chore: Fix linter findings for Windows (part1)

.golangci.yml

@@ -244,7 +244,7 @@ issues:
     # revive:var-naming
     - don't use an underscore in package name
     # EXC0001 errcheck: Almost all programs ignore errors on these functions and in most cases it's ok
-    - Error return value of .((os\.)?std(out|err)\..*|.*Close|.*Flush|os\.Remove(All)?|.*print(f|ln)?|os\.(Un)?Setenv). is not checked
+    - Error return value of .((os\.)?std(out|err)\..*|.*Close.*|.*Flush|.*Disconnect|.*Clear|os\.Remove(All)?|.*print(f|ln)?|os\.(Un)?Setenv). is not checked
     # EXC0013 revive: Annoying issue about not having a comment. The rare codebase has such comments
     - package comment should be of the form "(.+)...
     # EXC0015 revive: Annoying issue about not having a comment. The rare codebase has such comments

plugins/inputs/execd/execd_windows.go

@@ -3,6 +3,7 @@
 package execd
 
 import (
+	"errors"
 	"fmt"
 	"io"
 	"os"
@@ -19,10 +20,14 @@ func (e *Execd) Gather(acc telegraf.Accumulator) error {
 	switch e.Signal {
 	case "STDIN":
 		if osStdin, ok := e.process.Stdin.(*os.File); ok {
-			osStdin.SetWriteDeadline(time.Now().Add(1 * time.Second))
+			if err := osStdin.SetWriteDeadline(time.Now().Add(1 * time.Second)); err != nil {
+				if !errors.Is(err, os.ErrNoDeadline) {
+					return fmt.Errorf("setting write deadline failed: %w", err)
+				}
+			}
 		}
 		if _, err := io.WriteString(e.process.Stdin, "\n"); err != nil {
-			return fmt.Errorf("Error writing to stdin: %s", err)
+			return fmt.Errorf("error writing to stdin: %w", err)
 		}
 	case "none":
 	default:

plugins/inputs/execd/shim/goshim_windows.go

@@ -13,10 +13,8 @@ func listenForCollectMetricsSignals(ctx context.Context, collectMetricsPrompt ch
 	signal.Notify(collectMetricsPrompt, syscall.SIGHUP)
 
 	go func() {
-		select {
-		case <-ctx.Done():
-			// context done. stop to signals to avoid pushing messages to a closed channel
-			signal.Stop(collectMetricsPrompt)
-		}
+		<-ctx.Done()
+		// context done. stop to signals to avoid pushing messages to a closed channel
+		signal.Stop(collectMetricsPrompt)
 	}()
 }

plugins/inputs/ping/ping_windows.go

@@ -12,11 +12,11 @@ import (
 	"github.com/influxdata/telegraf"
 )
 
-func (p *Ping) pingToURL(u string, acc telegraf.Accumulator) {
-	tags := map[string]string{"url": u}
+func (p *Ping) pingToURL(host string, acc telegraf.Accumulator) {
+	tags := map[string]string{"url": host}
 	fields := map[string]interface{}{"result_code": 0}
 
-	args := p.args(u)
+	args := p.args(host)
 	totalTimeout := 60.0
 	if len(p.Arguments) == 0 {
 		totalTimeout = p.timeout() * float64(p.Count)
@@ -34,9 +34,9 @@ func (p *Ping) pingToURL(u string, acc telegraf.Accumulator) {
 	if err != nil {
 		// fatal error
 		if pendingError != nil {
-			acc.AddError(fmt.Errorf("%s: %s", pendingError, u))
+			acc.AddError(fmt.Errorf("%s: %w", host, pendingError))
 		} else {
-			acc.AddError(fmt.Errorf("%s: %s", err, u))
+			acc.AddError(fmt.Errorf("%s: %w", host, err))
 		}
 
 		fields["result_code"] = 2
@@ -88,7 +88,7 @@ func (p *Ping) args(url string) []string {
 func processPingOutput(out string) (int, int, int, int, int, int, error) {
 	// So find a line contain 3 numbers except reply lines
 	var stats, aproxs []string = nil, nil
-	err := errors.New("Fatal error processing ping output")
+	err := errors.New("fatal error processing ping output")
 	stat := regexp.MustCompile(`=\W*(\d+)\D*=\W*(\d+)\D*=\W*(\d+)`)
 	aprox := regexp.MustCompile(`=\W*(\d+)\D*ms\D*=\W*(\d+)\D*ms\D*=\W*(\d+)\D*ms`)
 	tttLine := regexp.MustCompile(`TTL=\d+`)

plugins/inputs/ping/ping_windows_test.go

@@ -73,7 +73,7 @@ func TestPingGather(t *testing.T) {
 		pingHost: mockHostPinger,
 	}
 
-	acc.GatherError(p.Gather)
+	require.NoError(t, acc.GatherError(p.Gather))
 	tags := map[string]string{"url": "www.google.com"}
 	fields := map[string]interface{}{
 		"packets_transmitted": 4,
@@ -118,7 +118,9 @@ func TestBadPingGather(t *testing.T) {
 		pingHost: mockErrorHostPinger,
 	}
 
