Merge pull request #4835 from sivel/rax-clb

Add module to create Rackspace Cloud Loadblancers. Fixes #4794

library/cloud/rax_clb

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python -tt
 # This file is part of Ansible
 #
 # Ansible is free software: you can redistribute it and/or modify
@@ -17,334 +17,319 @@
 DOCUMENTATION = '''
 ---
 module: rax_clb
-short_description: add, modify and remove nodes from a Rackspace Cloud Load Balancer
+short_description: create / delete a load balancer in Rackspace Public Cloud
 description:
-  - Adds, modifies and removes nodes from a Rackspace Cloud Load Balancer
+     - creates / deletes a Rackspace Public Cloud load balancer.
 version_added: "1.4"
 options:
-  address:
+  algorithm:
-    required: false
     description:
-      - IP address or domain name of the node
+      - algorithm for the balancer being created
+    choices: ['RANDOM', 'LEAST_CONNECTIONS', 'ROUND_ROBIN', 'WEIGHTED_LEAST_CONNECTIONS', 'WEIGHTED_ROUND_ROBIN']
+    default: LEAST_CONNECTIONS
   api_key:
-    required: false
     description:
       - Rackspace API key (overrides C(credentials))
-  condition:
-    required: false
-    choices: [ "enabled", "disabled", "draining" ]
-    description:
-      - Condition for the node, which determines its role within the load
-        balancer
   credentials:
-    required: false
     description:
       - File to find the Rackspace credentials in (ignored if C(api_key) and
         C(username) are provided)
-  load_balancer_id:
+    default: null
-    required: true
+    aliases: ['creds_file']
-    type: integer
+  meta:
     description:
-      - Load balancer id
+      - A hash of metadata to associate with the instance
-  node_id:
+    default: null
-    required: false
+  name:
-    type: integer
     description:
-      - Node id
+      - Name to give the load balancer
+    default: null
   port:
-    required: false
-    type: integer
     description:
-      - Port number of the load balanced service on the node
+      - Port for the balancer being created
+    default: 80
+  protocol:
+    description:
+      - Protocol for the balancer being created
+    choices: ['DNS_TCP', 'DNS_UDP' ,'FTP', 'HTTP', 'HTTPS', 'IMAPS', 'IMAPv4', 'LDAP', 'LDAPS', 'MYSQL', 'POP3', 'POP3S', 'SMTP', 'TCP', 'TCP_CLIENT_FIRST', 'UDP', 'UDP_STREAM', 'SFTP']
+    default: HTTP
   region:
-    required: false
     description:
-     - Region to authenticate in
+      - Region to create the load balancer in
+    default: DFW
   state:
-    required: false
-    default: "present"
-    choices: [ "present", "absent" ]
     description:
-      - Indicate desired state of the node
+      - Indicate desired state of the resource
+    choices: ['present', 'absent']
+    default: present
+  timeout:
+    description:
+      - timeout for communication between the balancer and the node
+    default: 30
   type:
-    required: false
-    choices: [ "primary", "secondary" ]
     description:
-      - Type of node
+      - type of interface for the balancer being created
+    choices: ['PUBLIC', 'SERVICENET']
+    default: PUBLIC
   username:
-    required: false
     description:
-     - Rackspace username (overrides C(credentials))
+      - Rackspace username (overrides C(credentials))
-  virtualenv:
-    required: false
-    description:
-      - Path to a virtualenv that should be activated before doing anything.
-        The virtualenv has to already exist. Useful if installing pyrax
-        globally is not an option.
   wait:
-    required: false
+    description:
+      - wait for the balancer to be in state 'running' before returning
     default: "no"
     choices: [ "yes", "no" ]
-    description:
-      - Wait for the load balancer to become active before returning
   wait_timeout:
-    required: false
-    type: integer
-    default: 30
     description:
-      - How long to wait before giving up and returning an error
+      - how long before wait gives up, in seconds
-  weight:
+    default: 300
-    required: false
-    description:
-      - Weight of node
 requirements: [ "pyrax" ]
-author: Lukasz Kawczynski
+author: Christopher H. Laco, Matt Martz
 notes:
-  - "The following environment variables can be used: C(RAX_USERNAME),
+  - The following environment variables can be used, C(RAX_USERNAME),
-    C(RAX_API_KEY), C(RAX_CREDENTIALS) and C(RAX_REGION)."
+    C(RAX_API_KEY), C(RAX_CREDS_FILE), C(RAX_CREDENTIALS), C(RAX_REGION).
+  - C(RAX_CREDENTIALS) and C(RAX_CREDS_FILE) points to a credentials file
+    appropriate for pyrax. See U(https://github.com/rackspace/pyrax/blob/master/docs/getting_started.md#authenticating)
+  - C(RAX_USERNAME) and C(RAX_API_KEY) obviate the use of a credentials file
+  - C(RAX_REGION) defines a Rackspace Public Cloud region (DFW, ORD, LON, ...)
 '''
 
