116 lines
2.8 KiB
Go
116 lines
2.8 KiB
Go
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// Copyright 2021 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build ignore
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// +build ignore
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package main
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import (
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"bytes"
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"fmt"
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"go/format"
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"log"
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"os"
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"runtime/metrics"
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"strconv"
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"strings"
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"text/template"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/internal"
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)
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func main() {
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if len(os.Args) != 2 {
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log.Fatal("requires Go version (e.g. go1.17) as an argument")
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}
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version, err := parseVersion(os.Args[1])
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if err != nil {
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log.Fatalf("parsing Go version: %v", err)
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}
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// Generate code.
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var buf bytes.Buffer
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err = testFile.Execute(&buf, struct {
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Descriptions []metrics.Description
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GoVersion goVersion
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}{
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Descriptions: metrics.All(),
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GoVersion: version,
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})
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if err != nil {
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log.Fatalf("executing template: %v", err)
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}
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// Format it.
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result, err := format.Source(buf.Bytes())
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if err != nil {
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log.Fatalf("formatting code: %v", err)
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}
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// Write it to a file.
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fname := fmt.Sprintf("go_collector_metrics_%s_test.go", version.Abbr())
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if err := os.WriteFile(fname, result, 0o644); err != nil {
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log.Fatalf("writing file: %v", err)
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}
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}
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type goVersion int
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func (g goVersion) String() string {
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return fmt.Sprintf("go1.%d", g)
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}
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func (g goVersion) Abbr() string {
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return fmt.Sprintf("go1%d", g)
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}
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func parseVersion(s string) (goVersion, error) {
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i := strings.IndexRune(s, '.')
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if i < 0 {
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return goVersion(-1), fmt.Errorf("bad Go version format")
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}
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i, err := strconv.Atoi(s[i+1:])
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return goVersion(i), err
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}
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var testFile = template.Must(template.New("testFile").Funcs(map[string]interface{}{
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"rm2prom": func(d metrics.Description) string {
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ns, ss, n, ok := internal.RuntimeMetricsToProm(&d)
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if !ok {
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return ""
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}
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return prometheus.BuildFQName(ns, ss, n)
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},
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"nextVersion": func(version goVersion) string {
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return (version + goVersion(1)).String()
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},
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}).Parse(`// Code generated by gen_go_collector_metrics_set.go; DO NOT EDIT.
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//go:generate go run gen_go_collector_metrics_set.go {{.GoVersion}}
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//go:build {{.GoVersion}} && !{{nextVersion .GoVersion}}
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// +build {{.GoVersion}},!{{nextVersion .GoVersion}}
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package prometheus
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var expectedRuntimeMetrics = map[string]string{
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{{- range .Descriptions -}}
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{{- $trans := rm2prom . -}}
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{{- if ne $trans "" }}
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{{.Name | printf "%q"}}: {{$trans | printf "%q"}},
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{{- end -}}
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{{end}}
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}
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`))
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