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# -*- coding: utf-8 -*- |
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"""Reader plugin to record swap metrics from /proc on Linux.""" |
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import os.path |
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import plumd |
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from plumd.util import get_file_list |
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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 Swap(plumd.Reader): |
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"""Plugin to measure swap metrics from /proc/swap.""" |
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defaults = { |
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'poll.interval': 10, |
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'proc_path': '/proc', |
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} |
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def __init__(self, log, config): |
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"""Plugin to measure swap 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(Swap, self).__init__(log, config) |
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config.defaults(Swap.defaults) |
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self.proc_file = "{0}/swaps".format(config.get('proc_path')) |
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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 swap file usage metrics from proc file swap. |
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:rtype: plumd.Result |
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""" |
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result = plumd.Result("swap") |
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dat = get_file_list(self.proc_file) |
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# header: file, type, size, used, priority |
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if len(dat) >= 1: |
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# remove header line |
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dat.popleft() |
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for entry in dat: |
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try: |
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sfname, stype, ssize, sused, sprio = entry.split() |
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sname = os.path.basename(sfname) |
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mstr = "{0}.used".format(sname) |
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result.add(plumd.Float(mstr, sused)) |
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mstr = "{0}.size".format(sname) |
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result.add(plumd.Float(mstr, ssize)) |
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sfree = float(ssize) - float(sused) |
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mstr = "{0}.free".format(sname) |
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result.add(plumd.Float(mstr, sfree)) |
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except ValueError as exc: |
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self.log.error("invalid swap entry: {0}".format(entry)) |
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return [result] |
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s4z /
plumd
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