feat(interfaces): the interface pages on Bootstrap's cards, tables and dialogs

As the storage and network pages; plan reviewed with Codex.

- The list is grouped by type (bridges, bonds, VLANs, ethernet; a type
  the host has none of is left out), three cards a row, with a search
  of their names, MACs and networks (table_filter.js, which now takes
  any element with data-search as a row); a card per interface: its link
  as the kernel reports it (up green, down grey, another state or
  unknown told as such, no red card for a link that is merely down),
  MAC, MTU, speed when known, the members it reports and the libvirt
  networks that use it, linked.
- An interface's page: an Interface card (type, libvirt's own state
  where it manages interfaces, link, start mode, MAC, MTU, speed, STP,
  networks using it); on a host whose libvirt changes interfaces, a
  card per family with how it is addressed and its addresses; the
  members of a bridge, bond or VLAN with their link and speed, or that
  none is reported; for a bridge, the running VMs' cards on it,
  directly or through a network using it, with their tap and MAC,
  linked (wvmInterface.get_vms: one domain listing). Not the bridge's
  delay: netcf tells it in seconds, the udev backend in hundredths.
  Start or Stop in its heading, Delete in its menu, disabled while it
  runs, on hosts that can change interfaces only.
- A host whose libvirt only reads interfaces says so once, with that
  it does not tell their addresses, instead of "None" on every page.
- The New interface dialog is one form, as the New pool and New
  network ones (choice_dialog.js, radio_card.html): Bridge or
  Ethernet, a bridge's member from the devices it can take, an
  ethernet interface's device from the ones the host does not define
  yet, a static address's fields with its choice; a refused interface,
  or one libvirt refuses, opens it again with what was entered; a made
  one opens its page.
- networks_by_device maps the libvirt networks to their bridges or
  interfaces on the page's own connection.

interfaces/views.py

@@ -5,9 +5,10 @@ from django.urls import reverse
 from django.utils.translation import gettext_lazy as _
 from libvirt import libvirtError
 from computes.models import Compute
+from instances.models import Instance
 from interfaces.forms import AddInterface
 from logs.audit import audit
-from vrtManager.interface import wvmInterface, wvmInterfaces
+from vrtManager.interface import networks_by_device, wvmInterface, wvmInterfaces
 from admin.decorators import superuser_only
 
 
@@ -19,7 +20,18 @@ def interfaces(request, compute_id):
     try:
         conn = wvmInterfaces(compute.hostname, compute.login, compute.password, compute.type)
         ifaces_all = conn.get_ifaces_info()
+        defined_names = [iface["name"] for iface in ifaces_all]
         changeable = conn.can_change_interfaces()
+        used_by = networks_by_device(conn.wvm)
+        for iface in ifaces_all:
+            iface["networks"] = used_by.get(iface["name"], [])
+        # the list by type, in libvirt's four, a type the host has none of left out
+        iface_groups = [(title, [iface for iface in ifaces_all if iface["type"] == kind])
+                        for kind, title in (("bridge", _("Bridges")), ("bond", _("Bonds")),
+                                            ("vlan", _("VLANs")), ("ethernet", _("Ethernet")))]
+        form = AddInterface()
+        # the new interface dialog's type: the one sent back after a refusal
+        if_kind = request.POST.get("itype", "bridge")
 
         # the host's devices are only the create form's choices
         netdevs, members, netdev_error = [], [], None
@@ -27,6 +39,7 @@ def interfaces(request, compute_id):
             try:
                 netdevs = conn.get_net_devices()
                 members = conn.get_member_candidates(netdevs)
+                ethernet_devices = [dev for dev in members if dev not in defined_names]
             except Exception as err:  # a host without the node device driver too
                 netdev_error = err
                 messages.error(request, _("The network devices of this host could not be read: %(error)s") % {"error": err})
@@ -35,19 +48,21 @@ def interfaces(request, compute_id):
         # interfaces; without the host's devices nothing can be checked
         if request.method == "POST" and "create" in request.POST and changeable and netdev_error is None:
             form = AddInterface(request.POST, netdevs=netdevs, members=members,
-                                defined=[iface["name"] for iface in ifaces_all])
+                                defined=defined_names)
             if form.is_valid():
                 data = form.cleaned_data
-                with audit(request, compute, f"Interface {data['name']}", "add"):
-                    conn.create_iface(
-                        data["name"], data["itype"], data["start_mode"], data["netdev"],
-                        data["ipv4_type"], data["ipv4_addr"], data["ipv4_gw"],
-                        data["ipv6_type"], data["ipv6_addr"], data["ipv6_gw"],
-                        data["stp"], data["delay"],
-                    )
-                return HttpResponseRedirect(reverse("interfaces", args=[compute_id]))
-            for msg_err in form.errors.values():
-                messages.error(request, msg_err.as_text())
+                try:
+                    with audit(request, compute, f"Interface {data['name']}", "add"):
+                        conn.create_iface(
+                            data["name"], data["itype"], data["start_mode"], data["netdev"],
+                            data["ipv4_type"], data["ipv4_addr"], data["ipv4_gw"],
+                            data["ipv6_type"], data["ipv6_addr"], data["ipv6_gw"],
+                            data["stp"], data["delay"],
+                        )
+                except libvirtError as err:  # shown in the dialog, which opens again
+                    form.add_error(None, str(err))
+                else:
+                    return HttpResponseRedirect(reverse("interface", args=[compute_id, data["name"]]))
         conn.close()
     except libvirtError as lib_err:
         messages.error(request, lib_err)
@@ -86,7 +101,14 @@ def interface(request, compute_id, iface):
                 return HttpResponseRedirect(here)
 
         info = conn.get_info()
+        info["addressing"] = [("IPv4", info["ipv4"]), ("IPv6", info["ipv6"])]
         state = conn.is_active()
+        networks = networks_by_device(conn.wvm).get(iface, [])
+        if info["type"] == "bridge":
+            vms = conn.get_vms(networks)
+            vm_ids = dict(Instance.objects.filter(compute=compute, name__in=[vm["vm"] for vm in vms]).values_list("name", "id"))
+            for vm in vms:
+                vm["id"] = vm_ids.get(vm["vm"])
         conn.close()
     except libvirtError as lib_err:
         messages.error(request, lib_err)