telegraf/testutil/metric.go

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package testutil
import (
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"reflect"
"sort"
"testing"
"time"
"github.com/google/go-cmp/cmp"
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"github.com/google/go-cmp/cmp/cmpopts"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/metric"
)
type metricDiff struct {
Measurement string
Tags []*telegraf.Tag
Fields []*telegraf.Field
Type telegraf.ValueType
Time time.Time
}
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func lessFunc(lhs, rhs *metricDiff) bool {
if lhs.Measurement != rhs.Measurement {
return lhs.Measurement < rhs.Measurement
}
for i := 0; ; i++ {
if i >= len(lhs.Tags) && i >= len(rhs.Tags) {
break
} else if i >= len(lhs.Tags) {
return true
} else if i >= len(rhs.Tags) {
return false
}
if lhs.Tags[i].Key != rhs.Tags[i].Key {
return lhs.Tags[i].Key < rhs.Tags[i].Key
}
if lhs.Tags[i].Value != rhs.Tags[i].Value {
return lhs.Tags[i].Value < rhs.Tags[i].Value
}
}
for i := 0; ; i++ {
if i >= len(lhs.Fields) && i >= len(rhs.Fields) {
break
} else if i >= len(lhs.Fields) {
return true
} else if i >= len(rhs.Fields) {
return false
}
if lhs.Fields[i].Key != rhs.Fields[i].Key {
return lhs.Fields[i].Key < rhs.Fields[i].Key
}
if lhs.Fields[i].Value != rhs.Fields[i].Value {
ltype := reflect.TypeOf(lhs.Fields[i].Value)
rtype := reflect.TypeOf(lhs.Fields[i].Value)
if ltype.Kind() != rtype.Kind() {
return ltype.Kind() < rtype.Kind()
}
switch v := lhs.Fields[i].Value.(type) {
case int64:
return v < lhs.Fields[i].Value.(int64)
case uint64:
return v < lhs.Fields[i].Value.(uint64)
case float64:
return v < lhs.Fields[i].Value.(float64)
case string:
return v < lhs.Fields[i].Value.(string)
case bool:
return !v
default:
panic("unknown type")
}
}
}
if lhs.Type != rhs.Type {
return lhs.Type < rhs.Type
}
if lhs.Time.UnixNano() != rhs.Time.UnixNano() {
return lhs.Time.UnixNano() < rhs.Time.UnixNano()
}
return false
}
func newMetricDiff(metric telegraf.Metric) *metricDiff {
if metric == nil {
return nil
}
m := &metricDiff{}
m.Measurement = metric.Name()
for _, tag := range metric.TagList() {
m.Tags = append(m.Tags, tag)
}
sort.Slice(m.Tags, func(i, j int) bool {
return m.Tags[i].Key < m.Tags[j].Key
})
for _, field := range metric.FieldList() {
m.Fields = append(m.Fields, field)
}
sort.Slice(m.Fields, func(i, j int) bool {
return m.Fields[i].Key < m.Fields[j].Key
})
m.Type = metric.Type()
m.Time = metric.Time()
return m
}
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// SortMetrics enables sorting metrics before comparison.
func SortMetrics() cmp.Option {
return cmpopts.SortSlices(lessFunc)
}
// MetricEqual returns true if the metrics are equal.
func MetricEqual(expected, actual telegraf.Metric) bool {
var lhs, rhs *metricDiff
if expected != nil {
lhs = newMetricDiff(expected)
}
if actual != nil {
rhs = newMetricDiff(actual)
}
return cmp.Equal(lhs, rhs)
}
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// RequireMetricEqual halts the test with an error if the metrics are not
// equal.
func RequireMetricEqual(t *testing.T, expected, actual telegraf.Metric) {
t.Helper()
var lhs, rhs *metricDiff
if expected != nil {
lhs = newMetricDiff(expected)
}
if actual != nil {
rhs = newMetricDiff(actual)
}
if diff := cmp.Diff(lhs, rhs); diff != "" {
t.Fatalf("telegraf.Metric\n--- expected\n+++ actual\n%s", diff)
}
}
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// RequireMetricsEqual halts the test with an error if the array of metrics
// are not equal.
func RequireMetricsEqual(t *testing.T, expected, actual []telegraf.Metric, opts ...cmp.Option) {
t.Helper()
lhs := make([]*metricDiff, 0, len(expected))
for _, m := range expected {
lhs = append(lhs, newMetricDiff(m))
}
rhs := make([]*metricDiff, 0, len(actual))
for _, m := range actual {
rhs = append(rhs, newMetricDiff(m))
}
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if diff := cmp.Diff(lhs, rhs, opts...); diff != "" {
t.Fatalf("[]telegraf.Metric\n--- expected\n+++ actual\n%s", diff)
}
}
// Metric creates a new metric or panics on error.
func MustMetric(
name string,
tags map[string]string,
fields map[string]interface{},
tm time.Time,
tp ...telegraf.ValueType,
) telegraf.Metric {
m, err := metric.New(name, tags, fields, tm, tp...)
if err != nil {
panic("MustMetric")
}
return m
}
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func FromTestMetric(met *Metric) telegraf.Metric {
m, err := metric.New(met.Measurement, met.Tags, met.Fields, met.Time)
if err != nil {
panic("MustMetric")
}
return m
}