fix: Linter fixes for plugins/inputs/[h-j]*

plugins/inputs/haproxy/haproxy_test.go

@@ -12,8 +12,9 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/influxdata/telegraf/testutil"
 	"github.com/stretchr/testify/require"
+
+	"github.com/influxdata/telegraf/testutil"
 )
 
 type statServer struct{}
@@ -134,7 +135,7 @@ func TestHaproxyGeneratesMetricsUsingSocket(t *testing.T) {
 		}
 
 		sockets[i] = sock
-		defer sock.Close()
+		defer sock.Close() //nolint:revive // done on purpose, closing will be executed properly
 
 		s := statServer{}
 		go s.serverSocket(sock)

plugins/inputs/hddtemp/hddtemp_test.go

@@ -3,10 +3,11 @@ package hddtemp
 import (
 	"testing"
 
-	hddtemp "github.com/influxdata/telegraf/plugins/inputs/hddtemp/go-hddtemp"
-	"github.com/influxdata/telegraf/testutil"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+
+	"github.com/influxdata/telegraf/plugins/inputs/hddtemp/go-hddtemp"
+	"github.com/influxdata/telegraf/testutil"
 )
 
 type mockFetcher struct {
@@ -33,14 +34,14 @@ func newMockFetcher() *mockFetcher {
 }
 
 func TestFetch(t *testing.T) {
-	hddtemp := &HDDTemp{
+	hddTemp := &HDDTemp{
 		fetcher: newMockFetcher(),
 		Address: "localhost",
 		Devices: []string{"*"},
 	}
 
 	acc := &testutil.Accumulator{}
-	err := hddtemp.Gather(acc)
+	err := hddTemp.Gather(acc)
 
 	require.NoError(t, err)
 	assert.Equal(t, acc.NFields(), 2)

plugins/inputs/http/http_test.go

@@ -9,15 +9,16 @@ import (
 	"net/url"
 	"testing"
 
+	"github.com/stretchr/testify/require"
+
 	httpconfig "github.com/influxdata/telegraf/plugins/common/http"
-	oauth "github.com/influxdata/telegraf/plugins/common/oauth"
-	plugin "github.com/influxdata/telegraf/plugins/inputs/http"
+	"github.com/influxdata/telegraf/plugins/common/oauth"
+	httpplugin "github.com/influxdata/telegraf/plugins/inputs/http"
 	"github.com/influxdata/telegraf/plugins/parsers"
 	"github.com/influxdata/telegraf/testutil"
-	"github.com/stretchr/testify/require"
 )
 
-func TestHTTPwithJSONFormat(t *testing.T) {
+func TestHTTPWithJSONFormat(t *testing.T) {
 	fakeServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if r.URL.Path == "/endpoint" {
 			_, _ = w.Write([]byte(simpleJSON))
@@ -27,9 +28,9 @@ func TestHTTPwithJSONFormat(t *testing.T) {
 	}))
 	defer fakeServer.Close()
 
-	url := fakeServer.URL + "/endpoint"
-	plugin := &plugin.HTTP{
-		URLs: []string{url},
+	address := fakeServer.URL + "/endpoint"
+	plugin := &httpplugin.HTTP{
+		URLs: []string{address},
 	}
 	metricName := "metricName"
 
@@ -50,7 +51,7 @@ func TestHTTPwithJSONFormat(t *testing.T) {
 	require.Equal(t, metric.Measurement, metricName)
 	require.Len(t, acc.Metrics[0].Fields, 1)
 	require.Equal(t, acc.Metrics[0].Fields["a"], 1.2)
-	require.Equal(t, acc.Metrics[0].Tags["url"], url)
+	require.Equal(t, acc.Metrics[0].Tags["url"], address)
 }
 
 func TestHTTPHeaders(t *testing.T) {
@@ -69,9 +70,9 @@ func TestHTTPHeaders(t *testing.T) {
 	}))
 	defer fakeServer.Close()
 
-	url := fakeServer.URL + "/endpoint"
-	plugin := &plugin.HTTP{
-		URLs:    []string{url},
+	address := fakeServer.URL + "/endpoint"
+	plugin := &httpplugin.HTTP{
+		URLs:    []string{address},
 		Headers: map[string]string{header: headerValue},
 	}
 
@@ -92,9 +93,9 @@ func TestInvalidStatusCode(t *testing.T) {
 	}))
 	defer fakeServer.Close()
 
-	url := fakeServer.URL + "/endpoint"
-	plugin := &plugin.HTTP{
-		URLs: []string{url},
+	address := fakeServer.URL + "/endpoint"
+	plugin := &httpplugin.HTTP{
+		URLs: []string{address},
 	}
 
 	metricName := "metricName"
@@ -115,9 +116,9 @@ func TestSuccessStatusCodes(t *testing.T) {
 	}))
 	defer fakeServer.Close()
 
-	url := fakeServer.URL + "/endpoint"
-	plugin := &plugin.HTTP{
-		URLs:               []string{url},
+	address := fakeServer.URL + "/endpoint"
+	plugin := &httpplugin.HTTP{
+		URLs:               []string{address},
 		SuccessStatusCodes: []int{200, 202},
 	}
 
