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setup.go
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setup.go
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package dnslogging
import (
"github.com/caddyserver/caddy"
"github.com/caddyserver/caddy/caddyfile"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
)
// PluginName is the name of our plugin
const PluginName string = "dnslogging"
func init() {
caddy.RegisterPlugin(PluginName, caddy.Plugin{
ServerType: "dns",
Action: setup,
})
}
func setup(c *caddy.Controller) error {
// Normal Setup
dnslogging, err := parseDNSLogging(c)
if err != nil {
return plugin.Error(PluginName, err)
}
err = dnslogging.Initialize()
if err != nil {
return err
}
// Pass dnslogging plugin to our context
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
dnslogging.Next = next
return dnslogging
})
// Setup startup and shutdown behaviour
c.OnShutdown(func() error {
dnslogging.Close()
return nil
})
return nil
}
func parseDNSLogging(c *caddy.Controller) (*DNSLogging, error) {
var (
dl *DNSLogging
err error
i int
)
for c.Next() {
if i > 0 {
return nil, plugin.ErrOnce
}
i++
dl, err = parseDNSLoggingStanza(&c.Dispenser)
if err != nil {
return nil, err
}
}
return dl, nil
}
func parseDNSLoggingStanza(c *caddyfile.Dispenser) (dl *DNSLogging, err error) {
dl, err = New()
// xpf stanza if present
for c.NextBlock() {
if err := parseDNSLoggingBlock(c, dl); err != nil {
return dl, err
}
}
return dl, err
}
func parseDNSLoggingBlock(c *caddyfile.Dispenser, dl *DNSLogging) error {
switch c.Val() {
case "nats_url":
if arg := c.NextArg(); !arg {
return c.Errf("missing nats_url argument")
}
dl.natsURL = c.Val()
case "kafka_brokers":
if arg := c.NextArg(); !arg {
return c.Errf("missing kafka_brokers arguments")
}
dl.kafkaBrokers = c.RemainingArgs()
// TODO: Validate the brokers that are passed in
case "kafka_topic":
if arg := c.NextArg(); !arg {
return c.Errf("missing kafka_topic argument")
}
dl.kafkaTopic = c.Val()
default:
return c.Errf("unknown property '%s'", c.Val())
}
return nil
}