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"""Magic functions for running cells in various scripts."""
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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 asyncio
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import atexit
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import errno
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import functools
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import os
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import signal
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import sys
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import time
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from contextlib import contextmanager
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from subprocess import CalledProcessError
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from traitlets import Dict, List, default
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from IPython.core import magic_arguments
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from IPython.core.magic import Magics, cell_magic, line_magic, magics_class
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from IPython.lib.backgroundjobs import BackgroundJobManager
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from IPython.utils.process import arg_split
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#-----------------------------------------------------------------------------
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# Magic implementation classes
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#-----------------------------------------------------------------------------
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def script_args(f):
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"""single decorator for adding script args"""
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args = [
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magic_arguments.argument(
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'--out', type=str,
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help="""The variable in which to store stdout from the script.
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If the script is backgrounded, this will be the stdout *pipe*,
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instead of the stderr text itself and will not be auto closed.
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"""
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),
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magic_arguments.argument(
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'--err', type=str,
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help="""The variable in which to store stderr from the script.
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If the script is backgrounded, this will be the stderr *pipe*,
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instead of the stderr text itself and will not be autoclosed.
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"""
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),
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magic_arguments.argument(
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'--bg', action="store_true",
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help="""Whether to run the script in the background.
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If given, the only way to see the output of the command is
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with --out/err.
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"""
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),
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magic_arguments.argument(
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'--proc', type=str,
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help="""The variable in which to store Popen instance.
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This is used only when --bg option is given.
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"""
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),
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magic_arguments.argument(
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'--no-raise-error', action="store_false", dest='raise_error',
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help="""Whether you should raise an error message in addition to
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a stream on stderr if you get a nonzero exit code.
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"""
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)
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]
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for arg in args:
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f = arg(f)
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return f
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@contextmanager
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def safe_watcher():
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if sys.platform == "win32":
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yield
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return
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from asyncio import SafeChildWatcher
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policy = asyncio.get_event_loop_policy()
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old_watcher = policy.get_child_watcher()
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if isinstance(old_watcher, SafeChildWatcher):
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yield
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return
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loop = asyncio.get_event_loop()
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try:
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watcher = asyncio.SafeChildWatcher()
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watcher.attach_loop(loop)
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policy.set_child_watcher(watcher)
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yield
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finally:
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watcher.close()
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policy.set_child_watcher(old_watcher)
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def dec_safe_watcher(fun):
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@functools.wraps(fun)
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def _inner(*args, **kwargs):
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with safe_watcher():
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return fun(*args, **kwargs)
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return _inner
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@magics_class
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class ScriptMagics(Magics):
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"""Magics for talking to scripts
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This defines a base `%%script` cell magic for running a cell
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with a program in a subprocess, and registers a few top-level
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magics that call %%script with common interpreters.
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"""
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script_magics = List(
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help="""Extra script cell magics to define
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This generates simple wrappers of `%%script foo` as `%%foo`.
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If you want to add script magics that aren't on your path,
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specify them in script_paths
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""",
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).tag(config=True)
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@default('script_magics')
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def _script_magics_default(self):
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"""default to a common list of programs"""
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defaults = [
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'sh',
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'bash',
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'perl',
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'ruby',
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'python',
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'python2',
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'python3',
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'pypy',
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]
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if os.name == 'nt':
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defaults.extend([
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'cmd',
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])
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return defaults
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script_paths = Dict(
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help="""Dict mapping short 'ruby' names to full paths, such as '/opt/secret/bin/ruby'
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Only necessary for items in script_magics where the default path will not
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find the right interpreter.
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"""
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).tag(config=True)
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def __init__(self, shell=None):
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super(ScriptMagics, self).__init__(shell=shell)
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self._generate_script_magics()
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self.job_manager = BackgroundJobManager()
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self.bg_processes = []
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atexit.register(self.kill_bg_processes)
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def __del__(self):
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self.kill_bg_processes()
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def _generate_script_magics(self):
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cell_magics = self.magics['cell']
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for name in self.script_magics:
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cell_magics[name] = self._make_script_magic(name)
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def _make_script_magic(self, name):
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"""make a named magic, that calls %%script with a particular program"""
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# expand to explicit path if necessary:
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script = self.script_paths.get(name, name)
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@magic_arguments.magic_arguments()
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@script_args
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def named_script_magic(line, cell):
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# if line, add it as cl-flags
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if line:
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line = "%s %s" % (script, line)
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else:
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line = script
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return self.shebang(line, cell)
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# write a basic docstring:
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named_script_magic.__doc__ = \
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"""%%{name} script magic
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Run cells with {script} in a subprocess.
