Merge branch 'graph_topo' into 'master'

branche de création de graph

See merge request federez/re2o!164

machines/migrations/0081_auto_20180521_1413.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.7 on 2018-05-21 19:13
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('machines', '0080_auto_20180502_2334'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='extension',
+            name='soa',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='machines.SOA'),
+        ),
+    ]

topologie/migrations/0060_server.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.7 on 2018-05-21 19:13
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('machines', '0081_auto_20180521_1413'),
+        ('topologie', '0059_auto_20180415_2249'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Server',
+            fields=[
+            ],
+            options={
+                'proxy': True,
+            },
+            bases=('machines.machine',),
+        ),
+    ]

topologie/models.py

@@ -40,7 +40,8 @@ from __future__ import unicode_literals
 import itertools
 
 from django.db import models
-from django.db.models.signals import post_save, post_delete
+from django.db.models.signals import pre_save, post_save, post_delete
+from django.utils.functional import cached_property
 from django.dispatch import receiver
 from django.core.exceptions import ValidationError
 from django.db import IntegrityError
@@ -50,6 +51,11 @@ from reversion import revisions as reversion
 from machines.models import Machine, regen
 from re2o.mixins import AclMixin, RevMixin
 
+from os.path import isfile 
+from os import remove
+
+
+
 
 class Stack(AclMixin, RevMixin, models.Model):
     """Un objet stack. Regrouppe des switchs en foreign key
@@ -103,6 +109,70 @@ class AccessPoint(AclMixin, Machine):
             ("view_accesspoint", "Peut voir une borne"),
         )
 
+    def port(self):
+        """Return the queryset of ports for this device"""
+        return Port.objects.filter(
+            machine_interface__machine=self
+        )
+
+    def switch(self):
+        """Return the switch where this is plugged"""
+        return Switch.objects.filter(
+            ports__machine_interface__machine=self
+        )
+
+    def building(self):
+        """Return the building of the AP/Server (building of the switchs connected to...)"""
+        return Building.objects.filter(
+            switchbay__switch=self.switch()
+        )
+
+    @cached_property
+    def short_name(self):
+        return str(self.interface_set.first().domain.name)
+
+    @classmethod
+    def all_ap_in(cls, building_instance):
+        """Get a building as argument, returns all ap of a building"""
+        return cls.objects.filter(interface__port__switch__switchbay__building=building_instance)
+
+    def __str__(self):
+        return str(self.interface_set.first())
+
+
+class Server(Machine):
+    """Dummy class, to retrieve servers of a building, or get switch of a server"""
+
+    class Meta:
+        proxy = True
+
+    def port(self):
+        """Return the queryset of ports for this device"""
+        return Port.objects.filter(
+            machine_interface__machine=self
+        )
+
+    def switch(self):
+        """Return the switch where this is plugged"""
+        return Switch.objects.filter(
+            ports__machine_interface__machine=self
+        )
+
+    def building(self):
+        """Return the building of the AP/Server (building of the switchs connected to...)"""
+        return Building.objects.filter(
+            switchbay__switch=self.switch()
+        )
+
+    @cached_property
+    def short_name(self):
+        return str(self.interface_set.first().domain.name)
+
+    @classmethod
+    def all_server_in(cls, building_instance):
+        """Get a building as argument, returns all server of a building"""
+        return cls.objects.filter(interface__port__switch__switchbay__building=building_instance).exclude(accesspoint__isnull=False)
+
     def __str__(self):
         return str(self.interface_set.first())
 
@@ -422,15 +492,47 @@ class Room(AclMixin, RevMixin, models.Model):
 def ap_post_save(**_kwargs):
     """Regeneration des noms des bornes vers le controleur"""
     regen('unifi-ap-names')
-
+    regen("graph_topo")
 
 @receiver(post_delete, sender=AccessPoint)
 def ap_post_delete(**_kwargs):
     """Regeneration des noms des bornes vers le controleur"""
     regen('unifi-ap-names')
-
+    regen("graph_topo")
 
