openstack/charm-interface-mysql-innodb-cluster
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MySQL InnoDB Cluster Interface

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* peers handles cluster communication
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David Ames 2019-10-04 07:50:33 -07:00
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.tox
.testrepository
.stestr/
__pycache__

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[DEFAULT]
test_path=./unit_tests
top_dir=./

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language: python
python:
- "3.6"
install: pip install tox-travis
env:
- ENV=pep8
- ENV=py3
script:
- tox -e $ENV

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# 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.

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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'

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# 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

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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

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[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

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# 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()

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# 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)