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"""A notebook manager that uses the local file system for storage.
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Authors:
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* Brian Granger
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* Zach Sailer
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2011 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import io
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import itertools
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import os
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import glob
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import shutil
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from tornado import web
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from .nbmanager import NotebookManager
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from IPython.nbformat import current
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from IPython.utils.traitlets import Unicode, Dict, Bool, TraitError
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from IPython.utils import tz
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#-----------------------------------------------------------------------------
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# Classes
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#-----------------------------------------------------------------------------
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class FileNotebookManager(NotebookManager):
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save_script = Bool(False, config=True,
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help="""Automatically create a Python script when saving the notebook.
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For easier use of import, %run and %load across notebooks, a
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<notebook-name>.py script will be created next to any
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<notebook-name>.ipynb on each save. This can also be set with the
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short `--script` flag.
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"""
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)
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checkpoint_dir = Unicode(config=True,
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help="""The location in which to keep notebook checkpoints
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By default, it is notebook-dir/.ipynb_checkpoints
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"""
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)
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def _checkpoint_dir_default(self):
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return os.path.join(self.notebook_dir, '.ipynb_checkpoints')
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def _checkpoint_dir_changed(self, name, old, new):
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"""do a bit of validation of the checkpoint dir"""
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if not os.path.isabs(new):
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# If we receive a non-absolute path, make it absolute.
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abs_new = os.path.abspath(new)
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self.checkpoint_dir = abs_new
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return
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if os.path.exists(new) and not os.path.isdir(new):
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raise TraitError("checkpoint dir %r is not a directory" % new)
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if not os.path.exists(new):
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self.log.info("Creating checkpoint dir %s", new)
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try:
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os.mkdir(new)
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except:
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raise TraitError("Couldn't create checkpoint dir %r" % new)
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def get_notebook_names(self, path=''):
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"""List all notebook names in the notebook dir and path."""
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path = path.strip('/')
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if not os.path.isdir(self.get_os_path(path=path)):
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raise web.HTTPError(404, 'Directory not found: ' + path)
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names = glob.glob(self.get_os_path('*'+self.filename_ext, path))
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names = [os.path.basename(name)
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for name in names]
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return names
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def increment_filename(self, basename, path='', ext='.ipynb'):
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"""Return a non-used filename of the form basename<int>."""
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path = path.strip('/')
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for i in itertools.count():
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name = u'{basename}{i}{ext}'.format(basename=basename, i=i, ext=ext)
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os_path = self.get_os_path(name, path)
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if not os.path.isfile(os_path):
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break
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return name
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def path_exists(self, path):
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"""Does the API-style path (directory) actually exist?
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Parameters
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----------
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path : string
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The path to check. This is an API path (`/` separated,
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relative to base notebook-dir).
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Returns
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-------
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exists : bool
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Whether the path is indeed a directory.
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"""
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path = path.strip('/')
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os_path = self.get_os_path(path=path)
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return os.path.isdir(os_path)
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def get_os_path(self, name=None, path=''):
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"""Given a notebook name and a URL path, return its file system
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path.
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Parameters
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----------
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name : string
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The name of a notebook file with the .ipynb extension
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path : string
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The relative URL path (with '/' as separator) to the named
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notebook.
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Returns
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-------
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path : string
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A file system path that combines notebook_dir (location where
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server started), the relative path, and the filename with the
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current operating system's url.
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"""
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parts = path.strip('/').split('/')
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parts = [p for p in parts if p != ''] # remove duplicate splits
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if name is not None:
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parts.append(name)
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path = os.path.join(self.notebook_dir, *parts)
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return path
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def notebook_exists(self, name, path=''):
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"""Returns a True if the notebook exists. Else, returns False.
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Parameters
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----------
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name : string
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The name of the notebook you are checking.
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path : string
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The relative path to the notebook (with '/' as separator)
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Returns
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-------
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bool
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"""
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path = path.strip('/')
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nbpath = self.get_os_path(name, path=path)
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return os.path.isfile(nbpath)
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def list_notebooks(self, path):
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"""Returns a list of dictionaries that are the standard model
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for all notebooks in the relative 'path'.
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Parameters
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----------
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path : str
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the URL path that describes the relative path for the
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listed notebooks
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Returns
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-------
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notebooks : list of dicts
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a list of the notebook models without 'content'
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"""
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path = path.strip('/')
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notebook_names = self.get_notebook_names(path)
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notebooks = []
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for name in notebook_names:
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model = self.get_notebook_model(name, path, content=False)
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notebooks.append(model)
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notebooks = sorted(notebooks, key=lambda item: item['name'])
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return notebooks
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def get_notebook_model(self, name, path='', content=True):
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""" Takes a path and name for a notebook and returns its model
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Parameters
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----------
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name : str
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the name of the notebook
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path : str
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the URL path that describes the relative path for
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the notebook
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Returns
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-------
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model : dict
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the notebook model. If contents=True, returns the 'contents'
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dict in the model as well.
