MySQL InnoDB Cluster Interface

* peers handles cluster communication

.gitignore

@@ -0,0 +1,4 @@
+.tox
+.testrepository
+.stestr/
+__pycache__

.stestr.conf

@@ -0,0 +1,3 @@
+[DEFAULT]
+test_path=./unit_tests
+top_dir=./

.travis.yml

@@ -0,0 +1,9 @@
+language: python
+python:
+  - "3.6"
+install: pip install tox-travis
+env:
+  - ENV=pep8
+  - ENV=py3
+script:
+  - tox -e $ENV

LICENSE

@@ -0,0 +1,202 @@
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README.md

@@ -0,0 +1,80 @@
+# Overview
+
+This interface layer handles the intra-cluster relations for
+msyql-innodb-cluster.
+
+# Usage
+
+## Peers
+
+The interface layer will set the following state:
+
+  * `{relation_name}.connected`  The cluster relation is established.
+  * `{relation_name}.available`  The cluster relation data is complete.
+  * `{relation_name}.clustered`  All cluster units are clustered.
+
+Cluster relation information can be set on the relation with the following methods:
+
+
+Set the cluster relation information to connect to this unit:
+
+```python
+    def cluster.set_cluster_connection_info(
+        "192.168.1.5", "clusteruser", "passwd")
+```
+
+Indicate this unit's readiness for clustering:
+
+```python
+    cluster.set_unit_configure_ready():
+```
+
+Indicate this unit has been clustered:
+
+```python
+    cluster.set_unit_clustered(self):
+    cluster.set_unit_configure_ready(self):
+```
+
+
+For example:
+
+```python
+
+@reactive.when('cluster.connected')
+@reactive.when_not('cluster.available')
+def send_cluster_connection_info(cluster):
+    with charm.provide_charm_instance() as instance:
+        cluster.set_cluster_connection_info(
+            instance.cluster_address,
+            instance.cluster_user,
+            instance.cluster_password)
+
+
+@reactive.when('cluster.available')
+def create_remote_cluster_user(cluster):
+    with charm.provide_charm_instance() as instance:
+        for unit in cluster.all_joined_units:
+            instance.create_cluster_user(
+                unit.received['cluster-address'],
+                unit.received['cluster-user'],
+                unit.received['cluster-password'])
+
+        cluster.set_unit_configure_ready()
+
+@reactive.when('leadership.set.cluster-created')
+@reactive.when('cluster.available')
+def signal_clustered(cluster):
+    # Optimize clustering by causing a cluster relation changed
+    with charm.provide_charm_instance() as instance:
+        if reactive.is_flag_set(
+                "leadership.set.cluster-instance-clustered-{}"
+                .format(instance.cluster_address)):
+            cluster.set_unit_clustered()
+        instance.assess_status()
+```
+
+The interface will automatically determine the network space binding on the
+local unit to present to the MySQL InnoDB cluster based on the name of the
+relation. This can be overridden using the cluster_host parameter of the
+set_cluster_connection_info method.

interface.yaml

@@ -0,0 +1,12 @@
+name: mysql-innodb-cluster
+summary: A peer interface for MySQL 8 InnoDB clustering
+maintainer: OpenStack Charmers <openstack-charmers@lists.ubuntu.com>
+ignore:
+  - 'unit_tests'
+  - '.stestr.conf'
+  - 'test-requirements.txt'
+  - 'tox.ini'
+  - '.gitignore'
+  - '.travis.yml'
+  - '.zuul.yaml'
+  - '.tox'

