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package proxy
import (
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/plugin/metrics"
"github.com/mholt/caddy"
)
func init() {
caddy.RegisterPlugin("proxy", caddy.Plugin{
ServerType: "dns",
Action: setup,
})
}
func setup(c *caddy.Controller) error {
upstreams, err := NewStaticUpstreams(&c.Dispenser)
if err != nil {
return plugin.Error("proxy", err)
}
t := dnsserver.GetConfig(c).Handler("trace")
P := &Proxy{Trace: t}
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
P.Next = next
P.Upstreams = &upstreams
return P
})
c.OnStartup(func() error {
once.Do(func() {
m := dnsserver.GetConfig(c).Handler("prometheus")
if m == nil {
return
}
if x, ok := m.(*metrics.Metrics); ok {
x.MustRegister(RequestCount)
x.MustRegister(RequestDuration)
}
})
return nil
})
for i := range upstreams {
u := upstreams[i]
c.OnStartup(func() error {
return u.Exchanger().OnStartup(P)
})
c.OnShutdown(func() error {
return u.Exchanger().OnShutdown(P)
})
// Register shutdown handlers.
c.OnShutdown(u.Stop)
}
return nil
}
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