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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.
#
# -------------------------------------------------------------------------
#
import json
from valet.engine.resource_manager.resource import Resource
from valet.engine.resource_manager.resources.group_rule import GroupRule
from valet.engine.resource_manager.resources.host_group import HostGroup
class ResourceHandler:
"""Handler for dealing with all existing datacenters and their resources."""
def __init__(self, _tid, _dbh, _compute, _metadata, _topology,
_config, _logger):
self.end_of_process = False
self.dbh = _dbh
self.compute = _compute
self.metadata = _metadata
self.topology = _topology
self.default_cpu_allocation_ratio = _config.get("default_cpu_allocation_ratio")
self.default_ram_allocation_ratio = _config.get("default_ram_allocation_ratio")
self.default_disk_allocation_ratio = _config.get("default_disk_allocation_ratio")
self.batch_sync_interval = _config.get("batch_sync_interval")
self.group_rules = {}
self.resource_list = []
self.logger = _logger
def load_group_rules_from_db(self):
"""Get all defined valet group rules from DB.
Note that rules are applied to all datacenters.
"""
# Init first
self.group_rules = {}
rule_list = self.dbh.get_group_rules()
if rule_list is None:
return None
for r in rule_list:
rule = GroupRule(r.get("id"))
rule.status = r.get("status")
rule.app_scope = r.get("app_scope")
rule.rule_type = r.get("type")
rule.level = r.get("level")
rule.members = json.loads(r.get("members"))
rule.desc = r.get("description")
self.group_rules[rule.rule_id] = rule
return "ok"
def load_group_rule_from_db(self, _id):
"""Get valet group rule from DB."""
# Init first
self.group_rules = {}
r = self.dbh.get_group_rule(_id)
if r is None:
return None
elif len(r) == 0:
return "rule not found"
rule = GroupRule(r.get("id"))
rule.status = r.get("status")
rule.app_scope = r.get("app_scope")
rule.rule_type = r.get("type")
rule.level = r.get("level")
rule.members = json.loads(r.get("members"))
rule.desc = r.get("description")
self.group_rules[rule.rule_id] = rule
return "ok"
def create_group_rule(self, _name, _scope, _type, _level, _members, _desc):
"""Create a new group rule in DB."""
r = self.dbh.get_group_rule(_name)
if r is None:
return None
elif len(r) > 0:
return "rule already exists"
if not self.dbh.create_group_rule(_name, _scope, _type, _level,
_members, _desc):
return None
return "ok"
def get_rules(self):
"""Return basic info of valet rules."""
rule_list = []
valet_group_list = self.dbh.get_valet_groups()
if valet_group_list is None:
return None
for rk, rule in self.group_rules.iteritems():
rule_info = self._get_rule(rule)
for vg in valet_group_list:
if vg["rule_id"] == rk:
gk = vg.get("id")
gk_elements = gk.split(":")
dc_id = gk_elements[0]
if dc_id not in rule_info["regions"]:
rule_info["regions"].append(dc_id)
rule_list.append(rule_info)
return rule_list
def _get_rule(self, _rule):
"""Return rule info."""
rule_info = {}
rule_info["id"] = _rule.rule_id
rule_info["type"] = _rule.rule_type
rule_info["app_scope"] = _rule.app_scope
rule_info["level"] = _rule.level
rule_info["members"] = _rule.members
rule_info["description"] = _rule.desc
rule_info["status"] = _rule.status
rule_info["regions"] = []
return rule_info
def get_placements_under_rule(self, _rule_name, _resource):
"""Get server placements info under given rule in datacenter."""
placements = {}
rule = self.group_rules[_rule_name]
for gk, g in _resource.groups.iteritems():
if g.factory == "valet":
if g.rule.rule_id == _rule_name:
placements[gk] = self._get_placements(g, _resource)
result = {}
result["id"] = rule.rule_id
result["type"] = rule.rule_type
result["app_scope"] = rule.app_scope
result["level"] = rule.level
result["members"] = rule.members
result["description"] = rule.desc
result["status"] = rule.status
result["placements"] = placements
return result
def _get_placements(self, _g, _resource):
"""Get placement info of servers in group."""
placements = {}
for hk, server_list in _g.member_hosts.iteritems():
for s_info in server_list:
sid = s_info.get("stack_name") + ":" + s_info.get("name")
placements[sid] = {}
placements[sid]["region"] = _resource.datacenter_id
if hk in _resource.hosts.keys():
host = _resource.hosts[hk]
placements[sid]["host"] = host.name
hg = host.host_group
if isinstance(hg, HostGroup) and hg.host_type == "rack":
placements[sid]["rack"] = hg.name
else:
placements[sid]["rack"] = "na"
az = host.get_availability_zone()
az_name_elements = az.name.split(':', 1)
if len(az_name_elements) > 1:
az_name = az_name_elements[1]
else:
az_name = az.name
placements[sid]["availability-zone"] = az_name
elif hk in _resource.host_groups.keys():
hg = _resource.host_groups[hk]
if hg.host_type == "rack":
placements[sid]["rack"] = hg.name
for hhk, host in hg.child_resources.iteritems():
if host.has_server(s_info):
placements[sid]["host"] = host.name
az = host.get_availability_zone()
az_name_elements = az.name.split(':', 1)
if len(az_name_elements) > 1:
az_name = az_name_elements[1]
else:
az_name = az.name
placements[sid]["availability-zone"] = az_name
break
else:
# TODO(Gueyoung): Look for az, rack and host
placements[sid]["availability-zone"] = "na"
placements[sid]["rack"] = "na"
placements[sid]["host"] = "na"
else:
placements[sid]["availability-zone"] = "na"
placements[sid]["rack"] = "na"
placements[sid]["host"] = "na"
return placements
def load_resource(self, _datacenter):
"""Create a resource for placement decisions
in a given target datacenter.
"""
# Init first
del self.resource_list[:]
resource = Resource(_datacenter, self.dbh,
self.compute, self.metadata, self.topology,
self.logger)
resource.set_config(self.default_cpu_allocation_ratio,
self.default_ram_allocation_ratio,
self.default_disk_allocation_ratio)
resource.set_group_rules(self.group_rules)
status = resource.load_resource_from_db()
if status is None:
return False
elif status != "ok":
self.logger.warning(status)
resource.new = True
self.resource_list.append(resource)
return True
def load_resource_with_rule(self, _datacenter):
"""Create and return a resource with valet group rule."""
# Init first
del self.resource_list[:]
resource = Resource(_datacenter, self.dbh,
self.compute, self.metadata, self.topology,
self.logger)
resource.set_config(self.default_cpu_allocation_ratio,
self.default_ram_allocation_ratio,
self.default_disk_allocation_ratio)
resource.set_group_rules(self.group_rules)
status = resource.load_resource_from_db()
if status is None:
return None
elif status != "ok":
return status
self.resource_list.append(resource)
return "ok"
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