PLUMgrid gateway initial charm

2015-05-19 14:07:07 -07:00 · 2015-05-19 14:07:07 -07:00 · 2e2935412a
commit 2e2935412a
45 changed files with 1602 additions and 0 deletions
--- a/.coverage
+++ b/.coverage
--- a/.project
+++ b/.project
@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>neutron-openvswitch</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.python.pydev.PyDevBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.python.pydev.pythonNature</nature>
+	</natures>
+</projectDescription>
--- a/.pydevproject
+++ b/.pydevproject
@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<?eclipse-pydev version="1.0"?><pydev_project>
+<pydev_property name="org.python.pydev.PYTHON_PROJECT_VERSION">python 2.7</pydev_property>
+<pydev_property name="org.python.pydev.PYTHON_PROJECT_INTERPRETER">Default</pydev_property>
+<pydev_pathproperty name="org.python.pydev.PROJECT_SOURCE_PATH">
+<path>/neutron-openvswitch/hooks</path>
+<path>/neutron-openvswitch/unit_tests</path>
+</pydev_pathproperty>
+</pydev_project>
--- a/24
+++ b/24
@ -0,0 +1,24 @@
+#!/usr/bin/make
+PYTHON := /usr/bin/env python
+
+lint:
+	@flake8 --exclude hooks/charmhelpers hooks
+	@flake8 --exclude hooks/charmhelpers unit_tests
+	@charm proof
+
+unit_test:
+	@echo Starting tests...
+	@$(PYTHON) /usr/bin/nosetests --nologcapture unit_tests
+
+bin/charm_helpers_sync.py:
+	@mkdir -p bin
+	@bzr cat lp:charm-helpers/tools/charm_helpers_sync/charm_helpers_sync.py \
+        > bin/charm_helpers_sync.py
+
+sync: bin/charm_helpers_sync.py
+	@$(PYTHON) bin/charm_helpers_sync.py -c charm-helpers-sync.yaml
+	patch -p0 < ~/profsvcs/canonical/charms/charmhelpers.patch
+
+publish: lint unit_test
+	bzr push lp:charms/plumgrid-gateway
+	bzr push lp:charms/trusty/plumgrid-gateway
--- a/README.md
+++ b/README.md
@ -0,0 +1,16 @@
+# Overview
+
+This charm provides the PLUMgrid Gateway configuration for a node.
+
+
+# Usage
+
+To deploy (partial deployment of linked charms only):
+
+    juju deploy neutron-api
+    juju deploy neutron-iovisor
+    juju deploy plumgrid-director
+    juju deploy plumgrid-gateway
+    juju add-relation plumgrid-gateway neutron-iovisor
+    juju add-relation plumgrid-gateway plumgrid-director
+
--- a/bin/charm_helpers_sync.py
+++ b/bin/charm_helpers_sync.py
@ -0,0 +1,253 @@
+#!/usr/bin/python
+
+# Copyright 2014-2015 Canonical Limited.
+#
+# This file is part of charm-helpers.
+#
+# charm-helpers is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License version 3 as
+# published by the Free Software Foundation.
+#
+# charm-helpers is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with charm-helpers.  If not, see <http://www.gnu.org/licenses/>.
+
+# Authors:
+#   Adam Gandelman <adamg@ubuntu.com>
+
+import logging
+import optparse
+import os
+import subprocess
+import shutil
+import sys
+import tempfile
+import yaml
+from fnmatch import fnmatch
+
+import six
+
+CHARM_HELPERS_BRANCH = 'lp:charm-helpers'
+
+
+def parse_config(conf_file):
+    if not os.path.isfile(conf_file):
+        logging.error('Invalid config file: %s.' % conf_file)
+        return False
+    return yaml.load(open(conf_file).read())
+
+
+def clone_helpers(work_dir, branch):
+    dest = os.path.join(work_dir, 'charm-helpers')
+    logging.info('Checking out %s to %s.' % (branch, dest))
+    cmd = ['bzr', 'checkout', '--lightweight', branch, dest]
+    subprocess.check_call(cmd)
+    return dest
+
+
+def _module_path(module):
+    return os.path.join(*module.split('.'))
+
+
+def _src_path(src, module):
+    return os.path.join(src, 'charmhelpers', _module_path(module))
+
+
+def _dest_path(dest, module):
+    return os.path.join(dest, _module_path(module))
+
+
+def _is_pyfile(path):
+    return os.path.isfile(path + '.py')
+
+
+def ensure_init(path):
+    '''
+    ensure directories leading up to path are importable, omitting
+    parent directory, eg path='/hooks/helpers/foo'/:
+        hooks/
+        hooks/helpers/__init__.py
+        hooks/helpers/foo/__init__.py
+    '''
+    for d, dirs, files in os.walk(os.path.join(*path.split('/')[:2])):
+        _i = os.path.join(d, '__init__.py')
+        if not os.path.exists(_i):
+            logging.info('Adding missing __init__.py: %s' % _i)
+            open(_i, 'wb').close()
+
+
+def sync_pyfile(src, dest):
+    src = src + '.py'
+    src_dir = os.path.dirname(src)
+    logging.info('Syncing pyfile: %s -> %s.' % (src, dest))
+    if not os.path.exists(dest):
+        os.makedirs(dest)
+    shutil.copy(src, dest)
+    if os.path.isfile(os.path.join(src_dir, '__init__.py')):
+        shutil.copy(os.path.join(src_dir, '__init__.py'),
+                    dest)
+    ensure_init(dest)
+
+
+def get_filter(opts=None):
+    opts = opts or []
+    if 'inc=*' in opts:
+        # do not filter any files, include everything
+        return None
+
+    def _filter(dir, ls):
+        incs = [opt.split('=').pop() for opt in opts if 'inc=' in opt]
+        _filter = []
+        for f in ls:
+            _f = os.path.join(dir, f)
+
+            if not os.path.isdir(_f) and not _f.endswith('.py') and incs:
+                if True not in [fnmatch(_f, inc) for inc in incs]:
+                    logging.debug('Not syncing %s, does not match include '
+                                  'filters (%s)' % (_f, incs))
+                    _filter.append(f)
+                else:
+                    logging.debug('Including file, which matches include '
+                                  'filters (%s): %s' % (incs, _f))
+            elif (os.path.isfile(_f) and not _f.endswith('.py')):
+                logging.debug('Not syncing file: %s' % f)
+                _filter.append(f)
+            elif (os.path.isdir(_f) and not
+                  os.path.isfile(os.path.join(_f, '__init__.py'))):
+                logging.debug('Not syncing directory: %s' % f)
+                _filter.append(f)
+        return _filter
+    return _filter
+
+
+def sync_directory(src, dest, opts=None):
+    if os.path.exists(dest):
+        logging.debug('Removing existing directory: %s' % dest)
+        shutil.rmtree(dest)
+    logging.info('Syncing directory: %s -> %s.' % (src, dest))
+
+    shutil.copytree(src, dest, ignore=get_filter(opts))
+    ensure_init(dest)
+
+
+def sync(src, dest, module, opts=None):
+
+    # Sync charmhelpers/__init__.py for bootstrap code.
