code.grnet.gr Git - kamaki/blob - kamaki/cli/command_shell.py

   1 # Copyright 2012-2013 GRNET S.A. All rights reserved.
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   4 # without modification, are permitted provided that the following
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   6 #
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   8 #      copyright notice, this list of conditions and the following
   9 #      disclaimer.
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  12 #      copyright notice, this list of conditions and the following
  13 #      disclaimer in the documentation and/or other materials
  14 #      provided with the distribution.
  15 #
  16 # THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
  17 # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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  30 # documentation are those of the authors and should not be
  31 # interpreted as representing official policies, either expressed
  32 # or implied, of GRNET S.A.
  33
  34 from cmd import Cmd
  35 from os import popen
  36 from sys import stdout
  37
  38 from kamaki.cli import exec_cmd, print_error_message, print_subcommands_help
  39 from kamaki.cli.argument import ArgumentParseManager
  40 from kamaki.cli.utils import print_dict, split_input
  41 from kamaki.cli.history import History
  42 from kamaki.cli.errors import CLIError
  43 from kamaki.clients import ClientError
  44 from kamaki.cli.logger import add_file_logger
  45
  46 log = add_file_logger(__name__)
  47
  48
  49 def _init_shell(exe_string, parser, username='', userid=''):
  50     parser.arguments.pop('version', None)
  51     shell = Shell()
  52     shell.set_prompt(exe_string)
  53     from kamaki import __version__ as version
  54     shell.greet(version, username, userid)
  55     shell.do_EOF = shell.do_exit
  56     from kamaki.cli.command_tree import CommandTree
  57     shell.cmd_tree = CommandTree(
  58         'kamaki', 'A command line tool for poking clouds')
  59     return shell
  60
  61
  62 class Shell(Cmd):
  63     """Kamaki interactive shell"""
  64     _prefix = '['
  65     _suffix = ']: '
  66     cmd_tree = None
  67     _history = None
  68     _context_stack = []
  69     _prompt_stack = []
  70     _parser = None
  71     auth_base = None
  72     cloud = None
  73
  74     undoc_header = 'interactive shell commands:'
  75
  76     def emptyline(self):
  77         self.lastcmd = ''
  78
  79     def postcmd(self, post, line):
  80         if self._context_stack:
  81             self._roll_command()
  82             self._restore(self._context_stack.pop())
  83             self.set_prompt(
  84                 self._prompt_stack.pop()[len(self._prefix):-len(self._suffix)])
  85
  86         return Cmd.postcmd(self, post, line)
  87
  88     def precmd(self, line):
  89         if line.startswith('/'):
  90             start, end = len(self._prefix), -len(self._suffix)
  91             cur_cmd_path = self.prompt.replace(' ', '_')[start:end]
  92             if cur_cmd_path != self.cmd_tree.name:
  93                 cur_cmd = self.cmd_tree.get_command(cur_cmd_path)
  94                 self._context_stack.append(self._backup())
  95                 self._prompt_stack.append(self.prompt)
  96                 new_context = self
  97                 self._roll_command(cur_cmd.path)
  98                 new_context.set_prompt(self.cmd_tree.name)
  99                 for grp_cmd in self.cmd_tree.get_subcommands():
 100                     self._register_command(grp_cmd.path)
 101             return line[1:]
 102         return line
 103
 104     def greet(self, version, username='', userid=''):
 105         print('kamaki v%s - Interactive Shell\n' % version)
 106         print('\t/exit     \tterminate kamaki')
 107         print('\texit or ^D\texit context')
 108         print('\t? or help \tavailable commands')
 109         print('\t?command  \thelp on command')
 110         print('\t!<command>\texecute OS shell command')
 111         print('')
 112         if username or userid:
 113             print('Session user is %s (uuid: %s)' % (username, userid))
 114
 115     def set_prompt(self, new_prompt):
 116         self.prompt = '%s%s%s' % (self._prefix, new_prompt, self._suffix)
 117
 118     def cmdloop(self):
 119         while True:
 120             try:
 121                 Cmd.cmdloop(self)
 122             except KeyboardInterrupt:
 123                 print(' - interrupted')
 124                 continue
 125             break
 126
