* plugin/chaos: add default list of authors

Add a owners_generate.go that generates a Owners variables for use in
the chaos plugin.

Add a default list of authors in the authors.bind CH zone. When doing a
query this now returns:

~~~ sh
% dig authors.bind TXT CH

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5456
;; flags: qr rd; QUERY: 1, ANSWER: 22, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;authors.bind.			CH	TXT

;; ANSWER SECTION:
authors.bind.		0	CH	TXT	"bradbeam"
authors.bind.		0	CH	TXT	"chrisohaver"
authors.bind.		0	CH	TXT	"dilyevsky"
authors.bind.		0	CH	TXT	"ekleiner"
authors.bind.		0	CH	TXT	"fastest963"
authors.bind.		0	CH	TXT	"fturib"
authors.bind.		0	CH	TXT	"greenpau"
authors.bind.		0	CH	TXT	"grobie"
authors.bind.		0	CH	TXT	"inigohu"
authors.bind.		0	CH	TXT	"isolus"
authors.bind.		0	CH	TXT	"johnbelamaric"
authors.bind.		0	CH	TXT	"miekg"
authors.bind.		0	CH	TXT	"nchrisdk"
authors.bind.		0	CH	TXT	"nitisht"
authors.bind.		0	CH	TXT	"pmoroney"
authors.bind.		0	CH	TXT	"rajansandeep"
authors.bind.		0	CH	TXT	"rdrozhdzh"
authors.bind.		0	CH	TXT	"rtreffer"
authors.bind.		0	CH	TXT	"stp-ip"
authors.bind.		0	CH	TXT	"superq"
authors.bind.		0	CH	TXT	"varyoo"
authors.bind.		0	CH	TXT	"yongtang"
~~~

This was hard to do previously as we didn't hardcode this in the source,
but now with OWNERS files we can just generate this list.

Privacy wise this isn't worse than being listed in OWNERS file in the
first place. And it's a nice hat tip to the people making CoreDNS
better.
Signed-off-by: Miek Gieben <miek@miek.nl>

* Sticklet bot comments
Signed-off-by: Miek Gieben <miek@miek.nl>

* [plugin/route53]: Do not return NXDOMAIN where it should be NODATA.
Signed-off-by: Dmitry Ilyevskiy <dmitry.ilyevskiy@getcruise.com>

* Fix bad merge.
Signed-off-by: Dmitry Ilyevskiy <dmitry.ilyevskiy@getcruise.com>

Rename connTimeout to graceTimeout to be more instructive on it's use,
some whitespace for imports lines.
Signed-off-by: Miek Gieben <miek@miek.nl>

A 'make -f Makefile.doc clean all'.
Signed-off-by: Miek Gieben <miek@miek.nl>

I can't find what's this code should be doing and it looks like it's
not doing anything.
Signed-off-by: Miek Gieben <miek@miek.nl>

* plugin/cancel: add context cancelation plugin

Per review comments on #2704, move this into a plugin that gets called.
Add the most minimal plugin, tests and documenation.
Signed-off-by: Miek Gieben <miek@miek.nl>

* plugin/cache: add timeout option

review feedback: add option to set custom timeout.
Signed-off-by: Miek Gieben <miek@miek.nl>

* spelling
Signed-off-by: Miek Gieben <miek@miek.nl>

Rework this a little to be more inline with the other READMEs
Signed-off-by: Miek Gieben <miek@miek.nl>

* - add an option for block profiling to plugin pprof

* - move option block into nested block

* Remove context.Context from request.Request

This removes the context from request.Request and makes all the changes
in the code to make it compile again. It's all mechanical. It did
unearth some weirdness in that the context was kept in handler structs
which may cause havoc with concurrently handling of requests.

Fixes #2721
Signed-off-by: Miek Gieben <miek@miek.nl>

* Make test compile
Signed-off-by: Miek Gieben <miek@miek.nl>

Add another test case for impossible DNS messages which should not be
cached. This adds a check for a message that denies its own existence.

Fixes #2724.
Signed-off-by: Miek Gieben <miek@miek.nl>

* Don't double report metrics on error

When there is an error use a different function to report the metrics,
in case the plugin chain handled the request the metrics are already
reported.

