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chasquid: Include build and version information

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This patch adds the possibility of setting build and version
information, which will be exported and displayed in the monitoring http
server.
This commit is contained in:
Alberto Bertogli
2016-10-22 09:32:06 +01:00
parent 67fe5b50a5
commit c87c5ec1bc
1 changed files with 64 additions and 3 deletions
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67
chasquid.go
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@@ -1,14 +1,17 @@
package main
import (
"expvar"
"flag"
"fmt"
"html/template"
"io/ioutil"
"math/rand"
"net"
"os"
"os/signal"
"path/filepath"
"strconv"
"syscall"
"time"
@@ -30,11 +33,35 @@ import (
var (
configDir = flag.String("config_dir", "/etc/chasquid",
"configuration directory")
showVer = flag.Bool("version", false, "show version and exit")
)
// Build information, overridden at build time using
// -ldflags="-X main.version=blah".
var (
version = "undefined"
sourceDateTs = "0"
)
var (
versionVar = expvar.NewString("chasquid/version")
sourceDate time.Time
sourceDateVar = expvar.NewString("chasquid/sourceDateStr")
sourceDateTsVar = expvar.NewInt("chasquid/sourceDateTimestamp")
)
func main() {
flag.Parse()
parseVersionInfo()
if *showVer {
fmt.Printf("chasquid %s (source date: %s)\n", version, sourceDate)
return
}
glog.Infof("chasquid starting (version %s)", version)
setupSignalHandling()
defer glog.Flush()
@@ -223,15 +250,40 @@ func mustReadDir(path string) []os.FileInfo {
return dirs
}
func parseVersionInfo() {
versionVar.Set(version)
sdts, err := strconv.ParseInt(sourceDateTs, 10, 0)
if err != nil {
panic(err)
}
sourceDate = time.Unix(sdts, 0)
sourceDateVar.Set(sourceDate.Format("2006-01-02 15:04:05 -0700"))
sourceDateTsVar.Set(sdts)
}
func launchMonitoringServer(addr string) {
glog.Infof("Monitoring HTTP server listening on %s", addr)
indexData := struct {
Version string
SourceDate time.Time
StartTime time.Time
}{
Version: version,
SourceDate: sourceDate,
StartTime: time.Now(),
}
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
http.NotFound(w, r)
return
}
w.Write([]byte(monitoringHTMLIndex))
if err := monitoringHTMLIndex.Execute(w, indexData); err != nil {
glog.Infof("monitoring handler error: %v", err)
}
})
flags := dumpFlags()
@@ -243,13 +295,22 @@ func launchMonitoringServer(addr string) {
}
// Static index for the monitoring website.
const monitoringHTMLIndex = `<!DOCTYPE html>
var monitoringHTMLIndex = template.Must(template.New("index").Funcs(
template.FuncMap{"since": time.Since}).Parse(
`<!DOCTYPE html>
<html>
<head>
<title>chasquid monitoring</title>
</head>
<body>
<h1>chasquid monitoring</h1>
chasquid {{.Version}}<br>
source date {{.SourceDate.Format "2006-01-02 15:04:05 -0700"}}<p>
started {{.StartTime.Format "Mon, 2006-01-02 15:04:05 -0700"}}<br>
up since {{.StartTime | since}}<p>
<ul>
<li><a href="/debug/queue">queue</a>
<li><a href="/debug/vars">exported variables</a>
@@ -270,7 +331,7 @@ const monitoringHTMLIndex = `<!DOCTYPE html>
</ul>
</body>
</html>
`
`))
// dumpFlags to a string, for troubleshooting purposes.
func dumpFlags() string {