Resync with original git repository

Change-Id: I43e584845753f05b8f7754a2901d98a3687c44c8

.gitignore

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+.stestr
+.tox

.stestr.conf

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+[DEFAULT]
+test_path=./unit_tests
+top_path=./

.zuul.yaml

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+- project:
+    templates:
+      - python-charm-interface-jobs

LICENSE

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README.md

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+# Overview
+
+Use this interface to expose public API endpoint of Designate service.
+
+# Usage
+
+## metadata
+
+To consume this interface in your charm or layer, add the following to `layer.yaml`:
+
+```yaml
+includes: ['interface:designate']
+```
+
+and the following to `metadata.yaml`:
+
+```yaml
+requires:
+  external-dns:
+    interface: designate
+```
+
+## handler example
+
+```python
+@reactive.when('external-dns.available')
+def expose_endpoint(endpoint):
+    with provide_charm_instance() as instance:
+        endpoint.expose_endpoint(instance.public_url)
+```
+
+## deployment example
+
+```python
+$ juju deploy designate
+$ juju deploy neutron-api
+$ juju add-relation designate:external-dns neutron-api:external-dns
+```
+
+# Bugs
+
+Please report bugs on [Launchpad](https://bugs.launchpad.net/openstack-charms/+filebug).
+
+For development questions please refer to the OpenStack [Charm Guide](https://github.com/openstack/charm-guide).

copyright

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+Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0
+
+Files: *
+Copyright: 2015, Canonical Ltd.
+License: Apache-2.0
+
+License: Apache-2.0
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+ .
+    http://www.apache.org/licenses/LICENSE-2.0
+ .
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ .
+ On Debian-based systems the full text of the Apache version 2.0 license
+ can be found in `/usr/share/common-licenses/Apache-2.0'.

interface.yaml

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+name: designate
+summary: Interface for exposing public API endpoint of Designate service
+maintainer: OpenStack Charmers <openstack-dev@lists.openstack.org>

provides.py

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+#!/usr/bin/python
+#
+# Copyright 2017 Canonical Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from charms.reactive import hook
+from charms.reactive import RelationBase
+from charms.reactive import scopes
+
+
+class DesignateProvides(RelationBase):
+    scope = scopes.GLOBAL
+
+    @hook('{provides:designate}-relation-{joined,changed}')
+    def changed(self):
+        self.set_state('{relation_name}.connected')
+
+    @hook('{provides:designate}-relation-{departed,broken}')
+    def departed(self):
+        self.remove_state('{relation_name}.connected')
+
+    def expose_endpoint(self, endpoint):
+        self.set_remote('endpoint', endpoint)

test-requirements.txt

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+flake8>=2.2.4,<=2.4.1
+os-testr>=0.4.1

tox.ini

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+[tox]
+envlist = pep8,py27
+skipsdist = True
+
+[testenv]
+setenv = VIRTUAL_ENV={envdir}
+         PYTHONHASHSEED=0
+install_command =
+  pip install {opts} {packages}
+commands = ostestr {posargs}
+
+[testenv:py27]
+basepython = python2.7
+deps = -r{toxinidir}/test-requirements.txt
+# TODO: Need to write unit tests then remove the following command.
+commands = /bin/true
+
+[testenv:py35]
+basepython = python3.5
+deps = -r{toxinidir}/test-requirements.txt
+# TODO: Need to write unit tests then remove the following command.
+commands = /bin/true
+
+[testenv:py36]
+basepython = python3.6
+deps = -r{toxinidir}/test-requirements.txt
+# TODO: Need to write unit tests then remove the following command.
+commands = /bin/true
+
+[testenv:pep8]
+basepython = python3
+deps = -r{toxinidir}/test-requirements.txt
+commands = flake8 {posargs}
+
+[testenv:venv]
+basepython = python3
+commands = {posargs}
+
+[flake8]
+ignore = E402,E226