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prom_multi_proc_test.go
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prom_multi_proc_test.go
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package main
import (
"bytes"
"encoding/json"
"fmt"
"log"
"strings"
"testing"
)
func getTestSpecs(t *testing.T, i int) []*MetricSpec {
specsStr := fmt.Sprintf(`[
{
"type": "counter",
"name": "test_%d_counter",
"help": "Test %d counter"
},
{
"type": "counter",
"name": "test_%d_counter_vec",
"help": "Test %d counter vector",
"labels": [
"one",
"two",
"three"
]
},
{
"type": "gauge",
"name": "test_%d_gauge",
"help": "Test %d gauge"
},
{
"type": "gauge",
"name": "test_%d_gauge_vec",
"help": "Test %d gauge vector",
"labels": [
"one",
"two",
"three"
]
},
{
"type": "histogram",
"name": "test_%d_histogram",
"help": "Test %d histogram"
},
{
"type": "histogram",
"name": "test_%d_histogram_vec",
"help": "Test %d histogram vector",
"labels": [
"one",
"two",
"three"
]
},
{
"type": "histogram",
"name": "test_%d_histogram_vec_buckets",
"help": "Test %d histogram vector",
"labels": [
"one",
"two",
"three"
],
"buckets": [0.1, 0.5, 0.9]
},
{
"type": "summary",
"name": "test_%d_summary",
"help": "Test %d summary"
},
{
"type": "summary",
"name": "test_%d_summary_vec",
"help": "Test %d summary vector",
"labels": [
"one",
"two",
"three"
]
},
{
"type": "summary",
"name": "test_%d_summary_vec_objectives",
"help": "Test %d summary vector",
"labels": [
"one",
"two",
"three"
],
"objectives": {
"0.1": 0.1,
"0.5": 0.5,
"0.9": 0.9
}
}
]`, []interface{}{i, i, i, i, i, i, i, i, i, i, i, i, i, i, i, i, i, i, i, i}...)
specsReader := strings.NewReader(specsStr)
specs, err := ReadSpecs(specsReader)
if err != nil {
t.Fatal(err)
}
return specs
}
func SetTestLogger() {
var out bytes.Buffer
logger = log.New(&out, "", log.LstdFlags)
}
func TestMetrics1(t *testing.T) {
SetTestLogger()
specs := getTestSpecs(t, 1)
if len(specs) != 10 {
t.Errorf("Expected 10 metric specs, but got %d", len(specs))
}
registry := NewRegistry()
for _, spec := range specs {
if err := registry.Register(spec); err != nil {
t.Fatal(err)
}
}
for _, spec := range specs {
var labelValues []string
if strings.Contains(spec.Name, "_vec") {
labelValues = []string{"a", "b", "c"}
}
var methods []string
switch spec.Type {
default:
t.Fatalf("Invalid metric handler type: %+v", spec)
case "counter", "counter_vec":
methods = []string{"inc", "add"}
case "gauge", "gauge_vec":
methods = []string{"set", "inc", "dec", "add", "sub", "set_to_current_time"}
case "histogram", "histogram_vec", "summary", "summary_vec":
methods = []string{"observe"}
}
if len(methods) == 0 {
t.Fatalf("No methods found for spec: %+v", spec)
}
for _, method := range methods {
m := Metric{
Name: spec.Name,
Method: method,
Value: 1.0,
LabelValues: labelValues,
}
if err := registry.Handle(&m); err != nil {
t.Fatal(err)
}
}
}
}
func TestMetrics2Fail(t *testing.T) {
SetTestLogger()
specs := getTestSpecs(t, 2)
if len(specs) != 10 {
t.Errorf("Expected 10 metric specs, but got %d", len(specs))
}
registry := NewRegistry()
for _, spec := range specs {
if err := registry.Register(spec); err != nil {
t.Fatal(err)
}
}
for _, spec := range specs {
var labelValues []string
if strings.Contains(spec.Name, "_vec") {
labelValues = []string{"a", "b", "c", "d"}
}
var methods []string
switch spec.Type {
default:
t.Fatalf("Invalid metric handler type: %+v", spec)
case "counter", "counter_vec":
methods = []string{"inc", "add"}
case "gauge", "gauge_vec":
methods = []string{"set", "inc", "dec", "add", "sub", "set_to_current_time"}
case "histogram", "histogram_vec", "summary", "summary_vec":