+    sync_pyfile(_src_path(src, '__init__'), dest)
+
+    # Sync other __init__.py files in the path leading to module.
+    m = []
+    steps = module.split('.')[:-1]
+    while steps:
+        m.append(steps.pop(0))
+        init = '.'.join(m + ['__init__'])
+        sync_pyfile(_src_path(src, init),
+                    os.path.dirname(_dest_path(dest, init)))
+
+    # Sync the module, or maybe a .py file.
+    if os.path.isdir(_src_path(src, module)):
+        sync_directory(_src_path(src, module), _dest_path(dest, module), opts)
+    elif _is_pyfile(_src_path(src, module)):
+        sync_pyfile(_src_path(src, module),
+                    os.path.dirname(_dest_path(dest, module)))
+    else:
+        logging.warn('Could not sync: %s. Neither a pyfile or directory, '
+                     'does it even exist?' % module)
+
+
+def parse_sync_options(options):
+    if not options:
+        return []
+    return options.split(',')
+
+
+def extract_options(inc, global_options=None):
+    global_options = global_options or []
+    if global_options and isinstance(global_options, six.string_types):
+        global_options = [global_options]
+    if '|' not in inc:
+        return (inc, global_options)
+    inc, opts = inc.split('|')
+    return (inc, parse_sync_options(opts) + global_options)
+
+
+def sync_helpers(include, src, dest, options=None):
+    if not os.path.isdir(dest):
+        os.makedirs(dest)
+
+    global_options = parse_sync_options(options)
+
+    for inc in include:
+        if isinstance(inc, str):
+            inc, opts = extract_options(inc, global_options)
+            sync(src, dest, inc, opts)
+        elif isinstance(inc, dict):
+            # could also do nested dicts here.
+            for k, v in six.iteritems(inc):
+                if isinstance(v, list):
+                    for m in v:
+                        inc, opts = extract_options(m, global_options)
+                        sync(src, dest, '%s.%s' % (k, inc), opts)
+
+if __name__ == '__main__':
+    parser = optparse.OptionParser()
+    parser.add_option('-c', '--config', action='store', dest='config',
+                      default=None, help='helper config file')
+    parser.add_option('-D', '--debug', action='store_true', dest='debug',
+                      default=False, help='debug')
+    parser.add_option('-b', '--branch', action='store', dest='branch',
+                      help='charm-helpers bzr branch (overrides config)')
+    parser.add_option('-d', '--destination', action='store', dest='dest_dir',
+                      help='sync destination dir (overrides config)')
+    (opts, args) = parser.parse_args()
+
+    if opts.debug:
+        logging.basicConfig(level=logging.DEBUG)
+    else:
+        logging.basicConfig(level=logging.INFO)
+
+    if opts.config:
+        logging.info('Loading charm helper config from %s.' % opts.config)
+        config = parse_config(opts.config)
+        if not config:
+            logging.error('Could not parse config from %s.' % opts.config)
+            sys.exit(1)
+    else:
+        config = {}
+
+    if 'branch' not in config:
+        config['branch'] = CHARM_HELPERS_BRANCH
+    if opts.branch:
+        config['branch'] = opts.branch
+    if opts.dest_dir:
+        config['destination'] = opts.dest_dir
+
+    if 'destination' not in config:
+        logging.error('No destination dir. specified as option or config.')
+        sys.exit(1)
+
+    if 'include' not in config:
+        if not args:
+            logging.error('No modules to sync specified as option or config.')
+            sys.exit(1)
+        config['include'] = []
+        [config['include'].append(a) for a in args]
+
+    sync_options = None
+    if 'options' in config:
+        sync_options = config['options']
+    tmpd = tempfile.mkdtemp()
+    try:
+        checkout = clone_helpers(tmpd, config['branch'])
+        sync_helpers(config['include'], checkout, config['destination'],
+                     options=sync_options)
+    except Exception as e:
+        logging.error("Could not sync: %s" % e)
+        raise e
+    finally:
+        logging.debug('Cleaning up %s' % tmpd)
+        shutil.rmtree(tmpd)
--- a/charm-helpers-sync.yaml
+++ b/charm-helpers-sync.yaml
@ -0,0 +1,12 @@
+branch: lp:charm-helpers
+destination: hooks/charmhelpers
+include:
+    - core
+    - fetch
+    - contrib.openstack|inc=*
+    - contrib.hahelpers
+    - contrib.network.ovs
+    - contrib.storage.linux
+    - payload.execd
+    - contrib.network.ip
+    - contrib.python.packages
--- a/config.yaml
+++ b/config.yaml
@ -0,0 +1,5 @@
+options:
+  external-interface:
+    default: eth1
+    type: string
+    description: The interface that will provide external connectivity
--- a/9
+++ b/9
@ -0,0 +1,9 @@
+Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0
+
+Files: *
+Copyright: 2012, Canonical Ltd.
