gsh/file_transfer.py

   1 # This program is free software; you can redistribute it and/or modify
   2 # it under the terms of the GNU General Public License as published by
   3 # the Free Software Foundation; either version 2 of the License, or
   4 # (at your option) any later version.
   5 #
   6 # This program is distributed in the hope that it will be useful,
   7 # but WITHOUT ANY WARRANTY; without even the implied warranty of
   8 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9 # GNU Library General Public License for more details.
  10 #
  11 # You should have received a copy of the GNU General Public License
  12 # along with this program; if not, write to the Free Software
  13 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  14 #
  15 # See the COPYING file for license information.
  16 #
  17 # Copyright (c) 2007, 2008 Guillaume Chazarain <guichaz@gmail.com>
  18
  19 import base64
  20 import random
  21
  22 from gsh import callbacks
  23 from gsh import pity
  24 from gsh.console import console_output
  25
  26 CMD_PREFIX = 'python -c "`echo "%s"|tr , \\\\\\n|openssl base64 -d`" '
  27
  28 CMD_SEND = CMD_PREFIX + 'send "%s" "%s" "%s"\n'
  29 CMD_FORWARD = CMD_PREFIX + 'forward "%s" "%s"\n'
  30 CMD_RECEIVE = CMD_PREFIX + 'receive "%s" "%s"\n'
  31
  32 def base64version(module):
  33     path = module.__file__
  34     if not path.endswith('.py'):
  35         # Read from the .py source file
  36         dot_py_start = path.find('.py')
  37         if dot_py_start >= 0:
  38             path = path[:dot_py_start+3]
  39     python_lines = []
  40     for line in file(path):
  41         hash_pos = line.find(chr(35))
  42         if hash_pos < 0:
  43             line = line[:hash_pos]
  44         line = line.rstrip()
  45         if line:
  46             python_lines.append(line)
  47     python_source = '\n'.join(python_lines)
  48     encoded = base64.encodestring(python_source).rstrip('\n').replace('\n', ',')
  49     return encoded
  50
  51 def file_transfer_cb(dispatcher, host_port):
  52     previous_shell = get_previous_shell(dispatcher)
  53     previous_shell.dispatch_write(host_port + '\n')
  54
  55 def get_infos():
  56     """Returns (first, last)"""
  57     from gsh import dispatchers
  58     first = None
  59     last = None
  60     for i in dispatchers.all_instances():
  61         if i.enabled:
  62             if not first:
  63                 first = i
  64             last = i
  65     return first, last
  66
  67 def get_previous_shell(shell):
  68     from gsh import dispatchers
  69     shells = [i for i in dispatchers.all_instances() if i.enabled]
  70     current_pos = shells.index(shell)
  71     while True:
  72         current_pos = (current_pos - 1) % len(shells)
  73         prev_shell = shells[current_pos]
  74         if prev_shell.enabled:
  75             return prev_shell
  76
  77 def replicate(shell, path):
  78     from gsh import dispatchers
  79     from gsh import remote_dispatcher
  80     nr_peers = len([i for i in dispatchers.all_instances() if i.enabled])
  81     if nr_peers <= 1:
  82         console_output('No other remote shell to replicate files to\n')
  83         return
  84     receiver = get_previous_shell(shell)
  85     pity_py = base64version(pity)
  86     for i in dispatchers.all_instances():
  87         if not i.enabled:
  88             continue
  89         cb = lambda host_port, i=i: file_transfer_cb(i, host_port)
  90         transfer1, transfer2 = callbacks.add('file transfer', cb, False)
  91         if i == shell:
  92             i.dispatch_command(CMD_SEND % (pity_py, path, transfer1, transfer2))
  93         elif i != receiver:
  94             i.dispatch_command(CMD_FORWARD % (pity_py, transfer1, transfer2))
  95         else:
  96             i.dispatch_command(CMD_RECEIVE % (pity_py, transfer1, transfer2))
  97         i.change_state(remote_dispatcher.STATE_RUNNING)
  98