#!/usr/bin/env python

# This is a munin plugin which pulls data from the server in
# misc/operations_helpers/spacetime/diskwatcher.tac . It produces a graph of how much disk space
# is being used per unit time. The plugin should be configured with env_url=
# pointing at the diskwatcher.tac webport.

import os, sys, urllib, json

if len(sys.argv) > 1 and sys.argv[1] == "config":
    print """\
graph_title Tahoe Disk Usage Measurement
graph_vlabel bytes per second
graph_category tahoe
graph_info This graph shows the estimated disk usage per unit time, totalled across all storage servers
graph_args --lower-limit 0 --rigid
rate_1hr.label (one hour sample)
rate_1hr.draw LINE1
rate_1day.label (one day sample)
rate_1day.draw LINE1
rate_2wk.label (two week sample)
rate_2wk.draw LINE2
rate_4wk.label (four week sample)
rate_4wk.draw LINE2"""
    sys.exit(0)

url = os.environ["url"]
timespans = json.load(urllib.urlopen(url))["rates"]

data = dict([(name, growth)
             for (name, timespan, growth, timeleft) in timespans])
# growth is in bytes per second
if "1hr" in data:
    print "rate_1hr.value", data["1hr"]
if "1day" in data:
    print "rate_1day.value", data["1day"]
if "2wk" in data:
    print "rate_2wk.value", data["2wk"]
if "4wk" in data:
    print "rate_4wk.value", data["4wk"]
