Enhancements to provide pool creation and attributes

library/net_infrastructure/bigip_pool

@@ -21,72 +21,122 @@
 DOCUMENTATION = '''
 ---
 module: bigip_pool
-short_description: "Manages F5 BIG-IP LTM pool members"
+short_description: "Manages F5 BIG-IP LTM pools"
 description:
-    - "Manages F5 BIG-IP LTM pool members via iControl SOAP API"
+    - "Manages F5 BIG-IP LTM pools via iControl SOAP API"
 version_added: "1.2"
 author: Matt Hite
 notes:
     - "Requires BIG-IP software version >= 11"
     - "F5 developed module 'bigsuds' required (see http://devcentral.f5.com)"
     - "Best run as a local_action in your playbook"
-    - "If pool member IP address is no longer referenced by another pool when running with state=absent, the node IP will also be deleted from the F5 configuration."
 requirements:
     - bigsuds
 options:
     server:
         description:
-            - "BIG-IP host"
+            - BIG-IP host
         required: true
         default: null
         choices: []
         aliases: []
     user:
         description:
-            - "BIG-IP username"
+            - BIG-IP username
         required: true
         default: null
         choices: []
         aliases: []
     password:
         description:
-            - "BIG-IP password"
+            - BIG-IP password
         required: true
         default: null
         choices: []
         aliases: []
     state:
         description:
-            - "Pool member state"
+            - Pool state
         required: false
         default: present
         choices: ['present', 'absent']
         aliases: []
     name:
         description:
-            - "BIG-IP pool name"
+            - Pool name
         required: true
         default: null
         choices: []
         aliases: ['pool']
     partition:
         description:
-            - "BIG-IP partition"
+            - Partition
         required: false
         default: 'Common'
         choices: []
         aliases: []
-    host:
+    lb_method:
         description:
-            - "BIG-IP pool member"
-        required: true
+            - Load balancing method
+        required: False
+        default: 'round_robin'
+        choices: ['round_robin', 'ratio_member', 'least_connection_member',
+                  'observed_member', 'predictive_member', 'ratio_node_address',
+                  'least_connection_node_address', 'fastest_node_address',
+                  'observed_node_address', 'predictive_node_address',
+                  'dynamic_ratio', 'fastest_app_response', 'least_sessions',
+                  'dynamic_ratio_member', 'l3_addr', 'unknown',
+                  'weighted_least_connection_member',
+                  'weighted_least_connection_node_address',
+                  'ratio_session', 'ratio_least_connection_member',
+                  'ratio_least_connection_node_address']
+        aliases: []
+    monitor_type:
+        description:
+            - Monitor rule type when monitors > 1
+        required: False
+        default: null
+        choices: ['and_list', 'm_of_n']
+        aliases: []
+    quorum:
+        description:
+            - Monitor quorum value when monitor_type is m_of_n
+        required: False
+        default: null
+        choices: []
+        aliases: []
+    monitors:
+        description:
+            - Monitor template name list
+        required: False
+        default: null
+        choices: []
+        aliases: []
+    slow_ramp_time:
+        description:
+            - Sets the ramp-up time (in seconds) to gradually ramp up the load on newly added or freshly detected UP pool members
+        required: False
         default: null
         choices: []
         aliases: []
+    service_down_action:
+        description:
+            - Sets the action to take when node goes down in pool
+        required: False
+        default: null
+        choices: ['none', 'reset', 'drop', 'reselect']
+        aliases: []
+    host:
+        description:
+            - "Pool member IP"
+        required: False
+        default: null
+        choices: []
+        aliases: ['address']
     port:
         description:
-            - "BIG-IP pool member port"
-        required: true
+            - "Pool member port"
+        required: False
         default: null
         choices: []
         aliases: []
@@ -98,10 +148,16 @@ EXAMPLES = '''
 
