telegraf/testutil/accumulator.go

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package testutil
import (
"encoding/json"
"fmt"
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"reflect"
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"sync"
"sync/atomic"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
)
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// Metric defines a single point measurement
type Metric struct {
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Measurement string
Tags map[string]string
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Fields map[string]interface{}
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Time time.Time
}
func (p *Metric) String() string {
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return fmt.Sprintf("%s %v", p.Measurement, p.Fields)
}
// Accumulator defines a mocked out accumulator
type Accumulator struct {
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sync.Mutex
Metrics []*Metric
nMetrics uint64
Discard bool
Errors []error
debug bool
}
func (a *Accumulator) NMetrics() uint64 {
return atomic.LoadUint64(&a.nMetrics)
}
func (a *Accumulator) ClearMetrics() {
atomic.StoreUint64(&a.nMetrics, 0)
a.Lock()
defer a.Unlock()
a.Metrics = make([]*Metric, 0)
}
// AddFields adds a measurement point with a specified timestamp.
func (a *Accumulator) AddFields(
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measurement string,
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fields map[string]interface{},
tags map[string]string,
timestamp ...time.Time,
) {
atomic.AddUint64(&a.nMetrics, 1)
if a.Discard {
return
}
a.Lock()
defer a.Unlock()
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if tags == nil {
tags = map[string]string{}
}
if len(fields) == 0 {
return
}
var t time.Time
if len(timestamp) > 0 {
t = timestamp[0]
} else {
t = time.Now()
}
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if a.debug {
pretty, _ := json.MarshalIndent(fields, "", " ")
prettyTags, _ := json.MarshalIndent(tags, "", " ")
msg := fmt.Sprintf("Adding Measurement [%s]\nFields:%s\nTags:%s\n",
measurement, string(pretty), string(prettyTags))
fmt.Print(msg)
}
p := &Metric{
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Measurement: measurement,
Fields: fields,
Tags: tags,
Time: t,
}
a.Metrics = append(a.Metrics, p)
}
func (a *Accumulator) AddCounter(
measurement string,
fields map[string]interface{},
tags map[string]string,
timestamp ...time.Time,
) {
a.AddFields(measurement, fields, tags, timestamp...)
}
func (a *Accumulator) AddGauge(
measurement string,
fields map[string]interface{},
tags map[string]string,
timestamp ...time.Time,
) {
a.AddFields(measurement, fields, tags, timestamp...)
}
// AddError appends the given error to Accumulator.Errors.
func (a *Accumulator) AddError(err error) {
if err == nil {
return
}
a.Lock()
a.Errors = append(a.Errors, err)
a.Unlock()
}
func (a *Accumulator) SetPrecision(precision, interval time.Duration) {
return
}
func (a *Accumulator) DisablePrecision() {
return
}
func (a *Accumulator) Debug() bool {
// stub for implementing Accumulator interface.
return a.debug
}
func (a *Accumulator) SetDebug(debug bool) {
// stub for implementing Accumulator interface.
a.debug = debug
}
// Get gets the specified measurement point from the accumulator
func (a *Accumulator) Get(measurement string) (*Metric, bool) {
for _, p := range a.Metrics {
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if p.Measurement == measurement {
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return p, true
}
}
return nil, false
}
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// NFields returns the total number of fields in the accumulator, across all
// measurements
func (a *Accumulator) NFields() int {
a.Lock()
defer a.Unlock()
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counter := 0
for _, pt := range a.Metrics {
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for _, _ = range pt.Fields {
counter++
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}
}
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return counter
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}
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func (a *Accumulator) AssertContainsTaggedFields(
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t *testing.T,
measurement string,
fields map[string]interface{},
tags map[string]string,
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) {
a.Lock()
defer a.Unlock()
for _, p := range a.Metrics {
if !reflect.DeepEqual(tags, p.Tags) {
continue
}
if p.Measurement == measurement {
assert.Equal(t, fields, p.Fields)
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return
}
}
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msg := fmt.Sprintf("unknown measurement %s with tags %v", measurement, tags)
assert.Fail(t, msg)
}
func (a *Accumulator) AssertContainsFields(
t *testing.T,
measurement string,
fields map[string]interface{},
) {
a.Lock()
defer a.Unlock()
for _, p := range a.Metrics {
if p.Measurement == measurement {
assert.Equal(t, fields, p.Fields)
return
}
}
msg := fmt.Sprintf("unknown measurement %s", measurement)
assert.Fail(t, msg)
}
func (a *Accumulator) AssertDoesNotContainMeasurement(t *testing.T, measurement string) {
a.Lock()
defer a.Unlock()
for _, p := range a.Metrics {
if p.Measurement == measurement {
msg := fmt.Sprintf("found unexpected measurement %s", measurement)
assert.Fail(t, msg)
}
}
}
// HasIntValue returns true if the measurement has an Int value
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func (a *Accumulator) HasIntField(measurement string, field string) bool {
a.Lock()
defer a.Unlock()
for _, p := range a.Metrics {
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if p.Measurement == measurement {
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for fieldname, value := range p.Fields {
if fieldname == field {
_, ok := value.(int64)
return ok
}
}
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}
}
return false
}
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// HasUIntValue returns true if the measurement has a UInt value
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func (a *Accumulator) HasUIntField(measurement string, field string) bool {
a.Lock()
defer a.Unlock()
for _, p := range a.Metrics {
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if p.Measurement == measurement {
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for fieldname, value := range p.Fields {
if fieldname == field {
_, ok := value.(uint64)
return ok
}
}
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}
}
return false
}
// HasFloatValue returns true if the given measurement has a float value
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func (a *Accumulator) HasFloatField(measurement string, field string) bool {
a.Lock()
defer a.Unlock()
for _, p := range a.Metrics {
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if p.Measurement == measurement {
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for fieldname, value := range p.Fields {
if fieldname == field {
_, ok := value.(float64)
return ok
}
}
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}
}
return false
}
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// HasMeasurement returns true if the accumulator has a measurement with the
// given name
func (a *Accumulator) HasMeasurement(measurement string) bool {
a.Lock()
defer a.Unlock()
for _, p := range a.Metrics {
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if p.Measurement == measurement {
return true
}
}
return false
}