 @receiver(post_delete, sender=Stack)
 def stack_post_delete(**_kwargs):
     """Vide les id des switches membres d'une stack supprimée"""
     Switch.objects.filter(stack=None).update(stack_member_id=None)
+
+@receiver(post_save, sender=Port)
+def port_post_save(**_kwargs):
+    regen("graph_topo")
+
+@receiver(post_delete, sender=Port)
+def port_post_delete(**_kwargs):
+    regen("graph_topo")
+
+@receiver(post_save, sender=ModelSwitch)
+def modelswitch_post_save(**_kwargs):
+    regen("graph_topo")
+
+@receiver(post_delete, sender=ModelSwitch)
+def modelswitch_post_delete(**_kwargs):
+    regen("graph_topo")
+
+@receiver(post_save, sender=Building)
+def building_post_save(**_kwargs):
+    regen("graph_topo")
+
+@receiver(post_delete, sender=Building)
+def building_post_delete(**_kwargs):
+    regen("graph_topo")
+
+@receiver(post_save, sender=Switch)
+def switch_post_save(**_kwargs):
+    regen("graph_topo")
+
+@receiver(post_delete, sender=Switch)
+def switch_post_delete(**_kwargs):
+    regen("graph_topo")

topologie/templates/topologie/graph_switch.dot

@@ -0,0 +1,135 @@
+{% block graph_dot %}
+strict digraph {
+graph [label="TOPOLOGIE DU RÉSEAU", labelloc=t, fontsize=40];
+node [fontname=Helvetica fontsize=8 shape=plaintext];
+edge[arrowhead=none];
+
+
+{% block subgraphs %}
+{% for sub in subs %}
+subgraph cluster_{{ sub.bat_id }} {
+fontsize=15;
+label="Bâtiment {{ sub.bat_name }}";
+
+{% if sub.bornes %}
+{% block bornes %}
+node [label=<
+<TABLE BGCOLOR="{{ colors.back}}" BORDER="0" CELLBORDER="0" CELLSPACING="0">
+<TR>
+	<TD COLSPAN="2" CELLPADDING="4" ALIGN="CENTER" BGCOLOR="{{ colors.head_bornes }}"> 
+	<FONT FACE="Helvetica Bold" COLOR="white">Borne</FONT></TD>
+	<TD COLSPAN="2" CELLPADDING="4" ALIGN="CENTER" BGCOLOR="{{ colors.head_bornes }}"> 
+	<FONT FACE="Helvetica Bold" COLOR="white">Switch</FONT></TD>
+	<TD COLSPAN="2" CELLPADDING="4" ALIGN="CENTER" BGCOLOR="{{ colors.head_bornes }}"> 
+	<FONT FACE="Helvetica Bold" COLOR="white">Port</FONT></TD>
+</TR>
+{% for borne in sub.bornes %}
+<TR>
+	<TD COLSPAN="2" CELLPADDING="4" ALIGN="CENTER" BORDER="0">
+		<FONT COLOR="{{ colors.texte }}" >{{ borne.name }}</FONT>
+	</TD>
+	<TD COLSPAN="2" CELLPADDING="4" ALIGN="CENTER" BORDER="0">
+		<FONT COLOR="{{ colors.texte }}" >{{ borne.switch }}</FONT>
+	</TD>
+	<TD COLSPAN="2" CELLPADDING="4" ALIGN="CENTER" BORDER="0">
+		<FONT COLOR="{{ colors.texte }}" >{{ borne.port }}</FONT>
+	</TD>
+</TR>
+{% endfor %}
+</TABLE>
+>] "{{sub.bat_name}}bornes";
+{% endblock %}
+{% endif %}
+
+{% if sub.machines %}
+{% block machines %}
+node [label=<
+<TABLE BGCOLOR="{{ colors.back}}" BORDER="0" CELLBORDER="0" CELLSPACING="0">
+<TR>
+	<TD COLSPAN="2" CELLPADDING="4" ALIGN="CENTER" BGCOLOR="{{ colors.head_server }}"> 
+	<FONT FACE="Helvetica Bold" COLOR="white">Machine</FONT></TD>
+	<TD COLSPAN="2" CELLPADDING="4" ALIGN="CENTER" BGCOLOR="{{ colors.head_server }}"> 
+	<FONT FACE="Helvetica Bold" COLOR="white">Switch</FONT></TD>
+	<TD COLSPAN="2" CELLPADDING="4" ALIGN="CENTER" BGCOLOR="{{ colors.head_server }}"> 
