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##############################################################################
# Copyright (c) 2015 EMC and others.
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################
import subprocess
import json
from threading import Thread
import logging
class FIOInvoker(object):
def __init__(self):
self.logger = logging.getLogger(__name__)
self.event_listeners = set()
def register(self, event_listener):
self.event_listeners.add(event_listener)
def unregister(self, event_listener):
self.event_listeners.discard(event_listener)
def stdout_handler(self):
self.json_body = ""
for line in iter(self.fio_process.stdout.readline, b''):
if line.startswith("fio"):
line = ""
continue
self.json_body += line
try:
if line == "}\n":
self.logger.debug(
"Have a json snippet: %s", self.json_body)
json_metric = json.loads(self.json_body)
self.json_body = ""
for event_listener in self.event_listeners:
event_listener(json_metric)
except Exception, e:
self.logger.error("Error parsing JSON: %s", e)
pass
self.fio_process.stdout.close()
def stderr_handler(self):
for line in iter(self.fio_process.stderr.readline, b''):
print line
self.fio_process.stderr.close()
def execute(self, args=[]):
for arg in args:
self.logger.debug("FIO arg: " + arg)
self.fio_process = subprocess.Popen(['fio'] + args,
universal_newlines=True,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
t = Thread(target=self.stdout_handler, args=())
t.daemon = False
t.start()
t = Thread(target=self.stderr_handler, args=())
t.daemon = False
t.start()
t.join()
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