68 lines
2.2 KiB
Python
68 lines
2.2 KiB
Python
"""
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RRD for nodes
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"""
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import os
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import subprocess
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from lib.RRD import DS, RRA, RRD
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class NodeRRD(RRD):
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ds_list = [
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DS('upstate', 'GAUGE', 120, 0, 1),
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DS('clients', 'GAUGE', 120, 0, float('NaN')),
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DS('loadavg', 'GAUGE', 120, 0, float('NaN')),
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]
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rra_list = [
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RRA('AVERAGE', 0.5, 1, 120), # 2 hours of 1 minute samples
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RRA('AVERAGE', 0.5, 5, 1440), # 5 days of 5 minute samples
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RRA('AVERAGE', 0.5, 60, 720), # 30 days of 1 hour samples
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RRA('AVERAGE', 0.5, 720, 730), # 1 year of 12 hour samples
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]
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def __init__(self, filename, node=None):
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"""
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Create a new RRD for a given node.
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If the RRD isn't supposed to be updated, the node can be omitted.
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"""
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self.node = node
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super().__init__(filename)
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self.ensure_sanity(self.ds_list, self.rra_list, step=60)
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@property
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def imagename(self):
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return "{basename}.png".format(
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basename=os.path.basename(self.filename).rsplit('.', 2)[0])
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# TODO: fix this, python does not support function overloading
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def update(self):
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values = {
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'upstate': int(self.node['flags']['online']),
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'clients': self.node['statistics']['clients']
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}
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if 'loadavg' in self.node['statistics']:
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values['loadavg'] = float(self.node['statistics']['loadavg'])
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super().update(values)
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def graph(self, directory, timeframe):
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"""
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Create a graph in the given directory. The file will be named
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basename.png if the RRD file is named basename.rrd
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"""
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args = ['rrdtool', 'graph', os.path.join(directory, self.imagename),
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'-s', '-' + timeframe,
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'-w', '800',
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'-h', '400',
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'-l', '0',
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'-y', '1:1',
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'DEF:clients=' + self.filename + ':clients:AVERAGE',
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'VDEF:maxc=clients,MAXIMUM',
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'CDEF:c=0,clients,ADDNAN',
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'CDEF:d=clients,UN,maxc,UN,1,maxc,IF,*',
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'AREA:c#0F0:up\\l',
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'AREA:d#F00:down\\l',
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'LINE1:c#00F:clients connected\\l']
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subprocess.check_output(args)
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