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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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"""
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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 datetime
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import io
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import os
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import glob
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import shutil
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from unicodedata import normalize
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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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filename_ext = Unicode(u'.ipynb')
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# Map notebook names to notebook_ids
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rev_mapping = Dict()
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def get_notebook_names(self):
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"""List all notebook names in the notebook dir."""
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names = glob.glob(os.path.join(self.notebook_dir,
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'*' + self.filename_ext))
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names = [normalize('NFC', os.path.splitext(os.path.basename(name))[0])
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for name in names]
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return names
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def list_notebooks(self):
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"""List all notebooks in the notebook dir."""
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names = self.get_notebook_names()
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data = []
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for name in names:
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if name not in self.rev_mapping:
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notebook_id = self.new_notebook_id(name)
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else:
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notebook_id = self.rev_mapping[name]
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data.append(dict(notebook_id=notebook_id,name=name))
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data = sorted(data, key=lambda item: item['name'])
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return data
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def new_notebook_id(self, name):
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"""Generate a new notebook_id for a name and store its mappings."""
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notebook_id = super(FileNotebookManager, self).new_notebook_id(name)
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self.rev_mapping[name] = notebook_id
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return notebook_id
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def delete_notebook_id(self, notebook_id):
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"""Delete a notebook's id in the mapping."""
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name = self.mapping[notebook_id]
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super(FileNotebookManager, self).delete_notebook_id(notebook_id)
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del self.rev_mapping[name]
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def notebook_exists(self, notebook_id):
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"""Does a notebook exist?"""
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exists = super(FileNotebookManager, self).notebook_exists(notebook_id)
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if not exists:
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return False
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path = self.get_path_by_name(self.mapping[notebook_id])
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return os.path.isfile(path)
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def get_name(self, notebook_id):
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"""get a notebook name, raising 404 if not found"""
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try:
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name = self.mapping[notebook_id]
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except KeyError:
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raise web.HTTPError(404, u'Notebook does not exist: %s' % notebook_id)
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return name
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def get_path(self, notebook_id):
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"""Return a full path to a notebook given its notebook_id."""
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name = self.get_name(notebook_id)
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return self.get_path_by_name(name)
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def get_path_by_name(self, name):
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"""Return a full path to a notebook given its name."""
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filename = name + self.filename_ext
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path = os.path.join(self.notebook_dir, filename)
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return path
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def read_notebook_object_from_path(self, path):
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"""read a notebook object from a path"""
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info = os.stat(path)
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last_modified = tz.utcfromtimestamp(info.st_mtime)
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with open(path,'r') as f:
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s = f.read()
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try:
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# v1 and v2 and json in the .ipynb files.
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nb = current.reads(s, u'json')
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except ValueError as e:
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msg = u"Unreadable Notebook: %s" % e
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raise web.HTTPError(400, msg, reason=msg)
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return last_modified, nb
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def read_notebook_object(self, notebook_id):
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"""Get the Notebook representation of a notebook by notebook_id."""
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path = self.get_path(notebook_id)
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if not os.path.isfile(path):
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raise web.HTTPError(404, u'Notebook does not exist: %s' % notebook_id)
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last_modified, nb = self.read_notebook_object_from_path(path)
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# Always use the filename as the notebook name.
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# Eventually we will get rid of the notebook name in the metadata
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# but for now, that name is just an empty string. Until the notebooks
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# web service knows about names in URLs we still pass the name
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# back to the web app using the metadata though.
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nb.metadata.name = os.path.splitext(os.path.basename(path))[0]
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return last_modified, nb
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def write_notebook_object(self, nb, notebook_id=None):
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"""Save an existing notebook object by notebook_id."""
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try:
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new_name = normalize('NFC', nb.metadata.name)
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except AttributeError:
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raise web.HTTPError(400, u'Missing notebook name')
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if notebook_id is None:
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notebook_id = self.new_notebook_id(new_name)
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if notebook_id not in self.mapping:
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raise web.HTTPError(404, u'Notebook does not exist: %s' % notebook_id)
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old_name = self.mapping[notebook_id]
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old_checkpoints = self.list_checkpoints(notebook_id)
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path = self.get_path_by_name(new_name)
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# Right before we save the notebook, we write an empty string as the
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# notebook name in the metadata. This is to prepare for removing
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# this attribute entirely post 1.0. The web app still uses the metadata
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# name for now.
