mirror of
https://github.com/coredns/coredns.git
synced 2025-10-27 08:14:18 -04:00
004c5fca9d
Abstract the caddy call and make it simpler. See #3261 for some part of the discussion. Go from: ~~~ go func init() { caddy.RegisterPlugin("any", caddy.Plugin{ ServerType: "dns", Action: setup, }) } ~~~ To: ~~~ go func init() { plugin.Register("any", setup) } ~~~ This requires some external documents in coredns.io to be updated as well; the old way still works, so it's backwards compatible. Signed-off-by: Miek Gieben <miek@miek.nl>
106 lines
2.5 KiB
Go
106 lines
2.5 KiB
Go
package metrics
|
|
|
|
import (
|
|
"net"
|
|
"runtime"
|
|
|
|
"github.com/coredns/coredns/core/dnsserver"
|
|
"github.com/coredns/coredns/coremain"
|
|
"github.com/coredns/coredns/plugin"
|
|
"github.com/coredns/coredns/plugin/metrics/vars"
|
|
clog "github.com/coredns/coredns/plugin/pkg/log"
|
|
"github.com/coredns/coredns/plugin/pkg/uniq"
|
|
|
|
"github.com/caddyserver/caddy"
|
|
)
|
|
|
|
var (
|
|
log = clog.NewWithPlugin("prometheus")
|
|
u = uniq.New()
|
|
registry = newReg()
|
|
)
|
|
|
|
func init() { plugin.Register("prometheus", setup) }
|
|
|
|
func setup(c *caddy.Controller) error {
|
|
m, err := parse(c)
|
|
if err != nil {
|
|
return plugin.Error("prometheus", err)
|
|
}
|
|
m.Reg = registry.getOrSet(m.Addr, m.Reg)
|
|
|
|
c.OnStartup(func() error { m.Reg = registry.getOrSet(m.Addr, m.Reg); u.Set(m.Addr, m.OnStartup); return nil })
|
|
c.OnRestartFailed(func() error { m.Reg = registry.getOrSet(m.Addr, m.Reg); u.Set(m.Addr, m.OnStartup); return nil })
|
|
|
|
c.OnStartup(func() error { return u.ForEach() })
|
|
c.OnRestartFailed(func() error { return u.ForEach() })
|
|
|
|
c.OnStartup(func() error {
|
|
conf := dnsserver.GetConfig(c)
|
|
for _, h := range conf.ListenHosts {
|
|
addrstr := conf.Transport + "://" + net.JoinHostPort(h, conf.Port)
|
|
for _, p := range conf.Handlers() {
|
|
vars.PluginEnabled.WithLabelValues(addrstr, conf.Zone, p.Name()).Set(1)
|
|
}
|
|
}
|
|
return nil
|
|
})
|
|
c.OnRestartFailed(func() error {
|
|
conf := dnsserver.GetConfig(c)
|
|
for _, h := range conf.ListenHosts {
|
|
addrstr := conf.Transport + "://" + net.JoinHostPort(h, conf.Port)
|
|
for _, p := range conf.Handlers() {
|
|
vars.PluginEnabled.WithLabelValues(addrstr, conf.Zone, p.Name()).Set(1)
|
|
}
|
|
}
|
|
return nil
|
|
})
|
|
|
|
c.OnRestart(m.OnRestart)
|
|
c.OnRestart(func() error { vars.PluginEnabled.Reset(); return nil })
|
|
c.OnFinalShutdown(m.OnFinalShutdown)
|
|
|
|
// Initialize metrics.
|
|
buildInfo.WithLabelValues(coremain.CoreVersion, coremain.GitCommit, runtime.Version()).Set(1)
|
|
|
|
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
|
|
m.Next = next
|
|
return m
|
|
})
|
|
|
|
return nil
|
|
}
|
|
|
|
func parse(c *caddy.Controller) (*Metrics, error) {
|
|
met := New(defaultAddr)
|
|
|
|
i := 0
|
|
for c.Next() {
|
|
if i > 0 {
|
|
return nil, plugin.ErrOnce
|
|
}
|
|
i++
|
|
|
|
for _, z := range c.ServerBlockKeys {
|
|
met.AddZone(plugin.Host(z).Normalize())
|
|
}
|
|
args := c.RemainingArgs()
|
|
|
|
switch len(args) {
|
|
case 0:
|
|
case 1:
|
|
met.Addr = args[0]
|
|
_, _, e := net.SplitHostPort(met.Addr)
|
|
if e != nil {
|
|
return met, e
|
|
}
|
|
default:
|
|
return met, c.ArgErr()
|
|
}
|
|
}
|
|
return met, nil
|
|
}
|
|
|
|
// defaultAddr is the address the where the metrics are exported by default.
|
|
const defaultAddr = "localhost:9153"
|