peers.py

@@ -0,0 +1,139 @@
+# Copyright 2019 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 import reactive
+import charmhelpers.contrib.network.ip as ch_net_ip
+
+
+class MySQLInnoDBClusterPeer(reactive.Endpoint):
+
+    # MySQL InnoDB Cluster must have at least 3 units for viability
+    minimum_cluster_size = 3
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.ingress_address = ch_net_ip.get_relation_ip(self.endpoint_name)
+
+    def relation_ids(self):
+        return [x.relation_id for x in self.relations]
+
+    def set_ingress_address(self):
+        for relation in self.relations:
+            relation.to_publish_raw["ingress-address"] = self.ingress_address
+            relation.to_publish_raw["private-address"] = self.ingress_address
+
+    @property
+    def peer_relation(self):
+        # Get the first relation object as we only have one relation to peers
+        return self.relations[0]
+
+    def available(self):
+        if len(self.all_joined_units) < (self.minimum_cluster_size - 1):
+            return False
+        for unit in self.all_joined_units:
+            if not unit.received['cluster-address']:
+                return False
+            if not unit.received['cluster-user']:
+                return False
+            if not unit.received['cluster-password']:
+                return False
+        return True
+
+    def clustered(self):
+        if len(self.all_joined_units) < (self.minimum_cluster_size - 1):
+            return False
+        for unit in self.all_joined_units:
+            if not unit.received['unit-clustered']:
+                return False
+        return True
+
+    @reactive.when('endpoint.{endpoint_name}.joined')
+    def joined(self):
+        reactive.set_flag(self.expand_name('{endpoint_name}.connected'))
+        self.set_ingress_address()
+
+    @reactive.when('endpoint.{endpoint_name}.changed')
+    def changed(self):
+        flags = (
+            self.expand_name(
+                'endpoint.{endpoint_name}.changed.cluster-address'),
+            self.expand_name(
+                'endpoint.{endpoint_name}.changed.cluster-user'),
+            self.expand_name(
+                'endpoint.{endpoint_name}.changed.cluster-password'),
+            # Optimizers
+            self.expand_name(
+                'endpoint.{endpoint_name}.changed.unit-configure-ready'),
+            self.expand_name(
+                'endpoint.{endpoint_name}.changed.unit-clustered'),
+        )
+        if reactive.all_flags_set(*flags):
+            for flag in flags:
+                reactive.clear_flag(flag)
+
+        if self.available():
+            reactive.set_flag(self.expand_name('{endpoint_name}.available'))
+        else:
+            reactive.clear_flag(self.expand_name('{endpoint_name}.available'))
+
+        if self.clustered():
+            reactive.set_flag(self.expand_name('{endpoint_name}.clustered'))
+        else:
+            reactive.clear_flag(self.expand_name('{endpoint_name}.clustered'))
+
+    @reactive.when_any('endpoint.{endpoint_name}.broken',
+                       'endpoint.{endpoint_name}.departed')
+    def departed(self):
+        flags = (
+            self.expand_name('{endpoint_name}.connected'),
+            self.expand_name('{endpoint_name}.available'),
+        )
+        for flag in flags:
+            reactive.clear_flag(flag)
+
+    def set_cluster_connection_info(
+            self, cluster_address, cluster_user, cluster_password):
+        """Send cluster connection information to peers.
+
+        :param cluster_address: Cluster IP or hostname
+        :type cluster_address: str
+        :param cluster_user: User for cluster user
+        :type cluster_user: str
+        :param cluster_password: Password for cluster user
+        :type cluster_password: str
+        :side effect: Data is set on the relation
+        :returns: None, this function is called for its side effect
+        :rtype: None
+        """
+        self.peer_relation.to_publish['cluster-address'] = cluster_address
+        self.peer_relation.to_publish['cluster-user'] = cluster_user
+        self.peer_relation.to_publish['cluster-password'] = cluster_password
+
+    def set_unit_configure_ready(self):
+        """Indicate to the cluster peers this unit is ready for configuration.
+
+        :side effect: Data is set on the relation
+        :returns: None, this function is called for its side effect
+        :rtype: None
+        """
+        self.peer_relation.to_publish['unit-configure-ready'] = True
+
+    def set_unit_clustered(self):
+        """Indicate to the cluster peers this unit is clustered.
+
+        :side effect: Data is set on the relation
+        :returns: None, this function is called for its side effect
+        :rtype: None
+        """
+        self.peer_relation.to_publish['unit-clustered'] = True

test-requirements.txt

@@ -0,0 +1,5 @@
+charms.reactive
+flake8>=2.2.4,<=2.4.1
+mock>=1.2
+stestr>=2.2.0
+git+https://github.com/openstack/charms.openstack.git#egg=charms.openstack

