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tsweb: add StatusCodeCounters to HandlerOptions

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This lets servers using tsweb register expvars
that will track the number of requests ending
in 200s/300s/400s/500s.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
This commit is contained in:
Josh Bleecher Snyder 2020-10-29 15:44:46 -07:00 committed by Josh Bleecher Snyder
parent e98f2c57d6
commit 3b46655dbb
1 changed files with 9 additions and 0 deletions
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9
tsweb/tsweb.go
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@ -161,6 +161,11 @@ type HandlerOptions struct {
Quiet200s bool // if set, do not log successfully handled HTTP requests
Logf logger.Logf
Now func() time.Time // if nil, defaults to time.Now
// If non-nil, StatusCodeCounters maintains counters
// of status codes for handled responses.
// The keys are "1xx", "2xx", "3xx", "4xx", and "5xx".
StatusCodeCounters *expvar.Map
}
// StdHandler converts a ReturnHandler into a standard http.Handler.
@ -278,6 +283,10 @@ func (h retHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if msg.Code != 200 || !h.opts.Quiet200s {
h.opts.Logf("%s", msg)
}
if h.opts.StatusCodeCounters != nil {
key := fmt.Sprintf("%dxx", msg.Code/100)
h.opts.StatusCodeCounters.Add(key, 1)
}
}