-	acc.GatherError(p.Gather)
+	err := acc.GatherError(p.Gather)
+	require.NoError(t, err)
+
 	tags := map[string]string{"url": "www.amazon.com"}
 	fields := map[string]interface{}{
 		"packets_transmitted": 4,
@@ -176,7 +178,9 @@ func TestLossyPingGather(t *testing.T) {
 		pingHost: mockLossyHostPinger,
 	}
 
-	acc.GatherError(p.Gather)
+	err := acc.GatherError(p.Gather)
+	require.NoError(t, err)
+
 	tags := map[string]string{"url": "www.google.com"}
 	fields := map[string]interface{}{
 		"packets_transmitted": 9,
@@ -237,7 +241,9 @@ func TestFatalPingGather(t *testing.T) {
 		pingHost: mockFatalHostPinger,
 	}
 
-	acc.GatherError(p.Gather)
+	err := acc.GatherError(p.Gather)
+	require.Error(t, err)
+
 	require.True(t, acc.HasFloatField("ping", "errors"),
 		"Fatal ping should have packet measurements")
 	require.False(t, acc.HasInt64Field("ping", "packets_transmitted"),
@@ -283,7 +289,8 @@ func TestUnreachablePingGather(t *testing.T) {
 		pingHost: mockUnreachableHostPinger,
 	}
 
-	acc.GatherError(p.Gather)
+	err := acc.GatherError(p.Gather)
+	require.NoError(t, err)
 
 	tags := map[string]string{"url": "www.google.com"}
 	fields := map[string]interface{}{
@@ -331,7 +338,8 @@ func TestTTLExpiredPingGather(t *testing.T) {
 		pingHost: mockTTLExpiredPinger,
 	}
 
-	acc.GatherError(p.Gather)
+	err := acc.GatherError(p.Gather)
+	require.NoError(t, err)
 
 	tags := map[string]string{"url": "www.google.com"}
 	fields := map[string]interface{}{
@@ -365,5 +373,7 @@ func TestPingBinary(t *testing.T) {
 			return "", nil
 		},
 	}
-	acc.GatherError(p.Gather)
+	err := acc.GatherError(p.Gather)
+	require.Error(t, err)
+	require.EqualValues(t, "www.google.com: fatal error processing ping output", err.Error())
 }

plugins/inputs/procstat/win_service_windows.go

@@ -3,6 +3,7 @@
 package procstat
 
 import (
+	"errors"
 	"unsafe"
 
 	"golang.org/x/sys/windows"
@@ -34,7 +35,8 @@ func queryPidWithWinServiceName(winServiceName string) (uint32, error) {
 	var bytesNeeded uint32
 	var buf []byte
 
-	if err := windows.QueryServiceStatusEx(srv.Handle, windows.SC_STATUS_PROCESS_INFO, nil, 0, &bytesNeeded); err != windows.ERROR_INSUFFICIENT_BUFFER {
+	err = windows.QueryServiceStatusEx(srv.Handle, windows.SC_STATUS_PROCESS_INFO, nil, 0, &bytesNeeded)
+	if !errors.Is(err, windows.ERROR_INSUFFICIENT_BUFFER) {
 		return 0, err
 	}
 

plugins/inputs/win_eventlog/util.go

@@ -9,7 +9,6 @@ import (
 	"bytes"
 	"encoding/xml"
 	"fmt"
-	"io"
 	"strings"
 	"unicode/utf16"
 	"unicode/utf8"
@@ -97,12 +96,10 @@ func UnrollXMLFields(data []byte, fieldsUsage map[string]int, separator string)
 	for {
 		var node xmlnode
 		err := dec.Decode(&node)
-		if err == io.EOF {
-			break
-		}
 		if err != nil {
 			break
 		}
+
 		var parents []string
 		walkXML([]xmlnode{node}, parents, separator, func(node xmlnode, parents []string, separator string) bool {
 			innerText := strings.TrimSpace(node.Text)

plugins/inputs/win_eventlog/win_eventlog.go

@@ -11,6 +11,7 @@ import (
 	"bytes"
 	_ "embed"
 	"encoding/xml"
+	"errors"
 	"fmt"
 	"path/filepath"
 	"reflect"
@@ -120,7 +121,7 @@ func (w *WinEventLog) Gather(acc telegraf.Accumulator) error {
 	for {
 		events, err := w.fetchEvents(w.subscription)
 		if err != nil {
-			if err == ERROR_NO_MORE_ITEMS {
+			if errors.Is(err, ERROR_NO_MORE_ITEMS) {
 				break
 			}
 			w.Log.Errorf("Error getting events: %v", err)
@@ -333,7 +334,7 @@ func (w *WinEventLog) fetchEventHandles(subsHandle EvtHandle) ([]EvtHandle, erro
 
 	err := _EvtNext(subsHandle, eventsNumber, &eventHandles[0], 0, 0, &evtReturned)
 	if err != nil {
-		if err == ERROR_INVALID_OPERATION && evtReturned == 0 {
+		if errors.Is(err, ERROR_INVALID_OPERATION) && evtReturned == 0 {
 			return nil, ERROR_NO_MORE_ITEMS
 		}
 		return nil, err
@@ -428,7 +429,7 @@ func (w *WinEventLog) renderLocalMessage(event Event, eventHandle EvtHandle) (Ev
 	if err != nil {
 		return event, nil
 	}
-	defer _EvtClose(publisherHandle)
+	defer _EvtClose(publisherHandle) //nolint:errcheck // Ignore error returned during Close
 