methods = []string{"observe"}
}
if len(methods) == 0 {
t.Fatalf("No methods found for spec: %+v", spec)
}
for _, method := range methods {
m := Metric{
Name: spec.Name,
Method: method,
Value: 1.0,
LabelValues: labelValues,
}
err := registry.Handle(&m)
if strings.Contains(spec.Name, "_vec") {
// here we expect failure due to label length miss-match
if err == nil {
t.Fatal(err)
}
} else {
if err != nil {
t.Fatal(err)
}
}
}
}
}
func TestMetrics3Rereg(t *testing.T) {
SetTestLogger()
specs := getTestSpecs(t, 3)
specsUpdate := getTestSpecs(t, 4)
if len(specs) != 10 {
t.Errorf("Expected 10 metric specs, but got %d", len(specs))
}
if len(specsUpdate) != 10 {
t.Errorf("Expected 10 metric specs, but got %d", len(specsUpdate))
}
registry := NewRegistry()
// register all of specs
for _, spec := range specs {
if err := registry.Register(spec); err != nil {
t.Fatal(err)
}
}
names := registry.Names()
// save specs[3] for later testing
mySpec := specs[3]
// emulate a USR1 with some of specsUpdate
specs[3] = specsUpdate[3]
specs[7] = specsUpdate[7]
// register all of specsUpdate
newNames := []string{}
for idx, spec := range specs {
err := registry.Register(spec)
if err != nil {
newNames = append(newNames, spec.Name)
}
if idx != 3 && idx != 7 {
if err == nil {
t.Fatalf("Expected spec %d to throw error, but did not", idx)
}
} else {
if err != nil {
t.Fatalf("Did not expect spec %d to throw error, but it did", idx)
}
}
}
unreg := sliceSubStr(names, newNames)
if len(unreg) != 2 {
t.Fatalf("Expected 2 specs to be unregistered, but got %d", len(unreg))
}
if !sliceContainsStr(unreg, mySpec.Name) {
t.Fatal("%s should be getting unregistered", mySpec.Name)
}
for _, name := range unreg {
if err := registry.Unregister(name); err != nil {
t.Fatal(err)
}
}
// modify a spec
mySpec.Labels = []string{"Now", "for", "something", "completely", "different"}
if err := registry.Register(mySpec); err == nil {
t.Fatal("Expected re-reg of spec to throw error, but did not.")
}
}
func TestMetrics5Multi(t *testing.T) {
SetTestLogger()
specs := getTestSpecs(t, 5)
metricCh := make(chan Metric)
dataCh := make(chan []byte)
registry := NewRegistry()
// register all of specs
for _, spec := range specs {
if err := registry.Register(spec); err != nil {
t.Fatal(err)
}
}
go DataParser(dataCh, metricCh)
data := []Metric{
Metric{
Name: "test_5_counter",
Method: "inc",
},
Metric{
Name: "test_5_gauge_vec",
LabelValues: []string{
"1",
"2",
"3",
},
Method: "add",
Value: 39.0,
},
}
b, err := json.Marshal(data)
if err != nil {
t.Fatal(err)
}
go func() {
dataCh <- b
}()
for i := 0; i < 2; i++ {
metric := <-metricCh
switch i {
default:
t.Fatalf("Invalid metric number: %d", i)
case 0:
if metric.Name != "test_5_counter" {
t.Fatalf("Expected metric 1 name to be 'test_5_counter', but was %s", metric.Name)
}
if metric.Method != "inc" {
t.Fatalf("Expected metric 1 method to be 'inc', but was %s", metric.Method)
}
if len(metric.LabelValues) != 0 {
t.Fatalf("Expected length of metric 1 label values to be to be 0, but was %d", len(metric.LabelValues))
}
if metric.Value != 0.0 {
t.Fatalf("Expected metric 1 value to be 0.0, but was %f", metric.Value)
}
case 1:
if metric.Name != "test_5_gauge_vec" {
t.Fatalf("Expected metric 2 name to be 'test_5_gauge_vec', but was %s", metric.Name)
}
if metric.Method != "add" {
t.Fatalf("Expected metric 2 method to be 'add', but was %s", metric.Method)
}
if len(metric.LabelValues) != 3 {
t.Fatalf("Expected length of metric 3 label values to be to be 3, but was %d", len(metric.LabelValues))
}
if metric.Value != 39.0 {
t.Fatalf("Expected metric 2 value to be 39.0, but was %f", metric.Value)
}
}
}
}