Added detection of device busy condition

Added a lock file to ensure that only one instance of the GUI runs

libprs500/communicate.py

@@ -221,8 +221,12 @@ class PRS500Device(object):
     self.device = self.device_descriptor.getDevice()
     if not self.device:
       raise DeviceError()
+    try:
       self.handle = self.device.open()
       self.handle.claimInterface(self.device_descriptor.interface_id)
+    except usb.USBError, e:
+      print >>sys.stderr, e
+      raise DeviceBusy()
     res = self._send_validated_command(GetUSBProtocolVersion(), timeout=20000) # Large timeout as device may still be initializing
     if res.code != 0: raise ProtocolError("Unable to get USB Protocol version.")
     version = self._bulk_read(24, data_type=USBProtocolVersion)[0].version
@@ -236,8 +240,10 @@ class PRS500Device(object):
     
   def close(self):    
     """ Release device interface """
+    try:
       self.handle.reset()
       self.handle.releaseInterface()
+    except: pass
     self.handle, self.device = None, None
     
   def _send_command(self, command, response_type=Response, timeout=1000):

libprs500/errors.py

@@ -34,6 +34,11 @@ class DeviceError(ProtocolError):
   def __init__(self):
     ProtocolError.__init__(self, "Unable to find SONY Reader. Is it connected?")
     
+class DeviceBusy(ProtocolError):
+  """ Raised when device is busy """
+  def __init__(self):
+    ProtocolError.__init__(self, "Device is in use by another application")
+    
 class PacketError(ProtocolError):
   """ Errors with creating/interpreting packets """
   

libprs500/gui/__init__.py

@@ -14,6 +14,7 @@
 ##    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 __docformat__ = "epytext"
 __author__       = "Kovid Goyal <kovid@kovidgoyal.net>"
+APP_TITLE         = "libprs500"
 
 import pkg_resources, sys, os, re, StringIO, traceback
 from PyQt4 import QtCore, QtGui                    # Needed for classes imported with import_ui
@@ -28,7 +29,7 @@ def installErrorHandler(dialog):
   global error_dialog
   error_dialog = dialog
   error_dialog.resize(600, 400)
-  error_dialog.setWindowTitle("SONY Reader - Error")
+  error_dialog.setWindowTitle(APP_TITLE + " - Error")
   error_dialog.setModal(True)
     
 

libprs500/gui/main.py

@@ -20,12 +20,12 @@ from PyQt4 import uic
 from libprs500.communicate import PRS500Device as device
 from libprs500.errors import *
 from libprs500.lrf.meta import LRFMetaFile, LRFException
-from libprs500.gui import import_ui, installErrorHandler, Error, Warning, extension
+from libprs500.gui import import_ui, installErrorHandler, Error, Warning, extension, APP_TITLE
 from libprs500.gui.widgets import LibraryBooksModel, DeviceBooksModel, DeviceModel, TableView
 from database import LibraryDatabase
 from editbook import EditBookDialog
 
-import sys, re, os, traceback
+import sys, re, os, traceback, tempfile
 
 DEFAULT_BOOK_COVER = None
 LIBRARY_BOOK_TEMPLATE = QString("<table><tr><td><b>Formats:</b> %1 </td><td><b>Tags:</b> %2</td></tr><tr><td><b>Comments:</b>%3</td></tr></table>")
@@ -102,7 +102,7 @@ class MainWindow(QObject, Ui_MainWindow):
   
   def delete(self, action):
     count = str(len(self.current_view.selectionModel().selectedRows()))
-    ret = QMessageBox.question(self.window, self.trUtf8("SONY Reader - confirm"),  self.trUtf8("Are you sure you want to <b>permanently delete</b> these ") +count+self.trUtf8(" item(s)?"), QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)
+    ret = QMessageBox.question(self.window, self.trUtf8(APP_TITLE + " - confirm"),  self.trUtf8("Are you sure you want to <b>permanently delete</b> these ") +count+self.trUtf8(" item(s)?"), QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)
     if ret != QMessageBox.Yes: return
     self.window.setCursor(Qt.WaitCursor)
     if self.library_view.isVisible():
@@ -342,7 +342,7 @@ class MainWindow(QObject, Ui_MainWindow):
   def device_removed(self, timeout=False):
     """ @todo: only reset stuff if library is not shown """
     self.is_connected = False
-    self.df.setText("SONY Reader: <br><br>Storage card:")
+    self.df.setText(self.df_template.arg("").arg("").arg(""))
     self.device_tree.hide_reader(True)
     self.device_tree.hide_card(True)
     self.book_cover.hide()
@@ -368,13 +368,15 @@ class MainWindow(QObject, Ui_MainWindow):
     self.status("Connecting to device")        
     try:
       info = self.dev.get_device_information(end_session=False)
+    except DeviceBusy, e:
+      qFatal(str(e))
     except DeviceError:
       self.dev.reconnect()
       return    
     except ProtocolError, e: 
       traceback.print_exc(e)
       qFatal("Unable to connect to device. Please try unplugging and reconnecting it")
-    self.df.setText(self.df_template.arg(info[0]).arg(info[1]).arg(info[2]))
+    self.df.setText(self.df_template.arg("Connected: "+info[0]).arg(info[1]).arg(info[2]))
     space = self.dev.available_space(end_session=False)  
     sc = space[1][1] if space[1][1] else space[2][1]    
     self.device_tree.model().update_free_space(space[0][1], sc)
@@ -395,6 +397,11 @@ class MainWindow(QObject, Ui_MainWindow):
 def main():
     from optparse import OptionParser
     from libprs500 import __version__ as VERSION
+    lock = os.path.join(tempfile.gettempdir(),"libprs500_gui_lock")
+    if os.access(lock, os.F_OK):
+      print >>sys.stderr, "Another instance of", APP_TITLE, "is running"
+      print >>sys.stderr, "If you are sure this is not the case then manually delete the file", lock
+      sys.exit(1)
     parser = OptionParser(usage="usage: %prog [options]", version=VERSION)
     parser.add_option("--log-packets", help="print out packet stream to stdout. "+\
                     "The numbers in the left column are byte offsets that allow the packet size to be read off easily.", \
@@ -405,12 +412,17 @@ def main():
     global DEFAULT_BOOK_COVER
     DEFAULT_BOOK_COVER = QPixmap(":/default_cover")
     window = QMainWindow()
+    window.setWindowTitle(APP_TITLE)
     window.setWindowIcon(QIcon(":/icon"))
     installErrorHandler(QErrorMessage(window))
     QCoreApplication.setOrganizationName("KovidsBrain")
-    QCoreApplication.setApplicationName("SONY Reader")
+    QCoreApplication.setApplicationName(APP_TITLE)
     gui = MainWindow(window, options.log_packets)    
+    f = open(lock, "w")
+    f.close()
+    try:
       ret = app.exec_()    
+    finally: os.remove(lock)
     return ret
     
