Add DHCP graphs to the VLAN and Prefix views in NAV

..a VLAN/Prefix page has DHCP graphs displayed if NAV has collected
some recent enough DHCP stats for IP addresses that intersect that
VLAN/Prefix.

Author: jorund1

python/nav/models/manage.py

@@ -63,6 +63,7 @@
 from nav.models.fields import CIDRField
 import nav.models.event
 from nav.oids import get_enterprise_id
+import nav.dhcpstats.common
 
 
 _logger = logging.getLogger(__name__)
@@ -1475,6 +1476,16 @@ def get_graph_url(self):
     def get_absolute_url(self):
         return reverse('prefix-details', args=[self.pk])
 
+    def get_dhcp_graph_urls(self):
+        """
+        Creates urls to graphs showing range/pool/subnet utilization, with one
+        url (and one graph) per set of ranges/pools/subnets in graphite with the
+        same ip_version, server_name and group where at least one
+        range/pool/subnet intersects this prefix.
+        """
+        prefix = IPy.IP(self.net_address)
+        return nav.dhcpstats.common.fetch_graph_urls_for_prefixes([prefix])
+
 
 class Vlan(models.Model):
     """From NAV Wiki: The vlan table defines the IP broadcast domain / vlan. A
@@ -1572,6 +1583,16 @@ def get_graph_url(self, family=4):
 
         return json_graph_url(*series, title=title)
 
+    def get_dhcp_graph_urls(self):
+        """
+        Creates urls to graphs showing range/pool/subnet utilization, with one
+        url (and one graph) per set of ranges/pools/subnets in graphite with the
+        same ip_version, server_name and group where at least one
+        range/pool/subnet intersects this vlan.
+        """
+        prefixes = [IPy.IP(prefix.net_address) for prefix in self.prefixes.all()]
+        return nav.dhcpstats.common.fetch_graph_urls_for_prefixes(prefixes)
+
 
 class NetType(models.Model):
     """From NAV Wiki: The nettype table defines network type;lan, core, link,

python/nav/web/info/prefix/views.py

@@ -26,6 +26,7 @@
 
 from nav.web import utils
 from nav.web.auth.utils import get_account
+from nav.metrics.errors import GraphiteUnreachableError
 from nav.models.manage import Prefix, Usage, PrefixUsage
 from ..forms import SearchForm
 
@@ -140,6 +141,16 @@ def prefix_details(request, prefix_id):
     context['form'] = PrefixUsageForm(instance=prefix)
     context['can_edit'] = authorize_user(request)
 
+    try:
+        dhcp_graph_urls = prefix.get_dhcp_graph_urls()
+        graphite_error = False
+    except GraphiteUnreachableError:
+        dhcp_graph_urls = []
+        graphite_error = True
+
+    context['dhcp_graph_urls'] = dhcp_graph_urls
+    context['graphite_error'] = graphite_error
+
     return render(request, 'info/prefix/details.html', context)
 
 

python/nav/web/info/vlan/views.py

@@ -28,6 +28,7 @@
 
 from nav.models.manage import Prefix, Vlan
 from nav.web.utils import create_title
+from nav.metrics.errors import GraphiteUnreachableError
 from nav.metrics.graphs import get_simple_graph_url
 from nav.metrics.names import join_series
 from nav.metrics.templates import metric_path_for_prefix
@@ -115,6 +116,13 @@ def vlan_details(request, vlanid):
 
     navpath = get_path([(str(vlan), '')])
 
+    try:
+        dhcp_graph_urls = vlan.get_dhcp_graph_urls()
+        graphite_error = False
+    except GraphiteUnreachableError:
+        dhcp_graph_urls = []
+        graphite_error = True
+
     return render(
         request,
         'info/vlan/vlandetails.html',
@@ -126,6 +134,8 @@ def vlan_details(request, vlanid):
             'has_v4': has_v4,
             'has_v6': has_v6,
             'title': create_title(navpath),
+            'dhcp_graph_urls': dhcp_graph_urls,
+            'graphite_error': graphite_error,
         },
     )
 

python/nav/web/templates/info/prefix/details.html

@@ -16,6 +16,9 @@
        $('.prefixgraph').each(function (index, element) {
            new GraphFetcher($(element), element.dataset.url);
        });
+       $('.dhcpgraph').each(function (index, element) {
+           new GraphFetcher($(element), element.dataset.url);
+       });
    });
   </script>
 
@@ -202,6 +205,21 @@ <h3>Prefix details for {{ prefix.net_address }}</h3>
       </div>
     </div>
 
+    {% if dhcp_graph_urls or graphite_error %}
+      {% if graphite_error %}
+        <span class="label alert">Graphite unreachable</span>
+      {% else %}
+        <div class="large-6 column">
+          {% for graph in dhcp_graph_urls %}
+            <div class="dhcpgraph graphitegraph" data-url="{{ graph }}">
+              <div class="rickshaw-container"></div>
+            </div>
+          {% endfor %}
+        </div>
+      {% endif %}
+    {% endif %}
+
+
   </div>
 
 {% endblock %}

python/nav/web/templates/info/vlan/vlandetails.html

@@ -16,6 +16,9 @@
        $('.prefixgraph').each(function (index, element) {
            new GraphFetcher($(element), element.dataset.url);
        });
+       $('.dhcpgraph').each(function (index, element) {
+           new GraphFetcher($(element), element.dataset.url);
+       });
    });
   </script>
 {% endblock %}
@@ -154,4 +157,20 @@ <h2>Prefix graphs</h2>
     {% endfor %}
   </ul>
 
+  {% comment %} Graph containing DHCP statistics for total, assigned and declined addresses {% endcomment %}
+
+  {% if dhcp_graph_urls or graphite_error %}
+    <h2>DHCP graphs</h2>
+    {% if graphite_error %}
+      <span class="label alert">Graphite unreachable</span>
+    {% else %}
+      <ul class="small-block-grid-1 large-block-grid-2">
+        {% for graph in dhcp_graph_urls %}
+          <li class="dhcpgraph graphitegraph" data-url="{{ graph }}">
+            <div class="rickshaw-container"></div>
+          </li>
+        {% endfor %}
+      </ul>
+    {% endif %}
+  {% endif %}
 {% endblock %}