@@ -143,7 +144,7 @@ func TestMethod(t *testing.T) {
 	}))
 	defer fakeServer.Close()
 
-	plugin := &plugin.HTTP{
+	plugin := &httpplugin.HTTP{
 		URLs:   []string{fakeServer.URL},
 		Method: "POST",
 	}
@@ -169,18 +170,18 @@ func TestBodyAndContentEncoding(t *testing.T) {
 	ts := httptest.NewServer(http.NotFoundHandler())
 	defer ts.Close()
 
-	url := fmt.Sprintf("http://%s", ts.Listener.Addr().String())
+	address := fmt.Sprintf("http://%s", ts.Listener.Addr().String())
 
 	tests := []struct {
 		name             string
-		plugin           *plugin.HTTP
+		plugin           *httpplugin.HTTP
 		queryHandlerFunc func(t *testing.T, w http.ResponseWriter, r *http.Request)
 	}{
 		{
 			name: "no body",
-			plugin: &plugin.HTTP{
+			plugin: &httpplugin.HTTP{
 				Method: "POST",
-				URLs:   []string{url},
+				URLs:   []string{address},
 			},
 			queryHandlerFunc: func(t *testing.T, w http.ResponseWriter, r *http.Request) {
 				body, err := io.ReadAll(r.Body)
@@ -191,8 +192,8 @@ func TestBodyAndContentEncoding(t *testing.T) {
 		},
 		{
 			name: "post body",
-			plugin: &plugin.HTTP{
-				URLs:   []string{url},
+			plugin: &httpplugin.HTTP{
+				URLs:   []string{address},
 				Method: "POST",
 				Body:   "test",
 			},
@@ -205,8 +206,8 @@ func TestBodyAndContentEncoding(t *testing.T) {
 		},
 		{
 			name: "get method body is sent",
-			plugin: &plugin.HTTP{
-				URLs:   []string{url},
+			plugin: &httpplugin.HTTP{
+				URLs:   []string{address},
 				Method: "GET",
 				Body:   "test",
 			},
@@ -219,8 +220,8 @@ func TestBodyAndContentEncoding(t *testing.T) {
 		},
 		{
 			name: "gzip encoding",
-			plugin: &plugin.HTTP{
-				URLs:            []string{url},
+			plugin: &httpplugin.HTTP{
+				URLs:            []string{address},
 				Method:          "GET",
 				Body:            "test",
 				ContentEncoding: "gzip",
@@ -269,13 +270,13 @@ func TestOAuthClientCredentialsGrant(t *testing.T) {
 
 	tests := []struct {
 		name         string
-		plugin       *plugin.HTTP
+		plugin       *httpplugin.HTTP
 		tokenHandler TestHandlerFunc
 		handler      TestHandlerFunc
 	}{
 		{
 			name: "no credentials",
-			plugin: &plugin.HTTP{
+			plugin: &httpplugin.HTTP{
 				URLs: []string{u.String()},
 			},
 			handler: func(t *testing.T, w http.ResponseWriter, r *http.Request) {
@@ -285,7 +286,7 @@ func TestOAuthClientCredentialsGrant(t *testing.T) {
 		},
 		{
 			name: "success",
-			plugin: &plugin.HTTP{
+			plugin: &httpplugin.HTTP{
 				URLs: []string{u.String() + "/write"},
 				HTTPClientConfig: httpconfig.HTTPClientConfig{
 					OAuth2Config: oauth.OAuth2Config{

plugins/inputs/http_listener_v2/http_listener_v2_test.go

@@ -14,10 +14,11 @@ import (
 	"time"
 
 	"github.com/golang/snappy"
+	"github.com/stretchr/testify/require"
+
 	"github.com/influxdata/telegraf/config"
 	"github.com/influxdata/telegraf/plugins/parsers"
 	"github.com/influxdata/telegraf/testutil"
-	"github.com/stretchr/testify/require"
 )
 
 const (
@@ -371,6 +372,7 @@ func TestWriteHTTPGzippedData(t *testing.T) {
 	client := &http.Client{}
 	resp, err := client.Do(req)
 	require.NoError(t, err)
+	require.NoError(t, resp.Body.Close())
 	require.EqualValues(t, 204, resp.StatusCode)
 
 	hostTags := []string{"server02", "server03",

plugins/inputs/icinga2/icinga2.go

@@ -82,7 +82,7 @@ func (i *Icinga2) SampleConfig() string {
 
 func (i *Icinga2) GatherStatus(acc telegraf.Accumulator, checks []Object) {
 	for _, check := range checks {
-		url, err := url.Parse(i.Server)
+		serverURL, err := url.Parse(i.Server)
 		if err != nil {
 			i.Log.Error(err.Error())
 			continue
@@ -106,9 +106,9 @@ func (i *Icinga2) GatherStatus(acc telegraf.Accumulator, checks []Object) {
 			"check_command": check.Attrs.CheckCommand,
 			"source":        source,
 			"state":         levels[state],
-			"server":        url.Hostname(),
-			"scheme":        url.Scheme,
-			"port":          url.Port(),
+			"server":        serverURL.Hostname(),
+			"scheme":        serverURL.Scheme,
+			"port":          serverURL.Port(),
 		}
 
 		acc.AddFields(fmt.Sprintf("icinga2_%s", i.ObjectType), fields, tags)
@@ -152,9 +152,9 @@ func (i *Icinga2) Gather(acc telegraf.Accumulator) error {
 		requestURL += "&attrs=host_name"
 	}
 
