From a5c91b4711f9b4e13b9cc32d0fef3ea0b61b0e9f Mon Sep 17 00:00:00 2001
From: Kali Kaneko <kali@leap.se>
Date: Mon, 22 Jul 2013 21:35:21 +0200
Subject: use rates in display

---
 changes/feature_2913_traffic_rates |  1 +
 src/leap/gui/statuspanel.py        | 99 +++++++++++++++++++++++++++++++++++---
 src/leap/gui/ui/statuspanel.ui     |  4 +-
 3 files changed, 96 insertions(+), 8 deletions(-)
 create mode 100644 changes/feature_2913_traffic_rates

diff --git a/changes/feature_2913_traffic_rates b/changes/feature_2913_traffic_rates
new file mode 100644
index 00000000..75ebf247
--- /dev/null
+++ b/changes/feature_2913_traffic_rates
@@ -0,0 +1 @@
+  o Use traffic rates instead of totals. Closes #2913
diff --git a/src/leap/gui/statuspanel.py b/src/leap/gui/statuspanel.py
index dcb6e802..04fc6818 100644
--- a/src/leap/gui/statuspanel.py
+++ b/src/leap/gui/statuspanel.py
@@ -20,17 +20,68 @@ Status Panel widget implementation
 """
 import logging
 
+from datetime import datetime
 from functools import partial
 from PySide import QtCore, QtGui
 
 from ui_statuspanel import Ui_StatusPanel
+
+from leap.common.check import leap_assert_type
 from leap.services.eip.vpnprocess import VPNManager
 from leap.platform_init import IS_WIN, IS_LINUX
-from leap.common.check import leap_assert_type
+from leap.util import first
 
 logger = logging.getLogger(__name__)
 
 
+class RateMovingAverage(object):
+    """
+    Moving window average for calculating
+    upload and download rates.
+    """
+    SAMPLE_SIZE = 5
+
+    def __init__(self):
+        """
+        Initializes an empty array of fixed size
+        """
+        self._data = [None for i in xrange(self.SAMPLE_SIZE)]
+
+    def append(self, x):
+        """
+        Appends a new data point to the collection.
+
+        :param x: A tuple containing timestamp and traffic points
+                  in the form (timestamp, traffic)
+        :type x: tuple
+        """
+        self._data.pop(0)
+        self._data.append(x)
+
+    def get(self):
+        """
+        Gets the collection.
+        """
+        return self._data
+
+    def get_average(self):
+        """
+        Gets the moving average.
+        """
+        data = filter(None, self.get())
+        traff = [traffic for (ts, traffic) in data]
+        times = [ts for (ts, traffic) in data]
+
+        deltatraffic = traff[-1] - first(traff)
+        deltat = (times[-1] - first(times)).seconds
+
+        try:
+            rate = float(deltatraffic) / float(deltat) / 1024
+        except ZeroDivisionError:
+            rate = 0
+        return rate
+
+
 class StatusPanelWidget(QtGui.QWidget):
     """
     Status widget that displays the current state of the LEAP services
@@ -63,6 +114,40 @@ class StatusPanelWidget(QtGui.QWidget):
         self.ERROR_ICON_TRAY = None
         self._set_eip_icons()
 
+        self._set_traffic_rates()
+
+    def _set_traffic_rates(self):
+        """
+        Initializes up and download rates.
+        """
+        self._up_rate = RateMovingAverage()
+        self._down_rate = RateMovingAverage()
+
+    def _update_traffic_rates(self, up, down):
+        """
+        Updates up and download rates.
+
+        :param up: upload total.
+        :type up: int
+        :param down: download total.
+        :type down: int
+        """
+        ts = datetime.now()
+        self._up_rate.append((ts, up))
+        self._down_rate.append((ts, down))
+
+    def _get_traffic_rates(self):
+        """
+        Gets the traffic rates.
+
+        :returns: a tuple with the (up, down) rates
+        :rtype: tuple
+        """
+        up = self._up_rate
+        down = self._down_rate
+
+        return (up.get_average(), down.get_average())
+
     def _set_eip_icons(self):
         """
         Sets the EIP status icons for the main window and for the tray
@@ -221,12 +306,14 @@ class StatusPanelWidget(QtGui.QWidget):
         by the VPN thread
         """
         upload = float(data[VPNManager.TUNTAP_WRITE_KEY] or "0")
-        upload = upload / 1000.0
-        upload_str = "%12.2f Kb" % (upload,)
-        self.ui.lblUpload.setText(upload_str)
         download = float(data[VPNManager.TUNTAP_READ_KEY] or "0")
-        download = download / 1000.0
-        download_str = "%12.2f Kb" % (download,)
+        self._update_traffic_rates(upload, download)
+        uprate, downrate = self._get_traffic_rates()
+
+        upload_str = "%14.2f KB/s" % (uprate,)
+        self.ui.lblUpload.setText(upload_str)
+
+        download_str = "%14.2f KB/s" % (downrate,)
         self.ui.lblDownload.setText(download_str)
 
     def update_vpn_state(self, data):
diff --git a/src/leap/gui/ui/statuspanel.ui b/src/leap/gui/ui/statuspanel.ui
index 1a2c77ad..fd675d35 100644
--- a/src/leap/gui/ui/statuspanel.ui
+++ b/src/leap/gui/ui/statuspanel.ui
@@ -142,7 +142,7 @@
         <item>
          <widget class="QLabel" name="lblUpload">
           <property name="text">
-           <string>0.0 Kb</string>
+	   <string>0.0 KB/s</string>
           </property>
          </widget>
         </item>
@@ -175,7 +175,7 @@
         <item>
          <widget class="QLabel" name="lblDownload">
           <property name="text">
-           <string>0.0 Kb</string>
+	   <string>0.0 KB/s</string>
           </property>
          </widget>
         </item>
-- 
cgit v1.2.3