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692 lines
25 KiB
Python
692 lines
25 KiB
Python
"""A ZMQ-based subclass of InteractiveShell.
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This code is meant to ease the refactoring of the base InteractiveShell into
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something with a cleaner architecture for 2-process use, without actually
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breaking InteractiveShell itself. So we're doing something a bit ugly, where
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we subclass and override what we want to fix. Once this is working well, we
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can go back to the base class and refactor the code for a cleaner inheritance
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implementation that doesn't rely on so much monkeypatching.
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But this lets us maintain a fully working IPython as we develop the new
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machinery. This should thus be thought of as scaffolding.
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"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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import os
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import sys
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import warnings
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from pathlib import Path
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from threading import local
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from IPython.core import page
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from IPython.core.autocall import ZMQExitAutocall
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from IPython.core.displaypub import DisplayPublisher
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from IPython.core.error import UsageError
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from IPython.core.interactiveshell import InteractiveShell, InteractiveShellABC
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from IPython.core.magic import Magics, line_magic, magics_class
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from IPython.core.magics import CodeMagics, MacroToEdit # type:ignore[attr-defined]
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from IPython.core.usage import default_banner
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from IPython.display import Javascript, display
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from IPython.utils import openpy
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from IPython.utils.process import arg_split, system # type:ignore[attr-defined]
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from jupyter_client.session import Session, extract_header
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from jupyter_core.paths import jupyter_runtime_dir
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from traitlets import Any, CBool, CBytes, Dict, Instance, Type, default, observe
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from ipykernel import connect_qtconsole, get_connection_file, get_connection_info
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from ipykernel.displayhook import ZMQShellDisplayHook
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from ipykernel.jsonutil import encode_images, json_clean
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# -----------------------------------------------------------------------------
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# Functions and classes
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# -----------------------------------------------------------------------------
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class ZMQDisplayPublisher(DisplayPublisher):
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"""A display publisher that publishes data using a ZeroMQ PUB socket."""
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session = Instance(Session, allow_none=True)
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pub_socket = Any(allow_none=True)
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parent_header = Dict({})
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topic = CBytes(b"display_data")
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# thread_local:
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# An attribute used to ensure the correct output message
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# is processed. See ipykernel Issue 113 for a discussion.
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_thread_local = Any()
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def set_parent(self, parent):
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"""Set the parent for outbound messages."""
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self.parent_header = extract_header(parent)
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def _flush_streams(self):
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"""flush IO Streams prior to display"""
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sys.stdout.flush()
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sys.stderr.flush()
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@default("_thread_local")
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def _default_thread_local(self):
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"""Initialize our thread local storage"""
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return local()
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@property
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def _hooks(self):
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if not hasattr(self._thread_local, "hooks"):
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# create new list for a new thread
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self._thread_local.hooks = []
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return self._thread_local.hooks
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def publish(
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self,
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data,
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metadata=None,
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transient=None,
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update=False,
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):
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"""Publish a display-data message
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Parameters
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----------
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data : dict
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A mime-bundle dict, keyed by mime-type.
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metadata : dict, optional
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Metadata associated with the data.
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transient : dict, optional, keyword-only
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Transient data that may only be relevant during a live display,
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such as display_id.
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Transient data should not be persisted to documents.
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update : bool, optional, keyword-only
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If True, send an update_display_data message instead of display_data.
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"""
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self._flush_streams()
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if metadata is None:
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metadata = {}
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if transient is None:
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transient = {}
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self._validate_data(data, metadata)
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content = {}
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content["data"] = encode_images(data)
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content["metadata"] = metadata
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content["transient"] = transient
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msg_type = "update_display_data" if update else "display_data"
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# Use 2-stage process to send a message,
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# in order to put it through the transform
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# hooks before potentially sending.
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assert self.session is not None
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msg = self.session.msg(msg_type, json_clean(content), parent=self.parent_header)
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# Each transform either returns a new
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# message or None. If None is returned,
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# the message has been 'used' and we return.
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for hook in self._hooks:
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msg = hook(msg)
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if msg is None:
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return # type:ignore[unreachable]
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self.session.send(
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self.pub_socket,
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msg,
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ident=self.topic,
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)
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def clear_output(self, wait=False):
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"""Clear output associated with the current execution (cell).
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Parameters
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----------
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wait : bool (default: False)
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If True, the output will not be cleared immediately,
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instead waiting for the next display before clearing.
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This reduces bounce during repeated clear & display loops.