+	<FONT FACE="Helvetica Bold" COLOR="white">Port</FONT></TD>
+</TR>
+
+{% for machine in sub.machines %}
+<TR>
+	<TD COLSPAN="2" CELLPADDING="4" ALIGN="CENTER" BORDER="0">
+		<FONT COLOR="{{ colors.texte }}" >{{ machine.name }}</FONT>
+	</TD>
+	<TD COLSPAN="2" CELLPADDING="4" ALIGN="CENTER" BORDER="0">
+		<FONT COLOR="{{ colors.texte }}" >{{ machine.switch }}</FONT>
+	</TD>
+	<TD COLSPAN="2" CELLPADDING="4" ALIGN="CENTER" BORDER="0">
+		<FONT COLOR="{{ colors.texte }}" >{{ machine.port }}</FONT>
+	</TD>
+</TR>
+{% endfor %}
+</TABLE>
+>] "{{sub.bat_name}}machines";
+{% endblock %}
+{% endif %}
+
+
+{% block switchs %}
+{% for switch in sub.switchs %}
+node [label=<
+<TABLE BGCOLOR="{{ colors.back }}" BORDER="0" CELLBORDER="0" CELLSPACING="0">
+<TR><TD COLSPAN="2" CELLPADDING="4" ALIGN="CENTER" BGCOLOR="{{ colors.head }}">
+<FONT FACE="Helvetica Bold" COLOR="white">
+{{ switch.name }}
+</FONT></TD></TR>
+<TR><TD ALIGN="LEFT" BORDER="0">
+<FONT COLOR="{{ colors.texte }}" >Modèle</FONT>
+</TD>
+<TD ALIGN="LEFT">
+<FONT COLOR="{{ colors.texte }}" >{{ switch.model }}</FONT>
+</TD></TR>
+<TR><TD ALIGN="LEFT" BORDER="0">
+<FONT COLOR="{{ colors.texte }}" >Taille</FONT>
+</TD>
+<TD ALIGN="LEFT">
+<FONT COLOR="{{ colors.texte }}" >{{ switch.nombre }}</FONT>
+</TD></TR>
+{% block liens %}
+{% for port in switch.ports %}
+<TR><TD ALIGN="LEFT" BORDER="0">
+<FONT COLOR="{{ colors.texte }}" >{{ port.numero }}</FONT>
+</TD>
+<TD ALIGN="LEFT">
+<FONT COLOR="{{ colors.texte }}" >{{ port.related }}</FONT>
+</TD></TR>
+{% endfor %}
+{% endblock %}
+</TABLE>
+>] "{{ switch.id }}" ;
+{% endfor %}
+{% endblock %}
+}
+{% endfor %}
+{% endblock %}
+
+
+{% block isoles %}
+{% for switchs in alone %}
+"{{switchs.id}}" [label=<
+<TABLE BGCOLOR="{{ colors.back }}" BORDER="0" CELLBORDER="0" CELLSPACING="0">
+<TR><TD COLSPAN="2" CELLPADDING="4" ALIGN="CENTER" BGCOLOR="{{ colors.head }}">
+<FONT FACE="Helvetica Bold" COLOR="white">
+{{switchs.name}}
+</FONT></TD></TR>
+</TABLE>
+>]
+{% endfor %}
+{% endblock %}
+
+
+{% block links %}
+{% for link in links %}
+"{{ link.depart }}" -> "{{ link.arrive }}";
+{% endfor %}
+{% endblock %}
+}
+{% endblock %}

topologie/templates/topologie/index.html

@@ -29,18 +29,39 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 {% block title %}Switchs{% endblock %}
 
 {% block content %}
-<img id="zoom_01" src="/media/images/switchs.png" data-zoom-image="/media/images/switchs.png" width=100% />
 
 <script type="text/javascript" src="/static/js/jquery.ez-plus.js"></script>
-
 <script>
-$("#zoom_01").ezPlus({
+function toggle_graph() {
-    scrollZoom: true,
+    $("#collImg").collapse('toggle');
-    zoomType: 'inner',
+
-    cursor: 'crosshair'
+    ezImg = $("#zoom_01").data("ezPlus");
-});
+    if (ezImg) {
+        ezImg.destroy();
+	$("#zoom_01").removeData("ezPlus");
+    } else {
+        $("#zoom_01").ezPlus({
+            scrollZoom: true,
+            zoomType: 'inner',
+            cursor: 'crosshair'
+        });
+    }
+}
 </script>
 
