482 lines
17 KiB
Python
482 lines
17 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from copy import deepcopy
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import datetime
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import webob
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import json
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import urlparse
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import httplib
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import eventlet
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from heat import manager
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from heat.db import api as db_api
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from heat.common import config
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from heat.common import utils as heat_utils
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from heat.common import context as ctxtlib
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from heat.engine import api
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from heat.engine import parser
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from heat.engine import resources
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from heat.engine import watchrule
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from heat.engine import auth
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from heat.openstack.common import cfg
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from heat.openstack.common import timeutils
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from heat.openstack.common import log as logging
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from novaclient.v1_1 import client
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from novaclient.exceptions import BadRequest
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from novaclient.exceptions import NotFound
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from novaclient.exceptions import AuthorizationFailure
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logger = logging.getLogger('heat.engine.manager')
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greenpool = eventlet.GreenPool()
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class EngineManager(manager.Manager):
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"""
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Manages the running instances from creation to destruction.
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All the methods in here are called from the RPC backend. This is
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all done dynamically so if a call is made via RPC that does not
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have a corresponding method here, an exception will be thrown when
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it attempts to call into this class. Arguments to these methods
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are also dynamically added and will be named as keyword arguments
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by the RPC caller.
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"""
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def __init__(self, *args, **kwargs):
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"""Load configuration options and connect to the hypervisor."""
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pass
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def show_stack(self, context, stack_name, params):
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"""
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The show_stack method returns the attributes of one stack.
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arg1 -> RPC context.
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arg2 -> Name of the stack you want to see, or None to see all
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arg3 -> Dict of http request parameters passed in from API side.
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"""
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auth.authenticate(context)
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if stack_name is not None:
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s = db_api.stack_get_by_name(context, stack_name)
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if s:
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stacks = [s]
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else:
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raise AttributeError('Unknown stack name')
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else:
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stacks = db_api.stack_get_by_tenant(context) or []
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def format_stack_detail(s):
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stack = parser.Stack.load(context, s.id)
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return api.format_stack(stack)
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return {'stacks': [format_stack_detail(s) for s in stacks]}
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def create_stack(self, context, stack_name, template, params, args):
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"""
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The create_stack method creates a new stack using the template
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provided.
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Note that at this stage the template has already been fetched from the
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heat-api process if using a template-url.
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arg1 -> RPC context.
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arg2 -> Name of the stack you want to create.
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arg3 -> Template of stack you want to create.
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arg4 -> Stack Input Params
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arg4 -> Request parameters/args passed from API
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"""
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logger.info('template is %s' % template)
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auth.authenticate(context)
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if db_api.stack_get_by_name(None, stack_name):
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return {'Error': 'Stack already exists with that name.'}
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tmpl = parser.Template(template)
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# Extract the template parameters, and any common query parameters
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template_params = parser.Parameters(stack_name, tmpl, params)
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common_params = api.extract_args(args)
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stack = parser.Stack(context, stack_name, tmpl, template_params,
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**common_params)
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response = stack.validate()
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if response['Description'] != 'Successfully validated':
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return response
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stack_id = stack.store()
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greenpool.spawn_n(stack.create)
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return {'StackName': stack.name, 'StackId': stack.id}
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def update_stack(self, context, stack_name, template, params, args):
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"""
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The update_stack method updates an existing stack based on the
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provided template and parameters.
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Note that at this stage the template has already been fetched from the
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heat-api process if using a template-url.
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arg1 -> RPC context.
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arg2 -> Name of the stack you want to create.
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arg3 -> Template of stack you want to create.
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arg4 -> Stack Input Params
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arg4 -> Request parameters/args passed from API
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"""
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logger.info('template is %s' % template)
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auth.authenticate(context)
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# Get the database representation of the existing stack
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db_stack = db_api.stack_get_by_name(None, stack_name)
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if not db_stack:
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return {'Error': 'No stack exists with that name.'}
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current_stack = parser.Stack.load(context, db_stack.id)
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# Now parse the template and any parameters for the updated
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# stack definition.
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tmpl = parser.Template(template)
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template_params = parser.Parameters(stack_name, tmpl, params)
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common_params = api.extract_args(args)
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updated_stack = parser.Stack(context, stack_name, tmpl,
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template_params, **common_params)
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response = updated_stack.validate()
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if response['Description'] != 'Successfully validated':
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return response
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greenpool.spawn_n(current_stack.update, updated_stack)
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return {'StackName': current_stack.name, 'StackId': current_stack.id}
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def validate_template(self, context, template, params):
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"""
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The validate_template method uses the stack parser to check
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the validity of a template.
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arg1 -> RPC context.
