"""A notebook manager that uses the local file system for storage. Authors: * Brian Granger """ #----------------------------------------------------------------------------- # Copyright (C) 2008-2011 The IPython Development Team # # Distributed under the terms of the BSD License. The full license is in # the file COPYING, distributed as part of this software. #----------------------------------------------------------------------------- #----------------------------------------------------------------------------- # Imports #----------------------------------------------------------------------------- import datetime import os import uuid import glob from tornado import web from IPython.config.configurable import LoggingConfigurable from IPython.nbformat import current from IPython.utils.traitlets import Unicode, List, Dict #----------------------------------------------------------------------------- # Code #----------------------------------------------------------------------------- class NotebookManager(LoggingConfigurable): notebook_dir = Unicode(os.getcwd(), config=True, help=""" The directory to use for notebooks. """) filename_ext = Unicode(u'.ipynb') allowed_formats = List([u'json',u'py']) # Map notebook_ids to notebook names mapping = Dict() # Map notebook names to notebook_ids rev_mapping = Dict() def list_notebooks(self): """List all notebooks in the notebook dir. This returns a list of dicts of the form:: dict(notebook_id=notebook,name=name) """ names = glob.glob(os.path.join(self.notebook_dir, '*' + self.filename_ext)) names = [os.path.splitext(os.path.basename(name))[0] for name in names] data = [] for name in names: if name not in self.rev_mapping: notebook_id = self.new_notebook_id(name) else: notebook_id = self.rev_mapping[name] data.append(dict(notebook_id=notebook_id,name=name)) data = sorted(data, key=lambda item: item['name']) return data def new_notebook_id(self, name): """Generate a new notebook_id for a name and store its mappings.""" # TODO: the following will give stable urls for notebooks, but unless # the notebooks are immediately redirected to their new urls when their # filemname changes, nasty inconsistencies result. So for now it's # disabled and instead we use a random uuid4() call. But we leave the # logic here so that we can later reactivate it, whhen the necessary # url redirection code is written. #notebook_id = unicode(uuid.uuid5(uuid.NAMESPACE_URL, # 'file://'+self.get_path_by_name(name).encode('utf-8'))) notebook_id = unicode(uuid.uuid4()) self.mapping[notebook_id] = name self.rev_mapping[name] = notebook_id return notebook_id def delete_notebook_id(self, notebook_id): """Delete a notebook's id only. This doesn't delete the actual notebook.""" name = self.mapping[notebook_id] del self.mapping[notebook_id] del self.rev_mapping[name] def notebook_exists(self, notebook_id): """Does a notebook exist?""" if notebook_id not in self.mapping: return False path = self.get_path_by_name(self.mapping[notebook_id]) return os.path.isfile(path) def find_path(self, notebook_id): """Return a full path to a notebook given its notebook_id.""" try: name = self.mapping[notebook_id] except KeyError: raise web.HTTPError(404, u'Notebook does not exist: %s' % notebook_id) return self.get_path_by_name(name) def get_path_by_name(self, name): """Return a full path to a notebook given its name.""" filename = name + self.filename_ext path = os.path.join(self.notebook_dir, filename) return path def get_notebook(self, notebook_id, format=u'json'): """Get the representation of a notebook in format by notebook_id.""" format = unicode(format) if format not in self.allowed_formats: raise web.HTTPError(415, u'Invalid notebook format: %s' % format) last_modified, nb = self.get_notebook_object(notebook_id) data = current.writes(nb, format) name = nb.get('name','notebook') return last_modified, name, data def get_notebook_object(self, notebook_id): """Get the NotebookNode representation of a notebook by notebook_id.""" path = self.find_path(notebook_id) if not os.path.isfile(path): raise web.HTTPError(404, u'Notebook does not exist: %s' % notebook_id) info = os.stat(path) last_modified = datetime.datetime.utcfromtimestamp(info.st_mtime) with open(path,'r') as f: s = f.read() try: # v1 and v2 and json in the .ipynb files. nb = current.reads(s, u'json') except: raise web.HTTPError(500, u'Unreadable JSON notebook.') if 'name' not in nb: nb.name = os.path.split(path)[-1].split(u'.')[0] return last_modified, nb def save_new_notebook(self, data, name=None, format=u'json'): """Save a new notebook and return its notebook_id. If a name is passed in, it overrides any values in the notebook data and the value in the data is updated to use that value. """ if format not in self.allowed_formats: raise web.HTTPError(415, u'Invalid notebook format: %s' % format) try: nb = current.reads(data, format) except: raise web.HTTPError(400, u'Invalid JSON data') if name is None: try: name = nb.metadata.name except AttributeError: raise web.HTTPError(400, u'Missing notebook name') nb.metadata.name = name notebook_id = self.new_notebook_id(name) self.save_notebook_object(notebook_id, nb) return notebook_id def save_notebook(self, notebook_id, data, name=None, format=u'json'): """Save an existing notebook by notebook_id.""" if format not in self.allowed_formats: raise web.HTTPError(415, u'Invalid notebook format: %s' % format) try: nb = current.reads(data, format) except: raise web.HTTPError(400, u'Invalid JSON data') if name is not None: nb.metadata.name = name self.save_notebook_object(notebook_id, nb) def save_notebook_object(self, notebook_id, nb): """Save an existing notebook object by notebook_id.""" if notebook_id not in self.mapping: raise web.HTTPError(404, u'Notebook does not exist: %s' % notebook_id) old_name = self.mapping[notebook_id] try: new_name = nb.metadata.name except AttributeError: raise web.HTTPError(400, u'Missing notebook name') path = self.get_path_by_name(new_name) try: with open(path,'w') as f: current.write(nb, f, u'json') except: raise web.HTTPError(400, u'Unexpected error while saving notebook') if old_name != new_name: old_path = self.get_path_by_name(old_name) if os.path.isfile(old_path): os.unlink(old_path) self.mapping[notebook_id] = new_name self.rev_mapping[new_name] = notebook_id def delete_notebook(self, notebook_id): """Delete notebook by notebook_id.""" path = self.find_path(notebook_id) if not os.path.isfile(path): raise web.HTTPError(404, u'Notebook does not exist: %s' % notebook_id) os.unlink(path) self.delete_notebook_id(notebook_id) def new_notebook(self): """Create a new notebook and returns its notebook_id.""" i = 0 while True: name = u'Untitled%i' % i path = self.get_path_by_name(name) if not os.path.isfile(path): break else: i = i+1 notebook_id = self.new_notebook_id(name) metadata = current.new_metadata(name=name) nb = current.new_notebook(metadata=metadata) with open(path,'w') as f: current.write(nb, f, u'json') return notebook_id