+
+<button class="btn btn-primary" type="button" onclick="toggle_graph()">
+Topologie des Switchs
+</button>
+
+<a target="_blank" href="/media/images/switchs.png" class="btn btn-primary">
+  <span class="fa fa-arrows-alt"></span> 
+</a>
+
+<div id="collImg" class="collapse" aria-expanded="false">
+<img id="zoom_01" src="/media/images/switchs.png" href="/media/images/switchs.png" target="_blank" data-zoom-image="/media/images/switchs.png" width=100% />
+</div>
+
 <h2>Switchs</h2>
 {% can_create Switch %}
 <a class="btn btn-primary btn-sm" role="button" href="{% url 'topologie:new-switch' %}"><i class="fa fa-plus"></i> Ajouter un switch</a>

topologie/views.py

@@ -43,6 +43,12 @@ from django.db import IntegrityError
 from django.db.models import ProtectedError, Prefetch
 from django.core.exceptions import ValidationError
 from django.contrib.staticfiles.storage import staticfiles_storage
+from django.template.loader import get_template
+from django.template import Context, Template, loader
+from django.db.models.signals import post_save
+from django.dispatch import receiver
+
+import tempfile
 
 from users.views import form
 from re2o.utils import re2o_paginator, SortTable
@@ -53,13 +59,14 @@ from re2o.acl import (
     can_view,
     can_view_all,
 )
+from re2o.settings import MEDIA_ROOT
 from machines.forms import (
     DomainForm,
     EditInterfaceForm,
     AddInterfaceForm
 )
 from machines.views import generate_ipv4_mbf_param
-from machines.models import Interface
+from machines.models import Interface, Service_link
 from preferences.models import AssoOption, GeneralOption
 
 from .models import (
@@ -71,7 +78,8 @@ from .models import (
     ConstructorSwitch,
     AccessPoint,
     SwitchBay,
-    Building
+    Building,
+    Server,
 )
 from .forms import (
     EditPortForm,
@@ -89,7 +97,13 @@ from .forms import (
     EditBuildingForm
 )
 
-from subprocess import Popen,PIPE
+from subprocess import (
+    Popen,
+    PIPE
+)
+
+from os.path import isfile 
+from os import remove
 
 
 @login_required
@@ -112,6 +126,14 @@ def index(request):
     )
     pagination_number = GeneralOption.get_cached_value('pagination_number')
     switch_list = re2o_paginator(request, switch_list, pagination_number)
+
+    if any(service_link.need_regen() for service_link in Service_link.objects.filter(service__service_type='graph_topo')):
+        make_machine_graph()
+        for service_link in Service_link.objects.filter(service__service_type='graph_topo'):
+            service_link.done_regen()
+
+    if not isfile("/var/www/re2o/media/images/switchs.png"):
+        make_machine_graph()
     return render(
         request,
         'topologie/index.html',
@@ -935,95 +957,133 @@ def del_constructor_switch(request, constructor_switch, **_kwargs):
 