 ## ad-hoc ansible CLI example
 
-# ensures 1.1.1.1:80 is present in pool /matthite/matthite-pool on load balancer lb.mydomain.com
+# Create (or update) pool /matthite/matthite-pool on load balancer lb.mydomain.com
+ansible -c local localhost -m bigip_pool -a "server=lb.mydomain.com user=admin password=mysecret state=present name=matthite-pool partition=matthite lb_method=least_connection_member slow_ramp_time=120"
+
+# Remove pool /matthite/matthite-pool on load balancer lb.mydomain.com
+ansible -c local localhost -m bigip_pool -a "server=lb.mydomain.com user=admin password=mysecret state=absent name=matthite-pool partition=matthite"
+
+# Add pool member /matthite/1.1.1.1:80 to pool /matthite/matthite-pool on load balancer lb.mydomain.com
 ansible -c local localhost -m bigip_pool -a "server=lb.mydomain.com user=admin password=mysecret state=present name=matthite-pool partition=matthite host=1.1.1.1 port=80"
 
-# ensures 1.1.1.1:80 is absent from pool /matthite/matthite-pool on load balancer lb.mydomain.com
+# Remove pool member /matthite/1.1.1.1:80 to pool /matthite/matthite-pool on load balancer lb.mydomain.com
 ansible -c local localhost -m bigip_pool -a "server=lb.mydomain.com user=admin password=mysecret state=absent name=matthite-pool partition=matthite host=1.1.1.1 port=80"
 
 ## playbook task example:
@@ -110,8 +166,8 @@ ansible -c local localhost -m bigip_pool -a "server=lb.mydomain.com user=admin p
 # file bigip-test.yml
 # ...
   tasks:
-  - name: Register current node to load balancer pool
-    local_action: bigip_pool server=lb.mydomain.com user=admin password=mysecret state=present name=matthite-pool partition=matthite host={{ ansible_default_ipv4.address }} port=80
+  - name: Create /matthite/matthite-pool
+    local_action: bigip_pool server=lb.mydomain.com user=admin password=mysecret state=present name=matthite-pool partition=matthite lb_method=least_connection_member slow_ramp_time=120
 '''
 
 try:
@@ -143,6 +199,52 @@ def pool_exists(api, pool):
             raise
     return result
 
+def create_pool(api, pool, lb_method):
+    lb_method = "LB_METHOD_%s" % lb_method.strip().upper()
+    api.LocalLB.Pool.create_v2(pool_names=[pool], lb_methods=[lb_method],
+                               members=[[]])
+
+def remove_pool(api, pool):
+    api.LocalLB.Pool.delete_pool(pool_names=[pool])
+
+def get_lb_method(api, pool):
+    lb_method = api.LocalLB.Pool.get_lb_method(pool_names=[pool])[0]
+    lb_method = lb_method.strip().replace('LB_METHOD_', '').lower()
+    return lb_method
+
+def set_lb_method(api, pool, lb_method):
+    lb_method = "LB_METHOD_%s" % lb_method.strip().upper()
+    api.LocalLB.Pool.set_lb_method(pool_names=[pool], lb_methods=[lb_method])
+
+def get_monitors(api, pool):
+    result = api.LocalLB.Pool.get_monitor_association(pool_names=[pool])[0]['monitor_rule']
+    monitor_type = result['type'].split("MONITOR_RULE_TYPE_")[-1].lower()
+    quorum = result['quorum']
+    monitor_templates = result['monitor_templates']
+    return (monitor_type, quorum, monitor_templates)
+
+def set_monitors(api, pool, monitor_type, quorum, monitor_templates):
+    monitor_type = "MONITOR_RULE_TYPE_%s" % monitor_type.strip().upper()
+    monitor_rule = {'type': monitor_type, 'quorum': quorum, 'monitor_templates': monitor_templates}
+    monitor_association = {'pool_name': pool, 'monitor_rule': monitor_rule}
+    api.LocalLB.Pool.set_monitor_association(monitor_associations=[monitor_association])
+
+def get_slow_ramp_time(api, pool):
+    result = api.LocalLB.Pool.get_slow_ramp_time(pool_names=[pool])[0]
+    return result
+
+def set_slow_ramp_time(api, pool, seconds):
+    api.LocalLB.Pool.set_slow_ramp_time(pool_names=[pool], values=[seconds])
+
+def get_action_on_service_down(api, pool):
+    result = api.LocalLB.Pool.get_action_on_service_down(pool_names=[pool])[0]
+    result = result.split("SERVICE_DOWN_ACTION_")[-1].lower()
+    return result
+
+def set_action_on_service_down(api, pool, action):
+    action = "SERVICE_DOWN_ACTION_%s" % action.strip().upper()
+    api.LocalLB.Pool.set_action_on_service_down(pool_names=[pool], actions=[action])
+
 def member_exists(api, pool, address, port):
     # hack to determine if member exists
     result = False
@@ -175,24 +277,45 @@ def delete_node_address(api, address):
 def remove_pool_member(api, pool, address, port):
     members = [{'address': address, 'port': port}]
     api.LocalLB.Pool.remove_member_v2(pool_names=[pool], members=[members])
-    return True
 