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"""
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content = dict(wait=wait)
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self._flush_streams()
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assert self.session is not None
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msg = self.session.msg("clear_output", json_clean(content), parent=self.parent_header)
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# see publish() for details on how this works
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for hook in self._hooks:
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msg = hook(msg)
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if msg is None:
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return # type:ignore[unreachable]
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self.session.send(
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self.pub_socket,
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msg,
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ident=self.topic,
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)
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def register_hook(self, hook):
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"""
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Registers a hook with the thread-local storage.
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Parameters
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----------
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hook : Any callable object
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Returns
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-------
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Either a publishable message, or `None`.
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The DisplayHook objects must return a message from
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the __call__ method if they still require the
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`session.send` method to be called after transformation.
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Returning `None` will halt that execution path, and
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session.send will not be called.
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"""
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self._hooks.append(hook)
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def unregister_hook(self, hook):
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"""
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Un-registers a hook with the thread-local storage.
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Parameters
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----------
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hook : Any callable object which has previously been
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registered as a hook.
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Returns
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-------
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bool - `True` if the hook was removed, `False` if it wasn't
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found.
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"""
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try:
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self._hooks.remove(hook)
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return True
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except ValueError:
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return False
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@magics_class
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class KernelMagics(Magics):
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"""Kernel magics."""
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# ------------------------------------------------------------------------
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# Magic overrides
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# ------------------------------------------------------------------------
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# Once the base class stops inheriting from magic, this code needs to be
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# moved into a separate machinery as well. For now, at least isolate here
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# the magics which this class needs to implement differently from the base
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# class, or that are unique to it.
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@line_magic
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def edit(self, parameter_s="", last_call=None):
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"""Bring up an editor and execute the resulting code.
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Usage:
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%edit [options] [args]
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%edit runs an external text editor. You will need to set the command for
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this editor via the ``TerminalInteractiveShell.editor`` option in your
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configuration file before it will work.
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This command allows you to conveniently edit multi-line code right in
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your IPython session.
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If called without arguments, %edit opens up an empty editor with a
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temporary file and will execute the contents of this file when you
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close it (don't forget to save it!).
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Options:
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-n <number>
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Open the editor at a specified line number. By default, the IPython
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editor hook uses the unix syntax 'editor +N filename', but you can
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configure this by providing your own modified hook if your favorite
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editor supports line-number specifications with a different syntax.
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-p
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Call the editor with the same data as the previous time it was used,
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regardless of how long ago (in your current session) it was.
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-r
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Use 'raw' input. This option only applies to input taken from the
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user's history. By default, the 'processed' history is used, so that
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magics are loaded in their transformed version to valid Python. If
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this option is given, the raw input as typed as the command line is
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used instead. When you exit the editor, it will be executed by
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IPython's own processor.
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Arguments:
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If arguments are given, the following possibilities exist:
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- The arguments are numbers or pairs of colon-separated numbers (like
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1 4:8 9). These are interpreted as lines of previous input to be
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loaded into the editor. The syntax is the same of the %macro command.
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- If the argument doesn't start with a number, it is evaluated as a
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variable and its contents loaded into the editor. You can thus edit
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any string which contains python code (including the result of
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previous edits).
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- If the argument is the name of an object (other than a string),
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IPython will try to locate the file where it was defined and open the
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editor at the point where it is defined. You can use ``%edit function``
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to load an editor exactly at the point where 'function' is defined,
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edit it and have the file be executed automatically.
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If the object is a macro (see %macro for details), this opens up your
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specified editor with a temporary file containing the macro's data.
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Upon exit, the macro is reloaded with the contents of the file.
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Note: opening at an exact line is only supported under Unix, and some
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editors (like kedit and gedit up to Gnome 2.8) do not understand the
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'+NUMBER' parameter necessary for this feature. Good editors like
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(X)Emacs, vi, jed, pico and joe all do.
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- If the argument is not found as a variable, IPython will look for a
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file with that name (adding .py if necessary) and load it into the
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editor. It will execute its contents with execfile() when you exit,
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loading any code in the file into your interactive namespace.
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Unlike in the terminal, this is designed to use a GUI editor, and we do
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not know when it has closed. So the file you edit will not be
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automatically executed or printed.
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Note that %edit is also available through the alias %ed.
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"""
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last_call = last_call or ["", ""]
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opts, args = self.parse_options(parameter_s, "prn:")
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try:
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filename, lineno, _ = CodeMagics._find_edit_target(self.shell, args, opts, last_call)
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except MacroToEdit:
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# TODO: Implement macro editing over 2 processes.
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print("Macro editing not yet implemented in 2-process model.")