tox.ini

@@ -0,0 +1,42 @@
+[tox]
+envlist = pep8,py3
+skipsdist = True
+# NOTE(beisner): Avoid build/test env pollution by not enabling sitepackages.
+sitepackages = False
+# NOTE(beisner): Avoid false positives by not skipping missing interpreters.
+skip_missing_interpreters = False
+
+[testenv]
+setenv = VIRTUAL_ENV={envdir}
+         PYTHONHASHSEED=0
+install_command =
+  pip install {opts} {packages}
+commands = stestr run {posargs}
+passenv = HOME TERM
+deps = -r{toxinidir}/test-requirements.txt
+
+[testenv:py34]
+basepython = python3.4
+
+[testenv:py35]
+basepython = python3.5
+
+[testenv:py36]
+basepython = python3.6
+
+[testenv:py37]
+basepython = python3.7
+
+[testenv:py3]
+basepython = python3
+
+[testenv:pep8]
+basepython = python3
+commands = flake8 {posargs}
+
+[testenv:venv]
+basepython = python3
+commands = {posargs}
+
+[flake8]
+ignore = E402,E226

unit_tests/__init__.py

@@ -0,0 +1,22 @@
+# Copyright 2019 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.
+
+import sys
+
+sys.path.append('src')
+sys.path.append('src/lib')
+
+# Mock out charmhelpers so that we can test without it.
+import charms_openstack.test_mocks  # noqa
+charms_openstack.test_mocks.mock_charmhelpers()