+License: GPL-3
+
+License: GPL-3
+ On Debian GNU/Linux system you can find the complete text of the
+ GPL-3 license in '/usr/share/common-licenses/GPL-3'
--- a/hooks/config-changed
+++ b/hooks/config-changed
@ -0,0 +1 @@
+pg_gw_hooks.py
--- a/hooks/install
+++ b/hooks/install
@ -0,0 +1 @@
+pg_gw_hooks.py
--- a/hooks/neutron-plugin-api-relation-broken
+++ b/hooks/neutron-plugin-api-relation-broken
@ -0,0 +1 @@
+pg_gw_hooks.py
--- a/hooks/neutron-plugin-api-relation-changed
+++ b/hooks/neutron-plugin-api-relation-changed
@ -0,0 +1 @@
+pg_gw_hooks.py
--- a/hooks/neutron-plugin-api-relation-departed
+++ b/hooks/neutron-plugin-api-relation-departed
@ -0,0 +1 @@
+pg_gw_hooks.py
--- a/hooks/neutron-plugin-api-relation-joined
+++ b/hooks/neutron-plugin-api-relation-joined
@ -0,0 +1 @@
+pg_gw_hooks.py
--- a/hooks/pg_gw_context.py
+++ b/hooks/pg_gw_context.py
@ -0,0 +1,93 @@
+from charmhelpers.core.hookenv import (
+    relation_ids,
+    related_units,
+    relation_get,
+    config,
+)
+from charmhelpers.contrib.openstack import context
+
+from socket import gethostname as get_unit_hostname
+
+'''
+#This function will be used to get information from neutron-api
+def _neutron_api_settings():
+    neutron_settings = {
+        'neutron_security_groups': False,
+        'l2_population': True,
+        'overlay_network_type': 'gre',
+    }
+    for rid in relation_ids('neutron-plugin-api'):
+        for unit in related_units(rid):
+            rdata = relation_get(rid=rid, unit=unit)
+            if 'l2-population' not in rdata:
+                continue
+            neutron_settings = {
+                'l2_population': rdata['l2-population'],
+                'neutron_security_groups': rdata['neutron-security-groups'],
+                'overlay_network_type': rdata['overlay-network-type'],
+            }
+            # Override with configuration if set to true
+            if config('disable-security-groups'):
+                neutron_settings['neutron_security_groups'] = False
+            return neutron_settings
+    return neutron_settings
+'''
+
+
+def _pg_dir_settings():
+    '''
+    Inspects current neutron-plugin relation
+    '''
+    pg_settings = {
+        'pg_dir_ip': '192.168.100.201',
+    }
+    for rid in relation_ids('plumgrid'):
+        for unit in related_units(rid):
+            rdata = relation_get(rid=rid, unit=unit)
+            pg_settings = {
+                'pg_dir_ip': rdata['private-address'],
+            }
+    return pg_settings
+
+
+class PGGwContext(context.NeutronContext):
+    interfaces = []
+
+    @property
+    def plugin(self):
+        return 'plumgrid'
+
+    @property
+    def network_manager(self):
+        return 'neutron'
+
+    def _save_flag_file(self):
+        pass
+
+    #@property
+    #def neutron_security_groups(self):
+    #    neutron_api_settings = _neutron_api_settings()
+    #    return neutron_api_settings['neutron_security_groups']
+
+    def pg_ctxt(self):
+        #Generated Config for all Plumgrid templates inside
+        #the templates folder
+        pg_ctxt = super(PGGwContext, self).pg_ctxt()
+        if not pg_ctxt:
+            return {}
+
+        conf = config()
+        pg_dir_settings = _pg_dir_settings()
+        pg_ctxt['local_ip'] = pg_dir_settings['pg_dir_ip']
+
+        #neutron_api_settings = _neutron_api_settings()
+        #TODO: Either get this value from the director or neutron-api charm
+        unit_hostname = get_unit_hostname()
+        pg_ctxt['pg_hostname'] = unit_hostname
+        pg_ctxt['interface'] = "juju-br0"
+        pg_ctxt['label'] = unit_hostname
+        pg_ctxt['fabric_mode'] = 'host'
+
+        pg_ctxt['ext_interface'] = conf['external-interface']
+
+        return pg_ctxt
--- a/hooks/pg_gw_hooks.py
+++ b/hooks/pg_gw_hooks.py
@ -0,0 +1,47 @@
+#!/usr/bin/python
+
+import sys
+
+from charmhelpers.core.hookenv import (
+    Hooks,
+    UnregisteredHookError,
+    log,
+)
+
+from pg_gw_utils import (
+    register_configs,
+    ensure_files,
+    restart_pg,
+    stop_pg,
+)
+
+hooks = Hooks()
+CONFIGS = register_configs()
+
+
+@hooks.hook()
+def install():
+    ensure_files()
+
+
+@hooks.hook('plumgrid-plugin-relation-joined')
+def plumgrid_dir():
+    ensure_files()
+    CONFIGS.write_all()
+    restart_pg()
+
+
+@hooks.hook('stop')
+def stop():
+    stop_pg()
+
+
+def main():
+    try:
+        hooks.execute(sys.argv)
+    except UnregisteredHookError as e:
+        log('Unknown hook {} - skipping.'.format(e))
+
+
+if __name__ == '__main__':
+    main()
--- a/hooks/pg_gw_utils.py
+++ b/hooks/pg_gw_utils.py
@ -0,0 +1,128 @@
+from charmhelpers.contrib.openstack.neutron import neutron_plugin_attribute
+from copy import deepcopy
+from charmhelpers.core.hookenv import log
+from charmhelpers.core.host import (
+    write_file,
+)
+from charmhelpers.contrib.openstack import templating
+from collections import OrderedDict
+from charmhelpers.contrib.openstack.utils import (
+    os_release,
+)
+import pg_gw_context
+import subprocess
+import time
+
+#Dont need these right now
+NOVA_CONF_DIR = "/etc/nova"
+NEUTRON_CONF_DIR = "/etc/neutron"
+NEUTRON_CONF = '%s/neutron.conf' % NEUTRON_CONF_DIR
+NEUTRON_DEFAULT = '/etc/default/neutron-server'
+
+#Puppet Files
+P_PGKA_CONF = '/opt/pg/etc/puppet/modules/sal/templates/keepalived.conf.erb'
+P_PG_CONF = '/opt/pg/etc/puppet/modules/plumgrid/templates/plumgrid.conf.erb'
+P_PGDEF_CONF = '/opt/pg/etc/puppet/modules/sal/templates/default.conf.erb'
+
+#Plumgrid Files
+PGKA_CONF = '/var/lib/libvirt/filesystems/plumgrid/etc/keepalived/keepalived.conf'
+PG_CONF = '/var/lib/libvirt/filesystems/plumgrid/opt/pg/etc/plumgrid.conf'
+PGDEF_CONF = '/var/lib/libvirt/filesystems/plumgrid/opt/pg/sal/nginx/conf.d/default.conf'
+PGHN_CONF = '/var/lib/libvirt/filesystems/plumgrid-data/conf/etc/hostname'
+PGHS_CONF = '/var/lib/libvirt/filesystems/plumgrid-data/conf/etc/hosts'
+PGIFCS_CONF = '/var/lib/libvirt/filesystems/plumgrid-data/conf/pg/ifcs.conf'
+IFCTL_CONF = '/var/run/plumgrid/lxc/ifc_list_gateway'
+IFCTL_P_CONF = '/var/lib/libvirt/filesystems/plumgrid/var/run/plumgrid/lxc/ifc_list_gateway'
+
+#EDGE SPECIFIC
+SUDOERS_CONF = '/etc/sudoers.d/ifc_ctl_sudoers'
+FILTERS_CONF_DIR = '/etc/nova/rootwrap.d'
+FILTERS_CONF = '%s/network.filters' % FILTERS_CONF_DIR
+
+BASE_RESOURCE_MAP = OrderedDict([
+    (PG_CONF, {
+        'services': ['plumgrid'],
+        'contexts': [pg_gw_context.PGGwContext()],
+    }),
+    (PGHN_CONF, {
+        'services': ['plumgrid'],
+        'contexts': [pg_gw_context.PGGwContext()],
+    }),
+    (PGHS_CONF, {
+        'services': ['plumgrid'],
+        'contexts': [pg_gw_context.PGGwContext()],
+    }),
+    (PGIFCS_CONF, {
+        'services': [],
+        'contexts': [pg_gw_context.PGGwContext()],
+    }),
+    (FILTERS_CONF, {
+        'services': [],
+        'contexts': [pg_gw_context.PGGwContext()],
+    }),
+])
+
+TEMPLATES = 'templates/'
+
+
+def determine_packages():
+    return neutron_plugin_attribute('plumgrid', 'packages', 'neutron')
+
+
+def register_configs(release=None):
+    release = release or os_release('neutron-common', base='icehouse')
+    configs = templating.OSConfigRenderer(templates_dir=TEMPLATES,
+                                          openstack_release=release)
+    for cfg, rscs in resource_map().iteritems():
+        configs.register(cfg, rscs['contexts'])
+    return configs
+
+
+def resource_map():
+    '''
+    Dynamically generate a map of resources that will be managed for a single
+    hook execution.
