Add support for multiple line text and perfdata to nagios parser (#5601)

plugins/inputs/exec/exec.go

@@ -3,12 +3,12 @@ package exec
 import (
 	"bytes"
 	"fmt"
+	"log"
 	"os/exec"
 	"path/filepath"
 	"runtime"
 	"strings"
 	"sync"
-	"syscall"
 	"time"
 
 	"github.com/kballard/go-shellquote"
@@ -61,39 +61,18 @@ func NewExec() *Exec {
 }
 
 type Runner interface {
-	Run(*Exec, string, telegraf.Accumulator) ([]byte, error)
+	Run(string, time.Duration) ([]byte, []byte, error)
 }
 
 type CommandRunner struct{}
 
-func AddNagiosState(exitCode error, acc telegraf.Accumulator) error {
-	nagiosState := 0
-	if exitCode != nil {
-		exiterr, ok := exitCode.(*exec.ExitError)
-		if ok {
-			status, ok := exiterr.Sys().(syscall.WaitStatus)
-			if ok {
-				nagiosState = status.ExitStatus()
-			} else {
-				return fmt.Errorf("exec: unable to get nagios plugin exit code")
-			}
-		} else {
-			return fmt.Errorf("exec: unable to get nagios plugin exit code")
-		}
-	}
-	fields := map[string]interface{}{"state": nagiosState}
-	acc.AddFields("nagios_state", fields, nil)
-	return nil
-}
-
 func (c CommandRunner) Run(
-	e *Exec,
 	command string,
-	acc telegraf.Accumulator,
+	timeout time.Duration,
-) ([]byte, error) {
+) ([]byte, []byte, error) {
 	split_cmd, err := shellquote.Split(command)
 	if err != nil || len(split_cmd) == 0 {
-		return nil, fmt.Errorf("exec: unable to parse command, %s", err)
+		return nil, nil, fmt.Errorf("exec: unable to parse command, %s", err)
 	}
 
 	cmd := exec.Command(split_cmd[0], split_cmd[1:]...)
@@ -105,44 +84,35 @@ func (c CommandRunner) Run(
 	cmd.Stdout = &out
 	cmd.Stderr = &stderr
 
-	if err := internal.RunTimeout(cmd, e.Timeout.Duration); err != nil {
+	runErr := internal.RunTimeout(cmd, timeout)
-		switch e.parser.(type) {
-		case *nagios.NagiosParser:
-			AddNagiosState(err, acc)
-		default:
-			var errMessage = ""
-			if stderr.Len() > 0 {
-				stderr = removeCarriageReturns(stderr)
-				// Limit the number of bytes.
-				didTruncate := false
-				if stderr.Len() > MaxStderrBytes {
-					stderr.Truncate(MaxStderrBytes)
-					didTruncate = true
-				}
-				if i := bytes.IndexByte(stderr.Bytes(), '\n'); i > 0 {
-					// Only show truncation if the newline wasn't the last character.
-					if i < stderr.Len()-1 {
-						didTruncate = true
-					}
-					stderr.Truncate(i)
-				}
-				if didTruncate {
-					stderr.WriteString("...")
-				}
-
-				errMessage = fmt.Sprintf(": %s", stderr.String())
-			}
-			return nil, fmt.Errorf("exec: %s for command '%s'%s", err, command, errMessage)
-		}
-	} else {
-		switch e.parser.(type) {
-		case *nagios.NagiosParser:
-			AddNagiosState(nil, acc)
-		}
-	}
 
 	out = removeCarriageReturns(out)
-	return out.Bytes(), nil
+	if stderr.Len() > 0 {
+		stderr = removeCarriageReturns(stderr)
+		stderr = truncate(stderr)
+	}
+
+	return out.Bytes(), stderr.Bytes(), runErr
+}
+
+func truncate(buf bytes.Buffer) bytes.Buffer {
+	// Limit the number of bytes.
+	didTruncate := false
+	if buf.Len() > MaxStderrBytes {
+		buf.Truncate(MaxStderrBytes)
+		didTruncate = true
+	}
+	if i := bytes.IndexByte(buf.Bytes(), '\n'); i > 0 {
+		// Only show truncation if the newline wasn't the last character.
+		if i < buf.Len()-1 {
+			didTruncate = true
+		}
+		buf.Truncate(i)
+	}
+	if didTruncate {
+		buf.WriteString("...")
+	}
+	return buf
 }
 
