Implement BIGIP F5 TCP monitor

library/net_infrastructure/bigip_monitor_tcp

+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# (c) 2013, serge van Ginderachter <serge@vanginderachter.be>
+#
+# 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: bigip_monitor_tcp
+short_description: "Manages F5 BIG-IP LTM tcp monitors"
+description:
+    - "Manages F5 BIG-IP LTM tcp monitors via iControl SOAP API"
+version_added: "1.4"
+author: Serge van Ginderachter
+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"
+    - "Monitor API documentation: https://devcentral.f5.com/wiki/iControl.LocalLB__Monitor.ashx" TODO
+requirements:
+    - bigsuds
+options:
+    server:
+        description:
+            - BIG-IP host
+        required: true
+        default: null
+    user:
+        description:
+            - BIG-IP username
+        required: true
+        default: null
+    password:
+        description:
+            - BIG-IP password
+        required: true
+        default: null
+    state:
+        description:
+            - Monitor state
+        required: false
+        default: 'present'
+        choices: ['present', 'absent']
+    name:
+        description:
+            - Monitor name
+        required: true
+        default: null
+        aliases: ['monitor']
+    partition:
+        description:
+            - Partition for the monitor
+        required: false
+        default: 'Common'
+    type:
+        description:
+            - The template type of this monitor template
+        required: false
+        default: 'tcp'
+        choices: [ 'TTYPE_TCP', 'TTYPE_TCP_ECHO', 'TTYPE_TCP_HALF_OPEN']
+    parent:
+        description:
+            - The parent template of this monitor template
+        required: false
+        default: 'tcp'
+        choices: [ 'tcp', 'tcp_echo', 'tcp_half_open']
+    parent_partition:
+        description:
+            - Partition for the parent monitor
+        required: false
+        default: 'Common'
+    send:
+        description:
+            - The send string for the monitor call
+        required: true
+        default: none
+    receive:
+        description:
+            - The receive string for the monitor call
+        required: true
+        default: none
+    ip:
+        description: 
+            - IP address part of the ipport definition. The default API setting
+              is "0.0.0.0".
+        required: false
+        default: none
+    port:
+        description: 
+            - port address part op the ipport definition. Tyhe default API
+              setting is 0.
+        required: false
+        default: none
+    interval:
+        description: 
+            - The interval specifying how frequently the monitor instance
+              of this template will run. By default, this interval is used for up and
+              down states. The default API setting is 5.
+        required: false
+        default: none
+    timeout:
+        description:
+            - The number of seconds in which the node or service must respond to
+              the monitor request. If the target responds within the set time
+              period, it is considered up. If the target does not respond within
+              the set time period, it is considered down. You can change this
+              number to any number you want, however, it should be 3 times the
+              interval number of seconds plus 1 second. The default API setting
+              is 16.
+        required: false
+        default: none
+    time_until_up:
+        description:
+            - Specifies the amount of time in seconds after the first successful
+              response before a node will be marked up. A value of 0 will cause a
+              node to be marked up immediately after a valid response is received
+              from the node. The default API setting is 0.
+        required: false
+        default: none
+'''
+
+EXAMPLES = '''
+
+'''
+
+try:
+    import bigsuds
+except ImportError:
+    bigsuds_found = False
+else:
+    bigsuds_found = True
+
+TEMPLATE_TYPE = DEFAULT_TEMPLATE_TYPE = 'TTYPE_TCP'
+TEMPLATE_TYPE_CHOICES = ['tcp', 'tcp_echo', 'tcp_half_open']
+DEFAULT_PARENT = DEFAULT_TEMPLATE_TYPE_CHOICE = DEFAULT_TEMPLATE_TYPE.replace('TTYPE_', '').lower()
+
+
+# ===========================================
+# bigip_monitor module generic methods.