 EXAMPLES = '''
-# Add a new node to the load balancer
+- name: Build a Load Balancer
-- local_action:
+  gather_facts: False
-    module: rax_clb
+  hosts: local
-    load_balancer_id: 71
+  connection: local
-    address: 10.2.2.3
+  tasks:
-    port: 80
+    - name: Load Balancer create request
-    condition: enabled
+      local_action:
-    type: primary
+        module: rax_clb
-    wait: yes
+        credentials: ~/.raxpub
-    credentials: /path/to/credentials
+        name: my-lb
-
+        port: 8080
-# Drain connections from a node
+        protocol: HTTP
-- local_action:
+        type: SERVICENET
-    module: rax_clb
+        timeout: 30
-    load_balancer_id: 71
+        region: DFW
-    node_id: 410
+        wait: yes
-    condition: draining
+        state: present
-    wait: yes
+        meta:
-    credentials: /path/to/credentials
+          app: my-cool-app
-
+      register: my_lb
-# Remove a node from the load balancer
-- local_action:
-    module: rax_clb
-    load_balancer_id: 71
-    node_id: 410
-    state: absent
-    wait: yes
-    credentials: /path/to/credentials
 '''
 
+import sys
 import os
 
+from types import NoneType
 
-def _activate_virtualenv(path):
+try:
-    path = os.path.expanduser(path)
+    import pyrax
-    activate_this = os.path.join(path, 'bin', 'activate_this.py')
+except ImportError:
-    execfile(activate_this, dict(__file__=activate_this))
+    print("failed=True msg='pyrax required for this module'")
+    sys.exit(1)
+
+NON_CALLABLES = (basestring, bool, dict, int, list, NoneType)
+ALGORITHMS = ['RANDOM', 'LEAST_CONNECTIONS', 'ROUND_ROBIN',
+              'WEIGHTED_LEAST_CONNECTIONS', 'WEIGHTED_ROUND_ROBIN']
+PROTOCOLS = ['DNS_TCP', 'DNS_UDP', 'FTP', 'HTTP', 'HTTPS', 'IMAPS', 'IMAPv4',
+             'LDAP', 'LDAPS', 'MYSQL', 'POP3', 'POP3S', 'SMTP', 'TCP',
+             'TCP_CLIENT_FIRST', 'UDP', 'UDP_STREAM', 'SFTP']
 
 
-def _get_node(lb, node_id):
+def cloud_load_balancer(module, state, name, meta, algorithm, port, protocol,
-    """Return a node with the given `node_id`"""
+                        vip_type, timeout, wait, wait_timeout):
-    for node in lb.nodes:
+    for arg in (state, name, port, protocol, vip_type):
-        if node.id == node_id:
+        if not arg:
-            return node
+            module.fail_json(msg='%s is required for rax_clb' % arg)
-    return None
 
+    if int(timeout) < 30:
+        module.fail_json(msg='"timeout" must be greater than or equal to 30')
 
-def _is_primary(node):
+    changed = False
-    """Return True if node is primary and enabled"""
+    balancers = []
-    return (node.type.lower() == 'primary' and
-            node.condition.lower() == 'enabled')
 
+    clb = pyrax.cloud_loadbalancers
 
-def _get_primary_nodes(lb):
+    for balancer in clb.list():
-    """Return a list of primary and enabled nodes"""
+        if name != balancer.name and name != balancer.id:
-    nodes = []
+            continue
-    for node in lb.nodes:
-        if _is_primary(node):
-            nodes.append(node)
-    return nodes
 
+        balancers.append(balancer)
 
