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Record metrics for invocations when they start

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* This experimental patch records metrics as invocations start
so that the metrics can be used to make better scale to zero
decisions in faas-idler.

Tested with Kubernetes on a single-node cluster, metrics
reported as expected. Existing metrics still report.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>
This commit is contained in:
Alex Ellis (OpenFaaS Ltd)
2019-12-19 10:18:28 +00:00
committed by Alex Ellis
parent 1eea381dd5
commit 96812d2cd8
11 changed files with 51 additions and 22 deletions
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7
gateway/handlers/forwarding_proxy.go
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@ -53,9 +53,12 @@ func MakeForwardingProxyHandler(proxy *types.HTTPClientReverseProxy,
return func(w http.ResponseWriter, r *http.Request) {
baseURL := baseURLResolver.Resolve(r)
originalURL := r.URL.String()
requestURL := urlPathTransformer.Transform(r)
for _, notifier := range notifiers {
notifier.Notify(r.Method, requestURL, originalURL, http.StatusProcessing, "started", time.Second*0)
}
start := time.Now()
statusCode, err := forwardRequest(w, r, proxy.Client, baseURL, requestURL, proxy.Timeout, writeRequestURI, serviceAuthInjector)
@ -66,7 +69,7 @@ func MakeForwardingProxyHandler(proxy *types.HTTPClientReverseProxy,
}
for _, notifier := range notifiers {
notifier.Notify(r.Method, requestURL, originalURL, statusCode, seconds)
notifier.Notify(r.Method, requestURL, originalURL, statusCode, "completed", seconds)
}
}
}