Fixes: #2717
Signed-off-by: Miek Gieben <miek@miek.nl>

* Compile again
Signed-off-by: Miek Gieben <miek@miek.nl>

* more
Signed-off-by: Miek Gieben <miek@miek.nl>

* Remove server addr from the context

This was added twice, just leave the server which also holds the
address.

Conflicts with #2719 but should be easy to fix.
Signed-off-by: Miek Gieben <miek@miek.nl>

* doesn't need server context
Signed-off-by: Miek Gieben <miek@miek.nl>

The server handles this case no need to also do it in the log plugin.

Means DefaultErrorFunc can be private to the dnsserver and is now
renamed to just errorFunc

Fixes: #2715
Signed-off-by: Miek Gieben <miek@miek.nl>

ErrorMessage was a very shallow function that didn't add anything.
Remove it and remove its usage.
Signed-off-by: Miek Gieben <miek@miek.nl>

*grpc* was added manually; do a go generate to add it, so we don't have
future diffs.
Signed-off-by: Miek Gieben <miek@miek.nl>

* Add a GaugeVec for enabled plugins monitoring.
Signed-off-by: Jiacheng Xu <xjcmaxwellcjx@gmail.com>

* Add server label and zone label for enable_plugin matric.

* Add a test for PluginEnabled metric

* Add description for enabledPlugin metric.

* Change the description for the enabledPlugin metric.

* Reset the enabledPlugin metric when restart the server.

* Add the bug session for enabledPlugin metric.

* Remove the resolveTCPAddr

* plugin/kubernetes: add ready function

Add ready function as the health function is now gone.
Signed-off-by: Miek Gieben <miek@miek.nl>

* Fix readme
Signed-off-by: Miek Gieben <miek@miek.nl>

Just fixing some missing `)`

* patch setup

Use a more streamlined grammar

* fix break

No need to break out in this for loop

Fix setup parser. Config params are not being setting.

* plugin/grpc: New gRPC plugin

* some changes after the first review:

- remove healthcheck. gRPC already has this implicitly implemented
- some naming and stetic changes
- fix some comments
- other minor fixes

* plugin/grpc: New gRPC plugin

* some changes after the first review:

- remove healthcheck. gRPC already has this implicitly implemented
- some naming and stetic changes
- fix some comments
- other minor fixes

* add OWNERS file and change plugin order

* remove Rcode checker

* [plugin/route53] Support wildcards and other escaped chars.

* Fix multiple issues. Add tests.

* Cleanup some comments.

to fix issue #2689
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Remove etcd unit testing from travis

Remove these from the travis unit testing. (to speed up travis)

See #2671
Signed-off-by: Miek Gieben <miek@miek.nl>

* Add build tag
Signed-off-by: Miek Gieben <miek@miek.nl>

in order to speed up the go mod
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

Add a simpler example that returns a static string the for metadata.
Signed-off-by: Miek Gieben <miek@miek.nl>

Point proxy to the fake deprecated plugin, next release that will be
removed as well.
Signed-off-by: Miek Gieben <miek@miek.nl>

cleanup modules support, fix DataDog/dd-trace-go probem, add go.mod tidyness check.

This now lives on coredns/proxy
Signed-off-by: Miek Gieben <miek@miek.nl>

* Take 3: to get coredns/proxy pulled in

This is need temporary because it will point to the fake 'deprecated'
plugin anyway.
Signed-off-by: Miek Gieben <miek@miek.nl>

* update proxy again
Signed-off-by: Miek Gieben <miek@miek.nl>

Use gopkg.in/DataDog/dd-trace-go.v0 as this is the new home for it

Fixes: #2282
Signed-off-by: Miek Gieben <miek@miek.nl>

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

Some more udp/tcp fixes/cleanups have been merged. Run through our gamut
of tests.
Signed-off-by: Miek Gieben <miek@miek.nl>

This version reverts the worker model that's causes cpu overloads.
Signed-off-by: Miek Gieben <miek@miek.nl>

* plugin/health: remove ability to poll other plugins

This mechanism defeats the purpose any plugin (mostly) caching can still
be alive, we can probably forward queries still. Don't poll plugins,
just tell the world we're up and running.

It was only actually used in kubernetes; and there specifically would
mean any network hiccup would NACK the entire server health.

Fixes: #2534
Signed-off-by: Miek Gieben <miek@miek.nl>

* update docs based on feedback
Signed-off-by: Miek Gieben <miek@miek.nl>