Port in config reading from shade

8 files changed, 346 insertions, 14 deletions

diff --git a/README.rst b/README.rst
index cf2315d..6332f83 100644
--- a/README.rst
+++ b/README.rst
@@ -2,14 +2,111 @@
 os-client-config
 ===============================
 
-OpenStack Client Configuation Library
+os-client-config is a library for collecting client configuration for
+using an OpenStack cloud in a consistent and comprehensive manner. It
+will find cloud config for as few as 1 cloud and as many as you want to
+put in a config file. It will read environment variables and config files,
+and it also contains some vendor specific default values so that you don't
+have to know extra info to use OpenStack
+
+Environment Variables
+---------------------
+
+os-client-config honors all of the normal `OS_*` variables. It does not
+provide backwards compatibility to service-specific variables such as
+`NOVA_USERNAME`.
+
+If you have environment variables and no config files, os-client-config
+will produce a cloud config object named "openstack" containing your
+values from the environment.
+
+Service specific settings, like the nova service type, are set with the
+default service type as a prefix. For instance, to set a special service_type
+for trove (because you're using Rackspace) set:
+::
+
+  export OS_DATABASE_SERVICE_TYPE=rax:database
+
+Config Files
+------------
+
+os-client-config will for a file called clouds.yaml in the following locations:
+* Current Directory
+* ~/.config/openstack
+* /etc/openstack
+
+The keys are all of the keys you'd expect from `OS_*` - except lower case
+and without the OS prefix. So, username is set with `username`.
+
+Service specific settings, like the nova service type, are set with the
+default service type as a prefix. For instance, to set a special service_type
+for trove (because you're using Rackspace) set:
+::
+
+  database_service_type: 'rax:database'
+
+An example config file is probably helpful:
+::
+
+  clouds:
+    mordred:
+      cloud: hp
+      username: mordred@inaugust.com
+      password: XXXXXXXXX
+      project_id: mordred@inaugust.com
+      region_name: region-b.geo-1
+    monty:
+      auth_url: https://region-b.geo-1.identity.hpcloudsvc.com:35357/v2.0
+      username: monty.taylor@hp.com
+      password: XXXXXXXX
+      project_id: monty.taylor@hp.com-default-tenant
+      region_name: region-b.geo-1
+    infra:
+      cloud: rackspace
+      username: openstackci
+      password: XXXXXXXX
+      project_id: 610275
+      region_name: DFW,ORD,IAD
+
+You may note a few things. First, since auth_url settings are silly
+and embarrasingly ugly, known cloud vendors are included and may be referrenced
+by name. One of the benefits of that is that auth_url isn't the only thing
+the vendor defaults contain. For instance, since Rackspace is broken and lists
+`rax:database` as the service type for trove, os-client-config knows that
+so that you don't have to.
+
+Also, region_name can be a list of regions. When you call get_all_clouds,
+you'll get a cloud config object for each cloud/region combo.
+
+Usage
+-----
+
+The simplest and least useful thing you can do is:
+::
+
+  python -m os_client_config.config
+
+Which will print out whatever if finds for your config. If you want to use
+it from python, which is much more likely what you want to do, things like:
+
+Get a named cloud.
+::
+
+  import os_client_config
+
+  cloud_config = os_client_config.OpenStackConfig().get_one_cloud(
+      'hp', 'region-b.geo-1')
+  print(cloud_config.name, cloud_config.region, cloud_config.config)
+
+Or, get all of the clouds.
+::
+  import os_client_config
+
+  cloud_config = os_client_config.OpenStackConfig().get_all_clouds()
+  for cloud in cloud_config:
+      print(cloud.name, cloud.region, cloud.config)
 
