root / snf-stats-app / synnefo_stats / grapher.py @ ff5edb80
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# Copyright 2011-2013 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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# 1. Redistributions of source code must retain the above
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# copyright notice, this list of conditions and the following
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# disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials
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# provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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from django.http import HttpResponse |
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import gd |
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import os |
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from cStringIO import StringIO |
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import rrdtool |
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from Crypto.Cipher import AES |
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from base64 import urlsafe_b64decode |
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from hashlib import sha256 |
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from synnefo_stats import settings |
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from synnefo.util.text import uenc |
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from snf_django.lib.api import faults, api_method |
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from logging import getLogger |
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log = getLogger(__name__) |
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def read_file(filepath): |
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f = open(filepath, "r") |
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try:
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data = f.read() |
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finally:
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f.close() |
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return data
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def draw_cpu_bar(fname, outfname=None): |
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fname = os.path.join(fname, "cpu", "virt_cpu_total.rrd") |
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try:
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values = rrdtool.fetch(fname, "AVERAGE")[2][-20:] |
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except rrdtool.error:
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values = [(0.0, )]
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v = [x[0] for x in values if x[0] is not None] |
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if not v: |
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# Fallback in case we only get NaNs
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v = [0.0]
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# Pick the last value
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value = v[-1]
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image = gd.image((settings.IMAGE_WIDTH, settings.HEIGHT)) |
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border_color = image.colorAllocate(settings.BAR_BORDER_COLOR) |
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white = image.colorAllocate((0xff, 0xff, 0xff)) |
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background_color = image.colorAllocate(settings.BAR_BG_COLOR) |
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if value >= 90.0: |
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line_color = image.colorAllocate((0xff, 0x00, 0x00)) |
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elif value >= 75.0: |
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line_color = image.colorAllocate((0xda, 0xaa, 0x00)) |
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else:
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line_color = image.colorAllocate((0x00, 0xa1, 0x00)) |
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image.rectangle((0, 0), |
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(settings.WIDTH - 1, settings.HEIGHT - 1), |
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border_color, background_color) |
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image.rectangle((1, 1), |
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(int(value / 100.0 * (settings.WIDTH - 2)), |
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settings.HEIGHT - 2),
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line_color, line_color) |
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image.string_ttf(settings.FONT, 8.0, 0.0, |
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(settings.WIDTH + 1, settings.HEIGHT - 1), |
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"CPU: %.1f%%" % value, white)
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io = StringIO() |
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image.writePng(io) |
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io.seek(0)
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data = io.getvalue() |
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io.close() |
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return data
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def draw_net_bar(fname, outfname=None): |
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fname = os.path.join(fname, "interface", "if_octets-eth0.rrd") |
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try:
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values = rrdtool.fetch(fname, "AVERAGE")[2][-20:] |
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except rrdtool.error:
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values = [(0.0, 0.0)] |
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v = [x for x in values if x[0] is not None and x[1] is not None] |
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if not v: |
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# Fallback in case we only get NaNs
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v = [(0.0, 0.0)] |
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rx_value, tx_value = v[-1]
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# Convert to bits
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rx_value = rx_value * 8 / 10 ** 6 |
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tx_value = tx_value * 8 / 10 ** 6 |
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max_value = (int(max(rx_value, tx_value) / 50) + 1) * 50.0 |
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image = gd.image((settings.IMAGE_WIDTH, settings.HEIGHT)) |
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border_color = image.colorAllocate(settings.BAR_BORDER_COLOR) |
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white = image.colorAllocate((0xff, 0xff, 0xff)) |
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background_color = image.colorAllocate(settings.BAR_BG_COLOR) |
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tx_line_color = image.colorAllocate((0x00, 0xa1, 0x00)) |
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rx_line_color = image.colorAllocate((0x00, 0x00, 0xa1)) |
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image.rectangle((0, 0), |
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(settings.WIDTH - 1, settings.HEIGHT - 1), |
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border_color, background_color) |
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image.rectangle((1, 1), |
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(int(tx_value / max_value * (settings.WIDTH - 2)), |
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settings.HEIGHT / 2 - 1), |