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nb.metadata.name = u''
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try:
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self.log.debug("Autosaving notebook %s", path)
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with open(path,'w') 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' % e)
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# save .py script as well
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if self.save_script:
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pypath = os.path.splitext(path)[0] + '.py'
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self.log.debug("Writing script %s", pypath)
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try:
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with io.open(pypath,'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' % e)
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# remove old files if the name changed
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if old_name != new_name:
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# update mapping
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self.mapping[notebook_id] = new_name
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self.rev_mapping[new_name] = notebook_id
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del self.rev_mapping[old_name]
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# remove renamed original, if it exists
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old_path = self.get_path_by_name(old_name)
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if os.path.isfile(old_path):
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self.log.debug("unlinking notebook %s", old_path)
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os.unlink(old_path)
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# cleanup old script, if it exists
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if self.save_script:
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old_pypath = os.path.splitext(old_path)[0] + '.py'
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if os.path.isfile(old_pypath):
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self.log.debug("unlinking script %s", old_pypath)
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os.unlink(old_pypath)
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# rename checkpoints to follow file
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for cp in old_checkpoints:
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checkpoint_id = cp['checkpoint_id']
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old_cp_path = self.get_checkpoint_path_by_name(old_name, checkpoint_id)
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new_cp_path = self.get_checkpoint_path_by_name(new_name, checkpoint_id)
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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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return notebook_id
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def delete_notebook(self, notebook_id):
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"""Delete notebook by notebook_id."""
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nb_path = self.get_path(notebook_id)
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if not os.path.isfile(nb_path):
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raise web.HTTPError(404, u'Notebook does not exist: %s' % notebook_id)
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# clear checkpoints
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for checkpoint in self.list_checkpoints(notebook_id):
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checkpoint_id = checkpoint['checkpoint_id']
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path = self.get_checkpoint_path(notebook_id, checkpoint_id)
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self.log.debug(path)
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if os.path.isfile(path):
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self.log.debug("unlinking checkpoint %s", path)
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os.unlink(path)
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self.log.debug("unlinking notebook %s", nb_path)
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os.unlink(nb_path)
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self.delete_notebook_id(notebook_id)
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def increment_filename(self, basename):
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"""Return a non-used filename of the form basename<int>.
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This searches through the filenames (basename0, basename1, ...)
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until is find one that is not already being used. It is used to
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create Untitled and Copy names that are unique.
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"""
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i = 0
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while True:
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name = u'%s%i' % (basename,i)
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path = self.get_path_by_name(name)
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if not os.path.isfile(path):
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break
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else:
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i = i+1
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return name
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# Checkpoint-related utilities
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def get_checkpoint_path_by_name(self, name, checkpoint_id):
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"""Return a full path to a notebook checkpoint, given its name and checkpoint id."""
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filename = u"{name}-{checkpoint_id}{ext}".format(
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name=name,
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checkpoint_id=checkpoint_id,
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ext=self.filename_ext,
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)
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path = os.path.join(self.checkpoint_dir, filename)
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return path
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def get_checkpoint_path(self, notebook_id, checkpoint_id):
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"""find the path to a checkpoint"""
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name = self.get_name(notebook_id)
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return self.get_checkpoint_path_by_name(name, checkpoint_id)
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def get_checkpoint_info(self, notebook_id, checkpoint_id):
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"""construct the info dict for a given checkpoint"""
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path = self.get_checkpoint_path(notebook_id, checkpoint_id)
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stats = os.stat(path)
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last_modified = tz.utcfromtimestamp(stats.st_mtime)
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info = dict(
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checkpoint_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, notebook_id):
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"""Create a checkpoint from the current state of a notebook"""
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nb_path = self.get_path(notebook_id)
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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(notebook_id, checkpoint_id)
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self.log.debug("creating checkpoint for notebook %s", notebook_id)
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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_info(notebook_id, checkpoint_id)
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def list_checkpoints(self, notebook_id):
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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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checkpoint_id = u"checkpoint"
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path = self.get_checkpoint_path(notebook_id, checkpoint_id)
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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_info(notebook_id, checkpoint_id)]
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def restore_checkpoint(self, notebook_id, checkpoint_id):
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"""restore a notebook to a checkpointed state"""
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self.log.info("restoring Notebook %s from checkpoint %s", notebook_id, checkpoint_id)
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nb_path = self.get_path(notebook_id)
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cp_path = self.get_checkpoint_path(notebook_id, checkpoint_id)
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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' % (notebook_id, checkpoint_id)
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)
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# ensure notebook is readable (never restore from an unreadable notebook)
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last_modified, nb = self.read_notebook_object_from_path(cp_path)
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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, notebook_id, checkpoint_id):
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"""delete a notebook's checkpoint"""
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path = self.get_checkpoint_path(notebook_id, checkpoint_id)
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if not os.path.isfile(path):
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raise web.HTTPError(404,
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u'Notebook checkpoint does not exist: %s-%s' % (notebook_id, checkpoint_id)
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)
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self.log.debug("unlinking %s", path)
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os.unlink(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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