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cmd/derpprobe: use a status page from the prober library

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Updates tailscale/corp#20583

Signed-off-by: Anton Tolchanov <anton@tailscale.com>
This commit is contained in:
Anton Tolchanov 2024-07-31 09:03:14 +01:00 committed by Anton Tolchanov
parent 9106187a95
commit b3fc345aba
1 changed files with 7 additions and 27 deletions
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34
cmd/derpprobe/derpprobe.go
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@ -7,8 +7,6 @@
import (
"flag"
"fmt"
"html"
"io"
"log"
"net/http"
"sort"
@ -70,8 +68,13 @@ func main() {
}
mux := http.NewServeMux()
tsweb.Debugger(mux)
mux.HandleFunc("/", http.HandlerFunc(serveFunc(p)))
d := tsweb.Debugger(mux)
d.Handle("probe-run", "Run a probe", tsweb.StdHandler(tsweb.ReturnHandlerFunc(p.RunHandler), tsweb.HandlerOptions{Logf: log.Printf}))
mux.Handle("/", tsweb.StdHandler(p.StatusHandler(
prober.WithTitle("DERP Prober"),
prober.WithPageLink("Prober metrics", "/debug/varz"),
prober.WithProbeLink("Run Probe", "/debug/probe-run?name={{.Name}}"),
), tsweb.HandlerOptions{Logf: log.Printf}))
log.Printf("Listening on %s", *listen)
log.Fatal(http.ListenAndServe(*listen, mux))
}
@ -105,26 +108,3 @@ func getOverallStatus(p *prober.Prober) (o overallStatus) {
sort.Strings(o.good)
return
}
func serveFunc(p *prober.Prober) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
st := getOverallStatus(p)
summary := "All good"
if (float64(len(st.bad)) / float64(len(st.bad)+len(st.good))) > 0.25 {
// Returning a 500 allows monitoring this server externally and configuring
// an alert on HTTP response code.
w.WriteHeader(500)
summary = fmt.Sprintf("%d problems", len(st.bad))
}
io.WriteString(w, "<html><head><style>.bad { font-weight: bold; color: #700; }</style></head>\n")
fmt.Fprintf(w, "<body><h1>derp probe</h1>\n%s:<ul>", summary)
for _, s := range st.bad {
fmt.Fprintf(w, "<li class=bad>%s</li>\n", html.EscapeString(s))
}
for _, s := range st.good {
fmt.Fprintf(w, "<li>%s</li>\n", html.EscapeString(s))
}
io.WriteString(w, "</ul></body></html>\n")
}
}