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middleware/proxy: implement Exchanger (#480)

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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
This commit is contained in:
Miek Gieben 2017-01-15 08:12:58 +00:00 • committed by GitHub
parent a6d232a622
commit 52e01264e8
25 changed files with 140 additions and 61 deletions
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8
middleware/proxy/metrics.go
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@ -12,14 +12,14 @@ import (
var (
RequestDuration = prometheus.NewHistogramVec(prometheus.HistogramOpts{
Namespace: middleware.Namespace,
Subsystem: subsystem,
Subsystem: "proxy",
Name: "request_duration_milliseconds",
Buckets: append(prometheus.DefBuckets, []float64{50, 100, 200, 500, 1000, 2000, 3000, 4000, 5000, 10000}...),
Help: "Histogram of the time (in milliseconds) each request took.",
}, []string{"zone"})
}, []string{"protocol", "zone"})
)
// OnStartup sets up the metrics on startup.
// OnStartup sets up the metrics on startup. This is done for all proxy protocols.
func OnStartup() error {
metricsOnce.Do(func() {
prometheus.MustRegister(RequestDuration)
@ -28,5 +28,3 @@ func OnStartup() error {
}
var metricsOnce sync.Once
const subsystem = "proxy"