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return
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# Make sure we send to the client an absolute path, in case the working
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# directory of client and kernel don't match
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filename = str(Path(filename).resolve())
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payload = {"source": "edit_magic", "filename": filename, "line_number": lineno}
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assert self.shell is not None
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self.shell.payload_manager.write_payload(payload)
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# A few magics that are adapted to the specifics of using pexpect and a
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# remote terminal
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@line_magic
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def clear(self, arg_s):
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"""Clear the terminal."""
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assert self.shell is not None
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if os.name == "posix":
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self.shell.system("clear")
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else:
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self.shell.system("cls")
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if os.name == "nt":
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# This is the usual name in windows
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cls = line_magic("cls")(clear)
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# Terminal pagers won't work over pexpect, but we do have our own pager
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@line_magic
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def less(self, arg_s):
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"""Show a file through the pager.
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Files ending in .py are syntax-highlighted."""
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if not arg_s:
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msg = "Missing filename."
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raise UsageError(msg)
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if arg_s.endswith(".py"):
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assert self.shell is not None
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cont = self.shell.pycolorize(openpy.read_py_file(arg_s, skip_encoding_cookie=False))
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else:
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with open(arg_s) as fid:
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cont = fid.read()
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page.page(cont)
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more = line_magic("more")(less)
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# Man calls a pager, so we also need to redefine it
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if os.name == "posix":
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@line_magic
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def man(self, arg_s):
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"""Find the man page for the given command and display in pager."""
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assert self.shell is not None
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page.page(self.shell.getoutput("man %s | col -b" % arg_s, split=False))
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@line_magic
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def connect_info(self, arg_s):
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"""Print information for connecting other clients to this kernel
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It will print the contents of this session's connection file, as well as
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shortcuts for local clients.
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In the simplest case, when called from the most recently launched kernel,
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secondary clients can be connected, simply with:
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$> jupyter <app> --existing
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"""
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try:
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connection_file = get_connection_file()
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info = get_connection_info(unpack=False)
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except Exception as e:
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warnings.warn("Could not get connection info: %r" % e, stacklevel=2)
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return
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# if it's in the default dir, truncate to basename
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if jupyter_runtime_dir() == str(Path(connection_file).parent):
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connection_file = Path(connection_file).name
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assert isinstance(info, str)
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print(info + "\n")
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print(
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f"Paste the above JSON into a file, and connect with:\n"
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f" $> jupyter <app> --existing <file>\n"
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f"or, if you are local, you can connect with just:\n"
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f" $> jupyter <app> --existing {connection_file}\n"
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f"or even just:\n"
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f" $> jupyter <app> --existing\n"
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f"if this is the most recent Jupyter kernel you have started."
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)
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@line_magic
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def qtconsole(self, arg_s):
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"""Open a qtconsole connected to this kernel.
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Useful for connecting a qtconsole to running notebooks, for better
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debugging.
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"""
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# %qtconsole should imply bind_kernel for engines:
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# FIXME: move to ipyparallel Kernel subclass
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if "ipyparallel" in sys.modules:
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from ipyparallel import bind_kernel
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bind_kernel()
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try:
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connect_qtconsole(argv=arg_split(arg_s, os.name == "posix"))
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except Exception as e:
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warnings.warn("Could not start qtconsole: %r" % e, stacklevel=2)
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return
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@line_magic
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def autosave(self, arg_s):
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"""Set the autosave interval in the notebook (in seconds).
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The default value is 120, or two minutes.
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``%autosave 0`` will disable autosave.
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This magic only has an effect when called from the notebook interface.
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It has no effect when called in a startup file.
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"""
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try:
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interval = int(arg_s)
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except ValueError as e:
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raise UsageError("%%autosave requires an integer, got %r" % arg_s) from e
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# javascript wants milliseconds
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milliseconds = 1000 * interval
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display(
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Javascript("IPython.notebook.set_autosave_interval(%i)" % milliseconds),
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include=["application/javascript"],
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)
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if interval:
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print("Autosaving every %i seconds" % interval)
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else:
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print("Autosave disabled")
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class ZMQInteractiveShell(InteractiveShell):
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"""A subclass of InteractiveShell for ZMQ."""
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displayhook_class = Type(ZMQShellDisplayHook)
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display_pub_class = Type(ZMQDisplayPublisher)
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data_pub_class = Any() # type:ignore[assignment]
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kernel = Any()
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parent_header = Any()
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@default("banner1")
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def _default_banner1(self):
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return default_banner
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# Override the traitlet in the parent class, because there's no point using
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# readline for the kernel. Can be removed when the readline code is moved
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# to the terminal frontend.
