|
|
""" Defines helper functions for creating kernel entry points and process
|
|
|
launchers.
|
|
|
"""
|
|
|
|
|
|
# Standard library imports.
|
|
|
import atexit
|
|
|
import os
|
|
|
import socket
|
|
|
from subprocess import Popen, PIPE
|
|
|
import sys
|
|
|
import tempfile
|
|
|
|
|
|
# System library imports
|
|
|
#from zmq.utils import jsonapi as json
|
|
|
from IPython.zmq import jsonapi as json
|
|
|
|
|
|
# IPython imports
|
|
|
from IPython.utils.localinterfaces import LOCALHOST
|
|
|
from IPython.utils.py3compat import bytes_to_str
|
|
|
|
|
|
# Local imports.
|
|
|
from parentpoller import ParentPollerWindows
|
|
|
|
|
|
def write_connection_file(fname=None, shell_port=0, iopub_port=0, stdin_port=0, hb_port=0,
|
|
|
ip=LOCALHOST, key=b''):
|
|
|
"""Generates a JSON config file, including the selection of random ports.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
|
|
|
fname : unicode
|
|
|
The path to the file to write
|
|
|
|
|
|
shell_port : int, optional
|
|
|
The port to use for XREP channel.
|
|
|
|
|
|
iopub_port : int, optional
|
|
|
The port to use for the SUB channel.
|
|
|
|
|
|
stdin_port : int, optional
|
|
|
The port to use for the REQ (raw input) channel.
|
|
|
|
|
|
hb_port : int, optional
|
|
|
The port to use for the hearbeat REP channel.
|
|
|
|
|
|
ip : str, optional
|
|
|
The ip address the kernel will bind to.
|
|
|
|
|
|
key : str, optional
|
|
|
The Session key used for HMAC authentication.
|
|
|
|
|
|
"""
|
|
|
# default to temporary connector file
|
|
|
if not fname:
|
|
|
fname = tempfile.mktemp('.json')
|
|
|
|
|
|
# Find open ports as necessary.
|
|
|
ports = []
|
|
|
ports_needed = int(shell_port <= 0) + int(iopub_port <= 0) + \
|
|
|
int(stdin_port <= 0) + int(hb_port <= 0)
|
|
|
for i in xrange(ports_needed):
|
|
|
sock = socket.socket()
|
|
|
sock.bind(('', 0))
|
|
|
ports.append(sock)
|
|
|
for i, sock in enumerate(ports):
|
|
|
port = sock.getsockname()[1]
|
|
|
sock.close()
|
|
|
ports[i] = port
|
|
|
if shell_port <= 0:
|
|
|
shell_port = ports.pop(0)
|
|
|
if iopub_port <= 0:
|
|
|
iopub_port = ports.pop(0)
|
|
|
if stdin_port <= 0:
|
|
|
stdin_port = ports.pop(0)
|
|
|
if hb_port <= 0:
|
|
|
hb_port = ports.pop(0)
|
|
|
|
|
|
cfg = dict( shell_port=shell_port,
|
|
|
iopub_port=iopub_port,
|
|
|
stdin_port=stdin_port,
|
|
|
hb_port=hb_port,
|
|
|
)
|
|
|
cfg['ip'] = ip
|
|
|
cfg['key'] = bytes_to_str(key)
|
|
|
|
|
|
with open(fname, 'wb') as f:
|
|
|
f.write(json.dumps(cfg, indent=2))
|
|
|
|
|
|
return fname, cfg
|
|
|
|
|
|
|
|
|
def base_launch_kernel(code, fname, stdin=None, stdout=None, stderr=None,
|
|
|
executable=None, independent=False, extra_arguments=[]):
|
|
|
""" Launches a localhost kernel, binding to the specified ports.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
code : str,
|
|
|
A string of Python code that imports and executes a kernel entry point.
|
|
|
|
|
|
stdin, stdout, stderr : optional (default None)
|
|
|
Standards streams, as defined in subprocess.Popen.
|
|
|
|
|
|
fname : unicode, optional
|
|
|
The JSON connector file, containing ip/port/hmac key information.
|
|
|
|
|
|
key : str, optional
|
|
|
The Session key used for HMAC authentication.
|
|
|
|
|
|
executable : str, optional (default sys.executable)
|
|
|
The Python executable to use for the kernel process.
|
|
|
|
|
|
independent : bool, optional (default False)
|
|
|
If set, the kernel process is guaranteed to survive if this process
|
|
|
dies. If not set, an effort is made to ensure that the kernel is killed
|
|
|
when this process dies. Note that in this case it is still good practice
|
|
|
to kill kernels manually before exiting.
