Background(), params)
 		if err != nil {
-			return nil, err
+			return nil, fmt.Errorf("couldn't describe AutoScaling instances: %w", err)
 		}
 
 		for _, ins := range response.AutoScalingInstances {

cmd/sync/aws_test.go

@@ -74,6 +74,7 @@ func getInvalidAWSConfigInput() []*testInputAWS {
 }
 
 func TestValidateAWSConfigNotValid(t *testing.T) {
+	t.Parallel()
 	input := getInvalidAWSConfigInput()
 
 	for _, item := range input {
@@ -85,6 +86,7 @@ func TestValidateAWSConfigNotValid(t *testing.T) {
 }
 
 func TestValidateAWSConfigValid(t *testing.T) {
+	t.Parallel()
 	cfg := getValidAWSConfig()
 
 	err := validateAWSConfig(cfg)
@@ -94,6 +96,7 @@ func TestValidateAWSConfigValid(t *testing.T) {
 }
 
 func TestGetUpstreamsAWS(t *testing.T) {
+	t.Parallel()
 	cfg := getValidAWSConfig()
 	upstreams := []awsUpstream{
 		{
@@ -165,6 +168,7 @@ func areEqualUpstreamsAWS(u1 awsUpstream, u2 Upstream) bool {
 }
 
 func TestPrepareBatches(t *testing.T) {
+	t.Parallel()
 	const maxItems = 3
 	ids := []string{"i-394ujfs", "i-dfdinf", "i-fsfsf", "i-8hr83hfwif", "i-nsnsnan"}
 	instanceIDs := make([]string, len(ids))

cmd/sync/azure.go

@@ -11,14 +11,14 @@ import (
 	yaml "gopkg.in/yaml.v2"
 )
 
-// AzureClient allows you to get the list of IP addresses of VirtualMachines of a VirtualMachine Scale Set. It implements the CloudProvider interface
+// AzureClient allows you to get the list of IP addresses of VirtualMachines of a VirtualMachine Scale Set. It implements the CloudProvider interface.
 type AzureClient struct {
 	config      *azureConfig
 	vMSSClient  compute.VirtualMachineScaleSetsClient
 	iFaceClient network.InterfacesClient
 }
 
-// NewAzureClient creates an AzureClient
+// NewAzureClient creates an AzureClient.
 func NewAzureClient(data []byte) (*AzureClient, error) {
 	azureClient := &AzureClient{}
 	cfg, err := parseAzureConfig(data)
@@ -36,12 +36,12 @@ func NewAzureClient(data []byte) (*AzureClient, error) {
 	return azureClient, nil
 }
 
-// parseAzureConfig parses and validates AzureClient config
+// parseAzureConfig parses and validates AzureClient config.
 func parseAzureConfig(data []byte) (*azureConfig, error) {
 	cfg := &azureConfig{}
 	err := yaml.Unmarshal(data, cfg)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("couldn't unmarshal Azure config: %w", err)
 	}
 
 	err = validateAzureConfig(cfg)
@@ -52,15 +52,15 @@ func parseAzureConfig(data []byte) (*azureConfig, error) {
 	return cfg, nil
 }
 
-// GetPrivateIPsForScalingGroup returns the list of IP addresses of instances of the Virtual Machine Scale Set
+// GetPrivateIPsForScalingGroup returns the list of IP addresses of instances of the Virtual Machine Scale Set.
 func (client *AzureClient) GetPrivateIPsForScalingGroup(name string) ([]string, error) {
 	var ips []string
 
 	ctx := context.TODO()
 
 	for iFaces, err := client.iFaceClient.ListVirtualMachineScaleSetNetworkInterfaces(ctx, client.config.ResourceGroupName, name); iFaces.NotDone() || err != nil; err = iFaces.NextWithContext(ctx) {
 		if err != nil {
-			return nil, err
+			return nil, fmt.Errorf("couldn't get the list of network interfaces: %w", err)
 		}
 
 		for _, iFace := range iFaces.Values() {
@@ -102,7 +102,7 @@ func getPrimaryIPFromInterfaceIPConfiguration(ipConfig network.InterfaceIPConfig
 	return *ipConfig.InterfaceIPConfigurationPropertiesFormat.PrivateIPAddress
 }
 
-// CheckIfScalingGroupExists checks if the Virtual Machine Scale Set exists
+// CheckIfScalingGroupExists checks if the Virtual Machine Scale Set exists.
 func (client *AzureClient) CheckIfScalingGroupExists(name string) (bool, error) {
 	ctx := context.TODO()
 	vmss, err := client.vMSSClient.Get(ctx, client.config.ResourceGroupName, name, "userData")
@@ -116,7 +116,7 @@ func (client *AzureClient) CheckIfScalingGroupExists(name string) (bool, error)
 func (client *AzureClient) configure() error {
 	authorizer, err := auth.NewAuthorizerFromEnvironment()
 	if err != nil {
-		return err
+		return fmt.Errorf("couldn't create authorizer: %w", err)
 	}
 
 	client.vMSSClient = compute.NewVirtualMachineScaleSetsClient(client.config.SubscriptionID)
@@ -127,10 +127,10 @@ func (client *AzureClient) configure() error {
 	return nil
 }
 
-// GetUpstreams returns the Upstreams list
+// GetUpstreams returns the Upstreams list.
 func (client *AzureClient) GetUpstreams() []Upstream {
-	var upstreams []Upstream
-	for i := 0; i < len(client.config.Upstreams); i++ {
+	upstreams := make([]Upstream, 0, len(client.config.Upstreams))
+	for i := range len(client.config.Upstreams) {
 		u := Upstream{
 			Name:         client.config.Upstreams[i].Name,
 			Port:         client.config.Upstreams[i].Port,

cmd/sync/azure_test.go

@@ -80,6 +80,7 @@ func getInvalidAzureConfigInput() []*testInputAzure {
 }
 
 func TestValidateAzureConfigNotValid(t *testing.T) {
+	t.Parallel()
 	input := getInvalidAzureConfigInput()
 
 	for _, item := range input {
@@ -91,6 +92,7 @@ func TestValidateAzureConfigNotValid(t *testing.T) {
 }
 
 func TestValidateAzureConfigValid(t *testing.T) {
+	t.Parallel()
 	cfg := getValidAzureConfig()
 
 	err := validateAzureConfig(cfg)
@@ -100,6 +102,7 @@ func TestValidateAzureConfigValid(t *testing.T) {
 }
 
 func TestGetPrimaryIPFromInterfaceIPConfiguration(t *testing.T) {
+	t.Parallel()
 	primary := true
 	address := "127.0.0.1"
 	ipConfig := network.InterfaceIPConfiguration{
@@ -115,6 +118,7 @@ func TestGetPrimaryIPFromInterfaceIPConfiguration(t *testing.T) {
 }
 
 func TestGetPrimaryIPFromInterfaceIPConfigurationFail(t *testing.T) {
+	t.Parallel()
 	primaryFalse := false
 	primaryTrue := true
 	tests := []struct {
@@ -158,6 +162,7 @@ func TestGetPrimaryIPFromInterfaceIPConfigurationFail(t *testing.T) {
 }
 
 func TestGetUpstreamsAzure(t *testing.T) {
+	t.Parallel()
 	cfg := getValidAzureConfig()
 	upstreams := []azureUpstream{
 		{