 // removeCarriageReturns removes all carriage returns from the input if the
@@ -173,9 +143,11 @@ func removeCarriageReturns(b bytes.Buffer) bytes.Buffer {
 
 func (e *Exec) ProcessCommand(command string, acc telegraf.Accumulator, wg *sync.WaitGroup) {
 	defer wg.Done()
+	_, isNagios := e.parser.(*nagios.NagiosParser)
 
-	out, err := e.runner.Run(e, command, acc)
+	out, errbuf, runErr := e.runner.Run(command, e.Timeout.Duration)
-	if err != nil {
+	if !isNagios && runErr != nil {
+		err := fmt.Errorf("exec: %s for command '%s': %s", runErr, command, string(errbuf))
 		acc.AddError(err)
 		return
 	}
@@ -183,10 +155,18 @@ func (e *Exec) ProcessCommand(command string, acc telegraf.Accumulator, wg *sync
 	metrics, err := e.parser.Parse(out)
 	if err != nil {
 		acc.AddError(err)
-	} else {
+		return
-		for _, metric := range metrics {
-			acc.AddFields(metric.Name(), metric.Fields(), metric.Tags(), metric.Time())
 	}
+
+	if isNagios {
+		metrics, err = nagios.TryAddState(runErr, metrics)
+		if err != nil {
+			log.Printf("E! [inputs.exec] failed to add nagios state: %s", err)
+		}
+	}
+
+	for _, m := range metrics {
+		acc.AddMetric(m)
 	}
 }
 

plugins/inputs/exec/exec_test.go

@@ -5,8 +5,8 @@ import (
 	"fmt"
 	"runtime"
 	"testing"
+	"time"
 
-	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/parsers"
 
 	"github.com/influxdata/telegraf/testutil"
@@ -75,21 +75,20 @@ var crTests = []CarriageReturnTest{
 
 type runnerMock struct {
 	out    []byte
+	errout []byte
 	err    error
 }
 
-func newRunnerMock(out []byte, err error) Runner {
+func newRunnerMock(out []byte, errout []byte, err error) Runner {
 	return &runnerMock{
 		out:    out,
+		errout: errout,
 		err:    err,
 	}
 }
 
-func (r runnerMock) Run(e *Exec, command string, acc telegraf.Accumulator) ([]byte, error) {
+func (r runnerMock) Run(command string, _ time.Duration) ([]byte, []byte, error) {
-	if r.err != nil {
+	return r.out, r.errout, r.err
-		return nil, r.err
-	}
-	return r.out, nil
 }
 
 func TestExec(t *testing.T) {
@@ -98,7 +97,7 @@ func TestExec(t *testing.T) {
 		MetricName: "exec",
 	})
 	e := &Exec{
-		runner:   newRunnerMock([]byte(validJson), nil),
+		runner:   newRunnerMock([]byte(validJson), nil, nil),
 		Commands: []string{"testcommand arg1"},
 		parser:   parser,
 	}
@@ -127,7 +126,7 @@ func TestExecMalformed(t *testing.T) {
 		MetricName: "exec",
 	})
 	e := &Exec{
-		runner:   newRunnerMock([]byte(malformedJson), nil),
+		runner:   newRunnerMock([]byte(malformedJson), nil, nil),
 		Commands: []string{"badcommand arg1"},
 		parser:   parser,
 	}
@@ -143,7 +142,7 @@ func TestCommandError(t *testing.T) {
 		MetricName: "exec",
 	})
 	e := &Exec{
-		runner:   newRunnerMock(nil, fmt.Errorf("exit status code 1")),
+		runner:   newRunnerMock(nil, nil, fmt.Errorf("exit status code 1")),
 		Commands: []string{"badcommand"},
 		parser:   parser,
 	}
@@ -201,6 +200,66 @@ func TestExecCommandWithoutGlobAndPath(t *testing.T) {
 	acc.AssertContainsFields(t, "metric", fields)
 }
 
