e44eea3318
Use established logging strategy to emit an error log when ZFS version information cannot be obtained.
187 lines
9 KiB
Python
187 lines
9 KiB
Python
"""Displays info about zpools present on the system
|
|
|
|
Parameters:
|
|
* zpool.list: Comma-separated list of zpools to display info for. If empty, info for all zpools
|
|
is displayed. (Default: "")
|
|
* zpool.format: Format string, tags {name}, {used}, {left}, {size}, {percentfree}, {percentuse},
|
|
{status}, {shortstatus}, {fragpercent}, {deduppercent} are supported.
|
|
(Default: "{name} {used}/{size} ({percentfree}%)")
|
|
* zpool.showio: Show also widgets detailing current read and write I/O (Default: true)
|
|
* zpool.ioformat: Format string for I/O widget, tags {ops} (operations per seconds) and {band}
|
|
(bandwidth) are supported. (Default: "{band}")
|
|
* zpool.warnfree: Warn if free space is below this percentage (Default: 10)
|
|
* zpool.sudo: Use sudo when calling the `zpool` binary. (Default: false)
|
|
|
|
Option `zpool.sudo` is intended for Linux users using zfsonlinux older than 0.7.0: In pre-0.7.0
|
|
releases of zfsonlinux regular users couldn't invoke even informative commands such as
|
|
`zpool list`. If this option is true, command `zpool list` is invoked with sudo. If this option
|
|
is used, the following (or ekvivalent) must be added to the `sudoers(5)`:
|
|
|
|
```
|
|
<username/ALL> ALL = (root) NOPASSWD: /usr/bin/zpool list
|
|
```
|
|
|
|
Be aware of security implications of doing this!
|
|
"""
|
|
|
|
import time
|
|
import logging
|
|
from pkg_resources import parse_version
|
|
import bumblebee.engine
|
|
from bumblebee.util import execute, bytefmt, asbool
|
|
|
|
log = logging.getLogger(__name__)
|
|
|
|
class Module(bumblebee.engine.Module):
|
|
def __init__(self, engine, config):
|
|
widgets = []
|
|
super(Module, self).__init__(engine, config, widgets)
|
|
|
|
self._includelist = set(filter(lambda x: len(x) > 0,
|
|
self.parameter("list", default="").split(',')))
|
|
self._format = self.parameter("format", default="{name} {shortstatus} {used}/{size} " +
|
|
"({percentfree}%)")
|
|
self._usesudo = asbool(self.parameter("sudo", default=False))
|
|
self._showio = asbool(self.parameter("showio", default=True))
|
|
self._ioformat = self.parameter("ioformat", default="{band}")
|
|
self._warnfree = int(self.parameter("warnfree", default=10))
|
|
|
|
self._update_widgets(widgets)
|
|
|
|
def update(self, widgets):
|
|
self._update_widgets(widgets)
|
|
|
|
def state(self, widget):
|
|
if widget.name.endswith("__read"):
|
|
return "poolread"
|
|
elif widget.name.endswith("__write"):
|
|
return "poolwrite"
|
|
|
|
state = widget.get("state")
|
|
if state == "FAULTED":
|
|
return [state, "critical"]
|
|
elif state == "DEGRADED" or widget.get("percentfree") < self._warnfree:
|
|
return [state, "warning"]
|
|
|
|
return state
|
|
|
|
def _update_widgets(self, widgets):
|
|
zfs_version_path = "/sys/module/zfs/version"
|
|
# zpool list -H: List all zpools, use script mode (no headers and tabs as separators).
|
|
try:
|
|
with open(zfs_version_path, 'r') as zfs_mod_version:
|
|
zfs_version = zfs_mod_version.readline().rstrip().split('-')[0]
|
|
except FileNotFoundError:
|
|
# ZFS isn't installed or the module isn't loaded, stub the version
|
|
zfs_version = "0.0.0"
|
|
logging.error("ZFS version information not found at {}, check the module is loaded.".format(zfs_version_path))
|
|
|
|
raw_zpools = execute(('sudo ' if self._usesudo else '') + 'zpool list -H').split('\n')
|
|
|
|
for widget in widgets:
|
|
widget.set("visited", False)
|
|
|
|
for raw_zpool in raw_zpools:
|
|
try:
|
|
# Ignored fields (assigned to _) are "expandsz" and "altroot", also "ckpoint" in ZFS 0.8.0+
|
|
if parse_version(zfs_version) < parse_version("0.8.0"):
|
|
name, size, alloc, free, _, frag, cap, dedup, health, _ = raw_zpool.split('\t')
|
|
else:
|
|
name, size, alloc, free, _, _, frag, cap, dedup, health, _ = raw_zpool.split('\t')
|
|
cap = cap.rstrip('%')
|
|
percentuse=int(cap)
