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hooks/nova_cc_context.py
 
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from charmhelpers.core.hookenv import relation_ids, relation_set
 
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from charmhelpers.core.host import apt_install, filter_installed_packages
 
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from charmhelpers.contrib.openstack import context, utils
 
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#from charmhelpers.contrib.hahelpers.cluster import (
 
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#    determine_api_port,
 
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#    determine_haproxy_port,
 
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#)
 
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class ApacheSSLContext(context.ApacheSSLContext):
 
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    interfaces = ['https']
 
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    external_ports = []
 
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    service_namespace = 'nova'
 
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    def __call__(self):
 
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        # late import to work around circular dependency
 
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        from nova_cc_utils import determine_ports
 
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        self.external_ports = determine_ports()
 
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        return super(ApacheSSLContext, self).__call__()
 
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class VolumeServiceContext(context.OSContextGenerator):
 
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    interfaces = []
 
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    def __call__(self):
 
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        ctxt = {}
 
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        os_vers = utils.get_os_codename_package('nova-common')
 
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        if (relation_ids('nova-volume-service') and
 
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           os_vers in ['essex', 'folsom']):
 
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            # legacy nova-volume support, only supported in E and F
 
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            ctxt['volume_service_config'] = 'nova.volume.api.API'
 
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            install_pkg = filter_installed_packages(['nova-api-os-volume'])
 
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            if install_pkg:
 
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                apt_install(install_pkg)
 
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        elif relation_ids('cinder-volume-service'):
 
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            ctxt['volume_service_config'] = 'nova.volume.cinder.API'
 
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            # kick all compute nodes to know they should use cinder now.
 
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            [relation_set(volume_service='cinder', rid=rid)
 
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             for rid in relation_ids('cloud-compute')]
 
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        return ctxt
 
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class HAProxyContext(context.OSContextGenerator):
 
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    interfaces = ['ceph']
 
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    def __call__(self):
 
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        '''
 
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        Extends the main charmhelpers HAProxyContext with a port mapping
 
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        specific to this charm.
 
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        Also used to extend nova.conf context with correct api_listening_ports
 
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        '''
 
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        # TODO