Allow graphite parser to create Inf and NaN values (#6420)

plugins/parsers/graphite/errors.go

@@ -1,14 +0,0 @@
-package graphite
-
-import "fmt"
-
-// An UnsupposedValueError is returned when a parsed value is not
-// supposed.
-type UnsupposedValueError struct {
-	Field string
-	Value float64
-}
-
-func (err *UnsupposedValueError) Error() string {
-	return fmt.Sprintf(`field "%s" value: "%v" is unsupported`, err.Field, err.Value)
-}

plugins/parsers/graphite/parser.go

@@ -9,9 +9,8 @@ import (
 	"strings"
 	"time"
 
-	"github.com/influxdata/telegraf/internal/templating"
-
 	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/internal/templating"
 	"github.com/influxdata/telegraf/metric"
 )
 
@@ -121,10 +120,6 @@ func (p *GraphiteParser) ParseLine(line string) (telegraf.Metric, error) {
 		return nil, fmt.Errorf(`field "%s" value: %s`, fields[0], err)
 	}
 
-	if math.IsNaN(v) || math.IsInf(v, 0) {
-		return nil, &UnsupposedValueError{Field: fields[0], Value: v}
-	}
-
 	fieldValues := map[string]interface{}{}
 	if field != "" {
 		fieldValues[field] = v

plugins/parsers/graphite/parser_test.go

@@ -1,14 +1,14 @@
 package graphite
 
 import (
-	"reflect"
+	"math"
 	"strconv"
 	"testing"
 	"time"
 
 	"github.com/influxdata/telegraf/internal/templating"
 	"github.com/influxdata/telegraf/metric"
-
+	"github.com/influxdata/telegraf/testutil"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@@ -355,14 +355,40 @@ func TestParse(t *testing.T) {
 
 func TestParseNaN(t *testing.T) {
 	p, err := NewGraphiteParser("", []string{"measurement*"}, nil)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 
-	_, err = p.ParseLine("servers.localhost.cpu_load NaN 1435077219")
-	assert.Error(t, err)
+	m, err := p.ParseLine("servers.localhost.cpu_load NaN 1435077219")
+	require.NoError(t, err)
 
-	if _, ok := err.(*UnsupposedValueError); !ok {
-		t.Fatalf("expected *ErrUnsupportedValue, got %v", reflect.TypeOf(err))
-	}
+	expected := testutil.MustMetric(
+		"servers.localhost.cpu_load",
+		map[string]string{},
+		map[string]interface{}{
+			"value": math.NaN(),
+		},
+		time.Unix(1435077219, 0),
+	)
+
+	testutil.RequireMetricEqual(t, expected, m)
+}
+
+func TestParseInf(t *testing.T) {
+	p, err := NewGraphiteParser("", []string{"measurement*"}, nil)
+	require.NoError(t, err)
+
+	m, err := p.ParseLine("servers.localhost.cpu_load +Inf 1435077219")
+	require.NoError(t, err)
+
+	expected := testutil.MustMetric(
+		"servers.localhost.cpu_load",
+		map[string]string{},
+		map[string]interface{}{
+			"value": math.Inf(1),
+		},
+		time.Unix(1435077219, 0),
+	)
+
+	testutil.RequireMetricEqual(t, expected, m)
 }
 
 func TestFilterMatchDefault(t *testing.T) {

testutil/metric.go

@@ -129,7 +129,7 @@ func IgnoreTime() cmp.Option {
 }
 
 // MetricEqual returns true if the metrics are equal.
-func MetricEqual(expected, actual telegraf.Metric) bool {
+func MetricEqual(expected, actual telegraf.Metric, opts ...cmp.Option) bool {
 	var lhs, rhs *metricDiff
 	if expected != nil {
 		lhs = newMetricDiff(expected)
@@ -138,7 +138,8 @@ func MetricEqual(expected, actual telegraf.Metric) bool {
 		rhs = newMetricDiff(actual)
 	}
 
-	return cmp.Equal(lhs, rhs)
+	opts = append(opts, cmpopts.EquateNaNs())
+	return cmp.Equal(lhs, rhs, opts...)
 }
 
 // RequireMetricEqual halts the test with an error if the metrics are not
@@ -154,6 +155,7 @@ func RequireMetricEqual(t *testing.T, expected, actual telegraf.Metric, opts ...
 		rhs = newMetricDiff(actual)
 	}
 
+	opts = append(opts, cmpopts.EquateNaNs())
 	if diff := cmp.Diff(lhs, rhs, opts...); diff != "" {
 		t.Fatalf("telegraf.Metric\n--- expected\n+++ actual\n%s", diff)
 	}
@@ -172,6 +174,8 @@ func RequireMetricsEqual(t *testing.T, expected, actual []telegraf.Metric, opts
 	for _, m := range actual {
 		rhs = append(rhs, newMetricDiff(m))
 	}
+
+	opts = append(opts, cmpopts.EquateNaNs())
 	if diff := cmp.Diff(lhs, rhs, opts...); diff != "" {
 		t.Fatalf("[]telegraf.Metric\n--- expected\n+++ actual\n%s", diff)
 	}