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arg3 -> Template of stack you want to create.
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arg4 -> Params passed from API.
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"""
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auth.authenticate(context)
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logger.info('validate_template')
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if template is None:
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msg = _("No Template provided.")
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return webob.exc.HTTPBadRequest(explanation=msg)
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tmpl = parser.Template(template)
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resources = template.get('Resources', [])
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if not resources:
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return {'Error': 'At least one Resources member must be defined.'}
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for res in resources.values():
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if not res.get('Type'):
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return {'Error':
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'Every Resources object must contain a Type member.'}
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parameters = []
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for param_key, param in template.get('Parameters', {}).items():
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parameters.append({
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'NoEcho': param.get('NoEcho', 'false'),
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'ParameterKey': param_key,
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'Description': param.get('Description', '')
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})
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result = {
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'Description': template.get('Description', ''),
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'Parameters': parameters,
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}
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return {'ValidateTemplateResult': result}
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def get_template(self, context, stack_name, params):
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"""
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Get the template.
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arg1 -> RPC context.
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arg2 -> Name of the stack you want to see.
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arg3 -> Dict of http request parameters passed in from API side.
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"""
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auth.authenticate(context)
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s = db_api.stack_get_by_name(context, stack_name)
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if s:
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return s.raw_template.template
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return None
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def delete_stack(self, context, stack_name, params):
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"""
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The delete_stack method deletes a given stack.
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arg1 -> RPC context.
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arg2 -> Name of the stack you want to delete.
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arg3 -> Params passed from API.
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"""
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auth.authenticate(context)
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st = db_api.stack_get_by_name(context, stack_name)
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if not st:
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raise AttributeError('Unknown stack name')
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logger.info('deleting stack %s' % stack_name)
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stack = parser.Stack.load(context, st.id)
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greenpool.spawn_n(stack.delete)
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return None
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def list_events(self, context, stack_name, params):
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"""
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The list_events method lists all events associated with a given stack.
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arg1 -> RPC context.
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arg2 -> Name of the stack you want to get events for.
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arg3 -> Params passed from API.
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"""
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auth.authenticate(context)
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if stack_name is not None:
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st = db_api.stack_get_by_name(context, stack_name)
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if not st:
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raise AttributeError('Unknown stack name')
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events = db_api.event_get_all_by_stack(context, st.id)
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else:
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events = db_api.event_get_all_by_tenant(context)
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return {'events': [api.format_event(e) for e in events]}
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def event_create(self, context, event):
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auth.authenticate(context)
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stack_name = event['stack']
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resource_name = event['resource']
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stack = db_api.stack_get_by_name(context, stack_name)
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resource = db_api.resource_get_by_name_and_stack(context,
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resource_name,
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stack.id)
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if not resource:
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return ['Unknown resource', None]
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new_event = {
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'name': event['message'],
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'resource_status_reason': event['reason'],
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'StackId': stack.id,
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'LogicalResourceId': resource.name,
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'PhysicalResourceId': None,
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'ResourceType': event['resource_type'],
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'ResourceProperties': {},
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}
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try:
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result = db_api.event_create(context, new_event)
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new_event['id'] = result.id
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return [None, new_event]
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except Exception as ex:
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logger.warn('db error %s' % str(ex))
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msg = 'Error creating event'
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return [msg, None]
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def describe_stack_resource(self, context, stack_name, resource_name):
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auth.authenticate(context)
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s = db_api.stack_get_by_name(context, stack_name)
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if not s:
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raise AttributeError('Unknown stack name')
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stack = parser.Stack.load(context, s.id)
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if resource_name not in stack:
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raise AttributeError('Unknown resource name')
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resource = stack[resource_name]
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if resource.id is None:
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raise AttributeError('Resource not created')
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return api.format_stack_resource(stack[resource_name])
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def describe_stack_resources(self, context, stack_name,
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physical_resource_id, logical_resource_id):
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auth.authenticate(context)
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if stack_name is not None:
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s = db_api.stack_get_by_name(context, stack_name)
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else:
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rs = db_api.resource_get_by_physical_resource_id(context,
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physical_resource_id)
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if not rs:
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msg = "The specified PhysicalResourceId doesn't exist"
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raise AttributeError(msg)
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s = rs.stack
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if not s:
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raise AttributeError("The specified stack doesn't exist")
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stack = parser.Stack.load(context, s.id)
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if logical_resource_id is not None:
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name_match = lambda r: r.name == logical_resource_id
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else:
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name_match = lambda r: True
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return [api.format_stack_resource(resource)
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for resource in stack if resource.id is not None and
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name_match(resource)]
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def list_stack_resources(self, context, stack_name):
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auth.authenticate(context)
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s = db_api.stack_get_by_name(context, stack_name)
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if not s:
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raise AttributeError('Unknown stack name')
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stack = parser.Stack.load(context, s.id)
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return [api.format_stack_resource(resource)
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for resource in stack if resource.id is not None]
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def metadata_register_address(self, context, url):
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cfg.CONF.heat_metadata_server_url = url
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def metadata_list_stacks(self, context):
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"""
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Return the names of the stacks registered with Heat.