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readline_use = CBool(False)
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# autoindent has no meaning in a zmqshell, and attempting to enable it
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# will print a warning in the absence of readline.
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autoindent = CBool(False)
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exiter = Instance(ZMQExitAutocall)
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@default("exiter")
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def _default_exiter(self):
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return ZMQExitAutocall(self)
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@observe("exit_now")
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def _update_exit_now(self, change):
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"""stop eventloop when exit_now fires"""
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if change["new"]:
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if hasattr(self.kernel, "io_loop"):
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loop = self.kernel.io_loop
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loop.call_later(0.1, loop.stop)
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if self.kernel.eventloop:
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exit_hook = getattr(self.kernel.eventloop, "exit_hook", None)
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if exit_hook:
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exit_hook(self.kernel)
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keepkernel_on_exit = None
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# Over ZeroMQ, GUI control isn't done with PyOS_InputHook as there is no
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# interactive input being read; we provide event loop support in ipkernel
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def enable_gui(self, gui):
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"""Enable a given guil."""
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from .eventloops import enable_gui as real_enable_gui
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try:
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real_enable_gui(gui)
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self.active_eventloop = gui
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except ValueError as e:
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raise UsageError("%s" % e) from e
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def init_environment(self):
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"""Configure the user's environment."""
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env = os.environ
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# These two ensure 'ls' produces nice coloring on BSD-derived systems
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env["TERM"] = "xterm-color"
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env["CLICOLOR"] = "1"
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# These two add terminal color in tools that support it.
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env["FORCE_COLOR"] = "1"
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env["CLICOLOR_FORCE"] = "1"
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# Since normal pagers don't work at all (over pexpect we don't have
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# single-key control of the subprocess), try to disable paging in
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# subprocesses as much as possible.
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env["PAGER"] = "cat"
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env["GIT_PAGER"] = "cat"
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def payloadpage_page(self, strg, start=0, screen_lines=0, pager_cmd=None):
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"""Print a string, piping through a pager.
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|
|
This version ignores the screen_lines and pager_cmd arguments and uses
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IPython's payload system instead.
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|
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Parameters
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----------
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strg : str or mime-dict
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Text to page, or a mime-type keyed dict of already formatted data.
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start : int
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Starting line at which to place the display.
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"""
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# Some routines may auto-compute start offsets incorrectly and pass a
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# negative value. Offset to 0 for robustness.
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start = max(0, start)
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|
|
data = strg if isinstance(strg, dict) else {"text/plain": strg}
|
|
|
|
payload = dict(
|
|
source="page",
|
|
data=data,
|
|
start=start,
|
|
)
|
|
assert self.payload_manager is not None
|
|
self.payload_manager.write_payload(payload)
|
|
|
|
def init_hooks(self):
|
|
"""Initialize hooks."""
|
|
super().init_hooks()
|
|
self.set_hook("show_in_pager", page.as_hook(self.payloadpage_page), 99)
|
|
|
|
def init_data_pub(self):
|
|
"""Delay datapub init until request, for deprecation warnings"""
|
|
|
|
@property
|
|
def data_pub(self):
|
|
if not hasattr(self, "_data_pub"):
|
|
warnings.warn(
|
|
"InteractiveShell.data_pub is deprecated outside IPython parallel.",
|
|
DeprecationWarning,
|
|
stacklevel=2,
|
|
)
|
|
|
|
self._data_pub = self.data_pub_class(parent=self) # type:ignore[has-type]
|
|
self._data_pub.session = self.display_pub.session # type:ignore[attr-defined]
|
|
self._data_pub.pub_socket = self.display_pub.pub_socket # type:ignore[attr-defined]
|
|
return self._data_pub
|
|
|
|
@data_pub.setter
|
|
def data_pub(self, pub):
|
|
self._data_pub = pub
|
|
|
|
def ask_exit(self):
|
|
"""Engage the exit actions."""
|
|
self.exit_now = not self.keepkernel_on_exit
|
|
payload = dict(
|
|
source="ask_exit",
|
|
keepkernel=self.keepkernel_on_exit,
|
|
)
|
|
self.payload_manager.write_payload(payload) # type:ignore[union-attr]
|
|
|
|
def run_cell(self, *args, **kwargs):
|
|
"""Run a cell."""