 * Free software: Apache license
 * Documentation: http://docs.openstack.org/developer/os-client-config
 * Source: http://git.openstack.org/cgit/openstack/os-client-config
 * Bugs: http://bugs.launchpad.net/os-client-config
-
-Features
---------
-
-* TODO
\ No newline at end of file
diff --git a/os_client_config/__init__.py b/os_client_config/__init__.py
index 26bdf7e..d5fd36c 100644
--- a/os_client_config/__init__.py
+++ b/os_client_config/__init__.py
@@ -1,5 +1,5 @@
-# -*- coding: utf-8 -*-
-
+# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
+#
 # 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
@@ -12,8 +12,4 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import pbr.version
-
-
-__version__ = pbr.version.VersionInfo(
-    'os_client_config').version_string()
\ No newline at end of file
+from os_client_config.config import OpenStackConfig  # noqa
diff --git a/os_client_config/cloud_config.py b/os_client_config/cloud_config.py
new file mode 100644
index 0000000..d0c932f
--- /dev/null
+++ b/os_client_config/cloud_config.py
@@ -0,0 +1,20 @@
+# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
+#
+# 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.
+
+
+class CloudConfig(object):
+    def __init__(self, name, region, config):
+        self.name = name
+        self.region = region
+        self.config = config
diff --git a/os_client_config/config.py b/os_client_config/config.py
new file mode 100644
index 0000000..1742b5b
--- /dev/null
+++ b/os_client_config/config.py
@@ -0,0 +1,150 @@
+# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
+#
+# 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 os
+
+import yaml
+
+from os_client_config import cloud_config
+from os_client_config import defaults_dict
+from os_client_config import exceptions
+from os_client_config import vendors
+
+CONFIG_HOME = os.path.join(os.path.expanduser(
+    os.environ.get('XDG_CONFIG_HOME', os.path.join('~', '.config'))),
+    'openstack')
+CONFIG_SEARCH_PATH = [os.getcwd(), CONFIG_HOME, '/etc/openstack']
+CONFIG_FILES = [
+    os.path.join(d, 'clouds.yaml') for d in CONFIG_SEARCH_PATH]
+BOOL_KEYS = ('insecure', 'cache')
+REQUIRED_VALUES = ('auth_url', 'username', 'password', 'project_id')
+SERVICES = (
+    'compute', 'identity', 'network', 'metering', 'object-store',
+    'volume', 'dns', 'image', 'database')
+
+
+def get_boolean(value):
+    if value.lower() == 'true':
+        return True
+    return False
+
+
+class OpenStackConfig(object):
+
+    def __init__(self, config_files=None):
+        self._config_files = config_files or CONFIG_FILES
+
+        defaults = defaults_dict.DefaultsDict()
+        defaults.add('username')
+        defaults.add('user_domain_name')
+        defaults.add('password')
+        defaults.add('project_id', defaults['username'], also='tenant_name')
+        defaults.add('project_domain_name')
+        defaults.add('auth_url')
+        defaults.add('region_name')
+        defaults.add('cache', 'false')
+        defaults.add('auth_token')
+        defaults.add('insecure', 'false')
+        defaults.add('cacert')
+
+        for service in SERVICES:
+            defaults.add('service_name', prefix=service)
+            defaults.add('service_type', prefix=service)
+            defaults.add('endpoint_type', prefix=service)
+            defaults.add('endpoint', prefix=service)
+        self.defaults = defaults
+
+        # use a config file if it exists where expected
+        self.cloud_config = self._load_config_file()
+        if not self.cloud_config:
+            self.cloud_config = dict(
+                clouds=dict(openstack=dict(self.defaults)))
+
+    @classmethod
+    def get_services(klass):
+        return SERVICES
+
+    def _load_config_file(self):
+        for path in self._config_files:
+            if os.path.exists(path):
+                return yaml.load(open(path, 'r'))
+
+    def _get_regions(self, cloud):
+        return self.cloud_config['clouds'][cloud]['region_name']
+
+    def _get_region(self, cloud):
+        return self._get_regions(cloud).split(',')[0]
+
+    def _get_cloud_sections(self):
