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#
# -------------------------------------------------------------------------
# Copyright (C) 2021 Wipro Limited.
#
# 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 copy
import etcd3
from grpc import RpcError
import json
from oslo_config import cfg
from conductor.common.etcd.utils import EtcdClientException
from conductor.common.etcd.utils import validate_schema
CONF = cfg.CONF
ETCD_API_OPTS = [
cfg.StrOpt('host',
default='localhost',
help='host/ip for etcd'),
cfg.StrOpt('port',
default='2379',
help='port for etcd'),
cfg.StrOpt('username',
default='root',
help='Username for authentication'),
cfg.StrOpt('password',
default='root',
help='Password for authentication'),
]
CONF.register_opts(ETCD_API_OPTS, group='etcd_api')
class EtcdAPI(object):
def __init__(self):
self.host = CONF.etcd_api.host
self.port = CONF.etcd_api.port
self.user = CONF.etcd_api.username
self.password = CONF.etcd_api.password
def get_client(self):
try:
return etcd3.client(host=self.host, port=self.port,
user=self.user, password=self.password,
grpc_options={
'grpc.http2.true_binary': 1,
'grpc.http2.max_pings_without_data': 0,
}.items())
except RpcError as rpc_error:
raise EtcdClientException("Failed to establish connection with ETCD. GRPC {}".format(rpc_error.code()))
def get_raw_value(self, key):
return self.get_client().get(key)[0]
def get_value(self, key):
raw_value = self.get_raw_value(key)
if raw_value:
return json.loads(raw_value)
return None
def get_values_prefix(self, key_prefix, filter_name=None, filter_value=None):
values = {kv[1].key.decode().lstrip(key_prefix): json.loads(kv[0])
for kv in self.get_client().get_prefix(key_prefix)}
if not filter_name or not filter_value:
return values
return dict(filter(lambda x: x[1].get(filter_name) == filter_value, values.items()))
def validate_row(self, keyspace, table, values):
key = f'{keyspace}/{table}'
schema = json.loads(self.get_client().get(key)[0])
return validate_schema(values, schema)
def keyspace_create(self, keyspace):
self.get_client().put_if_not_exists(keyspace, "This key is a placeholder for the keyspace".encode())
def keyspace_delete(self, keyspace):
self.get_client().delete_prefix(keyspace)
def table_create(self, keyspace, table, schema):
table_key = '{}/{}'.format(keyspace, table)
table_value = json.dumps(schema)
self.get_client().put_if_not_exists(table_key, table_value)
def table_delete(self, keyspace, table):
table_key = '{}/{}'.format(keyspace, table)
self.get_client().delete_prefix(table_key)
def row_create(self, keyspace, table, pk_name, pk_value, values, atomic=False, conditional=True):
key = f'{keyspace}/{table}/{pk_value}'
values[pk_name] = pk_value
if self.validate_row(keyspace, table, values):
put_response = self.get_client().put(key, json.dumps(values))
return "SUCCESS" if put_response else "FAILURE"
return "FAILURE"
def row_update(self, keyspace, table, pk_name, pk_value, values, atomic=False, condition=True):
key = f'{keyspace}/{table}/{pk_value}'
values[pk_name] = pk_value
client = self.get_client()
if client.get(key) and self.validate_row(keyspace, table, values):
put_response = client.put(key, json.dumps(values))
return "SUCCESS" if put_response else "FAILURE"
return "FAILURE"
def row_read(self, keyspace, table, pk_name=None, pk_value=None):
schema = self.get_value(f'{keyspace}/{table}')
if pk_name and pk_value and schema["PRIMARY KEY"] == f'({pk_name})':
key = f'{keyspace}/{table}/{pk_value}'
return {pk_value: self.get_value(key)}
key_prefix = f'{keyspace}/{table}/'
return self.get_values_prefix(key_prefix, pk_name, pk_value)
def row_delete(self, keyspace, table, pk_name, pk_value, atomic=False):
key = f'{keyspace}/{table}/{pk_value}'
self.get_client().delete(key)
def row_insert_by_condition(self, keyspace, table, pk_name, pk_value, values, exists_status):
key = f'{keyspace}/{table}/{pk_value}'
values[pk_name] = pk_value
exists_values = copy.deepcopy(values)
exists_values["status"] = exists_status
client = self.get_client()
client.transaction(
compare=[
client.transactions.version(key) > 0,
],
success=[
client.transactions.put(key, json.dumps(exists_values))
],
failure=[
client.transactions.put(key, json.dumps(values))
]
)
def row_complex_field_update(self, keyspace, table, pk_name, pk_value, plan_id, updated_fields, values):
key = f'{keyspace}/{table}/{pk_value}'
value = self.get_value(key)
plans = value.get('plans')
plans.put(plan_id, updated_fields)
value.put('plans', plans)
self.get_client().put(key, value)
def index_create(self, keyspace, table, index):
# Since index is irrelevant in a KV store, this method will do nothing
pass
def lock_create(self, keyspace, table, pk_value):
lock_name = f'{keyspace}.{table}.{pk_value}'
return self.get_client().lock(lock_name)
def lock_acquire(self, lock):
return lock.acquire()
def lock_delete(self, lock):
return lock.release()
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