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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
import uuid
from flask import Flask
from flask import jsonify
from flask import render_template
from flask import request
from flask_socketio import emit
from flask_socketio import SocketIO
from summarizer import NFVBenchSummarizer
from log import LOG
from utils import byteify
from utils import RunLock
# this global cannot reside in Ctx because of the @app and @socketio decorators
app = None
socketio = None
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
request_from_socketio = False
results = {}
ids = []
current_id = None
@staticmethod
def enqueue(config, request_id, from_socketio=False):
Ctx.busy = True
Ctx.request_from_socketio = from_socketio
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(root_path):
global socketio
global app
app = Flask(__name__)
app.root_path = root_path
socketio = SocketIO(app, async_mode='threading')
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'
# --------- socketio requests ------------
@socketio.on('start_run')
def _socketio_start_run(config):
if not Ctx.is_busy():
Ctx.enqueue(config, get_uuid(), from_socketio=True)
else:
emit('error', {'reason': 'there is already an NFVbench request running'})
@socketio.on('echo')
def _socketio_echo(config):
emit('echo', config)
# --------- HTTP requests ------------
@app.route('/')
def _index():
return render_template('index.html')
@app.route('/echo', methods=['GET'])
def _echo():
config = request.json
return jsonify(config)
@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)
class WebSocketIoServer(object):
"""This class takes care of the web socketio server, accepts websocket events, and sends back
notifications using websocket events (send_ methods). Caller should simply create an instance
of this class and pass a runner object then invoke the run method
"""
def __init__(self, http_root, runner, fluent_logger):
self.nfvbench_runner = runner
setup_flask(http_root)
self.fluent_logger = fluent_logger
def run(self, host='127.0.0.1', port=7556):
# socketio.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
socketio.start_background_task(target=socketio.run, app=app, host=host, port=port)
# 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:')
if Ctx.request_from_socketio:
socketio.emit('run_end', results)
else:
# 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)
def send_interval_stats(self, time_ms, tx_pps, rx_pps, drop_pct):
stats = {'time_ms': time_ms, 'tx_pps': tx_pps, 'rx_pps': rx_pps, 'drop_pct': drop_pct}
socketio.emit('run_interval_stats', stats)
def send_ndr_found(self, ndr_pps):
socketio.emit('ndr_found', {'rate_pps': ndr_pps})
def send_pdr_found(self, pdr_pps):
socketio.emit('pdr_found', {'rate_pps': pdr_pps})
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