-	url := fmt.Sprintf(requestURL, i.Server, i.ObjectType)
+	address := fmt.Sprintf(requestURL, i.Server, i.ObjectType)
 
-	req, err := http.NewRequest("GET", url, nil)
+	req, err := http.NewRequest("GET", address, nil)
 	if err != nil {
 		return err
 	}

plugins/inputs/influxdb_listener/influxdb_listener_test.go

@@ -13,10 +13,11 @@ import (
 	"testing"
 	"time"
 
+	"github.com/stretchr/testify/require"
+
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/config"
 	"github.com/influxdata/telegraf/testutil"
-	"github.com/stretchr/testify/require"
 )
 
 const (
@@ -416,6 +417,7 @@ func TestWriteGzippedData(t *testing.T) {
 	client := &http.Client{}
 	resp, err := client.Do(req)
 	require.NoError(t, err)
+	require.NoError(t, resp.Body.Close())
 	require.EqualValues(t, 204, resp.StatusCode)
 
 	hostTags := []string{"server02", "server03",
@@ -526,6 +528,7 @@ func TestQuery(t *testing.T) {
 	resp, err := http.Post(
 		createURL(listener, "http", "/query", "db=&q=CREATE+DATABASE+IF+NOT+EXISTS+%22mydb%22"), "", nil)
 	require.NoError(t, err)
+	require.NoError(t, resp.Body.Close())
 	require.EqualValues(t, 200, resp.StatusCode)
 }
 

plugins/inputs/influxdb_v2_listener/influxdb_v2_listener_test.go

@@ -15,9 +15,10 @@ import (
 	"testing"
 	"time"
 
+	"github.com/stretchr/testify/require"
+
 	"github.com/influxdata/telegraf/config"
 	"github.com/influxdata/telegraf/testutil"
-	"github.com/stretchr/testify/require"
 )
 
 const (
@@ -374,6 +375,7 @@ func TestWriteGzippedData(t *testing.T) {
 	client := &http.Client{}
 	resp, err := client.Do(req)
 	require.NoError(t, err)
+	require.NoError(t, resp.Body.Close())
 	require.EqualValues(t, 204, resp.StatusCode)
 
 	hostTags := []string{"server02", "server03",

plugins/inputs/interrupts/interrupts.go

@@ -57,7 +57,7 @@ func parseInterrupts(r io.Reader) ([]IRQ, error) {
 	if scanner.Scan() {
 		cpus := strings.Fields(scanner.Text())
 		if cpus[0] != "CPU0" {
-			return nil, fmt.Errorf("Expected first line to start with CPU0, but was %s", scanner.Text())
+			return nil, fmt.Errorf("expected first line to start with CPU0, but was %s", scanner.Text())
 		}
 		cpucount = len(cpus)
 	}
@@ -93,7 +93,7 @@ scan:
 		irqs = append(irqs, *irq)
 	}
 	if scanner.Err() != nil {
-		return nil, fmt.Errorf("Error scanning file: %s", scanner.Err())
+		return nil, fmt.Errorf("error scanning file: %s", scanner.Err())
 	}
 	return irqs, nil
 }
@@ -110,22 +110,30 @@ func gatherTagsFields(irq IRQ) (map[string]string, map[string]interface{}) {
 
 func (s *Interrupts) Gather(acc telegraf.Accumulator) error {
 	for measurement, file := range map[string]string{"interrupts": "/proc/interrupts", "soft_interrupts": "/proc/softirqs"} {
-		f, err := os.Open(file)
+		irqs, err := parseFile(file)
 		if err != nil {
-			acc.AddError(fmt.Errorf("Could not open file: %s", file))
-			continue
-		}
-		defer f.Close()
-		irqs, err := parseInterrupts(f)
-		if err != nil {
-			acc.AddError(fmt.Errorf("Parsing %s: %s", file, err))
+			acc.AddError(err)
 			continue
 		}
 		reportMetrics(measurement, irqs, acc, s.CPUAsTag)
 	}
 	return nil
 }
 
+func parseFile(file string) ([]IRQ, error) {
+	f, err := os.Open(file)
+	if err != nil {
+		return nil, fmt.Errorf("could not open file: %s", file)
+	}
+	defer f.Close()
+
+	irqs, err := parseInterrupts(f)
+	if err != nil {
+		return nil, fmt.Errorf("parsing %s: %s", file, err)
+	}
+	return irqs, nil
+}
+
 func reportMetrics(measurement string, irqs []IRQ, acc telegraf.Accumulator, cpusAsTags bool) {
 	for _, irq := range irqs {
 		tags, fields := gatherTagsFields(irq)