From f022da5cdbb8a128ccc4b11a2056ca711e984e6b Mon Sep 17 00:00:00 2001
From: "Kali Kaneko (leap communications)" <kali@leap.se>
Date: Thu, 15 Jun 2017 00:31:29 +0200
Subject: [refactor] use constants for state transitions

---
 src/leap/bitmask/vpn/_status.py | 79 ++++++++++++++++++++---------------------
 1 file changed, 38 insertions(+), 41 deletions(-)

diff --git a/src/leap/bitmask/vpn/_status.py b/src/leap/bitmask/vpn/_status.py
index c408883..7cd4896 100644
--- a/src/leap/bitmask/vpn/_status.py
+++ b/src/leap/bitmask/vpn/_status.py
@@ -4,13 +4,16 @@ from ._human import bytes2human
 from leap.common.events import catalog, emit_async
 
 
-# TODO implement a state machine in this class
+# TODO implement a more explicit state machine
+# TODO check good transitions
+# TODO check valid states
 
 
 class VPNStatus(object):
     """
     A class containing different patterns in the openvpn output that
-    we can react upon.
+    we can react upon. The patterns drive an internal state machine that can be
+    queried through the ``status`` property.
     """
 
     _events = {
@@ -21,25 +24,31 @@ class VPNStatus(object):
         'INITIALIZATION_COMPLETED': (
             "Initialization Sequence Completed",),
     }
+    _STARTING = ('AUTH', 'WAIT', 'CONNECTING', 'GET_CONFIG',
+                 'ASSIGN_IP', 'ADD_ROUTES', 'RECONNECTING')
+    _STOPPING = ("EXITING",)
+    _CONNECTED = ("CONNECTED",)
 
     def __init__(self):
         self._status = 'off'
         self.errcode = None
         self._traffic_down = None
         self._traffic_up = None
-
-    def watch(self, line):
-        """
-        Inspects line searching for the different patterns. If a match
-        is found, try to emit the corresponding signal.
-
-        :param line: a line of openvpn output
-        :type line: str
-        """
-        chained_iter = chain(*[
+        self._chained_iter = chain(*[
             zip(repeat(key, len(l)), l)
             for key, l in self._events.iteritems()])
-        for event, pattern in chained_iter:
+
+    def _status_codes(self, event):
+
+        _table = {
+            "network_unreachable": ('off', 'network unreachable'),
+            "process_restart_tls": ('starting', 'restart tls'),
+            "initialization_completed": ('on', None)
+        }
+        return _table.get(event.lower())
+
+    def watch(self, line):
+        for event, pattern in self._chained_iter:
             if pattern in line:
                 break
         else:
@@ -48,24 +57,27 @@ class VPNStatus(object):
         status, errcode = self._status_codes(event)
         self.set_status(status, errcode)
 
+    @property
+    def status(self):
+        status = self.get_traffic_status()
+        status.update({
+            'status': self._status,
+            'error': self.errcode
+        })
+        return status
+
     def set_status(self, status, errcode):
-        if status in ("AUTH", "WAIT", "CONNECTING", "GET_CONFIG",
-                      "ASSIGN_IP", "ADD_ROUTES", "RECONNECTING"):
+        if status in self._STARTING:
             status = "starting"
-        elif status == "EXITING":
+        elif status in self._STOPPING:
             status = "stopping"
-        elif status == "CONNECTED":
+        elif status in self._CONNECTED:
             status = "on"
 
         self._status = status
         self.errcode = errcode
         emit_async(catalog.VPN_STATUS_CHANGED)
 
-    def set_traffic_status(self, status):
-        up, down = status
-        self._traffic_up = up
-        self._traffic_down = down
-
     def get_traffic_status(self):
         down = None
         up = None
@@ -75,22 +87,7 @@ class VPNStatus(object):
             up = bytes2human(self._traffic_up)
         return {'down': down, 'up': up}
 
-    @property
-    def status(self):
-        status = self.get_traffic_status()
-        status.update({
-            'status': self._status,
-            'error': self.errcode
-        })
-        return status
-
-    def _status_codes(self, event):
-        # TODO check good transitions
-        # TODO check valid states
-
-        _table = {
-            "network_unreachable": ('off', 'network unreachable'),
-            "process_restart_tls": ('starting', 'restart tls'),
-            "initialization_completed": ('on', None)
-        }
-        return _table.get(event.lower())
+    def set_traffic_status(self, status):
+        up, down = status
+        self._traffic_up = up
+        self._traffic_down = down
-- 
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