graph.py 8.36 KB
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# Copyright 2014 Budapest University of Technology and Economics (BME IK)
#
# This file is part of CIRCLE Cloud.
#
# CIRCLE 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 3 of the License, or (at your option)
# any later version.
#
# CIRCLE 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.
#
# You should have received a copy of the GNU General Public License along
# with CIRCLE.  If not, see <http://www.gnu.org/licenses/>.

from __future__ import absolute_import, unicode_literals

import logging
import requests

from django.conf import settings
from django.core.exceptions import PermissionDenied, SuspiciousOperation
from django.http import HttpResponse, Http404
from django.views.generic import View

from braces.views import LoginRequiredMixin, SuperuserRequiredMixin

from vm.models import Instance, Node


logger = logging.getLogger(__name__)


def register_graph(metric_cls, graph_name, graphview_cls):
    if not hasattr(graphview_cls, 'metrics'):
        graphview_cls.metrics = {}
    graphview_cls.metrics[graph_name] = metric_cls


class GraphViewBase(LoginRequiredMixin, View):
    def create_class(self, cls):
        return type(str(cls.__name__ + 'Metric'), (cls, self.base), {})

    def get(self, request, pk, metric, time, *args, **kwargs):
        graphite_url = settings.GRAPHITE_URL
        if graphite_url is None:
            raise Http404()

        try:
            metric = self.metrics[metric]
        except KeyError:
            raise SuspiciousOperation()

        try:
            instance = self.get_object(request, pk)
        except self.model.DoesNotExist:
            raise Http404()

        metric = self.create_class(metric)(instance)

        return HttpResponse(metric.get_graph(graphite_url, time),
                            mimetype="image/png")

    def get_object(self, request, pk):
        instance = self.model.objects.get(id=pk)
        if not instance.has_level(request.user, 'user'):
            raise PermissionDenied()
        return instance


class Metric(object):
    cacti_style = True
    derivative = False
    scale_to_seconds = None
    metric_name = None
    title = None
    label = None

    def __init__(self, obj, metric_name=None):
        self.obj = obj
        self.metric_name = (
            metric_name or self.metric_name or self.__class__.__name__.lower())

    def get_metric_name(self):
        return self.metric_name

    def get_label(self):
        return self.label or self.get_metric_name()

    def get_title(self):
        return self.title or self.get_metric_name()

    def get_minmax(self):
        return (None, None)

    def get_target(self):
        target = '%s.%s' % (self.obj.metric_prefix, self.get_metric_name())
        if self.derivative:
            target = 'nonNegativeDerivative(%s)' % target
        if self.scale_to_seconds:
            target = 'scaleToSeconds(%s, %d)' % (target, self.scale_to_seconds)
        target = 'alias(%s, "%s")' % (target, self.get_label())
        if self.cacti_style:
            target = 'cactiStyle(%s)' % target
        return target

    def get_graph(self, graphite_url, time, width=500, height=200):
        params = {'target': self.get_target(),
                  'from': '-%s' % time,
                  'title': self.get_title().encode('UTF-8'),
                  'width': width,
                  'height': height}

        ymin, ymax = self.get_minmax()
        if ymin is not None:
            params['yMin'] = ymin
        if ymax is not None:
            params['yMax'] = ymax

        logger.debug('%s %s', graphite_url, params)
        response = requests.get('%s/render/' % graphite_url, params=params)
        return response.content


class VmMetric(Metric):
    def get_title(self):
        title = super(VmMetric, self).get_title()
        return '%s (%s) - %s' % (self.obj.name, self.obj.vm_name, title)


class NodeMetric(Metric):
    def get_title(self):
        title = super(NodeMetric, self).get_title()
        return '%s (%s) - %s' % (self.obj.name, self.obj.host.hostname, title)


class VmGraphView(GraphViewBase):
    model = Instance
    base = VmMetric


class NodeGraphView(SuperuserRequiredMixin, GraphViewBase):
    model = Node
    base = NodeMetric

    def get_object(self, request, pk):
        return self.model.objects.get(id=pk)


class NodeListGraphView(SuperuserRequiredMixin, GraphViewBase):
    model = Node
    base = Metric