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tx_line_color, tx_line_color) |
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image.rectangle((1, settings.HEIGHT / 2), |
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(int(rx_value / max_value * (settings.WIDTH - 2)), |
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settings.HEIGHT - 2),
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rx_line_color, rx_line_color) |
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image.string_ttf(settings.FONT, 8.0, 0.0, |
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(settings.WIDTH + 1, settings.HEIGHT - 1), |
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"TX/RX: %.2f/%.2f Mbps" % (tx_value, rx_value), white)
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io = StringIO() |
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image.writePng(io) |
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io.seek(0)
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data = io.getvalue() |
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io.close() |
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return data
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def draw_cpu_ts(fname, outfname): |
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fname = os.path.join(fname, "cpu", "virt_cpu_total.rrd") |
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outfname += "-cpu.png"
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rrdtool.graph(outfname, "-s", "-1d", "-e", "-20s", |
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#"-t", "CPU usage",
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"-v", "%", |
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#"--lazy",
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"DEF:cpu=%s:value:AVERAGE" % fname,
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"LINE1:cpu#00ff00:")
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return read_file(outfname)
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def draw_cpu_ts_w(fname, outfname): |
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fname = os.path.join(fname, "cpu", "virt_cpu_total.rrd") |
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outfname += "-cpu-weekly.png"
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rrdtool.graph(outfname, "-s", "-1w", "-e", "-20s", |
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#"-t", "CPU usage",
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"-v", "%", |
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#"--lazy",
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"DEF:cpu=%s:value:AVERAGE" % fname,
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"LINE1:cpu#00ff00:")
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return read_file(outfname)
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def draw_net_ts(fname, outfname): |
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fname = os.path.join(fname, "interface", "if_octets-eth0.rrd") |
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outfname += "-net.png"
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rrdtool.graph(outfname, "-s", "-1d", "-e", "-20s", |
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"--units", "si", |
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"-v", "Bits/s", |
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"COMMENT:\t\t\tAverage network traffic\\n",
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"DEF:rx=%s:rx:AVERAGE" % fname,
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"DEF:tx=%s:tx:AVERAGE" % fname,
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"CDEF:rxbits=rx,8,*",
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"CDEF:txbits=tx,8,*",
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"LINE1:rxbits#00ff00:Incoming",
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"GPRINT:rxbits:AVERAGE:\t%4.0lf%sbps\t\g",
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"LINE1:txbits#0000ff:Outgoing",
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"GPRINT:txbits:AVERAGE:\t%4.0lf%sbps\\n")
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return read_file(outfname)
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def draw_net_ts_w(fname, outfname): |
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fname = os.path.join(fname, "interface", "if_octets-eth0.rrd") |
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outfname += "-net-weekly.png"
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rrdtool.graph(outfname, "-s", "-1w", "-e", "-20s", |
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"--units", "si", |
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"-v", "Bits/s", |
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"COMMENT:\t\t\tAverage network traffic\\n",
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"DEF:rx=%s:rx:AVERAGE" % fname,
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"DEF:tx=%s:tx:AVERAGE" % fname,
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"CDEF:rxbits=rx,8,*",
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"CDEF:txbits=tx,8,*",
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"LINE1:rxbits#00ff00:Incoming",
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"GPRINT:rxbits:AVERAGE:\t%4.0lf%sbps\t\g",
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"LINE1:txbits#0000ff:Outgoing",
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"GPRINT:txbits:AVERAGE:\t%4.0lf%sbps\\n")
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return read_file(outfname)
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def decrypt(secret): |
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# Make sure key is 32 bytes long
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key = sha256(settings.STATS_SECRET_KEY).digest() |
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aes = AES.new(key) |
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return aes.decrypt(urlsafe_b64decode(secret)).rstrip('\x00') |
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available_graph_types = {'cpu-bar': draw_cpu_bar,
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'net-bar': draw_net_bar,
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'cpu-ts': draw_cpu_ts,
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'net-ts': draw_net_ts,
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'cpu-ts-w': draw_cpu_ts_w,
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'net-ts-w': draw_net_ts_w
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} |
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@api_method(http_method='GET', token_required=False, user_required=False, |
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format_allowed=False, logger=log)
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def grapher(request, graph_type, hostname): |
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hostname = decrypt(uenc(hostname)) |
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fname = uenc(os.path.join(settings.RRD_PREFIX, hostname)) |
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if not os.path.isdir(fname): |
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raise faults.ItemNotFound('No such instance') |
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outfname = uenc(os.path.join(settings.GRAPH_PREFIX, hostname)) |
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draw_func = available_graph_types[graph_type] |
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response = HttpResponse(draw_func(fname, outfname), |
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status=200, content_type="image/png") |
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response.override_serialization = True
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return response
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