-def _node_to_dict(node):
+    if len(balancers) > 1:
-    """Return a dictionary containing node details"""
+        module.fail_json(msg='Multiple Load Balancers were matched by name, '
-    if not node:
+                             'try using the Load Balancer ID instead')
-        return {}
+
-    return {
+    if state == 'present':
-        'address': node.address,
+        if isinstance(meta, dict):
-        'condition': node.condition,
+            metadata = [dict(key=k, value=v) for k, v in meta.items()]
-        'id': node.id,
+
-        'port': node.port,
+        if not balancers:
-        'type': node.type,
+            try:
-        'weight': node.weight,
+                virtual_ips = [clb.VirtualIP(type=vip_type)]
-    }
+                balancer = clb.create(name, metadata=metadata, port=port,
+                                      algorithm=algorithm, protocol=protocol,
+                                      timeout=timeout, virtual_ips=virtual_ips)
+                changed = True
+            except Exception, e:
+                module.fail_json(msg='%s' % e.message)
+        else:
+            balancer = balancers[0]
+            setattr(balancer, 'metadata',
+                    [dict(key=k, value=v) for k, v in
+                     balancer.get_metadata().items()])
+            atts = {
+                'name': name,
+                'algorithm': algorithm,
+                'port': port,
+                'protocol': protocol,
+                'timeout': timeout
+            }
+            for att, value in atts.iteritems():
+                current = getattr(balancer, att)
+                if current != value:
+                    changed = True
+
+            if changed:
+                balancer.update(**atts)
+
+            if balancer.metadata != metadata:
+                balancer.set_metadata(meta)
+                changed = True
+
+            virtual_ips = [clb.VirtualIP(type=vip_type)]
+            current_vip_types = set([v.type for v in balancer.virtual_ips])
+            vip_types = set([v.type for v in virtual_ips])
+            if current_vip_types != vip_types:
+                module.fail_json(msg='Load balancer Virtual IP type cannot '
+                                     'be changed')
+
+        if wait:
+            attempts = wait_timeout / 5
+            print attempts
+            pyrax.utils.wait_for_build(balancer, interval=5, attempts=attempts)
+
+        balancer.get()
+        instance = {}
+        for key, value in vars(balancer).iteritems():
+            if key == 'virtual_ips':
+                virtual_ips = []
+                instance[key] = []
+                for vip in value:
+                    vip_dict = {}
+                    for vip_key, vip_value in vars(vip).iteritems():
+                        if isinstance(vip_value, NON_CALLABLES):
+                            vip_dict[vip_key] = vip_value
+                    instance[key].append(vip_dict)
+            elif (isinstance(value, NON_CALLABLES) and
+                    not key.startswith('_')):
+                instance[key] = value
+
+        result = dict(changed=changed, balancer=instance)
+
+        if balancer.status == 'ERROR':
+            result['msg'] = '%s failed to build' % balancer.id
+        elif wait and balancer.status not in ('ACTIVE', 'ERROR'):
+            result['msg'] = 'Timeout waiting on %s' % balancer.id
+
+        if 'msg' in result:
+            module.fail_json(**result)
+        else:
+            module.exit_json(**result)
+
+    elif state == 'absent':
+        if balancers:
+            balancer = balancers[0]
+            try:
+                balancer.delete()
+                changed = True
+            except Exception, e:
+                module.fail_json(msg='%s' % e.message)
+
+            instance = {}
+            for key, value in vars(balancer).iteritems():
+                if key == 'virtual_ips':
+                    virtual_ips = []
+                    instance[key] = []
+                    for vip in value:
+                        vip_dict = {}
+                        for vip_key, vip_value in vars(vip).iteritems():
+                            if isinstance(vip_value, NON_CALLABLES):
+                                vip_dict[vip_key] = vip_value
+                        instance[key].append(vip_dict)
+                elif (isinstance(value, NON_CALLABLES) and
+                        not key.startswith('_')):
+                    instance[key] = value
+
+            if wait:
+                attempts = wait_timeout / 5
+                pyrax.utils.wait_until(balancer, 'status', ('DELETED'),
+                                       interval=5, attempts=attempts)
+        else:
+            instance = {}
+
+    module.exit_json(changed=changed, balancer=instance)
 