 def add_pool_member(api, pool, address, port):
     members = [{'address': address, 'port': port}]
     api.LocalLB.Pool.add_member_v2(pool_names=[pool], members=[members])
-    return True
 
 def main():
+    lb_method_choices = ['round_robin', 'ratio_member',
+                         'least_connection_member', 'observed_member',
+                         'predictive_member', 'ratio_node_address',
+                         'least_connection_node_address',
+                         'fastest_node_address', 'observed_node_address',
+                         'predictive_node_address', 'dynamic_ratio',
+                         'fastest_app_response', 'least_sessions',
+                         'dynamic_ratio_member', 'l3_addr', 'unknown',
+                         'weighted_least_connection_member',
+                         'weighted_least_connection_node_address',
+                         'ratio_session', 'ratio_least_connection_member',
+                         'ratio_least_connection_node_address']
+
+    monitor_type_choices = ['and_list', 'm_of_n']
+
+    service_down_choices = ['none', 'reset', 'drop', 'reselect']
+
     module = AnsibleModule(
         argument_spec = dict(
-            server    = dict(required=True),
-            user      = dict(required=True),
-            password  = dict(required=True),
-            state     = dict(default='present', choices=['present', 'absent']),
-            name      = dict(required=True, aliases=['pool']),
-            partition = dict(default='Common'),
-            host      = dict(required=True),
-            port      = dict(required=True)
+            server = dict(type='str', required=True),
+            user = dict(type='str', required=True),
+            password = dict(type='str', required=True),
+            state = dict(type='str', default='present', choices=['present', 'absent']),
+            name = dict(type='str', required=True, aliases=['pool']),
+            partition = dict(type='str', default='Common'),
+            lb_method = dict(type='str', choices=lb_method_choices),
+            monitor_type = dict(type='str', choices=monitor_type_choices),
+            quorum = dict(type='int'),
+            monitors = dict(type='list'),
+            slow_ramp_time = dict(type='int'),
+            service_down_action = dict(type='str', choices=service_down_choices),
+            host = dict(type='str', aliases=['address']),
+            port = dict(type='int')
         ),
         supports_check_mode=True
     )
@@ -206,34 +329,113 @@ def main():
     state = module.params['state']
     name = module.params['name']
     partition = module.params['partition']
+    pool = "/%s/%s" % (partition, name)
+    lb_method = module.params['lb_method']
+    if lb_method:
+        lb_method = lb_method.lower()
+    monitor_type = module.params['monitor_type']
+    if monitor_type:
+        monitor_type = monitor_type.lower()
+    quorum = module.params['quorum']
+    monitors = module.params['monitors']
+    slow_ramp_time = module.params['slow_ramp_time']
+    service_down_action = module.params['service_down_action']
+    if service_down_action:
+        service_down_action = service_down_action.lower()
     host = module.params['host']
-    port = module.params['port']
     address = "/%s/%s" % (partition, host)
-    pool = "/%s/%s" % (partition, name)
+    port = module.params['port']
+
+    # sanity check user supplied values
+
+    if (host and not port) or (port and not host):
+        module.fail_json(msg="both host and port must be supplied")
+
+    if 1 > port > 65535:
+        module.fail_json(msg="valid ports must be in range 1 - 65535")
+
+    if monitors:
+        if len(monitors) == 1:
+            # set default required values for single monitor
+            quorum = 0
+            monitor_type = 'single'
+        elif len(monitors) > 1:
+            if not monitor_type:
+                module.fail_json(msg="monitor_type required for monitors > 1")
+            if monitor_type == 'm_of_n' and not quorum:
+                module.fail_json(msg="quorum value required for monitor_type m_of_n")
+            if monitor_type != 'm_of_n':
+                quorum = 0
+    elif monitor_type:
+        # no monitors specified but monitor_type exists
+        module.fail_json(msg="monitor_type require monitors parameter")
+    elif quorum is not None:
+        # no monitors specified but quorum exists
+        module.fail_json(msg="quorum requires monitors parameter")
 
