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#!/usr/bin/env python
# Copyright 2017 Cisco Systems, Inc. All rights reserved.
#
# 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
import Queue
from threading import Thread
import uuid
from flask import Flask
from flask import jsonify
from flask import request
from summarizer import NFVBenchSummarizer
from log import LOG
from utils import byteify
from utils import RunLock
from __init__ import __version__
STATUS_OK = 'OK'
STATUS_ERROR = 'ERROR'
STATUS_PENDING = 'PENDING'
STATUS_NOT_FOUND = 'NOT_FOUND'
def result_json(status, message, request_id=None):
body = {
'status': status,
'error_message': message
}
if request_id is not None:
body['request_id'] = request_id
return body
def load_json(data):
return json.loads(json.dumps(data), object_hook=byteify)
def get_uuid():
return uuid.uuid4().hex
class Ctx(object):
MAXLEN = 5
run_queue = Queue.Queue()
busy = False
result = None
results = {}
ids = []
current_id = None
@staticmethod
def enqueue(config, request_id):
Ctx.busy = True
config['request_id'] = request_id
Ctx.run_queue.put(config)
if len(Ctx.ids) >= Ctx.MAXLEN:
try:
del Ctx.results[Ctx.ids.pop(0)]
except KeyError:
pass
Ctx.ids.append(request_id)
@staticmethod
def dequeue():
config = Ctx.run_queue.get()
Ctx.current_id = config['request_id']
return config
@staticmethod
def release():
Ctx.current_id = None
Ctx.busy = False
@staticmethod
def set_result(res):
res['request_id'] = Ctx.current_id
Ctx.results[Ctx.current_id] = res
Ctx.result = res
@staticmethod
def get_result(request_id=None):
if request_id:
try:
res = Ctx.results[request_id]
except KeyError:
return None
if Ctx.result and request_id == Ctx.result['request_id']:
Ctx.result = None
return res
else:
res = Ctx.result
if res:
Ctx.result = None
return res
@staticmethod
def is_busy():
return Ctx.busy
@staticmethod
def get_current_request_id():
return Ctx.current_id
def setup_flask():
app = Flask(__name__)
busy_json = result_json(STATUS_ERROR, 'there is already an NFVbench request running')
not_busy_json = result_json(STATUS_ERROR, 'no pending NFVbench run')
not_found_msg = 'results not found'
pending_msg = 'NFVbench run still pending'
# --------- HTTP requests ------------
@app.route('/version', methods=['GET'])
def _version():
return __version__
@app.route('/start_run', methods=['POST'])
def _start_run():
config = load_json(request.json)
if not config:
config = {}
if Ctx.is_busy():
return jsonify(busy_json)
request_id = get_uuid()
Ctx.enqueue(config, request_id)
return jsonify(result_json(STATUS_PENDING, pending_msg, request_id))
@app.route('/status', defaults={'request_id': None}, methods=['GET'])
@app.route('/status/<request_id>', methods=['GET'])
def _get_status(request_id):
if request_id:
if Ctx.is_busy() and request_id == Ctx.get_current_request_id():
# task with request_id still pending
return jsonify(result_json(STATUS_PENDING, pending_msg, request_id))
res = Ctx.get_result(request_id)
if res:
# found result for given request_id
return jsonify(res)
# result for given request_id not found
return jsonify(result_json(STATUS_NOT_FOUND, not_found_msg, request_id))
else:
if Ctx.is_busy():
# task still pending, return with request_id
return jsonify(result_json(STATUS_PENDING,
pending_msg,
Ctx.get_current_request_id()))
res = Ctx.get_result()
if res:
return jsonify(res)
return jsonify(not_busy_json)
return app
class WebServer(object):
"""This class takes care of the web server. Caller should simply create an instance
of this class and pass a runner object then invoke the run method
"""
def __init__(self, runner, fluent_logger):
self.nfvbench_runner = runner
self.app = setup_flask()
self.fluent_logger = fluent_logger
def run(self, host, port):
# app.run will not return so we need to run it in a background thread so that
# the calling thread (main thread) can keep doing work
Thread(target=self.app.run, args=(host, port)).start()
# wait for run requests
# the runner must be executed from the main thread (Trex client library requirement)
while True:
# print 'main thread waiting for requests...'
config = Ctx.dequeue()
# print 'main thread processing request...'
# print config
try:
# remove unfilled values as we do not want them to override default values with None
config = {k: v for k, v in config.items() if v is not None}
with RunLock():
if self.fluent_logger:
self.fluent_logger.start_new_run()
results = self.nfvbench_runner.run(config, config)
except Exception as exc:
results = result_json(STATUS_ERROR, str(exc))
LOG.exception('NFVbench runner exception:')
# this might overwrite a previously unfetched result
Ctx.set_result(results)
try:
summary = NFVBenchSummarizer(results['result'], self.fluent_logger)
LOG.info(str(summary))
except KeyError:
# in case of error, 'result' might be missing
if 'error_message' in results:
LOG.error(results['error_message'])
else:
LOG.error('REST request completed without results or error message')
Ctx.release()
if self.fluent_logger:
self.fluent_logger.send_run_summary(True)
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