8000 add timeout for dns handlser by AndrewGodGivens · Pull Request #13977 · deckhouse/deckhouse · GitHub
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add timeout for dns handlser #13977

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add timeout for dns handlser #13977

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29 changes: 18 additions & 11 deletions modules/500-upmeter/images/smoke-mini/src/smoke-mini.go
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Original file line number Diff line number Diff line change
Expand Up @@ -132,21 +132,26 @@ func rootHandler(w http.ResponseWriter, r *http.Request) {
}

func dnsHandler(w http.ResponseWriter, r *http.Request) {
log.Info(r.RemoteAddr, r.RequestURI)
_, err := net.LookupIP("kubernetes.default")
if err != nil {
w.WriteHeader(500)
log.Error(err)
return
}
fmt.Fprintf(w, "ok")
timeout := 2 * time.Second
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
resolver := &net.Resolver{}
_, err := resolver.LookupIP(ctx, "ip", "kubernetes.default")

if err != nil {
w.WriteHeader(500)
log.Error(r.RemoteAddr, r.RequestURI, " Failed to resolve domain ", "kubernetes.default", err)
fmt.Fprintf(w, "Error: %v\n", err)
return
}
log.Info(r.RemoteAddr, r.RequestURI, " DNS resolution succeeded")
fmt.Fprintf(w, "ok")
}

// neighborHandler checks other smoke-mini pods availabilty. It gets responses from pods via
// headless single-instance service URL, e.g. for "c" it would be "http://smoke-mini-c:<port>", which
// targets single pod "smoke-mini-c-0".
func neighborHandler(w http.ResponseWriter, r *http.Request) {
log.Info(r.RemoteAddr, r.RequestURI)
for i := len(targetServices) - 1; i >= 0; i-- {
if podHost(targetServices[i]) == os.Getenv("HOSTNAME") {
targetServices = append(targetServices[:i], targetServices[i+1:]...)
Expand All @@ -171,10 +176,12 @@ func neighborHandler(w http.ResponseWriter, r *http.Request) {
errorCount++
}
} else {
log.Error(r.RemoteAddr, r.RequestURI, " Failed to check neighbor ")
w.WriteHeader(500)
return
}
}
log.Info(r.RemoteAddr, r.RequestURI, " Check neighbor succeeded")
fmt.Fprintf(w, "ok")
}

Expand All @@ -184,7 +191,6 @@ func neighborHandler(w http.ResponseWriter, r *http.Request) {
func neighborViaServiceHandler(w http.ResponseWriter, r *http.Request) {
maxErrors := 2

log.Info(r.RemoteAddr, r.RequestURI)
client := http.Client{Timeout: 2 * time.Second}

errorCount := 0
Expand All @@ -204,11 +210,12 @@ func neighborViaServiceHandler(w http.ResponseWriter, r *http.Request) {
errorCount++
}
} else {
log.Error(r.RemoteAddr, r.RequestURI, " Failed to check neighborViaService")
w.WriteHeader(500)
return
}
}

log.Info(r.RemoteAddr, r.RequestURI, " Check neighborViaService succeeded")
fmt.Fprintf(w, "ok")
}

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