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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.
+
+"""Manage hdsdiscovery functionalities."""
+import logging
+import os
+import re
+
+from compass.hdsdiscovery.error import TimeoutError
+from compass.hdsdiscovery import utils
+from compass.utils import setting_wrapper as setting
+from compass.utils import util
+
+
+UNREACHABLE = 'unreachable'
+NOTSUPPORTED = 'notsupported'
+ERROR = 'error'
+REPOLLING = 'repolling'
+
+
+class HDManager(object):
+ """Process a request."""
+
+ def __init__(self):
+ base_dir = os.path.dirname(os.path.realpath(__file__))
+ self.vendors_dir = os.path.join(base_dir, 'vendors')
+ self.vendor_plugins_dir = os.path.join(self.vendors_dir, '?/plugins')
+ self.snmp_sysdescr = 'sysDescr.0'
+
+ def learn(self, host, credential, vendor, req_obj, oper="SCAN", **kwargs):
+ """Insert/update record of switch_info.
+
+ Get expected results from switch according to sepcific operation.
+
+ :param req_obj: the object of a machine
+ :param host: switch IP address
+ :param credientials: credientials to access switch
+ :param oper: operations of the plugin (SCAN, GETONE, SET)
+ :param kwargs(optional): key-value pairs
+ """
+ plugin_dir = self.vendor_plugins_dir.replace('?', vendor)
+ if not os.path.exists(plugin_dir):
+ logging.error('No such directory: %s', plugin_dir)
+ return None
+
+ plugin = utils.load_module(req_obj, plugin_dir, host, credential)
+ if not plugin:
+ # No plugin found!
+ # TODO(Grace): add more code to catch excpetion or unexpected state
+ logging.error('no plugin %s to load from %s', req_obj, plugin_dir)
+ return None
+
+ return plugin.process_data(oper, **kwargs)
+
+ def is_valid_vendor(self, host, credential, vendor):
+ """Check if vendor is associated with this host and credential
+
+ :param host: switch ip
+ :param credential: credential to access switch
+ :param vendor: the vendor of switch
+ """
+ vendor_dir = os.path.join(self.vendors_dir, vendor)
+ if not os.path.exists(vendor_dir):
+ logging.error('no such directory: %s', vendor_dir)
+ return False
+
+ sys_info, err = self.get_sys_info(host, credential)
+ if not sys_info:
+ logging.debug("[hdsdiscovery][hdmanager][is_valid_vendor]"
+ "failded to get sys information: %s", err)
+ return False
+
+ instance = utils.load_module(vendor, vendor_dir)
+ if not instance:
+ logging.debug("[hdsdiscovery][hdmanager][is_valid_vendor]"
+ "No such vendor found!")
+ return False
+
+ if instance.is_this_vendor(sys_info):
+ logging.info("[hdsdiscovery][hdmanager][is_valid_vendor]"
+ "vendor %s is correct!", vendor)
+ return True
+
+ return False
+
+ def get_vendor(self, host, credential):
+ """Check and get vendor of the switch.
+
+ :param host: switch ip:
+ :param credential: credential to access switch
+ :return a tuple (vendor, switch_state, error)
+ """
+
+ switch_lists = util.load_configs(setting.MACHINE_LIST_DIR)
+ switch_list = []
+ for items in switch_lists:
+ for item in items['MACHINE_LIST']:
+ for k, v in item.items():
+ switch_list.append(k)
+ if host in switch_list:
+ return ("appliance", "Found", "")
+
+ # TODO(grace): Why do we need to have valid IP?
+ # a hostname should also work.
+ if not utils.valid_ip_format(host):
+ logging.error("host '%s' is not valid IP address!", host)
+ return (None, ERROR, "Invalid IP address %s!" % host)
+
+ if not utils.is_valid_snmp_v2_credential(credential):
+ logging.debug("******The credential %s of host %s cannot "
+ "be used for either SNMP v2 or SSH*****",
+ credential, host)
+ return (None, ERROR, "Invalid credential")
+
+ sys_info, err = self.get_sys_info(host, credential)
+ if not sys_info:
+ return (None, UNREACHABLE, err)
+
+ # List all vendors in vendors directory -- a directory but hidden
+ # under ../vendors
+ all_vendors = [o for o in os.listdir(self.vendors_dir)
+ if os.path.isdir(os.path.join(self.vendors_dir, o))
+ and re.match(r'^[^\.]', o)]
+
+ logging.debug("[get_vendor][available vendors]: %s ", all_vendors)
+ logging.debug("[get_vendor] System Information is [%s]", sys_info)
+
+ # TODO(grace): should not conver to lower. The vendor impl can choose
+ # to do case-insensitive match
+ # sys_info = sys_info.lower()
+ vendor = None
+ for vname in all_vendors:
+ vpath = os.path.join(self.vendors_dir, vname)
+ instance = utils.load_module(vname, vpath)
+ if not instance:
+ logging.error('no instance %s load from %s', vname, vpath)
+ continue
+
+ if instance.is_this_vendor(sys_info):
+ logging.info("[get_vendor]****Found vendor '%s'****", vname)
+ vendor = vname
+ break
+
+ if not vendor:
+ logging.debug("[get_vendor] No vendor found! <==================")
+ return (None, NOTSUPPORTED, "Not supported switch vendor!")
+
+ return (vendor, REPOLLING, "")
+
+ def get_sys_info(self, host, credential):
+ """get sys info."""
+ sys_info = None
+ try:
+ sys_info = utils.snmpget_by_cl(host,
+ credential,
+ self.snmp_sysdescr)
+ except TimeoutError as error:
+ return (None, error.message)
+
+ return (sys_info, "")