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

   1 # Copyright 2012-2013 GRNET S.A. All rights reserved.
   2 #
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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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  11 #   2. Redistributions in binary form must reproduce the above
  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
  18 # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19 # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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  29 # The views and conclusions contained in the software and
  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, stderr
  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, required, 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('silent', None)
 177         tmp_args.pop('config', None)
 178         help_parser = ArgumentParseManager(
 179             cmd_name, tmp_args, required,
 180             syntax=syntax, description=descr, check_required=False)
 181         return help_parser.print_help
 182
 183     def _register_command(self, cmd_path):
 184         cmd = self.cmd_tree.get_command(cmd_path)
 185         arguments = self._parser.arguments
 186
 187         def do_method(new_context, line):
 188             """ Template for all cmd.Cmd methods of the form do_<cmd name>
 189                 Parse cmd + args and decide to execute or change context
 190                 <cmd> <term> <term> <args> is always parsed to most specific
 191                 even if cmd_term_term is not a terminal path
 192             """
 193             subcmd, cmd_args = cmd.parse_out(split_input(line))
 194             self._history.add(' '.join([cmd.path.replace('_', ' '), line]))
 195             cmd_parser = ArgumentParseManager(
 196                 cmd.name, dict(self._parser.arguments))
 197             cmd_parser.parser.description = subcmd.help
 198
 199             # exec command or change context
 200             if subcmd.is_command:  # exec command
 201                 try:
 202                     cls = subcmd.cmd_class
 203                     cmd_parser.required = getattr(cls, 'required', None)
 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                     subpath = subcmd.path.split('_')[
 216                         (len(cmd.path.split('_')) - 1):]
 217                     cmd_parser.syntax = '%s %s' % (
 218                         ' '.join(subpath), instance.syntax)
 219                     help_method = self._create_help_method(
 220                         cmd.name, cmd_parser.arguments,
 221                         cmd_parser.required, subcmd.help, cmd_parser.syntax)
 222                     if '-h' in cmd_args or '--help' in cmd_args:
 223                         help_method()
 224                         if ldescr.strip():
 225                             print('\nDetails:')
 226                             print('%s' % ldescr)
 227                         return
 228                     cmd_parser.parse(cmd_args)
 229
 230                     for name, arg in instance.arguments.items():
 231                         arg.value = getattr(
 232                             cmd_parser.parsed, name, arg.default)
 233
 234                     exec_cmd(instance, cmd_parser.unparsed, help_method)
 235                         #[term for term in cmd_parser.unparsed\
 236                         #    if not term.startswith('-')],
 237                 except (ClientError, CLIError) as err:
 238                     print_error_message(err)
 239             elif ('-h' in cmd_args or '--help' in cmd_args) or len(cmd_args):
 240                 # print options
 241                 print('%s' % cmd.help)
 242                 print_subcommands_help(cmd)
 243             else:  # change context
 244                 #new_context = this
 245                 backup_context = self._backup()
 246                 old_prompt = self.prompt
 247                 new_context._roll_command(cmd.parent_path)
 248                 new_context.set_prompt(subcmd.path.replace('_', ' '))
 249                 newcmds = [subcmd for subcmd in subcmd.subcommands.values()]
 250                 for subcmd in newcmds:
 251                     new_context._register_command(subcmd.path)
 252                 new_context.cmdloop()
 253                 self.prompt = old_prompt
 254                 #when new context is over, roll back to the old one
 255                 self._restore(backup_context)
 256         self._register_method(do_method, 'do_%s' % cmd.name)
 257
 258         def help_method(self):
 259             print('%s (%s -h for more options)' % (cmd.help, cmd.name))
 260             if cmd.is_command:
 261                 cls = cmd.cmd_class
 262                 ldescr = getattr(cls, 'long_description', '')
 263                 #_construct_command_syntax(cls)
 264                 plist = self.prompt[len(self._prefix):-len(self._suffix)]
 265                 plist = plist.split(' ')
 266                 clist = cmd.path.split('_')
 267                 upto = 0
 268                 if ldescr:
 269                     print('%s' % ldescr)
 270                 for i, term in enumerate(plist):
 271                     try:
 272                         if clist[i] == term:
 273                             upto += 1
 274                     except IndexError:
 275                         break
 276                 print('Syntax: %s %s' % (' '.join(clist[upto:]), cls.syntax))
 277             if cmd.subcommands:
 278                 print_subcommands_help(cmd)
 279
 280         self._register_method(help_method, 'help_%s' % cmd.name)
 281
 282         def complete_method(self, text, line, begidx, endidx):
 283             subcmd, cmd_args = cmd.parse_out(split_input(line)[1:])
 284             if subcmd.is_command:
 285                 cls = subcmd.cmd_class
 286                 instance = cls(dict(arguments))
 287                 empty, sep, subname = subcmd.path.partition(cmd.path)
 288                 cmd_name = '%s %s' % (cmd.name, subname.replace('_', ' '))
 289                 print('\n%s\nSyntax:\t%s %s' % (
 290                     cls.help, cmd_name, cls.syntax))
 291                 cmd_args = {}
 292                 for arg in instance.arguments.values():
 293                     cmd_args[','.join(arg.parsed_name)] = arg.help
 294                 print_dict(cmd_args, indent=2)
 295                 stdout.write('%s %s' % (self.prompt, line))
 296             return subcmd.subnames()
 297         self._register_method(complete_method, 'complete_%s' % cmd.name)
 298
 299     @property
 300     def doc_header(self):
 301         tmp_partition = self.prompt.partition(self._prefix)
 302         tmp_partition = tmp_partition[2].partition(self._suffix)
 303         hdr = tmp_partition[0].strip()
 304         return '%s commands:' % hdr
 305
 306     def run(self, auth_base, cloud, parser, path=''):
 307         self.auth_base = auth_base
 308         self.cloud = cloud
 309         self._parser = parser
 310         cnf = parser.arguments['config']
 311         self._history = History(cnf.get('global', 'history_file'))
 312         self._history.limit = cnf.get('global', 'history_limit')
 313         if path:
 314             cmd = self.cmd_tree.get_command(path)
 315             intro = cmd.path.replace('_', ' ')
 316         else:
 317             intro = self.cmd_tree.name
 318
 319         acceptable = parser.arguments['config'].groups
 320         total = self.cmd_tree.groups.keys()
 321         self.cmd_tree.exclude(set(total).difference(acceptable))
 322
 323         for subcmd in self.cmd_tree.get_subcommands(path):
 324             self._register_command(subcmd.path)
 325
 326         self.set_prompt(intro)
 327
 328         try:
 329             self.cmdloop()
 330         except Exception as e:
 331             print('(%s)' % e)
 332             from traceback import print_stack
 333             print_stack()