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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 json
import logging
from threading import Thread
import paramiko
class FIOInvoker(object):
def __init__(self, var_dict={}):
self.logger = logging.getLogger(__name__)
self.event_listeners = set()
self.event_callback_ids = set()
self._remote_host = None
self.callback_id = None
self.terminated = False
self.metadata = var_dict
self.stderr = []
@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, stdout):
self.logger.debug("Started")
self.json_body = ""
try:
for line in iter(stdout.readline, b''):
if line.startswith("fio"):
line = ""
continue
self.json_body += line
try:
if line == "}\n":
json_metric = json.loads(self.json_body)
self.json_body = ""
if not self.terminated:
for event_listener in self.event_listeners:
try:
self.logger.debug(
"Event listener callback")
event_listener(
self.callback_id, json_metric)
except Exception as e:
self.logger.exception(
"Notifying listener %s: %s",
self.callback_id, e)
self.logger.debug(
"Event listener callback complete")
except Exception as e:
self.logger.error("Error parsing JSON: %s", e)
except IOError:
pass # We might have read from the closed socket, ignore it
stdout.close()
self.logger.debug("Finished")
def stderr_handler(self, stderr):
self.logger.debug("Started")
for line in iter(stderr.readline, b''):
self.logger.error("FIO Error: %s", line.rstrip())
self.stderr.append(line.rstrip())
# Sometime, FIO gets stuck and will give us this message:
# fio: job 'sequential_read' hasn't exited in 60 seconds,
# it appears to be stuck. Doing forceful exit of this job.
# A second killall of fio will release it stuck process.
if 'it appears to be stuck' in line:
self.terminate()
stderr.close()
self.logger.debug("Finished")
def execute(self, args=[]):
ssh = self._ssh_client()
command = "sudo ./fio " + ' '.join(args)
self.logger.debug("Remote command: %s" % command)
chan = ssh.get_transport().open_session(timeout=None)
chan.settimeout(None)
chan.exec_command(command)
stdout = chan.makefile('r', -1)
stderr = chan.makefile_stderr('r', -1)
tout = Thread(target=self.stdout_handler, args=(stdout,),
name="%s stdout" % self._remote_host)
tout.daemon = True
tout.start()
terr = Thread(target=self.stderr_handler, args=(stderr,),
name="%s stderr" % self._remote_host)
terr.daemon = True
terr.start()
self.logger.info("Started fio on " + self.remote_host)
exit_status = chan.recv_exit_status()
self.logger.info("Finished fio on %s with exit code %s" %
(self.remote_host, exit_status))
stdout.close()
stderr.close()
self.logger.debug("Joining stderr handler")
terr.join()
self.logger.debug("Joining stdout handler")
tout.join()
self.logger.debug("Ended")
if exit_status != 0:
return self.stderr
return None
def terminate(self):
self.logger.debug("Terminating fio on " + self.remote_host)
self.terminated = True
ssh = self._ssh_client()
command = "sudo killall fio"
self.logger.debug("Executing on %s: %s" % (self.remote_host, command))
(_, stdout, stderr) = ssh.exec_command(command)
for line in stdout.readlines():
self.logger.debug(line.strip())
for line in stderr.readlines():
self.logger.error(line.strip())
stdout.close()
stderr.close()
def _ssh_client(self):
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
if 'username' in self.metadata and 'password' in self.metadata:
ssh.connect(self.remote_host,
username=self.metadata['username'],
password=self.metadata['password'])
return ssh
else:
ssh.connect(self.remote_host, username='storperf',
key_filename='storperf/resources/ssh/storperf_rsa',
timeout=2)
return ssh
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