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276 lines
8.2 KiB
276 lines
8.2 KiB
# encoding: utf-8
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"""
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A base Application class for Jupyter applications.
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All Jupyter applications should inherit from this.
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"""
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# Copyright (c) Jupyter Development Team.
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# Distributed under the terms of the Modified BSD License.
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from __future__ import print_function
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from copy import deepcopy
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import logging
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import os
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import sys
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try:
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# py3
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from shutil import which
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except ImportError:
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from .utils.shutil_which import which
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try:
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raw_input
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except NameError:
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# py3
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raw_input = input
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from traitlets.config.application import Application, catch_config_error
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from traitlets.config.loader import ConfigFileNotFound
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from traitlets import Unicode, Bool, List, observe
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from .utils import ensure_dir_exists
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from ipython_genutils import py3compat
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from .paths import (
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jupyter_config_dir, jupyter_data_dir, jupyter_runtime_dir,
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jupyter_path, jupyter_config_path, allow_insecure_writes,
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issue_insecure_write_warning
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)
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# aliases and flags
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base_aliases = {
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'log-level' : 'Application.log_level',
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'config' : 'JupyterApp.config_file',
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}
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base_flags = {
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'debug': ({'Application' : {'log_level' : logging.DEBUG}},
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"set log level to logging.DEBUG (maximize logging output)"),
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'generate-config': ({'JupyterApp': {'generate_config': True}},
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"generate default config file"),
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'y': ({'JupyterApp': {'answer_yes': True}},
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"Answer yes to any questions instead of prompting."),
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}
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class NoStart(Exception):
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"""Exception to raise when an application shouldn't start"""
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class JupyterApp(Application):
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"""Base class for Jupyter applications"""
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name = 'jupyter' # override in subclasses
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description = "A Jupyter Application"
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aliases = base_aliases
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flags = base_flags
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def _log_level_default(self):
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return logging.INFO
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jupyter_path = List(Unicode())
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def _jupyter_path_default(self):
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return jupyter_path()
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config_dir = Unicode()
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def _config_dir_default(self):
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return jupyter_config_dir()
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@property
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def config_file_paths(self):
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path = jupyter_config_path()
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if self.config_dir not in path:
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path.insert(0, self.config_dir)
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path.insert(0, py3compat.getcwd())
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return path
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data_dir = Unicode()
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def _data_dir_default(self):
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d = jupyter_data_dir()
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ensure_dir_exists(d, mode=0o700)
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return d
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runtime_dir = Unicode()
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def _runtime_dir_default(self):
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rd = jupyter_runtime_dir()
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ensure_dir_exists(rd, mode=0o700)
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return rd
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@observe('runtime_dir')
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def _runtime_dir_changed(self, change):
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ensure_dir_exists(change['new'], mode=0o700)
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generate_config = Bool(False, config=True,
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help="""Generate default config file."""
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)
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config_file_name = Unicode(config=True,
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help="Specify a config file to load."
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)
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def _config_file_name_default(self):
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if not self.name:
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return ''
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return self.name.replace('-','_') + u'_config'
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config_file = Unicode(config=True,
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help="""Full path of a config file.""",
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)
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answer_yes = Bool(False, config=True,
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help="""Answer yes to any prompts."""
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)
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def write_default_config(self):
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"""Write our default config to a .py config file"""
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if self.config_file:
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config_file = self.config_file
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else:
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config_file = os.path.join(self.config_dir, self.config_file_name + '.py')
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if os.path.exists(config_file) and not self.answer_yes:
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answer = ''
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def ask():
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prompt = "Overwrite %s with default config? [y/N]" % config_file
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try:
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return raw_input(prompt).lower() or 'n'
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except KeyboardInterrupt:
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print('') # empty line
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return 'n'
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answer = ask()
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while not answer.startswith(('y', 'n')):
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print("Please answer 'yes' or 'no'")
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answer = ask()
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if answer.startswith('n'):
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return
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config_text = self.generate_config_file()
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if isinstance(config_text, bytes):
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config_text = config_text.decode('utf8')
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print("Writing default config to: %s" % config_file)
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ensure_dir_exists(os.path.abspath(os.path.dirname(config_file)), 0o700)
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with open(config_file, mode='w') as f:
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f.write(config_text)
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def migrate_config(self):
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"""Migrate config/data from IPython 3"""
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if os.path.exists(os.path.join(self.config_dir, 'migrated')):
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# already migrated
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return
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from .migrate import get_ipython_dir, migrate
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# No IPython dir, nothing to migrate
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if not os.path.exists(get_ipython_dir()):
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return
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migrate()
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def load_config_file(self, suppress_errors=True):
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"""Load the config file.
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By default, errors in loading config are handled, and a warning
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printed on screen. For testing, the suppress_errors option is set
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to False, so errors will make tests fail.
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"""
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self.log.debug("Searching %s for config files", self.config_file_paths)
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base_config = 'jupyter_config'
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try:
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super(JupyterApp, self).load_config_file(
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base_config,
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path=self.config_file_paths,
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)
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except ConfigFileNotFound:
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# ignore errors loading parent
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self.log.debug("Config file %s not found", base_config)
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pass
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if self.config_file:
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path, config_file_name = os.path.split(self.config_file)
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else:
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path = self.config_file_paths
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config_file_name = self.config_file_name
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if not config_file_name or (config_file_name == base_config):
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return
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try:
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super(JupyterApp, self).load_config_file(
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config_file_name,
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path=path
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)
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except ConfigFileNotFound:
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self.log.debug("Config file not found, skipping: %s", config_file_name)
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except Exception:
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# Reraise errors for testing purposes, or if set in
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# self.raise_config_file_errors
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if (not suppress_errors) or self.raise_config_file_errors:
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raise
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self.log.warning("Error loading config file: %s" %
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config_file_name, exc_info=True)
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# subcommand-related
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def _find_subcommand(self, name):
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name = '{}-{}'.format(self.name, name)
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return which(name)
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@property
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def _dispatching(self):
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"""Return whether we are dispatching to another command
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or running ourselves.
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"""
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return bool(self.generate_config or self.subapp or self.subcommand)
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subcommand = Unicode()
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@catch_config_error
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def initialize(self, argv=None):
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# don't hook up crash handler before parsing command-line
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if argv is None:
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argv = sys.argv[1:]
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if argv:
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subc = self._find_subcommand(argv[0])
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if subc:
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self.argv = argv
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self.subcommand = subc
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return
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self.parse_command_line(argv)
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cl_config = deepcopy(self.config)
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if self._dispatching:
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return
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self.migrate_config()
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self.load_config_file()
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# enforce cl-opts override configfile opts:
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self.update_config(cl_config)
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if allow_insecure_writes:
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issue_insecure_write_warning()
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def start(self):
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"""Start the whole thing"""
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if self.subcommand:
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os.execv(self.subcommand, [self.subcommand] + self.argv[1:])
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raise NoStart()
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if self.subapp:
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self.subapp.start()
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raise NoStart()
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if self.generate_config:
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self.write_default_config()
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raise NoStart()
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@classmethod
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def launch_instance(cls, argv=None, **kwargs):
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"""Launch an instance of a Jupyter Application"""
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try:
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return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)
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except NoStart:
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return
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if __name__ == '__main__':
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JupyterApp.launch_instance()
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