164 lines
5.7 KiB
Python
164 lines
5.7 KiB
Python
# Copyright (c) 2013 Mirantis Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import base64
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import json
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import os
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import shutil
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import time
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from cryptography.hazmat import backends
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from cryptography.hazmat.primitives.asymmetric import padding
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from cryptography.hazmat.primitives import hashes
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from cryptography.hazmat.primitives import serialization
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from oslo_log import log as logging
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from muranoagent import bunch
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from muranoagent.common import config
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CONF = config.CONF
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LOG = logging.getLogger(__name__)
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class ExecutionPlanQueue(object):
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plan_filename = 'plan.json'
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result_filename = 'result.json'
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stamp_filename = 'stamp'
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def __init__(self):
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self._plans_folder = os.path.join(CONF.storage, 'plans')
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if not os.path.exists(self._plans_folder):
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os.makedirs(self._plans_folder, 0o700)
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else:
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try:
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os.chmod(self._plans_folder, 0o700)
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except OSError:
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pass
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self._key = None if not CONF.engine_key \
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else serialization.load_pem_public_key(
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CONF.engine_key, backends.default_backend())
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self._load_stamp()
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def put_execution_plan(self, execution_plan, signature, msg_id, reply_to):
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timestamp = str(int(time.time() * 10000))
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# execution_plan['_timestamp'] = timestamp
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folder_path = os.path.join(self._plans_folder, timestamp)
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os.mkdir(folder_path)
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plan_file_path = os.path.join(
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folder_path, ExecutionPlanQueue.plan_filename)
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with open(plan_file_path, 'wb') as out_file:
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out_file.write(json.dumps({
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'Data': base64.b64encode(execution_plan),
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'Signature': base64.b64encode(signature or ''),
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'ID': msg_id,
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'ReplyTo': reply_to
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}))
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def _get_first_timestamp(self, filename):
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def predicate(folder):
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path = os.path.join(self._plans_folder, folder, filename)
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return os.path.exists(path)
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timestamps = [
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name for name in os.listdir(self._plans_folder)
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if predicate(name)
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]
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timestamps.sort()
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return None if len(timestamps) == 0 else timestamps[0]
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def _get_first_file(self, filename):
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timestamp = self._get_first_timestamp(filename)
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if not timestamp:
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return None, None
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path = os.path.join(self._plans_folder, timestamp, filename)
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with open(path) as json_file:
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return json.loads(json_file.read()), timestamp
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def get_execution_plan(self):
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while True:
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ep_info, timestamp = self._get_first_file(
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ExecutionPlanQueue.plan_filename)
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if ep_info is None:
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return None
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try:
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data = base64.b64decode(ep_info['Data'])
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if self._key:
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signature = base64.b64decode(ep_info['Signature'])
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self._verify_signature(data, signature)
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ep = json.loads(data)
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if not isinstance(ep, dict):
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raise ValueError('Message is not a document')
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stamp = ep.get('Stamp', -1)
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if stamp >= 0:
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if stamp <= self._last_stamp:
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raise ValueError('Dropping old/duplicate message')
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self._save_stamp(stamp)
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if 'ID' not in ep:
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ep['ID'] = ep_info['ID']
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if 'ReplyTo' not in ep:
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ep['ReplyTo'] = ep_info['ReplyTo']
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ep['_timestamp'] = timestamp
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return bunch.Bunch(ep)
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except Exception as ex:
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LOG.exception(ex)
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self.remove(timestamp)
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def _verify_signature(self, data, signature):
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if not signature:
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raise ValueError("Required signature was not found")
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self._key.verify(
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signature,
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CONF.rabbitmq.input_queue + data,
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padding.PKCS1v15(), hashes.SHA256())
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def put_execution_result(self, result, execution_plan):
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timestamp = execution_plan['_timestamp']
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if 'ReplyTo' in execution_plan:
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result['ReplyTo'] = execution_plan.get('ReplyTo')
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path = os.path.join(
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self._plans_folder, timestamp,
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ExecutionPlanQueue.result_filename)
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with open(path, 'w') as out_file:
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out_file.write(json.dumps(result))
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def remove(self, timestamp):
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path = os.path.join(self._plans_folder, timestamp)
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shutil.rmtree(path)
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def get_execution_plan_result(self):
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return self._get_first_file(
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ExecutionPlanQueue.result_filename)
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def _load_stamp(self):
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plan_file_path = os.path.join(
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self._plans_folder, ExecutionPlanQueue.stamp_filename)
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if os.path.exists(plan_file_path):
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with open(plan_file_path) as f:
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self._last_stamp = int(f.read())
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else:
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self._last_stamp = 0
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def _save_stamp(self, stamp):
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plan_file_path = os.path.join(
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self._plans_folder, ExecutionPlanQueue.stamp_filename)
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with open(plan_file_path, 'w') as f:
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f.write(str(stamp))
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self._last_stamp = stamp
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