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# Licensed under the MIT License.

import sys

import logging

import os

from datascience.daemon.daemon_python import (

error_decorator,

PythonDaemon as BasePythonDaemon,

change_exec_context,

)

class PythonDaemon(BasePythonDaemon):

def __init__(self, rx, tx):

super().__init__(rx, tx)

self.log.info("DataScience Daemon init")

def __getitem__(self, item):

"""Override getitem to ensure we use these methods."""

self.log.info("Execute rpc method %s in DS Daemon", item)

return super().__getitem__(item)

@error_decorator

def m_exec_module(self, module_name, args=[], cwd=None, env=None):

self.log.info("Exec in DS Daemon %s with args %s", module_name, args)

args = [] if args is None else args

if module_name == "jupyter" and args == ["kernelspec", "list"]:

return self._execute_and_capture_output(self._print_kernel_list)

elif module_name == "jupyter" and args == ["kernelspec", "--version"]:

return self._execute_and_capture_output(self._print_kernelspec_version)

elif module_name == "jupyter" and args[0] == "nbconvert" and args[-1] != "--version":

return self._execute_and_capture_output(lambda : self._convert(args))

else:

self.log.info("check base class stuff")

return super().m_exec_module(module_name, args, cwd, env)

@error_decorator

def m_exec_module_observable(self, module_name, args=None, cwd=None, env=None):

self.log.info("Exec in DS Daemon (observable) %s with args %s", module_name, args)

args = [] if args is None else args

# Assumption is that `python -m jupyter notebook` or `python -m notebook` with observable output

# will only ever be used to start a notebook and nothing else.

# E.g. `python -m jupyter notebook --version` wouldn't require the use of exec_module_observable,

# In such cases, we can get the output immediately.

if (module_name == "jupyter" and args[0] == "notebook") or (

module_name == "notebook"

# Args must not have ['notebook'] in the begining. Drop the `notebook` subcommand when using `jupyter`

args = args[1:] if args[0] == "notebook" else args

self.log.info("Starting notebook with args %s", args)

# When launching notebook always ensure the first argument is `notebook`.

with change_exec_context(args, cwd, env):

self._start_notebook(args)

else:

return super().m_exec_module_observable(module_name, args, cwd, env)

def _print_kernelspec_version(self):

import jupyter_client

# Check whether kernelspec module exists.

import jupyter_client.kernelspec

sys.stdout.write(jupyter_client.__version__)

sys.stdout.flush()

def _print_kernelspec_version(self):

import jupyter_client

# Check whether kernelspec module exists.

import jupyter_client.kernelspec

sys.stdout.write(jupyter_client.__version__)

sys.stdout.flush()

def _print_kernel_list(self):

self.log.info("check kernels")

# Get kernel specs.

import jupyter_client.kernelspec

specs = jupyter_client.kernelspec.find_kernel_specs()

sys.stdout.write(

os.linesep.join(list("{0} {1}".format(k, v) for k, v in specs.items()))

)

sys.stdout.flush()

def _convert(self, args):

self.log.info("nbconvert")

from nbconvert import nbconvertapp as app

sys.argv = [""] + args

app.main()

def _start_notebook(self, args):

from notebook import notebookapp as app

sys.argv = [""] + args

app.launch_new_instance()