 
 def main():
     module = AnsibleModule(
         argument_spec=dict(
-            address=dict(),
+            algorithm=dict(choices=ALGORITHMS, default='LEAST_CONNECTIONS'),
             api_key=dict(),
-            condition=dict(choices=['enabled', 'disabled', 'draining']),
+            credentials=dict(aliases=['creds_file']),
-            credentials=dict(),
+            meta=dict(type='dict', default={}),
-            load_balancer_id=dict(required=True, type='int'),
+            name=dict(),
-            node_id=dict(type='int'),
+            port=dict(type='int', default=80),
-            port=dict(type='int'),
+            protocol=dict(choices=PROTOCOLS, default='HTTP'),
             region=dict(),
             state=dict(default='present', choices=['present', 'absent']),
-            type=dict(choices=['primary', 'secondary']),
+            timeout=dict(type='int', default=30),
+            type=dict(choices=['PUBLIC', 'SERVICENET'], default='PUBLIC'),
             username=dict(),
-            virtualenv=dict(),
+            wait=dict(type='bool'),
-            wait=dict(default=False, type='bool'),
+            wait_timeout=dict(default=300),
-            wait_timeout=dict(default=30, type='int'),
-            weight=dict(type='int'),
         ),
-        required_together=[
-            ['api_key', 'username']
-        ],
     )
 
-    address = module.params['address']
+    algorithm = module.params.get('algorithm')
-    api_key = module.params['api_key']
+    api_key = module.params.get('api_key')
-    condition = (module.params['condition'] and
+    credentials = module.params.get('credentials')
-                 module.params['condition'].upper())
+    meta = module.params.get('meta')
-    credentials = module.params['credentials']
+    name = module.params.get('name')
-    load_balancer_id = module.params['load_balancer_id']
+    port = module.params.get('port')
-    node_id = module.params['node_id']
+    protocol = module.params.get('protocol')
-    port = module.params['port']
+    region = module.params.get('region')
-    region = module.params['region']
+    state = module.params.get('state')
-    state = module.params['state']
+    timeout = int(module.params.get('timeout'))
-    typ = module.params['type'] and module.params['type'].upper()
+    username = module.params.get('username')
-    username = module.params['username']
+    vip_type = module.params.get('type')
-    virtualenv = module.params['virtualenv']
+    wait = module.params.get('wait')
-    wait = module.params['wait']
+    wait_timeout = int(module.params.get('wait_timeout'))
-    wait_timeout = module.params['wait_timeout'] or 1
-    weight = module.params['weight']
-
-    if virtualenv:
-        try:
-            _activate_virtualenv(virtualenv)
-        except IOError, e:
-            module.fail_json(msg='Failed to activate virtualenv %s (%s)' % (
-                                 virtualenv, e))
 
     try:
-        import pyrax
+        username = username or os.environ.get('RAX_USERNAME')
-    except ImportError:
+        api_key = api_key or os.environ.get('RAX_API_KEY')
-        module.fail_json(msg='pyrax is not installed')
+        credentials = (credentials or os.environ.get('RAX_CREDENTIALS') or
-
+                       os.environ.get('RAX_CREDS_FILE'))
-    username = username or os.environ.get('RAX_USERNAME')
+        region = region or os.environ.get('RAX_REGION')
-    api_key = api_key or os.environ.get('RAX_API_KEY')
+    except KeyError, e:
-    credentials = credentials or os.environ.get('RAX_CREDENTIALS')
+        module.fail_json(msg='Unable to load %s' % e.message)
-    region = region or os.environ.get('RAX_REGION')
-
-    pyrax.set_setting("identity_type", "rackspace")
 
     try:
+        pyrax.set_setting('identity_type', 'rackspace')
         if api_key and username:
             pyrax.set_credentials(username, api_key=api_key, region=region)
         elif credentials:
             credentials = os.path.expanduser(credentials)
             pyrax.set_credential_file(credentials, region=region)
         else:
-            module.fail_json(msg='Credentials not set')
+            raise Exception('No credentials supplied!')
-    except pyrax.exc.PyraxException, e:
+    except Exception, e:
         module.fail_json(msg='%s' % e.message)
 
-    if not pyrax.cloud_loadbalancers:
+    cloud_load_balancer(module, state, name, meta, algorithm, port, protocol,
-        module.fail_json(msg='Failed to instantiate load balancer client '
+                        vip_type, timeout, wait, wait_timeout)
-                             '(possibly incorrect region)')
 
-    try:
+from ansible.module_utils.basic import *
-        lb = pyrax.cloud_loadbalancers.get(load_balancer_id)
-    except pyrax.exc.PyraxException, e:
-        module.fail_json(msg='%s' % e.message)
 
