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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) 2008-2011 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 os
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import uuid
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import glob
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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 Unicode, List, Dict
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#-----------------------------------------------------------------------------
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# Code
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#-----------------------------------------------------------------------------
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class NotebookManager(LoggingConfigurable):
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notebook_dir = Unicode(os.getcwd(), config=True, help="""
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The directory to use for notebooks.
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""")
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filename_ext = Unicode(u'.ipynb')
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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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# Map notebook names to notebook_ids
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rev_mapping = Dict()
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def list_notebooks(self):
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"""List all notebooks in the notebook dir.
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This returns a list of dicts of the form::
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dict(notebook_id=notebook,name=name)
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"""
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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 = [os.path.splitext(os.path.basename(name))[0]
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for name in 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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# 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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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 only. This doesn't delete the actual notebook."""
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name = self.mapping[notebook_id]
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del self.mapping[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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if notebook_id not in self.mapping:
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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 find_path(self, notebook_id):
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"""Return a full path to a notebook given its notebook_id."""
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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 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 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.get_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.get('name','notebook')
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return last_modified, name, data
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def get_notebook_object(self, notebook_id):
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"""Get the NotebookNode representation of a notebook by notebook_id."""
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path = self.find_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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info = os.stat(path)
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last_modified = datetime.datetime.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:
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raise web.HTTPError(500, u'Unreadable JSON notebook.')
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if 'name' not in nb:
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nb.name = os.path.split(path)[-1].split(u'.')[0]
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return last_modified, nb
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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.new_notebook_id(name)
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self.save_notebook_object(notebook_id, 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.save_notebook_object(notebook_id, nb)
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def save_notebook_object(self, notebook_id, nb):
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"""Save an existing notebook object by notebook_id."""
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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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try:
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new_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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path = self.get_path_by_name(new_name)
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try:
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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:
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raise web.HTTPError(400, u'Unexpected error while saving notebook')
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if old_name != new_name:
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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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os.unlink(old_path)
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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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def delete_notebook(self, notebook_id):
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"""Delete notebook by notebook_id."""
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path = self.find_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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os.unlink(path)
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self.delete_notebook_id(notebook_id)
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def new_notebook(self):
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"""Create a new notebook and returns its notebook_id."""
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i = 0
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while True:
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name = u'Untitled%i' % 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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notebook_id = self.new_notebook_id(name)
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metadata = current.new_metadata(name=name)
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nb = current.new_notebook(metadata=metadata)
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with open(path,'w') as f:
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current.write(nb, f, u'json')
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return notebook_id
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