1:41 p.m.
From: Aline Manera <alinefm(a)br.ibm.com>
Resource(), Collection() and AsyncCollection classes are base for all Kimchi
resources.
Move them to a separated file as they should not be changed with high frequency
Signed-off-by: Aline Manera <alinefm(a)br.ibm.com>
---
Makefile.am | 1 +
src/kimchi/control/base.py | 290 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 291 insertions(+)
create mode 100644 src/kimchi/control/base.py
diff --git a/Makefile.am b/Makefile.am
index 65b39b8..997d4cc 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -45,6 +45,7 @@ PEP8_WHITELIST = \
src/kimchi/disks.py \
src/kimchi/root.py \
src/kimchi/server.py \
+ src/kimchi/control/base.py \
src/kimchi/control/utils.py \
plugins/__init__.py \
plugins/sample/__init__.py \
diff --git a/src/kimchi/control/base.py b/src/kimchi/control/base.py
new file mode 100644
index 0000000..22452fc
--- /dev/null
+++ b/src/kimchi/control/base.py
@@ -0,0 +1,290 @@
+#
+# Project Kimchi
+#
+# Copyright IBM, Corp. 2013
+#
+# Authors:
+# Adam Litke <agl(a)linux.vnet.ibm.com>
+# Aline Manera <alinefm(a)linix.vnet.ibm.com>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library 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 this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+import cherrypy
+import urllib2
+
+
+import kimchi.template
+from kimchi.control.utils import get_class_name, internal_redirect, model_fn
+from kimchi.control.utils import parse_request, validate_method
+from kimchi.control.utils import validate_params
+from kimchi.exception import InvalidOperation, InvalidParameter
+from kimchi.exception import MissingParameter, NotFoundError, OperationFailed
+
+
+class Resource(object):
+ """
+ A Resource represents a single entity in the API (such as a Virtual
+ Machine)
+
+ To create new Resource types, subclass this and change the following things
+ in the child class:
+
+ - If the Resource requires more than one identifier set self.model_args as
+ appropriate. This should only be necessary if this Resource is logically
+ nested. For example: A Storage Volume belongs to a Storage Pool so the
+ Storage Volume would set model args to (pool_ident, volume_ident).
+
+ - Implement the base operations of 'lookup' and 'delete' in the
model(s).
+
+ - Set the 'data' property to a JSON-serializable representation of the
+ Resource.
+ """
+ def __init__(self, model, ident=None):
+ self.model = model
+ self.ident = ident
+ self.model_args = (ident,)
+ self.update_params = []
+
+ def generate_action_handler(self, instance, action_name, action_args=None):
+ def wrapper(*args, **kwargs):
+ validate_method(('POST'))
+ try:
+ model_args = list(instance.model_args)
+ if action_args is not None:
+ model_args.extend(parse_request()[key]
+ for key in action_args)
+ fn = getattr(instance.model, model_fn(instance, action_name))
+ fn(*model_args)
+ uri_params = tuple(instance.model_args)
+ raise internal_redirect(instance.uri_fmt % uri_params)
+ except MissingParameter, param:
+ error = "Missing parameter: '%s'" % param
+ raise cherrypy.HTTPError(400, error)
+ except InvalidParameter, param:
+ error = "Invalid parameter: '%s'" % param
+ raise cherrypy.HTTPError(400, error)
+ except InvalidOperation, msg:
+ raise cherrypy.HTTPError(400, "Invalid operation: '%s'"
% msg)
+ except OperationFailed, msg:
+ raise cherrypy.HTTPError(500, "Operation Failed: '%s'"
% msg)
+ except NotFoundError, msg:
+ raise cherrypy.HTTPError(404, "Not found: '%s'" % msg)
+
+ wrapper.__name__ = action_name
+ wrapper.exposed = True
+ return wrapper
+
+ def lookup(self):
+ try:
+ lookup = getattr(self.model, model_fn(self, 'lookup'))
+ self.info = lookup(*self.model_args)
+ except AttributeError:
+ self.info = {}
+
+ def delete(self):
+ try:
+ fn = getattr(self.model, model_fn(self, 'delete'))
+ fn(*self.model_args)
+ cherrypy.response.status = 204
+ except AttributeError:
+ error = "Delete is not allowed for %s" % get_class_name(self)
+ raise cherrypy.HTTPError(405, error)
+ except OperationFailed, msg:
+ raise cherrypy.HTTPError(500, "Operation Failed: '%s'" %
msg)
+ except InvalidOperation, msg:
+ raise cherrypy.HTTPError(400, "Invalid operation: '%s'" %
msg)
+
+ @cherrypy.expose
+ def index(self):
+ method = validate_method(('GET', 'DELETE', 'PUT'))
+ if method == 'GET':
+ try:
+ return self.get()
+ except NotFoundError, msg:
+ raise cherrypy.HTTPError(404, "Not found: '%s'" % msg)
+ except InvalidOperation, msg:
+ raise cherrypy.HTTPError(400, "Invalid operation: '%s'"
% msg)
+ except OperationFailed, msg:
+ raise cherrypy.HTTPError(406, "Operation failed: '%s'"
% msg)
+ elif method == 'DELETE':
+ try:
+ return self.delete()
+ except NotFoundError, msg:
+ raise cherrypy.HTTPError(404, "Not found: '%s'" % msg)
+ elif method == 'PUT':
+ try:
+ return self.update()
+ except InvalidParameter, msg:
+ raise cherrypy.HTTPError(400, "Invalid parameter: '%s'"
% msg)
+ except InvalidOperation, msg:
+ raise cherrypy.HTTPError(400, "Invalid operation: '%s'"
% msg)
+ except NotFoundError, msg:
+ raise cherrypy.HTTPError(404, "Not found: '%s'" % msg)
+
+ def update(self):
+ try:
+ update = getattr(self.model, model_fn(self, 'update'))
+ except AttributeError:
+ error = "%s does not implement update method"
+ raise cherrypy.HTTPError(405, error % get_class_name(self))
+
+ params = parse_request()
+ validate_params(params, self, 'update')
+
+ if self.update_params is not None:
+ invalids = [v for v in params.keys() if
+ v not in self.update_params]
+ if invalids:
+ error = "%s are not allowed to be updated" % invalids
+ raise cherrypy.HTTPError(405, error)
+
+ ident = update(self.ident, params)
+ if ident != self.ident:
+ uri_params = list(self.model_args[:-1])
+ uri_params += [urllib2.quote(ident.encode('utf8'))]
+ raise cherrypy.HTTPRedirect(self.uri_fmt % tuple(uri_params), 303)
+
+ return self.get()
+
+ def get(self):
+ self.lookup()
+ return kimchi.template.render(get_class_name(self), self.data)
+
+ @property
+ def data(self):
+ """
+ Override this in inherited classes to provide the Resource
+ representation as a python dictionary.