-    if node_id:
-        node = _get_node(lb, node_id)
-    else:
-        node = None
-
-    result = _node_to_dict(node)
-
-    if state == 'absent':
-        if not node:  # Removing a non-existent node
-            module.exit_json(changed=False, state=state)
-
-        # The API detects this as well but currently pyrax does not return a
-        # meaningful error message
-        if _is_primary(node) and len(_get_primary_nodes(lb)) == 1:
-            module.fail_json(
-                msg='At least one primary node has to be enabled')
-
-        try:
-            lb.delete_node(node)
-            result = {}
-        except pyrax.exc.NotFound:
-            module.exit_json(changed=False, state=state)
-        except pyrax.exc.PyraxException, e:
-            module.fail_json(msg='%s' % e.message)
-    else:  # present
-        if not node:
-            if node_id:  # Updating a non-existent node
-                msg = 'Node %d not found' % node_id
-                if lb.nodes:
-                    msg += (' (available nodes: %s)' %
-                            ', '.join([str(x.id) for x in lb.nodes]))
-                module.fail_json(msg=msg)
-            else:  # Creating a new node
-                try:
-                    node = pyrax.cloudloadbalancers.Node(
-                        address=address, port=port, condition=condition,
-                        weight=weight, type=typ)
-                    resp, body = lb.add_nodes([node])
-                    result.update(body['nodes'][0])
-                except pyrax.exc.PyraxException, e:
-                    module.fail_json(msg='%s' % e.message)
-        else:  # Updating an existing node
-            immutable = {
-                'address': address,
-                'port': port,
-            }
-
-            mutable = {
-                'condition': condition,
-                'type': typ,
-                'weight': weight,
-            }
-
-            for name, value in immutable.items():
-                if value:
-                    module.fail_json(
-                        msg='Attribute %s cannot be modified' % name)
-
-            for name, value in mutable.items():
-                if value is None or value == getattr(node, name):
-                    mutable.pop(name)
-
-            if not mutable:
-                module.exit_json(changed=False, state=state, node=result)
-
-            try:
-                # The diff has to be set explicitly to update node's weight and
-                # type; this should probably be fixed in pyrax
-                lb.update_node(node, diff=mutable)
-                result.update(mutable)
-            except pyrax.exc.PyraxException, e:
-                module.fail_json(msg='%s' % e.message)
-
-    if wait:
-        pyrax.utils.wait_until(lb, "status", "ACTIVE", interval=1,
-                               attempts=wait_timeout)
-        if lb.status != 'ACTIVE':
-            module.fail_json(
-                msg='Load balancer not active after %ds (current status: %s)' %
-                    (wait_timeout, lb.status.lower()))
-
-    kwargs = {'node': result} if result else {}
-    module.exit_json(changed=True, state=state, **kwargs)
-
-# this is magic, see lib/ansible/module_common.py
-#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
 main()

