Fix some minor code style issues

Author: martialblog

cmd/config.go

@@ -1,7 +1,7 @@
 package cmd
 
 import (
-	"fmt"
+	"errors"
 	"net"
 	"net/http"
 	"net/url"
@@ -94,7 +94,7 @@ func (c *Config) NewClient() *client.Client {
 	if c.BasicAuth != "" {
 		s := strings.Split(c.BasicAuth, ":")
 		if len(s) != 2 {
-			check.ExitError(fmt.Errorf("specify the user name and password for server authentication <user:password>"))
+			check.ExitError(errors.New("specify the user name and password for server authentication <user:password>"))
 		}
 
 		var u = s[0]

cmd/health.go

@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"net/http"
 	"net/url"
@@ -139,7 +140,7 @@ var healthCmd = &cobra.Command{
 	 \_[OK] Heap usage at 12.00%
 	 \_[OK] Open file descriptors at 12.00%
 	 \_[WARNING] CPU usage at 55.00%`,
-	Run: func(cmd *cobra.Command, args []string) {
+	Run: func(_ *cobra.Command, _ []string) {
 		var (
 			output     string
 			rc         int
@@ -192,7 +193,7 @@ var healthCmd = &cobra.Command{
 		// Logstash Health Status
 		switch stat.Status {
 		default:
-			check.ExitError(fmt.Errorf("could not determine status"))
+			check.ExitError(errors.New("could not determine status"))
 		case "green":
 			states = append(states, check.OK)
 		case "yellow":

cmd/pipeline.go

@@ -76,7 +76,7 @@ var pipelineCmd = &cobra.Command{
 	$ check_logstash pipeline --inflight-events-warn 5 --inflight-events-crit 10 --pipeline example
 	CRITICAL - Inflight events
 	 \_[CRITICAL] inflight_events_example:15`,
-	Run: func(cmd *cobra.Command, args []string) {
+	Run: func(_ *cobra.Command, _ []string) {
 		var (
 			output     string
 			rc         int
@@ -143,7 +143,7 @@ var pipelineCmd = &cobra.Command{
 				Uom:   "c",
 				Value: pipe.Events.Out})
 			perfList.Add(&perfdata.Perfdata{
-				Label: fmt.Sprintf("inflight_events_%s", name),
+				Label: fmt.Sprintf("inflight_events_%s", name), //nolint: perfsprint
 				Warn:  thresholds.Warning,
 				Crit:  thresholds.Critical,
 				Value: inflightEvents})
@@ -187,7 +187,7 @@ var pipelineReloadCmd = &cobra.Command{
 	$ check_logstash pipeline reload --pipeline Example
 	CRITICAL - Configuration reload failed
 	 \_[CRITICAL] Configuration reload for pipeline Example failed on 2021-01-01T02:07:14Z`,
-	Run: func(cmd *cobra.Command, args []string) {
+	Run: func(_ *cobra.Command, _ []string) {
 		var (
 			output string
 			rc     int
@@ -278,7 +278,7 @@ var pipelineFlowCmd = &cobra.Command{
 	$ check_logstash pipeline flow --pipeline example --warning 5 --critical 10
 	CRITICAL - Flow metrics not alright
 	 \_[CRITICAL] queue_backpressure_example:11.23;`,
-	Run: func(cmd *cobra.Command, args []string) {
+	Run: func(_ *cobra.Command, _ []string) {
 		var (
 			output     string
 			rc         int
@@ -335,7 +335,7 @@ var pipelineFlowCmd = &cobra.Command{
 
 			// Generate perfdata for each event
 			perfList.Add(&perfdata.Perfdata{
-				Label: fmt.Sprintf("pipelines.queue_backpressure_%s", name),
+				Label: fmt.Sprintf("pipelines.queue_backpressure_%s", name), //nolint: perfsprint
 				Warn:  thresholds.Warning,
 				Crit:  thresholds.Critical,
 				Value: pipe.Flow.QueueBackpressure.Current})

cmd/root.go

@@ -12,7 +12,7 @@ var Timeout = 30
 var rootCmd = &cobra.Command{
 	Use:   "check_logstash",
 	Short: "An Icinga check plugin to check Logstash",
-	PersistentPreRun: func(cmd *cobra.Command, args []string) {
+	PersistentPreRun: func(_ *cobra.Command, _ []string) {
 		go check.HandleTimeout(Timeout)
 	},
 	Run: Usage,

internal/logstash/api.go

@@ -2,7 +2,7 @@ package logstash
 
 import (
 	"encoding/json"
-	"fmt"
+	"errors"
 	"strconv"
 	"strings"
 )
@@ -95,7 +95,7 @@ func (s *Stat) UnmarshalJSON(b []byte) error {
 		majorVersion, convErr := strconv.Atoi(v[0])
 
 		if convErr != nil {
-			return fmt.Errorf("could not determine version")
+			return errors.New("could not determine version")
 		}
 
 		s.MajorVersion = majorVersion