+func TestTruncate(t *testing.T) {
+	tests := []struct {
+		name string
+		bufF func() *bytes.Buffer
+		expF func() *bytes.Buffer
+	}{
+		{
+			name: "should not truncate",
+			bufF: func() *bytes.Buffer {
+				var b bytes.Buffer
+				b.WriteString("hello world")
+				return &b
+			},
+			expF: func() *bytes.Buffer {
+				var b bytes.Buffer
+				b.WriteString("hello world")
+				return &b
+			},
+		},
+		{
+			name: "should truncate up to the new line",
+			bufF: func() *bytes.Buffer {
+				var b bytes.Buffer
+				b.WriteString("hello world\nand all the people")
+				return &b
+			},
+			expF: func() *bytes.Buffer {
+				var b bytes.Buffer
+				b.WriteString("hello world...")
+				return &b
+			},
+		},
+		{
+			name: "should truncate to the MaxStderrBytes",
+			bufF: func() *bytes.Buffer {
+				var b bytes.Buffer
+				for i := 0; i < 2*MaxStderrBytes; i++ {
+					b.WriteByte('b')
+				}
+				return &b
+			},
+			expF: func() *bytes.Buffer {
+				var b bytes.Buffer
+				for i := 0; i < MaxStderrBytes; i++ {
+					b.WriteByte('b')
+				}
+				b.WriteString("...")
+				return &b
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			res := truncate(*tt.bufF())
+			require.Equal(t, tt.expF().Bytes(), res.Bytes())
+		})
+	}
+}
+
 func TestRemoveCarriageReturns(t *testing.T) {
 	if runtime.GOOS == "windows" {
 		// Test that all carriage returns are removed

plugins/parsers/nagios/parser.go

@@ -1,17 +1,78 @@
 package nagios
 
 import (
+	"bufio"
+	"bytes"
 	"errors"
+	"fmt"
 	"log"
+	"os/exec"
 	"regexp"
 	"strconv"
 	"strings"
+	"syscall"
 	"time"
 
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/metric"
 )
 
+// getExitCode get the exit code from an error value which is the result
+// of running a command through exec package api.
+func getExitCode(err error) (int, error) {
+	if err == nil {
+		return 0, nil
+	}
+
+	ee, ok := err.(*exec.ExitError)
+	if !ok {
+		// If it is not an *exec.ExitError, then it must be
+		// an io error, but docs do not say anything about the
+		// exit code in this case.
+		return 0, errors.New("expected *exec.ExitError")
+	}
+
+	ws, ok := ee.Sys().(syscall.WaitStatus)
+	if !ok {
+		return 0, errors.New("expected syscall.WaitStatus")
+	}
+
+	return ws.ExitStatus(), nil
+}
+
+// TryAddState attempts to add a state derived from the runErr.
+// If any error occurs, it is guaranteed to be returned along with
+// the initial metric slice.
+func TryAddState(runErr error, metrics []telegraf.Metric) ([]telegraf.Metric, error) {
+	state, err := getExitCode(runErr)
+	if err != nil {
+		return metrics, fmt.Errorf("exec: get exit code: %s", err)
+	}
+
+	for _, m := range metrics {
+		if m.Name() == "nagios_state" {
+			m.AddField("state", state)
+			return metrics, nil
+		}
+	}
+
+	var ts time.Time
+	if len(metrics) != 0 {
+		ts = metrics[0].Time()
+	} else {
+		ts = time.Now().UTC()
+	}
+	f := map[string]interface{}{
+		"state": state,
+	}
+	m, err := metric.New("nagios_state", nil, f, ts)
+	if err != nil {
+		return metrics, err
+	}
+	metrics = append(metrics, m)
+	return metrics, nil
+}
+
 type NagiosParser struct {
 	MetricName  string
 	DefaultTags map[string]string
@@ -34,27 +95,88 @@ func (p *NagiosParser) SetDefaultTags(tags map[string]string) {
 }
 
 func (p *NagiosParser) Parse(buf []byte) ([]telegraf.Metric, error) {
+	ts := time.Now().UTC()
+
+	s := bufio.NewScanner(bytes.NewReader(buf))
+
+	var msg bytes.Buffer
+	var longmsg bytes.Buffer
+
 	metrics := make([]telegraf.Metric, 0)
-	lines := strings.Split(strings.TrimSpace(string(buf)), "\n")
 