library/cloud/rax_clb_nodes

@@ -0,0 +1,350 @@
+#!/usr/bin/python
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+DOCUMENTATION = '''
+---
+module: rax_clb_nodes
+short_description: add, modify and remove nodes from a Rackspace Cloud Load Balancer
+description:
+  - Adds, modifies and removes nodes from a Rackspace Cloud Load Balancer
+version_added: "1.4"
+options:
+  address:
+    required: false
+    description:
+      - IP address or domain name of the node
+  api_key:
+    required: false
+    description:
+      - Rackspace API key (overrides C(credentials))
+  condition:
+    required: false
+    choices: [ "enabled", "disabled", "draining" ]
+    description:
+      - Condition for the node, which determines its role within the load
+        balancer
+  credentials:
+    required: false
+    description:
+      - File to find the Rackspace credentials in (ignored if C(api_key) and
+        C(username) are provided)
+  load_balancer_id:
+    required: true
+    type: integer
+    description:
+      - Load balancer id
+  node_id:
+    required: false
+    type: integer
+    description:
+      - Node id
+  port:
+    required: false
+    type: integer
+    description:
+      - Port number of the load balanced service on the node
+  region:
+    required: false
+    description:
+     - Region to authenticate in
+  state:
+    required: false
+    default: "present"
+    choices: [ "present", "absent" ]
+    description:
+      - Indicate desired state of the node
+  type:
+    required: false
+    choices: [ "primary", "secondary" ]
+    description:
+      - Type of node
+  username:
+    required: false
+    description:
+     - Rackspace username (overrides C(credentials))
+  virtualenv:
+    required: false
+    description:
+      - Path to a virtualenv that should be activated before doing anything.
+        The virtualenv has to already exist. Useful if installing pyrax
+        globally is not an option.
+  wait:
+    required: false
+    default: "no"
+    choices: [ "yes", "no" ]
+    description:
+      - Wait for the load balancer to become active before returning
+  wait_timeout:
+    required: false
+    type: integer
+    default: 30
+    description:
+      - How long to wait before giving up and returning an error
+  weight:
+    required: false
+    description:
+      - Weight of node
+requirements: [ "pyrax" ]
+author: Lukasz Kawczynski
+notes:
+  - "The following environment variables can be used: C(RAX_USERNAME),
+    C(RAX_API_KEY), C(RAX_CREDENTIALS) and C(RAX_REGION)."
+'''
+
+EXAMPLES = '''
+# Add a new node to the load balancer
+- local_action:
+    module: rax_clb_nodes
+    load_balancer_id: 71
+    address: 10.2.2.3
+    port: 80
+    condition: enabled
+    type: primary
+    wait: yes
+    credentials: /path/to/credentials
+
+# Drain connections from a node
+- local_action:
+    module: rax_clb_nodes
+    load_balancer_id: 71
+    node_id: 410
+    condition: draining
+    wait: yes
+    credentials: /path/to/credentials
+
+# Remove a node from the load balancer
+- local_action:
+    module: rax_clb_nodes
+    load_balancer_id: 71
+    node_id: 410
+    state: absent
+    wait: yes
+    credentials: /path/to/credentials
+'''
+
+import os
+
+
+def _activate_virtualenv(path):
+    path = os.path.expanduser(path)
+    activate_this = os.path.join(path, 'bin', 'activate_this.py')
+    execfile(activate_this, dict(__file__=activate_this))
+
+
+def _get_node(lb, node_id):
+    """Return a node with the given `node_id`"""
+    for node in lb.nodes:
+        if node.id == node_id:
+            return node
+    return None
+
+
+def _is_primary(node):
+    """Return True if node is primary and enabled"""
+    return (node.type.lower() == 'primary' and
+            node.condition.lower() == 'enabled')
+
+
+def _get_primary_nodes(lb):
+    """Return a list of primary and enabled nodes"""
+    nodes = []
+    for node in lb.nodes:
+        if _is_primary(node):
+            nodes.append(node)
+    return nodes
+
+
+def _node_to_dict(node):
+    """Return a dictionary containing node details"""
+    if not node:
+        return {}
+    return {
+        'address': node.address,
+        'condition': node.condition,
+        'id': node.id,
+        'port': node.port,
+        'type': node.type,
+        'weight': node.weight,
+    }
+
+
+def main():
+    module = AnsibleModule(
+        argument_spec=dict(
+            address=dict(),
+            api_key=dict(),
+            condition=dict(choices=['enabled', 'disabled', 'draining']),
+            credentials=dict(),
+            load_balancer_id=dict(required=True, type='int'),
+            node_id=dict(type='int'),
+            port=dict(type='int'),
+            region=dict(),
+            state=dict(default='present', choices=['present', 'absent']),
+            type=dict(choices=['primary', 'secondary']),
+            username=dict(),
+            virtualenv=dict(),
+            wait=dict(default=False, type='bool'),
+            wait_timeout=dict(default=30, type='int'),
+            weight=dict(type='int'),
+        ),
+        required_together=[
+            ['api_key', 'username']
+        ],
+    )
+
+    address = module.params['address']
+    api_key = module.params['api_key']
+    condition = (module.params['condition'] and
