f9bdd382dd
* - ensure plugins that use prometheus.MustRegister, re-register after reload - removing once.Do on the startup function was simplest way to do it. * - fix underscored names (advice of bot) * - tune existing UT for reload, and add a test verifying failing reload does not prevent correct registering for metrics * - ensure different ports for tests that can run in same time ..
105 lines
1.9 KiB
Go
105 lines
1.9 KiB
Go
package health
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import (
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"fmt"
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"net"
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"time"
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"github.com/coredns/coredns/core/dnsserver"
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"github.com/coredns/coredns/plugin"
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"github.com/coredns/coredns/plugin/metrics"
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"github.com/mholt/caddy"
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)
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func init() {
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caddy.RegisterPlugin("health", 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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addr, lame, err := healthParse(c)
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if err != nil {
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return plugin.Error("health", err)
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}
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h := newHealth(addr)
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h.lameduck = lame
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c.OnStartup(func() error {
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plugins := dnsserver.GetConfig(c).Handlers()
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for _, p := range plugins {
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if x, ok := p.(Healther); ok {
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h.h = append(h.h, x)
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}
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}
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return nil
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})
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c.OnStartup(func() error {
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// Poll all middleware every second.
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h.poll()
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go func() {
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for {
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select {
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case <-time.After(1 * time.Second):
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h.poll()
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case <-h.pollstop:
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return
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}
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}
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}()
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return nil
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})
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c.OnStartup(func() error {
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metrics.MustRegister(c, HealthDuration)
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return nil
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})
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c.OnStartup(h.OnStartup)
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c.OnRestart(h.OnRestart)
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c.OnFinalShutdown(h.OnFinalShutdown)
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// Don't do AddPlugin, as health is not *really* a plugin just a separate webserver running.
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return nil
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}
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func healthParse(c *caddy.Controller) (string, time.Duration, error) {
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addr := ""
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dur := time.Duration(0)
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for c.Next() {
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args := c.RemainingArgs()
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switch len(args) {
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case 0:
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case 1:
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addr = args[0]
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if _, _, e := net.SplitHostPort(addr); e != nil {
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return "", 0, e
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}
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default:
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return "", 0, c.ArgErr()
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}
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for c.NextBlock() {
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switch c.Val() {
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case "lameduck":
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args := c.RemainingArgs()
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if len(args) != 1 {
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return "", 0, c.ArgErr()
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}
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l, err := time.ParseDuration(args[0])
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if err != nil {
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return "", 0, fmt.Errorf("unable to parse lameduck duration value: '%v' : %v", args[0], err)
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}
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dur = l
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default:
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return "", 0, c.ArgErr()
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}
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}
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}
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return addr, dur, nil
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}
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