 	// Populating text values
 	keywords, err := formatEventString(EvtFormatMessageKeyword, eventHandle, publisherHandle)
@@ -493,7 +494,7 @@ func formatEventString(
 	var bufferUsed uint32
 	err := _EvtFormatMessage(publisherHandle, eventHandle, 0, 0, 0, messageFlag,
 		0, nil, &bufferUsed)
-	if err != nil && err != ERROR_INSUFFICIENT_BUFFER {
+	if err != nil && !errors.Is(err, ERROR_INSUFFICIENT_BUFFER) {
 		return "", err
 	}
 

plugins/inputs/win_perf_counters/win_perf_counters.go

@@ -382,7 +382,8 @@ func (m *WinPerfCounters) ParseConfig() error {
 }
 
 func (m *WinPerfCounters) checkError(err error) error {
-	if pdhErr, ok := err.(*PdhError); ok {
+	var pdhErr *PdhError
+	if errors.As(err, &pdhErr) {
 		for _, ignoredErrors := range m.IgnoredErrors {
 			if PDHErrors[pdhErr.ErrorCode] == ignoredErrors {
 				return nil
@@ -466,7 +467,7 @@ func (m *WinPerfCounters) gatherComputerCounters(hostCounterInfo *hostCountersIn
 			if err != nil {
 				//ignore invalid data  as some counters from process instances returns this sometimes
 				if !isKnownCounterDataError(err) {
-					return fmt.Errorf("error while getting value for counter %s: %v", metric.counterPath, err)
+					return fmt.Errorf("error while getting value for counter %q: %w", metric.counterPath, err)
 				}
 				m.Log.Warnf("error while getting value for counter %q, instance: %s, will skip metric: %v", metric.counterPath, metric.instance, err)
 				continue
@@ -482,7 +483,7 @@ func (m *WinPerfCounters) gatherComputerCounters(hostCounterInfo *hostCountersIn
 			if err != nil {
 				//ignore invalid data  as some counters from process instances returns this sometimes
 				if !isKnownCounterDataError(err) {
-					return fmt.Errorf("error while getting value for counter %s: %v", metric.counterPath, err)
+					return fmt.Errorf("error while getting value for counter %q: %w", metric.counterPath, err)
 				}
 				m.Log.Warnf("error while getting value for counter %q, instance: %s, will skip metric: %v", metric.counterPath, metric.instance, err)
 				continue
@@ -555,7 +556,8 @@ func addCounterMeasurement(metric *counter, instanceName string, value interface
 }
 
 func isKnownCounterDataError(err error) bool {
-	if pdhErr, ok := err.(*PdhError); ok && (pdhErr.ErrorCode == PDH_INVALID_DATA ||
+	var pdhErr *PdhError
+	if errors.As(err, &pdhErr) && (pdhErr.ErrorCode == PDH_INVALID_DATA ||
 		pdhErr.ErrorCode == PDH_CALC_NEGATIVE_DENOMINATOR ||
 		pdhErr.ErrorCode == PDH_CALC_NEGATIVE_VALUE ||
 		pdhErr.ErrorCode == PDH_CSTATUS_INVALID_DATA ||

plugins/inputs/win_perf_counters/win_perf_counters_integration_test.go

@@ -3,13 +3,15 @@
 package win_perf_counters
 
 import (
+	"errors"
 	"fmt"
 	"strings"
 	"testing"
 	"time"
 
-	"github.com/influxdata/telegraf/testutil"
 	"github.com/stretchr/testify/require"
+
+	"github.com/influxdata/telegraf/testutil"
 )
 
 func TestWinPerformanceQueryImplIntegration(t *testing.T) {
@@ -107,7 +109,8 @@ func TestWinPerformanceQueryImplIntegration(t *testing.T) {
 	require.NoError(t, err)
 
 	farr, err := query.GetFormattedCounterArrayDouble(hCounter)
-	if phderr, ok := err.(*PdhError); ok && phderr.ErrorCode != PDH_INVALID_DATA && phderr.ErrorCode != PDH_CALC_NEGATIVE_VALUE {
+	var phdErr *PdhError
+	if errors.As(err, &phdErr) && phdErr.ErrorCode != PDH_INVALID_DATA && phdErr.ErrorCode != PDH_CALC_NEGATIVE_VALUE {
 		time.Sleep(time.Second)
 		farr, err = query.GetFormattedCounterArrayDouble(hCounter)
 	}