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#
# -------------------------------------------------------------------------
# Copyright (c) 2019 AT&T Intellectual Property
#
# 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.
#
# -------------------------------------------------------------------------
#
#!/bin/python
import copy
import re
from valet.engine.resource_manager.resources.host_group import HostGroup
class Naming(object):
"""Using cannonical naming convention to capture datacenter layout."""
def __init__(self, _config, _logger):
self.logger = _logger
self.rack_code_list = _config.get("rack_codes")
self.host_code_list = _config.get("host_codes")
def isdigit(char):
return "0" <= char <= "9"
def get_topology(self, _datacenter, _host_groups, _hosts, _rhosts):
"""Set datacenter resource structure (racks, hosts)."""
status = "ok"
for rhk, rhost in _rhosts.iteritems():
h = copy.deepcopy(rhost)
(rack_name, parsing_status) = self._set_layout_by_name(rhk)
if parsing_status != "ok":
self.logger.warning(parsing_status + " in host_name (" + rhk + ")")
if rack_name == "none":
h.host_group = _datacenter
_datacenter.resources[rhk] = h
else:
if rack_name not in _host_groups.keys():
host_group = HostGroup(rack_name)
host_group.host_type = "rack"
_host_groups[host_group.name] = host_group
else:
host_group = _host_groups[rack_name]
h.host_group = host_group
host_group.child_resources[rhk] = h
_hosts[h.name] = h
for hgk, hg in _host_groups.iteritems():
hg.parent_resource = _datacenter
_datacenter.resources[hgk] = hg
if "none" in _host_groups.keys():
self.logger.warning("some hosts are into unknown rack")
return status
def _set_layout_by_name(self, _host_name):
"""Set the rack-host layout, use host nameing convention.
Naming convention includes
zone name is any word followed by at least one of [0-9]
rack name is rack_code followd by at least one of [0-9]
host name is host_code followed by at least one of [0-9]
an example is
'abcd_001A' (as a zone_name) +
'r' (as a rack_code) + '01A' +
'c' (as a host_code) + '001A'
"""
zone_name = None
rack_name = None
host_name = None
# To check if zone name follows the rule
index = 0
for c in _host_name:
if isdigit(c):
break
index += 1
zone_indicator = _host_name[index:]
if len(zone_indicator) == 0:
return 'none', "no numberical digit in name"
# To extract rack indicator
for rack_code in self.rack_code_list:
rack_index_list = [rc.start() for rc in re.finditer(rack_code, zone_indicator)]
start_of_rack_index = -1
for rack_index in rack_index_list:
rack_prefix = rack_index + len(rack_code)
if rack_prefix > len(zone_indicator):
continue
# Once rack name follows the rule
if isdigit(zone_indicator[rack_prefix]):
rack_indicator = zone_indicator[rack_prefix:]
# To extract host indicator
for host_code in self.host_code_list:
host_index_list = [hc.start() for hc in re.finditer(host_code, rack_indicator)]
start_of_host_index = -1
for host_index in host_index_list:
host_prefix = host_index + len(host_code)
if host_prefix > len(rack_indicator):
continue
if isdigit(rack_indicator[host_prefix]):
host_name = rack_indicator[host_index:]
start_of_host_index = rack_index + host_index + 1
break
if host_name is not None:
rack_name = zone_indicator[rack_index:start_of_host_index]
break
if rack_name is not None:
start_of_rack_index = index + rack_index
break
if rack_name is not None:
zone_name = _host_name[:start_of_rack_index]
break
if rack_name is None:
return 'none', "no host or rack name found in " + _host_name
else:
return zone_name + rack_name, "ok"
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