+    '''
+    resource_map = deepcopy(BASE_RESOURCE_MAP)
+    return resource_map
+
+
+def restart_map():
+    '''
+    Constructs a restart map based on charm config settings and relation
+    state.
+    '''
+    return {k: v['services'] for k, v in resource_map().iteritems()}
+
+
+def ensure_files():
+    _exec_cmd(cmd=['cp', '--remove-destination', '-f', P_PG_CONF, PG_CONF])
+    write_file(SUDOERS_CONF, "\nnova ALL=(root) NOPASSWD: /opt/pg/bin/ifc_ctl_pp *\n", owner='root', group='root', perms=0o644)
+    _exec_cmd(cmd=['mkdir', '-p', FILTERS_CONF_DIR])
+    _exec_cmd(cmd=['touch', FILTERS_CONF])
+
+
+def restart_pg():
+    _exec_cmd(cmd=['virsh', '-c', 'lxc:', 'destroy', 'plumgrid'], error_msg='ERROR Destroying PLUMgrid')
+    _exec_cmd(cmd=['rm', IFCTL_CONF, IFCTL_P_CONF], error_msg='ERROR Removing ifc_ctl_gateway file')
+    _exec_cmd(cmd=['iptables', '-F'])
+    _exec_cmd(cmd=['virsh', '-c', 'lxc:', 'start', 'plumgrid'], error_msg='ERROR Starting PLUMgrid')
+    time.sleep(5)
+    _exec_cmd(cmd=['service', 'plumgrid', 'start'], error_msg='ERROR starting PLUMgrid service')
+    time.sleep(5)
+
+
+def stop_pg():
+    _exec_cmd(cmd=['virsh', '-c', 'lxc:', 'destroy', 'plumgrid'], error_msg='ERROR Destroying PLUMgrid')
+    time.sleep(2)
+    _exec_cmd(cmd=['rm', IFCTL_CONF, IFCTL_P_CONF], error_msg='ERROR Removing ifc_ctl_gateway file')
+
+
+def _exec_cmd(cmd=None, error_msg='Command exited with ERRORs'):
+    if cmd is None:
+        log("NO command")
+    else:
+        try:
+            subprocess.check_call(cmd)
+        except subprocess.CalledProcessError, e:
+            log(error_msg)
--- a/hooks/plumgrid-plugin-relation-broken
+++ b/hooks/plumgrid-plugin-relation-broken
@ -0,0 +1 @@
+pg_gw_hooks.py
--- a/hooks/plumgrid-plugin-relation-changed
+++ b/hooks/plumgrid-plugin-relation-changed
@ -0,0 +1 @@
+pg_gw_hooks.py
--- a/hooks/plumgrid-plugin-relation-departed
+++ b/hooks/plumgrid-plugin-relation-departed
@ -0,0 +1 @@
+pg_gw_hooks.py
--- a/hooks/plumgrid-plugin-relation-joined
+++ b/hooks/plumgrid-plugin-relation-joined
@ -0,0 +1 @@
+pg_gw_hooks.py
--- a/hooks/plumgrid-relation-broken
+++ b/hooks/plumgrid-relation-broken
@ -0,0 +1 @@
+pg_gw_hooks.py
--- a/hooks/plumgrid-relation-changed
+++ b/hooks/plumgrid-relation-changed
@ -0,0 +1 @@
+pg_gw_hooks.py
--- a/hooks/plumgrid-relation-departed
+++ b/hooks/plumgrid-relation-departed
@ -0,0 +1 @@
+pg_gw_hooks.py
--- a/hooks/plumgrid-relation-joined
+++ b/hooks/plumgrid-relation-joined
@ -0,0 +1 @@
+pg_gw_hooks.py
--- a/hooks/stop
+++ b/hooks/stop
@ -0,0 +1 @@
+pg_gw_hooks.py
--- a/hooks/upgrade-charm
+++ b/hooks/upgrade-charm
@ -0,0 +1 @@
+pg_gw_hooks.py
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@ -0,0 +1,304 @@
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--- a/metadata.yaml
+++ b/metadata.yaml
@ -0,0 +1,24 @@
+name: plumgrid-gateway
+subordinate: false
+maintainer: Bilal Baqar <bbaqar@plumgrid.com>
+summary: "OpenStack Neutron OpenvSwitch Agent"
+description: |
+  Neutron is a virtual network service for Openstack, and a part of
+  Netstack. Just like OpenStack Nova provides an API to dynamically
+  request and configure virtual servers, Neutron provides an API to
+  dynamically request and configure virtual networks. These networks
+  connect "interfaces" from other OpenStack services (e.g., virtual NICs
+  from Nova VMs). The Neutron API supports extensions to provide
+  advanced network capabilities (e.g., QoS, ACLs, network monitoring,
+  etc.)
+  .
