ea77f2a2ca
* core: replace GetMiddleware See the discussion in #881. GetMiddleware would add a `nil` middleware to the callstack thereby breaking functionality. This PR drops it in favor of RegisterHandler which is a completely standalone registry for middleware that want to let it self know to other middleware. Currenly *autopath* uses this to call *kubernetes*'s AutoPath method for dynamic autopathing. * Drop GetMiddleware * Register metrics * drop the panic
45 lines
902 B
Go
45 lines
902 B
Go
package proxy
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import (
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"github.com/coredns/coredns/core/dnsserver"
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"github.com/coredns/coredns/middleware"
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"github.com/mholt/caddy"
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)
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func init() {
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caddy.RegisterPlugin("proxy", caddy.Plugin{
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ServerType: "dns",
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Action: setup,
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})
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}
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func setup(c *caddy.Controller) error {
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upstreams, err := NewStaticUpstreams(&c.Dispenser)
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if err != nil {
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return middleware.Error("proxy", err)
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}
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t := dnsserver.GetConfig(c).GetHandler("trace")
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P := &Proxy{Trace: t}
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dnsserver.GetConfig(c).AddMiddleware(func(next middleware.Handler) middleware.Handler {
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P.Next = next
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P.Upstreams = &upstreams
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return P
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})
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c.OnStartup(OnStartupMetrics)
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for _, u := range upstreams {
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c.OnStartup(func() error {
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return u.Exchanger().OnStartup(P)
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})
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c.OnShutdown(func() error {
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return u.Exchanger().OnShutdown(P)
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})
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// Register shutdown handlers.
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c.OnShutdown(u.Stop)
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}
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return nil
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}
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