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issue #746: return 429 Too Many Requests if requests stack up #747

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issue #746: return 429 Too Many Requests if requests stack up #747

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9 changes: 9 additions & 0 deletions mysqld_exporter.go
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Original file line number Diff line number Diff line change
Expand Up @@ -132,7 +132,16 @@ func init() {
}

func newHandler(scrapers []collector.Scraper, logger log.Logger) http.HandlerFunc {
processing := false
return func(w http.ResponseWriter, r *http.Request) {
if processing {
log.Info("Received metrics request while previous still in progress: returning 429 Too Many Requests")
http.Error(w, "429 Too Many Requests", http.StatusTooManyRequests)
return
}
processing = true
defer func() { processing = false }()

var dsn string
var err error
target := ""
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