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# -*- coding: utf-8 -*- |
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"""Socket stat reader for /proc on Linux.""" |
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import time |
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from collections import deque |
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import plumd |
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from plumd.util import Differential |
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from plumd.util import get_file_map_list, get_file, Filter |
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__author__ = 'Kenny Freeman' |
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__email__ = '[email protected]' |
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__license__ = "ISCL" |
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__docformat__ = 'reStructuredText' |
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class SockStat(plumd.Reader): |
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"""Plugin to measure various kernel metrics from /proc.""" |
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defaults = { |
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'poll.interval': 10, |
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'proc_path': '/proc' |
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View Code Duplication |
} |
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def __init__(self, log, config): |
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"""Plugin to measure various kernel metrics from /proc. |
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:param log: A logger |
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:type log: logging.RootLogger |
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:param config: a plumd.config.Conf configuration helper instance. |
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:type config: plumd.config.Conf |
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""" |
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super(SockStat, self).__init__(log, config) |
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self.config.defaults(SockStat.defaults) |
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self.calc = Differential() |
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proc_path = config.get('proc_path') |
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self.proc_file = "{0}/net/sockstat".format(proc_path) |
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# sys/net/ipv4/tcp_mem format: min, pressure, max |
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self.fname_limits = "{0}/sys/net/ipv4/tcp_mem".format(proc_path) |
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# orphan limit: /proc/sys/net/ipv4/tcp_max_orphans |
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self.fname_orph = "{0}/sys/net/ipv4/tcp_max_orphans".format(proc_path) |
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self.filter = Filter() |
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def poll(self): |
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"""Poll for kernel metrics under /proc. |
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:rtype: ResultSet |
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""" |
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return plumd.ResultSet(self.check()) |
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def check(self): |
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"""Return network socket metrics from proc file net/sockstat. |
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Note: sockstat.TCP.mem is measured in pages, you can get the system page |
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size from os.sysconf("SC_PAGESIZE") |
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Note: FRAG: ip fragmentation |
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:rtype: plumd.Result |
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""" |
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result = plumd.Result("sockstat") |
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# read and process - dat is a list of lines from fname |
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dat = get_file_map_list(self.proc_file, 0, 0) |
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# each entry is a key: [metric, val, metric, val] |
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for key, val in dat.items(): |
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mstr = key[:-1] |
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mnames = val[::2] |
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# 1::2 - every second item |
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mvals = deque([int(i) for i in val[1::2]]) |
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for mname in mnames: |
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metric = "{0}.{1}".format(mstr, mname) |
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result.add(plumd.Int(metric, mvals.popleft())) |
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# also record configured tcp mem limits |
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dat = get_file(self.fname_limits).split() |
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if len(dat) == 3: |
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# eg. for alerting/dashboard on pages allocated vs max values |
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result.add(plumd.Int("TCP.mem_min", dat[0])) |
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result.add(plumd.Int("TCP.mem_pressure", dat[1])) |
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result.add(plumd.Int("TCP.mem_max", dat[1])) |
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# and max orphans |
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dat = get_file(self.fname_orph) |
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result.add(plumd.Int("TCP.orphan_max", dat)) |
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return [result] |
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s4z /
plumd
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