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+# Copyright 2014 Huawei Technologies Co. Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Module to provider function to poll switch."""
+import logging
+import netaddr
+
+from compass.actions import util
+from compass.db.api import database
+from compass.db.api import switch as switch_api
+from compass.db.api import user as user_api
+from compass.hdsdiscovery.hdmanager import HDManager
+
+
+def _poll_switch(ip_addr, credentials, req_obj='mac', oper="SCAN"):
+ """Poll switch by ip addr.
+
+
+ Args:
+ ip_addr: ip addr of the switch.
+ credentials: credentials of the switch.
+
+ Returns: switch attributes dict and list of machine attributes dict.
+ """
+ under_monitoring = 'under_monitoring'
+ unreachable = 'unreachable'
+ polling_error = 'error'
+ hdmanager = HDManager()
+ vendor, state, err_msg = hdmanager.get_vendor(ip_addr, credentials)
+ if not vendor:
+ logging.info("*****error_msg: %s****", err_msg)
+ logging.error('no vendor found or match switch %s', ip_addr)
+ return (
+ {
+ 'vendor': vendor, 'state': state, 'err_msg': err_msg
+ }, {
+ }
+ )
+
+ logging.debug(
+ 'hdmanager learn switch from %s', ip_addr
+ )
+ results = []
+ try:
+ results = hdmanager.learn(
+ ip_addr, credentials, vendor, req_obj, oper
+ )
+ except Exception as error:
+ logging.exception(error)
+ state = unreachable
+ err_msg = (
+ 'SNMP walk for querying MAC addresses timedout'
+ )
+ return (
+ {
+ 'vendor': vendor, 'state': state, 'err_msg': err_msg
+ }, {
+ }
+ )
+
+ logging.info("pollswitch %s result: %s", ip_addr, results)
+ if not results:
+ logging.error(
+ 'no result learned from %s', ip_addr
+ )
+ state = polling_error
+ err_msg = 'No result learned from SNMP walk'
+ return (
+ {'vendor': vendor, 'state': state, 'err_msg': err_msg},
+ {}
+ )
+
+ logging.info('poll switch result: %s' % str(results))
+ machine_dicts = {}
+ for machine in results:
+ mac = machine['mac']
+ port = machine['port']
+ vlan = int(machine['vlan'])
+ if vlan:
+ vlans = [vlan]
+ else:
+ vlans = []
+ if mac not in machine_dicts:
+ machine_dicts[mac] = {'mac': mac, 'port': port, 'vlans': vlans}
+ else:
+ machine_dicts[mac]['port'] = port
+ machine_dicts[mac]['vlans'].extend(vlans)
+
+ logging.debug('update switch %s state to under monitoring', ip_addr)
+ state = under_monitoring
+ return (
+ {'vendor': vendor, 'state': state, 'err_msg': err_msg},
+ machine_dicts.values()
+ )
+
+
+def poll_switch(poller_email, ip_addr, credentials,
+ req_obj='mac', oper="SCAN"):
+ """Query switch and update switch machines.
+
+ .. note::
+ When polling switch succeeds, for each mac it got from polling switch,
+ A Machine record associated with the switch is added to the database.
+
+ :param ip_addr: switch ip address.
+ :type ip_addr: str
+ :param credentials: switch crednetials.
+ :type credentials: dict
+ :param req_obj: the object requested to query from switch.
+ :type req_obj: str
+ :param oper: the operation to query the switch.
+ :type oper: str, should be one of ['SCAN', 'GET', 'SET']
+
+ .. note::
+ The function should be called out of database session scope.
+ """
+ poller = user_api.get_user_object(poller_email)
+ ip_int = long(netaddr.IPAddress(ip_addr))
+ with util.lock('poll switch %s' % ip_addr, timeout=120) as lock:
+ if not lock:
+ raise Exception(
+ 'failed to acquire lock to poll switch %s' % ip_addr
+ )
+
+ # TODO(grace): before repoll the switch, set the state to repolling.
+ # and when the poll switch is timeout, set the state to error.
+ # the frontend should only consider some main state like INTIALIZED,
+ # ERROR and SUCCESSFUL, REPOLLING is as an intermediate state to
+ # indicate the switch is in learning the mac of the machines connected
+ # to it.
+ logging.debug('poll switch: %s', ip_addr)
+ switch_dict, machine_dicts = _poll_switch(
+ ip_addr, credentials, req_obj=req_obj, oper=oper
+ )
+ switches = switch_api.list_switches(ip_int=ip_int, user=poller)
+ if not switches:
+ logging.error('no switch found for %s', ip_addr)
+ return
+
+ for switch in switches:
+ for machine_dict in machine_dicts:
+ logging.info('add machine: %s', machine_dict)
+ machine_dict['owner_id'] = poller.id
+ switch_api.add_switch_machine(
+ switch['id'], False, user=poller, **machine_dict
+ )
+ switch_api.update_switch(
+ switch['id'],
+ user=poller,
+ **switch_dict
+ )