+        return self.cloud_config['clouds'].keys()
+
+    def _get_base_cloud_config(self, name):
+        cloud = dict()
+        if name in self.cloud_config['clouds']:
+            our_cloud = self.cloud_config['clouds'][name]
+        else:
+            our_cloud = dict()
+
+        # yes, I know the next line looks silly
+        if 'cloud' in our_cloud:
+            cloud.update(vendors.CLOUD_DEFAULTS[our_cloud['cloud']])
+
+        cloud.update(self.defaults)
+        cloud.update(our_cloud)
+        if 'cloud' in cloud:
+            del cloud['cloud']
+        return cloud
+
+    def get_all_clouds(self):
+
+        clouds = []
+
+        for cloud in self._get_cloud_sections():
+            for region in self._get_regions(cloud).split(','):
+                clouds.append(self.get_one_cloud(cloud, region))
+        return clouds
+
+    def get_one_cloud(self, name='openstack', region=None):
+
+        if not region:
+            region = self._get_region(name)
+
+        config = self._get_base_cloud_config(name)
+        config['region_name'] = region
+
+        for key in BOOL_KEYS:
+            if key in config:
+                config[key] = get_boolean(config[key])
+
+        for key in REQUIRED_VALUES:
+            if key not in config or not config[key]:
+                raise exceptions.OpenStackConfigException(
+                    'Unable to find full auth information for cloud {name} in'
+                    ' config files {files}'
+                    ' or environment variables.'.format(
+                        name=name, files=','.join(self._config_files)))
+
+        # If any of the defaults reference other values, we need to expand
+        for (key, value) in config.items():
+            if hasattr(value, 'format'):
+                config[key] = value.format(**config)
+
+        return cloud_config.CloudConfig(
+            name=name, region=region, config=config)
+
+if __name__ == '__main__':
+    config = OpenStackConfig().get_all_clouds()
+    for cloud in config:
+        print(cloud.name, cloud.region, cloud.config)
diff --git a/os_client_config/defaults_dict.py b/os_client_config/defaults_dict.py
new file mode 100644
index 0000000..43de77b
--- /dev/null
+++ b/os_client_config/defaults_dict.py
@@ -0,0 +1,27 @@
+# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
+#
+# 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 os
+
+
+class DefaultsDict(dict):
+
+    def add(self, key, default_value=None, also=None, prefix=None):
+        if prefix:
+            key = '%s_%s' % (prefix.replace('-', '_'), key)
+        if also:
+            value = os.environ.get(also, default_value)
+        value = os.environ.get('OS_%s' % key.upper(), default_value)
+        if value is not None:
+            self.__setitem__(key, value)
diff --git a/os_client_config/exceptions.py b/os_client_config/exceptions.py
new file mode 100644
index 0000000..ab78dc2
--- /dev/null
+++ b/os_client_config/exceptions.py
@@ -0,0 +1,17 @@
+# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
+#
+# 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.
+
+
+class OpenStackConfigException(Exception):
+    """Something went wrong with parsing your OpenStack Config."""
diff --git a/os_client_config/vendors.py b/os_client_config/vendors.py
new file mode 100644
index 0000000..d1b29a5
--- /dev/null
+++ b/os_client_config/vendors.py
@@ -0,0 +1,25 @@
+# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
+#
+# 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.
+
+CLOUD_DEFAULTS = dict(
+    hp=dict(
+        auth_url='https://region-b.geo-1.identity.hpcloudsvc.com:35357/v2.0',
+        region_name='region-b.geo-1',
+    ),
+    rackspace=dict(
+        auth_url='https://identity.api.rackspacecloud.com/v2.0/',
+        image_endpoint='https://{region_name}.images.api.rackspacecloud.com/',
+        database_service_type='rax:database',
+    )
+)
diff --git a/setup.py b/setup.py
index 7eeb36b..70c2b3f 100755
--- a/setup.py
+++ b/setup.py
@@ -19,4 +19,4 @@ import setuptools
 
 setuptools.setup(
     setup_requires=['pbr'],
-    pbr=True)
\ No newline at end of file
+    pbr=True)