Add an interface to permit starting and stopping of devices without disabling them. Will be used by the smartdevice driver

src/calibre/devices/interface.py

@@ -514,6 +514,54 @@ class DevicePlugin(Plugin):
         '''
         pass
 
+    # Dynamic control interface
+
+    def is_dynamically_controllable(self):
+        '''
+        Called by the device manager when starting plugins. If this method returns
+        a string, then a) it supports the device manager's dynamic control
+        interface, and b) that name is to be used when talking to the plugin
+        '''
+        return None
+
+    def start_plugin(self):
+        '''
+        This method is called to start the plugin. The plugin should begin
+        to accept device connections however it does that. If the plugin is
+        already accepting connections, then do nothing.
+        '''
+        pass
+
+    def stop_plugin(self):
+        '''
+        This method is called to stop the plugin. The plugin should no longer
+        accept connections, and should cleanup behind itself. It is likely that
+        this method should call shutdown. If the plugin is already not accepting
+        connections, then do nothing.
+        '''
+        pass
+
+    def get_option(self, opt_string):
+        '''
+        Return the value of the option indicated by opt_string. This method can
+        be called when the plugin is not started. Return None if the option does
+        not exist.
+        '''
+        return None
+
+    def set_option(self, opt_string, opt_value):
+        '''
+        Set the value of the option indicated by opt_string. This method can
+        be called when the plugin is not started.
+        '''
+        pass
+
+    def is_running(self):
+        '''
+        Return True if the plugin is started, otherwise false
+        '''
+        return False
+
 class BookList(list):
     '''
     A list of books. Each Book object must have the fields

src/calibre/gui2/actions/device.py

@@ -24,6 +24,7 @@ class ShareConnMenu(QMenu): # {{{
 
     config_email = pyqtSignal()
     toggle_server = pyqtSignal()
+    toggle_smartdevice = pyqtSignal()
     dont_add_to = frozenset(['context-menu-device'])
 
     def __init__(self, parent=None):
@@ -56,6 +57,11 @@ class ShareConnMenu(QMenu): # {{{
             _('Start Content Server'))
         self.toggle_server_action.triggered.connect(lambda x:
                 self.toggle_server.emit())
+        self.toggle_smartdevice_action = \
+            self.addAction(QIcon(I('devices/galaxy_s3.png')),
+            _('Start Smart Device Connections'))
+        self.toggle_smartdevice_action.triggered.connect(lambda x:
+                self.toggle_smartdevice.emit())
         self.addSeparator()
 
         self.email_actions = []
@@ -80,6 +86,15 @@ class ShareConnMenu(QMenu): # {{{
             text = _('Stop Content Server') + ' [%s]'%get_external_ip()
         self.toggle_server_action.setText(text)
 
+    def smartdevice_state_changed(self, accepting):
+        if accepting:
+            self.toggle_smartdevice_action.setText(_('Stop Smart Device Connections'))
+        else:
+            self.toggle_smartdevice_action.setText(_('Start Smart Device Connections'))
+
+    def hide_smartdevice_menus(self):
+        self.toggle_smartdevice_action.setVisible(False)
+
     def build_email_entries(self, sync_menu):
         from calibre.gui2.device import DeviceAction
         for ac in self.email_actions:
@@ -158,6 +173,7 @@ class ConnectShareAction(InterfaceAction):
     def genesis(self):
         self.share_conn_menu = ShareConnMenu(self.gui)
         self.share_conn_menu.toggle_server.connect(self.toggle_content_server)
+        self.share_conn_menu.toggle_smartdevice.connect(self.toggle_smartdevice)
         self.share_conn_menu.config_email.connect(partial(
             self.gui.iactions['Preferences'].do_config,
             initial_plugin=('Sharing', 'Email')))
@@ -200,8 +216,23 @@ class ConnectShareAction(InterfaceAction):
             if not self.stopping_msg.isVisible():
                 self.stopping_msg.exec_()
             return
-
-
         self.gui.content_server = None
         self.stopping_msg.accept()
 
