gui.py

   1 import gtk, os, gobject
   2
   3 from policy import Policy
   4 import download
   5 import dialog
   6 from reader import InvalidInterface
   7 from model import SafeException
   8
   9 # Singleton Policy
  10 policy = None
  11
  12 class GUIPolicy(Policy):
  13         window = None
  14         n_downloads = 0
  15         pulse = None
  16
  17         def __init__(self, interface, prog_args):
  18                 Policy.__init__(self, interface)
  19                 global policy
  20                 assert policy is None
  21                 policy = self
  22
  23                 import mainwindow
  24                 self.window = mainwindow.MainWindow(prog_args)
  25                 self.window.browser.set_root(policy.get_interface(policy.root))
  26
  27         def monitor_download(self, dl):
  28                 error_stream = dl.start()
  29                 def error_ready(src, cond):
  30                         got = os.read(src.fileno(), 100)
  31                         if not got:
  32                                 error_stream.close()
  33                                 self.n_downloads -= 1
  34                                 if self.n_downloads == 0:
  35                                         self.window.progress.hide()
  36                                         gobject.source_remove(self.pulse)
  37                                         self.pulse = None
  38                                 try:
  39                                         data = dl.error_stream_closed()
  40                                         self.check_signed_data(dl, data)
  41                                 except download.DownloadError, ex:
  42                                         dialog.alert(self.window,
  43                                                 "Error downloading interface '%s':\n\n%s" %
  44                                                 (dl.interface.uri, ex))
  45                                 except InvalidInterface, ex:
  46                                         dialog.alert(self.window,
  47                                                 "Syntax error in downloaded interface '%s':\n\n%s" %
  48                                                 (dl.interface.uri, ex))
  49                                 except SafeException, ex:
  50                                         dialog.alert(self.window,
  51                                                 "Error updating interface '%s':\n\n%s" %
  52                                                 (dl.interface.uri, ex))
  53                                 return False
  54                         dl.error_stream_data(got)
  55                         return True
  56
  57                 gobject.io_add_watch(error_stream,
  58                                      gobject.IO_IN | gobject.IO_HUP,
  59                                      error_ready)
  60
  61                 self.n_downloads += 1
  62                 if self.pulse is None:
  63                         progress = self.window.progress
  64                         self.pulse = gobject.timeout_add(50, lambda: progress.pulse() or True)
  65                         progress.show()
  66
  67         def confirm_trust_keys(self, interface, sigs, iface_xml):
  68                 import trust_box
  69                 trust_box.trust_box.confirm_trust(interface, sigs, iface_xml)
  70
  71         def main(self):
  72                 self.window.show()
  73                 gtk.main()
  74
  75 def pretty_size(size):
  76         if size is None:
  77                 return '?'
  78         if size < 2048:
  79                 return '%d bytes' % size
  80         size = float(size)
  81         for unit in ('Kb', 'Mb', 'Gb', 'Tb'):
  82                 size /= 1024
  83                 if size < 2048:
  84                         break
  85         return '%.1f %s' % (size, unit)
  86