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db0b16b615
Add a ready plugin that allows plugin to signal when they are ready.
Once a plugin is ready it is not queried again.
This uses same mechanism as the health plugin: each plugin needs to
implement an interface.
Implement readines for the *erratic* plugin to aid in testing.
Add README.md and tests moduled after the health plugin; which will be
relegated to just providing process health. In similar vein to health
this is a process wide setting.
With this Corefile:
~~~
. {
erratic
whoami
ready
}
bla {
erratic
whoami
}
~~~
ready will lead to:
~~~ sh
% curl localhost:8181/ready
% dig @localhost -p 1053 mx example.org
% curl localhost:8181/ready
OK%
~~~
Meanwhile CoreDNS logs:
~~~
.:1053
bla.:1053
2019-02-26T20:59:07.137Z [INFO] CoreDNS-1.3.1
2019-02-26T20:59:07.137Z [INFO] linux/amd64, go1.11.4,
CoreDNS-1.3.1
linux/amd64, go1.11.4,
2019-02-26T20:59:11.415Z [INFO] plugin/ready: Still waiting on: "erratic"
2019-02-26T20:59:13.510Z [INFO] plugin/ready: Still waiting on: "erratic"
~~~
*ready* can be used in multiple server blocks and will do the right
thing; query all those plugins from all server blocks for readiness.
This does a similar thing to the prometheus plugin.
Signed-off-by: Miek Gieben <miek@miek.nl>
51 lines
774 B
Go
51 lines
774 B
Go
// generated by directives_generate.go; DO NOT EDIT
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package dnsserver
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// Directives are registered in the order they should be
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// executed.
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//
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// Ordering is VERY important. Every plugin will
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// feel the effects of all other plugin below
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// (after) them during a request, but they must not
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// care what plugin above them are doing.
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var Directives = []string{
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"metadata",
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"tls",
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"reload",
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"nsid",
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"root",
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"bind",
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"debug",
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"trace",
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"ready",
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"health",
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"pprof",
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"prometheus",
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"errors",
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"log",
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"dnstap",
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"chaos",
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"loadbalance",
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"cache",
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"rewrite",
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"dnssec",
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"autopath",
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"template",
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"hosts",
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"route53",
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"federation",
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"k8s_external",
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"kubernetes",
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"file",
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"auto",
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"secondary",
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"etcd",
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"loop",
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"forward",
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"proxy",
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"erratic",
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"whoami",
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"on",
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}
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