+                 module.params['condition'].upper())
+    credentials = module.params['credentials']
+    load_balancer_id = module.params['load_balancer_id']
+    node_id = module.params['node_id']
+    port = module.params['port']
+    region = module.params['region']
+    state = module.params['state']
+    typ = module.params['type'] and module.params['type'].upper()
+    username = module.params['username']
+    virtualenv = module.params['virtualenv']
+    wait = module.params['wait']
+    wait_timeout = module.params['wait_timeout'] or 1
+    weight = module.params['weight']
+
+    if virtualenv:
+        try:
+            _activate_virtualenv(virtualenv)
+        except IOError, e:
+            module.fail_json(msg='Failed to activate virtualenv %s (%s)' % (
+                                 virtualenv, e))
+
+    try:
+        import pyrax
+    except ImportError:
+        module.fail_json(msg='pyrax is not installed')
+
+    username = username or os.environ.get('RAX_USERNAME')
+    api_key = api_key or os.environ.get('RAX_API_KEY')
+    credentials = credentials or os.environ.get('RAX_CREDENTIALS')
+    region = region or os.environ.get('RAX_REGION')
+
+    pyrax.set_setting("identity_type", "rackspace")
+
+    try:
+        if api_key and username:
+            pyrax.set_credentials(username, api_key=api_key, region=region)
+        elif credentials:
+            credentials = os.path.expanduser(credentials)
+            pyrax.set_credential_file(credentials, region=region)
+        else:
+            module.fail_json(msg='Credentials not set')
+    except pyrax.exc.PyraxException, e:
+        module.fail_json(msg='%s' % e.message)
+
+    if not pyrax.cloud_loadbalancers:
+        module.fail_json(msg='Failed to instantiate load balancer client '
+                             '(possibly incorrect region)')
+
+    try:
+        lb = pyrax.cloud_loadbalancers.get(load_balancer_id)
+    except pyrax.exc.PyraxException, e:
+        module.fail_json(msg='%s' % e.message)
+
+    if node_id:
+        node = _get_node(lb, node_id)
+    else:
+        node = None
+
+    result = _node_to_dict(node)
+
+    if state == 'absent':
+        if not node:  # Removing a non-existent node
+            module.exit_json(changed=False, state=state)
+
+        # The API detects this as well but currently pyrax does not return a
+        # meaningful error message
+        if _is_primary(node) and len(_get_primary_nodes(lb)) == 1:
+            module.fail_json(
+                msg='At least one primary node has to be enabled')
+
+        try:
+            lb.delete_node(node)
+            result = {}
+        except pyrax.exc.NotFound:
+            module.exit_json(changed=False, state=state)
+        except pyrax.exc.PyraxException, e:
+            module.fail_json(msg='%s' % e.message)
+    else:  # present
+        if not node:
+            if node_id:  # Updating a non-existent node
+                msg = 'Node %d not found' % node_id
+                if lb.nodes:
+                    msg += (' (available nodes: %s)' %
+                            ', '.join([str(x.id) for x in lb.nodes]))
+                module.fail_json(msg=msg)
+            else:  # Creating a new node
+                try:
+                    node = pyrax.cloudloadbalancers.Node(
+                        address=address, port=port, condition=condition,
+                        weight=weight, type=typ)
+                    resp, body = lb.add_nodes([node])
+                    result.update(body['nodes'][0])
+                except pyrax.exc.PyraxException, e:
+                    module.fail_json(msg='%s' % e.message)
+        else:  # Updating an existing node
+            immutable = {
+                'address': address,
+                'port': port,
+            }
+
+            mutable = {
+                'condition': condition,
+                'type': typ,
+                'weight': weight,
+            }
+
+            for name, value in immutable.items():
+                if value:
+                    module.fail_json(
+                        msg='Attribute %s cannot be modified' % name)
+
+            for name, value in mutable.items():
+                if value is None or value == getattr(node, name):
+                    mutable.pop(name)
+
+            if not mutable:
+                module.exit_json(changed=False, state=state, node=result)
+
+            try:
+                # The diff has to be set explicitly to update node's weight and
+                # type; this should probably be fixed in pyrax
+                lb.update_node(node, diff=mutable)
+                result.update(mutable)
+            except pyrax.exc.PyraxException, e:
+                module.fail_json(msg='%s' % e.message)
+
+    if wait:
+        pyrax.utils.wait_until(lb, "status", "ACTIVE", interval=1,
+                               attempts=wait_timeout)
+        if lb.status != 'ACTIVE':
+            module.fail_json(
+                msg='Load balancer not active after %ds (current status: %s)' %
+                    (wait_timeout, lb.status.lower()))
+
+    kwargs = {'node': result} if result else {}
+    module.exit_json(changed=True, state=state, **kwargs)
+
+# this is magic, see lib/ansible/module_common.py
+#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
+main()