+ """
+ return {}
+
+
+class Collection(object):
+ """
+ A Collection is a container for Resource objects. To create a new
+ Collection type, subclass this and make the following changes to the child
+ class:
+
+ - Set self.resource to the type of Resource that this Collection contains
+
+ - Set self.resource_args. This can remain an empty list if the Resources
+ can be initialized with only one identifier. Otherwise, include
+ additional values as needed (eg. to identify a parent resource).
+
+ - Set self.model_args. Similar to above, this is needed only if the model
+ needs additional information to identify this Collection.
+
+ - Implement the base operations of 'create' and 'get_list' in the
model.
+ """
+ def __init__(self, model):
+ self.model = model
+ self.resource = Resource
+ self.resource_args = []
+ self.model_args = []
+
+ def create(self, *args):
+ try:
+ create = getattr(self.model, model_fn(self, 'create'))
+ except AttributeError:
+ error = 'Create is not allowed for %s' % get_class_name(self)
+ raise cherrypy.HTTPError(405, error)
+
+ params = parse_request()
+ validate_params(params, self, 'create')
+ args = self.model_args + [params]
+ name = create(*args)
+ cherrypy.response.status = 201
+ args = self.resource_args + [name]
+ res = self.resource(self.model, *args)
+
+ return res.get()
+
+ def _get_resources(self):
+ try:
+ get_list = getattr(self.model, model_fn(self, 'get_list'))
+ idents = get_list(*self.model_args)
+ res_list = []
+ for ident in idents:
+ # internal text, get_list changes ident to unicode for sorted
+ args = self.resource_args + [ident]
+ res = self.resource(self.model, *args)
+ res.lookup()
+ res_list.append(res)
+ return res_list
+ except AttributeError:
+ return []
+
+ def _cp_dispatch(self, vpath):
+ if vpath:
+ ident = vpath.pop(0)
+ # incoming text, from URL, is not unicode, need decode
+ args = self.resource_args + [ident.decode("utf-8")]
+ return self.resource(self.model, *args)
+
+ def get(self):
+ resources = self._get_resources()
+ data = []
+ for res in resources:
+ data.append(res.data)
+ return kimchi.template.render(get_class_name(self), data)
+
+ @cherrypy.expose
+ def index(self, *args):
+ method = validate_method(('GET', 'POST'))
+ if method == 'GET':
+ try:
+ return self.get()
+ except InvalidOperation, param:
+ error = "Invalid operation: '%s'" % param
+ raise cherrypy.HTTPError(400, error)
+ except NotFoundError, param:
+ raise cherrypy.HTTPError(404, "Not found: '%s'" %
param)
+
+ elif method == 'POST':
+ try:
+ return self.create(*args)
+ except MissingParameter, param:
+ error = "Missing parameter: '%s'" % param
+ raise cherrypy.HTTPError(400, error)
+ except InvalidParameter, param:
+ error = "Invalid parameter: '%s'" % param
+ raise cherrypy.HTTPError(400, error)
+ except OperationFailed, param:
+ raise cherrypy.HTTPError(500, "Operation Failed: '%s'"
% param)
+ except InvalidOperation, param:
+ error = "Invalid operation: '%s'" % param
+ raise cherrypy.HTTPError(400, error)
+ except NotFoundError, param:
+ raise cherrypy.HTTPError(404, "Not found: '%s'" %
param)
+
+
+class AsyncCollection(Collection):
+ """
+ A Collection to create it's resource by asynchronous task
+ """
+ def __init__(self, model):
+ super(AsyncCollection, self).__init__(model)
+
+ def create(self, *args):
+ try:
+ create = getattr(self.model, model_fn(self, 'create'))
+ except AttributeError:
+ raise cherrypy.HTTPError(405,
+ 'Create is not allowed for %s' % get_class_name(self))
+ params = parse_request()
+ args = self.model_args + [params]
+ task = create(*args)
+ cherrypy.response.status = 202
+ return kimchi.template.render("Task", task)
--
1.7.10.4