 if __name__ == "__main__": main()

libprs500/gui/main.ui

@@ -19,7 +19,10 @@
    </sizepolicy>
   </property>
   <property name="windowTitle" >
-   <string>SONY Reader</string>
+   <string/>
+  </property>
+  <property name="windowIcon" >
+   <iconset resource="images.qrc" >:/images/library.png</iconset>
   </property>
   <widget class="QWidget" name="centralwidget" >
    <layout class="QVBoxLayout" >
@@ -60,7 +63,7 @@
          <enum>Qt::ScrollBarAlwaysOff</enum>
         </property>
         <property name="dragDropMode" >
-         <enum>QAbstractItemView::DropOnly</enum>
+         <enum>QAbstractItemView::DragDrop</enum>
         </property>
         <property name="flow" >
          <enum>QListView::TopToBottom</enum>
@@ -84,11 +87,14 @@
          </sizepolicy>
         </property>
         <property name="text" >
-         <string>&lt;b>libprs500&lt;/b> was created by &lt;b>Kovid Goyal&lt;/b> &amp;copy; 2006&lt;br>&lt;br>%1 %2 %3</string>
+         <string>For help visit &lt;a href="http://libprs500.kovidgoyal.net">http://libprs500.kovidgoyal.net&lt;/a>&lt;br>&lt;br>&lt;b>libprs500&lt;/b> was created by &lt;b>Kovid Goyal&lt;/b> &amp;copy; 2006&lt;br>%1 %2 %3</string>
         </property>
         <property name="textFormat" >
          <enum>Qt::RichText</enum>
         </property>
+        <property name="openExternalLinks" >
+         <bool>true</bool>
+        </property>
        </widget>
       </item>
      </layout>
@@ -275,8 +281,8 @@
   <widget class="QToolBar" name="tool_bar" >
    <property name="minimumSize" >
     <size>
-     <width>49</width>
+     <width>163</width>
-     <height>37</height>
+     <height>58</height>
     </size>
    </property>
    <property name="movable" >
@@ -291,6 +297,9 @@
      <height>22</height>
     </size>
    </property>
+   <property name="toolButtonStyle" >
+    <enum>Qt::ToolButtonTextUnderIcon</enum>
+   </property>
    <attribute name="toolBarArea" >
     <number>4</number>
    </attribute>
@@ -303,7 +312,7 @@
     <iconset resource="images.qrc" >:/images/plus.png</iconset>
    </property>
    <property name="text" >
-    <string>Add files to Library</string>
+    <string>Add books to Library</string>
    </property>
    <property name="shortcut" >
     <string>A</string>
@@ -317,7 +326,7 @@
     <iconset resource="images.qrc" >:/images/minus.png</iconset>
    </property>
    <property name="text" >
-    <string>Delete selected items</string>
+    <string>Delete books</string>
    </property>
    <property name="shortcut" >
     <string>Del</string>
@@ -328,7 +337,7 @@
     <iconset resource="images.qrc" >:/images/edit.png</iconset>
    </property>
    <property name="text" >
-    <string>Edit meta-information for the currently selected items</string>
+    <string>Edit meta-information</string>
    </property>
    <property name="shortcut" >
     <string>E</string>

libprs500/gui/widgets.py

@@ -116,9 +116,7 @@ class FileDragAndDrop(object):
         urls.append(urlunparse(('file', quote(gethostname()), quote(str(file.name)), '','','')))
         self._dragged_files.append(file)      
       mime_data.setData("text/uri-list", QByteArray("\n".join(urls)))
-      user = None
+      user = os.getenv['USER']
-      try: user = os.environ['USER']
-      except: pass
       if user: mime_data.setData("text/x-xdnd-username", QByteArray(user))
       drag.setMimeData(mime_data)
       return drag