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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package metrics_test
import (
"bufio"
"os"
"path/filepath"
"regexp"
"runtime"
"runtime/metrics"
"strings"
"testing"
)
func TestDescriptionNameFormat(t *testing.T) {
r := regexp.MustCompile("^(?P<name>/[^:]+):(?P<unit>[^:*/]+(?:[*/][^:*/]+)*)$")
descriptions := metrics.All()
for _, desc := range descriptions {
if !r.MatchString(desc.Name) {
t.Errorf("metrics %q does not match regexp %s", desc.Name, r)
}
}
}
func extractMetricDocs(t *testing.T) map[string]string {
if runtime.GOOS == "android" {
t.Skip("no access to Go source on android")
}
// Get doc.go.
_, filename, _, _ := runtime.Caller(0)
filename = filepath.Join(filepath.Dir(filename), "doc.go")
f, err := os.Open(filename)
if err != nil {
t.Fatal(err)
}
const (
stateSearch = iota // look for list of metrics
stateNextMetric // look for next metric
stateNextDescription // build description
)
state := stateSearch
s := bufio.NewScanner(f)
result := make(map[string]string)
var metric string
var prevMetric string
var desc strings.Builder
for s.Scan() {
line := strings.TrimSpace(s.Text())
switch state {
case stateSearch:
if line == "Supported metrics" {
state = stateNextMetric
}
case stateNextMetric:
// Ignore empty lines until we find a non-empty
// one. This will be our metric name.
if len(line) != 0 {
prevMetric = metric
metric = line
if prevMetric > metric {
t.Errorf("metrics %s and %s are out of lexicographical order", prevMetric, metric)
}
state = stateNextDescription
}
case stateNextDescription:
if len(line) == 0 || line == `*/` {
// An empty line means we're done.
// Write down the description and look
// for a new metric.
result[metric] = desc.String()
desc.Reset()
state = stateNextMetric
} else {
// As long as we're seeing data, assume that's
// part of the description and append it.
if desc.Len() != 0 {
// Turn previous newlines into spaces.
desc.WriteString(" ")
}
desc.WriteString(line)
}
}
if line == `*/` {
break
}
}
if state == stateSearch {
t.Fatalf("failed to find supported metrics docs in %s", filename)
}
return result
}
func TestDescriptionDocs(t *testing.T) {
docs := extractMetricDocs(t)
descriptions := metrics.All()
for _, d := range descriptions {
want := d.Description
got, ok := docs[d.Name]
if !ok {
t.Errorf("no docs found for metric %s", d.Name)
continue
}
if got != want {
t.Errorf("mismatched description and docs for metric %s", d.Name)
t.Errorf("want: %q, got %q", want, got)
continue
}
}
if len(docs) > len(descriptions) {
docsLoop:
for name, _ := range docs {
for _, d := range descriptions {
if name == d.Name {
continue docsLoop
}
}
t.Errorf("stale documentation for non-existent metric: %s", name)
}
}
}
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