209 lines
7.8 KiB
Python
209 lines
7.8 KiB
Python
#!/usr/bin/python
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import json
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import relations.hacluster.common
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from charms.reactive import hook
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from charms.reactive import RelationBase
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from charms.reactive import scopes
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from charms.reactive.helpers import data_changed
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from charmhelpers.core import hookenv
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class HAClusterRequires(RelationBase):
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# The hacluster charm is a subordinate charm and really only works
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# for a single service to the HA Cluster relation, therefore set the
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# expected scope to be GLOBAL.
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scope = scopes.GLOBAL
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@hook('{requires:hacluster}-relation-joined')
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def joined(self):
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self.set_state('{relation_name}.connected')
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@hook('{requires:hacluster}-relation-changed')
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def changed(self):
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if self.is_clustered():
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self.set_state('{relation_name}.available')
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else:
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self.remove_state('{relation_name}.available')
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@hook('{requires:hacluster}-relation-{broken,departed}')
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def departed(self):
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self.remove_state('{relation_name}.available')
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self.remove_state('{relation_name}.connected')
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def is_clustered(self):
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"""Has the hacluster charm set clustered?
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The hacluster charm sets cluster=True when it determines it is ready.
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Check the relation data for clustered and force a boolean return.
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:returns: boolean
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"""
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clustered_values = self.get_remote_all('clustered')
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if clustered_values:
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# There is only ever one subordinate hacluster unit
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clustered = clustered_values[0]
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# Future versions of hacluster will return a bool
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# Current versions return a string
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if type(clustered) is bool:
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return clustered
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elif (clustered is not None and
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(clustered.lower() == 'true' or
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clustered.lower() == 'yes')):
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return True
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return False
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def bind_on(self, iface=None, mcastport=None):
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relation_data = {}
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if iface:
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relation_data['corosync_bindiface'] = iface
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if mcastport:
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relation_data['corosync_mcastport'] = mcastport
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if relation_data and data_changed('hacluster-bind_on', relation_data):
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self.set_local(**relation_data)
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self.set_remote(**relation_data)
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def manage_resources(self, crm):
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"""
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Request for the hacluster to manage the resources defined in the
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crm object.
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res = CRM()
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res.primitive('res_neutron_haproxy', 'lsb:haproxy',
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op='monitor interval="5s"')
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res.init_services('haproxy')
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res.clone('cl_nova_haproxy', 'res_neutron_haproxy')
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hacluster.manage_resources(crm)
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:param crm: CRM() instance - Config object for Pacemaker resources
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:returns: None
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"""
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relation_data = {
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'json_{}'.format(k): json.dumps(v, sort_keys=True)
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for k, v in crm.items() if v
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}
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if data_changed('hacluster-manage_resources', relation_data):
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self.set_local(**relation_data)
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self.set_remote(**relation_data)
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def bind_resources(self, iface, mcastport=None):
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"""Inform the ha subordinate about each service it should manage. The
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child class specifies the services via self.ha_resources
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:param iface: string - Network interface to bind to
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:param mcastport: int - Multicast port corosync should use for cluster
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management traffic
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"""
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if mcastport is None:
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mcastport = 4440
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resources = self.get_local('resources')
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self.bind_on(iface=iface, mcastport=mcastport)
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self.manage_resources(resources)
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def add_vip(self, name, vip, iface, netmask):
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"""Add a VirtualIP object for each user specified vip to self.resources
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:param name: string - Name of service
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:param vip: string - Virtual IP to be managed
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:param iface: string - Network interface to bind vip to
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:param netmask: string - Netmask for vip
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:returns: None
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"""
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resource_dict = self.get_local('resources')
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if resource_dict:
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resources = relations.hacluster.common.CRM(**resource_dict)
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else:
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resources = relations.hacluster.common.CRM()
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resources.add(
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relations.hacluster.common.VirtualIP(
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name,
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vip,
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nic=iface,
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cidr=netmask,))
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# Vip Group
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group = 'grp_{}_vips'.format(name)
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vip_res_group_members = []
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if resource_dict:
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vip_resources = resource_dict.get('resources')
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if vip_resources:
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for vip_res in vip_resources:
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if 'vip' in vip_res:
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vip_res_group_members.append(vip_res)
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resources.group(group, *vip_res_group_members)
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self.set_local(resources=resources)
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def add_init_service(self, name, service, clone=True):
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"""Add a InitService object for haproxy to self.resources
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:param name: string - Name of service
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:param service: string - Name service uses in init system
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:returns: None
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"""
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resource_dict = self.get_local('resources')
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if resource_dict:
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resources = relations.hacluster.common.CRM(**resource_dict)
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else:
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resources = relations.hacluster.common.CRM()
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resources.add(
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relations.hacluster.common.InitService(name, service, clone))
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self.set_local(resources=resources)
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def add_dnsha(self, name, ip, fqdn, endpoint_type):
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"""Add a DNS entry to self.resources
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:param name: string - Name of service
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:param ip: string - IP address dns entry should resolve to
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:param fqdn: string - The DNS entry name
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:param endpoint_type: string - Public, private, internal etc
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:returns: None
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"""
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resource_dict = self.get_local('resources')
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if resource_dict:
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resources = relations.hacluster.common.CRM(**resource_dict)
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else:
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resources = relations.hacluster.common.CRM()
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resources.add(
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relations.hacluster.common.DNSEntry(name, ip, fqdn, endpoint_type))
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# DNS Group
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group = 'grp_{}_hostnames'.format(name)
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dns_res_group_members = []
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if resource_dict:
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dns_resources = resource_dict.get('resources')
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if dns_resources:
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for dns_res in dns_resources:
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if 'hostname' in dns_res:
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dns_res_group_members.append(dns_res)
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resources.group(group, *dns_res_group_members)
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self.set_local(resources=resources)
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def get_remote_all(self, key, default=None):
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"""Return a list of all values presented by remote units for key"""
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values = []
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for conversation in self.conversations():
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for relation_id in conversation.relation_ids:
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for unit in hookenv.related_units(relation_id):
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value = hookenv.relation_get(key,
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unit,
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relation_id) or default
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if value:
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values.append(value)
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return list(set(values))
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