client_golang/registry_test.go

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// Copyright (c) 2013, Matt T. Proud
// All rights reserved.
//
// Use of this source code is governed by a BSD-style license that can be found
// in the LICENSE file.
package registry
import (
"bytes"
"fmt"
"github.com/prometheus/client_golang/metrics"
"github.com/prometheus/client_golang/utility/test"
"io"
"net/http"
"testing"
)
func testRegister(t test.Tester) {
var oldState = struct {
abortOnMisuse bool
debugRegistration bool
useAggressiveSanityChecks bool
}{
abortOnMisuse: abortOnMisuse,
debugRegistration: debugRegistration,
useAggressiveSanityChecks: useAggressiveSanityChecks,
}
defer func() {
abortOnMisuse = oldState.abortOnMisuse
debugRegistration = oldState.debugRegistration
useAggressiveSanityChecks = oldState.useAggressiveSanityChecks
}()
type input struct {
name string
baseLabels map[string]string
}
var scenarios = []struct {
inputs []input
outputs []bool
}{
{},
{
inputs: []input{
{
name: "my_name_without_labels",
},
},
outputs: []bool{
true,
},
},
{
inputs: []input{
{
name: "my_name_without_labels",
},
{
name: "another_name_without_labels",
},
},
outputs: []bool{
true,
true,
},
},
{
inputs: []input{
{
name: "",
},
},
outputs: []bool{
false,
},
},
{
inputs: []input{
{
name: "valid_name",
baseLabels: map[string]string{"name": "illegal_duplicate_name"},
},
},
outputs: []bool{
false,
},
},
{
inputs: []input{
{
name: "duplicate_names",
},
{
name: "duplicate_names",
},
},
outputs: []bool{
true,
false,
},
},
{
inputs: []input{
{
name: "duplicate_names_with_identical_labels",
baseLabels: map[string]string{"label": "value"},
},
{
name: "duplicate_names_with_identical_labels",
baseLabels: map[string]string{"label": "value"},
},
},
outputs: []bool{
true,
false,
},
},
{
inputs: []input{
{
name: "duplicate_names_with_dissimilar_labels",
baseLabels: map[string]string{"label": "foo"},
},
{
name: "duplicate_names_with_dissimilar_labels",
baseLabels: map[string]string{"label": "bar"},
},
},
outputs: []bool{
true,
false,
},
},
}
for i, scenario := range scenarios {
if len(scenario.inputs) != len(scenario.outputs) {
t.Fatalf("%d. expected scenario output length %d, got %d", i, len(scenario.inputs), len(scenario.outputs))
}
abortOnMisuse = false
debugRegistration = false
useAggressiveSanityChecks = true
registry := NewRegistry()
for j, input := range scenario.inputs {
actual := registry.Register(input.name, "", input.baseLabels, nil)
if scenario.outputs[j] != (actual == nil) {
t.Errorf("%d.%d. expected %s, got %s", i, j, scenario.outputs[j], actual)
}
}
}
}
func TestRegister(t *testing.T) {
testRegister(t)
}
func BenchmarkRegister(b *testing.B) {
for i := 0; i < b.N; i++ {
testRegister(b)
}
}
type fakeResponseWriter struct {
header http.Header
body bytes.Buffer
}
func (r *fakeResponseWriter) Header() http.Header {
return r.header
}
func (r *fakeResponseWriter) Write(d []byte) (l int, err error) {
return r.body.Write(d)
}
func (r *fakeResponseWriter) WriteHeader(c int) {
}
func testDecorateWriter(t test.Tester) {
type input struct {
headers map[string]string
body []byte
}
type output struct {
headers map[string]string
body []byte
}
var scenarios = []struct {
in input
out output
}{
{},
{
in: input{
headers: map[string]string{
"Accept-Encoding": "gzip,deflate,sdch",
},
body: []byte("Hi, mom!"),
},
out: output{
headers: map[string]string{
"Content-Encoding": "gzip",
},
body: []byte("\x1f\x8b\b\x00\x00\tn\x88\x00\xff\xf2\xc8\xd4Q\xc8\xcd\xcfU\x04\x04\x00\x00\xff\xff9C&&\b\x00\x00\x00"),
},
},
{
in: input{
headers: map[string]string{
"Accept-Encoding": "foo",
},
body: []byte("Hi, mom!"),
},
out: output{
headers: map[string]string{},
body: []byte("Hi, mom!"),
},
},
}
for i, scenario := range scenarios {
request, _ := http.NewRequest("GET", "/", nil)
for key, value := range scenario.in.headers {
request.Header.Add(key, value)
}
baseWriter := &fakeResponseWriter{
header: make(http.Header),
}
writer := decorateWriter(request, baseWriter)
for key, value := range scenario.out.headers {
if baseWriter.Header().Get(key) != value {
t.Errorf("%d. expected %s for header %s, got %s", i, value, key, baseWriter.Header().Get(key))
}
}
writer.Write(scenario.in.body)
if closer, ok := writer.(io.Closer); ok {
closer.Close()
}
if !bytes.Equal(scenario.out.body, baseWriter.body.Bytes()) {
t.Errorf("%d. expected %s for body, got %s", i, scenario.out.body, baseWriter.body.Bytes())
}
}
}
func TestDecorateWriter(t *testing.T) {
testDecorateWriter(t)
}
func BenchmarkDecorateWriter(b *testing.B) {
for i := 0; i < b.N; i++ {
testDecorateWriter(b)
}
}
func testDumpToWriter(t test.Tester) {
type input struct {
metrics map[string]metrics.Metric
}
var scenarios = []struct {
in input
out []byte
}{
{
out: []byte("[]"),
},
{
in: input{
metrics: map[string]metrics.Metric{
"foo": metrics.NewCounter(),
},
},
out: []byte("[{\"baseLabels\":{\"label_foo\":\"foo\",\"name\":\"foo\"},\"docstring\":\"metric foo\",\"metric\":{\"type\":\"counter\",\"value\":[]}}]"),
},
{
in: input{
metrics: map[string]metrics.Metric{
"foo": metrics.NewCounter(),
"bar": metrics.NewCounter(),
},
},
out: []byte("[{\"baseLabels\":{\"label_bar\":\"bar\",\"name\":\"bar\"},\"docstring\":\"metric bar\",\"metric\":{\"type\":\"counter\",\"value\":[]}},{\"baseLabels\":{\"label_foo\":\"foo\",\"name\":\"foo\"},\"docstring\":\"metric foo\",\"metric\":{\"type\":\"counter\",\"value\":[]}}]"),
},
}
for i, scenario := range scenarios {
registry := NewRegistry().(registry)
for name, metric := range scenario.in.metrics {
err := registry.Register(name, fmt.Sprintf("metric %s", name), map[string]string{fmt.Sprintf("label_%s", name): name}, metric)
if err != nil {
t.Errorf("%d. encountered error while registering metric %s", i, err)
}
}
actual := &bytes.Buffer{}
err := registry.dumpToWriter(actual)
if err != nil {
t.Errorf("%d. encountered error while dumping %s", i, err)
}
if !bytes.Equal(scenario.out, actual.Bytes()) {
t.Errorf("%d. expected %q for dumping, got %q", i, scenario.out, actual.Bytes())
}
}
}
func TestDumpToWriter(t *testing.T) {
testDumpToWriter(t)
}
func BenchmarkDumpToWriter(b *testing.B) {
for i := 0; i < b.N; i++ {
testDumpToWriter(b)
}
}