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"""
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stacks = db_api.stack_get_all(context)
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return [s.name for s in stacks]
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def metadata_list_resources(self, context, stack_name):
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"""
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Return the resource IDs of the given stack.
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"""
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stack = db_api.stack_get_by_name(None, stack_name)
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if stack:
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return [res.name for res in stack.resources]
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else:
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return None
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def metadata_get_resource(self, context, stack_name, resource_name):
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"""
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Get the metadata for the given resource.
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"""
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s = db_api.stack_get_by_name(None, stack_name)
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if not s:
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logger.warn("Stack %s not found" % stack_name)
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return ['stack', None]
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stack = parser.Stack.load(None, s.id)
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if resource_name not in stack:
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logger.warn("Resource not found %s:%s." % (stack_name,
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resource_name))
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return ['resource', None]
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resource = stack[resource_name]
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return [None, resource.metadata]
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def metadata_update(self, context, stack_id, resource_name, metadata):
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"""
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Update the metadata for the given resource.
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"""
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s = db_api.stack_get(None, stack_id)
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if s is None:
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logger.warn("Stack %s not found" % stack_id)
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return ['stack', None]
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stack = parser.Stack.load(None, s.id)
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if resource_name not in stack:
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logger.warn("Resource not found %s:%s." % (stack_id,
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resource_name))
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return ['resource', None]
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resource = stack[resource_name]
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resource.metadata = metadata
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return [None, resource.metadata]
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@manager.periodic_task
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def _periodic_watcher_task(self, context):
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now = timeutils.utcnow()
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try:
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wrs = db_api.watch_rule_get_all(context)
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except Exception as ex:
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logger.warn('periodic_task db error (%s) %s' %
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('watch rule removed?', str(ex)))
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return
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for wr in wrs:
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# has enough time progressed to run the rule
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dt_period = datetime.timedelta(seconds=int(wr.rule['Period']))
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if now < (wr.last_evaluated + dt_period):
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continue
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self.run_rule(context, wr, now)
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def run_rule(self, context, wr, now=timeutils.utcnow()):
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action_map = {'ALARM': 'AlarmActions',
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'NORMAL': 'OKActions',
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'NODATA': 'InsufficientDataActions'}
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watcher = watchrule.WatchRule(wr.rule, wr.watch_data,
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wr.last_evaluated, now)
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new_state = watcher.get_alarm_state()
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if new_state != wr.state:
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logger.warn('WATCH: stack:%s, watch_name:%s %s',
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wr.stack_name, wr.name, new_state)
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if not action_map[new_state] in wr.rule:
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logger.info('no action for new state %s',
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new_state)
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wr.state = new_state
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wr.save()
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else:
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s = db_api.stack_get_by_name(None, wr.stack_name)
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if s and s.status in ('CREATE_COMPLETE',
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'UPDATE_COMPLETE'):
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user_creds = db_api.user_creds_get(s.user_creds_id)
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ctxt = ctxtlib.RequestContext.from_dict(dict(user_creds))
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stack = parser.Stack.load(ctxt, s.id)
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for a in wr.rule[action_map[new_state]]:
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greenpool.spawn_n(stack[a].alarm)
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wr.state = new_state
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wr.save()
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wr.last_evaluated = now
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def create_watch_data(self, context, watch_name, stats_data):
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'''
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This could be used by CloudWatch and WaitConditions
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and treat HA service events like any other CloudWatch.
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'''
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wr = db_api.watch_rule_get(None, watch_name)
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if wr is None:
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logger.warn('NoSuch watch:%s' % (watch_name))
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return ['NoSuch Watch Rule', None]
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if not wr.rule['MetricName'] in stats_data:
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logger.warn('new data has incorrect metric:%s' %
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(wr.rule['MetricName']))
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return ['MetricName %s missing' % wr.rule['MetricName'], None]
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watch_data = {
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'data': stats_data,
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'watch_rule_id': wr.id
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}
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wd = db_api.watch_data_create(None, watch_data)
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logger.debug('new watch:%s data:%s' % (watch_name, str(wd.data)))
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if wr.rule['Statistic'] == 'SampleCount':
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self.run_rule(None, wr)
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return [None, wd.data]
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