 127     def do_exit(self, line):
 128         print('')
 129         start, end = len(self._prefix), -len(self._suffix)
 130         if self.prompt[start:end] == self.cmd_tree.name:
 131             exit(0)
 132         return True
 133
 134     def do_shell(self, line):
 135         output = popen(line).read()
 136         print(output)
 137
 138     @property
 139     def path(self):
 140         if self._cmd:
 141             return self._cmd.path
 142         return ''
 143
 144     @classmethod
 145     def _register_method(self, method, name):
 146         self.__dict__[name] = method
 147
 148     @classmethod
 149     def _unregister_method(self, name):
 150         try:
 151             self.__dict__.pop(name)
 152         except KeyError:
 153             pass
 154
 155     def _roll_command(self, cmd_path=None):
 156         for subname in self.cmd_tree.subnames(cmd_path):
 157             self._unregister_method('do_%s' % subname)
 158             self._unregister_method('complete_%s' % subname)
 159             self._unregister_method('help_%s' % subname)
 160
 161     @classmethod
 162     def _backup(self):
 163         return dict(self.__dict__)
 164
 165     @classmethod
 166     def _restore(self, oldcontext):
 167         self.__dict__ = oldcontext
 168
 169     @staticmethod
 170     def _create_help_method(cmd_name, args, descr, syntax):
 171         tmp_args = dict(args)
 172         tmp_args.pop('options', None)
 173         tmp_args.pop('cloud', None)
 174         tmp_args.pop('debug', None)
 175         tmp_args.pop('verbose', None)
 176         tmp_args.pop('include', None)
 177         tmp_args.pop('silent', None)
 178         tmp_args.pop('config', None)
 179         help_parser = ArgumentParseManager(cmd_name, tmp_args)
 180         help_parser.parser.description = descr
 181         help_parser.syntax = syntax
 182         return help_parser.parser.print_help
 183
 184     def _register_command(self, cmd_path):
 185         cmd = self.cmd_tree.get_command(cmd_path)
 186         arguments = self._parser.arguments
 187
 188         def do_method(new_context, line):
 189             """ Template for all cmd.Cmd methods of the form do_<cmd name>
 190                 Parse cmd + args and decide to execute or change context
 191                 <cmd> <term> <term> <args> is always parsed to most specific
 192                 even if cmd_term_term is not a terminal path
 193             """
 194             subcmd, cmd_args = cmd.parse_out(split_input(line))
 195             self._history.add(' '.join([cmd.path.replace('_', ' '), line]))
 196             cmd_parser = ArgumentParseManager(
 197                 cmd.name, dict(self._parser.arguments))
 198             cmd_parser.parser.description = subcmd.help
 199
 200             # exec command or change context
 201             if subcmd.is_command:  # exec command
 202                 try:
 203                     cls = subcmd.cmd_class
 204                     ldescr = getattr(cls, 'long_description', '')
 205                     if subcmd.path == 'history_run':
 206                         instance = cls(
 207                             dict(cmd_parser.arguments), self.auth_base,
 208                             cmd_tree=self.cmd_tree)
 209                     else:
 210                         instance = cls(
 211                             dict(cmd_parser.arguments),
 212                             self.auth_base, self.cloud)
 213                     cmd_parser.update_arguments(instance.arguments)
 214                     cmd_parser.arguments = instance.arguments
 215                     cmd_parser.syntax = '%s %s' % (
 216                         subcmd.path.replace('_', ' '), cls.syntax)
 217                     help_method = self._create_help_method(
 218                         cmd.name, cmd_parser.arguments,
 219                         subcmd.help, cmd_parser.syntax)
 220                     if '-h' in cmd_args or '--help' in cmd_args:
 221                         help_method()
 222                         if ldescr.strip():
 223                             print('\nDetails:')
 224                             print('%s' % ldescr)
 225                         return
 226                     cmd_parser.parse(cmd_args)
 227
 228                     for name, arg in instance.arguments.items():
 229                         arg.value = getattr(
 230                             cmd_parser.parsed, name, arg.default)
 231
 232                     exec_cmd(instance, cmd_parser.unparsed, help_method)
