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# -*- coding: utf-8 -*- |
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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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import re |
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import time |
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from collections import deque |
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import plumd |
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import plumd.plugins |
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from plumd.calc import Differential |
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from plumd.util import get_file, get_file_map |
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class NetDev(plumd.plugins.Reader): |
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"""Plugin to measure various kernel metrics from /proc.""" |
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rename = { |
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'packets': 'pkt', |
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'compressed': 'compr', |
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'multicast': 'mcast', |
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} |
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defaults = { |
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'poll.interval': 10, |
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'proc_path': '/proc', |
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'proc_netdev_re': "(virbr\d+)|(vnet\d+)" |
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} |
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def __init__(self, log, config): |
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"""Plugin to measure network interface metrics from proc file net/dev. |
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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(NetDev, self).__init__(log, config) |
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config.defaults(NetDev.defaults) |
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self.proc_file = "{0}/net/dev".format(config.get('proc_path')) |
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self.dev_re = re.compile(config.get('proc_netdev_re')) |
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self.calc = Differential() |
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self.enabled = True |
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self.dev_cols = self.get_columns() |
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def get_columns(self): |
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cols = [] |
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dat = get_file(self.proc_file) |
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lines = deque(dat.split("\n")) |
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nlines = len(lines) |
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# expect at least one network interface + 2 header lines |
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if nlines < 2: |
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msg = "NetDev: cannot parse {0}" |
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self.log.error(msg.format(self.proc_file)) |
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self.enabled = False |
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return cols |
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# skip first line eg. Inter-| Receive |
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lines.popleft() |
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# next line has the header values |
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hdr_vals = deque(lines.popleft().split("|")) |
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# remove eg. face |
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hdr_vals.popleft() |
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if len(hdr_vals) != 2: |
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msg = "NetDev: cannot parse {0}" |
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self.log.error(msg.format(self.proc_files)) |
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self.enabled = False |
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return cols |
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# values are receive then transmit |
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hdrs = dict(zip(["rx", "tx"], hdr_vals)) |
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for pfx, metrics in hdrs.items(): |
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for metric in metrics.split(): |
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if metric in NetDev.rename: |
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metric = NetDev.rename[metric] |
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cols.append("{0}_{1}".format(pfx, metric)) |
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return cols |
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def poll(self): |
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"""Return network interface metrics from proc file net/dev. |
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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 interface metrics from proc file net/dev. |
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:rtype: list |
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""" |
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result = plumd.Result("netdev") |
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if not self.enabled: |
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return [result] |
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dat = {} |
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cols = self.dev_cols |
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regexp = self.dev_re |
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# read and process /proc/net/dev |
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with open(self.proc_file, 'r') as f: |
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lines = deque(f.read().strip().split("\n")) |
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# remove the two header lines - format fail :| |
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lines.popleft() |
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lines.popleft() |
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# for Differential |
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ts = time.time() |
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# now it's dev, metrics |
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for line in lines: |
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dat = line.split() |
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dev = dat[0][:-1] |
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vals = dat[1:] |
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if regexp.match(dev): |
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continue |
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for key, val in dict(zip(cols, vals)).items(): |
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mstr = "{0}.{1}".format(dev, key) |
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dval = self.calc.per_second(mstr, int(val), ts) |
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result.add(plumd.Float(mstr, dval)) |
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return [result] |
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s4z /
plumd