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"""
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path = path.strip('/')
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if not self.notebook_exists(name=name, path=path):
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raise web.HTTPError(404, u'Notebook does not exist: %s' % name)
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os_path = self.get_os_path(name, path)
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info = os.stat(os_path)
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last_modified = tz.utcfromtimestamp(info.st_mtime)
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created = tz.utcfromtimestamp(info.st_ctime)
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# Create the notebook model.
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model ={}
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model['name'] = name
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model['path'] = path
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model['last_modified'] = last_modified
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model['created'] = created
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if content is True:
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with io.open(os_path, 'r', encoding='utf-8') as f:
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try:
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nb = current.read(f, u'json')
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except Exception as e:
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raise web.HTTPError(400, u"Unreadable Notebook: %s %s" % (os_path, e))
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model['content'] = nb
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return model
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def save_notebook_model(self, model, name='', path=''):
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"""Save the notebook model and return the model with no content."""
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path = path.strip('/')
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if 'content' not in model:
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raise web.HTTPError(400, u'No notebook JSON data provided')
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# One checkpoint should always exist
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if self.notebook_exists(name, path) and not self.list_checkpoints(name, path):
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self.create_checkpoint(name, path)
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new_path = model.get('path', path).strip('/')
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new_name = model.get('name', name)
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if path != new_path or name != new_name:
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self.rename_notebook(name, path, new_name, new_path)
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# Save the notebook file
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os_path = self.get_os_path(new_name, new_path)
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nb = current.to_notebook_json(model['content'])
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if 'name' in nb['metadata']:
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nb['metadata']['name'] = u''
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try:
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self.log.debug("Autosaving notebook %s", os_path)
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with io.open(os_path, 'w', encoding='utf-8') as f:
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current.write(nb, f, u'json')
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except Exception as e:
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raise web.HTTPError(400, u'Unexpected error while autosaving notebook: %s %s' % (os_path, e))
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# Save .py script as well
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if self.save_script:
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py_path = os.path.splitext(os_path)[0] + '.py'
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self.log.debug("Writing script %s", py_path)
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try:
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with io.open(py_path, 'w', encoding='utf-8') as f:
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current.write(nb, f, u'py')
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except Exception as e:
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raise web.HTTPError(400, u'Unexpected error while saving notebook as script: %s %s' % (py_path, e))
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model = self.get_notebook_model(new_name, new_path, content=False)
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return model
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def update_notebook_model(self, model, name, path=''):
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"""Update the notebook's path and/or name"""
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path = path.strip('/')
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new_name = model.get('name', name)
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new_path = model.get('path', path).strip('/')
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if path != new_path or name != new_name:
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self.rename_notebook(name, path, new_name, new_path)
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model = self.get_notebook_model(new_name, new_path, content=False)
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return model
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def delete_notebook_model(self, name, path=''):
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"""Delete notebook by name and path."""
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path = path.strip('/')
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os_path = self.get_os_path(name, path)
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if not os.path.isfile(os_path):
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raise web.HTTPError(404, u'Notebook does not exist: %s' % os_path)
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# clear checkpoints
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for checkpoint in self.list_checkpoints(name, path):
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checkpoint_id = checkpoint['id']
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cp_path = self.get_checkpoint_path(checkpoint_id, name, path)
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if os.path.isfile(cp_path):
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self.log.debug("Unlinking checkpoint %s", cp_path)
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os.unlink(cp_path)
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self.log.debug("Unlinking notebook %s", os_path)
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os.unlink(os_path)
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def rename_notebook(self, old_name, old_path, new_name, new_path):
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"""Rename a notebook."""
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old_path = old_path.strip('/')
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new_path = new_path.strip('/')
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if new_name == old_name and new_path == old_path:
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return
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new_os_path = self.get_os_path(new_name, new_path)
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old_os_path = self.get_os_path(old_name, old_path)
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# Should we proceed with the move?
