296 lines
9.2 KiB
Python
296 lines
9.2 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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import urllib2
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import json
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import logging
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from heat.common import exception
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from heat.engine.resources import Resource
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from heat.db import api as db_api
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from heat.engine import parser
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from novaclient.exceptions import NotFound
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logger = logging.getLogger(__file__)
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lb_template = '''
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{
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"AWSTemplateFormatVersion": "2010-09-09",
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"Description": "Built in HAProxy server",
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"Parameters" : {
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"KeyName" : {
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"Type" : "String"
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}
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},
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"Resources": {
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"LoadBalancerInstance": {
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"Type": "AWS::EC2::Instance",
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"Metadata": {
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"AWS::CloudFormation::Init": {
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"config": {
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"packages": {
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"yum": {
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"haproxy" : []
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}
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},
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"services": {
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"systemd": {
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"haproxy" : { "enabled": "true", "ensureRunning": "true" }
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}
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},
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"files": {
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"/etc/haproxy/haproxy.cfg": {
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"content": ""},
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"mode": "000644",
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"owner": "root",
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"group": "root"
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}
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}
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}
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},
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"Properties": {
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"ImageId": "F16-x86_64-cfntools",
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"InstanceType": "m1.small",
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"KeyName": { "Ref": "KeyName" },
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"UserData": { "Fn::Base64": { "Fn::Join": ["", [
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"#!/bin/bash -v\\n",
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"/opt/aws/bin/cfn-init -s ",
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{ "Ref": "AWS::StackName" },
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" --region ", { "Ref": "AWS::Region" }, "\\n"
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]]}}
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}
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}
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},
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"Outputs": {
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"PublicIp": {
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"Value": { "Fn::GetAtt": [ "LoadBalancerInstance", "PublicIp" ] },
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"Description": "instance IP"
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}
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}
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}
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'''
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#
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# TODO(asalkeld) once we have done a couple of these composite
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# Resources we should probably make a generic CompositeResource class.
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# There will be plenty of scope for it. I resisted doing this initially
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# to see how what the other composites require.
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#
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# Also the above inline template _could_ be placed in an external file
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# at the moment this is because we will probably need to implement a
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# LoadBalancer based on keepalived as well (for for ssl support).
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#
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class LoadBalancer(Resource):
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listeners_schema = {
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'InstancePort': {'Type': 'Integer',
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'Required': True},
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'LoadBalancerPort': {'Type': 'Integer',
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'Required': True},
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'Protocol': {'Type': 'String',
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'Required': True,
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'AllowedValues': ['TCP', 'HTTP']},
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'SSLCertificateId': {'Type': 'String',
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'Implemented': False},
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'PolicyNames': {'Type': 'Map',
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'Implemented': False}
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}
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healthcheck_schema = {
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'HealthyThreshold': {'Type': 'Integer',
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'Required': True},
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'Interval': {'Type': 'Integer',
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'Required': True},
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'Target': {'Type': 'String',
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'Required': True},
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'Timeout': {'Type': 'Integer',
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'Required': True},
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'UnHealthyTheshold': {'Type': 'Integer',
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'Required': True},
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}
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properties_schema = {
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'AvailabilityZones': {'Type': 'List',
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'Required': True},
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'HealthCheck': {'Type': 'Map',
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'Implemented': False,
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'Schema': healthcheck_schema},
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'Instances': {'Type': 'List'},
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'Listeners': {'Type': 'List',
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'Schema': listeners_schema},
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'AppCookieStickinessPolicy': {'Type': 'String',
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'Implemented': False},
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'LBCookieStickinessPolicy': {'Type': 'String',
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'Implemented': False},
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'SecurityGroups': {'Type': 'String',
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'Implemented': False},
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'Subnets': {'Type': 'List',
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'Implemented': False}
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}
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def __init__(self, name, json_snippet, stack):
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Resource.__init__(self, name, json_snippet, stack)
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self._nested = None
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def _params(self):
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# total hack - probably need an admin key here.