+  This charm provides the Plumgrid Gateway
+tags:
+  - openstack
+requires:
+  plumgrid-plugin:
+    interface: plumgrid-plugin
+  plumgrid:
+    interface: plumgrid
+  neutron-plugin-api:
+    interface: neutron-plugin-api
--- a/setup.cfg
+++ b/setup.cfg
@ -0,0 +1,5 @@
+[nosetests]
+verbosity=1
+with-coverage=1
+cover-erase=1
+cover-package=hooks
--- a/templates/icehouse/hostname
+++ b/templates/icehouse/hostname
@ -0,0 +1,2 @@
+{{ pg_hostname }}
+
--- a/templates/icehouse/hosts
+++ b/templates/icehouse/hosts
@ -0,0 +1,10 @@
+127.0.0.1   localhost
+127.0.1.1   {{ pg_hostname }}
+
+# The following lines are desirable for IPv6 capable hosts
+::1     ip6-localhost ip6-loopback
+fe00::0 ip6-localnet
+ff00::0 ip6-mcastprefix
+ff02::1 ip6-allnodes
+ff02::2 ip6-allrouters
+
--- a/templates/icehouse/ifcs.conf
+++ b/templates/icehouse/ifcs.conf
@ -0,0 +1,6 @@
+{{ interface }} = fabric_core host
+{% if ext_interface -%}
+{{ ext_interface }} = access_phys
+
+{% endif -%}
+
--- a/templates/icehouse/network.filters
+++ b/templates/icehouse/network.filters
@ -0,0 +1,94 @@
+# nova-rootwrap command filters for network nodes
+# This file should be owned by (and only-writeable by) the root user
+
+[Filters]
+# nova/virt/libvirt/vif.py: 'ip', 'tuntap', 'add', dev, 'mode', 'tap'
+# nova/virt/libvirt/vif.py: 'ip', 'link', 'set', dev, 'up'
+# nova/virt/libvirt/vif.py: 'ip', 'link', 'delete', dev
+# nova/network/linux_net.py: 'ip', 'addr', 'add', str(floating_ip)+'/32'i..
+# nova/network/linux_net.py: 'ip', 'addr', 'del', str(floating_ip)+'/32'..
+# nova/network/linux_net.py: 'ip', 'addr', 'add', '169.254.169.254/32',..
+# nova/network/linux_net.py: 'ip', 'addr', 'show', 'dev', dev, 'scope',..
+# nova/network/linux_net.py: 'ip', 'addr', 'del/add', ip_params, dev)
+# nova/network/linux_net.py: 'ip', 'addr', 'del', params, fields[-1]
+# nova/network/linux_net.py: 'ip', 'addr', 'add', params, bridge
+# nova/network/linux_net.py: 'ip', '-f', 'inet6', 'addr', 'change', ..
+# nova/network/linux_net.py: 'ip', 'link', 'set', 'dev', dev, 'promisc',..
+# nova/network/linux_net.py: 'ip', 'link', 'add', 'link', bridge_if ...
+# nova/network/linux_net.py: 'ip', 'link', 'set', interface, address,..
+# nova/network/linux_net.py: 'ip', 'link', 'set', interface, 'up'
+# nova/network/linux_net.py: 'ip', 'link', 'set', bridge, 'up'
+# nova/network/linux_net.py: 'ip', 'addr', 'show', 'dev', interface, ..
+# nova/network/linux_net.py: 'ip', 'link', 'set', dev, address, ..
+# nova/network/linux_net.py: 'ip', 'link', 'set', dev, 'up'
+# nova/network/linux_net.py: 'ip', 'route', 'add', ..
+# nova/network/linux_net.py: 'ip', 'route', 'del', .
+# nova/network/linux_net.py: 'ip', 'route', 'show', 'dev', dev
+ip: CommandFilter, ip, root
+
+# nova/virt/libvirt/vif.py: 'ovs-vsctl', ...
+# nova/virt/libvirt/vif.py: 'ovs-vsctl', 'del-port', ...
+# nova/network/linux_net.py: 'ovs-vsctl', ....
+ovs-vsctl: CommandFilter, ovs-vsctl, root
+
+# nova/network/linux_net.py: 'ovs-ofctl', ....
+ovs-ofctl: CommandFilter, ovs-ofctl, root
+
+# nova/virt/libvirt/vif.py: 'ivs-ctl', ...
+# nova/virt/libvirt/vif.py: 'ivs-ctl', 'del-port', ...
+# nova/network/linux_net.py: 'ivs-ctl', ....
+ivs-ctl: CommandFilter, ivs-ctl, root
+
+# nova/virt/libvirt/vif.py: 'ifc_ctl', ...
+ifc_ctl: CommandFilter, /opt/pg/bin/ifc_ctl, root
+
+# nova/virt/libvirt/vif.py: 'ebrctl', ...
+ebrctl: CommandFilter, ebrctl, root
+
+# nova/virt/libvirt/vif.py: 'mm-ctl', ...
+mm-ctl: CommandFilter, mm-ctl, root
+
+# nova/network/linux_net.py: 'ebtables', '-D' ...
+# nova/network/linux_net.py: 'ebtables', '-I' ...
+ebtables: CommandFilter, ebtables, root
+ebtables_usr: CommandFilter, ebtables, root
+
+# nova/network/linux_net.py: 'ip[6]tables-save' % (cmd, '-t', ...
+iptables-save: CommandFilter, iptables-save, root
+ip6tables-save: CommandFilter, ip6tables-save, root
+
+# nova/network/linux_net.py: 'ip[6]tables-restore' % (cmd,)
+iptables-restore: CommandFilter, iptables-restore, root
+ip6tables-restore: CommandFilter, ip6tables-restore, root
+
+# nova/network/linux_net.py: 'arping', '-U', floating_ip, '-A', '-I', ...
+# nova/network/linux_net.py: 'arping', '-U', network_ref['dhcp_server'],..
+arping: CommandFilter, arping, root
+
+# nova/network/linux_net.py: 'dhcp_release', dev, address, mac_address
+dhcp_release: CommandFilter, dhcp_release, root
+
+# nova/network/linux_net.py: 'kill', '-9', pid
+# nova/network/linux_net.py: 'kill', '-HUP', pid
+kill_dnsmasq: KillFilter, root, /usr/sbin/dnsmasq, -9, -HUP
+
+# nova/network/linux_net.py: 'kill', pid
+kill_radvd: KillFilter, root, /usr/sbin/radvd
+
+# nova/network/linux_net.py: dnsmasq call
+dnsmasq: EnvFilter, env, root, CONFIG_FILE=, NETWORK_ID=, dnsmasq
+
+# nova/network/linux_net.py: 'radvd', '-C', '%s' % _ra_file(dev, 'conf'..
