52e01264e8
By defining and using an proxy.Exchanger interface we make the proxy more generic and we can then fold back httproxy into proxy. This overrides #463 and #473 and should make futures extensions rather trivial * Add docs that talk about `protocol` and how to set it. * middleware/proxy: rename New to NewLookup It's used as a Lookup mechanism not as a completely new proxy, reflect that in the name. * Set maxfails to 3 by default when looking up names. Most of the changes have been copied from https://github.com/johnbelamaric/coredns/pull/1/files
30 lines
795 B
Go
30 lines
795 B
Go
package proxy
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import (
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"sync"
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"github.com/miekg/coredns/middleware"
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"github.com/prometheus/client_golang/prometheus"
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)
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// Metrics the proxy middleware exports.
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var (
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RequestDuration = prometheus.NewHistogramVec(prometheus.HistogramOpts{
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Namespace: middleware.Namespace,
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Subsystem: "proxy",
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Name: "request_duration_milliseconds",
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Buckets: append(prometheus.DefBuckets, []float64{50, 100, 200, 500, 1000, 2000, 3000, 4000, 5000, 10000}...),
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Help: "Histogram of the time (in milliseconds) each request took.",
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}, []string{"protocol", "zone"})
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)
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// OnStartup sets up the metrics on startup. This is done for all proxy protocols.
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func OnStartup() error {
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metricsOnce.Do(func() {
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prometheus.MustRegister(RequestDuration)
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})
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return nil
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}
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var metricsOnce sync.Once
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