|
|
self._last_traceback = None
|
|
return super().run_cell(*args, **kwargs)
|
|
|
|
def _showtraceback(self, etype, evalue, stb):
|
|
# try to preserve ordering of tracebacks and print statements
|
|
sys.stdout.flush()
|
|
sys.stderr.flush()
|
|
|
|
exc_content = {
|
|
"traceback": stb,
|
|
"ename": str(etype.__name__),
|
|
"evalue": str(evalue),
|
|
}
|
|
|
|
dh = self.displayhook
|
|
# Send exception info over pub socket for other clients than the caller
|
|
# to pick up
|
|
topic = None
|
|
if dh.topic: # type:ignore[attr-defined]
|
|
topic = dh.topic.replace(b"execute_result", b"error") # type:ignore[attr-defined]
|
|
|
|
dh.session.send( # type:ignore[attr-defined]
|
|
dh.pub_socket, # type:ignore[attr-defined]
|
|
"error",
|
|
json_clean(exc_content),
|
|
dh.parent_header, # type:ignore[attr-defined]
|
|
ident=topic,
|
|
)
|
|
|
|
# FIXME - Once we rely on Python 3, the traceback is stored on the
|
|
# exception object, so we shouldn't need to store it here.
|
|
self._last_traceback = stb
|
|
|
|
def set_next_input(self, text, replace=False):
|
|
"""Send the specified text to the frontend to be presented at the next
|
|
input cell."""
|
|
payload = dict(
|
|
source="set_next_input",
|
|
text=text,
|
|
replace=replace,
|
|
)
|
|
self.payload_manager.write_payload(payload) # type:ignore[union-attr]
|
|
|
|
def set_parent(self, parent):
|
|
"""Set the parent header for associating output with its triggering input"""
|
|
self.parent_header = parent
|
|
self.displayhook.set_parent(parent) # type:ignore[attr-defined]
|
|
self.display_pub.set_parent(parent) # type:ignore[attr-defined]
|
|
if hasattr(self, "_data_pub"):
|
|
self.data_pub.set_parent(parent)
|
|
try:
|
|
sys.stdout.set_parent(parent) # type:ignore[attr-defined]
|
|
except AttributeError:
|
|
pass
|
|
try:
|
|
sys.stderr.set_parent(parent) # type:ignore[attr-defined]
|
|
except AttributeError:
|
|
pass
|
|
|
|
def get_parent(self):
|
|
"""Get the parent header."""
|
|
return self.parent_header
|
|
|
|
def init_magics(self):
|
|
"""Initialize magics."""
|
|
super().init_magics()
|
|
self.register_magics(KernelMagics)
|
|
self.magics_manager.register_alias("ed", "edit")
|
|
|
|
def init_virtualenv(self):
|
|
"""Initialize virtual environment."""
|
|
# Overridden not to do virtualenv detection, because it's probably
|
|
# not appropriate in a kernel. To use a kernel in a virtualenv, install
|
|
# it inside the virtualenv.
|
|
# https://ipython.readthedocs.io/en/latest/install/kernel_install.html
|
|
|
|
def system_piped(self, cmd):
|
|
"""Call the given cmd in a subprocess, piping stdout/err
|
|
|
|
Parameters
|
|
----------
|
|
cmd : str
|
|
Command to execute (can not end in '&', as background processes are
|
|
not supported. Should not be a command that expects input
|
|
other than simple text.
|
|
"""
|
|
if cmd.rstrip().endswith("&"):
|
|
# this is *far* from a rigorous test
|
|
# We do not support backgrounding processes because we either use
|
|
# pexpect or pipes to read from. Users can always just call
|
|
# os.system() or use ip.system=ip.system_raw
|
|
# if they really want a background process.
|
|
msg = "Background processes not supported."
|
|
raise OSError(msg)
|
|
|
|
# we explicitly do NOT return the subprocess status code, because
|
|
# a non-None value would trigger :func:`sys.displayhook` calls.
|
|
# Instead, we store the exit_code in user_ns.
|
|
# Also, protect system call from UNC paths on Windows here too
|
|
# as is done in InteractiveShell.system_raw
|
|
if sys.platform == "win32":
|
|
cmd = self.var_expand(cmd, depth=1)
|
|
from IPython.utils._process_win32 import AvoidUNCPath
|
|
|
|
with AvoidUNCPath() as path:
|
|
if path is not None:
|
|
cmd = f"pushd {path} &&{cmd}"
|
|
self.user_ns["_exit_code"] = system(cmd)
|
|
else:
|
|
self.user_ns["_exit_code"] = system(self.var_expand(cmd, depth=1))
|
|
|
|
# Ensure new system_piped implementation is used
|
|
system = system_piped
|
|
|
|
|
|
InteractiveShellABC.register(ZMQInteractiveShell)
|