05204ef142
* - UT on metrics verifying that all plugins of all blocs have their metrics collectors declared * - fix error msg * - redirect Registry of metric to the one that handle the listener - allow duplicate of metrics collector on the same Registry (case of same plugin in 2 blocs listening metrics on the same address) * - fix change of signature * - ensure cleaning metrics before starting the test (metrics collectors are global vars .. and re-used by several tests) * - I think I fixed this test. Ensure correct mn of hits and clean metrics before test. * - fix typo in error msg - proposed at review * - fix typo in comment * - remove ResetMetrics functions - change a way to test the numeric metrics : get the diff between begin and end of test * - oops. removing debug logs
93 lines
1.8 KiB
Go
93 lines
1.8 KiB
Go
package metrics
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import (
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"net"
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"runtime"
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"github.com/coredns/coredns/core/dnsserver"
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"github.com/coredns/coredns/coremain"
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"github.com/coredns/coredns/plugin"
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clog "github.com/coredns/coredns/plugin/pkg/log"
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"github.com/coredns/coredns/plugin/pkg/uniq"
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"github.com/mholt/caddy"
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)
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var (
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log = clog.NewWithPlugin("prometheus")
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uniqAddr = uniq.New()
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)
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func init() {
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caddy.RegisterPlugin("prometheus", 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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m, err := prometheusParse(c)
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if err != nil {
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return plugin.Error("prometheus", err)
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}
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// register the metrics to its address (ensure only one active metrics per address)
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obj := uniqAddr.Set(m.Addr, m.OnStartup, m)
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//propagate the real active Registry to current metrics
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if om, ok := obj.(*Metrics); ok {
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m.Reg = om.Reg
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}
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dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
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m.Next = next
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return m
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})
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c.OncePerServerBlock(func() error {
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c.OnStartup(func() error {
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return uniqAddr.ForEach()
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})
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return nil
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})
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c.OnRestart(m.OnRestart)
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c.OnFinalShutdown(m.OnFinalShutdown)
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// Initialize metrics.
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buildInfo.WithLabelValues(coremain.CoreVersion, coremain.GitCommit, runtime.Version()).Set(1)
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return nil
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}
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func prometheusParse(c *caddy.Controller) (*Metrics, error) {
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var met = New(defaultAddr)
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i := 0
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for c.Next() {
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if i > 0 {
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return nil, plugin.ErrOnce
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}
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i++
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for _, z := range c.ServerBlockKeys {
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met.AddZone(plugin.Host(z).Normalize())
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}
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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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met.Addr = args[0]
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_, _, e := net.SplitHostPort(met.Addr)
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if e != nil {
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return met, e
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}
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default:
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return met, c.ArgErr()
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}
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}
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return met, nil
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}
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// defaultAddr is the address the where the metrics are exported by default.
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const defaultAddr = "localhost:9153"
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