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This is a shortcut for `%%script {script}`
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""".format(**locals())
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return named_script_magic
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@magic_arguments.magic_arguments()
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@script_args
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@cell_magic("script")
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@dec_safe_watcher
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def shebang(self, line, cell):
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"""Run a cell via a shell command
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The `%%script` line is like the #! line of script,
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specifying a program (bash, perl, ruby, etc.) with which to run.
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The rest of the cell is run by that program.
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Examples
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--------
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::
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In [1]: %%script bash
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...: for i in 1 2 3; do
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...: echo $i
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...: done
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1
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2
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3
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"""
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async def _handle_stream(stream, stream_arg, file_object):
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while True:
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line = (await stream.readline()).decode("utf8")
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if not line:
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break
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if stream_arg:
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self.shell.user_ns[stream_arg] = line
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else:
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file_object.write(line)
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file_object.flush()
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async def _stream_communicate(process, cell):
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process.stdin.write(cell)
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process.stdin.close()
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stdout_task = asyncio.create_task(
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_handle_stream(process.stdout, args.out, sys.stdout)
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)
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stderr_task = asyncio.create_task(
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_handle_stream(process.stderr, args.err, sys.stderr)
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)
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await asyncio.wait([stdout_task, stderr_task])
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await process.wait()
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if sys.platform.startswith("win"):
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asyncio.set_event_loop_policy(asyncio.WindowsProactorEventLoopPolicy())
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loop = asyncio.get_event_loop()
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argv = arg_split(line, posix=not sys.platform.startswith("win"))
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args, cmd = self.shebang.parser.parse_known_args(argv)
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try:
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p = loop.run_until_complete(
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asyncio.create_subprocess_exec(
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*cmd,
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stdout=asyncio.subprocess.PIPE,
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stderr=asyncio.subprocess.PIPE,
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stdin=asyncio.subprocess.PIPE,
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)
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)
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except OSError as e:
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if e.errno == errno.ENOENT:
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print("Couldn't find program: %r" % cmd[0])
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return
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else:
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raise
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if not cell.endswith('\n'):
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cell += '\n'
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cell = cell.encode('utf8', 'replace')
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if args.bg:
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self.bg_processes.append(p)
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self._gc_bg_processes()
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to_close = []
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if args.out:
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self.shell.user_ns[args.out] = p.stdout
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else:
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to_close.append(p.stdout)
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if args.err:
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self.shell.user_ns[args.err] = p.stderr
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else:
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to_close.append(p.stderr)
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self.job_manager.new(self._run_script, p, cell, to_close, daemon=True)
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if args.proc:
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self.shell.user_ns[args.proc] = p
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return
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try:
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loop.run_until_complete(_stream_communicate(p, cell))
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except KeyboardInterrupt:
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try:
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p.send_signal(signal.SIGINT)
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time.sleep(0.1)
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if p.returncode is not None:
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print("Process is interrupted.")
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return
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p.terminate()
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time.sleep(0.1)
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if p.returncode is not None:
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print("Process is terminated.")
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return
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p.kill()
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print("Process is killed.")
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except OSError:
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pass
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except Exception as e:
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print("Error while terminating subprocess (pid=%i): %s" % (p.pid, e))
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return
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if args.raise_error and p.returncode!=0:
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# If we get here and p.returncode is still None, we must have
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# killed it but not yet seen its return code. We don't wait for it,
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# in case it's stuck in uninterruptible sleep. -9 = SIGKILL
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rc = p.returncode or -9
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raise CalledProcessError(rc, cell)
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def _run_script(self, p, cell, to_close):
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"""callback for running the script in the background"""
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p.stdin.write(cell)
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p.stdin.close()
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for s in to_close:
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s.close()
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p.wait()
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@line_magic("killbgscripts")
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def killbgscripts(self, _nouse_=''):
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"""Kill all BG processes started by %%script and its family."""
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self.kill_bg_processes()
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print("All background processes were killed.")
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def kill_bg_processes(self):
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"""Kill all BG processes which are still running."""
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if not self.bg_processes:
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return
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for p in self.bg_processes:
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if p.returncode is None:
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try:
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p.send_signal(signal.SIGINT)
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except:
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pass
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time.sleep(0.1)
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self._gc_bg_processes()
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if not self.bg_processes:
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return
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for p in self.bg_processes:
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if p.returncode is None:
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try:
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p.terminate()
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except:
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pass
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time.sleep(0.1)
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self._gc_bg_processes()
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if not self.bg_processes:
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return
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for p in self.bg_processes:
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if p.returncode is None:
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try:
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p.kill()
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except:
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pass
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self._gc_bg_processes()
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def _gc_bg_processes(self):
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self.bg_processes = [p for p in self.bg_processes if p.returncode is None]
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