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monitoring: Reorganize index structure

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This patch improves the organization of the monitoring index page:

- Include the hostname (both OS and configured) for convenience.
- Round the uptime presentation for readability.
- Add a tiny CSS for consistency with the traces.
- Re-arrange the list of links for readability.
This commit is contained in:
Alberto Bertogli
2020-07-08 23:07:43 +01:00
parent a08b86a663
commit 33446fd565
2 changed files with 68 additions and 44 deletions
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2
chasquid.go
View File

@@ -91,7 +91,7 @@ func main() {
go signalHandler()
if conf.MonitoringAddress != "" {
launchMonitoringServer(conf.MonitoringAddress)
launchMonitoringServer(conf)
}
s := smtpsrv.NewServer()

82
monitoring.go
View File

@@ -5,25 +5,33 @@ import (
"fmt"
"html/template"
"net/http"
"os"
"time"
"blitiri.com.ar/go/chasquid/internal/config"
"blitiri.com.ar/go/log"
// To enable live profiling in the monitoring server.
_ "net/http/pprof"
)
func launchMonitoringServer(addr string) {
log.Infof("Monitoring HTTP server listening on %s", addr)
func launchMonitoringServer(conf *config.Config) {
log.Infof("Monitoring HTTP server listening on %s", conf.MonitoringAddress)
osHostname, _ := os.Hostname()
indexData := struct {
Version string
SourceDate time.Time
StartTime time.Time
Config *config.Config
Hostname string
}{
Version: version,
SourceDate: sourceDate,
StartTime: time.Now(),
Config: conf,
Hostname: osHostname,
}
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
@@ -36,70 +44,86 @@ func launchMonitoringServer(addr string) {
}
})
flags := dumpFlags()
http.HandleFunc("/debug/flags", func(w http.ResponseWriter, r *http.Request) {
_, _ = w.Write([]byte(flags))
})
http.HandleFunc("/debug/flags", debugFlagsHandler)
go http.ListenAndServe(addr, nil)
go http.ListenAndServe(conf.MonitoringAddress, nil)
}
// Functions available inside the templates.
var tmplFuncs = template.FuncMap{
"since": time.Since,
"roundDuration": roundDuration,
}
// Static index for the monitoring website.
var monitoringHTMLIndex = template.Must(template.New("index").Funcs(
template.FuncMap{"since": time.Since}).Parse(
var monitoringHTMLIndex = template.Must(
template.New("index").Funcs(tmplFuncs).Parse(
`<!DOCTYPE html>
<html>
<head>
<title>chasquid monitoring</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>{{.Hostname}}: chasquid monitoring</title>
<style type="text/css">
body {
font-family: sans-serif;
}
</style>
</head>
<body>
<h1>chasquid monitoring</h1>
<h1>chasquid @{{.Config.Hostname}}</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>
up for {{.StartTime | since | roundDuration}}<br>
os hostname <i>{{.Hostname}}</i><p>
<ul>
<li><a href="/debug/queue">queue</a>
<li><a href="/debug/vars">exported variables</a>
<small><a href="https://golang.org/pkg/expvar/">(ref)</a></small>
<li>traces <small><a href="https://godoc.org/golang.org/x/net/trace">
(ref)</a></small>
<li>monitoring
<ul>
<li><a href="/debug/requests?exp=1">requests (short-lived)</a>
<li><a href="/debug/events?exp=1">events (long-lived)</a>
<li><a href="/debug/vars">exported variables</a>
<small><a href="https://golang.org/pkg/expvar/">(ref)</a></small>
</ul>
<li><a href="/debug/flags">flags</a>
<li><a href="/debug/pprof">pprof</a>
<small><a href="https://golang.org/pkg/net/http/pprof/">
(ref)</a></small>
<li>execution
<ul>
<li><a href="/debug/flags">flags</a>
<li><a href="/debug/pprof/cmdline">command line</a>
</ul>
<li><a href="/debug/pprof">pprof</a>
<small><a href="https://golang.org/pkg/net/http/pprof/">(ref)</a></small>
<ul>
<li><a href="/debug/pprof/goroutine?debug=1">goroutines</a>
</ul>
</ul>
</body>
</html>
`))
// dumpFlags to a string, for troubleshooting purposes.
func dumpFlags() string {
s := ""
func debugFlagsHandler(w http.ResponseWriter, r *http.Request) {
visited := make(map[string]bool)
// Print set flags first, then the rest.
flag.Visit(func(f *flag.Flag) {
s += fmt.Sprintf("-%s=%s\n", f.Name, f.Value.String())
fmt.Fprintf(w, "-%s=%s\n", f.Name, f.Value.String())
visited[f.Name] = true
})
s += "\n"
fmt.Fprintf(w, "\n")
flag.VisitAll(func(f *flag.Flag) {
if !visited[f.Name] {
s += fmt.Sprintf("-%s=%s\n", f.Name, f.Value.String())
fmt.Fprintf(w, "-%s=%s\n", f.Name, f.Value.String())
}
})
return s
}
func roundDuration(d time.Duration) time.Duration {
return d.Round(time.Second)
}