     try:
         api = bigip_api(server, user, password)
-        if not pool_exists(api, pool):
-            module.fail_json(msg="non-existent pool: %s" % pool)
+        result = {'changed': False}  # default
+
         if state == 'absent':
-            if member_exists(api, pool, address, port):
-                if module.check_mode:
-                    result = {'changed': True}
-                else:
-                    changed = remove_pool_member(api, pool, address, port)
-                    deleted = delete_node_address(api, address)
-                    result = {'changed': changed, 'deleted': deleted}
-            else:
-                result = {'changed': False}
+            if host and port and pool:
+                # member removal takes precedent
+                if pool_exists(api, pool) and member_exists(api, pool, address, port):
+                    if not module.check_mode:
+                        remove_pool_member(api, pool, address, port)
+                        deleted = delete_node_address(api, address)
+                        result = {'changed': True, 'deleted': deleted}
+                    else:
+                        result = {'changed': True}
+            elif pool_exists(api, pool):
+                # no host/port supplied, must be pool removal
+                if not module.check_mode:
+                    remove_pool(api, pool)
+                result = {'changed': True}
+
         elif state == 'present':
-            if not member_exists(api, pool, address, port):
-                if module.check_mode:
-                    result = {'changed': True}
-                else:
-                    changed = add_pool_member(api, pool, address, port)
-                    result = {'changed': changed}
+            if not pool_exists(api, pool):
+                # pool does not exist -- need to create it
+                if not module.check_mode:
+                    # create requires lb_method but we don't want to default
+                    # to a value on subsequent runs
+                    if not lb_method:
+                        lb_method = 'round_robin'
+                    create_pool(api, pool, lb_method)
+                    if monitors:
+                        set_monitors(api, pool, monitor_type, quorum, monitors)
+                    if slow_ramp_time:
+                        set_slow_ramp_time(api, pool, slow_ramp_time)
+                    if service_down_action:
+                        set_action_on_service_down(api, pool, service_down_action)
+                    if host and port:
+                        add_pool_member(api, pool, address, port)
+                result = {'changed': True}
             else:
-                result = {'changed': False}
+                # pool exists -- potentially modify attributes
+                if lb_method and lb_method != get_lb_method(api, pool):
+                    if not module.check_mode:
+                        set_lb_method(api, pool, lb_method)
+                    result = {'changed': True}
+                if monitors:
+                    t_monitor_type, t_quorum, t_monitor_templates = get_monitors(api, pool)
+                    if (t_monitor_type != monitor_type) or (t_quorum != quorum) or (set(t_monitor_templates) != set(monitors)):
+                        if not module.check_mode:
+                            set_monitors(api, pool, monitor_type, quorum, monitors)
+                        result = {'changed': True}
+                if slow_ramp_time and slow_ramp_time != get_slow_ramp_time(api, pool):
+                    if not module.check_mode:
+                        set_slow_ramp_time(api, pool, slow_ramp_time)
+                    result = {'changed': True}
+                if service_down_action and service_down_action != get_action_on_service_down(api, pool):
+                    if not module.check_mode:
+                        set_action_on_service_down(api, pool, service_down_action)
+                    result = {'changed': True}
+                if (host and port) and not member_exists(api, pool, address, port):
+                    if not module.check_mode:
+                        add_pool_member(api, pool, address, port)
+                    result = {'changed': True}
+
     except Exception, e:
         module.fail_json(msg="received exception: %s" % e)