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middleware/proxy: add request duration monitoring (#362)

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Add a separate request duration metrics specially for proxying requests
upstream.

Fixes #259
This commit is contained in:
Miek Gieben
2016-10-28 12:54:49 +01:00
committed by GitHub
parent ba26f47d5c
commit 54964653d1
5 changed files with 52 additions and 2 deletions
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9
middleware/proxy/proxy.go
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@@ -74,6 +74,9 @@ func (p Proxy) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (
for time.Now().Sub(start) < tryDuration {
host := upstream.Select()
if host == nil {
RequestDuration.WithLabelValues(upstream.From()).Observe(float64(time.Since(start) / time.Millisecond))
return dns.RcodeServerFailure, errUnreachable
}
@@ -85,6 +88,9 @@ func (p Proxy) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (
if backendErr == nil {
w.WriteMsg(reply)
RequestDuration.WithLabelValues(upstream.From()).Observe(float64(time.Since(start) / time.Millisecond))
return 0, nil
}
timeout := host.FailTimeout
@@ -97,6 +103,9 @@ func (p Proxy) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (
atomic.AddInt32(&host.Fails, -1)
}(host, timeout)
}
RequestDuration.WithLabelValues(upstream.From()).Observe(float64(time.Since(start) / time.Millisecond))
return dns.RcodeServerFailure, errUnreachable
}
return p.Next.ServeDNS(ctx, w, r)