-	for _, line := range lines {
+	// Scan the first line.
-		data_splitted := strings.Split(line, "|")
+	if !s.Scan() && s.Err() != nil {
-
+		return nil, s.Err()
-		if len(data_splitted) != 2 {
-			// got human readable output only or bad line
-			continue
 	}
-		m, err := parsePerfData(data_splitted[1])
+	parts := bytes.Split(s.Bytes(), []byte{'|'})
+	switch len(parts) {
+	case 2:
+		ms, err := parsePerfData(string(parts[1]), ts)
 		if err != nil {
 			log.Printf("E! [parser.nagios] failed to parse performance data: %s\n", err.Error())
-			continue
 		}
-		metrics = append(metrics, m...)
+		metrics = append(metrics, ms...)
+		fallthrough
+	case 1:
+		msg.Write(bytes.TrimSpace(parts[0]))
+	default:
+		return nil, errors.New("illegal output format")
 	}
+
+	// Read long output.
+	for s.Scan() {
+		if bytes.Contains(s.Bytes(), []byte{'|'}) {
+			parts := bytes.Split(s.Bytes(), []byte{'|'})
+			if longmsg.Len() != 0 {
+				longmsg.WriteByte('\n')
+			}
+			longmsg.Write(bytes.TrimSpace(parts[0]))
+
+			ms, err := parsePerfData(string(parts[1]), ts)
+			if err != nil {
+				log.Printf("E! [parser.nagios] failed to parse performance data: %s\n", err.Error())
+			}
+			metrics = append(metrics, ms...)
+			break
+		}
+		if longmsg.Len() != 0 {
+			longmsg.WriteByte('\n')
+		}
+		longmsg.Write(bytes.TrimSpace((s.Bytes())))
+	}
+
+	// Parse extra performance data.
+	for s.Scan() {
+		ms, err := parsePerfData(s.Text(), ts)
+		if err != nil {
+			log.Printf("E! [parser.nagios] failed to parse performance data: %s\n", err.Error())
+		}
+		metrics = append(metrics, ms...)
+	}
+
+	if s.Err() != nil {
+		log.Printf("D! [parser.nagios] unexpected io error: %s\n", s.Err())
+	}
+
+	// Create nagios state.
+	fields := map[string]interface{}{
+		"service_output": msg.String(),
+	}
+	if longmsg.Len() != 0 {
+		fields["long_service_output"] = longmsg.String()
+	}
+
+	m, err := metric.New("nagios_state", nil, fields, ts)
+	if err == nil {
+		metrics = append(metrics, m)
+	} else {
+		log.Printf("E! [parser.nagios] failed to add nagios_state: %s\n", err)
+	}
+
 	return metrics, nil
 }
 
-func parsePerfData(perfdatas string) ([]telegraf.Metric, error) {
+func parsePerfData(perfdatas string, timestamp time.Time) ([]telegraf.Metric, error) {
 	metrics := make([]telegraf.Metric, 0)
 
 	for _, unParsedPerf := range perfSplitRegExp.FindAllString(perfdatas, -1) {
@@ -125,7 +247,7 @@ func parsePerfData(perfdatas string) ([]telegraf.Metric, error) {
 		}
 
 		// Create metric
-		metric, err := metric.New("nagios", tags, fields, time.Now().UTC())
+		metric, err := metric.New("nagios", tags, fields, timestamp)
 		if err != nil {
 			return nil, err
 		}

plugins/parsers/nagios/parser_test.go

@@ -1,33 +1,244 @@
 package nagios
 
 import (
+	"errors"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/metric"
+	"github.com/influxdata/telegraf/testutil"
 )
 
-const validOutput1 = `PING OK - Packet loss = 0%, RTA = 0.30 ms|rta=0.298000ms;4000.000000;6000.000000;0.000000 pl=0%;80;90;0;100
+func TestGetExitCode(t *testing.T) {
-This is a long output
+	tests := []struct {
-with three lines
+		name    string
-`
+		errF    func() error
-const validOutput2 = "TCP OK - 0.008 second response time on port 80|time=0.008457s;;;0.000000;10.000000"
+		expCode int
-const validOutput3 = "TCP OK - 0.008 second response time on port 80|time=0.008457"
+		expErr  error
-const validOutput4 = "OK: Load average: 0.00, 0.01, 0.05 | 'load1'=0.00;~:4;@0:6;0; 'load5'=0.01;3;0:5;0; 'load15'=0.05;0:2;0:4;0;"
+	}{
-const invalidOutput3 = "PING OK - Packet loss = 0%, RTA = 0.30 ms"
+		{
-const invalidOutput4 = "PING OK - Packet loss = 0%, RTA = 0.30 ms| =3;;;; dgasdg =;;;; sff=;;;;"
+			name: "nil error passed is ok",
+			errF: func() error {
+				return nil
+			},
+			expCode: 0,
+			expErr:  nil,
+		},
+		{
+			name: "unexpected error type",
+			errF: func() error {
+				return errors.New("I am not *exec.ExitError")
+			},
+			expCode: 0,
+			expErr:  errors.New("expected *exec.ExitError"),
+		},
+	}
 