|
|
percentfree=100-percentuse
|
|
# There is a command, zpool iostat, which is however blocking and was therefore
|
|
# causing issues.
|
|
# Instead, we read file `/proc/spl/kstat/zfs/<poolname>/io` which contains
|
|
# cumulative I/O statistics since boot (or pool creation). We store these values
|
|
# (and timestamp) during each widget update, and during the next widget update we
|
|
# use them to compute delta of transferred bytes, and using the last and current
|
|
# timestamp the rate at which they have been transferred.
|
|
with open("/proc/spl/kstat/zfs/{}/io".format(name), "r") as f:
|
|
# Third row provides data we need, we are interested in the first 4 values.
|
|
# More info about this file can be found here:
|
|
# https://github.com/zfsonlinux/zfs/blob/master/lib/libspl/include/sys/kstat.h#L580
|
|
# The 4 values are:
|
|
# nread, nwritten, reads, writes
|
|
iostat = list(map(int, f.readlines()[2].split()[:4]))
|
|
except (ValueError, IOError):
|
|
# Unable to parse info about this pool, skip it
|
|
continue
|
|
|
|
if self._includelist and name not in self._includelist:
|
|
continue
|
|
|
|
widget = self.widget(name)
|
|
if not widget:
|
|
widget = bumblebee.output.Widget(name=name)
|
|
widget.set("last_iostat", [0, 0, 0, 0])
|
|
widget.set("last_timestamp", 0)
|
|
widgets.append(widget)
|
|
|
|
delta_iostat = [b - a for a, b in zip(iostat, widget.get("last_iostat"))]
|
|
widget.set("last_iostat", iostat)
|
|
|
|
# From docs:
|
|
# > Note that even though the time is always returned as a floating point number, not
|
|
# > all systems provide time with a better precision than 1 second.
|
|
# Be aware that that may affect the precision of reported I/O
|
|
# Also, during one update cycle the reported I/O may be garbage if the system time
|
|
# was changed.
|
|
timestamp = time.time()
|
|
delta_timestamp = widget.get("last_timestamp") - timestamp
|
|
widget.set("last_timestamp", time.time())
|
|
|
|
# abs is there because sometimes the result is -0
|
|
rate_iostat = [abs(x / delta_timestamp) for x in delta_iostat]
|
|
nread, nwritten, reads, writes = rate_iostat
|
|
|
|
# theme.minwidth is not set since these values are not expected to change
|
|
# rapidly
|
|
widget.full_text(self._format.format(name=name, used=alloc, left=free, size=size,
|
|
percentfree=percentfree, percentuse=percentuse,
|
|
status=health,
|
|
shortstatus=self._shortstatus(health),
|
|
fragpercent=frag, deduppercent=dedup))
|
|
widget.set("state", health)
|
|
widget.set("percentfree", percentfree)
|
|
widget.set("visited", True)
|
|
|
|
if self._showio:
|
|
wname, rname = [name + x for x in ["__write", "__read"]]
|
|
widget_w = self.widget(wname)
|
|
widget_r = self.widget(rname)
|
|
if not widget_w or not widget_r:
|
|
widget_r = bumblebee.output.Widget(name=rname)
|
|
widget_w = bumblebee.output.Widget(name=wname)
|
|
widgets.extend([widget_r, widget_w])
|
|
for w in [widget_r, widget_w]:
|
|
w.set("theme.minwidth", self._ioformat.format(ops=9999,
|
|
band=bytefmt(999.99*(1024**2))))
|
|
w.set("visited", True)
|
|
widget_w.full_text(self._ioformat.format(ops=round(writes),
|
|
band=bytefmt(nwritten)))
|
|
widget_r.full_text(self._ioformat.format(ops=round(reads),
|
|
band=bytefmt(nread)))
|
|
|
|
for widget in widgets:
|
|
if widget.get("visited") is False:
|
|
widgets.remove(widget)
|
|
|
|
@staticmethod
|
|
def _shortstatus(status):
|
|
# From `zpool(8)`, section Device Failure and Recovery:
|
|
# A pool's health status is described by one of three states: online, degraded, or faulted.
|
|
# An online pool has all devices operating normally. A degraded pool is one in which one
|
|
# or more devices have failed, but the data is still available due to a redundant
|
|
# configuration. A faulted pool has corrupted metadata, or one or more faulted devices, and
|
|
# insufficient replicas to continue functioning.
|
|
shortstate = {
|
|
"DEGRADED": "DEG",
|
|
"FAULTED": "FLT",
|
|
"ONLINE": "ONL",
|
|
}
|
|
try:
|
|
return shortstate[status]
|
|
except KeyError:
|
|
return ""
|