forked from coredns/coredns
/
setup.go
73 lines (61 loc) · 1.19 KB
/
setup.go
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package health
import (
"net"
"time"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
"github.com/mholt/caddy"
)
func init() {
caddy.RegisterPlugin("health", caddy.Plugin{
ServerType: "dns",
Action: setup,
})
}
func setup(c *caddy.Controller) error {
addr, err := healthParse(c)
if err != nil {
return plugin.Error("health", err)
}
h := &health{Addr: addr}
c.OnStartup(func() error {
for he := range healthers {
m := dnsserver.GetConfig(c).Handler(he)
if x, ok := m.(Healther); ok {
h.h = append(h.h, x)
}
}
return nil
})
c.OnStartup(func() error {
h.poll()
go func() {
for {
<-time.After(1 * time.Second)
h.poll()
}
}()
return nil
})
c.OnStartup(h.Startup)
c.OnFinalShutdown(h.Shutdown)
// Don't do AddPlugin, as health is not *really* a plugin just a separate webserver running.
return nil
}
func healthParse(c *caddy.Controller) (string, error) {
addr := ""
for c.Next() {
args := c.RemainingArgs()
switch len(args) {
case 0:
case 1:
addr = args[0]
if _, _, e := net.SplitHostPort(addr); e != nil {
return "", e
}
default:
return "", c.ArgErr()
}
}
return addr, nil
}