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[Bug 1422683] [NEW] The FTW fails when network is disconnected during download

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Public bug reported:

The FTW fails in 2 cases:
1. When network is disconnected while downloading data (song db, bibles, etc.) a traceback is not caught.
2. When network is disconnected while starting/doing threaded download of theme screenshot.

Traceback when disconnecting while downloading song database:
Traceback (most recent call last):
  File "/home/tgc/OpenLP/trunk/openlp/core/ui/firsttimeform.py", line 346, in on_current_id_changed
    self._perform_wizard()
  File "/home/tgc/OpenLP/trunk/openlp/core/ui/firsttimeform.py", line 599, in _perform_wizard
    if not self._download_selected():
  File "/home/tgc/OpenLP/trunk/openlp/core/ui/firsttimeform.py", line 628, in _download_selected
    if not self.url_get_file('%s%s' % (self.songs_url, filename), destination, sha256):
  File "/home/tgc/OpenLP/trunk/openlp/core/ui/firsttimeform.py", line 412, in url_get_file
    data = url_file.read(block_size)
  File "/usr/lib/python3.4/http/client.py", line 500, in read
    return super(HTTPResponse, self).read(amt)
  File "/usr/lib/python3.4/http/client.py", line 539, in readinto
    n = self.fp.readinto(b)
  File "/usr/lib/python3.4/socket.py", line 371, in readinto
    return self._sock.recv_into(b)
socket.timeout: timed out


Extract from the log when openlp hangs network is disconnected while starting/doing threaded download of theme screenshot 
2015-02-17 10:29:00,951 openlp.core.common.__init__                             DEBUG    check_directory_exists /tmp/openlp
2015-02-17 10:29:02,826 openlp.core.OpenLP                                      DEBUG    Entering process_events
2015-02-17 10:29:02,830 openlp.core.OpenLP                                      DEBUG    Entering process_events
2015-02-17 10:29:02,831 openlp.core.OpenLP                                      DEBUG    Entering process_events
2015-02-17 10:29:02,851 openlp.core.OpenLP                                      DEBUG    Entering process_events
2015-02-17 10:29:02,864 openlp.core.OpenLP                                      DEBUG    Entering set_busy_cursor
2015-02-17 10:29:02,868 openlp.core.OpenLP                                      DEBUG    Entering process_events
2015-02-17 10:29:02,871 openlp.core.utils.__init__                              DEBUG    Downloading URL = http://openlp.org/files/frw/download.cfg
2015-02-17 10:29:03,043 openlp.core.utils.__init__                              DEBUG    Downloaded URL = http://openlp.org/files/frw/download.cfg
2015-02-17 10:29:03,043 openlp.core.utils.__init__                              DEBUG    <http.client.HTTPResponse object at 0x7fc6f3319400>
2015-02-17 10:29:03,056 openlp.core.OpenLP                                      DEBUG    Entering process_events
2015-02-17 10:29:03,060 openlp.core.lib.pluginmanager.PluginManager             DEBUG    Entering get_plugin_by_name
2015-02-17 10:29:03,061 openlp.core.lib.pluginmanager.PluginManager             DEBUG    Entering get_plugin_by_name
2015-02-17 10:29:03,061 openlp.core.lib.pluginmanager.PluginManager             DEBUG    Entering get_plugin_by_name
2015-02-17 10:29:03,061 openlp.core.lib.pluginmanager.PluginManager             DEBUG    Entering get_plugin_by_name
2015-02-17 10:29:03,062 openlp.core.lib.pluginmanager.PluginManager             DEBUG    Entering get_plugin_by_name
2015-02-17 10:29:03,062 openlp.core.lib.pluginmanager.PluginManager             DEBUG    Entering get_plugin_by_name
2015-02-17 10:29:03,062 openlp.core.lib.pluginmanager.PluginManager             DEBUG    Entering get_plugin_by_name
2015-02-17 10:29:03,062 openlp.core.lib.pluginmanager.PluginManager             DEBUG    Entering get_plugin_by_name
2015-02-17 10:29:03,063 openlp.core.lib.pluginmanager.PluginManager             DEBUG    Entering get_plugin_by_name
2015-02-17 10:29:03,063 openlp.core.OpenLP                                      DEBUG    Entering set_normal_cursor
2015-02-17 10:29:03,064 openlp.core.OpenLP                                      DEBUG    Entering process_events
2015-02-17 10:29:03,065 openlp.core.OpenLP                                      DEBUG    Entering process_events
2015-02-17 10:29:03,066 openlp.core.OpenLP                                      DEBUG    Entering process_events
2015-02-17 10:29:03,066 openlp.core.OpenLP                                      DEBUG    Entering process_events
2015-02-17 10:29:03,067 openlp.core.OpenLP                                      DEBUG    Entering process_events
2015-02-17 10:29:03,068 openlp.core.OpenLP                                      DEBUG    Entering process_events
2015-02-17 10:29:03,069 openlp.core.OpenLP                                      DEBUG    Entering process_events

** Affects: openlp
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1422683

Title:
  The FTW fails when network is disconnected during download

Status in OpenLP - Worship Presentation Software:
  New

Bug description:
  The FTW fails in 2 cases:
  1. When network is disconnected while downloading data (song db, bibles, etc.) a traceback is not caught.
  2. When network is disconnected while starting/doing threaded download of theme screenshot.