-func TestParseValidOutput(t *testing.T) {
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			e := tt.errF()
+			code, err := getExitCode(e)
+
+			require.Equal(t, tt.expCode, code)
+			require.Equal(t, tt.expErr, err)
+		})
+	}
+}
+
+type metricBuilder struct {
+	name      string
+	tags      map[string]string
+	fields    map[string]interface{}
+	timestamp time.Time
+}
+
+func mb() *metricBuilder {
+	return &metricBuilder{}
+}
+
+func (b *metricBuilder) n(v string) *metricBuilder {
+	b.name = v
+	return b
+}
+
+func (b *metricBuilder) t(k, v string) *metricBuilder {
+	if b.tags == nil {
+		b.tags = make(map[string]string)
+	}
+	b.tags[k] = v
+	return b
+}
+
+func (b *metricBuilder) f(k string, v interface{}) *metricBuilder {
+	if b.fields == nil {
+		b.fields = make(map[string]interface{})
+	}
+	b.fields[k] = v
+	return b
+}
+
+func (b *metricBuilder) ts(v time.Time) *metricBuilder {
+	b.timestamp = v
+	return b
+}
+
+func (b *metricBuilder) b() telegraf.Metric {
+	m, err := metric.New(b.name, b.tags, b.fields, b.timestamp)
+	if err != nil {
+		panic(err)
+	}
+	return m
+}
+
+// assertEqual asserts two slices to be equal. Note, that the order
+// of the entries matters.
+func assertEqual(t *testing.T, exp, actual []telegraf.Metric) {
+	require.Equal(t, len(exp), len(actual))
+	for i := 0; i < len(exp); i++ {
+		ok := testutil.MetricEqual(exp[i], actual[i])
+		require.True(t, ok)
+	}
+}
+
+func TestTryAddState(t *testing.T) {
+	tests := []struct {
+		name    string
+		runErrF func() error
+		metrics []telegraf.Metric
+		assertF func(*testing.T, []telegraf.Metric, error)
+	}{
+		{
+			name: "should append state=0 field to existing metric",
+			runErrF: func() error {
+				return nil
+			},
+			metrics: []telegraf.Metric{
+				mb().
+					n("nagios").
+					f("perfdata", 0).b(),
+				mb().
+					n("nagios_state").
+					f("service_output", "OK: system working").b(),
+			},
+			assertF: func(t *testing.T, metrics []telegraf.Metric, err error) {
+				exp := []telegraf.Metric{
+					mb().
+						n("nagios").
+						f("perfdata", 0).b(),
+					mb().
+						n("nagios_state").
+						f("service_output", "OK: system working").
+						f("state", 0).b(),
+				}
+				assertEqual(t, exp, metrics)
+				require.NoError(t, err)
+			},
+		},
+		{
+			name: "should create 'nagios_state state=0' and same timestamp as others",
+			runErrF: func() error {
+				return nil
+			},
+			metrics: []telegraf.Metric{
+				mb().
+					n("nagios").
+					f("perfdata", 0).b(),
+			},
+			assertF: func(t *testing.T, metrics []telegraf.Metric, err error) {
+				exp := []telegraf.Metric{
+					mb().
+						n("nagios").
+						f("perfdata", 0).b(),
+					mb().
+						n("nagios_state").
+						f("state", 0).b(),
+				}
+				assertEqual(t, exp, metrics)
+				require.NoError(t, err)
+			},
+		},
+		{
+			name: "should create 'nagios_state state=0' and recent timestamp",
+			runErrF: func() error {
+				return nil
+			},
+			metrics: []telegraf.Metric{},
+			assertF: func(t *testing.T, metrics []telegraf.Metric, err error) {
+				require.Len(t, metrics, 1)
+				m := metrics[0]
+				require.Equal(t, "nagios_state", m.Name())
+				s, ok := m.GetField("state")
+				require.True(t, ok)
+				require.Equal(t, int64(0), s)
+				require.WithinDuration(t, time.Now().UTC(), m.Time(), 10*time.Second)
+				require.NoError(t, err)
+			},
+		},
+		{
+			name: "should return original metrics and an error",
+			runErrF: func() error {
+				return errors.New("non parsable error")
+			},
+			metrics: []telegraf.Metric{
+				mb().
+					n("nagios").
+					f("perfdata", 0).b(),
+			},
+			assertF: func(t *testing.T, metrics []telegraf.Metric, err error) {
+				exp := []telegraf.Metric{
+					mb().
+						n("nagios").
+						f("perfdata", 0).b(),
+				}
+				expErr := "exec: get exit code: expected *exec.ExitError"
+
+				assertEqual(t, exp, metrics)
+				require.Equal(t, expErr, err.Error())
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			metrics, err := TryAddState(tt.runErrF(), tt.metrics)
+			tt.assertF(t, metrics, err)
+		})
+	}
+}
+
+func assertNagiosState(t *testing.T, m telegraf.Metric, f map[string]interface{}) {
+	assert.Equal(t, map[string]string{}, m.Tags())
+	assert.Equal(t, f, m.Fields())
+}
+
+func TestParse(t *testing.T) {
 	parser := NagiosParser{
 		MetricName: "nagios_test",
 	}
 
