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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
##############################################################################
from threading import Thread
import cmd
import json
import logging
import subprocess
class FIOInvoker(object):
def __init__(self):
self.logger = logging.getLogger(__name__)
self.event_listeners = set()
self.event_callback_ids = set()
self._remote_host = None
self.callback_id = None
@property
def remote_host(self):
return self._remote_host
@remote_host.setter
def remote_host(self, value):
self._remote_host = value
self.logger = logging.getLogger(__name__ + ":" + value)
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 = ""
try:
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(self.callback_id, json_metric)
except Exception, e:
self.logger.error("Error parsing JSON: %s", e)
pass
except ValueError:
pass # We might have read from the closed socket, ignore it
self.fio_process.stdout.close()
def stderr_handler(self):
for line in iter(self.fio_process.stderr.readline, b''):
self.logger.error("FIO Error: %s", line)
self.fio_process.stderr.close()
def execute(self, args=[]):
self.logger.debug("FIO args " + str(args))
if (self.remote_host is None):
cmd = "fio"
else:
cmd = "ssh"
additional_args = ['-o', 'StrictHostKeyChecking=no',
'-i', 'storperf/resources/ssh/storperf_rsa',
'ubuntu@' + self.remote_host, "./fio"]
args = additional_args + args
self.fio_process = subprocess.Popen([cmd] + 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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