+radvd: CommandFilter, radvd, root
+
+# nova/network/linux_net.py: 'brctl', 'addbr', bridge
+# nova/network/linux_net.py: 'brctl', 'setfd', bridge, 0
+# nova/network/linux_net.py: 'brctl', 'stp', bridge, 'off'
+# nova/network/linux_net.py: 'brctl', 'addif', bridge, interface
+brctl: CommandFilter, brctl, root
+
+# nova/network/linux_net.py: 'sysctl', ....
+sysctl: CommandFilter, sysctl, root
+
+# nova/network/linux_net.py: 'conntrack'
+conntrack: CommandFilter, conntrack, root
--- a/templates/icehouse/plumgrid.conf
+++ b/templates/icehouse/plumgrid.conf
@ -0,0 +1,11 @@
+plumgrid_ip={{ local_ip }}
+plumgrid_port=8001
+mgmt_dev={{ interface }}
+label={{ label}}
+plumgrid_rsync_port=2222
+plumgrid_rest_addr=0.0.0.0:9180
+fabric_mode={{ fabric_mode }}
+start_plumgrid_iovisor=yes
+start_plumgrid=`/opt/pg/scripts/pg_is_director.sh $plumgrid_ip`
+location=
+
--- a/templates/parts/rabbitmq
+++ b/templates/parts/rabbitmq
@ -0,0 +1,21 @@
+{% if rabbitmq_host or rabbitmq_hosts -%}
+rabbit_userid = {{ rabbitmq_user }}
+rabbit_virtual_host = {{ rabbitmq_virtual_host }}
+rabbit_password = {{ rabbitmq_password }}
+{% if rabbitmq_hosts -%}
+rabbit_hosts = {{ rabbitmq_hosts }}
+{% if rabbitmq_ha_queues -%}
+rabbit_ha_queues = True
+rabbit_durable_queues = False
+{% endif -%}
+{% else -%}
+rabbit_host = {{ rabbitmq_host }}
+{% endif -%}
+{% if rabbit_ssl_port -%}
+rabbit_use_ssl = True
+rabbit_port = {{ rabbit_ssl_port }}
+{% if rabbit_ssl_ca -%}
+kombu_ssl_ca_certs = {{ rabbit_ssl_ca }}
+{% endif -%}
+{% endif -%}
+{% endif -%}
--- a/tests/00-setup
+++ b/tests/00-setup
@ -0,0 +1,5 @@
+#!/bin/bash
+
+sudo add-apt-repository ppa:juju/stable -y
+sudo apt-get update
+sudo apt-get install amulet python3-requests juju-deployer -y
--- a/tests/14-juno
+++ b/tests/14-juno
@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+
+import amulet
+import requests
+import unittest
+
+class TestDeployment(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls):
+        cls.deployment = amulet.Deployment(series='trusty')
+        cls.deployment.load_bundle_file(bundle_file='files/plumgrid-gateway.yaml', deployment_name='test')
+        try:
+            cls.deployment.setup(timeout=2000)
+            cls.deployment.sentry.wait()
+        except amulet.helpers.TimeoutError:
+            amulet.raise_status(amulet.SKIP, msg="Environment wasn't stood up in time")
+        except:
+            raise
+    
+    def test_plumgrid_gateway_external_interface(self):
+        external_interface = self.deployment.services['plumgrid-gateway']['options']['external-interface']
+        if not external_interface:
+            amulet.raise_status(amulet.FAIL, msg='plumgrid external-interface parameter was not found.')
+        output, code = self.deployment.sentry['plumgrid-gateway/0'].run("ethtool {}".format(external_interface))
+        if code != 0:
+            amulet.raise_status(amulet.FAIL, msg='external interface not found on the host')
+
+    def test_plumgrid_gateway_started(self):
+        agent_state = self.deployment.sentry['plumgrid-gateway/0'].info['agent-state']
+        if agent_state != 'started':
+            amulet.raise_status(amulet.FAIL, msg='plumgrid gateway is not in a started state')
+
+    def test_plumgrid_gateway_relation(self):
+        relation = self.deployment.sentry['plumgrid-gateway/0'].relation('plumgrid-plugin', 'neutron-iovisor:plumgrid-plugin')
+        if not relation['private-address']:
+            amulet.raise_status(amulet.FAIL, msg='private address was not set in the plumgrid gateway relation')
+
+if __name__ == '__main__':
+    unittest.main()
--- a/tests/files/plumgrid-gateway.yaml
+++ b/tests/files/plumgrid-gateway.yaml
@ -0,0 +1,98 @@
+test:
+  series: 'trusty'
+  relations:
+  - - neutron-api
+    - neutron-iovisor
+  - - neutron-iovisor
+    - plumgrid-gateway
+  - - nova-cloud-controller
+    - nova-compute
+  - - glance
+    - nova-compute
+  - - nova-compute
+    - rabbitmq-server
+  - - mysql
+    - nova-compute
+  - - cinder
+    - nova-cloud-controller
+  - - nova-cloud-controller
+    - rabbitmq-server
+  - - glance
+    - nova-cloud-controller
+  - - keystone
+    - nova-cloud-controller
+  - - mysql
+    - nova-cloud-controller
+  - - neutron-api
+    - nova-cloud-controller
+  services:
+    cinder:
+      charm: cs:trusty/cinder
+      num_units: 1
+      options:
+        openstack-origin: cloud:trusty-juno
+      to: 'lxc:0'
+    glance:
+      charm: cs:trusty/glance
+      num_units: 1
+      options:
+        openstack-origin: cloud:trusty-juno
+      to: 'lxc:0'
+    keystone:
+      charm: cs:trusty/keystone
+      num_units: 1
+      options:
+        admin-password: plumgrid
+        openstack-origin: cloud:trusty-juno
+      to: 'lxc:0'
+    mysql:
+      charm: cs:trusty/mysql
+      num_units: 1
+      to: 'lxc:0'
+    neutron-api:
+      charm: cs:~juliann/trusty/neutron-api
+      num_units: 1
+      options:
+        install_keys: 'null'
+        install_sources: "deb http://10.22.24.200/debs ./"
+        neutron-plugin: "plumgrid"
+        neutron-security-groups: "true"
+        openstack-origin: "cloud:trusty-juno"
+        plumgrid-password: "plumgrid"
+        plumgrid-username: "plumgrid"
+        plumgrid-virtual-ip: "192.168.100.250"
+      to: 'lxc:0'
+    neutron-iovisor:
+      charm: cs:~juliann/trusty/neutron-iovisor
+      num_units: 1
+      options:
+        install_keys: 'null'
+        install_sources: "deb http://10.22.24.200/debs ./"
+      to: 'nova-compute'
+    plumgrid-gateway:
+      charm: cs:~juliann/trusty/plumgrid-gateway
+      num_units: 1
+      options:
+        external-interface: 'eth1'
+      to: 'nova-compute'
+    nova-cloud-controller:
+      charm: cs:trusty/nova-cloud-controller
+      num_units: 1
+      options:
