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tsweb: clean up pprof handler registration, document why it's there

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Updates #cleanup

Signed-off-by: David Anderson <danderson@tailscale.com>
This commit is contained in:
David Anderson 2023-08-22 18:54:46 -07:00 committed by Dave Anderson
parent 09068f6c16
commit 5cfa85e604
1 changed files with 24 additions and 8 deletions
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32
tsweb/debug.go
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@ -48,16 +48,19 @@ func Debugger(mux *http.ServeMux) *DebugHandler {
}
mux.Handle("/debug/", ret)
// Register this one directly on mux, rather than using
// ret.URL/etc, as we don't need another line of output on the
// index page. The /pprof/ index already covers it.
mux.Handle("/debug/pprof/profile", BrowserHeaderHandler(http.HandlerFunc(pprof.Profile)))
ret.KVFunc("Uptime", func() any { return varz.Uptime() })
ret.KV("Version", version.Long())
ret.Handle("vars", "Metrics (Go)", expvar.Handler())
ret.Handle("varz", "Metrics (Prometheus)", http.HandlerFunc(promvarz.Handler))
ret.Handle("pprof/", "pprof", http.HandlerFunc(pprof.Index))
ret.Handle("pprof/", "pprof (index)", http.HandlerFunc(pprof.Index))
// the CPU profile handler is special because it responds
// streamily, unlike every other pprof handler. This means it's
// not made available through pprof.Index the way all the other
// pprof types are, you have to register the CPU profile handler
// separately. Use HandleSilent for that to not pollute the human
// debug list with a link that produces streaming line noise if
// you click it.
ret.HandleSilent("pprof/profile", http.HandlerFunc(pprof.Profile))
ret.URL("/debug/pprof/goroutine?debug=1", "Goroutines (collapsed)")
ret.URL("/debug/pprof/goroutine?debug=2", "Goroutines (full)")
ret.Handle("gc", "force GC", http.HandlerFunc(gcHandler))
@ -94,14 +97,27 @@ func (d *DebugHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
}
}
func (d *DebugHandler) handle(slug string, handler http.Handler) string {
href := "/debug/" + slug
d.mux.Handle(href, Protected(debugBrowserHeaderHandler(handler)))
return href
}
// Handle registers handler at /debug/<slug> and creates a descriptive
// entry in /debug/ for it.
func (d *DebugHandler) Handle(slug, desc string, handler http.Handler) {
href := "/debug/" + slug
d.mux.Handle(href, Protected(debugBrowserHeaderHandler(handler)))
href := d.handle(slug, handler)
d.URL(href, desc)
}
// HandleSilent registers handler at /debug/<slug>. It does not create
// a descriptive entry in /debug/ for it. This should be used
// sparingly, for things that need to be registered but would pollute
// the list of debug links.
func (d *DebugHandler) HandleSilent(slug string, handler http.Handler) {
d.handle(slug, handler)
}
// KV adds a key/value list item to /debug/.
func (d *DebugHandler) KV(k string, v any) {
val := html.EscapeString(fmt.Sprintf("%v", v))