add the starting work on checking for changes..

requirements.txt

@@ -1,2 +1,3 @@
 pysnmp
 coverage
+mock

test_data.py

@@ -0,0 +1,29 @@
+import vlanmang
+
+##############
+###  Data  ###
+##############
+vlans = {
+	1:	'def',
+	5:	'vlana',
+	283:	'vlanb',
+}
+
+def rng(s, e):
+        return range(s, e + 1)
+
+distributionswitch = {
+	1:	{
+		'u':	[ 'lag1', 20, 21 ],
+	},
+	5:	{
+		'u':	rng(1,8),
+		't':	[ 'lag1', 20, 21],
+	},
+	283:	{
+		'u':	rng(9,19) + [ 22, 23 ],
+		't':	[ 'lag1' ]
+	},
+}
+
+distswitch = vlanmang.SwitchConfig('192.168.0.58', 'private', distributionswitch)

vlanmang.py

@@ -5,7 +5,9 @@ from pysnmp.hlapi import *
 from pysnmp.smi.builder import MibBuilder
 from pysnmp.smi.view import MibViewController
 
+import importlib
 import itertools
+import mock
 import random
 import unittest
 
@@ -32,6 +34,32 @@ _mvc = MibViewController(_mbuilder)
 # LLDP:
 # 1.0.8802.1.1.2.1.4.1.1 aka LLDP-MIB, lldpRemTable
 
+class SwitchConfig(object):
+	def __init__(self, host, community, vlanconf):
+		self._host = host
+		self._community = community
+		self._vlanconf = vlanconf
+
+	@property
+	def host(self):
+		return self._host
+
+	@property
+	def community(self):
+		return self._community
+
+	@property
+	def vlanconf(self):
+		return self._vlanconf
+
+def checkchanges(module):
+	mod = importlib.import_module(module)
+	mods = [ i for i in mod.__dict__.itervalues() if isinstance(i, SwitchConfig) ]
+
+	for i in mods:
+		switch = SNMPSwitch(i.host, i.community)
+		portmapping = switch.getportmapping()
+
 def getpvidmapping(data, lookupfun):
 	'''Return a mapping from vlan based table to a port: vlan
 	dictionary.'''
@@ -134,6 +162,12 @@ class SNMPSwitch(object):
 				for varBind in varBinds:
 					yield varBind
 
+	def getportmapping(self):
+		'''Return a port name mapping.  Keys are the port index
+		and the value is the name from the ifName entry.'''
+
+		return dict((x[0][-1], str(x[1])) for x in self._walk('IF-MIB', 'ifName'))
+
 	def findport(self, name):
 		'''Look up a port name and return it's port index.  This
 		looks up via the ifName table in IF-MIB.'''
@@ -170,6 +204,11 @@ class SNMPSwitch(object):
 		return (x[0][-1] for x in self._walk('Q-BRIDGE-MIB', 'dot1qVlanStaticName'))
 
 class _TestMisc(unittest.TestCase):
+	def setUp(self):
+		import test_data
+
+		self._test_data = test_data
+
 	def test_pvid(self):
 		data = {
 			1: {
@@ -199,6 +238,19 @@ class _TestMisc(unittest.TestCase):
 		self.assertEqual(getportlist(data, lookup.__getitem__),
 		    set(xrange(1, 11)) | set(xrange(13, 20)) | set([30]))
 
+	@mock.patch('vlanmang.SNMPSwitch.getportmapping')
+	@mock.patch('importlib.import_module')
+	def test_checkchanges(self, imprt, portmapping):
+		def tmp(*args, **kwargs):
+			print `args`
+			return self._test_data
+		imprt.side_effect = tmp
+
+		checkchanges('data')
+
+		imprt.assert_called_with('data')
+		portmapping.assert_called()
+
 _skipSwitchTests = True
 
 class _TestSwitch(unittest.TestCase):
@@ -206,17 +258,27 @@ class _TestSwitch(unittest.TestCase):
 		args = open('test.creds').read().split()
 		self.switch = SNMPSwitch(*args)
 
-	def test_unpacktable(self):
-		pass
+		switchmodel = self.switch._get(('ENTITY-MIB',
+		    'entPhysicalModelName', 1))
+		if switchmodel != 'GS108T smartSwitch' or \
+		    _skipSwitchTests: # pragma: no cover
+			self.skipTest('Need a GS108T switch to run these tests')
 
-	@unittest.skipIf(_skipSwitchTests, 'slow')
 	def test_misc(self):
 		switch = self.switch
 
 		self.assertEqual(switch.findport('g1'), 1)
 		self.assertEqual(switch.findport('l1'), 14)
 
-	@unittest.skipIf(_skipSwitchTests, 'slow')
+	def test_portnames(self):
+		switch = self.switch
+
+		resp = dict((x, 'g%d' % x) for x in xrange(1, 9))
+		resp.update({ 13: 'cpu' })
+		resp.update((x, 'l%d' % (x - 13)) for x in xrange(14, 18))
+
+		self.assertEqual(switch.getportmapping(), resp)
+
 	def test_vlan(self):
 		switch = self.switch