-	// Output1
+	tests := []struct {
-	metrics, err := parser.Parse([]byte(validOutput1))
+		name    string
+		input   string
+		assertF func(*testing.T, []telegraf.Metric, error)
+	}{
+		{
+			name: "valid output 1",
+			input: `PING OK - Packet loss = 0%, RTA = 0.30 ms|rta=0.298000ms;4000.000000;6000.000000;0.000000 pl=0%;80;90;0;100
+This is a long output
+with three lines
+`,
+			assertF: func(t *testing.T, metrics []telegraf.Metric, err error) {
 				require.NoError(t, err)
-	require.Len(t, metrics, 2)
+				require.Len(t, metrics, 3)
 				// rta
-	assert.Equal(t, "rta", metrics[0].Tags()["perfdata"])
+				assert.Equal(t, map[string]string{
+					"unit":     "ms",
+					"perfdata": "rta",
+				}, metrics[0].Tags())
 				assert.Equal(t, map[string]interface{}{
 					"value":       float64(0.298),
 					"warning_lt":  float64(0),
@@ -36,9 +247,12 @@ func TestParseValidOutput(t *testing.T) {
 					"critical_gt": float64(6000),
 					"min":         float64(0),
 				}, metrics[0].Fields())
-	assert.Equal(t, map[string]string{"unit": "ms", "perfdata": "rta"}, metrics[0].Tags())
+
 				// pl
-	assert.Equal(t, "pl", metrics[1].Tags()["perfdata"])
+				assert.Equal(t, map[string]string{
+					"unit":     "%",
+					"perfdata": "pl",
+				}, metrics[1].Tags())
 				assert.Equal(t, map[string]interface{}{
 					"value":       float64(0),
 					"warning_lt":  float64(0),
@@ -48,38 +262,64 @@ func TestParseValidOutput(t *testing.T) {
 					"min":         float64(0),
 					"max":         float64(100),
 				}, metrics[1].Fields())
-	assert.Equal(t, map[string]string{"unit": "%", "perfdata": "pl"}, metrics[1].Tags())
 
-	// Output2
+				assertNagiosState(t, metrics[2], map[string]interface{}{
-	metrics, err = parser.Parse([]byte(validOutput2))
+					"service_output":      "PING OK - Packet loss = 0%, RTA = 0.30 ms",
+					"long_service_output": "This is a long output\nwith three lines",
+				})
+			},
+		},
+		{
+			name:  "valid output 2",
+			input: "TCP OK - 0.008 second response time on port 80|time=0.008457s;;;0.000000;10.000000",
+			assertF: func(t *testing.T, metrics []telegraf.Metric, err error) {
 				require.NoError(t, err)
-	require.Len(t, metrics, 1)
+				require.Len(t, metrics, 2)
 				// time
-	assert.Equal(t, "time", metrics[0].Tags()["perfdata"])
+				assert.Equal(t, map[string]string{
+					"unit":     "s",
+					"perfdata": "time",
+				}, metrics[0].Tags())
 				assert.Equal(t, map[string]interface{}{
 					"value": float64(0.008457),
 					"min":   float64(0),
 					"max":   float64(10),
 				}, metrics[0].Fields())
-	assert.Equal(t, map[string]string{"unit": "s", "perfdata": "time"}, metrics[0].Tags())
 
