/usr/lib/python3/dist-packages/ipykernel/inprocess/blocking.py is in python3-ipykernel 4.8.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 | """ Implements a fully blocking kernel client.
Useful for test suites and blocking terminal interfaces.
"""
#-----------------------------------------------------------------------------
# Copyright (C) 2012 The IPython Development Team
#
# Distributed under the terms of the BSD License. The full license is in
# the file COPYING.txt, distributed as part of this software.
#-----------------------------------------------------------------------------
try:
from queue import Queue, Empty # Py 3
except ImportError:
from Queue import Queue, Empty # Py 2
# IPython imports
from IPython.utils.io import raw_print
from traitlets import Type
# Local imports
from .channels import (
InProcessChannel,
)
from .client import InProcessKernelClient
class BlockingInProcessChannel(InProcessChannel):
def __init__(self, *args, **kwds):
super(BlockingInProcessChannel, self).__init__(*args, **kwds)
self._in_queue = Queue()
def call_handlers(self, msg):
self._in_queue.put(msg)
def get_msg(self, block=True, timeout=None):
""" Gets a message if there is one that is ready. """
if timeout is None:
# Queue.get(timeout=None) has stupid uninteruptible
# behavior, so wait for a week instead
timeout = 604800
return self._in_queue.get(block, timeout)
def get_msgs(self):
""" Get all messages that are currently ready. """
msgs = []
while True:
try:
msgs.append(self.get_msg(block=False))
except Empty:
break
return msgs
def msg_ready(self):
""" Is there a message that has been received? """
return not self._in_queue.empty()
class BlockingInProcessStdInChannel(BlockingInProcessChannel):
def call_handlers(self, msg):
""" Overridden for the in-process channel.
This methods simply calls raw_input directly.
"""
msg_type = msg['header']['msg_type']
if msg_type == 'input_request':
_raw_input = self.client.kernel._sys_raw_input
prompt = msg['content']['prompt']
raw_print(prompt, end='')
self.client.input(_raw_input())
class BlockingInProcessKernelClient(InProcessKernelClient):
# The classes to use for the various channels.
shell_channel_class = Type(BlockingInProcessChannel)
iopub_channel_class = Type(BlockingInProcessChannel)
stdin_channel_class = Type(BlockingInProcessStdInChannel)
def wait_for_ready(self):
# Wait for kernel info reply on shell channel
while True:
msg = self.shell_channel.get_msg(block=True)
if msg['msg_type'] == 'kernel_info_reply':
self._handle_kernel_info_reply(msg)
break
# Flush IOPub channel
while True:
try:
msg = self.iopub_channel.get_msg(block=True, timeout=0.2)
print(msg['msg_type'])
except Empty:
break
|