 233                         #[term for term in cmd_parser.unparsed\
 234                         #    if not term.startswith('-')],
 235                 except (ClientError, CLIError) as err:
 236                     print_error_message(err)
 237             elif ('-h' in cmd_args or '--help' in cmd_args) or len(cmd_args):
 238                 # print options
 239                 print('%s' % cmd.help)
 240                 print_subcommands_help(cmd)
 241             else:  # change context
 242                 #new_context = this
 243                 backup_context = self._backup()
 244                 old_prompt = self.prompt
 245                 new_context._roll_command(cmd.parent_path)
 246                 new_context.set_prompt(subcmd.path.replace('_', ' '))
 247                 newcmds = [subcmd for subcmd in subcmd.subcommands.values()]
 248                 for subcmd in newcmds:
 249                     new_context._register_command(subcmd.path)
 250                 new_context.cmdloop()
 251                 self.prompt = old_prompt
 252                 #when new context is over, roll back to the old one
 253                 self._restore(backup_context)
 254         self._register_method(do_method, 'do_%s' % cmd.name)
 255
 256         def help_method(self):
 257             print('%s (%s -h for more options)' % (cmd.help, cmd.name))
 258             if cmd.is_command:
 259                 cls = cmd.cmd_class
 260                 ldescr = getattr(cls, 'long_description', '')
 261                 #_construct_command_syntax(cls)
 262                 plist = self.prompt[len(self._prefix):-len(self._suffix)]
 263                 plist = plist.split(' ')
 264                 clist = cmd.path.split('_')
 265                 upto = 0
 266                 if ldescr:
 267                     print('%s' % ldescr)
 268                 for i, term in enumerate(plist):
 269                     try:
 270                         if clist[i] == term:
 271                             upto += 1
 272                     except IndexError:
 273                         break
 274                 print('Syntax: %s %s' % (' '.join(clist[upto:]), cls.syntax))
 275             if cmd.subcommands:
 276                 print_subcommands_help(cmd)
 277
 278         self._register_method(help_method, 'help_%s' % cmd.name)
 279
 280         def complete_method(self, text, line, begidx, endidx):
 281             subcmd, cmd_args = cmd.parse_out(split_input(line)[1:])
 282             if subcmd.is_command:
 283                 cls = subcmd.cmd_class
 284                 instance = cls(dict(arguments))
 285                 empty, sep, subname = subcmd.path.partition(cmd.path)
 286                 cmd_name = '%s %s' % (cmd.name, subname.replace('_', ' '))
 287                 print('\n%s\nSyntax:\t%s %s' % (
 288                     cls.help, cmd_name, cls.syntax))
 289                 cmd_args = {}
 290                 for arg in instance.arguments.values():
 291                     cmd_args[','.join(arg.parsed_name)] = arg.help
 292                 print_dict(cmd_args, indent=2)
 293                 stdout.write('%s %s' % (self.prompt, line))
 294             return subcmd.subnames()
 295         self._register_method(complete_method, 'complete_%s' % cmd.name)
 296
 297     @property
 298     def doc_header(self):
 299         tmp_partition = self.prompt.partition(self._prefix)
 300         tmp_partition = tmp_partition[2].partition(self._suffix)
 301         hdr = tmp_partition[0].strip()
 302         return '%s commands:' % hdr
 303
 304     def run(self, auth_base, cloud, parser, path=''):
 305         self.auth_base = auth_base
 306         self.cloud = cloud
 307         self._parser = parser
 308         self._history = History(
 309             parser.arguments['config'].get_global('history_file'))
 310         if path:
 311             cmd = self.cmd_tree.get_command(path)
 312             intro = cmd.path.replace('_', ' ')
 313         else:
 314             intro = self.cmd_tree.name
 315
 316         acceptable = parser.arguments['config'].groups
 317         total = self.cmd_tree.groups.keys()
 318         self.cmd_tree.exclude(set(total).difference(acceptable))
 319
 320         for subcmd in self.cmd_tree.get_subcommands(path):
 321             self._register_command(subcmd.path)
 322
 323         self.set_prompt(intro)
 324
 325         try:
 326             self.cmdloop()
 327         except Exception as e:
 328             print('(%s)' % e)
 329             from traceback import print_stack
 330             print_stack()