+        console-access-protocol: novnc
+        network-manager: Neutron
+        openstack-origin: cloud:trusty-juno
+        quantum-security-groups: 'yes'
+      to: 'lxc:0'
+    nova-compute:
+      charm: cs:~juliann/trusty/nova-compute
+      num_units: 1
+      options:
+        enable-live-migration: true
+        enable-resize: true
+        migration-auth-type: ssh
+        openstack-origin: cloud:trusty-juno
+    rabbitmq-server:
+      charm: cs:trusty/rabbitmq-server
+      num_units: 1
+      to: 'lxc:0'
--- a/unit_tests/init.py
+++ b/unit_tests/init.py
@ -0,0 +1,4 @@
+import sys
+
+sys.path.append('actions/')
+sys.path.append('hooks/')
--- a/unit_tests/test_pg_gw_context.py
+++ b/unit_tests/test_pg_gw_context.py
@ -0,0 +1,82 @@
+from test_utils import CharmTestCase
+from mock import patch
+import pg_gw_context as context
+import charmhelpers
+
+TO_PATCH = [
+    #'_pg_dir_settings',
+    'config',
+    'get_unit_hostname',
+]
+
+
+def fake_context(settings):
+    def outer():
+        def inner():
+            return settings
+        return inner
+    return outer
+
+
+class PGGwContextTest(CharmTestCase):
+
+    def setUp(self):
+        super(PGGwContextTest, self).setUp(context, TO_PATCH)
+        self.config.side_effect = self.test_config.get
+        self.test_config.set('external-interface', 'eth1')
+
+    def tearDown(self):
+        super(PGGwContextTest, self).tearDown()
+
+    @patch.object(context.PGGwContext, '_ensure_packages')
+    @patch.object(charmhelpers.contrib.openstack.context, 'https')
+    @patch.object(charmhelpers.contrib.openstack.context, 'is_clustered')
+    @patch.object(charmhelpers.contrib.openstack.context, 'config')
+    @patch.object(charmhelpers.contrib.openstack.context, 'unit_private_ip')
+    @patch.object(charmhelpers.contrib.openstack.context, 'unit_get')
+    @patch.object(charmhelpers.contrib.openstack.context, 'config_flags_parser')
+    @patch.object(context.PGGwContext, '_save_flag_file')
+    @patch.object(context, '_pg_dir_settings')
+    @patch.object(charmhelpers.contrib.openstack.context, 'neutron_plugin_attribute')
+    def test_neutroncc_context_api_rel(self, _npa, _pg_dir_settings, _save_flag_file,
+                                       _config_flag, _unit_get, _unit_priv_ip, _config,
+                                       _is_clus, _https, _ens_pkgs):
+        def mock_npa(plugin, section, manager):
+            if section == "driver":
+                return "neutron.randomdriver"
+            if section == "config":
+                return "neutron.randomconfig"
+        config = {'external-interface': "eth1"}
+
+        def mock_config(key=None):
+            if key:
+                return config.get(key)
+
+            return config
+
+        self.maxDiff = None
+        self.config.side_effect = mock_config
+        _npa.side_effect = mock_npa
+        _unit_get.return_value = '192.168.100.201'
+        _unit_priv_ip.return_value = '192.168.100.201'
+        self.get_unit_hostname.return_value = 'node0'
+        _is_clus.return_value = False
+        _config_flag.return_value = False
+        _pg_dir_settings.return_value = {'pg_dir_ip': '192.168.100.201'}
+        napi_ctxt = context.PGGwContext()
+        expect = {
+            'ext_interface': "eth1",
+            'config': 'neutron.randomconfig',
+            'core_plugin': 'neutron.randomdriver',
+            'local_ip': '192.168.100.201',
+            'network_manager': 'neutron',
+            'neutron_plugin': 'plumgrid',
+            'neutron_security_groups': None,
+            'neutron_url': 'https://192.168.100.201:9696',
+            'pg_hostname': 'node0',
+            'interface': 'juju-br0',
+            'label': 'node0',
+            'fabric_mode': 'host',
+            'neutron_alchemy_flags': False,
+        }
+        self.assertEquals(expect, napi_ctxt())
--- a/unit_tests/test_pg_gw_hooks.py
+++ b/unit_tests/test_pg_gw_hooks.py
@ -0,0 +1,68 @@
+from mock import MagicMock, patch
+
+from test_utils import CharmTestCase
+
+with patch('charmhelpers.core.hookenv.config') as config:
+    config.return_value = 'neutron'
+    import pg_gw_utils as utils
+
+_reg = utils.register_configs
+_map = utils.restart_map
+
+utils.register_configs = MagicMock()
+utils.restart_map = MagicMock()
+
+import pg_gw_hooks as hooks
+
+utils.register_configs = _reg
+utils.restart_map = _map
+
+TO_PATCH = [
+    #'apt_update',
+    #'apt_install',
+    #'apt_purge',
+    #'config',
+    'CONFIGS',
+    #'determine_packages',
+    #'determine_dvr_packages',
+    #'get_shared_secret',
+    #'git_install',
+    'log',
+    #'relation_ids',
+    #'relation_set',
+    #'configure_ovs',
+    #'use_dvr',
+    'ensure_files',
+    'stop_pg',
+    'restart_pg',
+]
+NEUTRON_CONF_DIR = "/etc/neutron"
+
+NEUTRON_CONF = '%s/neutron.conf' % NEUTRON_CONF_DIR
+
+
+class PGGwHooksTests(CharmTestCase):
+
+    def setUp(self):
+        super(PGGwHooksTests, self).setUp(hooks, TO_PATCH)
+
+        #self.config.side_effect = self.test_config.get
+        hooks.hooks._config_save = False
+
+    def _call_hook(self, hookname):
+        hooks.hooks.execute([
+            'hooks/{}'.format(hookname)])
+
+    def test_install_hook(self):
+        self._call_hook('install')
+        self.ensure_files.assert_called_with()
+
+    def test_plumgrid_edge_joined(self):
+        self._call_hook('plumgrid-plugin-relation-joined')
+        self.ensure_files.assert_called_with()
+        self.CONFIGS.write_all.assert_called_with()
+        self.restart_pg.assert_called_with()
+
+    def test_stop(self):
+        self._call_hook('stop')
+        self.stop_pg.assert_called_with()
--- a/unit_tests/test_pg_gw_utils.py
+++ b/unit_tests/test_pg_gw_utils.py
@ -0,0 +1,79 @@
+from mock import MagicMock