unit_tests/test_peers.py

@@ -0,0 +1,209 @@
+# Copyright 2019 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.
+
+import charms_openstack.test_utils as test_utils
+import mock
+import peers
+
+
+class TestRegisteredHooks(test_utils.TestRegisteredHooks):
+
+    def test_hooks(self):
+        defaults = []
+        hook_set = {
+            "when": {
+                "joined": (
+                    "endpoint.{endpoint_name}.joined",),
+
+                "changed": (
+                    "endpoint.{endpoint_name}.changed",),
+                "departed": ("endpoint.{endpoint_name}.broken",
+                             "endpoint.{endpoint_name}.departed",),
+            },
+        }
+        # test that the hooks were registered
+        self.registered_hooks_test_helper(peers, hook_set, defaults)
+
+
+class TestMySQLInnoDBClusterPeer(test_utils.PatchHelper):
+
+    def setUp(self):
+        super().setUp()
+        self._patches = {}
+        self._patches_start = {}
+        self.patch_object(peers.reactive, "clear_flag")
+        self.patch_object(peers.reactive, "set_flag")
+
+        _data = {
+            "cluster-address": None,
+            "cluster-user": None,
+            "cluster-password": None,
+            "unit-clustered": None}
+        self.fake_unit_0 = mock.MagicMock()
+        self.fake_unit_0.unit_name = "unit/0"
+        self.fake_unit_0.received = _data
+
+        self.fake_unit_1 = mock.MagicMock()
+        self.fake_unit_1.unit_name = "unit/1"
+        self.fake_unit_1.received = _data
+
+        self.fake_unit_2 = mock.MagicMock()
+        self.fake_unit_2.unit_name = "unit/2"
+        self.fake_unit_2.received = _data
+
+        self.fake_relation_id = "cluster:19"
+        self.fake_relation = mock.MagicMock()
+        self.fake_relation.relation_id = self.fake_relation_id
+        self.fake_relation.units = [
+            self.fake_unit_0,
+            self.fake_unit_1,
+            self.fake_unit_2]
+        self.fake_unit_0.relation = self.fake_relation
+        self.fake_unit_1.relation = self.fake_relation
+        self.fake_unit_2.relation = self.fake_relation
+
+        self.ep_name = "ep"
+        self.ep = peers.MySQLInnoDBClusterPeer(
+            self.ep_name, [self.fake_relation])
+        self.ep.ingress_address = "10.10.10.10"
+        self.ep.relations[0] = self.fake_relation
+
+    def tearDown(self):
+        self.ep = None
+        for k, v in self._patches.items():
+            v.stop()
+            setattr(self, k, None)
+        self._patches = None
+        self._patches_start = None
+
+    def test_joined(self):
+        self.ep.set_ingress_address = mock.MagicMock()
+        self.ep.joined()
+        self.set_flag.assert_called_once_with(
+            "{}.connected".format(self.ep_name))
+        self.ep.set_ingress_address.assert_called_once()
+
+    def test_changed_not_available(self):
+        self.ep.available = mock.MagicMock(return_value=False)
+        self.ep.clustered = mock.MagicMock(return_value=False)
+        self.ep.changed()
+
+        _calls = [
+            mock.call("endpoint.{}.changed.cluster-address"
+                      .format(self.ep_name)),
+            mock.call("endpoint.{}.changed.cluster-user"
+                      .format(self.ep_name)),
+            mock.call("endpoint.{}.changed.cluster-password"
+                      .format(self.ep_name)),
+            mock.call("endpoint.{}.changed.unit-configure-ready"
+                      .format(self.ep_name)),
+            mock.call("endpoint.{}.changed.unit-clustered"
+                      .format(self.ep_name)),
+            mock.call("{}.available".format(self.ep_name)),
+            mock.call("{}.clustered".format(self.ep_name))]
+        self.clear_flag.assert_has_calls(_calls, any_order=True)
+        self.set_flag.assert_not_called()
+
+    def test_changed_available(self):
+        self.ep.available = mock.MagicMock(return_value=True)
+        self.ep.clustered = mock.MagicMock(return_value=True)
+        self.ep.changed()
+
+        _ccalls = [
+            mock.call("endpoint.{}.changed.cluster-address"
+                      .format(self.ep_name)),
+            mock.call("endpoint.{}.changed.cluster-user"
+                      .format(self.ep_name)),
+            mock.call("endpoint.{}.changed.cluster-password"
+                      .format(self.ep_name)),
+            mock.call("endpoint.{}.changed.unit-configure-ready"
+                      .format(self.ep_name)),
+            mock.call("endpoint.{}.changed.unit-clustered"
+                      .format(self.ep_name))]
+        self.clear_flag.assert_has_calls(_ccalls, any_order=True)
+        _scalls = [
+            mock.call("{}.available".format(self.ep_name)),
+            mock.call("{}.clustered".format(self.ep_name))]
+        self.set_flag.assert_has_calls(_scalls, any_order=True)
+
+    def test_departed(self):
+        self.ep.departed()
+        _calls = [
+            mock.call("{}.available".format(self.ep_name)),
+            mock.call("{}.connected".format(self.ep_name))]
+        self.clear_flag.assert_has_calls(_calls, any_order=True)
+
+    def test_relation_ids(self):
+        self.assertEqual([self.fake_relation_id], self.ep.relation_ids())
+
+    def test_set_ingress_address(self):
+        _calls = [
+            mock.call("ingress-address", self.ep.ingress_address),
+            mock.call("private-address", self.ep.ingress_address)]
+        self.ep.set_ingress_address()
+        self.fake_relation.to_publish_raw.__setitem__.assert_has_calls(_calls)
+
+    def test_available_not_available(self):
+        self.assertFalse(self.ep.available())
+
+    def test_available_one_unit_not_available(self):
+        _data = {
+            "cluster-address": "10.5.0.21",
+            "cluster-user": "user",
+            "cluster-password": "pw"}
+        for unit in self.fake_relation.units:
+            unit.received = _data
+        self.fake_unit_2.received = {
+            "cluster-address": "10.5.0.26",
+            "cluster-user": None,
+            "cluster-password": "pass"}
+        self.assertFalse(self.ep.available())
+
+    def test_available_available(self):
+        _data = {
+            "cluster-address": "10.5.0.21",
+            "cluster-user": "user",
+            "cluster-password": "pw"}
+        for unit in self.fake_relation.units:
+            unit.received = _data
+        self.assertTrue(self.ep.available())
+
+    def test_clustered_not_clustered(self):
+        self.assertFalse(self.ep.clustered())
+
+    def test_clustered_one_unit_not_clustered(self):
+        _data = {"unit-clustered": True}
+        for unit in self.fake_relation.units:
+            unit.received = _data
+        self.fake_unit_2.received = {"unit-clustered": None}
+        self.assertFalse(self.ep.clustered())
+
+    def test_clustered_clustered(self):
+        _data = {"unit-clustered": True}
+        for unit in self.fake_relation.units:
+            unit.received = _data
+        self.assertTrue(self.ep.clustered())
+
+    def test_set_cluster_connection_info(self):
+        _pw = "fakepassword"
+        _user = "fakeuser"
+        self.ep.set_cluster_connection_info(
+            self.ep.ingress_address,
+            _user,
+            _pw)
+        _calls = [
+            mock.call("cluster-address", self.ep.ingress_address),
+            mock.call("cluster-user", _user),
+            mock.call("cluster-password", _pw)]
+        self.fake_relation.to_publish.__setitem__.assert_has_calls(_calls)