 def make_machine_graph():
     """
-    Crée le fichier dot et l'image du graph des Switchs
+    Create the graph of switchs, machines and access points.
     """
-    #Syntaxe DOT temporaire, A mettre dans un template:
+    dico = {
-    lignes=['''digraph Switchs {
+        'subs': [],
-node [
+        'links' : [],
-fontname=Helvetica
+        'alone': [],
-fontsize=8
+        'colors': {
-shape=plaintext]
+            'head': "#7f0505",  # Color parameters for the graph
-edge[arrowhead=odot,arrowtail=dot]''']
+            'back': "#b5adad",
-    node_fixe='''node [label=<
+            'texte': "#563d01",
-<TABLE BGCOLOR="palegoldenrod" BORDER="0" CELLBORDER="0" CELLSPACING="0">
+            'border_bornes': "#02078e",
-<TR><TD COLSPAN="2" CELLPADDING="4" ALIGN="CENTER" BGCOLOR="olivedrab4">
+            'head_bornes': "#25771c",
-<FONT FACE="Helvetica Bold" COLOR="white">
+            'head_server': "#1c3777"
-{}
+            }
-</FONT></TD></TR>
+        }
-<TR><TD ALIGN="LEFT" BORDER="0">
+    missing = list(Switch.objects.all())
-<FONT COLOR="#7B7B7B" >{}</FONT>
+    detected = []
-</TD>
+    for building in Building.objects.all():  # Visit all buildings
-<TD ALIGN="LEFT">
+
-<FONT COLOR="#7B7B7B" >{}</FONT>
+        dico['subs'].append(
-</TD></TR>
+            {
-<TR><TD ALIGN="LEFT" BORDER="0">
+            'bat_id': building.id,
-<FONT COLOR="#7B7B7B" >{}</FONT>
+            'bat_name': building,
-</TD>
+            'switchs': [],
-<TD ALIGN="LEFT">
+            'bornes': [],
-<FONT>{}</FONT>
+            'machines': []
-</TD></TR>'''
+            }
-    node_ports='''<TR><TD ALIGN="LEFT" BORDER="0">
+        )
-<FONT COLOR="#7B7B7B" >{}</FONT>
+        # Visit all switchs in this building
-</TD>
-<TD ALIGN="LEFT">
-<FONT>{}</FONT>
-</TD></TR>'''
-    cluster='''subgraph cluster_{} {{
-color=blue;
-label="Batiment {}";'''
-    end_table='''</TABLE>
->] \"{}_{}\" ;'''
-    switch_alone='''{} [label=<
-<TABLE BGCOLOR="palegoldenrod" BORDER="0" CELLBORDER="0" CELLSPACING="0">
-<TR><TD COLSPAN="2" CELLPADDING="4" ALIGN="CENTER" BGCOLOR="olivedrab4">
-<FONT FACE="Helvetica Bold" COLOR="white">
-{}
-</FONT></TD></TR>
-</TABLE>
->]'''
-    missing=[]
-    detected=[]
-    for sw in Switch.objects.all():
-        if(sw not in detected):
-            missing.append(sw)
-    for building in Building.objects.all():
-        lignes.append(cluster.format(len(lignes),building))
         for switch in Switch.objects.filter(switchbay__building=building):   
-            lignes.append(node_fixe.format(switch.main_interface().domain.name,"Modèle",switch.model,"Nombre de ports",switch.number))
+            dico['subs'][-1]['switchs'].append({
-            for p in switch.ports.all().filter(related__isnull=False):
+                'name': switch.main_interface().domain.name,
-                lignes.append(node_ports.format(p.port,p.related.switch.main_interface().domain.name))
+                'nombre': switch.number,
-            lignes.append(end_table.format(building.id,switch.id))
+                'model': switch.model,
-        lignes.append("}")
+                'id': switch.id,
-    while(missing!=[]):
+                'batiment': building,
-        lignes,new_detected=recursive_switchs(missing[0].ports.all().filter(related=None).first(),None,lignes,[missing[0]])
+                'ports': []
-        missing=[i for i in missing if i not in new_detected]
+            })
-        detected+=new_detected
+            # visit all ports of this switch and add the switchs linked to it
-    for switch in Switch.objects.all().filter(switchbay__isnull=True).exclude(ports__related__isnull=False):
+            for port in switch.ports.filter(related__isnull=False): 
-        lignes.append(switch_alone.format(switch.id,switch.main_interface().domain.name))
+                dico['subs'][-1]['switchs'][-1]['ports'].append({
-    lignes.append("}")
+                    'numero': port.port,
-    fichier = open("media/images/switchs.dot","w")
+                    'related': port.related.switch.main_interface().domain.name
-    for ligne in lignes:
+                })
-        fichier.write(ligne+"\n")
+
-    fichier.close()
+        for ap in AccessPoint.all_ap_in(building):
-    unflatten = Popen(["unflatten","-l", "3", "media/images/switchs.dot"], stdout=PIPE)
+            dico['subs'][-1]['bornes'].append({
-    image = Popen(["dot", "-Tpng", "-o", "media/images/switchs.png"], stdin=unflatten.stdout, stdout=PIPE)
+                'name': ap.short_name,
+                'switch': ap.switch()[0].main_interface().domain.name,
+                'port': ap.switch()[0].ports.filter(
+                    machine_interface__machine=ap
+                )[0].port
+            })
+        for server in Server.all_server_in(building):
+            dico['subs'][-1]['machines'].append({
+                'name': server.short_name,
+                'switch': server.switch()[0].main_interface().domain.name,
+                'port': Port.objects.filter(machine_interface__machine=server)[0].port
+            })
+
+    # While the list of forgotten ones is not empty
+    while missing:
+        if missing[0].ports.count():  # The switch is not empty
+            links, new_detected = recursive_switchs(missing[0], None, [missing[0]])
+            for link in links:
+                dico['links'].append(link)
+            # Update the lists of missings and already detected switchs
+            missing=[i for i in missing if i not in new_detected]
+            detected += new_detected
+        else:  # If the switch have no ports, don't explore it and hop to the next one
+            del missing[0]
+    # Switchs that are not connected or not in a building
+    for switch in Switch.objects.filter(switchbay__isnull=True).exclude(ports__related__isnull=False):
+        dico['alone'].append({
+            'id': switch.id,
+            'name': switch.main_interface().domain.name
+        })
 