+# these should be re-useable for other monitor types
+#
+
+def bigip_api(bigip, user, password):
+
+    api = bigsuds.BIGIP(hostname=bigip, username=user, password=password)
+    return api
+
+
+def check_monitor_exists(module, api, monitor, parent):
+
+    # hack to determine if monitor exists
+    result = False
+    try:
+        ttype = api.LocalLB.Monitor.get_template_type(template_names=[monitor])[0]
+        parent2 = api.LocalLB.Monitor.get_parent_template(template_names=[monitor])[0]
+        if ttype == TEMPLATE_TYPE and parent == parent2:
+            result = True
+        else:
+            module.fail_json(msg='Monitor already exists, but has a different type (%s) or parent(%s)' % (ttype, parent))
+    except bigsuds.OperationFailed, e:
+        if "was not found" in str(e):
+            result = False
+        else:
+            # genuine exception
+            raise
+    return result
+
+
+def create_monitor(api, monitor, template_attributes):
+
+    try: 
+        api.LocalLB.Monitor.create_template(templates=[{'template_name': monitor, 'template_type': TEMPLATE_TYPE}], template_attributes=[template_attributes])
+    except bigsuds.OperationFailed, e:
+        if "already exists" in str(e):
+            return False
+        else:
+            # genuine exception
+            raise
+    return True
+
+
+def delete_monitor(api, monitor):
+
+    try:
+        api.LocalLB.Monitor.delete_template(template_names=[monitor])
+    except bigsuds.OperationFailed, e:
+        # maybe it was deleted since we checked
+        if "was not found" in str(e):
+            return False
+        else:
+            # genuine exception
+            raise
+    return True
+
+
+def check_string_property(api, monitor, str_property):
+
+    return str_property == api.LocalLB.Monitor.get_template_string_property([monitor], [str_property['type']])[0]
+
+
+def set_string_property(api, monitor, str_property):
+
+    api.LocalLB.Monitor.set_template_string_property(template_names=[monitor], values=[str_property])
+
+
+def check_integer_property(api, monitor, int_property):
+
+    return int_property == api.LocalLB.Monitor.get_template_integer_property([monitor], [int_property['type']])[0]
+
+
+def set_integer_property(api, monitor, int_property):
+
+    api.LocalLB.Monitor.set_template_int_property(template_names=[monitor], values=[int_property])
+
+
+def update_monitor_properties(api, module, monitor, template_string_properties, template_integer_properties):
+
+    changed = False
+    for str_property in template_string_properties:
+        if str_property['value'] is not None and not check_string_property(api, monitor, str_property):
+            if not module.check_mode:
+                set_string_property(api, monitor, str_property)
+            changed = True
+    for int_property in template_integer_properties:
+        if int_property['value'] is not None and not check_integer_property(api, monitor, int_property):
+            if not module.check_mode:
+                set_integer_property(api, monitor, int_property)
+            changed = True
+
+    return changed
+
+
+def get_ipport(api, monitor):
+
+    return api.LocalLB.Monitor.get_template_destination(template_names=[monitor])[0]
+
+
+def set_ipport(api, monitor, ipport):
+
+    try:
+        api.LocalLB.Monitor.set_template_destination(template_names=[monitor], destinations=[ipport])
+        return True, ""
+
+    except bigsuds.OperationFailed, e:
+        if "Cannot modify the address type of monitor" in str(e):
+            return False, "Cannot modify the address type of monitor if already assigned to a pool."
+        else:
+            # genuine exception
+            raise
+
+# ===========================================
+# main loop
+#
+# writing a module for other monitor types should 
+# only need an updated main() (and monitor specific functions)
+
+def main():
+
+    # begin monitor specific stuff
+
+    module = AnsibleModule(
+        argument_spec = dict(
+            server    = dict(required=True),
+            user      = dict(required=True),
+            password  = dict(required=True),
+            partition = dict(default='Common'),
+            state     = dict(default='present', choices=['present', 'absent']),
+            name      = dict(required=True),
+            type      = dict(default=DEFAULT_TEMPLATE_TYPE_CHOICE, choices=TEMPLATE_TYPE_CHOICES),
+            parent    = dict(default=DEFAULT_PARENT),
+            parent_partition = dict(default='Common'),
+            send      = dict(required=False),
+            receive   = dict(required=False),
+            ip        = dict(required=False),
+            port      = dict(required=False, type='int'),
+            interval  = dict(required=False, type='int'),
+            timeout   = dict(required=False, type='int'),
+            time_until_up = dict(required=False, type='int', default=0)
+        ),
+        supports_check_mode=True
+    )
+
+    server = module.params['server']
+    user = module.params['user']
+    password = module.params['password']
+    partition = module.params['partition']
+    parent_partition = module.params['parent_partition']
+    state = module.params['state']