  Traceback when disconnecting while downloading song database:
  Traceback (most recent call last):
    File "/home/tgc/OpenLP/trunk/openlp/core/ui/firsttimeform.py", line 346, in on_current_id_changed
      self._perform_wizard()
    File "/home/tgc/OpenLP/trunk/openlp/core/ui/firsttimeform.py", line 599, in _perform_wizard
      if not self._download_selected():
    File "/home/tgc/OpenLP/trunk/openlp/core/ui/firsttimeform.py", line 628, in _download_selected
      if not self.url_get_file('%s%s' % (self.songs_url, filename), destination, sha256):
    File "/home/tgc/OpenLP/trunk/openlp/core/ui/firsttimeform.py", line 412, in url_get_file
      data = url_file.read(block_size)
    File "/usr/lib/python3.4/http/client.py", line 500, in read
      return super(HTTPResponse, self).read(amt)
    File "/usr/lib/python3.4/http/client.py", line 539, in readinto
      n = self.fp.readinto(b)
    File "/usr/lib/python3.4/socket.py", line 371, in readinto
      return self._sock.recv_into(b)
  socket.timeout: timed out

  
  Extract from the log when openlp hangs network is disconnected while starting/doing threaded download of theme screenshot 
  2015-02-17 10:29:00,951 openlp.core.common.__init__                             DEBUG    check_directory_exists /tmp/openlp
  2015-02-17 10:29:02,826 openlp.core.OpenLP                                      DEBUG    Entering process_events
  2015-02-17 10:29:02,830 openlp.core.OpenLP                                      DEBUG    Entering process_events
  2015-02-17 10:29:02,831 openlp.core.OpenLP                                      DEBUG    Entering process_events
  2015-02-17 10:29:02,851 openlp.core.OpenLP                                      DEBUG    Entering process_events
  2015-02-17 10:29:02,864 openlp.core.OpenLP                                      DEBUG    Entering set_busy_cursor
  2015-02-17 10:29:02,868 openlp.core.OpenLP                                      DEBUG    Entering process_events
  2015-02-17 10:29:02,871 openlp.core.utils.__init__                              DEBUG    Downloading URL = http://openlp.org/files/frw/download.cfg
  2015-02-17 10:29:03,043 openlp.core.utils.__init__                              DEBUG    Downloaded URL = http://openlp.org/files/frw/download.cfg
  2015-02-17 10:29:03,043 openlp.core.utils.__init__                              DEBUG    <http.client.HTTPResponse object at 0x7fc6f3319400>
  2015-02-17 10:29:03,056 openlp.core.OpenLP                                      DEBUG    Entering process_events
  2015-02-17 10:29:03,060 openlp.core.lib.pluginmanager.PluginManager             DEBUG    Entering get_plugin_by_name
  2015-02-17 10:29:03,061 openlp.core.lib.pluginmanager.PluginManager             DEBUG    Entering get_plugin_by_name
  2015-02-17 10:29:03,061 openlp.core.lib.pluginmanager.PluginManager             DEBUG    Entering get_plugin_by_name
  2015-02-17 10:29:03,061 openlp.core.lib.pluginmanager.PluginManager             DEBUG    Entering get_plugin_by_name
  2015-02-17 10:29:03,062 openlp.core.lib.pluginmanager.PluginManager             DEBUG    Entering get_plugin_by_name
  2015-02-17 10:29:03,062 openlp.core.lib.pluginmanager.PluginManager             DEBUG    Entering get_plugin_by_name
  2015-02-17 10:29:03,062 openlp.core.lib.pluginmanager.PluginManager             DEBUG    Entering get_plugin_by_name
  2015-02-17 10:29:03,062 openlp.core.lib.pluginmanager.PluginManager             DEBUG    Entering get_plugin_by_name
  2015-02-17 10:29:03,063 openlp.core.lib.pluginmanager.PluginManager             DEBUG    Entering get_plugin_by_name
  2015-02-17 10:29:03,063 openlp.core.OpenLP                                      DEBUG    Entering set_normal_cursor
  2015-02-17 10:29:03,064 openlp.core.OpenLP                                      DEBUG    Entering process_events
  2015-02-17 10:29:03,065 openlp.core.OpenLP                                      DEBUG    Entering process_events
  2015-02-17 10:29:03,066 openlp.core.OpenLP                                      DEBUG    Entering process_events
  2015-02-17 10:29:03,066 openlp.core.OpenLP                                      DEBUG    Entering process_events
  2015-02-17 10:29:03,067 openlp.core.OpenLP                                      DEBUG    Entering process_events
  2015-02-17 10:29:03,068 openlp.core.OpenLP                                      DEBUG    Entering process_events
  2015-02-17 10:29:03,069 openlp.core.OpenLP                                      DEBUG    Entering process_events

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