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params = {'KeyName': {'Ref': 'KeyName'}}
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p = self.stack.resolve_static_data(params)
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return p
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def nested(self):
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if self._nested is None:
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if self.instance_id is None:
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return None
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st = db_api.stack_get(self.stack.context, self.instance_id)
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if not st:
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raise exception.NotFound('Nested stack not found in DB')
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n = parser.Stack(self.stack.context, st.name,
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st.raw_template.parsed_template.template,
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self.instance_id, self._params())
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self._nested = n
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return self._nested
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def _instance_to_ipaddress(self, inst):
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'''
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Return the server's IP address, fetching it from Nova
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'''
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try:
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server = self.nova().servers.get(inst)
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except NotFound as ex:
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logger.warn('Instance IP address not found (%s)' % str(ex))
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else:
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for n in server.networks:
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return server.networks[n][0]
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return '0.0.0.0'
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def _haproxy_config(self, templ):
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# initial simplifications:
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# - only one Listener
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# - static (only use Instances)
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# - only http (no tcp or ssl)
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#
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# option httpchk HEAD /check.txt HTTP/1.0
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gl = '''
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global
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daemon
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maxconn 256
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defaults
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mode http
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timeout connect 5000ms
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timeout client 50000ms
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timeout server 50000ms
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'''
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listener = self.properties['Listeners'][0]
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lb_port = listener['LoadBalancerPort']
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inst_port = listener['InstancePort']
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spaces = ' '
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frontend = '''
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frontend http
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bind *:%s
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''' % (lb_port)
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backend = '''
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default_backend servers
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backend servers
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balance roundrobin
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option http-server-close
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option forwardfor
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'''
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servers = []
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n = 1
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for i in self.properties['Instances']:
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ip = self._instance_to_ipaddress(i)
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servers.append('%sserver server%d %s:%s' % (spaces, n,
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ip, inst_port))
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n = n + 1
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return '%s%s%s%s\n' % (gl, frontend, backend, '\n'.join(servers))
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def handle_create(self):
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templ = json.loads(lb_template)
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md = templ['Resources']['LoadBalancerInstance']['Metadata']
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files = md['AWS::CloudFormation::Init']['config']['files']
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cfg = self._haproxy_config(templ)
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files['/etc/haproxy/haproxy.cfg']['content'] = cfg
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self._nested = parser.Stack(self.stack.context,
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self.name,
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templ,
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parms=self._params(),
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metadata_server=self.stack.metadata_server)
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rt = {'template': templ, 'stack_name': self.name}
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new_rt = db_api.raw_template_create(None, rt)
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parent_stack = db_api.stack_get(self.stack.context, self.stack.id)
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s = {'name': self.name,
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'owner_id': self.stack.id,
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'raw_template_id': new_rt.id,
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'user_creds_id': parent_stack.user_creds_id,
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'username': self.stack.context.username}
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new_s = db_api.stack_create(None, s)
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self._nested.id = new_s.id
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pt = {'template': self._nested.t, 'raw_template_id': new_rt.id}
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new_pt = db_api.parsed_template_create(None, pt)
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self._nested.parsed_template_id = new_pt.id
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self._nested.create()
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self.instance_id_set(self._nested.id)
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def handle_delete(self):
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try:
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stack = self.nested()
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except exception.NotFound:
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logger.info("Stack not found to delete")
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else:
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if stack is not None:
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stack.delete()
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def FnGetAtt(self, key):
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'''
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We don't really support any of these yet.
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'''
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allow = ('CanonicalHostedZoneName',
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'CanonicalHostedZoneNameID',
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'DNSName',
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'SourceSecurityGroupName',
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'SourceSecurityGroupOwnerAlias')
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if not key in allow:
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raise exception.InvalidTemplateAttribute(resource=self.name,
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key=key)
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stack = self.nested()
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if stack is None:
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# This seems like a hack, to get past validation
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return ''
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if key == 'DNSName':
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return stack.output('PublicIp')
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else:
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return ''
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