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'''
Python implementation of the "simple" Performance Metrics Domain Agent.
'''
#
# Copyright (c) 2013 Red Hat.
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
import os
import time
import ctypes
from ctypes import c_int, POINTER, cast
import cpmapi as c_api
from pcp.pmda import PMDA, pmdaMetric, pmdaIndom, pmdaInstid
from pcp.pmapi import pmUnits, pmContext as PCP
class SimplePMDA(PMDA):
'''
A simple Performance Metrics Domain Agent with very simple metrics.
Install it and make basic use of it, as follows:
# $PCP_PMDAS_DIR/simple/Install
[select python option]
$ pminfo -fmdtT simple
Then experiment with the simple.conf file (see simple.now metrics).
'''
# simple.color instance domain
red = 0
green = 100
blue = 200
colors = [pmdaInstid(0, 'red'),
pmdaInstid(1, 'green'),
pmdaInstid(2, 'blue')]
# simple.now instance domain
configfile = ''
timeslices = {}
times = ()
# simple.numfetch properties
numfetch = 0
oldfetch = -1
def simple_instance(self, serial):
''' Called once per "instance request" PDU '''
# self.log("instance update for %d" % serial)
if (serial == 1):
self.simple_timenow_check()
def simple_fetch(self):
''' Called once per "fetch" PDU, before callbacks '''
self.numfetch += 1
self.simple_timenow_check()
def simple_fetch_color_callback(self, item, inst):
'''
Returns a list of value,status (single pair) for color cluster
Helper for the fetch callback
'''
if (item == 0):
if (inst != c_api.PM_IN_NULL):
return [c_api.PM_ERR_INST, 0]
return [self.numfetch, 1]
elif (item == 1):
if (inst == 0):
self.red = (self.red + 1) % 255
return [self.red, 1]
elif (inst == 1):
self.green = (self.green + 1) % 255
return [self.green, 1]
elif (inst == 2):
self.blue = (self.blue + 1) % 255
return [self.blue, 1]
else:
return [c_api.PM_ERR_INST, 0]
else:
return [c_api.PM_ERR_PMID, 0]
def simple_fetch_times_callback(self, item, inst):
'''
Returns a list of value,status (single pair) for times cluster
Helper for the fetch callback
'''
if (inst != c_api.PM_IN_NULL):
return [c_api.PM_ERR_INST, 0]
if (self.oldfetch < self.numfetch): # get current values, if needed
self.times = os.times()
self.oldfetch = self.numfetch
if (item == 2):
return [self.times[0], 1]
elif (item == 3):
return [self.times[1], 1]
return [c_api.PM_ERR_PMID, 0]
def simple_fetch_now_callback(self, item, inst):
'''
Returns a list of value,status (single pair) for "now" cluster
Helper for the fetch callback
'''
if (item == 4):
voidp = self.inst_lookup(self.now_indom, inst)
if (voidp == None):
return [c_api.PM_ERR_INST, 0]
valuep = cast(voidp, POINTER(c_int))
return [valuep.contents.value, 1]
return [c_api.PM_ERR_PMID, 0]
def simple_fetch_callback(self, cluster, item, inst):
'''
Main fetch callback, defers to helpers for each cluster.
Returns a list of value,status (single pair) for requested pmid/inst
'''
# self.log("fetch callback for %d.%d[%d]" % (cluster, item, inst))
if (cluster == 0):
return self.simple_fetch_color_callback(item, inst)
elif (cluster == 1):
return self.simple_fetch_times_callback(item, inst)
elif (cluster == 2):
return self.simple_fetch_now_callback(item, inst)
return [c_api.PM_ERR_PMID, 0]
def simple_store_count_callback(self, val):
''' Helper for the store callback, handles simple.numfetch '''
sts = 0
if (val < 0):
sts = c_api.PM_ERR_SIGN
val = 0
self.numfetch = val
return sts
def simple_store_color_callback(self, val, inst):
''' Helper for the store callback, handles simple.color '''
sts = 0
if (val < 0):
sts = c_api.PM_ERR_SIGN
val = 0
elif (val > 255):
sts = c_api.PM_ERR_CONV
val = 255
if (inst == 0):
self.red = val
elif (inst == 1):
self.green = val
elif (inst == 2):
self.blue = val
else:
sts = c_api.PM_ERR_INST
return sts
def simple_store_callback(self, cluster, item, inst, val):
'''
Store callback, executed when a request to write to a metric happens
Defers to helpers for each storable metric. Returns a single value.
'''
if (cluster == 0):
if (item == 0):
return self.simple_store_count_callback(val)
elif (item == 1):
return self.simple_store_color_callback(val, inst)
else:
return c_api.PM_ERR_PMID
elif ((cluster == 1 and (item == 2 or item == 3))
or (cluster == 2 and item == 4)):
return c_api.PM_ERR_PERMISSION
return c_api.PM_ERR_PMID
def simple_timenow_check(self):
'''
Read our configuration file and update instance domain
'''
self.timeslices.clear()
try:
cfg = open(self.configfile)
fields = time.localtime()
values = {'sec': c_int(fields[5]),
'min': c_int(fields[4]),
'hour': c_int(fields[3])}
config = cfg.readline().strip()
for key in config.split(','):
if (key != '' and values[key] != None):
self.timeslices[key] = values[key]
finally:
cfg.close()
self.replace_indom(self.now_indom, self.timeslices)
def __init__(self, name, domain):
PMDA.__init__(self, name, domain)
self.configfile = PCP.pmGetConfig('PCP_PMDAS_DIR')
self.configfile += '/' + name + '/' + name + '.conf'
self.connect_pmcd();
self.color_indom = self.indom(0)
self.add_indom(pmdaIndom(self.color_indom, self.colors))
self.now_indom = self.indom(1)
self.add_indom(pmdaIndom(self.now_indom, self.timeslices))
self.add_metric(name + '.numfetch', pmdaMetric(self.pmid(0, 0),
c_api.PM_TYPE_U32, c_api.PM_INDOM_NULL, c_api.PM_SEM_INSTANT,
pmUnits(0, 0, 0, 0, 0, 0)))
self.add_metric(name + '.color', pmdaMetric(self.pmid(0, 1),
c_api.PM_TYPE_32, self.color_indom, c_api.PM_SEM_INSTANT,
pmUnits(0, 0, 0, 0, 0, 0)))
self.add_metric(name + '.time.user', pmdaMetric(self.pmid(1, 2),
c_api.PM_TYPE_DOUBLE, c_api.PM_INDOM_NULL, c_api.PM_SEM_COUNTER,
pmUnits(0, 1, 0, 0, c_api.PM_TIME_SEC, 0)))
self.add_metric(name + '.time.sys', pmdaMetric(self.pmid(1, 3),
c_api.PM_TYPE_DOUBLE, c_api.PM_INDOM_NULL, c_api.PM_SEM_COUNTER,
pmUnits(0, 1, 0, 0, c_api.PM_TIME_SEC, 0)))
self.add_metric(name + '.now', pmdaMetric(self.pmid(2, 4),
c_api.PM_TYPE_U32, self.now_indom, c_api.PM_SEM_INSTANT,
pmUnits(0, 0, 0, 0, 0, 0)))
self.set_fetch(self.simple_fetch)
self.set_instance(self.simple_instance)
self.set_fetch_callback(self.simple_fetch_callback)
self.set_store_callback(self.simple_store_callback)
self.set_user(PCP.pmGetConfig('PCP_USER'))
self.simple_timenow_check()
if __name__ == '__main__':
SimplePMDA('simple', 253).run()
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