|
|
|
|
|
|
extra_arguments = list, optional
|
|
|
A list of extra arguments to pass when executing the launch code.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
A tuple of form:
|
|
|
(kernel_process, shell_port, iopub_port, stdin_port, hb_port)
|
|
|
where kernel_process is a Popen object and the ports are integers.
|
|
|
"""
|
|
|
|
|
|
# Build the kernel launch command.
|
|
|
if executable is None:
|
|
|
executable = sys.executable
|
|
|
arguments = [ executable, '-c', code, '-f', fname ]
|
|
|
arguments.extend(extra_arguments)
|
|
|
|
|
|
# Popen will fail (sometimes with a deadlock) if stdin, stdout, and stderr
|
|
|
# are invalid. Unfortunately, there is in general no way to detect whether
|
|
|
# they are valid. The following two blocks redirect them to (temporary)
|
|
|
# pipes in certain important cases.
|
|
|
|
|
|
# If this process has been backgrounded, our stdin is invalid. Since there
|
|
|
# is no compelling reason for the kernel to inherit our stdin anyway, we'll
|
|
|
# place this one safe and always redirect.
|
|
|
redirect_in = True
|
|
|
_stdin = PIPE if stdin is None else stdin
|
|
|
|
|
|
# If this process in running on pythonw, we know that stdin, stdout, and
|
|
|
# stderr are all invalid.
|
|
|
redirect_out = sys.executable.endswith('pythonw.exe')
|
|
|
if redirect_out:
|
|
|
_stdout = PIPE if stdout is None else stdout
|
|
|
_stderr = PIPE if stderr is None else stderr
|
|
|
else:
|
|
|
_stdout, _stderr = stdout, stderr
|
|
|
|
|
|
# Spawn a kernel.
|
|
|
if sys.platform == 'win32':
|
|
|
# Create a Win32 event for interrupting the kernel.
|
|
|
interrupt_event = ParentPollerWindows.create_interrupt_event()
|
|
|
arguments += [ '--interrupt=%i'%interrupt_event ]
|
|
|
|
|
|
# If the kernel is running on pythonw and stdout/stderr are not been
|
|
|
# re-directed, it will crash when more than 4KB of data is written to
|
|
|
# stdout or stderr. This is a bug that has been with Python for a very
|
|
|
# long time; see http://bugs.python.org/issue706263.
|
|
|
# A cleaner solution to this problem would be to pass os.devnull to
|
|
|
# Popen directly. Unfortunately, that does not work.
|
|
|
if executable.endswith('pythonw.exe'):
|
|
|
if stdout is None:
|
|
|
arguments.append('--no-stdout')
|
|
|
if stderr is None:
|
|
|
arguments.append('--no-stderr')
|
|
|
|
|
|
# Launch the kernel process.
|
|
|
if independent:
|
|
|
proc = Popen(arguments,
|
|
|
creationflags=512, # CREATE_NEW_PROCESS_GROUP
|
|
|
stdin=_stdin, stdout=_stdout, stderr=_stderr)
|
|
|
else:
|
|
|
from _subprocess import DuplicateHandle, GetCurrentProcess, \
|
|
|
DUPLICATE_SAME_ACCESS
|
|
|
pid = GetCurrentProcess()
|
|
|
handle = DuplicateHandle(pid, pid, pid, 0,
|
|
|
True, # Inheritable by new processes.
|
|
|
DUPLICATE_SAME_ACCESS)
|
|
|
proc = Popen(arguments + ['--parent=%i'%int(handle)],
|
|
|
stdin=_stdin, stdout=_stdout, stderr=_stderr)
|
|
|
|
|
|
# Attach the interrupt event to the Popen objet so it can be used later.
|
|
|
proc.win32_interrupt_event = interrupt_event
|
|
|
|
|
|
else:
|
|
|
if independent:
|
|
|
proc = Popen(arguments, preexec_fn=lambda: os.setsid(),
|
|
|
stdin=_stdin, stdout=_stdout, stderr=_stderr)
|
|
|
else:
|
|
|
proc = Popen(arguments + ['--parent=1'],
|
|
|
stdin=_stdin, stdout=_stdout, stderr=_stderr)
|
|
|
|
|
|
# Clean up pipes created to work around Popen bug.
|
|
|
if redirect_in:
|
|
|
if stdin is None:
|
|
|
proc.stdin.close()
|
|
|
if redirect_out:
|
|
|
if stdout is None:
|
|
|
proc.stdout.close()
|
|
|
if stderr is None:
|
|
|
proc.stderr.close()
|
|
|
|
|
|
return proc
|
|
|
|
