def _mount_command(self, image, fs, mountpoint):
command = ['imagemount', '-f', image, '-d', self.device, '-m', mountpoint, '-t', fs, '-r', '-D']
self._runner = Execute(command)
self._runner.run()
status = self._runner.poll()
if not self._unmounting and status != 0:
raise MountException("Mounting returned exit code different than 0")
def _mount_command(self, image, fs, mountpoint):
command = ["imagemount", "-f", image, "-d", self.device, "-m", mountpoint, "-t", fs, "-r", "-D"]
self._runner = Execute(command)
self._runner.run()
status = self._runner.poll()
if not self._unmounting and status != 0:
raise MountException("Mounting returned exit code different than 0")
class DiskIOUtilisationPlugin(ThreadedMetricPlugin):
"""
This plugin collects the disk I/O utilisation, it does represent the average I/O
usage of the backup disk over the interval period in percents.
"""
NAME = 'Disk_IO_Utilisation'
COMMAND = [
'iostat', '-x', '-d',
str(ConfigHelper.config['node']['backup_disk'])
]
def _run(self):
self._thread = Thread(target=self._collect_metric, daemon=True)
self._thread.start()
@property
def value(self):
"""
Checks whether a new value is available and returns the up to date value of the metric.
:return: numerical value representing the percentage of the I/O utilisation.
"""
with self._lock:
output = self._runner.output()
if output:
self._value = output
return float(self._value)
def _collect_metric(self):
self.COMMAND.append(str(self.interval))
self._runner = Execute(self.COMMAND,
output_parser=_IOStatParser(),
use_pty=True)
self._runner.run()
def stop(self):
"""
Stops the command that is executed in the background to collect the metric.
:return: None
"""
self._stop = True
self._runner.kill()
self._thread.join()
def unmount(self):
"""
Unmounts the previously mounted image file.
:return: None
"""
if self._thread.isAlive():
self._unmounting = True
self._runner.kill()
self._thread.join()
self._unmounting = False
command = ['umount', self.mountpoint]
Execute(command).run()
class DiskIOUtilisationPlugin(ThreadedMetricPlugin):
"""
This plugin collects the disk I/O utilisation, it does represent the average I/O
usage of the backup disk over the interval period in percents.
"""
NAME = 'Disk_IO_Utilisation'
COMMAND = ['iostat', '-x', '-d', str(ConfigHelper.config['node']['backup_disk'])]
def _run(self):
self._thread = Thread(target=self._collect_metric, daemon=True)
self._thread.start()
@property
def value(self):
"""
Checks whether a new value is available and returns the up to date value of the metric.
:return: numerical value representing the percentage of the I/O utilisation.
"""
with self._lock:
output = self._runner.output()
if output:
self._value = output
return float(self._value)
def _collect_metric(self):
self.COMMAND.append(str(self.interval))
self._runner = Execute(self.COMMAND, output_parser=_IOStatParser(), use_pty=True)
self._runner.run()
def stop(self):
"""
Stops the command that is executed in the background to collect the metric.
:return: None
"""
self._stop = True
self._runner.kill()
self._thread.join()
class NBDNode:
"""
This class wraps NBD devices provided by the Linux kernel and allows mounting of
the partclone images with the use of the ImageMount command.
"""
def __init__(self, device):
self.device = device
self.mountpoint = ""
self.error = False
self._runner = None
self._thread = None
self._unmounting = False
def mount(self, image, fs, mountpoint):
"""
Mounts the specified image file at the given mountpoint.
:param image: path to the image file to be mounted.
:param fs: file system of the imaged partition.
:param mountpoint: directory to be used for mounting.
:return: None
"""
self.mountpoint = mountpoint
self._thread = ExtendedThread(exception_callback=self._exception_callback,
target=self._mount_command, args=(image, fs, mountpoint),
daemon=True)
self._thread.start()
self._wait_and_set_status()
def _wait_and_set_status(self):
"""
Waits until the image is mounted and checks whether the mount procedure
was successful or not.
:return: None
"""
while self._runner.poll() is Execute.PROCESS_NOT_STARTED:
sleep(constants.BUSY_WAIT_INTERVAL)
if self._runner.poll() is not Execute.PROCESS_RUNNING:
self.error = True
def _mount_command(self, image, fs, mountpoint):
command = ['imagemount', '-f', image, '-d', self.device, '-m', mountpoint, '-t', fs, '-r', '-D']
self._runner = Execute(command)
self._runner.run()
status = self._runner.poll()
if not self._unmounting and status != 0:
raise MountException("Mounting returned exit code different than 0")
def _exception_callback(self, source, e):
self.error = True
def unmount(self):
"""
Unmounts the previously mounted image file.
:return: None
"""
if self._thread.isAlive():
self._unmounting = True
self._runner.kill()
self._thread.join()
self._unmounting = False
command = ['umount', self.mountpoint]
Execute(command).run()
def reset(self):
"""
Resets the node so that it can be used again for mounting another image.
:return: None
"""
self.unmount()
self._runner = None
self._thread = None
self.error = False
class NBDNode:
"""
This class wraps NBD devices provided by the Linux kernel and allows mounting of
the partclone images with the use of the ImageMount command.
"""
def __init__(self, device):
self.device = device
self.mountpoint = ""
self.error = False
self._runner = None
self._thread = None
self._unmounting = False
def mount(self, image, fs, mountpoint):
"""
Mounts the specified image file at the given mountpoint.
:param image: path to the image file to be mounted.
:param fs: file system of the imaged partition.
:param mountpoint: directory to be used for mounting.
:return: None
"""
self.mountpoint = mountpoint
self._thread = ExtendedThread(
exception_callback=self._exception_callback,
target=self._mount_command,
args=(image, fs, mountpoint),
daemon=True,
)
self._thread.start()
self._wait_and_set_status()
def _wait_and_set_status(self):
"""
Waits until the image is mounted and checks whether the mount procedure
was successful or not.
:return: None
"""
while self._runner.poll() is Execute.PROCESS_NOT_STARTED:
sleep(constants.BUSY_WAIT_INTERVAL)
if self._runner.poll() is not Execute.PROCESS_RUNNING:
self.error = True
def _mount_command(self, image, fs, mountpoint):
command = ["imagemount", "-f", image, "-d", self.device, "-m", mountpoint, "-t", fs, "-r", "-D"]
self._runner = Execute(command)
self._runner.run()
status = self._runner.poll()
if not self._unmounting and status != 0:
raise MountException("Mounting returned exit code different than 0")
def _exception_callback(self, source, e):
self.error = True
def unmount(self):
"""
Unmounts the previously mounted image file.
:return: None
"""
if self._thread.isAlive():
self._unmounting = True
self._runner.kill()
self._thread.join()
self._unmounting = False
command = ["umount", self.mountpoint]
Execute(command).run()
def reset(self):
"""
Resets the node so that it can be used again for mounting another image.
:return: None
"""
self.unmount()
self._runner = None
self._thread = None
self.error = False
def _collect_metric(self):
self.COMMAND.append(str(self.interval))
self._runner = Execute(self.COMMAND,
output_parser=_IOStatParser(),
use_pty=True)
self._runner.run()
def _collect_metric(self):
self.COMMAND.append(str(self.interval))
self._runner = Execute(self.COMMAND, output_parser=_IOStatParser(), use_pty=True)
self._runner.run()