+from collections import OrderedDict
+import charmhelpers.contrib.openstack.templating as templating
+
+templating.OSConfigRenderer = MagicMock()
+
+import pg_gw_utils as nutils
+
+from test_utils import (
+    CharmTestCase,
+)
+import charmhelpers.core.hookenv as hookenv
+
+
+TO_PATCH = [
+    'os_release',
+    'neutron_plugin_attribute',
+]
+
+
+class DummyContext():
+
+    def __init__(self, return_value):
+        self.return_value = return_value
+
+    def __call__(self):
+        return self.return_value
+
+
+class TestPGGwUtils(CharmTestCase):
+
+    def setUp(self):
+        super(TestPGGwUtils, self).setUp(nutils, TO_PATCH)
+        #self.config.side_effect = self.test_config.get
+
+    def tearDown(self):
+        # Reset cached cache
+        hookenv.cache = {}
+
+    def test_register_configs(self):
+        class _mock_OSConfigRenderer():
+            def __init__(self, templates_dir=None, openstack_release=None):
+                self.configs = []
+                self.ctxts = []
+
+            def register(self, config, ctxt):
+                self.configs.append(config)
+                self.ctxts.append(ctxt)
+
+        self.os_release.return_value = 'trusty'
+        templating.OSConfigRenderer.side_effect = _mock_OSConfigRenderer
+        _regconfs = nutils.register_configs()
+        confs = ['/var/lib/libvirt/filesystems/plumgrid/opt/pg/etc/plumgrid.conf',
+                 '/var/lib/libvirt/filesystems/plumgrid-data/conf/etc/hostname',
+                 '/var/lib/libvirt/filesystems/plumgrid-data/conf/etc/hosts',
+                 '/var/lib/libvirt/filesystems/plumgrid-data/conf/pg/ifcs.conf',
+                 '/etc/nova/rootwrap.d/network.filters']
+        self.assertItemsEqual(_regconfs.configs, confs)
+
+    def test_resource_map(self):
+        _map = nutils.resource_map()
+        svcs = ['plumgrid']
+        confs = [nutils.PG_CONF]
+        [self.assertIn(q_conf, _map.keys()) for q_conf in confs]
+        self.assertEqual(_map[nutils.PG_CONF]['services'], svcs)
+
+    def test_restart_map(self):
+        _restart_map = nutils.restart_map()
+        expect = OrderedDict([
+            (nutils.PG_CONF, ['plumgrid']),
+            (nutils.PGHN_CONF, ['plumgrid']),
+            (nutils.PGHS_CONF, ['plumgrid']),
+            (nutils.PGIFCS_CONF, []),
+            (nutils.FILTERS_CONF, []),
+        ])
+        self.assertEqual(expect, _restart_map)
+        for item in _restart_map:
+            self.assertTrue(item in _restart_map)
+            self.assertTrue(expect[item] == _restart_map[item])
--- a/unit_tests/test_utils.py
+++ b/unit_tests/test_utils.py
@ -0,0 +1,121 @@
+import logging
+import unittest
+import os
+import yaml
+
+from contextlib import contextmanager
+from mock import patch, MagicMock
+
+
+def load_config():
+    '''
+    Walk backwords from __file__ looking for config.yaml, load and return the
+    'options' section'
+    '''
+    config = None
+    f = __file__
+    while config is None:
+        d = os.path.dirname(f)
+        if os.path.isfile(os.path.join(d, 'config.yaml')):
+            config = os.path.join(d, 'config.yaml')
+            break
+        f = d
+
+    if not config:
+        logging.error('Could not find config.yaml in any parent directory '
+                      'of %s. ' % file)
+        raise Exception
+
+    return yaml.safe_load(open(config).read())['options']
+
+
+def get_default_config():
+    '''
+    Load default charm config from config.yaml return as a dict.
+    If no default is set in config.yaml, its value is None.
+    '''
+    default_config = {}
+    config = load_config()
+    for k, v in config.iteritems():
+        if 'default' in v:
+            default_config[k] = v['default']
+        else:
+            default_config[k] = None
+    return default_config
+
+
+class CharmTestCase(unittest.TestCase):
+
+    def setUp(self, obj, patches):
+        super(CharmTestCase, self).setUp()
+        self.patches = patches
+        self.obj = obj
+        self.test_config = TestConfig()
+        self.test_relation = TestRelation()
+        self.patch_all()
+
+    def patch(self, method):
+        _m = patch.object(self.obj, method)
+        mock = _m.start()
+        self.addCleanup(_m.stop)
+        return mock
+
+    def patch_all(self):
+        for method in self.patches:
+            setattr(self, method, self.patch(method))
+
+
+class TestConfig(object):
+
+    def __init__(self):
+        self.config = get_default_config()
+
+    def get(self, attr=None):
+        if not attr:
+            return self.get_all()
+        try:
+            return self.config[attr]
+        except KeyError:
+            return None
+
+    def get_all(self):
+        return self.config
+
+    def set(self, attr, value):
+            if attr not in self.config:
+                raise KeyError
+            self.config[attr] = value
+
+
+class TestRelation(object):
+
+    def __init__(self, relation_data={}):
+        self.relation_data = relation_data
+
+    def set(self, relation_data):
+        self.relation_data = relation_data
+
+    def get(self, attribute=None, unit=None, rid=None):
+        if attribute is None:
+            return self.relation_data
+        elif attribute in self.relation_data:
+            return self.relation_data[attribute]
+        return None
+
+
+@contextmanager
+def patch_open():
+    '''Patch open() to allow mocking both open() itself and the file that is
+    yielded.
+
+    Yields the mock for "open" and "file", respectively.'''
+    mock_open = MagicMock(spec=open)
+    mock_file = MagicMock(spec=file)
+
+    @contextmanager
+    def stub_open(*args, **kwargs):
+        mock_open(*args, **kwargs)
+        yield mock_file
+
+    with patch('__builtin__.open', stub_open):
+        yield mock_open, mock_file