+    name = module.params['name']
+    type = 'TTYPE_' + module.params['type'].upper()
+    parent = "/%s/%s" % (parent_partition, module.params['parent'])
+    monitor = "/%s/%s" % (partition, name)
+    send = module.params['send']
+    receive = module.params['receive']
+    ip = module.params['ip']
+    port = module.params['port']
+    interval = module.params['interval']
+    timeout = module.params['timeout']
+    time_until_up = module.params['time_until_up']
+
+    # tcp monitor has multiple types, so overrule
+    global TEMPLATE_TYPE
+    TEMPLATE_TYPE = type
+
+    # end monitor specific stuff
+
+    if not bigsuds_found:
+        module.fail_json(msg="the python bigsuds module is required")
+    api = bigip_api(server, user, password)
+    monitor_exists = check_monitor_exists(module, api, monitor, parent)
+
+
+    # ipport is a special setting
+    if monitor_exists: # make sure to not update current settings if not asked
+        cur_ipport = get_ipport(api, monitor)
+        if ip is None:
+            ip = cur_ipport['ipport']['address']
+        if port is None:
+            port = cur_ipport['ipport']['port']
+    else: # use API defaults if not defined to create it
+        if interval is None:        interval = 5
+        if timeout is None:         timeout = 16
+        if ip is None:              ip = '0.0.0.0'
+        if port is None:            port = 0
+        if send is None:            send = ''
+        if receive is None:         receive = ''
+
+    # define and set address type
+    if ip == '0.0.0.0' and port == 0:
+        address_type = 'ATYPE_STAR_ADDRESS_STAR_PORT'
+    elif ip == '0.0.0.0' and port != 0:
+        address_type = 'ATYPE_STAR_ADDRESS_EXPLICIT_PORT'
+    elif ip != '0.0.0.0' and port != 0:
+        address_type = 'ATYPE_EXPLICIT_ADDRESS_EXPLICIT_PORT'
+    else:
+        address_type = 'ATYPE_UNSET'
+
+    ipport = {'address_type': address_type,
+              'ipport': {'address': ip,
+                         'port': port}}
+
+    template_attributes = {'parent_template': parent,
+                           'interval': interval,
+                           'timeout': timeout,
+                           'dest_ipport': ipport,
+                           'is_read_only': False,
+                           'is_directly_usable': True}
+
+    # monitor specific stuff
+    if type == 'TTYPE_TCP':
+        template_string_properties = [{'type': 'STYPE_SEND',
+                                       'value': send},
+                                      {'type': 'STYPE_RECEIVE',
+                                       'value': receive}]
+    else:
+        template_string_properties = []
+
+    template_integer_properties = [{'type': 'ITYPE_INTERVAL',
+                                     'value': interval},
+                                   {'type': 'ITYPE_TIMEOUT',
+                                    'value': timeout},
+                                   {'type': 'ITYPE_TIME_UNTIL_UP',
+                                    'value': interval}]
+
+    # main logic, monitor generic
+
+    try:
+        result = {'changed': False}  # default
+
+
+        if state == 'absent':
+            if monitor_exists:
+                if not module.check_mode:
+                    # possible race condition if same task 
+                    # on other node deleted it first
+                    result['changed'] |= delete_monitor(api, monitor)
+                else:
+                    result['changed'] |= True
+
+        else: # state present
+            ## check for monitor itself
+            if not monitor_exists: # create it
+                if not module.check_mode: 
+                    # again, check changed status here b/c race conditions
+                    # if other task already created it
+                    result['changed'] |= create_monitor(api, monitor, template_attributes)
+                else: 
+                    result['changed'] |= True
+
+            ## check for monitor parameters
+            # whether it already existed, or was just created, now update
+            # the update functions need to check for check mode but
+            # cannot update settings if it doesn't exist which happens in check mode
+            if monitor_exists and not module.check_mode:
+                result['changed'] |= update_monitor_properties(api, module, monitor,
+                                                               template_string_properties,
+                                                               template_integer_properties)
+            # else assume nothing changed
+
+            # we just have to update the ipport if monitor already exists and it's different
+            if monitor_exists and cur_ipport != ipport:
+                set_ipport(api, monitor, ipport)    
+                result['changed'] |= True
+            #else: monitor doesn't exist (check mode) or ipport is already ok
+
+
+    except Exception, e:
+        module.fail_json(msg="received exception: %s" % e)
+
+    module.exit_json(**result)
+
+# include magic from lib/ansible/module_common.py
+#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
+main()
+