+    def toggle_smartdevice(self):
+        info_dialog(self.gui, _('Foobar'),
+                    _('Start server bla bla blah...'),
+                    show_copy_button=False, show=True)
+        if self.gui.device_manager.is_running('smartdevice'):
+            self.gui.device_manager.stop_plugin('smartdevice')
+        else:
+            self.gui.device_manager.start_plugin('smartdevice')
+        self.share_conn_menu.smartdevice_state_changed(
+                            self.gui.device_manager.is_running('smartdevice'))
+
+    def smartdevice_state_changed(self, running):
+        self.share_conn_menu.smartdevice_state_changed(running)
+
+    def check_smartdevice_menus(self):
+        if not self.gui.device_manager.is_enabled('smartdevice'):
+            self.share_conn_menu.hide_smartdevice_menus()

src/calibre/gui2/device.py

@@ -145,6 +145,8 @@ class DeviceManager(Thread): # {{{
         self._device_information = None
         self.current_library_uuid = None
         self.call_shutdown_on_disconnect = False
+        self.devices_initialized = Queue.Queue(0)
+        self.dynamic_plugins = {}
 
     def report_progress(self, *args):
         pass
@@ -286,6 +288,10 @@ class DeviceManager(Thread): # {{{
         # Do any device-specific startup processing.
         for d in self.devices:
             self.run_startup(d)
+            n = d.is_dynamically_controllable()
+            if n:
+                self.dynamic_plugins[n] = d
+        self.devices_initialized.put(None)
 
         while self.keep_going:
             kls = None
@@ -508,6 +514,59 @@ class DeviceManager(Thread): # {{{
         if self.connected_device:
             self.connected_device.set_driveinfo_name(location_code, name)
 
+    # dynamic plugin interface
+
+    def start_plugin(self, name):
+        try:
+            d = self.dynamic_plugins.get(name, None)
+            if d:
+                d.start_plugin()
+        except:
+            pass
+
+    def stop_plugin(self, name):
+        try:
+            d = self.dynamic_plugins.get(name, None)
+            if d:
+                d.stop_plugin()
+        except:
+            pass
+
+    def get_option(self, name, opt_string):
+        try:
+            d = self.dynamic_plugins.get(name, None)
+            if d:
+                return d.get_option(opt_string)
+        except:
+            pass
+        return None
+
+    def set_option(self, name, opt_string, opt_value):
+        try:
+            d = self.dynamic_plugins.get(name, None)
+            if d:
+                d.set_option(opt_string, opt_value)
+        except:
+            pass
+
+    def is_running(self, name):
+        try:
+            d = self.dynamic_plugins.get(name, None)
+            if d:
+                return d.is_running()
+        except:
+            pass
+        return False
+
+    def is_enabled(self, name):
+        try:
+            d = self.dynamic_plugins.get(name, None)
+            if d:
+                return True
+        except:
+            pass
+        return False
+
     # }}}
 
 class DeviceAction(QAction): # {{{
@@ -708,6 +767,7 @@ class DeviceMixin(object): # {{{
                 self.job_manager, Dispatcher(self.status_bar.show_message),
                 Dispatcher(self.show_open_feedback))
         self.device_manager.start()
+        self.device_manager.devices_initialized.get()
         if tweaks['auto_connect_to_folder']:
             self.connect_to_folder_named(tweaks['auto_connect_to_folder'])
 

src/calibre/gui2/ui.py

@@ -337,6 +337,15 @@ class Main(MainWindow, MainWindowMixin, DeviceMixin, EmailMixin, # {{{
         if config['autolaunch_server']:
             self.start_content_server()
 
+        smartdevice_actions = self.iactions['Connect Share']
+        smartdevice_actions.check_smartdevice_menus()
+        if self.device_manager.get_option('smartdevice', 'autostart'):
+            try:
+                self.device_manager.start_plugin('smartdevice')
+                smartdevice_actions.smartdevice_state_changed(True)
+            except:
+                pass
+
         self.keyboard_interrupt.connect(self.quit, type=Qt.QueuedConnection)
 
         self.read_settings()

src/calibre/utils/Zeroconf.py

@@ -955,11 +955,16 @@ class Reaper(threading.Thread):
                 return
             if globals()['_GLOBAL_DONE']:
                 return
-            now = currentTimeMillis()
-            for record in self.zeroconf.cache.entries():
-                if record.isExpired(now):
-                    self.zeroconf.updateRecord(now, record)
-                    self.zeroconf.cache.remove(record)
+            try:
+                # can get here in a race condition with shutdown. Swallow the
+                # exception and run around the loop again.
+                now = currentTimeMillis()
+                for record in self.zeroconf.cache.entries():
+                    if record.isExpired(now):
+                        self.zeroconf.updateRecord(now, record)
+                        self.zeroconf.cache.remove(record)
+            except:
+                pass
 
 
 class ServiceBrowser(threading.Thread):