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"""A base class notebook manager.
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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 os
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import uuid
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from tornado import web
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from IPython.config.configurable import LoggingConfigurable
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from IPython.nbformat import current
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from IPython.utils.traitlets import List, Dict, Unicode, TraitError
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#-----------------------------------------------------------------------------
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# Classes
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#-----------------------------------------------------------------------------
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class NotebookManager(LoggingConfigurable):
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# Todo:
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# The notebook_dir attribute is used to mean a couple of different things:
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# 1. Where the notebooks are stored if FileNotebookManager is used.
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# 2. The cwd of the kernel for a project.
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# Right now we use this attribute in a number of different places and
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# we are going to have to disentangle all of this.
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notebook_dir = Unicode(os.getcwdu(), config=True, help="""
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The directory to use for notebooks.
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""")
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def _notebook_dir_changed(self, name, old, new):
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"""do a bit of validation of the notebook 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.notebook_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("notebook 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 notebook 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 notebook dir %r" % new)
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allowed_formats = List([u'json',u'py'])
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# Map notebook_ids to notebook names
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mapping = Dict()
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def load_notebook_names(self):
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"""Load the notebook names into memory.
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This should be called once immediately after the notebook manager
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is created to load the existing notebooks into the mapping in
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memory.
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"""
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self.list_notebooks()
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def list_notebooks(self):
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"""List all notebooks.
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This returns a list of dicts, each of the form::
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dict(notebook_id=notebook,name=name)
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This list of dicts should be sorted by name::
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data = sorted(data, key=lambda item: item['name'])
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"""
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raise NotImplementedError('must be implemented in a subclass')
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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 mapping."""
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# TODO: the following will give stable urls for notebooks, but unless
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# the notebooks are immediately redirected to their new urls when their
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# filemname changes, nasty inconsistencies result. So for now it's
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# disabled and instead we use a random uuid4() call. But we leave the
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# logic here so that we can later reactivate it, whhen the necessary
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# url redirection code is written.
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#notebook_id = unicode(uuid.uuid5(uuid.NAMESPACE_URL,
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# 'file://'+self.get_path_by_name(name).encode('utf-8')))
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notebook_id = unicode(uuid.uuid4())
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self.mapping[notebook_id] = name
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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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This doesn't delete the actual notebook, only its entry in the mapping.
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"""
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del self.mapping[notebook_id]
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def notebook_exists(self, notebook_id):
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"""Does a notebook exist?"""
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return notebook_id in self.mapping
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def get_notebook(self, notebook_id, format=u'json'):
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"""Get the representation of a notebook in format by notebook_id."""
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format = unicode(format)
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if format not in self.allowed_formats:
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raise web.HTTPError(415, u'Invalid notebook format: %s' % format)
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last_modified, nb = self.read_notebook_object(notebook_id)
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kwargs = {}
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if format == 'json':
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# don't split lines for sending over the wire, because it
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# should match the Python in-memory format.
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kwargs['split_lines'] = False
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data = current.writes(nb, format, **kwargs)
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name = nb.metadata.get('name','notebook')
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return last_modified, name, data
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def read_notebook_object(self, notebook_id):
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"""Get the object representation of a notebook by notebook_id."""
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raise NotImplementedError('must be implemented in a subclass')
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def save_new_notebook(self, data, name=None, format=u'json'):
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"""Save a new notebook and return its notebook_id.
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If a name is passed in, it overrides any values in the notebook data
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and the value in the data is updated to use that value.
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"""
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if format not in self.allowed_formats:
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raise web.HTTPError(415, u'Invalid notebook format: %s' % format)
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try:
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nb = current.reads(data.decode('utf-8'), format)
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except:
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raise web.HTTPError(400, u'Invalid JSON data')
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if name is None:
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try:
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name = 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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nb.metadata.name = name
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notebook_id = self.write_notebook_object(nb)
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return notebook_id
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def save_notebook(self, notebook_id, data, name=None, format=u'json'):
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"""Save an existing notebook by notebook_id."""
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if format not in self.allowed_formats:
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raise web.HTTPError(415, u'Invalid notebook format: %s' % format)
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try:
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nb = current.reads(data.decode('utf-8'), format)
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except:
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raise web.HTTPError(400, u'Invalid JSON data')
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if name is not None:
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nb.metadata.name = name
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self.write_notebook_object(nb, notebook_id)
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def write_notebook_object(self, nb, notebook_id=None):
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"""Write a notebook object and return its notebook_id.
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If notebook_id is None, this method should create a new notebook_id.
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If notebook_id is not None, this method should check to make sure it
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exists and is valid.
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"""
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raise NotImplementedError('must be implemented in a subclass')
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def delete_notebook(self, notebook_id):
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"""Delete notebook by notebook_id."""
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raise NotImplementedError('must be implemented in a subclass')
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def increment_filename(self, name):
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"""Increment a filename to make it unique.
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This exists for notebook stores that must have unique names. When a notebook
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is created or copied this method constructs a unique filename, typically
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by appending an integer to the name.
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"""
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return name
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def new_notebook(self):
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"""Create a new notebook and return its notebook_id."""
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name = self.increment_filename('Untitled')
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metadata = current.new_metadata(name=name)
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nb = current.new_notebook(metadata=metadata)
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notebook_id = self.write_notebook_object(nb)
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return notebook_id
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def copy_notebook(self, notebook_id):
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"""Copy an existing notebook and return its notebook_id."""
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last_mod, nb = self.read_notebook_object(notebook_id)
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name = nb.metadata.name + '-Copy'
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name = self.increment_filename(name)
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nb.metadata.name = name
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notebook_id = self.write_notebook_object(nb)
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return notebook_id
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# Checkpoint-related
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def create_checkpoint(self, notebook_id):
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"""Create a checkpoint of the current state of a notebook
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Returns a checkpoint_id for the new checkpoint.
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"""
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raise NotImplementedError("must be implemented in a subclass")
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def list_checkpoints(self, notebook_id):
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"""Return a list of checkpoints for a given notebook"""
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return []
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def restore_checkpoint(self, notebook_id, checkpoint_id):
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"""Restore a notebook from one of its checkpoints"""
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raise NotImplementedError("must be implemented in a subclass")
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def delete_checkpoint(self, notebook_id, checkpoint_id):
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"""delete a checkpoint for a notebook"""
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raise NotImplementedError("must be implemented in a subclass")
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def log_info(self):
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self.log.info(self.info_string())
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def info_string(self):
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return "Serving notebooks"
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