server: add ".count" modifier for node fields

i.e. http://batcave:8888/node/010203040506/clients.count

ffstatus/server.py

@@ -65,7 +65,7 @@ class BatcaveHttpRequestHandler(BaseHTTPRequestHandler):
 
 		# /node/<id>.json - node's data
 		# /node/<id>/field - return specific field from node's data
-		m = re.match(r'node/([a-f0-9]{12})(?P<cmd>\.json|/[a-zA-Z0-9_\-]+)$', path)
+		m = re.match(r'node/([a-f0-9]{12})(?P<cmd>\.json|/[a-zA-Z0-9_\-\.]+)$', path)
 		if m != None:
 			cmd = m.group('cmd')
 			if cmd == '.json':
@@ -263,13 +263,19 @@ class BatcaveHttpRequestHandler(BaseHTTPRequestHandler):
 			self.send_error(404, 'No node with id \'' + nodeid + '\' present.')
 			return
 
+		return_count = False
+		if field.endswith('.count'):
+			return_count = True
+			field = field[0:-6]
+
 		if not field in node:
 			self.send_error(404, 'The node \'' + nodeid + '\' does not have a field named \'' + str(field) + '\'.')
 			return
 
 		value = node[field]
+		if return_count: value = len(value)
 
-		self.send_headers('text/plain' if isinstance(value, basestring) else 'text/json')
+		self.send_headers('text/plain' if isinstance(value, basestring) or isinstance(value, int) else 'text/json')
 		self.wfile.write(value if isinstance(value, basestring) else json.dumps(value))
 
 	def respond_vpn(self, query):