-	// Output3
+				assertNagiosState(t, metrics[1], map[string]interface{}{
-	metrics, err = parser.Parse([]byte(validOutput3))
+					"service_output": "TCP OK - 0.008 second response time on port 80",
+				})
+			},
+		},
+		{
+			name:  "valid output 3",
+			input: "TCP OK - 0.008 second response time on port 80|time=0.008457",
+			assertF: func(t *testing.T, metrics []telegraf.Metric, err error) {
 				require.NoError(t, err)
-	require.Len(t, metrics, 1)
+				require.Len(t, metrics, 2)
 				// time
-	assert.Equal(t, "time", metrics[0].Tags()["perfdata"])
+				assert.Equal(t, map[string]string{
+					"perfdata": "time",
+				}, metrics[0].Tags())
 				assert.Equal(t, map[string]interface{}{
 					"value": float64(0.008457),
 				}, metrics[0].Fields())
-	assert.Equal(t, map[string]string{"perfdata": "time"}, metrics[0].Tags())
 
-	// Output4
+				assertNagiosState(t, metrics[1], map[string]interface{}{
-	metrics, err = parser.Parse([]byte(validOutput4))
+					"service_output": "TCP OK - 0.008 second response time on port 80",
+				})
+			},
+		},
+		{
+			name:  "valid output 4",
+			input: "OK: Load average: 0.00, 0.01, 0.05 | 'load1'=0.00;~:4;@0:6;0; 'load5'=0.01;3;0:5;0; 'load15'=0.05;0:2;0:4;0;",
+			assertF: func(t *testing.T, metrics []telegraf.Metric, err error) {
 				require.NoError(t, err)
-	require.Len(t, metrics, 3)
+				require.Len(t, metrics, 4)
-	// load
+				// load1
-	// const validOutput4 = "OK: Load average: 0.00, 0.01, 0.05 | 'load1'=0.00;0:4;0:6;0; 'load5'=0.01;0:3;0:5;0; 'load15'=0.05;0:2;0:4;0;"
+				assert.Equal(t, map[string]string{
+					"perfdata": "load1",
+				}, metrics[0].Tags())
 				assert.Equal(t, map[string]interface{}{
 					"value":       float64(0.00),
 					"warning_lt":  MinFloat64,
@@ -89,24 +329,148 @@ func TestParseValidOutput(t *testing.T) {
 					"min":         float64(0),
 				}, metrics[0].Fields())
 