 
-def recursive_switchs(port_start, switch_before, lignes,detected):
+    dot_data=generate_dot(dico,'topologie/graph_switch.dot')  # generate the dot file
-    """
+
-    Parcour récursivement le switchs auquel appartient port_start pour trouver les ports suivants liés
+    f = tempfile.NamedTemporaryFile(mode='w+', encoding='utf-8', delete=False)  # Create a temporary file to store the dot data
-    """
+    with f:
-    l_ports=port_start.switch.ports.filter(related__isnull=False)
+            f.write(dot_data)
-    for port in l_ports:
+    unflatten = Popen(  # unflatten the graph to make it look better
-        if port.related.switch!=switch_before and port.related.switch!=port.switch:
+            ["unflatten","-l", "3", f.name],
-            links=[]
+        stdout=PIPE
-            for sw in [switch for switch in [port_start.switch,port.related.switch]]:
+    )
-                if(sw not in detected):
+    image = Popen(  # pipe the result of the first command into the second
-                    detected.append(sw)
+        ["dot", "-Tpng", "-o", MEDIA_ROOT + "/images/switchs.png"],
-                if(sw.switchbay.building):
+        stdin=unflatten.stdout,
-                    links.append("\"{}_{}\"".format(sw.switchbay.building.id,sw.id))
+        stdout=PIPE
-                else:
+    )
-                    links.append("\"{}\"".format(sw.id))
+
-            lignes.append(links[0]+" -> "+links[1])
+def generate_dot(data,template):
-            lignes, detected = recursive_switchs(port.related, port_start.switch, lignes, detected)
+    """create the dot file
-    return (lignes, detected)
+    :param data: dictionary passed to the template
+    :param template: path to the dot template
+    :return: all the lines of the dot file"""
+    t = loader.get_template(template)
+    if not isinstance(t, Template) and not (hasattr(t, 'template') and isinstance(t.template, Template)):
+        raise Exception("Le template par défaut de Django n'est pas utilisé."
+                        "Cela peut mener à des erreurs de rendu."
+                        "Vérifiez les paramètres")
+    c = Context(data).flatten()
+    dot = t.render(c)
+    return(dot)
+
+def recursive_switchs(switch_start, switch_before, detected):
+    """Visit the switch and travel to the switchs linked to it.
+    :param switch_start: the switch to begin the visit on
+    :param switch_before: the switch that you come from. None if switch_start is the first one
+    :param detected: list of all switchs already visited. None if switch_start is the first one
+    :return: A list of all the links found and a list of all the switchs visited"""
+    links_return=[]  # list of dictionaries of the links to be detected
+    for port in switch_start.ports.filter(related__isnull=False):  # Ports that are related to another switch
+        if port.related.switch != switch_before and port.related.switch != port.switch:  # Not the switch that we come from, not the current switch
+            links = {  # Dictionary of a link
+                'depart':switch_start.id,
+                'arrive':port.related.switch.id
+            }
+            if port.related.switch not in detected:  # The switch at the end of this link has not been visited
+                links_down, detected = recursive_switchs(port.related.switch, switch_start, detected)  # explore it and get the results
+                for link in links_down:  # Add the non empty links to the current list
+                    if link:
+                        links_return.append(link) 
+            links_return.append(links)  # Add current and below levels links
+    detected.append(switch_start)  # This switch is considered detected
+    return (links_return, detected)
+