* mw/file: wildcard at apex fix

This adds a test case (that does passes!)

* completer test

* hosts middleware should return NoError if other records exist in the zone

* return RcodeSuccess for hosts queries for non A,AAAA records if the zone exists

* return NXDOMAIN instead of REFUSED when zone is not found

* fix aaaa response

* unit tests

* Add unit tests & cnames

* more progress

* fix

* next mw dependent unit tests

* add tests for OnNXDOMAIN

* Add AAAA and ndots unit tests; fix request.NewWithQuestion

* Correct default value in README

* add CNAMEs to readme

* review

* fix autopath examples

* fix and test CNAME response order

* add wildcard parameter to allow resolving multiple name to the same IP

* first test for the reverse wildcard middleware

* update wildcard keyword test to pass code coverage

* rewrite readme

* remove breaks

* missed a break

* nits

* show options as optional
* add note to pods insecure
* add minimal configuration example.
* add a note about replacing kube-dns in the summary
* move deployment section into summary.

* Update README.md

* replace options sections with bullets

and indent all sub sections to match bullet indentation.
not sure if this will render in github properly - it doesn't in the in-line editor preview.

* fix indentation

Contrary to various on-line guides and editors, github now requires 2 spaces to indent paragraphs with bulleted sections above (not just 1).

* Update README.md

* Update README.md

* Update README.md

* fix label syntax

It's just a single EXPRESSION.  The EXPRESSION itself has its own kubernetes label expression format.

* Update README.md

* Update README.md

* Switches out Unhealthy bool for OkUntil timestamp

* Make sure servers are healthy forever if there are no health checks

* Moves health check off into a go routine to avoid blocking conditions

* Improved logging info

* Fixes initial date

* Fixes health checking; alters tests to adapt to async health checking

* Moves future variable into static upstream and populates it in more places

* Restores silencing of stdout during testing

* Restores silencing of stdout during testing

* keeps check url string once built

* Removes debug message

* uses zero value to signal no checking; reduces in-mutex code to a fetch

* initial commit

* add config options

* add readme

* rewording

* revert unlreated change

* normalize host domain path

* add ndots opt, allow > 1 host domains, pull host domains from resolv.conf

* implementing review feedback

* update readme

* use dns lib, config format, defaults

* Correct autopath example.

This fix disables codecov/patch and codecov/changes status
report as the project has already been well covered by
codecov/project status. The codecov/patch and codecov/changes status
are misleading.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

While adding a parallel performance benchmark I stumbled on a race
condition (another reason to add performance benchmarks!), so this
PR makes sure the msg is created in a race free manor and adds the
parallel benchmark.

* change IPv4 separator from - to .

* fix reverse middleware tests and README to adapt with . instead of -

This fix adjusted codecov config (codecov.yml) so that
commit status is success as long as coverage > 40%.

This fix fixes #752.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

Fix transferring the zone from a master and the matching of notifies
to source and dst IP addresses.

Add `upstream` keyword as well, because it is needed for the same
reasons as in the *file* middlware.
Add some dire warning about upstream in the readme of both middlewares.

Out of band testing, hidden by net build tag was added. Integration
testing still needs to be setup.

We would silently ignore anything that we couldn't parse on the command
line, this change make this an error.

Fixes #743

Cant' transfer zone from masters without populating `f`.
This error prevents secondary zones recognized as "true" secondary, so secondary setting never worked.

In grafana we miss the context of where this is called, make the name
more descriptive.

Also test the GH webhook.

* update dockerfile to allow use of https_google

to use TLS in a docker container (based on Alpine linux) you need to also include the CA certificate files

* cleaned up version of Dockerfile that supports https_google

* cleanup: go vet and golint run

Various cleanups trickered by go vet and golint.

* Fix tests and lowercase all errors

Lowercase all errors, some tests in kubernetes use errors from
kubernetes which do start with a capital letter.

* federation initial commit

* UTs/bugfixes

* federation bits

* polish, cover UT gaps

* add TODO

* go fmt & todo note

* remove unrelated change

* pr changes

* start node watcher

* get real node name

* remove unused case

* middleware/debug: add

Add a debug "middleware" that disables the recover() and just lets
CoreDNS crash; very useful for testing.

Fixes ##563

* fix test

* Feedback: check the value of Debug

Don't load a zone with a SOA record, barf with 'no SOA record' error.

* cache: add sharded cache implementation

Add Cache impl and a few tests. This cache is 256-way sharded, mainly
so each shard has it's own lock. The main cache structure is a readonly
jump plane into the right shard.

This should remove the single lock contention on the main lock and
provide more concurrent throughput - Obviously this hasn't been tested
or measured.

The key into the cache was made a uint32 (hash.fnv) and the hashing op
is not using strings.ToLower anymore remove any GC in that code path.

* here too

* Minimum shard size

* typos

* blurp

* small cleanups no defer

* typo

* Add freq based on Johns idea

* cherry-pick conflict resolv

* typo

* update from early code review from john

* add prefetch to the cache

* mw/cache: add prefetch

* remove println

* remove comment

* Fix tests

* Test prefetch in setup

* Add start of cache

* try add diff cache options

* Add hacky testcase

* not needed

* allow the use of a percentage for prefetch

If the TTL falls below xx% do a prefetch, if the record was popular.
Some other fixes and correctly prefetch only popular records.

A somewhat longer living PR to group documentation updates

It's not used, remove it.

* core: -log bolean flag to enable logging

Change to -log flag to a boolean that defaults false and when true
logs to stdout.

* And bool here

* add hosts middleware

* forgot pointer receiver

* add appropriately modified hostsfile tests from golang repo

* remove test artifacts, separate hostsfile parsing from caching and opening, remove unused metrics references, move middleware up the chain

* refactored the logic for creating records and filtering ip address versions. also got PTR lookups working

* Add README.md. Modify config to be more concise. Add zones list to config. Filter PTR responses based on zones list.

* add Fallthrough and return correct dns response code otherwise

* Simplified Hostsfile to only store hosts in the zones we care about, and by ip version. Added handler tests and improved other tests.

* oops, goimports loaded a package from a different repo