-	assert.Equal(t, map[string]string{"perfdata": "load1"}, metrics[0].Tags())
+				// load5
+				assert.Equal(t, map[string]string{
+					"perfdata": "load5",
+				}, metrics[1].Tags())
+				assert.Equal(t, map[string]interface{}{
+					"value":       float64(0.01),
+					"warning_gt":  float64(3),
+					"warning_lt":  float64(0),
+					"critical_lt": float64(0),
+					"critical_gt": float64(5),
+					"min":         float64(0),
+				}, metrics[1].Fields())
+
+				// load15
+				assert.Equal(t, map[string]string{
+					"perfdata": "load15",
+				}, metrics[2].Tags())
+				assert.Equal(t, map[string]interface{}{
+					"value":       float64(0.05),
+					"warning_lt":  float64(0),
+					"warning_gt":  float64(2),
+					"critical_lt": float64(0),
+					"critical_gt": float64(4),
+					"min":         float64(0),
+				}, metrics[2].Fields())
+
+				assertNagiosState(t, metrics[3], map[string]interface{}{
+					"service_output": "OK: Load average: 0.00, 0.01, 0.05",
+				})
+			},
+		},
+		{
+			name:  "no perf data",
+			input: "PING OK - Packet loss = 0%, RTA = 0.30 ms",
+			assertF: func(t *testing.T, metrics []telegraf.Metric, err error) {
+				require.NoError(t, err)
+				require.Len(t, metrics, 1)
+
+				assertNagiosState(t, metrics[0], map[string]interface{}{
+					"service_output": "PING OK - Packet loss = 0%, RTA = 0.30 ms",
+				})
+			},
+		},
+		{
+			name:  "malformed perf data",
+			input: "PING OK - Packet loss = 0%, RTA = 0.30 ms| =3;;;; dgasdg =;;;; sff=;;;;",
+			assertF: func(t *testing.T, metrics []telegraf.Metric, err error) {
+				require.NoError(t, err)
+				require.Len(t, metrics, 1)
+
+				assertNagiosState(t, metrics[0], map[string]interface{}{
+					"service_output": "PING OK - Packet loss = 0%, RTA = 0.30 ms",
+				})
+			},
+		},
+		{
+			name: "from https://assets.nagios.com/downloads/nagioscore/docs/nagioscore/3/en/pluginapi.html",
+			input: `DISK OK - free space: / 3326 MB (56%); | /=2643MB;5948;5958;0;5968
+/ 15272 MB (77%);
+/boot 68 MB (69%);
+/home 69357 MB (27%);
+/var/log 819 MB (84%); | /boot=68MB;88;93;0;98
+/home=69357MB;253404;253409;0;253414
+/var/log=818MB;970;975;0;980
+`,
+			assertF: func(t *testing.T, metrics []telegraf.Metric, err error) {
+				require.NoError(t, err)
+				require.Len(t, metrics, 5)
+				// /=2643MB;5948;5958;0;5968
+				assert.Equal(t, map[string]string{
+					"unit":     "MB",
+					"perfdata": "/",
+				}, metrics[0].Tags())
+				assert.Equal(t, map[string]interface{}{
+					"value":       float64(2643),
+					"warning_lt":  float64(0),
+					"warning_gt":  float64(5948),
+					"critical_lt": float64(0),
+					"critical_gt": float64(5958),
+					"min":         float64(0),
+					"max":         float64(5968),
+				}, metrics[0].Fields())
+
+				// /boot=68MB;88;93;0;98
+				assert.Equal(t, map[string]string{
+					"unit":     "MB",
+					"perfdata": "/boot",
+				}, metrics[1].Tags())
+				assert.Equal(t, map[string]interface{}{
+					"value":       float64(68),
+					"warning_lt":  float64(0),
+					"warning_gt":  float64(88),
+					"critical_lt": float64(0),
+					"critical_gt": float64(93),
+					"min":         float64(0),
+					"max":         float64(98),
+				}, metrics[1].Fields())
+
+				// /home=69357MB;253404;253409;0;253414
+				assert.Equal(t, map[string]string{
+					"unit":     "MB",
+					"perfdata": "/home",
+				}, metrics[2].Tags())
+				assert.Equal(t, map[string]interface{}{
+					"value":       float64(69357),
+					"warning_lt":  float64(0),
+					"warning_gt":  float64(253404),
+					"critical_lt": float64(0),
+					"critical_gt": float64(253409),
+					"min":         float64(0),
+					"max":         float64(253414),
+				}, metrics[2].Fields())
+
+				// /var/log=818MB;970;975;0;980
+				assert.Equal(t, map[string]string{
+					"unit":     "MB",
+					"perfdata": "/var/log",
+				}, metrics[3].Tags())
+				assert.Equal(t, map[string]interface{}{
+					"value":       float64(818),
+					"warning_lt":  float64(0),
+					"warning_gt":  float64(970),
+					"critical_lt": float64(0),
+					"critical_gt": float64(975),
+					"min":         float64(0),
+					"max":         float64(980),
+				}, metrics[3].Fields())
+
+				assertNagiosState(t, metrics[4], map[string]interface{}{
+					"service_output":      "DISK OK - free space: / 3326 MB (56%);",
+					"long_service_output": "/ 15272 MB (77%);\n/boot 68 MB (69%);\n/home 69357 MB (27%);\n/var/log 819 MB (84%);",
+				})
+			},
+		},
 	}
 
-func TestParseInvalidOutput(t *testing.T) {
+	for _, tt := range tests {
-	parser := NagiosParser{
+		t.Run(tt.name, func(t *testing.T) {
-		MetricName: "nagios_test",
+			metrics, err := parser.Parse([]byte(tt.input))
+			tt.assertF(t, metrics, err)
+		})
 	}
-
-	// invalidOutput3
-	metrics, err := parser.Parse([]byte(invalidOutput3))
-	require.NoError(t, err)
-	require.Len(t, metrics, 0)
-
-	// invalidOutput4
-	metrics, err = parser.Parse([]byte(invalidOutput4))
-	require.NoError(t, err)
-	require.Len(t, metrics, 0)
-
 }
 
 func TestParseThreshold(t *testing.T) {