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if os.path.isfile(new_os_path):
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raise web.HTTPError(409, u'Notebook with name already exists: %s' % new_os_path)
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if self.save_script:
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old_py_path = os.path.splitext(old_os_path)[0] + '.py'
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new_py_path = os.path.splitext(new_os_path)[0] + '.py'
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if os.path.isfile(new_py_path):
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raise web.HTTPError(409, u'Python script with name already exists: %s' % new_py_path)
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# Move the notebook file
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try:
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os.rename(old_os_path, new_os_path)
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except Exception as e:
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raise web.HTTPError(500, u'Unknown error renaming notebook: %s %s' % (old_os_path, e))
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# Move the checkpoints
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old_checkpoints = self.list_checkpoints(old_name, old_path)
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for cp in old_checkpoints:
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checkpoint_id = cp['id']
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old_cp_path = self.get_checkpoint_path(checkpoint_id, old_name, old_path)
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new_cp_path = self.get_checkpoint_path(checkpoint_id, new_name, new_path)
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if os.path.isfile(old_cp_path):
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self.log.debug("Renaming checkpoint %s -> %s", old_cp_path, new_cp_path)
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os.rename(old_cp_path, new_cp_path)
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# Move the .py script
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if self.save_script:
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os.rename(old_py_path, new_py_path)
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# Checkpoint-related utilities
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def get_checkpoint_path(self, checkpoint_id, name, path=''):
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"""find the path to a checkpoint"""
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path = path.strip('/')
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basename, _ = os.path.splitext(name)
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filename = u"{name}-{checkpoint_id}{ext}".format(
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name=basename,
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checkpoint_id=checkpoint_id,
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ext=self.filename_ext,
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)
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cp_path = os.path.join(path, self.checkpoint_dir, filename)
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return cp_path
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def get_checkpoint_model(self, checkpoint_id, name, path=''):
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"""construct the info dict for a given checkpoint"""
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path = path.strip('/')
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cp_path = self.get_checkpoint_path(checkpoint_id, name, path)
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stats = os.stat(cp_path)
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last_modified = tz.utcfromtimestamp(stats.st_mtime)
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info = dict(
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id = checkpoint_id,
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last_modified = last_modified,
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)
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return info
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# public checkpoint API
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def create_checkpoint(self, name, path=''):
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"""Create a checkpoint from the current state of a notebook"""
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path = path.strip('/')
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nb_path = self.get_os_path(name, path)
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# only the one checkpoint ID:
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checkpoint_id = u"checkpoint"
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cp_path = self.get_checkpoint_path(checkpoint_id, name, path)
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self.log.debug("creating checkpoint for notebook %s", name)
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if not os.path.exists(self.checkpoint_dir):
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os.mkdir(self.checkpoint_dir)
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shutil.copy2(nb_path, cp_path)
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# return the checkpoint info
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return self.get_checkpoint_model(checkpoint_id, name, path)
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def list_checkpoints(self, name, path=''):
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"""list the checkpoints for a given notebook
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This notebook manager currently only supports one checkpoint per notebook.
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"""
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path = path.strip('/')
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checkpoint_id = "checkpoint"
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path = self.get_checkpoint_path(checkpoint_id, name, path)
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if not os.path.exists(path):
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return []
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else:
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return [self.get_checkpoint_model(checkpoint_id, name, path)]
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def restore_checkpoint(self, checkpoint_id, name, path=''):
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"""restore a notebook to a checkpointed state"""
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path = path.strip('/')
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self.log.info("restoring Notebook %s from checkpoint %s", name, checkpoint_id)
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nb_path = self.get_os_path(name, path)
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cp_path = self.get_checkpoint_path(checkpoint_id, name, path)
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if not os.path.isfile(cp_path):
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self.log.debug("checkpoint file does not exist: %s", cp_path)
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raise web.HTTPError(404,
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u'Notebook checkpoint does not exist: %s-%s' % (name, checkpoint_id)
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)
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# ensure notebook is readable (never restore from an unreadable notebook)
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with io.open(cp_path, 'r', encoding='utf-8') as f:
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nb = current.read(f, u'json')
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shutil.copy2(cp_path, nb_path)
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self.log.debug("copying %s -> %s", cp_path, nb_path)
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def delete_checkpoint(self, checkpoint_id, name, path=''):
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"""delete a notebook's checkpoint"""
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path = path.strip('/')
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cp_path = self.get_checkpoint_path(checkpoint_id, name, path)
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if not os.path.isfile(cp_path):
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raise web.HTTPError(404,
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u'Notebook checkpoint does not exist: %s%s-%s' % (path, name, checkpoint_id)
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)
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self.log.debug("unlinking %s", cp_path)
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os.unlink(cp_path)
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def info_string(self):
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return "Serving notebooks from local directory: %s" % self.notebook_dir
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