    def get_object(self, request, pk):
        return Node.objects.filter(enabled=True)

    def get(self, request, metric, time, *args, **kwargs):
        return super(NodeListGraphView, self).get(request, None, metric, time)


class Ram(object):
    metric_name = "memory.usage"
    title = "RAM usage (%)"
    label = "RAM usage (%)"

    def get_minmax(self):
        return (0, 105)

register_graph(Ram, 'memory', VmGraphView)
register_graph(Ram, 'memory', NodeGraphView)


class Cpu(object):
    metric_name = "cpu.percent"
    title = "CPU usage (%)"
    label = "CPU usage (%)"

    def get_minmax(self):
        if isinstance(self.obj, Node):
            return (0, 105)
        else:
            return (0, self.obj.num_cores * 100 + 5)

register_graph(Cpu, 'cpu', VmGraphView)
register_graph(Cpu, 'cpu', NodeGraphView)


class VmNetwork(object):
    title = "Network"

    def get_minmax(self):
        return (0, None)

    def get_target(self):
        metrics = []
        for n in self.obj.interface_set.all():
            params = (self.obj.metric_prefix, n.vlan.vid, n.vlan.name)
            metrics.append(
                'alias(scaleToSeconds(nonNegativeDerivative('
                '%s.network.bytes_recv-%s), 10), "out - %s (bits/s)")' % (
                    params))
            metrics.append(
                'alias(scaleToSeconds(nonNegativeDerivative('
                '%s.network.bytes_sent-%s), 10), "in - %s (bits/s)")' % (
                    params))
        return 'group(%s)' % ','.join(metrics)

register_graph(VmNetwork, 'network', VmGraphView)


class NodeNetwork(object):
    title = "Network"

    def get_minmax(self):
        return (0, None)

    def get_target(self):
        return (
            'aliasSub(scaleToSeconds(nonNegativeDerivative(%s.network.b*),'
            '10), ".*\.bytes_(sent|recv)-([a-zA-Z0-9]+).*", "\\2 \\1")' % (
                self.obj.metric_prefix))

register_graph(NodeNetwork, 'network', NodeGraphView)


class NodeVms(object):
    metric_name = "vmcount"
    title = "Instance count"
    label = "instance count"

    def get_minmax(self):
        return (0, None)

register_graph(NodeVms, 'vm', NodeGraphView)


class NodeAllocated(object):
    title = "Allocated memory (bytes)"

    def get_target(self):
        prefix = self.obj.metric_prefix
        if self.obj.online:
            ram_size = self.obj.ram_size
        else:
            ram_size = 0
        used = 'alias(%s.memory.used_bytes, "used")' % prefix
        allocated = 'alias(%s.memory.allocated, "allocated")' % prefix
        max = 'threshold(%d, "max")' % ram_size
        return 'cactiStyle(group(%s, %s, %s))' % (used, allocated, max)

    def get_minmax(self):
        return (0, None)

register_graph(NodeAllocated, 'alloc', NodeGraphView)


class NodeListAllocated(object):
    title = "Allocated memory (bytes)"

    def get_target(self):
        nodes = self.obj
        used = ','.join('%s.memory.used_bytes' % n.metric_prefix
                        for n in nodes)
        allocated = 'alias(sumSeries(%s), "allocated")' % ','.join(
            '%s.memory.allocated' % n.metric_prefix for n in nodes)
        max = 'threshold(%d, "max")' % sum(
            n.ram_size for n in nodes if n.online)
        return ('group(aliasSub(aliasByNode(stacked(group(%s)), 1), "$",'
                '"  (used)"), %s, %s)' % (used, allocated, max))

    def get_minmax(self):
        return (0, None)

register_graph(NodeListAllocated, 'alloc', NodeListGraphView)


class NodeListVms(object):
    title = "Instance count"

    def get_target(self):
        vmcount = ','.join('%s.vmcount' % n.metric_prefix for n in self.obj)
        return 'group(aliasByNode(stacked(group(%s)), 1))' % vmcount

    def get_minmax(self):
        return (0, None)

register_graph(NodeListVms, 'vm', NodeListGraphView)