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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
import os
import signal
import subprocess
import sys
import psutil
import plugins
import time
def diskstats_parse(dev=None):
file_path = '/proc/diskstats'
result = {}
if not os.path.isfile("/proc/diskstats"):
return False
# ref: http://lxr.osuosl.org/source/Documentation/iostats.txt
columns_disk = ['m', 'mm', 'dev', 'reads', 'rd_mrg', 'rd_sectors',
'ms_reading', 'writes', 'wr_mrg', 'wr_sectors',
'ms_writing', 'cur_ios', 'ms_doing_io', 'ms_weighted']
# For kernel 4.18+
columns_disk_418 = ['m', 'mm', 'dev', 'reads', 'rd_mrg', 'rd_sectors',
'ms_reading', 'writes', 'wr_mrg', 'wr_sectors',
'ms_writing', 'cur_ios', 'ms_doing_io', 'ms_weighted',
'discards', 'discards_merged', 'discarded_sectors',
'discarded_time']
# for kernel 5.5+
columns_disk_55 = ['m', 'mm', 'dev', 'reads', 'rd_mrg', 'rd_sectors',
'ms_reading', 'writes', 'wr_mrg', 'wr_sectors',
'ms_writing', 'cur_ios', 'ms_doing_io', 'ms_weighted',
'discards', 'discards_merged', 'discarded_sectors',
'discarded_time', 'flush', 'flush_time']
columns_partition = ['m', 'mm', 'dev', 'reads', 'rd_sectors', 'writes', 'wr_sectors']
lines = open(file_path, 'r').readlines()
for line in lines:
if line == '':
continue
split = line.split()
if len(split) == len(columns_disk_55):
columns = columns_disk_55
elif len(split) == len(columns_disk_418):
columns = columns_disk_418
elif len(split) == len(columns_disk):
columns = columns_disk
elif len(split) == len(columns_partition):
columns = columns_partition
else:
# No match
continue
data = dict(zip(columns, split))
if data['dev'][:3] == 'nvm' and data['dev'][-2:-1] == 'n':
pass
elif data['dev'][-1:].isdigit() is True:
continue
if "loop" in data['dev'] or "ram" in data['dev']:
continue
if dev is not None and dev != data['dev']:
continue
for key in data:
if key != 'dev':
data[key] = int(data[key])
result[data['dev']] = data
return result
class Plugin(plugins.BasePlugin):
__name__ = 'iostat'
def run(self, *unused):
delta_keys = (
'reads',
'writes',
'wr_sectors',
'rd_sectors',
'ms_reading',
'rd_mrg',
'wr_mrg',
'ms_weighted',
'ms_doing_io',
'ms_writing',
'discarded_sectors',
'discarded_time',
'flush',
'flush_time',
'discards'
)
next_cache = {}
next_cache['ts'] = time.time()
prev_cache = self.get_agent_cache() # Get absolute values from previous check
disks = diskstats_parse()
if not disks or disks is False:
results = {}
try:
diskdata = psutil.disk_io_counters(perdisk=True)
for device, values in diskdata.items():
device_stats = {}
for key_value in values._fields:
device_stats[key_value] = getattr(values, key_value)
results[device] = device_stats
except Exception as e:
results = e.message
else:
results = {}
for device, values in disks.items():
device_stats = {}
next_cache[device] = {}
next_cache[device]['ts'] = time.time()
try:
prev_cache[device]
except:
prev_cache[device] = {}
for key_value, value in values.items():
if key_value in delta_keys:
try:
device_stats[key_value] = self.absolute_to_per_second(key_value, value, prev_cache[device])
except:
pass
next_cache[device][key_value] = value
else:
device_stats[key_value] = value
try:
device_stats['avgrq-sz'] = (device_stats['wr_sectors']+device_stats['rd_sectors']) / (device_stats['reads']+device_stats['writes'])
except:
device_stats['avgrq-sz'] = 0
try:
device_stats['tps'] = device_stats['reads']+device_stats['writes']
except:
device_stats['tps'] = 0
try:
device_stats['usage'] = (100 * device_stats['ms_doing_io']) / (1000 * (next_cache['ts'] - prev_cache['ts']))
except:
device_stats['usage'] = 0
results[device] = device_stats
self.set_agent_cache(next_cache)
return results
if __name__ == '__main__':
Plugin().execute()