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// Copyright 2016 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package version
import (
"bytes"
"fmt"
"runtime"
"strings"
"text/template"
"github.com/prometheus/client_golang/prometheus"
)
// Build information. Populated at build-time.
var (
Version string
Revision string
Branch string
BuildUser string
BuildDate string
GoVersion = runtime.Version()
)
// NewCollector returns a collector which exports metrics about current version information.
func NewCollector(program string) *prometheus.GaugeVec {
buildInfo := prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: program,
Name: "build_info",
Help: fmt.Sprintf(
"A metric with a constant '1' value labeled by version, revision, branch, and goversion from which %s was built.",
program,
),
},
[]string{"version", "revision", "branch", "goversion"},
)
buildInfo.WithLabelValues(Version, Revision, Branch, GoVersion).Set(1)
return buildInfo
}
// versionInfoTmpl contains the template used by Info.
var versionInfoTmpl = `
{{.program}}, version {{.version}} (branch: {{.branch}}, revision: {{.revision}})
build user: {{.buildUser}}
build date: {{.buildDate}}
go version: {{.goVersion}}
`
// Print returns version information.
func Print(program string) string {
m := map[string]string{
"program": program,
"version": Version,
"revision": Revision,
"branch": Branch,
"buildUser": BuildUser,
"buildDate": BuildDate,
"goVersion": GoVersion,
}
t := template.Must(template.New("version").Parse(versionInfoTmpl))
var buf bytes.Buffer
if err := t.ExecuteTemplate(&buf, "version", m); err != nil {
panic(err)
}
return strings.TrimSpace(buf.String())
}
// Info returns version, branch and revision information.
func Info() string {
return fmt.Sprintf("(version=%s, branch=%s, revision=%s)", Version, Branch, Revision)
}
// BuildContext returns goVersion, buildUser and buildDate information.
func BuildContext() string {
return fmt.Sprintf("(go=%s, user=%s, date=%s)", GoVersion, BuildUser, BuildDate)
}
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